JPS63122897A - Method of connecting concrete segment - 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] [Industrial Application Field] The present invention relates to a method for connecting concrete segments, which is often used when constructing railway tunnels, underground passages, or sewerage systems.

[Conventional technology] Conventionally, when constructing tunnels, sewers, etc. horizontally, a plurality of arcuate plate-shaped concrete segments that form a cylindrical shape when connected are used, and these are successively connected in a hole drilled underground. It is used to build tunnels and sewer walls. To connect concrete segments, first butt the joint fittings with bolt holes buried in the opposing joint end faces of the segments, then take out the bolts and nuts one by one from a tool box, etc., and connect them to the joint fittings. The method used is to bring the joints together and fasten the fittings together using bolts and nuts.

[Problems to be Solved by the Invention] However, when connecting fittings together using bolts and nuts, the bolts and nuts are removed during the process of taking them out and bringing them to the fitting, or during the tightening stage. It was inefficient because nuts were easy to drop and could get caught and lost. Moreover, for this reason, the management of the number n of bolts and nuts has become inaccurate.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and the present invention has been made in order to solve the above-mentioned problems.
A bolt is attached to the inner surface of the flange plate facing the bolt hole of one of the joint fittings, and a fitting part that holds the head of this bolt and a material that is integrally provided in this fitting part and covers the threaded part of the bolt and have plasticity. When the flange plate facing the bolt hole of the other joint fitting is temporarily fixed in advance with a temporary fixing cap having a cylindrical part formed by the cylindrical part and a flange part for adhering the cylindrical part to the flange plate, A nut is temporarily fixed on the inner surface with a temporary fixing cap that has a fitting part that holds the whole nut and a flange part that sticks this fitting part to the flange plate, and when connecting, After aligning the bolt holes of the joint fittings, the bolt temporarily fastened by the cap is pushed in to break the cylindrical part of the bolt temporary fastening cap, and this bolt is fastened to the nut, thereby separating the joint fittings from each other. The feature is that it connects.

[Operation] When the bolt is pushed in while it is temporarily secured by the cap, the fitting part moves and the cylindrical part is destroyed, and as the bolt is fastened to the nut, the cap temporarily securing the nut is pushed into the joint. It comes off from the flange plate of the metal fittings.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

The symbol l in Fig. 1 is a concrete segment, and this segment! A plurality of these are connected in the circumferential direction and the axial direction, and have an arc shape that curves at a constant curvature so that the whole becomes cylindrical.

On the joint end surfaces around this segment 1, there are an appropriate number of joints that serve as joints for each segment (in the example shown, three on the upper and lower end surfaces, that is, in the axial direction, and two on the left and right end surfaces, that is, in the circumferential direction).
2) of joint fittings 2 are buried. Bolt holes 3 are bored in the flange plate 2a of this joint fitting 2. Further, inside the joint fitting 2, connecting bolts and nuts are arranged, and a space 4 is provided as a work space for performing the fastening work.

Below, each time the above-mentioned joint fittings 2 are connected,
A method for connecting segments l will be explained step by step.

First, while this segment 1 is being stored in Moe's warehouse or the like where it will be transported to the construction site, bolts 5 are inserted into the joint fittings embedded in the joining end surface on one side of the circumferential direction and the axial direction of the segment 1. In addition, a nut 6 is temporarily fastened to a joint fitting embedded in the other joint end surface.

To temporarily fasten the bolt 5, a bolt temporary fastening tab 7 as shown in FIGS. 2 and 3 is used. This cap 7 is
A fitting part 8 that is formed along the shape of the head 5a of the bolt 5 and has a protrusion 8a on the inner surface that fits into the head 5a of the bolt 5.
A cylindrical part 9 is formed in a hollow conical shape from a plastic material such as Plus Deck and covers the threaded part 5b of the bolt 5. It consists of a flange portion lO to be attached. Note that the flange portion IO is made of a plastic material such as foamed polyethylene, and a double-sided tape IOa is pasted on the inner surface.

To temporarily tighten the bolt 5, insert the bolt 5 into the head 5.
a into the cap 7, and fit the bolt head 5a into the one-piece joint 8 of the cap 7. At this time, the protrusion 8a on the inner surface of the fitting part 8 fits into the end surface of the bolt head 5a, and acts to prevent the bolt 5 from falling off.

Next, the cap 7 with the bolt 5 fitted inside like this
To set the cap 7 on the fitting 2, insert the tip of the threaded part 51) of the cap 7 into the bolt hole 3 of the fitting 2, and insert the flange 10 of the cap 7 into the flange plate of the fitting 2. Attach to the inner surface of 2a using double-sided tape LOA. As a result, the bolt 5 is temporarily fixed to the joint fitting 2.

On the other hand, for temporarily fixing the nut 6, a nut temporary fixing cap 11 is used as shown in FIGS. 4 and 5.

The cap 11 is made of a material having plasticity such as plastic and is formed to follow the outer shape of the nut 6, so that the inner surface of the nut 6 facing the outer periphery of the washer 6a is fitted with the washer 6a. A circumferential protruding strip (one thorn joint portion) 12 is formed to hold the entire portion 6. Further, on the outer periphery of the lower edge of this cap 11, a flange portion 13 made of a material having rT plasticity such as foamed polyethylene is attached, as in the case of the bolt temporary soil cap 7, and on its inner surface. is attached with double-sided tape 13a.

Using such a cap 11, the nut 6 is attached to the fitting 2.
To temporarily fasten the nut 6 to the inside of the cap 11, the peripheral protrusion 12 is engaged with the outer periphery of the washer 6a. The circumferential protrusion 12 engages with the circumferential surface of the washer 63 and acts to prevent the nut 6 from falling off.

In this way, in order to set the cap 11 with the nut 6 fitted inside to the fitting 2, the bottom surface of the washer 6a should be aligned so that the threaded hole of the nut 6 is coaxial with the port I/hole 3 of the fitting 2. At the same time as fitting the inner surface of the flange plate 2a of the fitting 2, the cap 1! The flange portion 13 is adhered to the flange plate 2a with double-sided tape 13a. As a result, the nut a is temporarily fixed to the joint fitting 2.

The process of assembling the segment I in which the bolts 5 and nuts 6 are temporarily fastened to each joint fitting 2 will be described below.

First, in the joint end surfaces in the circumferential direction, Pol l-5h At the same time, the bolt holes 3 of both joint fittings 2 are aligned with each other at tl-L to form continuous bolt holes 3.

Push the bolt 5 temporarily fixed by the bolt temporary fixing cap 7 into the nut Ofllll+ together with the cap 7, destroy the cylindrical part 9 of the cap 7, and disengage the protrusion 8a from the end surface of the bolt head 5a. In addition to this, insert the threaded part 5b into the bolt holes 3 and 3, and insert it from the outside of the cap 7!・Pinch the head 5a and slightly screw into the nut 6. Thereafter, the bolt 5 is screwed into the nut 6 using a tool such as a spanner, and the bolt 5 is fastened. At this time, the bolt 6 is screwed in and the adhesive of the double-sided tape 13a is peeled off from the nut temporary fixing cap 11 on the nut 6 side.
It comes off from the flange plate 2a.

By repeating the above operations and sequentially connecting the segments 1 in the circumferential direction to form a cylindrical segment unit 14 as shown in FIG. 6, and further connecting a plurality of these segment units 14 in the axial direction, The cylindrical hand 1, which will become the wall of a tunnel or underpass, is completed.

According to the two-leg method, the bolts 5 and nuts 6 are attached to the fitting 2 in advance with their respective temporary fixing caps 7 and 1.
! This eliminates the need to prepare the bolts 5 and nuts 6 at the stage of actually connecting them, and prevents the bolts 5 and nuts 6 from falling or being lost due to work errors. be able to.

In addition, the caps 7.11, which are unnecessary when tightening the bolts 5 and nuts 6, are destroyed at the same time as the tightening operation.
Alternatively, since the adhesive can be peeled off, the fastening work will not be hindered.

As described above, in addition to being able to accurately and efficiently manage the number of bolts 5 and nuts 6, it is also possible to use an automatic assembly device such as a robot.

FIGS. 7 and 8 show other embodiments of the bolt temporary soil cap.

The bolt 20 in these embodiments has a washer 20b under the head 20a, and the cap is intended for these types of bolts, and the cap is designed to fit into the head 5a of the bolt 5 of Embodiment 1. 8 was transformed.

That is, the cap 21 shown in FIG. 7 is open at the top so that the head 20a of the bolt 20 is exposed.
・It is the fitting part 21a of the head 20a, and the washer 20b
is attached to the cap 21 with an adhesive. The cap 22 shown in FIG. 8 is a modification of the cap 21 shown in FIG. 7, and has a protrusion 22a formed on the inner surface of the opening as a fitting portion to grip the washer 20b together with the periphery of the opening.

The caps 21, 22 as described above also provide the same effects as the caps of the previously described embodiments.

[Effects of the Invention] As explained above, according to the method for connecting concrete segments of the present invention, bolts and nuts are temporarily fixed to the joint fittings in advance by their respective temporary fixing caps. In addition, it is possible to avoid the trouble of preparing bolts and nuts at the stage of actually connecting them, and to prevent bolts and nuts from falling or being lost due to work errors.

Further, since the caps that become unnecessary when bolts and nuts are fastened are destroyed or the bone attachments are peeled off at the same time as the fastening work, there is no problem with the fastening work.

Moreover, these provide the effect that the number of bolts and nuts can be managed accurately and efficiently.

[Brief explanation of the drawing]

1 to 6 are views showing one embodiment of the present invention, in which FIG. 1 is a perspective view of a concrete segment, and FIG. 2 is a side view showing a state in which a bolt is temporarily fixed to a joint fitting with a cap. Fig. 3 is a partially cutaway perspective view, Fig. 4 is a side view of the nut temporarily secured to the fitting with a cap, Fig. 5 is a partially cutaway perspective view, and Fig. 6 is a concrete FIGS. 7 and 8 are side views showing other embodiments of the cap, respectively. 1... Concrete segment, 2...
・Joint fittings, 2a...Flange plate, 3...
...Bolt hole, 5...Bolt, 5a...
・Port head, 5b...Threaded part of bolt,
6... Nut, 7... Bolt temporary fixing cap, 8... Fitting part, 9... Cylindrical part, lO... Flange part, 11...Cap for temporarily fixing the nut, 12...Peripheral protrusion (fitting part), 13...Flange part. Applicant Ishikawajima Kenzai Kogyo Co., Ltd. Ishikawajima Harima Heavy Industries Co., Ltd. Figure 2

Claims (1)

[Claims] When connecting concrete segments by fastening joint fittings with bolt holes embedded in both joint end faces of concrete segments to be joined together with bolts and nuts, before connection, among the joint fittings facing each other, A bolt is attached to the inner surface of the flange plate facing the bolt hole of one of the joint fittings, and a fitting part that holds the head of this bolt and a material that is integrally provided in this fitting part and covers the threaded part of the bolt and have plasticity. It is temporarily fixed in advance with a temporary fixing cap that has a cylindrical part formed by the cylindrical part and a flange part that adheres this cylindrical part to the flange plate, and the inner surface of the flange plate facing the bolt hole of the other joint fitting is temporarily fixed in advance. The nut is temporarily fixed with a temporary fixing cap that has a fitting part that holds the entire nut and a flange part that adheres this fitting part to the flange plate, and when connecting, the fitting After aligning the bolt holes, the cylindrical part of the bolt temporary fixing cap is broken by pushing in the bolt temporarily fixed by the cap, and the two fittings are connected by tightening this bolt to the nut. A method for connecting concrete segments, characterized in that: