JPH0725320U - Fastening pin structure - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to fasten connecting members such as segments with one touch. [Structure] A base portion 2a is provided on a joint surface portion 1a of a coupling member 1 on one side.
Is embedded through the retaining means 4 and the tip 2b is protruded from the joint surface portion 1a by a required length, and the pin 2 is embedded in the joint surface portion 1b of the coupling member 1 on the other side through the retainer means 6. 2 includes a fitting member 3 into which the tip 2b of the pin 2 is formed in a tapered shape and an engagement groove 5 is formed in the outer peripheral surface direction.
Has a retaining ring 8 made of an elastic material, which is fitted and held in an inner circumferential groove 7 formed in the circumferential direction of the inner surface thereof and is partially separated, and the pin 2 is inserted into the fitting member 3. When retaining ring 8
Is fitted into the engaging groove 5 and is prevented from coming off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fastening pin structure used to connect connecting members such as segments to each other.

[0002]

[Prior art]

 When constructing a road for various purposes in the ground, a segment formed of concrete or the like should be constructed along the inner wall of the hole excavated by the shield, assembled in a cylindrical shape, and continued in sequence. There is a tunnel construction method.

A segment used in this type of construction method has a shape divided into a plurality (7 divisions in FIG. 5) in the circumferential direction as illustrated in FIG. 6, and by connecting these in the circumferential direction. Assembling into a circular shape, and then assembling the tunnels in the same manner one after the other to construct a tunnel. The segments a and a are connected to each other by connecting the segments a and a in the bolt boxes b and b formed at the joints. Are fastened with bolts c, c, and the front and rear segments are also fastened with bolts.

[0004]

[Problems to be solved by the device]

 However, connecting the bolts between the segments is an on-site work, which requires a lot of man-hours, requires a lot of time for the fastening work, and requires extra work such as filling the bolts with cement so that the fastening does not loosen. I'm not good at sex. This applies not only to segments but also to concrete block loading.

In view of this, the present invention has an object to provide a fastening pin structure capable of fastening the coupling members with one-touch and enabling a firm coupling that does not come off after fastening.

[0006]

[Means for Solving the Problems] As means for solving the problems of the above-mentioned conventional technique, the present invention provides a base portion embedded in a joint surface portion of a coupling member on one side through a retaining means, and a tip end of the joint portion. It consists of a pin protruding a required length from the surface portion and a fitting member that is embedded in the joining surface portion of the coupling member on the other side through the retaining means and into which the pin is inserted.The pin has a tapered tip. And a fitting groove is formed in the outer peripheral surface direction, and the fitting member is made of an elastic material fitted and held in the inner peripheral groove formed in the inner surface circumferential direction and partly separated. A retaining ring is provided, and when the pin is inserted into the fitting member, the retaining ring fits into the engaging groove and is retained.

According to a second aspect of the present invention, in order to enhance the retaining function of the retaining ring, the outer peripheral surface of the retaining ring on the opening end side of the fitting member is formed into a taper surface, and the peripheral edge of the inner peripheral groove of the fitting member is formed. The tapered surface is in pressure contact with each other to perform a wedge action. Further, in claim 3, a serrated uneven surface is used instead of the engaging groove of the pin.

[0008]

[Action]

 When inserting the pin into the mating member of the mating mating member when the mating member is mated, the retaining ring is pushed open by the pin, and the retaining ring expands in the inner peripheral groove of the mating member. The inner peripheral surface of the pin engages with the engaging groove of the pin, and the retaining ring is prevented from being disengaged by the peripheral edge of the inner peripheral groove of the fitting member against the force in the disengaging direction of the pin to prevent the pin from slipping out. It

[0009]

【Example】

 The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 shows a cross section of an embodiment of a fastening pin structure according to the present invention in a coupled state, and FIGS. 2 (A) and 2 (B) show a cross section in a state before coupling.

In FIG. 1, reference numerals 1 and 1 denote a part of a joining member such as a segment. A pin 2 is implanted in a joining surface portion 1a of the joining member 1 on one side, and a joining surface portion of the joining member 1 on the other side. A fitting member 3 is embedded in 1b.

The base 2a of the pin 2 is embedded in the coupling member 2 via the retaining means 4 and the tip 2b is tapered so as to be tapered. The engaging groove 5 is formed in the circumferential direction.

In the drawing, the retaining means 4 has a large number of projections 4a, 4a ... Protruding in the circumferential direction on the outer periphery of the base 2a of the pin 2, and by embedding these projections 4a, 4a. It is designed to be fixed immovably in the axial direction.

The fitting member 3 has a bottomed tubular shape with one end open, and is embedded via a retaining means 6 including projections 6 a, 6 b ... Like the pin 2. A retaining ring 8 made of an elastic material as shown in FIGS. 3A and 3B is fitted and held in an inner peripheral groove 7 formed in the inner peripheral direction of the fitting member 3. A part 8a of the pin 2 in the circumferential direction is separated, and is formed so as to keep a diameter smaller than the outer diameter of the pin 2 at all times. The retaining ring 8 retained in the inner peripheral groove 7 and the engaging groove 5 of the pin 2 are in a positional relationship that aligns when the joint surface portions 1a and 1b of the coupling members 1 and 1 are brought into contact with each other. It

An outer peripheral surface of the retaining ring 8 on the opening end side of the fitting member 3 is formed into a tapered surface 9, and the tapered surface 9 is pressed against the peripheral edge 7 a of the inner peripheral groove 7 of the fitting member 3. The wedge action is used to enhance the retaining effect.

In FIG. 4, the engagement groove 5 formed on the outer peripheral surface of the pin 2 has a plurality of groove structures with saw-toothed concavities and convexities, and the inner periphery of the retaining ring 8 engages with this to maintain a stationary state. This is a modified example.

In any case, when the pin 2 is inserted into the mating member 3 of the mating coupling member 1 when the coupling members 1 and 1 are coupled, the tip 2b of the pin 2 causes the retaining ring 8 to expand. However, the retaining ring 8 expands in the inner peripheral groove 7 of the fitting member 3. When the pin 2 is further advanced, the inner circumference of the retaining ring 8 engages with the engaging groove 5 of the pin 2, and the tapered surface 9 of the retaining ring 8 is inward against the force of the pin 2 in the removing direction. The peripheral edge 7a of the circumferential groove 7 is pressed against and prevented from coming off.

FIG. 5 shows an application example of the present invention, in which the pin 2 and the fitting member 3 according to the present invention are provided on the joint surface portion of the segment 10 which can be assembled into a circular shape by fitting.

The segments 10 are formed at both ends in the circumferential direction of the segment body 11 which is curved with a predetermined curvature, and each half width of the segment body 11 is centered on a radial line from the center of curvature of the segment body 11. Slanting contact surfaces 12, 12 inclining in opposite directions to each other at equal angles, and a notch portion 14 formed on the outer circumferential edge on the side where the projecting portions 13, 13 from which both ends of the segment body 11 project are present. And a projecting edge 15 formed on the outer circumferential edge on the opposite side and fitted into the cutout portion, and the side surfaces of the projecting portions 13, 13 at the circumferential end portions of the segment body 11 serve as the joint surface portion 1a. Pins 2 and 2 are projectingly provided on this, and the surface on the opposite side of the projecting portions 13 and 13 serves as a joining surface portion 1b, and fitting members 3 and 3 are embedded therein.

Therefore, the segments 10, 10, ... Are arranged along the inner wall surface of the hole excavated in the ground, and the inclined contact surfaces 12, 12 of the projecting portions 13, 13 at both ends in the circumferential direction thereof and the adjacent segment. By the contact with the inclined contact surfaces 12, 12 on the side where the protruding portions 13, 13 are not present, they are fixedly connected in the axial direction of the hole. At this time, the pin 2 and the fitting member 3 are fitted together, and the cutout portion 14 and the projecting edge 15 are fitted together in this order so that they are assembled in an annular shape and fitted into the pin 2. As described above, the member 3 is fastened without being pulled out just by inserting it, and therefore it is not necessary to intervene in work such as bolt tightening.

[0021]

[Effect of device]

 As described above, according to the present invention, at the time of connecting a connecting member such as a segment, the pin can be inserted into the fitting member without being pulled out, and the bolt tightening work is no longer required as in the prior art. Workability can be significantly improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a fastening state showing an embodiment of a fastening pin structure according to the present invention.

2A and 2B are exploded cross-sectional views of the same.

3A and 3B are a front view and a side view of the retaining ring in FIG.

FIG. 4 is a sectional view of a fastening state according to another embodiment of the present invention.

FIG. 5 is a perspective view showing a segment as a coupling member to which the present invention is applied.

FIG. 6 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coupling member 2 Pin 3 Fitting member 4,6 Detachment prevention means 5 Engagement groove 7 Inner peripheral groove 8 Detention ring 9 Tapered surface 10 Segment 11 Segment body 12 Inclined contact surface 13 Projection part 14 Notch 15 Projection edge

Claims (3)

[Scope of utility model registration request] 1. A pin having a base portion embedded in a joint surface portion of a coupling member on one side through a retaining means and a tip protruding from the joint surface portion by a required length, and a retaining means on a joint surface portion of a coupling member on the other side. And a fitting member into which the pin is inserted, the tip of the pin being formed in a tapered shape and an engaging groove being formed in the outer peripheral surface direction, and the fitting member is The retaining ring is made of an elastic material that is fitted and retained in an inner circumferential groove formed in the inner circumferential direction and is partially separated. When the pin is inserted into the fitting member, the retaining ring is engaged. A fastening pin structure characterized by being fitted into a mating groove so as to be retained. 2. An outer peripheral surface of the retaining ring on the opening end side of the fitting member is formed into a taper surface, and the taper surface is pressed against the peripheral edge of the inner peripheral groove of the fitting member to be retained. The fastening pin structure according to claim 1. 3. A serrated engagement groove is formed on the outer peripheral surface of the pin at a position corresponding to the retaining ring.
Fastening pin structure described.