JP7281125B2 - Insertion type joint of precast member including RC segment and precast member including RC segment provided with the same - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insertion type joint for connecting precast members including two adjacent RC segments, as an example, and a precast member including RC segments having the same.

The shield construction method is often used for constructing tunnels. This shield construction method is a construction method in which a borehole is excavated underground by a shield machine, and a plurality of segments are assembled on the inner peripheral surface of the borehole to construct a cylindrical wall. Here, the segments are mainly arc plate-shaped RC segments (hereinafter simply referred to as segments) made of reinforced concrete and rectangular in plan view, and these segments are connected in the circumferential direction to form a segment ring. The entire tunnel is constructed by connecting the segment rings in the axial direction of the tunnel according to the excavation of the shield machine.

By the way, the connection between the segments adjacent in the circumferential direction and the connection between the segments adjacent in the tunnel axial direction have conventionally been performed by bolts. Specifically, in the vicinity of the joint surfaces of the segments, a joint plate having holes communicating with each other with the joint surfaces of adjacent segments in contact with each other is embedded, and bolts are inserted into the holes of the joint plates. The segments were connected by inserting the bolt and tightening a nut on the bolt. Alternatively, an insert fitting, which is a nut member, is embedded in each of the adjacent segments, and bolts passing through the adjacent segments are fastened to connect the segments.

However, according to the above-described conventional connection structure, there is a problem in that it requires a lot of time and labor to connect the segments due to the extremely complicated work involved, and that automation using a robot or the like is difficult.

Therefore, for example, Patent Literatures 1 and 2 propose segment joints that can easily and reliably connect segments in one pass.

That is, in Patent Documents 1 and 2, a joint (piece-to-piece joint) for connecting segments in the circumferential direction is composed of a male joint provided on one of the adjacent segments and a female joint provided on the other segment. There has been proposed a slide lock type that is used. Here, the male joint consists of a bolt, a base plate, a cap nut, a flat washer, a coned disc spring, etc., set up on the joint surface of one segment, and the female joint has a bolt planted in one segment, It is composed of a locking member embedded in a portion corresponding to the bolt on the joint surface of the other segment, a locking plate for fixing this, and the like.

In the slide lock type joint (piece-to-piece joint) composed of a male joint and a female joint as described above, the head of the bolt of the male joint provided on one segment is attached to the joint surface of the other segment. While being inserted into the formed recess, one segment is slid relative to the other segment, and the head of the bolt is engaged with the locking groove formed in the locking member of the female joint provided on the other segment. The mating circumferentially connects adjacent segments.

On the other hand, as joints (ring-to-ring joints) that connect the segments of adjacent segment rings in the tunnel axial direction, there are a male joint provided at the joint of one segment and a female joint provided at the joint of the other segment. An insertion type is proposed. Here, the male joint is composed of a rod member erected on the joint surface of one segment, a base member for fixing it, a cap nut, etc., and the female joint is a sleeve embedded in the joint portion of the other segment. (holder metal fitting) and wedge material (backup metal fitting).

In the insertion type joint (inter-ring joint) composed of the male joint and the female joint as described above, the rod member of the male joint provided on one segment is replaced by the rod member of the female joint provided on the other segment. By inserting it into the sleeve (holder metal fitting), the rod member engages with the wedge member (backup member) in the sleeve, and the frictional force generated between them connects both segment rings in the tunnel axial direction. In addition, saw teeth (notches) are formed on the outer periphery of the rod member to increase the frictional force.

JP-A-2000-054795 JP 2006-266024 A

However, the segment joints proposed in Patent Documents 1 and 2 have a problem that the structure is complicated, the number of parts is large, and the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an inexpensive insertion type joint capable of reliably connecting adjacent segments with a simple structure, and a segment having the same. . The insertion type joint of the present invention can be used not only for segments but also for joints of large precast members such as culverts and pavements. In the following description, RC segments (hereinafter also referred to as segments) will be described as representative examples of precast members to which the present invention can be applied.

In order to achieve the above object, the invention described in claim 1 is an insertion type joint for connecting two adjacent segments, comprising a sleeve embedded in the joint of one segment, and the sleeve A female joint provided with two parallel spring plates crossing in the direction perpendicular to the axis, and a protruding position corresponding to the female member on the joint surface of the other segment, and the two spring plates of the female joint at the tip thereof. a male member comprising a pin member having a head formed thereon with an outer diameter greater than the distance between said pin members, said pin member of said male joint being inserted into said sleeve of said female joint, said pin member head It is characterized in that both segments are connected by spreading the spring plate by the portion and passing the head portion through the spring plate.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, a tapered surface in the shape of a tapered truncated cone is formed at the tip of the head portion of the pin member.

The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, a rubber seal is attached to a portion of each of the spring plates protruding outside the sleeve.

In the segment according to the invention of claim 4, the male joint and the female joint of the insertion type joint according to any one of claims 1 to 3 or the Either one of the male joint and the female joint is provided.

According to claim 5, the segment is made of concrete, and the leaf spring is attached to an anchor buried inside.

According to the first aspect of the invention, the male joint of the insertion type joint can be made up of only the pin member, and the female joint can be made up of only the sleeve and the spring plate, so that the structure of the insertion type joint is simplified. cost reduction. Then, the pin member of the male joint is inserted into the sleeve of the female joint, the spring plate is spread by the head of the pin member, and the head is passed through the spring plate. It is possible to connect to , automation using a robot or the like is possible, and work efficiency can be improved and labor can be saved.

According to the second aspect of the invention, since the tip of the head portion of the pin member is formed with a truncated conical tapered surface, the head portion can be easily inserted and fitted between the two spring plates. As the head passes, the two spring plates are spread apart to allow the head to pass.

According to the third aspect of the invention, the rubber seal can prevent concrete that has not yet solidified from entering the sleeve through the insertion hole, and can also prevent the spring plate from being displaced. The purpose of the rubber seal is to prevent intrusion of concrete and displacement of the spring plate, as well as to facilitate elastic deformation of the spring plate without being restrained by concrete when the male pin member is inserted.

According to the fourth aspect of the invention, the pin member of the insertion type joint is inserted into the sleeve by sliding one segment relative to the other segment until the joint surfaces of the two adjacent segments come into contact with each other. Since the head of the pin member is engaged with the two spring plates, both segments can be easily and reliably connected in one pass.

According to the fifth aspect of the invention, the pin member is securely and firmly attached to the segment by the reinforcing anchor embedded in the reinforced concrete segment (RC segment).

FIG. 4 is a partial perspective view showing a segment connecting operation according to the present invention; 1 is a partially broken plan view of a segment according to the present invention; FIG. FIG. 3 is a cross-sectional view taken along line AA of FIG. 2; FIG. 4 is an enlarged detailed view of a B portion of FIG. 3; Fig. 2 is a perspective view of a male joint of a slide lock type joint; FIG. 4 is an enlarged detailed view of a C portion of FIG. 3; Fig. 2 is a perspective view of a female joint of a slide lock type joint; FIG. 3 is an enlarged detailed view of a D portion of FIG. 2; FIG. 9 is an enlarged cross-sectional view taken along line EE of FIG. 8; FIG. 3 is an enlarged detailed view of a portion F of FIG. 2; 11 is an enlarged cross-sectional view along line GG of FIG. 10; FIG. 12 is an enlarged cross-sectional view taken along line HH of FIG. 11; FIG. 4(a) to 4(c) are partial plan views showing the procedure for connecting segments in the circumferential direction by a slide lock type joint in the order of steps. FIG. FIG. 13(c) is an enlarged cross-sectional view taken along the line II. 4(a) to 4(c) are partial side cross-sectional views showing steps for connecting segments in the tunnel axial direction by an insertion type joint according to the present invention. FIG. 15B is an enlarged cross-sectional view taken along line JJ of FIG. 15(b);

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial perspective view showing the operation of connecting segments according to the present invention. In the figure, when constructing a tunnel by the shield construction method, a plurality of segments are assembled on the inner peripheral surface of an excavation hole to form a cylindrical wall. It shows the state of construction.

In FIG. 1, 100 is a cement ring already assembled by connecting a plurality of segments 101 over the entire circumference. , toward the front of FIG. 1), the next segmented ring (not shown) is assembled by connecting a plurality of segments 1 (1A) in the circumferential direction and the tunnel axial direction.

Here, the configuration of segment 1 will be described with reference to FIGS. 2 and 3. FIG.

2 is a partially broken plan view of a segment according to the present invention, and FIG. 3 is a cross-sectional view taken along line AA of FIG. Rectangular joint surfaces 1a and 1b on the short sides of both ends in the circumferential direction of other segments (segment 1A shown in FIG. 1 and a segment not shown) which are formed into arc-shaped plates and which are adjacent in the circumferential direction. A male joint 11 and a female joint 12 constituting the slide lock type joint 10 according to the present invention are provided at two positions in the width direction (two upper and lower positions in FIG. 2), respectively. Specifically, a male joint 11 and a female joint 12 are provided at two locations (top and bottom in FIG. 2) on the joint surface 1a (the joint surface with the segment 1A shown in FIG. 1) on one side (the left side in FIG. 2) of the segment 1. A female joint 12 and a male joint 11 are provided at two locations (top and bottom in FIG. 2) on the other joint surface 1b (on the right side in FIG. 2). That is, on the joint surfaces 1a and 1b of the segment 1, the male joints 11 and the female joints 12 are alternately provided in the tunnel axial direction (vertical direction in FIG. 2).

Each of the male joints 11 and each of the female joints 12 is attached to the ends of reinforcing anchors 2 and 3 which are embedded in the segment 1 and are U-shaped in plan view. Here, each of the anchors 2 and 3 is embedded in two stages (top and bottom in FIG. 3) in the thickness direction of the segment 1 .

In this embodiment, the male joints 11 and the female joints 12 are alternately provided on the joint surfaces 1a and 1b of the segment 1. 12) may be provided, and female joints 12 (or male joints 11) may be provided at two locations on the other joint surface 1b. It can be.

Here, the details of the configuration of the male joint 11 will be described with reference to FIGS. 4 and 5. FIG.

4 is an enlarged detailed view of the B portion of FIG. 3, and FIG. 5 is a perspective view of the male joint. The male joint 11 is made of an I-shaped member, specifically an I-shaped steel 11A. As shown in FIG. 5, the I-shaped steel 11A has a thin central web portion 11a and flange portions 11b at both longitudinal ends of the web portion 11a. It is set larger than the width b2 (b1>b2). As shown in FIG. 4, the I-shaped steel 11A that constitutes the male joint 11 is partly embedded in the segment 1, and the remaining tip protrudes from the joining surface 1b (1a). Here, as shown in FIG. 5, the I-shaped steel 11A is formed by stacking a plurality of (three in the illustrated example) punched pieces 11A1 obtained by punching a steel plate into an I-shape, and then welding these punched pieces 11A1. By doing so, the male joint 11 (I-shaped steel 11A) having a predetermined thickness can be manufactured easily and inexpensively.

Next, details of the configuration of the female joint 12 will be described with reference to FIGS. 6 and 7. FIG.

6 is an enlarged detailed view of the C part of FIG. 3, and FIG. 7 is a perspective view of the female joint. It is configured by combining two shaped steels 11A. That is, the V-shaped member constituting the female joint 12 is formed in a V shape by preparing two I-shaped steels 11A shown in FIG. there is Here, in the female joint (V-shaped member) 12, the distance L between each flange portion 11b on the open side of the two I-shaped steels 11A is more than the width b2 (see FIG. 5) of the web portion 11a of the I-shaped steel 11A. is also set slightly large (L>b2). In addition, the female joint (V-shaped member) 12 has a V-shaped space S surrounded by two I-shaped steels 11A. It is set slightly larger than the width b1 of the flange portion 11b of the shaped steel 11A (W>b1).

As shown in FIG. 6, the female joint 12 is entirely embedded in the segment 1, but as shown in FIG. is formed with a rectangular recess 4 for receiving the tip of the male joint 11 (I-shaped steel 11A).

On the other hand, as shown in FIG. 2, the length of the joint surface (long side side joint surface) 1c of the segment 1 with another segment 101 (see FIG. 1) adjacent in the tunnel axial direction and the joint surface 1d on the opposite side thereof is Male joints 21 and female joints 22 constituting the insertion type joint 20 according to the present invention are respectively provided at three positions in the longitudinal direction (the left and right direction in FIG. 2) (three positions in the lengthwise center and on the left and right). there is

Here, the details of the configuration of the male joint 21 that constitutes the insertion type joint 20 will be described with reference to FIGS. 8 and 9. FIG.

8 is an enlarged detailed view of the D portion of FIG. 2, and FIG. 9 is an enlarged sectional view of the EE line of FIG. The tip portion of the pin member 23 protrudes from the joint surface 1c of the segment 1 by a predetermined length. A male screw 23a is engraved at the rear end of the portion of the pin member 23 embedded in the segment 1, and the male screw 23a is embedded in the segment 1 at the tip of the anchor 5 for reinforcement. The pin member 23 is firmly attached to the anchor 5 by being screwed into the female screw 5a formed in the hole.

A truncated cone-shaped head portion 23B having an outer diameter φD (>φd) larger than the outer diameter φd of the shaft portion 23A is integrally formed at the tip portion of the pin member 23. A tapered surface 23b is formed at the tip.

Next, the details of the configuration of the female joint 22 that constitutes the insertion type joint 20 will be described below with reference to FIGS. 10 to 12. FIG.

10 is an enlarged detailed view of the F portion of FIG. 2, FIG. 11 is an enlarged cross-sectional view of the GG line of FIG. 10, and FIG. 12 is an enlarged cross-sectional view of the HH line of FIG. As shown in FIG. 11, a metallic sleeve 24 embedded near the joint surface 1d of the segment 1, and as shown in FIG. A spring plate 25 is provided. Specifically, as shown in FIG. 12, insertion holes 24a opening toward the center of the sleeve 24 are formed at upper, lower, left, and right sides of the sleeve 24 in the middle position in the longitudinal direction. An upper spring plate 25 is inserted across the sleeve 24 and fixed to the left and right insertion holes 24a. Similarly, lower spring plates 25 are inserted and fixed across the sleeve 24 into the opposing right and left insertion holes 24a below the sleeve 24 . The rear end of the sleeve 24 is flared like a trumpet to provide an anchoring function, and the flared portion is filled with a plug 27 made of rubber or the like to prevent cement milk from entering the sleeve.

Here, the distance δ between the two spring plates 25 is set smaller than the outer diameter φD (see FIG. 9) of the head portion 23B of the pin member 23 constituting the male joint 21 (δ<φD). Each spring plate 25 is made of elastically deformable spring steel.

Further, as shown in FIG. 12, a rubber seal 26 is attached to the portion of each spring plate 25 protruding outside the sleeve 24 . In addition, the rubber seal 26 functions to prevent the unsolidified concrete from entering the sleeve 24 through the insertion hole 24a and to prevent the spring plate 25 from being dislocated. The rubber seal 26 functions to prevent concrete from entering and to prevent the positional deviation of the spring plate 25. In addition, when the male pin member 23 is inserted, the spring plate 25 is not restrained by the concrete and can be easily elastically deformed. It is an object.

By the way, the number of male joints 21 (pin members 23) and female joints 22 (sleeves 24 and spring plates 25) constituting the insertion type joint 20 is not limited to three, and may be any number as long as it is plural. Further, in the present embodiment, only the pin member 23 of the male joint 21 is projected from one joint surface 1c of the segment 1, and only the sleeve 24 of the female joint 22 is embedded in the other joint surface 1d of the segment 1. Both the pin member 23 and the sleeve 24 may be provided on the surfaces 1c and 2d.

Next, the segment 1 shown in FIGS. 2 and 3 provided with the slide lock type joint 10 and the insertion type joint 20 as described above is connected to the adjacent segment 1A shown in FIG. 1 will be described below with reference to FIGS.

FIGS. 13(a) to 13(c) are partial plan views showing the procedure for connecting segments in the circumferential direction by means of the slide lock type joint according to the present invention, and FIG. 14 is an enlarged cross-sectional view taken along line II of FIG. 13(c) Figures 15(a) to 15(c) are partial side cross-sectional views showing the procedure for connecting segments in the tunnel axial direction by an insertion joint, and Figure 16 is an enlarged cross-sectional view taken along line JJ of Figure 13(b). is.

A case will be described below in which the segment 1 shown in FIG. 1 is circumferentially connected to the adjacent segment 1A, and the segment 1 is connected to the segment 101 of the segment ring 100 already constructed in the tunnel axial direction.

Segment 1 is connected to segment 1A in the circumferential direction by a slide lock joint 10, and segment 1 is connected to segment 101 in the tunnel axial direction by an insertion type joint 20. and the axial direction of the tunnel can be easily and reliably connected at the same time in one pass as follows.

That is, as shown in FIG. 13( a ), a tip portion ( The position of the flange portion 11b) of the I-shaped steel 11A is aligned with the position of the recess 4 opening on the joint surface 1Aa of the segment 1A, and the tip of the male joint 11 of the slide lock type joint 10 provided on the joint surface 1Aa of the segment 1A protrudes. The position of the portion (flange portion 11b of the I-shaped steel 11A) is aligned with the position of the recessed portion 4 that opens to the joint surface 1a of the segment 1.

Next, from the above state, the segment 1 is slid in the direction of arrow a (circumferential direction) in FIG. . At this time, since the tip protrusions (flanges 11b of the I-shaped steel 11A) of the male joints 11 of both segments 1 and 1A are fitted into the recesses 4 of each segment 1 and 1A, the joint surfaces 1a and 1A of both segments 1 and 1A are fitted. Bonding between 1Aa is possible. Also, as shown in FIG. 13(b), when the joint surfaces 1a and 1Aa of both segments 1 and 1A are joined together, the male joint 21 of the insertion type joint 20 provided on one joint surface 1c of the segment 1 is constructed. The positions of the pin member 23 and the sleeve 24 constituting the female joint 22 of the insertion type joint 20 provided on one joint surface 101a of the segment 101 coincide in the circumferential direction (horizontal direction in FIG. 13(b)).

From the above state, when the segment 1 is slid in the direction of arrow b in FIG. The distal end protrusion (flange portion 11b of the I-shaped steel 11A) of the male joint 11 of the slide lock type joint 10 of 1A slides in the same direction in the recesses 4 of the segments 1 and 1A, respectively, and as shown in FIG. Since the protruding end portion (flange portion 11b of the I-shaped steel 11A) of each male joint 11 is inserted and fitted into the V-shaped space S of the V-shaped member constituting each female joint 12, the segment 1 is attached to the adjacent segment 1A. They are connected reliably in the circumferential direction.
13(a) to 13(c) in which the slide lock type joint 10 is installed, when the segment 1 is pushed against the segment 1A by a jack and slid, the segments 1 and 1A are brought into close contact with each other by the wedge effect. Both the male joint 11 and the female joint 21 are inclined at 1:20 as an example. The inclination for obtaining the wedge effect is not limited to the above numerical values.

Here, as described above, the spacing L (see FIG. 7) between the flange portions 11b on the opening side of the V-shaped member that constitutes the female joint 12 is the web of the I-shaped member (I-shaped steel 11A) that constitutes the male joint 11. Since it is set slightly larger than the width b2 (see FIG. 5) of the portion 11a (L>b2), the male joint 11 is formed in the gap between the flange portions 11b on the opening side of the female joint (V-shaped member) 12. The web portion 11a of the I-shaped member (I-shaped steel 11A) is inserted and fitted. Further, as described above, the maximum width W (see FIG. 7) of the V-shaped space S formed in the V-shaped member constituting the female joint 12 is the flange width of the I-shaped member (I-shaped steel 11A) constituting the male joint 11. Since it is set slightly larger than the width b1 (see FIG. 5) of the portion 11b (W>b1), as shown in FIGS. 11A) can be inserted into the V-shaped space S of the female joint 12 of the flange portion 11b.

As described above, the segment 1 and the adjacent segment 1A are connected in the circumferential direction by the slide lock type joint 10, and at the same time, the segment 1 and the adjacent segment 101 are connected in the tunnel axial direction by the insertion type. Joint 20 is done in the following manner.
That is, as shown in FIG. 13(b), three pin members 23 protruding from the joint surface 1c of the segment 1 of the male joint 21 of the insertion type joint 20 and three pin members 22 of the female joint 22 opening to the joint surface 101a of the segment 101. With the two sleeves 24 aligned in the circumferential direction, the segment 1 is slid in the direction of arrow b (upward) until the joint surface 1c of the segment 1 abuts against the joint surface 101a of the segment 101 as described above. A member 23 is inserted into each sleeve 24 as shown in FIG. 15(a).

Then, when the large-diameter head portion 23B of each pin member 23 moves to the position of the two upper and lower spring plates 25 provided across each sleeve 24 as shown in FIG. Since the outer diameter φD (see FIG. 9) of the head 23B is set to be larger than the interval δ (see FIGS. 11 and 12) between the spring plates 25 (φD>δ), the head 23B has two upper and lower parts. 15(b) and 16, the upper and lower spring plates 25 are elastically deformed so as to swell up and down, respectively, and the head of the pin member 23 23B is allowed to pass. Here, since the tip of the head 23B of the pin member 23 is formed with a tapered surface 23b in the shape of a tapered truncated cone, the head 23B can be easily inserted and fitted between the upper and lower spring plates 25. Then, as the head 23B passes, the upper and lower spring plates 25 are spread apart.

Then, when the head portion 23B of the pin member 23 passes between the upper and lower spring plates 25, each spring plate 25 returns to its original flat state due to its elastic restoring force, as shown in FIG. 15(c). Therefore, the end faces of the head portion 23B of the pin member 23 are engaged with the end faces of the upper and lower spring plates 25, thereby reliably preventing the pin member 23 from coming off the sleeve 24. FIG. Therefore, the segment 1 is easily and reliably connected to another segment 101 adjacent thereto in the tunnel axial direction.

As described above, in the present embodiment, the segment 1 can be moved to the slide lock type by a simple operation (one pass) of positioning and sliding the segment 1 according to the procedure shown in FIGS. The joint 10 allows a reliable connection to the other segment 1A in the circumferential direction, and at the same time, the insertion type joint 20 allows the same segment 1 to be reliably connected to the other segment 101 in the tunnel axial direction.

In this embodiment, the male joint 21 of the insertion type joint 20 according to the present invention is made up of only the pin member 23, and the female joint 22 is made up of only the sleeve 24 and the spring plate 25. 20 can be simplified and the cost can be reduced. Then, the pin member 23 of the male joint 21 is inserted into the sleeve 24 of the female joint 22, and the two upper and lower spring plates 25 are spread apart by the head 23B of the pin member 23 so that the head 23B is joined to the two spring plates. 25, both segments 1 and 101 can be connected easily and reliably in one pass, and automation using a robot or the like is possible, and work efficiency can be improved and labor can be saved. In this case, since the tip of the head 23B of the pin member 23 is formed with a tapered surface 23b in the shape of a tapered truncated cone, the head 23B can be easily inserted and fitted between the two spring plates 25. As the head 23B passes, the two spring plates 25 are spread apart to allow the spring plate 25 of the head 23B to pass.

The above description relates to a plurality of concrete segments covering the inner peripheral surface of an excavation hole formed in tunnel construction by the shield construction method, and an insertion type joint for connecting these segments in the axial direction of the tunnel. However, the present invention relates to precast members such as flat concrete segments for culverts and concrete paving slabs for road paving, or other arbitrary segments such as iron segments and connecting them It is also applicable to insertion type joints for

It should be noted that the present invention is not limited in application to the embodiments described above, and that various modifications are possible within the scope of the technical ideas described in the scope of claims, the specification, and the drawings. is of course.

1 Segment 1a-1d Joint surface of segment 5 Anchor 10 Slide lock type joint 11 Male joint of slide lock type joint 12 Female joint of slide lock type joint 20 Insertion type joint 21 Male joint of insertion type joint 22 Female joint of insertion type joint 23 Pin member 23A Pin member shaft 23B Pin member head 23a Pin member male thread 23b Head tapered surface 24 Sleeve 25 Spring plate 26 Rubber seal φd Outer diameter of pin member shaft φD Pin member head Outer diameter δ Spacing between spring plates

Claims (5)

An insertion type joint for connecting precast members comprising two adjacent RC segments, comprising:
A sleeve embedded in the joint of one precast member, a female joint comprising two parallel spring plates crossing the sleeve in the direction perpendicular to the axis,
A pin protruding from the joining surface of the other precast member at a position corresponding to the female joint , and having a head formed at its tip with an outer diameter larger than the interval between the two spring plates of the female joint. a male joint comprising a member;
both precast members by inserting the pin member of the male joint into the sleeve of the female joint, and expanding the spring plate by the head of the pin member to pass the head through the spring plate An insertion type joint characterized by connecting each other. 2. The insertion type joint according to claim 1, wherein the tip of the head of the pin member is formed with a tapered surface in the shape of a tapered truncated cone. 3. The insertion type joint according to claim 1, wherein a rubber seal is attached to a portion of each of said spring plates protruding outside said sleeve. The male joint and the female joint of the insertion type joint according to any one of claims 1 to 3, or any one of these male joints and female joints, is provided at a plurality of locations on the joint surface with other adjacent precast members. A precast member comprising RC segments, characterized in that: 5. A precast member including RC segments according to claim 4, characterized in that it is made of reinforced concrete and the pin members are attached to anchors embedded therein.

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