JP6738599B2 - Joint structure of precast concrete plates - Google Patents

Description

The present invention relates to a joining structure and a joining method for joining precast concrete boards.

2. Description of the Related Art Conventionally, in a building having a wall type structure, in order to shorten the construction period, a precast concrete wallboard is manufactured in advance, and the wallboard is transported to the site and joined to each other. The wall plates are joined together, for example, by the structure shown in Patent Document 1.

FIG. 15 is a horizontal sectional view and an elevation view of a joint structure 100 of a precast concrete plate to which the joint structure of Patent Document 1 is applied.
The joining structure 100 of precast concrete boards joins wallboards 101 and 102 made of precast concrete. On the joint surfaces of the wall plates 101 and 102, annular cotter lines 103 and 104 facing each other are provided, and these cotter lines 103 and 104 are connected by a joint member 105. The joint member 105 is substantially U-shaped, and includes a leg portion 106 arranged substantially in parallel and a connecting portion 107 connecting the leg portions 106 to each other.

In the joint structure 100 of precast concrete, the pair of leg portions 106 of the joint member 105 are inserted into the inside of the annular cotter reinforcements 103 and 104, respectively, to bridge the joint member 105 between the cotter reinforcements 103 and 104. ing.
In this state, concrete 108 is placed between the wall plates 101 and 102.

JP, 2004-003231, A

However, the above structure has the following problems.
As described above, when bridging the joint member 105 between the cotter muscles 103 and 104, the leg portion 106 of the joint member 105 is inserted inside the cotter muscles 103 and 104. A gap d is formed between the gaps 103 and 104, and the gap d is filled with concrete.

Therefore, for example, when a force acts in a direction in which the wall plates 101 and 102 separate due to an earthquake motion, the tensile force acting on the joint between the wall plates 101 and 102 is applied from one cotter streak 103 through the concrete body. It is transmitted to the joint member 105 and further transmitted from the joint member 105 to the other cotter streak 104 via the concrete body. Therefore, in reality, there was some delay in the response at the time of the earthquake.

The present invention can reduce the delay in response of an earthquake, and an object thereof is to provide a junction structure of precast concrete plate.

The joint structure of precast concrete boards according to claim 1 is a joint structure for joining a pair of precast concrete precast concrete boards (for example, wall boards 1A, 1B, 1F, floor boards 1G, 1H, 1I described later) to each other. There, at least a pair of annular cotter muscles (for example, cotter muscles 20A, 20B, 20F, 20G, 20H, and 20I described below) are provided on the joint surface of the pair of precast concrete plates (for example, the joint surface 10 described below). Are provided so as to face each other, the pair of cotter muscles are arranged in an overlapping manner, and the overlapped portion is an annular insertion portion (for example, an insertion portion 23 described later), and the insertion portion is , A pin (for example, a pin 33 described later) is inserted.

According to the present invention, the pair of cotter muscles are arranged so as to overlap each other, and the pin is inserted into the insertion portion which is the overlapped portion, so that the tensile force acting on the joint between these precast concrete plates is one cotter. From the muscle, it is directly transmitted to the other cotter muscle through the pin, and the cotter muscles are firmly connected to each other.
Therefore, even if a force acts in the direction in which the precast concrete plates separate from each other or in the direction in which the precast concrete plates deviate from each other due to the earthquake motion, the joint portion can be reliably reinforced and the delay in the response at the time of the earthquake can be reduced.
In addition, since the cotter reinforcements are joined together by using pins instead of the conventional joint member, the amount of rebar can be reduced as compared with the prior art.

The precast concrete board joint structure according to claim 2 is characterized in that the pair of cotter streaks are provided in a vertical direction, and the pins extend in a horizontal direction.

The precast concrete board joining structure according to claim 3 is a joining structure for joining three precast concrete boards arranged in a substantially T-shape in a plan view, and the three precast concrete boards are opposed to each other. And a pair of first wall plates (for example, wall plates 1C and 1D described later) and a second wall plate (for example, a wall plate described later) arranged to intersect the first wall plate. 1E), and at least a pair of annular cotter muscles (for example, cotter muscles 20C and 20D described later) are formed on the joint surface (for example, the joint surface 10 described below) of the first wall plates. The cotter muscles of the wall plates that are provided to face each other are arranged so as to overlap each other, and the overlapped portion is an annular insertion portion (for example, an insertion portion 23 described later). A cotter streak (for example, a cotter streak described later) into which a first pin (e.g., a pin 33A below described) is inserted and a second pin (e.g., a pin 33B described below) is inserted into the second wall plate. 20E) is provided, and an annular joint member (for example, a joint member 40 described later) is locked between the cotter streak of the first wall plate and the second pin.

According to this invention, there is the same effect as in claim 1.

The joining method of the precast concrete plate of the present invention is a method of joining a pair of precast concrete plates made of precast concrete, and a pair of annular cotter streaks are provided on the joining surfaces of the pair of precast concrete plates, At least one of the pair of cotter muscles (for example, the cotter muscle 20B described later) is tilted with respect to the extending direction of the precast concrete plate, and the pair of precast concrete plates are paired with each other. A step of arranging them so as to face each other (for example, step S1 described later), and a step of bending the inclined cotter muscles so that the pair of cotter muscles are overlapped with each other to form the overlapped portion as an annular insertion portion ( For example, it is preferable to include a step S2) described below and a step of inserting a pin into the insertion portion (for example, step S3 described below).

According to this invention, in addition to the effect of claim 1, the following effect is obtained.
That is, at least one of the pair of cotter streaks was inclined with respect to the extending direction of the precast concrete plate, and in this state, the pair of precast concrete plates were arranged. Therefore, when the precast concrete board is arranged, the cotter streaks do not interfere with each other, which facilitates the installation work of the precast concrete board.

In the method of joining a precast concrete plate according to the present invention , in the step of inserting the pin into the insertion portion, a supporting portion (for example, an extending portion 31 and a connecting portion 32 described later) and a pin attached to the supporting portion (for example, , A pin 33 described later, and a pin member (for example, a pin member 30 described later) having a support part of the pin member abutting on the insertion part are arranged, so that the pin is inserted into the insertion part. It is preferable to insert it.

According to the present invention, the support portion of the pin member is arranged in contact with the insertion portion, so that the pin is inserted into the insertion portion, so that the pin can be easily attached and the construction period can be shortened.

According to the present invention, even if a force acts in a direction in which precast concrete plates are separated from each other or a direction in which precast concrete plates are displaced from each other due to a seismic motion, the joint portion is reliably reinforced, and a delay in response during an earthquake is reduced. it can. In addition, since the cotter reinforcements are joined together by using pins instead of the conventional joint member, the amount of reinforcement can be reduced as compared with the conventional art.

It is an elevation view of a pair of wall boards to which the joining structure of the precast concrete board concerning a 1st embodiment of the present invention was applied. It is an expanded elevation view of the joining part of the cotter muscles of a pair of wall boards which concern on the said embodiment. FIG. 3 is a sectional view taken along line AA of FIG. 2. It is a disassembled perspective view of the joining part of the cotter muscles which concerns on the said embodiment. It is an elevation view of the pin member attached to the cotter muscle according to the embodiment. It is a figure for demonstrating the usage method of the pin member attached to the cotter muscle concerning the said embodiment. It is a flowchart of the procedure of constructing the joining part of a pair of wall boards which concerns on the said embodiment. It is a horizontal sectional view of a wall board to which the joining structure of the precast concrete board concerning a 2nd embodiment of the present invention was applied. FIG. 8 is a sectional view taken along line BB of FIG. 7. It is a flowchart of the procedure which builds the junction part of the wall plates which concern on the said embodiment. It is a figure for demonstrating the procedure of constructing the junction part of the wall plates which concern on the said embodiment. It is a longitudinal section of a wall board and a floor board to which the joining structure of the precast concrete board concerning a 3rd embodiment of the present invention was applied. It is a longitudinal section of the floorboard to which the joining structure of the precast concrete board concerning a 4th embodiment of the present invention was applied. It is a perspective view of the pin member which concerns on the modification of this invention. It is the typical horizontal cross section and elevation of the joining structure of the precast concrete board concerning the prior art example of the present invention.

Embodiments of the present invention will be described below with reference to the drawings. In the following description of the embodiments, the same constituents will be given the same reference numeral, and the description thereof will be omitted or simplified.
[First Embodiment]
FIG. 1 is an elevation view of a pair of wall plates 1A and 1B to which a precast concrete plate joint structure according to a first embodiment of the present invention is applied.

The wall plates 1A and 1B are made of precast concrete and are arranged substantially vertically. The side surfaces of the wall plates 1A and 1B facing each other form a joint surface 10. A joint portion 2 between the wall plate 1A and the wall plate 1B is formed by arranging between the joint surfaces 10 of the wall plates 1A and 1B and filling with concrete.

The joint surface 10 of the pair of wall plates 1A, 1B is formed with unevenness in the vertical direction, and these unevenness is a shear cotter.
A plurality of pairs of cotter lines 20A and 20B facing each other are provided along the joint surface 10 of the wall plates 1A and 1B. That is, assuming that a pair of cotter muscles 20A and 20B facing each other is a set, a plurality of sets of the cotter muscles 20A and 20B are provided along the joint surface 10 at predetermined intervals in the vertical direction.

FIG. 2 is an enlarged elevational view of the joint between the cotter muscles 20A and 20B, and FIG. 3 is a sectional view taken along line AA of FIG. FIG. 4 is an exploded perspective view of a joint portion between the cotter muscles 20A and 20B.
Each cotter streak 20A, 20B has a substantially U shape provided in the vertical direction along the wall plates 1A, 1B, and forms a rectangular ring shape together with the joint surface 10. The cotter bars 20A and 20B are formed by bending a reinforcing bar material, and are fixed to the wall plates 1A and 1B to extend from the joint surface 10 and a pair of bar-shaped extending portions 21 that extend substantially parallel to each other. And a rod-shaped connecting portion 22 that connects the front end portions of the projecting portions 21.

A part of the pair of cotter muscles 20A and 20B is arranged so as to overlap each other, and this overlapped portion serves as a rectangular annular insertion portion 23.
Specifically, the extension parts 21 of the cotter muscles 20A and 20B are arranged so as to overlap each other, so that the insertion part 23 connects the extension part 31 and the coupling part 32 of the cotter muscle 20A to the cotter muscle 20B. It is composed of the unit 32.
A pin member 30 is attached to the insertion portion 23.

The pin member 30 is connected to the extension part 31 as a pair of rod-shaped support parts extending substantially parallel to each other, the connection part 32 as a support part connecting one end sides of the extension part 31, and the extension part 31. And a pair of pins 33 attached to the corners of the portion 32.
The extending portion 31 and the connecting portion 32 are substantially U-shaped.

The axial direction of the pair of pins 33 is substantially perpendicular to the surface formed by the extending portion 31 and the connecting portion 32. Further, as shown in FIG. 5, the distance between the connecting portion 32 and the pair of pins 33 is p, and the distance between the pair of pins 33 is q.
In this pin member 30, since the space p between the connecting portion 32 and the pin 33 is secured, it is necessary to apply a force to the end portion of the extending portion 31 to the outside or inside as shown by the white arrow in FIG. Then, the extending portion 31 is elastically deformed, and the interval q between the pair of pins 33 is increased or decreased.

The pair of pins 33 are inserted into the insertion portion 23 by disposing the pin member 30 on the side surface of the insertion portion 23 and bringing them into contact with each other.
Specifically, as shown in FIG. 4, the extending portion 31 of the pin member 30 contacts the side surface of the extending portion 21 of the cotter muscle 20A, and the connecting portion 32 of the pin member 30 connects the cotter muscle 20A. It contacts the side surface of the portion 22. As a result, the pair of pins 33 extend in the horizontal direction and are arranged at the upper and lower ends inside the rectangular annular insertion portion 23 in a plan view. At this time, the extending portion 31 of the pin member 30 is elastically deformed, whereby the interval q between the pair of pins 33 is appropriately adjusted, and the pair of pins 33 fits into the insertion portion 23.

At this time, as shown in FIG. 6, even if the cotter streaks 20A and 20B are vertically displaced by a dimension r, the pin member 30 is elastically deformed and the interval between the pins 33 is set to q′ smaller than q. By doing so, such a shift can be dealt with.

Hereinafter, a procedure for constructing the joint portion 2 of the wall plates 1A and 1B will be described with reference to the flowchart of FIG.
First, the wall plates 1A and 1B are prepared. At this time, the cotter lines 20A and 20B of the wall plates 1A and 1B are substantially parallel to the extending direction of the wall plates 1A and 1B.

In step S1, the pair of wall plates 1A and 1B are arranged so that the cotter lines 20A and 20B face each other. At this time, by bending the cotter muscle 20B, the pair of cotter muscles 20A and 20B are overlapped with each other to form the annular insertion portion 23.

In step S2, the pin 33 is inserted into the insertion portion 23 by placing the pin member 30 in contact with the side surface of the insertion portion 23.
In step S3, a mold is built between the wall plates 1A and 1B, and concrete is poured.

According to this embodiment, there are the following effects.
(1) Since the pair of cotter muscles 20A and 20B are arranged so as to overlap with each other and the pin 33 is inserted into the insertion portion 23 which is the overlapped portion, the tensile force acting on the joint portion 2 between the wall plates 1A and 1B. Is directly transmitted from the one cotter muscle 20A to the other cotter muscle 20B via the pin 33, and the cotter muscles 20A and 20B are firmly connected to each other.
Therefore, even if a force acts in the direction in which the wall plates 1A and 1B are separated from each other or the direction in which the wall plates 1A and 1B are displaced from each other due to the earthquake motion, the joint portion 2 is reliably reinforced and the response delay during an earthquake is delayed. It can be reduced.
In addition, since the cotter reinforcements 20A and 20B are joined together using the pin 33 instead of the conventional joint member, the amount of reinforcement can be reduced as compared with the prior art.

(2) By disposing the extending portion 31 and the connecting portion 32 of the pin member 30 on the side surface of the insertion portion 23, the pin 33 is inserted into the insertion portion 23, so that the pin 33 can be easily attached and the construction period can be shortened. ..

[Second Embodiment]
FIG. 8 is a horizontal sectional view of wall plates 1C, 1D, and 1E to which the precast concrete plate joint structure according to the second embodiment of the present invention is applied. 9 is a sectional view taken along line BB of FIG.
In the present embodiment, the wall plates 1C, 1D as the first wall plate and the wall plate 1E as the second wall plate are arranged in a substantially T shape in a plan view, and the wall plates 1C, 1D, 1E are It is different from the first embodiment in that the end faces are joined together.
That is, the wall plates 1C, 1D, and 1E are composed of a pair of wall plates 1C and 1D arranged to face each other, and a wall plate 1E arranged substantially orthogonal to the pair of wall plates 1C and 1D. To be done.

The wall plates 1C, 1D, 1E have the same structure as the wall plates 1A, 1B, and a plurality of sets of cotter streaks 20C, 20D, 20E facing each other are provided in the vertical direction.
Of these, the pair of cotter muscles 20C and 20D are opposed to each other, and are arranged so as to partially overlap with each other, and the overlapped portion serves as a rectangular annular insertion portion 23.

The first pin member 30A is attached to the insertion portion 23. The first pin member 30A has the same configuration as the pin member 30. By disposing the first pin member 30A on the side surface of the insertion portion 23, the pair of pins 33A as the first pins are inserted into the insertion portion 23.

The second pin member 30B is attached to the cotter muscle 20E of the wall plate 1E. The second pin member 30B has the same configuration as the pin member 30. By disposing the second pin member 30B on the side surface of the cotter muscle 20E, the pair of pins 33B as the second pins are inserted into the cotter muscle 20E.

Further, the joining member 40 is locked between the cotter muscles 20C and 20D of the wall plates 1C and 1D and the pin 33B of the second pin member 30B.
Specifically, the joining member 40 is annular, and the cotter lines 20C and 20D of the wall plates 1C and 1D and the pair of pins 33B are inserted therethrough.

Hereinafter, the procedure for constructing the joint 2 between the wall plates 1C, 1D, 1E will be described with reference to the flowchart in FIG.
As an initial state, as shown in FIG. 11, the joining member 40 is passed through the cotter muscles 20C and 20D of the wall plates 1C and 1D.
In step S11, as shown in FIG. 11, the wall plates 1C and 1D and the wall plate 1E are arranged, and the cotter muscles 20C and 20D of the pair of wall plates 1C and 1D are overlapped with each other to form an annular insertion portion 23. ..

In step S12, as shown by the arrow P in FIG. 11, the pin 33A is inserted into the insertion portion 23 by attaching the first pin member 30A to the side surface of the insertion portion 23.
In step S13, as shown by the arrow Q in FIG. 11, the second pin member 30B is attached to the side surface of the cotter streak 20E of the wall plate 1E to insert the pin 33B into the cotter streak 20E.

In step S14, as shown by the arrow R in FIG. 11, the joining member 40 is slid and locked between the cotter muscles 20C and 20D of the wall plates 1C and 1B and the pin 33B of the second pin member 30B. ..
In step S15, a mold is built between the wall plates 1C, 1D, and 1E, and concrete is poured.

According to this embodiment, there are the same effects as the above (1) and (2).

[Third Embodiment]
FIG. 12 is a vertical cross section of a wall board 1F and a floor board 1G to which the precast concrete board joint structure according to the third embodiment of the present invention is applied.
The present embodiment differs from the first embodiment in that the two wall plates 1F and the floor plate 1G are arranged in a substantially L shape, and the side surface of the upper end portion of the wall plate 1F is joined to the side surface of the floor plate 1G.

That is, the wall plate 1F is provided with lattice-shaped and double-arranged wall reinforcements and reinforcing bars 3 as crack prevention reinforcements.
Further, a notch is formed on the floor plate 1G side of the upper end portion of the wall plate 1F, and a cotter streak 20F is provided on the joint surface 10 which is the inner wall surface of the notch. The cotter bar 20F is formed by bending a reinforcing bar into a substantially L shape in a side view, and the fixing portion 60 of the cotter bar 20F extends in the vertical direction and is fixed between the reinforcing bars 3 of the wall plate 1F. ..

The floor plate 1G is provided with lattice-shaped reinforcing bars 4.
A cotter streak 20G is provided on the joint surface 10 of the floor plate 1G. The cotter bar 20G is formed by bending a reinforcing bar into a crank shape in a side view, and as a fixing part, a horizontal fixing part 70 that extends horizontally along the reinforcing bar 4 of the floorboard 1G, and obliquely upward from the tip of the horizontal fixing part 70. And an inclined fixing section 71 extending.

When the floor board 1G is manufactured, as shown by the broken line in FIG. 12, the cotter streak 20G is arranged on the extension line of the inclined fixing section 71 without being bent at the bending point S. As a result, the cotter muscle 20G is inclined obliquely upward with respect to the extending direction of the floor plate 1G.
And when constructing the joint part 2 of the wall board 1F and the floor board 1G, after arranging the wall board 1F and the floor board 1G, the cotter muscle 20F is bent at the bending point S and the cotter muscle 20G is bent at the bending point S. The pin member 30 is attached by bending and overlapping the cotter streak 20F.

According to this embodiment, in addition to the effects (1) and (2) described above, the following effects are obtained.

(3) When arranging the floorboard 1G, the floorboard 1G is hung from above, but when the cotter muscle 20G is substantially parallel to the extending direction of the floorboard 1G, the cotter muscle 20G interferes with the cotter muscle 20F.
Therefore, in the present embodiment, the cotter streak 20G is inclined obliquely upward with respect to the extending direction of the floor plate 1G, and the floor plate 1G is arranged in this state. Therefore, when the floorboard 1G is arranged, the cotter muscle 20G does not interfere with the cotter muscle 20F, so that the installation work of the floorboard 1G becomes easy.

(4) When the cotter muscles are arranged to be inclined in the extending direction of the floorboard, when the cotter muscles are driven in substantially parallel to the extending direction of the floorboard, the cotter muscles are bent once and inclined with respect to the extending direction, In this state, the precast concrete plate is arranged, and then the slanted cotter bar is bent again. In this case, since the cotter muscle is bent twice, the strength of the cotter muscle may decrease.
Therefore, in the present embodiment, the cotter streak 20G is previously arranged on the extension line of the inclined fixing portion 71 and is driven so as to be inclined with respect to the extending direction of the precast concrete board 1G. Therefore, after the precast concrete board 1G is arranged, it is only necessary to bend the cotter streak 20G once at the bending point S, and thus it is possible to suppress the strength of the cotter streak 20G from decreasing.

[Fourth Embodiment]
FIG. 13 is a vertical cross section of floorboards 1H and 1I to which the precast concrete board joining structure according to the fourth embodiment of the present invention is applied.
In this embodiment, the cotter muscles 20H and 20I of the floor boards 1H and 1I are joined together.
Here, the floor boards 1H and 1I have the same structure as the floor board 1G.

When the floor boards 1H and 1I are manufactured, the cotter lines 20H and 20I are arranged on the extension lines of the inclined fixing section 71 as shown by the broken lines in FIG.
And when constructing the joint part 2 of the floor boards 1H and 1I, after arranging the floor boards 1H and 1I, the cotter muscles 20H and 20I are bent at the bending point S, and the cotter muscles 20H and 20I are overlapped with each other to form a pin. Attach the member 30.

According to this embodiment, there are the same effects as the above (1) to (4).

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within the scope of achieving the object of the present invention are included in the present invention.
For example, in each of the above-described embodiments, the pin members 30, 30A, and 30B in which the two pins 33 are attached to the substantially U-shaped extending portion 31 and the connecting portion 32 are used, but the present invention is not limited to this. As shown in FIG. 14, a pin member 30C in which a plurality of pins 33, here, six pins 33 are attached to a linearly extending rod-shaped support portion 34 may be used. By using this pin member 30C, the pin 33 can be inserted into the three insertion portions 23 arranged in the vertical direction at one time, and the workability is improved.

Further, in the above-described first and second embodiments, the cotter muscles 20A to 20E of the wall plates 1A to 1E are arranged substantially parallel to the extending direction of the wall plates 1A to 1E, but not limited to this, the floor plate 1G to. As in 1I, the cotter streaks may be arranged obliquely with respect to the extending direction of the wall plate.

Further, the extending portions that are above and below the cotter muscle may be welded and fixed to each other. By doing so, the cotter muscles can be more firmly integrated with each other, and the response performance during an earthquake can be further improved.

1A, 1B, 1C, 1D, 1E, 1F... Wall plate 1G, 1H, 1I... Floor plate 2... Joining part 3, 4... Reinforcing bar 10... Joining surface 20A, 20B, 20C, 20D, 20E... Cotter bar 20F, 20G, 20H, 20I...cotter muscle 21...extension part 22...connection part 23...insertion part 30...pin member 30A...first pin member 30B...second pin member 30C...pin member 31...extension part 32...connection part 33... Pin 33A... Pin (first pin)
33B... pin (second pin)
34... Supporting part 40... Joining member 60... Fixing part 70... Horizontal fixing part 71... Inclined fixing part

Claims (3)

A joining structure for joining a pair of precast concrete plates made of precast concrete,
On the joint surface of the pair of precast concrete plates, at least a pair of approximately U-shaped cotter streaks are provided to face each other,
The pair of cotter muscles are arranged to overlap each other, and the overlapped portion is an annular insertion portion,
A pin member is attached to the insertion portion ,
The pin member is a substantially U-shaped support portion that is arranged so as to overlap the substantially U-shaped cotter streak, and a pair of pins that are provided in the support portion and that are inserted into both ends of the insertion portion, junction structure of precast concrete plate, wherein the Turkey of having a. The precast concrete board is a wall board,
The pair of cotter muscles are substantially U-shaped in an elevation view, and a plurality of sets are provided in the vertical direction along the joint surface of the wall plate,
The precast concrete board joint structure according to claim 1, wherein the pin extends in a horizontal direction. A joining structure for joining three precast concrete plates arranged in a substantially T shape in a plan view,
The three precast concrete plates are composed of a pair of first wall plates arranged to face each other, and a second wall plate arranged to intersect with the first wall plate,
At least a pair of substantially U-shaped cotter streaks are provided facing each other on the joint surface between the first wall plates.
The cotter muscles are arranged to overlap each other, and the overlapped portion is an annular insertion portion,
A first pin member is attached to the insertion portion ,
The first pin member includes a substantially U -shaped support portion that is arranged so as to overlap the substantially U-shaped cotter streak of the first wall plate, and the upper and lower portions of the insertion portion that are provided on the support portion. possess a pair of first pins to be inserted into the end, and
The second wall plate is provided with a U-shaped cotter streak,
A second pin member is attached to the cotter muscle of the second wall plate ,
The second pin member includes a support portion that is disposed so as to overlap the substantially U-shaped cotter muscle of the second wall plate, and a top and bottom of the cotter muscle of the second wall plate that is provided on the support portion. possess a pair of second pin to be inserted into the end, and
A joint structure for a precast concrete plate, wherein an annular joint member is locked between the cotter streak of the first wall plate and the second pin.

Images