JP2889741B2 - Joint structure of truss structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a truss structure installed on the sea floor.

[0002]

2. Description of the Related Art A truss structure is submerged on the seabed and used as a fish reef or as a buffer for mitigating waves. Such a truss structure includes, for example, a plurality of bar members made of concrete. Constructed by joining with balls. As the bar member, for example, a member in which a tension member such as a metal tension rope is inserted through a cylindrical cylindrical bar made of concrete is used, and the tensile force acting on the bar member is received by the tension member, and the bar member is compressed. The force is received by the cylindrical bar.

[0003]

By the way, in the conventional truss structure, the ball made of concrete is formed into a hollow sphere due to the difference in the specific gravity of concrete and seawater. In order to form the ball, a spherical core was required, and it was not easy to remove the core after molding.

As is well known, concrete is strong against compressive force, but weak against tensile force, and it has been impossible to apply high tensile force to concrete balls. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a truss structure capable of facilitating the production of a concrete ball and increasing the tensile strength of the ball. It is to provide a joint structure.

[0005]

In order to achieve the above object, the present invention relates to a joint structure of a truss structure constituted by joining a plurality of bar members having tension members with concrete balls. The joint structure is formed by embedding a spherical shell inside the ball, attaching a locking member to the spherical shell, and detachably locking one end of the tension member of the bar member to the locking member. Features.

[0006]

According to the present invention, when molding a ball made of concrete, the spherical shell embedded in the ball can be used as a core, so that the conventionally required core becomes unnecessary. In addition, it is not necessary to take out the core after molding, and the ball can be easily and efficiently manufactured.

If a metal having high tensile strength or reinforced plastic (FRP) is selected as the material of the spherical shell, the spherical shell also functions as a strength member, and the tensile force is received by the spherical shell. The tensile strength of the ball is increased.

[0008]

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

FIG. 5 is a perspective view of a basic truss unit of a truss structure according to the present invention. The basic truss unit is formed by joining six bar members 1... With four balls 2. Is constructed as a three-dimensional truss structure, and a plurality of the basic truss units are combined to construct one truss structure.

Here, the details of the joint structure according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view showing a joint structure according to the present invention, and FIG.
FIG. 3 is a sectional view taken along line BB of FIG. 1, and FIG. 4 is a sectional view taken along line CC of FIG.

As shown in FIG. 1, the ball 2 is a hollow sphere made of concrete, and has a spherical shell 3 made of metal or reinforced plastic (FRP) embedded therein. Metal collars 4 serving as locking members are radially attached to the spherical shell 3, and circular dish-shaped grooves 5 are provided on the outer surface of the ball 2 where the collars 4 project. Are formed. In addition, on the outer surface of the ball 2, adjacent dish-shaped grooves 5...
Are formed.

The spherical shell 3 has a two-part structure, in which circular holes 7 are formed, and the collars 4 are passed through the circular holes 7 from the inside. A flange 4a is formed at one end of the collar 4, and the collar 4 is pushed out of the spherical shell 3 until the flange 4a comes into contact with the inner peripheral surface of the spherical shell 3, and fitted to the outer peripheral portion thereof. The metal or rubber stopper ring 8 prevents the fall into the spherical shell 3.

When all of the collars 4 are attached to the divided pieces of the spherical shell 3 as described above, the two divided pieces are joined and integrated to form the spherical shell 3, and thereafter the spherical shell 3 is assembled. The ball 2 is obtained by pouring concrete into a mold (not shown) as a core and curing the concrete. As shown in FIG. 2, a notched groove 4b is formed on an end surface of the collar 4 projecting from the ball 2, and a circular shape connected to the notched groove 4b is formed on a side wall of the collar 4 as shown in FIG. A groove 4c is formed.

On the other hand, as shown in FIG.
Is formed by inserting a metal tension rod 10 as a tension member into a cylindrical cylindrical bar 9 made of concrete, and a bar end socket 1 made of metal is provided at an end of the bar 9.
1 is fitted. The bar-end socket 11 holds an elastic head 12 formed in a cylindrical shape with an elastic body such as rubber, and a metal head cup 13 is covered on an end of the elastic head 12. . The head cup 13 is formed into a shape that fits into the dish-shaped groove 5 formed on the outer surface of the ball 2.
4 and nuts 15 screwed to the bolts 14 are connected to the bar end socket 11.

A stopper 16 is attached to the end of the tension rod 10.
As shown in FIG. 2, a projection 16a is formed to engage with a cutout groove 4b formed on the end face of the collar 4.

As shown in FIG. 1, the tension rod 10 is divided into a rod 10A and a rod 10B, which are connected to each other by a turnbuckle 17 screwed to them. This turnbuckle 17
Constitutes a length adjusting mechanism of the tension rod 10, and the rod 10 </ b> A,
10B are moved in opposite directions to adjust the length of the tension rod 10.

A bevel gear 18 is integrally formed at the end of the turnbuckle 17, and the turnbuckle 17 has one of oblong holes 19a and 19b formed at opposing portions of the bar 9. It is rotated by a rotary tool 20 inserted from 19a. That is, the support 21 is inserted into the bar 9 from the oblong hole 19b, and the end of one rod 10A is inserted into the concave groove 2 of the support base 22 of the support 21.
2a is fitted and supported. Note that the width dimension a (see FIG. 3) of the support base 22 is set smaller (a <L) than the length dimension L (see FIG. 4) of the oblong hole 9b, and the thickness dimension t (see FIG. 1) is It is smaller than the width dimension b of the oblong hole 19b (t <
b) It is set. Therefore, the support 22 of the support 21
Can be inserted into the bar 9 by rotating the entire support 21 by an angle of 90 ° with respect to the state shown by the solid line, as shown by a chain line in FIGS. Then, the support table 22
Is inserted into the bar 9 after passing through the oblong hole 19b, and then the entire support 21 is rotated by an angle of 90 °, as shown by a solid line in FIG. 1 and FIG. The end of the rod 10A can be supported by the concave groove 22a.

On the other hand, a handle 24 is attached to an upper end of a shaft 23 of the rotary tool 20, and a bevel gear 25 to be meshed with a bevel gear 18 formed on the turnbuckle 17 is formed at a lower end of the shaft 23. Have been. A bearing member 26 is inserted through the shaft 23, and a lower surface of the bearing member 26 has projections to be engaged with engagement grooves 22 b formed on the upper surface of the support base 22 of the support 21. 26a are protruded.

The bearing member 26 of the rotary tool 20
The dimensional relationship with respect to the oblong hole 19a is the same as the dimensional relationship with respect to the oblong hole 19b of the support 22 of the support 21. To insert the rotary tool 20 into the bar 9, it is shown by a chain line in FIG. Thus, the bearing member 26 may be passed through the oblong hole 19a while being rotated by an angle of 90 ° from the state shown by the solid line. After the bearing member 26 is inserted into the bar 9, the bearing member 26 is turned by an angle of 90 °, and the projections 26 a projecting from the lower surface thereof are engaged with the engagement grooves 22 b formed in the support base 22. , 22b to join and integrate the bearing member 26 with the support base 22, as shown in FIGS. 1 and 3, the bevel gear 25 of the rotary tool 21 is connected to the bevel gear 18 formed on the turnbuckle 17. Mesh. At this time, the rods 10A, 1A
The rotation of 0B is achieved by engaging the projection 16a of the stopper 16 provided at each end with the notch groove 4b of the collar 4.

Therefore, if the shaft 23 is turned by operating the handle 24 of the rotary tool 20 in the above state, the shaft 2
The rotation of No. 3 is transmitted to the turnbuckle 17 via the bevel gears 25 and 18, and the turnbuckle 17 is rotated to adjust the length of the tension rod 10 as described above. After the length adjustment, the rotary tool 20 and the support 21 are pulled out of the bar 9 in the same manner as when they are inserted.

Next, the procedure for joining each bar member 1 to the ball 2 will be described.

First, the nuts 15 provided at the ends of the bar member 1 are turned to move the head cup 13 along the bolts 14 to the bar end socket 11 side as shown by the chain line in FIG. 2 to a position that does not interfere with the outer surface of the bar member 1) to reduce the length of the entire bar member 1. The movement of the head cup 13 is allowed by the compression deformation of the elastic head 12.

In the above state, the tension rod 1
Although the length of the ball 2 is invariable, the stopper 16 at the end of the tension rod 10 passes through the concave groove 6 formed on the outer surface of the ball 2 to reach the dish groove 5, and the dish groove 5 The collar 4 is fitted into the collar 4 through a circular groove 4c formed in the side wall of the collar 4 and the projection 16a formed in a part of the collar 4c.
Engages with a notch groove 4b formed in the end face of the collar 4.

When the nuts 15 are loosened after the stopper 16 of the tension rod 10 is fitted into the collar 4 as described above, the head cup 13 returns to the original position by receiving the compression reaction force of the elastic head 12, As shown by the solid line in FIG. 1, the ball 2 is fitted into and adhered to the dish-shaped groove 5 formed on the outer surface of the ball 2.

Finally, if the length of the tension rod 10 is adjusted as described above, the ball 2
The joint work to is completed.

By repeating the above joint operation, one truss structure is constructed. In the truss structure, the tensile force acting on the bar member 1 is received by the tension rod 10 and the compressive force is transmitted by the bar 9. Can be received. The impact force acting on the truss structure is absorbed and reduced by the elastic head 12.

In the above, according to the present embodiment, the spherical shell 3 embedded in the ball 2 can be used as a core when the concrete ball 2 is formed, which has been conventionally required. The core is not required, and the work of removing the core after molding is not required, so that the ball 3 can be manufactured easily and efficiently.

Further, as in the present embodiment, the material of the spherical shell 3 is a metal having a high tensile strength or a reinforced plastic (FRP).
Is selected, the spherical shell 3 also functions as a strength member,
The tensile force is also received by the spherical shell 3 to increase the tensile strength of the ball 2.

Next, a modified embodiment of the present invention will be described with reference to FIGS.
Shown in 6 is a sectional view showing a joint structure according to a modified embodiment, FIG. 7 is a sectional view taken along line DD of FIG. 6, and FIG.
3 is an enlarged detailed view of a portion E of FIG. 1, in which the same elements as those shown in FIG. 1 are denoted by the same reference numerals.

In this embodiment as well, the spherical shell 3 made of metal or reinforced plastic is embedded in the ball 2 made of concrete as in the previous embodiment. Are mounted.

On the other hand, a nut member 32 is held on the head cup 13 side so as to be relatively movable, and a tension rod (or tension wire) is attached to the nut member 32.
One end of 10 is attached in advance. That is, when the stopper 16 provided at the end of the tension rod 10 engages with the nut member 32, the nut member 3
2 attached. The tension rod 10 is divided into two parts, and the two divided pieces are detachably connected.

On the outer peripheral surface of the nut member 32, two axially long notch grooves 32a, 32a are formed at positions facing each other, and the head cup 13 is formed in the notch grooves 32a, 32a. Projections 13a projecting from the inner peripheral portion of
The nut 13a is prevented from falling off the nut member 32 by the circlip 33 fitted on the outer peripheral portion of the nut member 32. Therefore,
The head cup 13 can rotate integrally with the nut member 32, and can slide in the axial direction with respect to the nut member 32 by a distance ΔS (length adjustment allowance for the tension rod 10) in FIG.

Here, the procedure for joining the bar member 1 to the ball 2 will be described.

In this embodiment, too, the nuts 15 are turned to move the head cup 13 along the bolts 14 to the bar end socket 11 to the position shown by the chain line in FIG. Have to wait at a remote location. At this time, the tension rod 10 is not moved, and the head cup 13 and the nut member 32 move with respect to the tension rod 10.

Next, when the nuts 15 are loosened, the head cup 13 moves leftward in FIG. 6 under the compressive reaction force of the elastic head 12, and after the head cup 13 contacts the circlip 33, the nut member 32 is moved. Also moves leftward integrally, and the nut member 32 is fitted to the head of the bolt 31 on the ball 2 side. If the head cup 13 is turned from this state and the nut member 32 is also turned integrally therewith, the nut member 32 is screwed into the bolt 31 and moves to the left in FIG. When the nut member 32 is screwed onto the bolt 31, the bar member 1 is joined to the ball 2 as shown by the solid line in FIG. If the cup 13 is further turned, only the nut member 32 can move by ΔS as shown in the state where the head cup 13 is in contact with the ball 2, whereby the length of the tension rod 10 is adjusted, and The slack in ΔS is eliminated. Therefore, if the length of the tension rod 10 is set to be shorter than the regular dimension between the pair of balls 2, the length of the tension rod 10 can be easily adjusted.

In this embodiment, the spherical shell 3 is buried inside the ball 2, so that the same effects as those of the above embodiment can be obtained. Since the joint of the member 1 is made simple and the joint structure itself has the function of adjusting the length of the tension rod 10, the effect of easily fitting and adjusting the length of the tension rod 10 can be obtained.

[0037]

As apparent from the above description, according to the present invention, in a joint structure of a truss structure constituted by joining a plurality of bar members having a tension member with concrete balls, A spherical shell is embedded in the ball, a locking member is attached to the spherical shell, and one end of the tension member of the bar member is removably locked to the locking member, thereby facilitating the production of a concrete ball. In addition, the effect of increasing the tensile strength of the ball can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a joint structure according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along line CC of FIG. 1;

FIG. 5 is a perspective view of a basic truss unit of the truss structure according to the present invention.

FIG. 6 is a sectional view showing a joint structure according to a modified embodiment of the present invention.

FIG. 7 is a sectional view taken along line DD of FIG. 6;

FIG. 8 is an enlarged detail view of a portion E in FIG. 6;

[Explanation of symbols]

 Reference Signs List 1 bar member 2 ball 3 spherical shell 4 collar (locking member) 9 bar 10 tension rod (tension member) 31 bolt (locking member) 32 nut member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04B 1/58 E04B 1/19

Claims (1)

(57) [Claims] 1. A joint structure of a truss structure constituted by joining a plurality of bar members having a tension member with concrete balls, wherein a spherical shell is embedded in the balls, and A joint structure for a truss structure, wherein a locking member is attached to a shell, and one end of a tension member of the bar member is detachably locked to the locking member.