JPH02213548A - Truss and construction method thereof - Google Patents

Abstract

PURPOSE:To facilitate the fixing work of a truss by connecting upper reinforcing steels to each other by means of a reinforcing steel joint, bending the center portion of a lattice, fixing the both top ends of it to the holes of the reinforcing steel joint, and fixing a lower reinforcing steel to the outer surface of the bent portion of a lattice. CONSTITUTION:Upper reinforcing steels 21 are connected to each other by means of a reinforcing steel joint 9 with holes at the center of it. Next, the both top ends of a lattice 41 bent at the center of it are inserted into the holes of the adjacent reinforcing steel joint 9 to fix the reinforcing steel joint 9 fixed to the upper reinforcing steel 21 to the lattice 41. The outer surface of the bent portion of the lattice 41 is fixed to the corresponding surface of the reinforcing steel joint 9 to fix the lattice 41 and a lower reinforcing steel 31. Thus, a truss can be produced with easy work procedure and also produced even at a construction site.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a truss, and more particularly to a truss used in construction and the like.

(Conventional example) As a conventional truss, one is known in which the end face is shown in FIG. 13a and the front face is shown in FIG.

That is, the reinforcing bars (61) are connected to each other by the connecting members (62). On the other hand, the lattice (63) is formed into a sawtooth shape with continuous peaks and valleys, and the peak-shaped ends (64) are welded to spacers (62) that are attached to the upper and lower reinforcing bars, respectively.

(Problems to be Solved by the Invention) However, in the conventional example, since the long reinforcing bars and the lattice are fixed to each other in the longitudinal direction, there is a problem that the fixing work is difficult. Furthermore, when forming an upwardly curved truss with a so-called hollow shape, it is necessary to obtain a lattice that corresponds to the curved state because the lattice consists of a sawtooth shape with continuous peaks and valleys, and in order to obtain such a lattice. The problem was that the machining accuracy of the lattice had to be increased, and machining was time-consuming.

Therefore, we proposed a truss whose end face is shown in Figure 14 and a partially enlarged view is shown in Figure 15. This truss (61) has a lattice (
65) is placed between the upper reinforcing bar and the lower reinforcing bar (66), and both ends are fixed by welding. That is, the lower reinforcing bars (66) are surrounded and fixed at appropriate positions with reinforcing bar joints (67) as shown in FIG.
A rising piece (68) was raised from the upper end of 7), and the tip of the lattice (65) was fixed there by welding.

However, such a truss (61) has a rising piece (
68) and the welded part of the lattice (65) or the lower reinforcing bar (66)
The problem was that there were cases where the strength was limited due to deviation from the axis of the shaft.

(Means for solving the problem) The upper reinforcing bars are interconnected by a reinforcing bar joint having a hole in the middle, and the lattice is bent at the middle part and the tip of the image is inserted and fixed into the hole of the adjacent reinforcing bar joint. , a truss characterized by comprising a lower reinforcing bar fixed to the outer peripheral surface of the bent part of the lattice, and a process of connecting the upper reinforcing bars to each other by a reinforcing bar joint having a hole in the middle, the middle part being bent. The process of fixing the lattice to the reinforcing bar joint that is fixed to the upper reinforcing bar by inserting the image tips of the lattice into the holes of the adjacent reinforcing bar joints, and fixing the outer peripheral surface of the bent part of the lattice to the corresponding surface of the reinforcing bar joint. The present invention relates to a method for manufacturing a truss characterized by a step of fixing lower reinforcing bars, and a truss and a method for producing a truss in which a reinforcing bar joint is fixed to a portion where the lower reinforcing bar is fixed to a lattice.

(Function) The process of connecting the upper reinforcing bars with each other using a reinforcing bar joint with a hole in the middle, inserting the edges of the lattice whose middle part is bent into the holes of the adjacent reinforcing bar joints, and fixing the reinforcing bars to the upper reinforcing bar and the lattice. The outer peripheral surface of the bent part of the lattice is fixed to the corresponding surface of the reinforcing bar joint, thereby fixing the lattice and the lower reinforcing bar, which are interconnected by a reinforcing bar joint with a hole in the middle. A truss is obtained that consists of an upper reinforcing bar, a lattice whose middle part is bent and whose edges are inserted and fixed into the holes of adjacent reinforcing bar joints, and a lower reinforcing bar which is fixed to the outer peripheral surface of the bent part of the lattice. . By the method of manufacturing a truss in which a reinforcing bar joint is fixed to a part of a lower reinforcing bar fixed to a lattice, a truss in which a reinforcing bar joint is fixed to a part of a lower reinforcing bar to be fixed to a lattice can be obtained.

In these trusses, each unit lattice is fixed to the upper reinforcing bar and the lower reinforcing bar, so it can flexibly respond to changes in the shape of the truss.

Furthermore, the bent portion of the lattice can be fixed to the lower reinforcing bar directly below it.

(Example) Below, lower reinforcing bars (3
Figure 4 shows a perspective view of 1), Figure 1 shows a perspective view of the mold used to manufacture the lower reinforcing bar (31) used in the truss of the present invention, Figure 2 shows a cross section of the same processed state, This will be explained according to Figure 3.

(1) is a reinforcing bar joint crimping device. (2) is a reinforcing bar joint crimping device (a suppressing type that is fixed to the - of the crimping end of 11).
Type 2 (3) is a lower mold which is a pressing mold that is fixed to the other crimping end of the reinforcing bar joint crimping device [1]. Both molds have approximately equal machined surfaces. The reinforcing bar joint crimping device (1) is attached to the upper mold (2
) has a hydraulic cylinder (not shown) at the top of the
The upper mold (2) can be raised and lowered to a position where it can come into contact with the lower mold (3), and has an output of 30 to 150, preferably 50 to 100.

(4) and (4)' are deep curved grooves drilled in the machined surfaces of the upper mold (2) and lower mold (3), respectively; (5) and (5)
° is a shallow curved groove drilled on the machined surfaces of the upper mold (2) and lower mold (3), and the deep curved groove (4) (4)' and the shallow curved groove (5) (51') are from both. Groove (6)
(The holes are drilled alternately in the longitudinal direction of 61'.

In this embodiment, there are four shallow curves # in the groove (61 (61')
(5) +5) ' was drilled and a deep curved groove (4) (
4) ' consists of three deep curved grooves (4) (4)
The number of ' is 1.2.5.8 depending on the length of the groove (6).
etc., in which case the shallow curvature N (5) (
5) The number of ' is 2.3.6.9.

Deep curved groove (4), (4)', shallow curved 11f+5
1, (5) The circumferential surface of ' consists of a circular circumferential surface or an elliptical circumferential surface. Deep curved grooves (4), (4)' and shallow curves*
(51, (5) The widths a and b of ' are almost equal in this example, but a and b may be a<b, but a=b or a
>b is desirable.

Deep curved grooves (4), (4)', and shallow curved # (5
) and (5)' may have different widths of the grooves.
7), (7).

is a reinforcing bar joint end restraining portion, which closes both longitudinal ends of the groove portions (6) and (6)° in a rising shape.

(8) is a side groove, which is 0.1 to 5.0+++g+ from the machined surface along both longitudinal sides of the groove (6) and (6)°.
Drill in a strip at a depth of .

(9) is a reinforcing bar joint, and (10) is a reinforcing bar. Rebar (10
) in this embodiment is made of deformed reinforcing bars having ribs and edges, and in the processing of this embodiment, two are connected in the longitudinal direction.

Therefore, a sleeve tube inserted into the reinforcing bar (10) in the groove (6)° of the lower mold (3) or an end portion (12) at the upper side is provided.
A reinforcing bar joint material (14) made of a steel plate having a U-shaped cross section and a curved surface (13) is placed on the lower part. The reinforcing bar joint material (14) only needs to have a curved surface, and the cross section may be in a 7-shape shape, but it is desirable that the processed upper end (12) faces slightly inward. The interval between both ends (12) is wider than the outer diameter of the reinforcing bar (10), and in that case, the reinforcing bar joint material (14) must be inserted into the reinforcing bar (lO) from the end of the reinforcing bar (10). Instead, it can be inserted directly into the required location from the side of the reinforcing bar (10). Next, in FIG. 3, which shows the cross section of the lower reinforcing bars used in the truss of this example, the upper die (2) is inserted into the reinforcing bars (10) at a time almost perpendicular to the longitudinal direction of the reinforcing bars (10). Descend in the direction. As the upper die (2) descends, the surface of the reinforcing bar joint material forms a deep curved groove (4) due to the frictional force and shear force between the surfaces of the reinforcing bar joint material (14) and deformed reinforcing bars (10).
, (4)° toward the circumferential surface and the reinforcing bar joint end restraining portion (7). However, the relief of the reinforcing bar joint material (14) is due to the deep curved groove (4), the (4)° circumferential surface, and the reinforcing bar joint end restraint area (
7), the reinforcing bar joint material (14) is prevented by reinforcing bar (1).
0) stick, rib? To provide a reinforcing bar joint (9) in which two reinforcing bars (10) are crimped together. At the same time, during this crimping process, the reinforcing bar joints (men have shallow curved grooves) (51 (51',
Because it is pressed by the deep curved grooves (4) (4)', the outer circumferential surface of the reinforcing bar joint (9) is deeply curved in a direction that intersects with the longitudinal direction, in this example, in an approximately right angle direction, as shown in Fig. 4. Clear edges (15) according to the number of grooves (41 (4)
) to form. Also, because it is pressed by the side groove, the reinforcing bar joint (
9) To provide simply and quickly a reinforcing bar joint and a lower reinforcing bar (31) of a truss having a clear rib (16) in the longitudinal direction of the outer circumferential surface.

Figure 5 shows a groove section (6) (6>') in which two grooves are provided parallel to each other in the longitudinal direction, and a central groove (11) is formed between the two grooves on the same plane as the side grooves (8). , is a perspective view of a mold used for the upper reinforcing bar (21) used in the truss according to the embodiment of the present invention.In this embodiment, the groove (6) of the lower mold (3) is
A reinforcing bar joint material (14) consisting of a sleeve tube into which two reinforcing bars (10) are fitted in parallel or a steel plate having a W-shaped cross section with an end at the top and a curved surface at the bottom is placed. In the center of the reinforcing bar joint material (14), two holes (17) are bored side by side in the longitudinal direction of the reinforcing bar (10), as shown in FIG. The reinforcing bar joint material (14) only needs to have a curved surface, and if a steel plate is used, it is desirable for the ends to face slightly inward for processing reasons. The width between the ends is wider than the outer diameter of the reinforcing bar (10), and in that case, it is not necessary to insert the reinforcing bar joint material (13) into the reinforcing bar (10) from the end of the reinforcing bar (JO);
10) can be inserted directly into the required location from the side. Next, as is clear from FIGS. 6 and 7, which sequentially show cross sections in the processed state, the upper die (2) is lowered at once toward the reinforcing bars at a substantially right angle to the longitudinal direction of the reinforcing bars (lO).

As the reinforcing bar joint material (14) and the reinforcing bar (
IQ) Surface friction and shear forces cause the reinforcement joint material (
I4) The surface is pressed toward the deep curve WIt (4) (4) ' peripheral surface and reinforcing bar joint end restraint part (7). However, the relief of the reinforcing bar joint material (14) is deep curved groove (4) (4
) ' and the reinforcing bar joint end restraint part (because it is prevented by force, the reinforcing bar joint material (14) is attached to the edge of the deformed reinforcing bar (10)
To provide a reinforcing bar joint (9) that is inserted into a rib and crimped to two parallel deformed reinforcing bars (10).

At the same time, during this crimping process, the reinforcing bar joint (9) has a shallow curved groove (5) (5)', a deep curved groove (4) (4)'
As a result, the outer circumferential surface of the reinforcing bar joint (9) has a clear edge corresponding to the number of deep curved grooves (4) (4)" in a direction crossing the longitudinal direction, that is, in this embodiment, in an approximately right angle direction. (15).Also, since it is pressed in the lateral direction, there are clear protrusions and ribs (16) on the longitudinal outside of the reinforcing bar joint (9).
has. And a reinforcing bar joint (9) as shown in Fig. 8,
And the upper reinforcing bars (21) of the truss can be provided simply and quickly.

By increasing or decreasing the distance between the two reinforcing bars (10), that is, the width of the central groove (11), deformed reinforcing bars with various distances between the two reinforcing bars (10) can be provided.

When the reinforcing bar joint (9) is configured like this, the reinforcing bar (10)
The crimp strength between the reinforcing bar joints (9) is increased, and the mechanical adhesion strength is no different from that of the surface of the deformed reinforcing bars (10), so that it can be used for concrete construction reinforcing bars and truss reinforcing bars. Therefore, since a non-sealed type is used in the manufacturing process, continuous work such as swaging is not required, and the product can be obtained in one operation, and not only pipe materials and sleeve tubes but also plate-shaped bodies with ends can be used as reinforcing bar joint materials. This makes it possible to crimp and fix the reinforcing bar joint material to the outer periphery of the reinforcing bars, especially deformed reinforcing bars, while providing the necessary strength. Reinforcing bars (10) when using a plate-like body with ends
It is now possible to directly fit the reinforcing bar joint material (13) into the device location of the reinforcing bar joint from the side, and there is no need to fit it from the end of the reinforcing bar unlike in conventional reinforcing bar joints using sleeve pipes, which simplifies the work. , does not require a large work area.

(41) is a lattice used in the truss of the present invention, each having a dogleg shape as shown in FIG. Both ends (42), (42) of the lattice (41) are connected to adjacent reinforcing bar joints (9), (9) fixed to the upper reinforcing bar (21).
They are inserted into the inner holes (17), (17) drilled in the hole (17), respectively, and welded to the contact area with the periphery of the hole (17). The lower outer peripheral surface of the bent portion (43) of the lattice (41) is welded to the reinforcing bar joint (9) of the lower reinforcing bar (31). Upper reinforcing bar (21
) and the lower reinforcing bar (31) may be used upside down.

As shown in FIG.
), the lattice (41) is sequentially fixed to the lower reinforcing bar (31) in the same manner.

(Effects of the Invention) Therefore, in this invention, the step of connecting the upper reinforcing bars to each other by a reinforcing bar joint having a hole in the middle is to insert both ends of the lattice whose middle part is bent into the holes of the adjacent reinforcing bar joints, and to connect the upper reinforcing bars to each other. The process consists of fixing the reinforcing bar joint and the lattice to be fixed, and fixing the outer peripheral surface of the bent part of the lattice to the corresponding surface of the reinforcing bar joint, thereby fixing the lattice and the lower reinforcing bar. Upper reinforcing bars are interconnected by joints, and lattices are bent at the middle and both ends are inserted and fixed into the holes of adjacent reinforcing joints.
A truss consisting of lower reinforcing bars fixed to the outer peripheral surface of the bent portion of the lattice can be easily obtained. Moreover, since it can be manufactured with simple processing operations, it can be manufactured even at construction sites. In this truss, each unit lattice is fixed to the upper and lower reinforcing bars, so it can respond flexibly to changes in the shape of the truss. Furthermore, the bent portion of the lattice can be fixed to the lower reinforcing bar directly below it, and even in a truss with a so-called hollow, the processing accuracy is high and the strength is excellent.

[Brief Description of the Drawings] Fig. 1 is a perspective view of a mold used for machining the lower reinforcing bars of a truss used in an embodiment of the present invention, Fig. 2 is a central sectional view of the lower reinforcing bars in the embodiment, and Figure 3 is a cross-sectional view of the same.
Fig. 4 is a perspective view of a lower reinforcing bar used in a truss according to an embodiment of the present invention, Fig. 5 is a perspective view of a type used for the upper reinforcing bar of a truss of this invention, and Figs. 6 and 7 are the same processed state. A cross-sectional view, FIG. 8 is a perspective view of an upper reinforcing bar according to an embodiment of the present invention,
FIG. 9 is a front view of an embodiment of the invention, FIG. 10 is an end view of the same, FIG. 11 is an enlarged view of the same part, and FIG. Figure 13a is an end view of the conventional example, Figure 13 is a front view of the same, Figures 14 and 15.
The figure is a partially enlarged view of the lattice proposed by the inventor. (1)・・・Reinforcement joint crimping device (2)・・・Upper die (3)・・・・・・
Lower mold (4) (4) '... Deep curved groove (51
(5) '... Shallow curved groove +61 (6) '
・・・・・・Groove

Claims (4)

[Claims] (1) Upper reinforcing bars interconnected by a reinforcing bar joint with a hole in the middle, a lattice whose middle part is bent and both ends are inserted and fixed into holes of adjacent reinforcing bar joints, and the bent part of the lattice. and a lower reinforcing bar fixed to the outer peripheral surface of the truss. (2) The truss according to claim 1, wherein the reinforcing bar joint is fixed to the part where the lower reinforcing bar is fixed to the lattice. (3) The process of connecting the upper reinforcing bars with a reinforcing bar joint with a hole in the middle, inserting both ends of the lattice with the middle part bent into the holes of the adjacent reinforcing bar joints, and fixing the reinforcing bar joint and the lattice to the upper reinforcing bar. A method for manufacturing a truss comprising the steps of fixing the lattice and the lower reinforcing bars by fixing the outer circumferential surface of the bent portion of the lattice to the corresponding surface of the reinforcing bar joint. (4) The method for manufacturing a truss according to claim 3, wherein the reinforcing bar joint is fixed to the portion where the lower reinforcing bar is fixed to the lattice.