KR101337001B1 - Connector assembly for steel pipe strut - Google Patents

Abstract

A joint device for a steel pipe strut to interconnect steel pipe struts in the construction of a furring strip and a strut according to the present invention comprises an upper semi-annular plate; a lower semi-annular plate to correspond to the upper semi-annular plate; joint pieces separately extended from both ends of the upper and lower semi-annular plates; a bolting part to bolt the joint pieces of the upper and lower semi-annular plates to each other; and a stress distribution plate between the upper and lower semi-annular plates.

Description

Connector Assembly for Steel Pipe Strut}

The present invention relates to a steel pipe brace and a joint device of the steel pipe brace used in the strip-belt beam construction of the underground structure.

Recently, as the necessity of expanding social indirect facilities increases, many underground excavation works are proceeding in the city center. The characteristics of the underground excavation work are the maximum space excavation and the deep depth excavation to make the best use of the close construction and the limited underground space which are close to the subway, the overpass, the underground structure, the ground structure for the office space and the residential space. have.

In particular, in the underground excavation work for constructing large-scale underground structures in the limited space of the downtown area, the stability of the surrounding ground should be the first priority. Therefore, the earthquake construction necessary for maintaining the stability of the surrounding ground must be reviewed. It is an important part. The earthquake construction method can be divided into two methods: the use of the temporary earthquake structure and the construction of the underground structure in response to the earth pressure and water pressure. Hypothetical crest structure has the risk of collapse of crest structure due to possibility of civil complaints and stability of surrounding ground, and there are many cases of actual collapse. In addition, there are many cases in which civil complaints are generated due to displacement of surrounding grounds, resulting in suspension or compensation.

The temporary facility used for the earthquake for current earthwork is steel pile and earth plate, CIP (Cast in Place Wall), SCW (Soil Cement Wall), etc. And Earth Anchor, Soil Nailing, Rock Bolt, and Top-Down.

In the case of using the temporary struts, it is highly likely to cause the increase of air and the change of the surrounding ground during the dismantling process, but the work environment for the underground construction is better than the top-down method. There is an advantage that can reduce the cross section of the slab is currently widely used.

In addition, as a brace, a circular steel pipe or a square having a symmetrical cross-section, instead of H-Pile, which has a need for reinforcement of the weak axis in the design of the buckling for the compressive load transmitted from the earth wall through the belt length in recent years. Square tube of cross section is widely used.

In the case of using the circular steel pipe or the square tube as a brace, the circular steel pipe or the square tube is welded or bolted to the belt, that is, the flange of the strip. Of course, the connecting member or reinforcing member and the belt member may be welded or bolted with a separate connecting member or reinforcing member between the belt member and the brace. In addition, since the belt or brace is a temporary material rather than a permanent structure, it is preferable to dismantle and recycle the basement block after completion of the construction.

However, if the process of disassembling after the end of construction after fastening between the band and the brace by welding and bolting method is repeated, the band and the brace are deformed and the effective area of the flange of the H-shaped steel used as the band is particularly effective. The result is a reduction, ultimately resulting in economic losses that reduce the recovery of the band.

In addition, in order to form a brace to form a long span, in order to construct and transport the brace to be cut to the appropriate length in consideration of the convenience of manufacturing and transport, it is constructed by connecting them, so to separate the steel pipe brace and steel pipe brace The joints are used. In general, there is a concern that the rigidity of the connection between the steel pipe brace and the steel pipe brace. It is also important to improve the rigidity of the connection in order to increase the recovery rate of the steel pipe because ultimately leads to cross-sectional damage of the steel pipe if the rigidity of the connection is reduced. In general, the connection part of steel pipe support is designed considering both bending strength and shear strength.

As shown in FIG. 1A, the joint of the joint and the steel pipe brace is formed by two semi-circular plates 2 and 3 of the upper and lower portions, and then the two plates (2, 3) After forming the engaging pieces 9 which extend radially and oppose each other at each end of 3), the engaging pieces 9 are connected using semi-cyclic plates 2, 3 using connecting bolts 6 such as high tension bolts. ) Will be combined. In addition, some ribs 8 are formed between the joining piece and the semi-cyclic plate to reinforce the bending strength of the joining piece 9. At this time, the semi-cyclic plate (2, 3) and the steel pipe support (1) is in contact contact with each other, because the play is generated in the contact surface is not a pure friction joint in the exact sense. Therefore, a problem of a decrease in coupling force, such as a slip between the steel pipe brace (1) and the semi-cyclic plate (2, 3) occurs.

In order to reduce the above play, when fastening a plurality of high-strength bolts 6 to the engaging piece 9 of the semi-cyclic plate (2, 3), the left and right bolts to the point by the prying action (prying action) A piece (usually the center of the joining piece) may be heard. Therefore, it is necessary to increase the design strength of the central bolt 6, that is, the tensile strength, or to reduce or disperse the reaction force Q at the points of the left and right bolts.

                 [Concept diagram of lever reaction force]

In the present invention, by strengthening the coupling force of the joint of the steel pipe support formed by the two semi-cyclic plate, while reducing the clearance between the steel pipe support and the joint device, while reducing the lever reaction force between the coupling piece and the coupling piece to further increase the rigidity of the coupling It is to provide a joint that can be increased.

Steel pipe brace for connecting the steel pipe brace and steel pipe brace used in the belt-brace construction according to the present invention, the upper semi-ring-shaped plate; A lower semi-cyclic plate formed to correspond to the upper semi-cyclic plate; Coupling pieces are formed to extend respectively at both ends of the upper and lower semi-cyclic plate; A bolt fastening portion for fastening the engaging piece of the upper semi-cyclic plate and the engaging piece of the lower semi-cyclic plate; It consists of a stress distribution plate between the upper and lower semi-cyclic plate.

In the joint apparatus, the stress distribution plate is located at both ends of the longitudinal direction of the steel tube support beam in the coupling piece, and the stress distribution plate is formed by the tensile strength of the bolt connection part, the thickness of the coupling piece, and the magnitude of reaction force generated by the lever action. Therefore, the shape and shape can be determined to be formed to prevent the lifting of the engaging piece.

In the joint apparatus, the bolt fastening hole of the bolt fastening part may be more than twice the diameter of the bolt.

Among the plurality of bolts listed in the longitudinal direction of the steel pipe support of the coupling piece in the bolted portion in the joint device, the bolt at the center may be a high-strength bolt and the bolt at the end may be a stud bolt.

The nut may be fastened to the upper and lower ends of the through bolt after the through bolt is fastened in the radial direction of the steel pipe support beam in a direction orthogonal to the extending direction of the coupling piece in the longitudinal direction.

In the joint device, the cutting bolts are fastened to the upper semi-cyclic plate and the lower semi-cyclic plate in the radial direction of the steel pipe support beam in a direction orthogonal to the extending direction of the coupling piece, but the thickness of the cutting through bolt is a steel pipe. It is determined to correspond to the length required for fastening the brace and the semi-cyclic plate, and the upper and lower cutting through bolts can be welded to the upper semi-cyclic plate and the lower semi-cyclic plate, respectively.

In the joint apparatus, the stress distribution plate may be formed to include a protrusion in which a protrusion is formed and a receiving plate in which a recess for accommodating the protrusion is formed.

In the joint apparatus, the protrusion and the receiving plate may be alternately formed on the left and right sides of the upper semi-ring-shaped plate and the lower semi-ring-shaped plate.

According to the present invention, the play between the two semi-cyclic plates and the steel tube support is reduced, thereby enhancing the bonding force due to friction bonding, and also reducing the lever action between the engaging pieces and the engaging pieces of the semi-cyclic plate to further increase the rigidity of the joint. Not only can it be made, but also the bending performance and shear performance of the steel pipe support and steel pipe support can be improved.

1a to 1e show a first embodiment of the present invention.
2a to 2e show a second embodiment of the present invention.
3A to 3D show a third embodiment of the present invention.
4a to 4e show a fourth embodiment of the present invention.
5a to 5f show a fifth embodiment of the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A to 1E showing a first embodiment of the present invention will be described. As described above, the problem of the lever reaction force can be solved when the reaction force of the lever point is dispersed as described above. For this purpose, the stress distribution plate 4 is inserted between the upper semi-cyclic plate (for example, 2) and the lower semi-cyclic plate (for example, 3). The stress distribution plate 4 is generally arranged at both ends of the entire span of the coupling piece 9 because the normal stress state is that both points of the coupling piece 9 serve as lever points. The stress distribution plate determines its shape and shape according to the magnitude of reaction force at the lever point in consideration of the tensile strength of the high-strength bolt 6 and the thickness of the coupling piece 9. On the other hand, the coupling piece 9 is to be drilled for fastening the bolt 6, the diameter of the drilling hole should be at least twice the diameter of the bolt can be expected to improve the tightening force according to the stress concentration.

Since it is installed between the semi-cyclic plate (2, 3) on the left and right sides of the stress distribution plate (4) can be arranged generally four per joint. When the stress distribution plate 4 is installed, the stress at the point is distributed over a large surface area of the stress distribution plate 4, thereby solving the problem of the lever reaction force, while the high-strength bolt 6 is tightly tightened. As the lifting phenomenon of 9) is reduced, ultimately, it is possible to expect the effect of improving the coupling force of the joint by reducing the play between the joint and the steel pipe support.

In another aspect, the problem of the lever reaction force may be solved by adjusting the tensile strength of the bolt 6 connecting the coupling piece 9 and the coupling piece 9. Therefore, among the many high-strength bolts 6 arranged in the longitudinal direction of the steel pipe support 1 in the coupling piece 9, changing the type of the bolt in the center and the bolts at both ends where the lifting occurs mainly causes problems of lever reaction force. Can be improved. 2A to 2E illustrating a second embodiment of the present invention, a central bolt 60 may use a high tension bolt, and both ends of the bolt 50 may use a stud bolt. And the high tensile bolt at the center should have higher tensile strength than the stud bolt at both ends.

Meanwhile, in the third embodiment of the present invention as shown in FIGS. 3A to 3D, the radial direction of the steel pipe support 1 in the direction orthogonal to the extension direction of the longitudinal direction of the coupling piece 9 together with the stress distribution plate 4. And tighten the nut (7) after fastening the through bolt (10). When the through bolts 10 are fastened to the steel pipe braces 1, the through bolts 10 prevent shear failure of the steel pipe braces 1, and also reduce the bending length of the connection part to obtain the effect of reinforcing the bending performance. do. To this end, the through bolts 10 are installed two or more symmetrically in the longitudinal direction of the semi-cyclic plate (2, 3). In the fourth embodiment of the present invention, the effect of strengthening the coupling force between the steel pipe support (1) and the joint device, along with the effect of improving the bending rigidity and shear stiffness between the steel pipe support (1) and the steel pipe support (1) can be expected .

However, the above-described bending performance and shear performance improvement effects of the through bolts 10 can be achieved even if the inside of the steel pipe support is a hollow cross section, even if it does not extend over the entire hollow cross section as shown in FIG. 3B or 3D. Can be designed.

Therefore, as shown in the embodiment shown in Figures 4a to 4e through-bolt bolts can be formed to correspond to the length required for the fastening of the steel pipe brace and the semi-cyclic plate, in this case, while improving the material efficiency while achieving the strength reinforcement performance can do.

However, in the embodiment of FIGS. 3A to 3D, the through-bolt 10 and the semicircular plates 2 and 3 may be drilled through the through-bolt 10 and the nut 7 in advance, but FIG. 4A. In the case of using the short through-cut bolt 70 as shown in Figure 4e, it is necessary to fix the through-cut bolt 70, as well as the outside of the steel pipe support (1). By the way, when the steel pipe brace (1) is fastened to the jointing device, since the steel pipe brace (1) becomes a closed section, construction workers can no longer work inside the steel pipe brace (1). In order to solve this problem, in the third embodiment of the present invention, the above cutting through bolt 70 is directly welded to the semi-cyclic plates 2 and 3, for example, steel bar welding. Reference numeral 80 denotes such a weld.

Or, although not shown, after drilling the through-hole at the position where the cutting through bolt 70 is to be fastened before fastening the steel pipe support 1 to the semi-cyclic plates 2 and 3, the steel pipe support 1 at the corresponding position of the through hole. ), The inner nut (not shown) may be fixed in advance by welding or the like. After the fastening the steel pipe support (1) to the semi-cyclic plate (2, 3) and then fastening the cutting through the bolt 70 in the perforated hole is the cutting through bolt 70 is coupled to the inner nut previously welded. Then, when the upper nut (not shown) is fastened, the fastening of the cutting through bolt 70 to the steel pipe support 1 is completed. Of course, it is also possible to weld the upper nut to the cutting through bolt 70 in advance.

5A to 5F showing the fifth embodiment of the present invention, the stress distribution plate according to the first embodiment is a protrusion 41 having a protrusion and a receiving plate 40 having a recess for accommodating the protrusion 41. It is characterized by the formation. In addition, the protrusion and the receiving plate 40 may be formed to be staggered at both ends of the coupling piece 9, that is, as shown in Figure 5e, for example, the receiving plate 40 on the left side of the upper semi-circular plate It is formed in (2) and the projection 41 is formed in the lower semi-cyclic plate (3), on the right side the projection (41) is formed in the upper semi-cyclic plate (2) and the lower semi-cyclic plate (3) receiving plate ( 40) may be formed. When the stress distribution plate itself is separated into the protrusion 41 and the receiving plate 40 as described above, since the stress distribution plate itself acts as a fastening part, it is possible to expect both the effect of stress dispersion and the effect of improving the tightening force. In the embodiment of Figs. 5A to 5F, unlike in the embodiment of Figs. 1A to 1E, the stress distribution plate is arranged between the bolt 6 and the bolt 6 rather than the bolt 6 fastening position, because the fifth This is because the stress distribution plate in the embodiment can itself serve as a fastening portion.

1: steel pipe support
2, 3: semi-circular plate
4: Stress distribution board
6, 50, 60: bolt
9: joining piece
10: through bolt
40: receiving plate
41: protrusion
70: cutting through bolt

Claims (8)

As a steel pipe brace joint device for connecting steel pipe brace and steel pipe brace which are used for belt-brace construction,
Upper semi-circular plate,
A lower semi-cyclic plate formed to correspond to the upper semi-cyclic plate,
Coupling pieces are formed to extend respectively at both ends of the upper and lower semi-cyclic plate,
Bolting part for fastening the engaging piece of the upper semi-cyclic plate and the engaging piece of the lower semi-cyclic plate, and
Consists of a stress distribution plate between the upper and lower semi-cyclic plate,
And a nut connected to the upper and lower ends of the through bolt after fastening the through bolt in the radial direction of the steel pipe support beam in a direction orthogonal to the extending direction of the coupling piece in the longitudinal direction. The method of claim 1,
The stress distribution plate is located at both ends in the longitudinal direction of the steel pipe support beam in the coupling piece,
The stress distribution plate is formed so as to prevent the lifting of the coupling piece is determined by the shape and shape depending on the tensile strength of the bolt connection portion, the thickness of the coupling piece, and the magnitude of the reaction force generated by the lever action. . 3. The method according to claim 1 or 2,
The bolt fastening hole of the bolt fastening portion is a steel pipe support system, characterized in that more than twice the diameter of the bolt. 3. The method according to claim 1 or 2,
Among the plurality of bolts listed in the longitudinal direction of the steel pipe brace of the coupling piece in the bolted portion, the central bolt is a high tension bolt and the end bolt is a stud bolt, characterized in that the stud bolt. delete 3. The method according to claim 1 or 2,
Fastening the through-cut bolts to the upper semi-cyclic ring and the lower semi-cyclic plate in the radial direction of the steel pipe support beam in the direction orthogonal to the extending direction of the coupling piece, respectively,
The thickness of the through-cut bolt is determined to correspond to the length required for fastening the steel pipe support and the semi-cyclic plate,
A steel pipe support system, characterized in that the upper and lower cutting through bolts are welded to the upper semi-ring plate and the lower semi-ring plate, respectively. 3. The method according to claim 1 or 2,
The stress distribution plate is a jointing device of a steel pipe supporter, characterized in that it comprises a protrusion formed with a protrusion and a receiving plate formed with a recess for receiving the protrusion. The method of claim 7, wherein
The protrusion and the receiving plate is a joint of the steel pipe braces, characterized in that formed on the left and right of the upper semi-cyclic ring and the lower semi-cyclic plate.

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