KR102152471B1 - Connecting system of steel pipe strut-strip for preventing buckling - Google Patents

Abstract

The steel pipe brace-strand connection body according to the present invention comprises: a fixing band formed to surround the circumference of the steel pipe brace horizontally installed at regular intervals on the girdle of one row of the reference column of the earthing wall; Including; a structural steel pipe connecting the upper row of the upper row of the upper row of the reference row and the fixing band, wherein the fixing band is composed of a semi-circular semi-circular plate divided into two left and right, so that the steel pipe support can be wrapped. It is formed in a structure, and a first bolt connection part is formed at a point where the left and right semi-ring plates of the fixing band meet each other, and the fixing band may be closely connected to the steel pipe brace by tightening the bolts of the bolt connection part. Each end of the left and right semi-annular plates on the opposite side of the first bolt connection part extends outward, so that a support reinforcing plate is installed between the extended surface and the structural steel pipe, and the support reinforcing plate and the structural steel pipe A second bolt connection part is formed between the and, the first bolt connection part is formed under the fixing band, and the second bolt connection part is formed above the fixing band.

Description

Connection structure of steel pipe struts and strips to prevent buckling {CONNECTING SYSTEM OF STEEL PIPE STRUT-STRIP FOR PREVENTING BUCKLING}

The present invention relates to a structure for preventing buckling of a steel pipe brace, and a connection structure between a steel pipe brace and a girdle that can secure a stable buckling length that does not cause buckling for a compressive load applied to a steel pipe brace through a girdle and reinforce against the buckling load It is about.

In the underground excavation work for constructing a large-scale underground structure in a limited space in an urban area, the stability of the surrounding ground must be of the utmost priority, so when excavating the ground for the construction of the structure, soil barrier work is essential to prevent the collapse of the soil and suppress the displacement of the backside of the excavation. In the construction plan, the selection of the earth protection method occupies a very important part. The soil barrier construction method can be divided into two main methods: a method of utilizing a temporary earth structure and a method of constructing an underground structure in parallel with the excavation work, and the structure acts as a wall in response to earth pressure and water pressure. There is a risk of collapse of the tent structure due to the possibility of inducing civil complaints and stability problems of the surrounding ground, and there are many cases of actually collapsed. In addition, there are a number of cases in which civil complaints occur due to displacement of the surrounding ground, resulting in suspension of construction or compensation for civil complaints.

Temporary facilities used for earthwork in the current earthworks are steel piles and earth plates, or CIP (Cast in Place Wall), SCW (Soil Cement Wall), etc. are used, and the type of supporting earthwork is supported by the conventional temporary strut. There are two ways to do it and to support it with Earth Anchor, Soil Nailing, Rock Bolt and Top-Down method.

Among them, if a temporary strut is used, there is a high possibility of causing an increase in air due to the installation and dismantling process of the temporary material, and a change of the surrounding ground when dismantling, but the working environment during underground construction is relatively good compared to the Top-Down method. It has the advantage of reducing the cross section of the slab and is currently widely used.

In addition, as a support beam, in recent years, there are weak shafts and strong shafts, and instead of H-Pile, which requires reinforcement for the weak shafts when designing buckling against the compressive load transmitted from the soil wall through the strip, circular steel pipes or square sections with symmetrical sections The square tube of is widely used.

In general, H-beams have a strong shaft and a weak shaft due to structural characteristics, but when used as a compression member such as a support beam, it is disadvantageous to buckling in the weak shaft direction. In order to reinforce this, reinforcing materials such as bracing that interconnect the braces should be used in parallel. However, such a reinforcing material is concerned about safety accidents when installing and dismantling workers, and it is difficult to secure a work space, which causes delays and increases construction costs.

Therefore, it is desirable to apply a high-strength steel pipe brace, which is advantageous in structural safety and economics, and a high-strength steel pipe brace construction method, which is advantageous for workability and construction time of temporary facilities and structures. High-strength steel pipe support has a structural cross section that is advantageous for buckling and torsion because there is no distinction between strong shaft and weak shaft because there is no direction because circular steel pipe is used. In addition, since horizontal and vertical bracing is not required, construction cost, construction period, and constructability (installation/dismantling of braces, ground excavation, construction of the main structure) are relatively superior to H-beams.

The steel pipe brace is called a brace, but in reality it behaves as a compressive material (column) rather than a horizontal member (beam, girder), and thus, the stability of the member may be greatly damaged due to occurrence of buckling or the like.

The method of applying high-strength steel pipe struts tends to have higher buckling stress than the method of H-beam, but it is important to secure the buckling length to increase the stability of the structure to prevent buckling. There are two ways to secure the buckling strength of the steel pipe strut member: reinforcing the cross section of the member itself and a method of reducing the fine equipment. However, strengthening the cross section of the member itself is limited in terms of sectional efficiency, so it is desirable to reduce the fine equipment. In order to reduce the slenderness, there may be a method of shortening the length of the brace itself, a method of installing a central pile that serves as a point in the middle of the brace, and a method of increasing the point binding force at both ends of the brace.

However, in the case of the method of reducing the length of the support beam itself, it cannot be used in general due to large restrictions on the design and construction conditions, and the installation of a central pile cannot be an essential solution. There is a problem that workability is deteriorated due to the narrow working space, and in the case of simply increasing the point binding force at both ends of the brace, there is a problem that it is not easy to connect the circular steel pipe braces to each other and to the girdle.

In addition, a technology to prevent sagging by connecting the strip and steel pipe struts through wires has been proposed, but the technology to prevent sagging through wires cannot be reflected at all in calculating the effective buckling length when designing the buckling of the struts. There is a problem that it is not enough to prevent it.

Korean Patent Registration No. 10-0733720

In the case of using steel pipe struts as a strut, steel pipe struts may not sufficiently support the temporary wall as buckling occurs in the steel pipe struts as a compressive material, and there is a risk of collapsing. It is required to develop a structure that can secure a stable buckling length.

In addition, in addition to the lateral pressure transmitted from the earth wall through the strip, the steel pipe struts take both the top moment due to the self-weight and construction load of the member itself.In addition to buckling prevention, in response to such a top moment, the deflection of the steel pipe strut is effectively prevented. You need a structure that can do it.

The steel pipe brace-strand connection body according to the present invention comprises: a fixing band formed to surround the circumference of the steel pipe brace horizontally installed at regular intervals on the girdle of one row of the reference column of the earthing wall; Including; a structural steel pipe connecting the upper row of the upper row of the upper row of the reference row and the fixing band, wherein the fixing band is composed of a semi-circular semi-circular plate divided into two left and right, so that the steel pipe support can be wrapped. It is formed in a structure, and a first bolt connection part is formed at a point where the left and right semi-ring plates of the fixing band meet each other, and the fixing band may be closely connected to the steel pipe brace by tightening the bolts of the bolt connection part. Each end of the left and right semi-annular plates on the opposite side of the first bolt connection part extends outward, so that a support reinforcing plate is installed between the extended surface and the structural steel pipe, and the support reinforcing plate and the structural steel pipe A second bolt connection part is formed between and, the first bolt connection part is formed below the fixing band, and the second bolt connection part is formed above the fixing band.

Another steel pipe brace according to the present invention-band joint includes a fixing band formed to surround the circumference of a steel pipe brace that is horizontally installed at regular intervals in one row of a reference row of the earthing wall; Includes; a structural steel pipe that connects between the band length of the lower row located below the reference row and the fixing band, wherein the fixing band is composed of two semicircular semi-circular plates separated from the left and right to wrap the steel pipe brace. A first bolt connection part is formed at a point where the left and right semi-ring plates of the fixing band meet each other, and the fixing band may be closely connected to the steel pipe brace by tightening the bolts of the bolt connection part, Each end of the left and right semi-annular plates on the opposite side of the first bolt connection part extends outward, so that a support reinforcing plate is installed between the extended surface and the structural steel pipe, and the support reinforcing plate and the structural steel pipe A second bolt connection part is formed between the steel pipe, the first bolt connection part is formed above the fixing band, and the second bolt connection part is formed below the fixing band.

In the steel pipe strut-belt joint according to the present invention as described above, two structural steel pipes may be installed between the fixing band and the strap.

In the steel pipe brace-strand connection body according to the present invention as described above, the structural steel pipe, the upper row belt length or the lower row belt length to which the structural steel pipe is connected, and a vertical square steel pipe and a horizontal square steel pipe supporting between the fixing bands are additionally added. Can include.

In the steel pipe brace-strand joint according to the present invention as described above, a support tool for supporting the girdle may be additionally included under the girdle.

In the steel pipe brace-strand connection body according to the present invention as described above, a separate supporting reinforcing plate may be installed between the upper row or lower row belt to which the structural steel pipe is connected and the structural steel pipe.

The method of connecting a steel pipe brace according to the present invention includes the steps of: installing one row of braces per steel pipe brace on a retaining wall, installing a steel pipe brace connected to the first row of braces, formed to surround the circumference of the steel pipe braces. And installing a fixing band, and installing a structural steel pipe connecting the band length and the fixing band.

In the connection method of the steel pipe brace-strand according to the present invention, the fixing band is formed in a structure capable of wrapping the steel pipe brace by consisting of a semi-circular plate of a generally semicircular shape separated by two left and right, the fixing band of the A first bolt connection part is formed at a point where the left and right semi-annular plates meet each other, and the fixing band may be closely connected to the steel pipe brace by tightening the bolts of the bolt connection part, and the left and right sides of the opposite side of the first bolt connection part Each end of the semi-annular plate extends outward, so that a support reinforcing plate is installed between the extended surface and the structural steel pipe, and a second bolt connection is formed between the support reinforcing plate and the structural steel pipe. The first bolt connection part may be formed below the fixing band, and the second bolt connection part may be formed above the fixing band.

In the connection method of the steel pipe brace-strand according to the present invention, the fixing band is formed in a structure capable of wrapping the steel pipe brace by consisting of a semi-circular plate of a generally semicircular shape separated by two left and right, the fixing band of the A first bolt connection part is formed at a point where the left and right semi-annular plates meet each other, and the fixing band may be closely connected to the steel pipe brace by tightening the bolts of the bolt connection part, and the left and right sides of the opposite side of the first bolt connection part Each end of the semi-annular plate extends outward, so that a support reinforcing plate is installed between the extended surface and the structural steel pipe, and a second bolt connection is formed between the support reinforcing plate and the structural steel pipe. The first bolt connection part may be formed above the fixing band, and the second bolt connection part may be formed below the fixing band.

In the method of connecting a steel pipe brace-strand according to the present invention, a part or all of the girdle may be formed by two rows of an upper and a lower girdle.

According to the present invention, the effective buckling length of the steel pipe strut is reduced, so that the slenderness can be reduced.

In addition, according to the present invention, the point restraint between the steel pipe strut and the belt length to which the steel pipe strut is connected can be strengthened.

Accordingly, the buckling strength of the steel pipe struts acting as a compressive material can be increased.

In addition, in the present invention, a structural steel pipe is used to connect the girdle and the steel pipe brace, and because the structural steel pipe is a member that can be supported by itself and is not a member that cannot be supported by itself such as a wire, it is simply prevented from sagging of the steel pipe brace. Rather, the steel pipe brace-strand connection body of the present invention through the structural steel pipe can serve as a point of the steel pipe brace, thereby reducing the effective buckling length of the steel pipe brace.

In addition, the existing method of using a wire fixes the wire to the pile, so the change in length does not vary, but according to the present invention, the length adjustment can be flexible because it can be fixed to both the strip length/pile and consequently the effective buckling length You can increase your choice of.

In addition, in the present invention, when a structural steel pipe is used as a compression member, various types of connection methods are proposed to reduce the length thereof, so that application examples are broadened in design and construction.

In addition, since more than one structural steel pipe, for example two, can be used in one fixing band, it is possible to simultaneously solve the problem that the structural steel pipe itself is too long to reduce the effective buckling length of the steel pipe brace. Since it is possible to support the structural steel pipe in both the and the lower part, it is more advantageous to reduce the effective buckling length of the steel pipe brace and the length of the structural steel pipe.

Conventional buckling reinforcement technology requires an excessive reinforcement cross section and has a problem of securing a binding force with a member receiving compression force, but the present invention is easy to install and dismantle at a high place, and an excessive reinforcement cross section is unnecessary. , You can secure enough cohesion.

In addition, the connection body of the steel pipe strut-band of the present invention can be bolted together to solve the problem of the welding joint used in the past and improve the recovery rate of the member, and it is installed by a bolt-nut connection method with a structural steel pipe. It is possible to provide a fixing structure that is simple and sturdy, and is easy to replace when the steel pipe is damaged.

1 is a view showing an embodiment of a connection structure of a steel pipe strut and a strip for preventing buckling according to the present invention.
Figure 2 is a view showing another embodiment of the connection structure of the steel pipe strut and strip for preventing buckling according to the present invention.
3 is a view of an embodiment showing that the connection structure of the steel pipe brace and the girdle according to the present invention are installed when the steel pipe brace is connected to the structural steel pipe connected to the upper row girdle.
Figure 4 is a view showing that two structural steel pipes are connected to the fixing band according to the present invention.
5 is a view of another embodiment showing that the connection structure of the steel pipe brace and the girdle according to the present invention is installed up and down when the steel pipe braces are all connected to each of the structural steel pipes connected to the upper row belt and the lower row belt.
6 is a view for explaining a case where only one structural steel pipe is connected to the fixing band.
Fig. 7 is a view for explaining a first form of connection of a structural steel pipe between a steel pipe brace and a belt length.
Fig. 8 is a view for explaining a second form of connection of structural steel pipes between steel pipe struts and strips.
Fig. 9 is a view for explaining a third mode of connection of structural steel pipes between steel pipe struts and strips.

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

In the present specification, the same or similar reference numerals are added to elements corresponding to each other.

In the present specification, when describing the directions such as up, down, left and right, in principle, it is based on the same as shown in the drawings, and may be different for convenience according to the description. In the present specification, terms such as “one side” and “the other side” are used to refer to different sides among several sides, and the parts described as “one side” or “the other side” in some parts according to the purpose of description are reversed in other parts. It can also be described as "other side" or "one side". In addition, in the present invention, expressions such as "vertical", "orthogonal", and "inclined" refer to members (steel pipe braces, etc.) that are in principle, but may be different for convenience.

In the present invention, "direct connection" means that two members are directly connected without a separate member in the middle, and "indirect connection" means that the two members are connected through a separate member in the middle. Therefore, the meaning of "direct or indirect connection" includes both members that can be connected without an intermediate member or by using a separate member.

An embodiment of a connection structure of a steel pipe strut and a strip for preventing buckling according to the present invention will be described with reference to FIG. 1.

As shown in Fig. 1, the steel pipe struts 1 extend left and right in a direction orthogonal to the pile 3 such as CIP for supporting the lateral pressure such as earth pressure and water pressure of the earth wall during the underground earthing construction, and a predetermined distance vertically It is indirectly connected to the strip (2a, 2b, 140) in which a plurality of is installed, through a steel pipe-band connector 5 composed of a tubular connector inserted and connected to a separate steel pipe support.

A fixing band 10 is installed to surround the circumference of the steel pipe brace 1 at a location where the steel pipe brace 1 is separated from the connection point of the girdle 2a, 2b, and the fixing band 10 is a steel pipe It is connected to another strip (140) by the support-band joint (100).

In the present specification, the steel pipe support (1) is connected to a band arranged in several rows up and down along the pile (3), for the purpose of explanation, any one steel pipe support (1) and a fixed band (10) connected to the steel pipe support The column in which is located is called the reference column, the column above the reference column is called the upper column, and the column located below it is called the lower column.

Therefore, it is described that the band length 140 is positioned in the upper row when the band length 2a is positioned in the reference row, and another band length 2b exists in the lower row below the reference row.

The strip (2a, 2b) in FIG. 1 is referred to as a two-stage strip in this specification, which is a strip that is located in the reference row of one steel pipe support (1), but is attached to two rows, and FIG. 3 , In Fig. 9, a two-stage strip is used, whereas in Figs. 2, 5, 7, and 8, a first-stage strip is used.

The connector 100 connects the belt length 140 and the fixing band 10 to indirectly connect the steel pipe support 1 to the belt length 140. The connector 100 includes a rectangular steel pipe that extends vertically downward from the belt length 140 as shown in FIG. 1 and then extends in the lengthwise direction of the steel pipe support beam 1 as a whole and has a "b" shape as a whole. A vertical square steel pipe that extends vertically downward from the belt length 140 is referenced 130, and extends horizontally from the vertical square steel pipe 130 toward the fixing band 10 in the longitudinal direction of the steel pipe support (1). The horizontal square steel pipe that is used is indicated by the reference number 120. Of course, members other than square steel pipes may be used as members 120 and 130, but in general, a square steel pipe having a hollow cross-section is advantageous in terms of member sectional efficiency and weight reduction. A support reinforcing plate 150 is installed between the vertical square steel pipe 130 and the strip 140, and a support reinforcement plate 160 is also installed between the horizontal square steel pipe 120 and the fixing band 10. The support reinforcing plate (150, 160) is a connection between the rectangular steel pipe (120, 130) and the band (140) and the fixing band (10), and the band (140) and the fixing band (10) It is welded or bolted between the square steel pipes 120 and 130.

A structural steel pipe 110 is connected to one end to which the belt length 140 of the vertical square steel pipe 130 is connected and one end to which the fixing band 10 of the horizontal square steel pipe 120 is connected, so that the vertical square steel pipe as a whole ( 130), horizontal square steel pipe 120, structural steel pipe 110 form a triangular shape.

In addition, the vertical square steel pipe 130 and the structural steel pipe 110, the horizontal square steel pipe 120 and the structural steel pipe 110 are advantageous in terms of member recovery rate, but are not necessarily limited to bolt coupling. Weld bonding or the like can also be used.

Here, the recovery rate of the member is a steel pipe brace, a joint material of a steel pipe brace, and a steel pipe brace as in the present invention-the connection body 100 of the girdle in the construction using the steel pipe brace in which the present invention is used. When completed, it is disassembled and then recycled again, and it should be possible to reuse normally by minimizing damage to the cross-section of the member during repeated installation and disassembly, which is a very important index in showing the reusability of such a member.

When the square steel pipes 120 and 130 are not used, as in other embodiments described below, the structural steel pipes 110 are respectively provided through the support reinforcing plate 150 and the support reinforcing plate 160. It is connected to 140 and the fixing band 10.

As described above, in FIG. 1, the belt lengths 2a and 2b connected to the steel pipe support 1 are in two stages, and as can be seen in FIG. 3, the upper belt length 2a is the steel pipe support 1 It is connected to, and the lower strip (2b) connected to the bottom of the upper strip (2a) is installed on the steel pipe support (1) of the lower row of the steel pipe support (1) of the reference row connected to the upper strip (2a) The vertical square steel pipe 130 connected to the fixed band 10 and the structural steel pipe 110 are connected. However, as can be seen in FIG. 3, in the case of the uppermost belt length 140, the steel pipe support 1 is no longer installed thereon, so in this case, the reference numeral 140 is used to distinguish it. It is similar to the strip (2b). Therefore, in the lower belt (2b) and the belt (140), a support (4) as in FIG. 1 is installed to more firmly couple and support them to the pile (3), and the support (4) is It is connected to the pile (3) while supporting (2b, 140) from below.

Meanwhile, the square steel pipes 120 and 130 of FIG. 1 are for reinforcing while connecting the strip and the structural steel pipe 110, and as described below, two or more structural steel pipes 110 are used, or one steel pipe support ( 1) In the case where the structural steel pipe 110 is connected to both the upper or lower part to reduce the effective buckling length of the steel pipe strut 1 and to reduce the length of the structural steel pipe 110, the structural steel pipe 110 itself is applied. Since the load or the displacement occurring in the structural steel pipe 110 is reduced, reinforcement through the square steel pipes 120 and 130 may not be performed as in FIG. 2 or the like.

When the connection structure of such a steel pipe brace and a girdle is used, the connection body 100 acts as a kind of claw foot (ear catcher) and the effective span (effective buckling length) of the steel pipe brace between the girdle and the girdle, or in FIG. As described above, when the central pile 6 is installed in the span of the steel pipe strut 1, the effective span between the strip lengths 2a and 2b and the central pile 6 decreases, thereby substantially reducing the slenderness. In addition, the connecting body 100 also increases the binding force to the point of the steel pipe strut 1, so that the buckling strength of the steel pipe strut 1 can be expected to increase due to the decrease in slenderness resulting from this.

In addition, in this way, the connection body 100 may partially load a load vertically loaded in the longitudinal direction of the steel pipe brace 1 in a row other than the reference row of the steel pipe brace 1, for example, the upper row or the lower row belt length ( 140), so it helps to prevent sagging due to such vertical load of the steel pipe support (1).

Referring to FIG. 2 showing another embodiment of the connection structure of the steel pipe strut and the strip for preventing buckling according to the present invention (FIG. 2 is shown in a perspective view unlike FIG. 1, and is an embodiment in which a square steel pipe is not used), The connector 100 according to the present invention may connect the fixing band 10 and the strip 140 only by the structural steel pipe 110 without using a separate "b"-shaped square steel pipe 120 and 130, and the steel pipe Only one row of bands 2a is connected to the support 1 and a separate lower band 2b as shown in FIG. 1 may not be used.

Referring to Figure 4, when adopting the connection structure of the steel pipe struts and bands according to an embodiment of the present invention, the connection relationship between the steel pipe struts 1, the fixing band 10, the support reinforcing plate 160, and the structural steel pipe 110 Explain.

The fixing band 10 of the present invention is composed of two semi-circular semi-circular plates separated from the left and right as shown in FIG. 4 to wrap the steel pipe strut 1, and the left and right semi-rings The bolt connection part 11 is formed at the point where the type plates meet each other, and the fixing band 10 may be closely connected to the steel pipe brace 1 by tightening the bolts of the bolt connection part 11. In addition, in the left and right semi-circular plates of the fixing band 10, the opposite end of the bolt connection part 11 is connected in contact with the support reinforcing plate 160, and the portion in contact with the support reinforcing plate 160 is generally A semi-circular semi-circular plate extends horizontally along the surface direction of the support reinforcing plate 160 in the outer circumference of the semi-circular shape to form a coupling surface 12 with the support reinforcing plate 160, and the support The bolt connection part 13 may be formed on the left and right between the reinforcing plate 160 and the left and right semi-ring plates of the fixing band 10.

In addition, as can be seen in Figure 4, the steel pipe strut 1 is in direct contact with the support reinforcing plate 160 at an intersection with the central axis of the cross-section of the steel pipe strut 1 between the bolt connection parts 13 do.

A bolt connection 14 between the support reinforcing plate 160 and the structural steel pipe 110 is formed. Of course, as described above, the bolt connection is a principle for increasing the recovery rate of the components of the present invention, but the use of welding or the like is not impossible, so it is of course possible to use a welding joint together if necessary.

Meanwhile, the fixing band 10 of the present invention has a bolt connection part 14 with a structural steel pipe 110 formed on the upper part as seen in FIGS. 3 and 4 and a bolt connection part for connecting the left and right semi-ring plates to each other at the lower part. (11) is formed.

On the other hand, referring to FIG. 5 showing a different arrangement of the connector 100 of the present invention, a bolt connection 14 with the structural steel pipe 110 is formed in the lower part as opposed to the fixing band 10 of FIGS. 3 and 4 There may be a fixing band 10 in which a bolt connection part 11 is formed for connecting the left and right semi-ring plates to each other. In FIG. 5, it can be seen that the two fixing bands 10 are mixed. In this way, the two fixing bands 10 are used in the case of holding the steel pipe support (1) through the fixing band 10 from above and the bolt connection part 14 in the fixing band 10 according to the case of holding it from the bottom. This is because the position of the bolt connection part 11 is different. When the fixing band 10 is used as in the position of FIG. 3, as can be seen in the enlarged view of FIG. 3, the bolt connection part 11 is at the lower part of the steel pipe brace 1, and the bolt connection part 14 is The upper part of the steel pipe support (1) is to hold the steel pipe support (1) through the structural steel pipe 110 on the steel pipe support (1) and hold it, and the structural steel pipe 110 acts as a tension member. In the opposite case, that is, as can be seen in the enlarged view of FIG. 5, the bolt connection part 11 is at the upper part and the bolt connection part 14 is at the lower part, the steel pipe support 1 is placed in the lower part of the structural steel pipe 110 As to hold by connecting to the strip through a), such a structural steel pipe 110 acts as a compression member.

As described above, in the present invention, the structural steel pipe 110 can simultaneously or selectively support the steel pipe struts 1 in the upper row and the lower row, and when the structural steel pipe 110 holds the steel pipe struts in the lower row, the structural steel pipe 110 As a compression member, a steel pipe should be designed in consideration of both compressive strength and buckling strength at the same time, which means that it cannot be long when the structural steel pipe is a compressive material as in the tension member. The factor that determines the length of the structural steel pipe is the compression member, that is, It means that it is a structural steel pipe in the lower row. In the present invention, various types of connection methods are proposed to reduce the required length of the structural steel pipe 110, so that application examples are broadened during design and construction.

In addition, the fixing band 10 may be formed with two bolt connection portions 14 symmetrically between the support reinforcing plate 160 so that the two structural steel pipes 110 can be connected as in FIG. 2 or 4. However, as shown in FIG. 6, only one bolt connection part 14 is formed and only one structural steel pipe 110 may be connected thereto.

Hereinafter, a method in which the structural steel pipes 110 are arranged between the strips 140, 2a, 2b and the fixing band 10 will be described.

In the first form, as can be seen from the lower side of Fig. 5 (the right side when the member is installed in the direction of gravity), one row of strips (2a) is used, and the steel pipe struts (1) are respectively attached to the strips (2a). Through the two structural steel pipes 110, the bolt connection 14 is connected to the fixing band 10 formed thereon. 7 is a view of a cross section connected in this way.

In the second form, as can be seen from the upper side of Fig. 5 (likely the left side when installed in the gravitational direction), a row of strips (2a) is used, and a steel pipe strut (1) is attached to the strips (2a). It is connected to the fixing band 10 through the four structural steel pipes 110, and the fixing band 10 is a type in which the bolt connection part 14 is formed on the upper side and the one formed at the lower side as described above. 8 is a view of a cross section connected in this way. This type is a method for reinforcing by increasing the quantity in order to prevent the reinforcement material from becoming excessively large when the buckling length is increased (the reinforcement material may be unstable if it is too long), and a method of supporting steel pipe struts is used together.

In the third form, as can be seen from the right side of Fig. 3, two rows of band lengths (2a, 2b, 140) are used, and the steel pipe strut 1 is connected to the upper band length (2a), and the lower band length (2b, 140) of the row above it. ) Through the structural steel pipe 110, the fixing band 10 is connected. In the case of being connected in this way, the cross-section of FIG. 9 is drawn, and when viewed from the cross-section of FIG. 9, it is as if the structural steel pipe 110 is vertically connected to the fixing band 10, but in reality, the structural steel pipe is It is inclined and connected. This form requires a separate additional strip, but is characterized by a simple structure that can minimize reinforcing materials because the steel pipe struts are reinforced in a straight line on the cross section.

The present invention as described above can provide a buckling prevention structure capable of reinforcing a buckling load by connecting the structural steel pipe 110 even if the length of the steel pipe support 1, which is a member receiving a compressive force, is lengthened.

The steel pipe brace (1) is to effectively support the earth pressure acting on the thumb pile or pile (3) to prevent the excavated soil wall from melting or collapsing, and after installing a separate sash material horizontally, the steel pipe The end of the brace 1 abuts against the side surfaces of the strips 2a and 2b and is supported and fixed.

When the advantages of the present invention are described in comparison with the prior art using wires, in the case of the method of using wires, if the spacing of the piles (H-Pile) and the spacing of the steel pipe struts are constant as shown in number ① in the figure below, There is no big problem, but if the distance between the H-Pile and the steel pipe strut is not uniform as shown in number ③ in the figure below, the connection of the wire becomes asymmetric and there is an unstable disadvantage, except that it simply prevents sagging with the wire. The buckling length of the steel pipe support (1) cannot be secured.

[Figure 1: Limits of the wire connection method according to the change in the spacing between the pile and the steel pipe support]

This is because the wire itself is a flexible material, and the coupling force (point restraint force) of the part where the wire is bonded to the steel pipe brace (1) is not strong enough to reflect the reduction in effective span. This is because the effective buckling length of cannot be reduced.

Further, since the wire is such a flexible linear member, the wire itself cannot support the compressive force at all, and thus cannot be applied when it is used as a compressive member, such as the structural steel pipe 110 of the present invention.

In addition, due to these advantages, it is natural that the deflection prevention effect of the steel pipe strut 1 is also greatly improved compared to the case of using a wire, and at least the increase in the flexural strength against the self-weight or construction load of the steel pipe strut 1 due to the point restraint Explain this.

In addition, a very complicated problem in calculating the sag prevention and effect on the structural calculation when using a wire can also be solved by the system using the structural steel pipe 110 of the present invention.

On the other hand, the present invention is a technology for reducing the buckling length of the steel pipe strut 1, rather than a sag prevention technology that prevents sagging that may occur due to a long buckling length, and the sag prevention is only a side effect obtained by reducing the buckling length. It can be said to be essentially different from the case of use.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and common knowledge in the technical field to which the present invention pertains within the scope not departing from the spirit of the present invention. Of course, various changes and modifications are possible by those who have them. In addition, in order to explain the technical idea of the present invention, the accompanying drawings are not drawn according to scale, but partially enlarged and reduced.

1: Steel pipe support
2a, 2b, 140: band length
3: stake
4: support ball
6: central stake
10: fixed band
11: Bolt connection between the left and right semi-ring plates forming a fixing band
12: Bonding surface (the side where the left and right semi-ring plates extend outward and are joined with the support reinforcing plate)
13: Bolt connection between the left and right semi-ring plates forming the fixing band and the support reinforcing plate
14: bolt connection between the fixing band and the structural steel pipe
100: connector
110: structural steel pipe
120: horizontal square steel pipe
130: vertical square steel pipe
150, 160: support reinforcing plate

Claims (12)

A fixing band formed to surround the circumference of steel pipe struts that are horizontally installed at regular intervals in one row of the reference row of the earthing wall;
Including; a structural steel pipe connecting between the band length of the upper row located above the reference row and the fixing band,
The fixing band is composed of two semi-circular semi-circular plates separated from the left and right, and is formed in a structure capable of wrapping the steel pipe brace, and a first bolt connection part at a point where the left and right semi-ring plates of the fixing band meet each other. Is formed and the fixing band may be closely connected to the steel pipe brace by tightening the bolts of the first bolt connection part,
Each end of the left and right semi-annular plates on the opposite side of the first bolt connection part extends outward, so that a support reinforcing plate is installed between the extended surface and the structural steel pipe, and the support reinforcing plate and the structural steel pipe A second bolt connection is formed between the steel pipe,
The first bolt connection part is formed below the fixing band, and the second bolt connection part is formed above the fixing band,
The structural steel pipe, the upper row strip to which the structural steel pipe is connected, and a vertical square steel pipe and a horizontal square steel pipe supporting between the fixed bands are additionally included,
The structural steel pipe is a steel pipe support-band connector, characterized in that connected to the fixing band and the horizontal square steel pipe via the support reinforcing plate. A fixing band formed to surround the circumference of steel pipe struts that are horizontally installed at regular intervals in one row of the reference row of the earthing wall;
Including; a structural steel pipe connecting between the band length of the lower row located below the reference row and the fixing band,
The fixing band is composed of two semi-circular semi-circular plates separated from the left and right, and is formed in a structure capable of wrapping the steel pipe brace, and a first bolt connection part at a point where the left and right semi-ring plates of the fixing band meet each other. Is formed and the fixing band may be closely connected to the steel pipe brace by tightening the bolts of the first bolt connection part,
Each end of the left and right semi-annular plates on the opposite side of the first bolt connection part extends outward, so that a support reinforcing plate is installed between the extended surface and the structural steel pipe, and the support reinforcing plate and the structural steel pipe A second bolt connection is formed between the steel pipe,
The first bolt connection part is formed above the fixing band, and the second bolt connection part is formed below the fixing band,
The structural steel pipe, the lower row strip to which the structural steel pipe is connected, and a vertical square steel pipe and a horizontal square steel pipe supporting between the fixing bands are additionally included,
The structural steel pipe is a steel pipe support-band connector, characterized in that connected to the fixing band and the horizontal square steel pipe via the support reinforcing plate. The method of claim 1,
A steel pipe brace-belt joint, characterized in that two structural steel pipes are installed between the fixing band and the upper row of the belt length. delete The method of claim 1,
A steel pipe brace-strand connector, characterized in that it further comprises a support tool for supporting the first row of the reference row or the upper row of the belt under the first row of the reference row or the upper row of the belt. The method according to claim 1 or 2,
A steel pipe brace-belt joint, characterized in that a separate support reinforcing plate is installed between the upper row or lower row belt to which the structural steel pipe is connected and the structural steel pipe. The step of installing one row of strips per steel pipe strut on the wall,
Installing a steel pipe strut connected to the first row of strips,
Installing a fixing band formed to surround the circumference of the steel pipe brace,
Installing a structural steel pipe connecting between the strip and the fixing band, and
Including the step of installing the structural steel pipe, the upper row strip or lower row strip to which the structural steel pipe is connected, and a vertical square steel pipe and a horizontal square steel pipe supporting between the fixing bands,
The fixing band is composed of two semi-circular semi-circular plates separated from the left and right, and is formed in a structure capable of wrapping the steel pipe brace, and a first bolt connection part at a point where the left and right semi-ring plates of the fixing band meet each other. Is formed and the fixing band may be closely connected to the steel pipe brace by tightening the bolts of the first bolt connection part,
Each end of the left and right semi-annular plates on the opposite side of the first bolt connection part extends outward, so that a support reinforcing plate is installed between the extended surface and the structural steel pipe, and the support reinforcing plate and the structural steel pipe A second bolt connection is formed between the steel pipe,
The structural steel pipe is a steel pipe brace-strand length connection method, characterized in that connected to the fixing band and the horizontal square steel pipe via the support reinforcing plate. The method of claim 7,
The first bolt connection part is formed below the fixing band, and the second bolt connection part is formed above the fixing band. The method of claim 7,
The first bolt connection part is formed above the fixing band, and the second bolt connection part is formed below the fixing band. The method according to any one of claims 7 to 9,
Part or all of the upper row strip or the lower row strip is formed of two rows of an upper strip and a lower strip. The method of claim 2,
A steel pipe brace-stranded connector, characterized in that two structural steel pipes are installed between the fixing band and the belt length of the lower row. The method of claim 2,
A steel pipe brace-strand connector, characterized in that it further comprises a support tool for supporting the first row of the reference row or the lower row of the belt under the first row of the reference row or the lower row of the belt.

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