KR200337899Y1 - truss member and temporary truss structure using the same - Google Patents

Abstract

The present invention relates to a truss member constituting a truss structure for supporting an upper structure (including formwork), such as a bottom plate, bridge girder, etc., which is installed over a multi-span or short span, hereinafter referred to as a "trusor truss". The lower chord length of the truss member is shorter than the upper chord length and the connecting gap of the lower chord can be adjusted by the spacer so that when the truss members are connected to each other, it naturally rises upward on the temporary truss (camber, CAMBER) ) Or the curvature radius is uniformly formed in the connection shape of the entire hypothesized truss member, and the bending deformation of the hypothetical truss due to the weight of the structure manufactured by the formwork without using the conventional raised system formwork Truss member capable of offsetting and provisional truss sphere using the same Relate to.

Description

Truss member and temporary truss structure using the same

The present invention relates to a truss member and a temporary truss structure using the same. More specifically, the present invention relates to a truss member constituting a truss structure for supporting an upper structure (including formwork), such as a bottom plate, a bridge girder, etc., which is installed over a multi span or a short span. In installing the temporary trusses between the sections, the lower chord length of the truss member is made shorter than the upper chord length, and the connecting gap of the lower chord can be adjusted by the spacer so that the truss members naturally rise upward when the truss members are connected to each other. (Camber, CAMBER) is formed or the curvature radius is uniformly formed in the connection shape of the overall hypothesis truss member, the hypothesis due to the weight of the structure manufactured by the formwork without using the conventional raised system formwork Truss member that can cancel the deflection of the truss and this It is related to a hypothetical truss structure.

Figure 1 shows an example of the use of the system formwork for the conventional structure for manufacturing the structure between the long term in connection with the present invention. That is, if it is necessary to install a concrete structure installed in the longitudinal direction between the lower structure (10, pier) installed at a certain distance as shown in Figure 1 hypothesis truss 20 that can support the formwork for receiving the concrete for the structure First, using a temporary vent (30, in the case of the long span) between the lower structure, install the formwork 40 on the top of the temporary truss, the concrete is placed on the formwork, curing of the form according to the shape of the formwork You will complete the structure.

As a formwork, a simple rectangular formwork can be used, but system formwork is usually used for ease of assembly and disassembly, work efficiency, and recycling according to the shape of the structure. Such system formwork pays expensive rent in Korea. It is used as a way of returning it after the completion of construction.

At this time, if the length of the system formwork (longitudinal) is to be considerably longer, the length of the hypothetical truss 20, which is supported at the bottom thereof, must also be lengthened at the same time, and the length of the hypothetical truss is the self weight of the hypothetical truss and the weight of the system formwork. And because the bending moment is generated due to the weight of the concrete to be poured, deflection may occur due to the bending deformation.

The occurrence of deflection of the hypothetical truss leads to the deflection of the system formwork supported by the hypothetical truss, which in turn may cause the self-deflection of the concrete structure and the deflection of the concrete structure by the final system form. There is a need to do it.

Therefore, in order to prevent deflection of the temporary truss, a method of adopting a member such as the cross-sectional size of the truss member constituting the temporary truss, bracing, etc. to secure sufficient stiffness to prevent the deflection phenomenon in advance during the design of the temporary truss. However, this method is a method that eventually increases the cross-sectional size of the truss member, so the manufacturing cost of the final temporary truss is inevitably high, and it is uneconomical, and its applicability is limited in recycling, and the workability such as transportation and installation is also reduced. The problem is that it must be.

In this regard, the size of the temporary truss is kept constant, and a method of installing a separate temporary vent between the substructures supporting the temporary truss so that the system formwork is supported on the substructure and the separately installed temporary vent is also used. The installation method of the vent may be added to the construction, installation and disassembly costs other than the construction cost of the temporary truss, this additional cost is a problem that is quite expensive.

However, even with the above method, the deflection of the actual hypothesis truss is not avoided along with the deflection due to the weight of the system formwork and the weight of the concrete that is later cast, and thus, the camber (up) is raised in advance to the system formwork. It is given so that the deflection can be canceled by the camber.

1 is a method for applying a camber to the system formwork by installing parallel spacers 50 such as lumber in the longitudinal direction on the bottom surface of the system formwork so that the formwork bottom surface rises with a constant curvature radius so that bending deformation of the structure occurs. It is shown how to cancel in advance. In other words, in consideration of the deflection of the hypothesis truss can be said to give an up camber to the system formwork in advance.

However, the use of a system formwork using a spacer such as a lumber is not only poor workability (because it is forced to rely on manual work), it is difficult to control the quality, and there is a problem that increases the cost of construction, The use of the spacer has a problem that precise tower treatment is not easy, such as the size of the spacer must be separately calculated according to the cross-sectional shape and length of the structure.

The purpose of the present invention is to provide a hypothetical truss by applying an upward camber to the upper structure itself or a hypothetical truss supporting the upper structure, without giving an upper camber to the upper structure (including the formwork) for forming a concrete structure formed between predetermined intervals. This is to prevent the occurrence of sag caused by the bending deformation occurring in the.

Another object of the present invention is to ensure that the rise of the required (camber) by the connection of the truss member when the truss member constituting the temporary truss can be precisely formed in the entire temporary truss.

Another object of the present invention is to be able to use a temporary truss using a truss member as a support for the structure as well as various forms.

Still another object of the present invention is to enable easy installation of the temporary truss by connecting the truss member with a simple female and male connection means in connection with the truss member.

Figure 1 shows an example of installation of a system formwork using a spacer SPACER to give an up camber to a conventional system formwork.

Figures 2a and 2b is a conceptual diagram showing the installation of the hypothesis and the longitudinal cross-sectional view of the hypothesis supporting the segment for the bridge bridge structure ILM using the structure of the subject innovation of the present invention,

3a, 3b and 3c are a plan view, a front view, a side view and a bottom view of a hypothesis truss of the present invention,

Figures 4a, 4b, 4c, 4d and 4e are respectively shown according to the position where the truss member constituting the temporary truss of the present invention is connected,

Figure 5 shows an example of the spacer connecting the lower chord of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: temporary truss

110, 110a, 110b, 110c, 110d, 110e: Truss member

200a, 200b, 200c, 200d, 200e: connection means

210a, 210b, 210c, 210d, 210e: male connection means

220a, 220b, 220c, 220d, 220e: female connecting means

300a, 300b, 300c, 300d, 300e: Spacer connecting means

400: spacer

The present invention in order to solve the above technical problems in the construction of the truss member constituting the temporary truss to naturally form the up camber required when connecting the temporary truss, each truss member is fitted to each other using a simple female, male connecting means. The top chords of the truss members are connected to each other so that rotation is not constrained like a pin connection so that a constant curvature radius is formed on the overall temporary truss by the truss members connected to each other. By forming a shorter than the length of the upper chord, by connecting the lower chords spaced apart from each other when the truss member is connected to each other by using a spacer member, it is characterized in that the upper camber of the hypothetical truss consisting of the truss member is formed, Or less truss member according to the characteristics of the present invention and this It will be described in detail as a hypothesis the preferred embodiments with reference to the accompanying drawings in the truss structure can be easily implemented by having the skilled in the art of the present invention;

Figure 2a is a pre-installed pier in order to construct a bridge of the ILM method, especially in the upper structure 500, in the process of extruding segments for ILM (usually PSC box girder) on the pier, when the segment extrusion for ILM connected to each other The construction method using a temporary truss as a kind of copper bar supporting the lower part as a schematic view, and the temporary truss 100 of the present invention is installed by using a temporary vent 200 between the piers 400, which is a substructure. , Schematically illustrates a case in which the system formwork 300 is installed on the temporary truss. In addition, in addition to the segment, structures that require support such as long bridges between temporary bridges (such as bridges, main girders), floor plates, and construction beams, the truss member and the temporary trusses of the present invention may be applied.

Figure 2b shows in more detail the longitudinal section of the temporary truss 100 supporting the system formwork 300 for manufacturing the box structure and the temporary vent 200 supporting the temporary truss.

The hypothetical truss 100 of the present invention has two sets (vertical) is installed in the longitudinal direction along the interval (L) on the three temporary vents 200 formed between the pier 400 and the pier 400 as shown in Figure 2a In each set, six pieces are installed in the transverse direction as shown in FIG. 2B according to the ILM segment width W, which is the upper structure 500, and the number of sets and hypothesis trusses installed in each set is It can be changed according to the size of the segment for the ILM, the upper structure 500 to be constructed.

3A, 3B, and 3C are diagrams illustrating the hypothesis truss 100 according to the present invention in a plan view, a front view, and a side view, and separately illustrating the hypothesis truss 100 installed between the hypothesis vents 200 of FIG. 2A. It is.

The hypothesis truss 100 is a truss member (110, 110a, 110b, 110c, 110d, 110e) is connected to each other and assembled to maintain a rectangular box shape by the central bracing material 120 as a whole in the side view of Figure 3c However, the cross-sectional shape of the hypothetical truss may be manufactured in various shapes without being limited thereto.

Since the temporary truss 100 may have various lengths according to the spacing of the temporary vents to be installed, the truss member 100 is manufactured as an assembly in which a plurality of truss members are connected in consideration of requirements such as length, cross-sectional shape, assembly and installation, and transportation. The hypothetical truss of the present invention is also assembled by using a central bracing member 120 connecting the two side truss members to each other, the side truss member is configured to include an upper chord, a lower chord and a bracing material, the hypothesis The truss member 110 of FIG. 3B formed on the side of the truss will be described with reference to FIG.

FIG. 4A shows the truss member at the position (center) indicated by a in FIG. 3B,

Figure 4b is a truss member in the position (one stage to the left relative to the center portion) indicated by b in Figure 3b,

Figure 4c is a truss member in the position (two stages to the left with respect to the center part) indicated by c of Figure 3b,

Figure 4d shows the truss member at the position (left end) indicated by d in Figure 3b,

Fig. 4E shows the truss members at the position (right end) indicated by e of Fig. 3B, but the bracing material for holding each truss member in a box shape is omitted and is shown in plan view, front view, side view and bottom view.

The truss member 110a shown in FIG. 4A is composed of an upper chord 111a, a bracing material 112a and a lower chord 113a, and the upper chord 111a is supported and connected by the bracing material 112a. The lower chord 113a is connected to the lower end of the bracing material 112a, and the upper chord, lower chord and bracing material are made of structural members such as H-shaped steel and I-shaped steel, and the connection portion of the bracing material and the shaped steel is welded or the like. Is processed.

Both ends of the upper chord 111a are formed with female and male connecting means 200a so as to be connected to the upper chord of another truss member. The female connecting means 220a is provided at the left side and the male connecting means 210a is provided at the right side. Are shown, respectively.

The male connecting means 210a is fixed so as to be in contact with each other with the two plates 211a and 212a interposed between the abdomen (indicated by A) of the H-beam constituting the upper chord 111a, and protrude slightly from the H-beam end. (Indicated by the projection P).

Through-holes 213a are formed in each plate 211a and 212a. The through-holes are also formed in H-shaped steel to insert fasteners such as pins. In this case, the forming position of the through hole is formed in a semicircular shape at the end of the H-shaped steel which is the phase current so that the final shape connected to the semi-circular through hole formed in the H-shaped steel of the other phase current is formed in a circular shape. In the case of each of the plates 211a and 212a, a through hole 213a at a position corresponding to the through hole formed in the abdomen of the H-beam is formed.

As a result, when the pin is inserted into the through hole, the pin can be formed through the abdomen of each plate and the upper chord. The reason for connecting with a pin is to prevent each connection point from being constrained to rotation in the truss member, so that the camber is formed while the curvature is naturally formed even when the up camber is connected in connecting the truss member of the present invention. .

The male connecting means 210a is fitted to the female connecting means 220a of another truss member such as formed on the left side of the truss member 100a.

The female connecting means 220a also has two plates 221a and 222a between the abdomen A of the H-beam constituting the upper chord, so as to form a space in which the other male connecting means 210a can be inserted. It is fixed to form a predetermined separation distance (denoted by M), and the end of the female connecting means 220a is also formed to protrude (denoted by P) from the H-shaped steel end. Each plate 221a, 222a is also formed with a through hole at a position and size at which a fastener such as a pin can be inserted in correspondence with the through hole of the male connecting means, and the abdomen A of the H-shaped steel where the female connecting means is formed. A semi-circular through hole is also formed in the same position and size as the abdomen of the H-shaped steel in which the male connecting means 210a is formed.

The female connecting means eventually has the function of allowing the male connecting means of other truss members to be inserted and connected to the pins, and a reinforcing plate 223a is formed at each plate 221a and 222a at opposite ends of the protruding female connecting means. Be sure to

As a result, the connecting means 200a formed at both ends of the upper chord of FIG. 4A is formed of the female and male connecting means 210a and 220a to form the female and male connecting means 210b and 220b formed on the upper chord of the other truss member 110b. ) And their respective fasteners, such as pins.

The upper chord 111a is supported by the bracing material 112a as a horizontal material. The bracing material is formed to be inclined in a zigzag manner to the lower portion of the upper chord, and the lower chord 113a to be described below is connected to the lower portion of the bracing material.

The connecting portion of the bracing material 112a and the upper chord 111a and the lower chord 113a are connected to each other in the shape of the end face according to the connecting surface. If necessary, use a reinforcement plate if necessary so that the connection is not externally affected by structural forces.

The lower chord 113a is usually formed of the same length corresponding to the upper chord 111a by the bracing material 112a. However, in the present invention, the length of the lower chord L2 is shorter than the length L1 of the top chord. do. The reason why the lower chord is formed shortly is that when each truss member is connected to form an upward camber, the upper chords are connected to each other so that rotation is not constrained, and when the lower chords are connected to each other, Shorter than the current chord without the need to adjust the current cross-sectional shape (because the lower chord is also upward, it is necessary to adjust the overall length according to the camber or to modify the cross-sectional shape according to the camber in advance). The connection is made by the spacer 400 whose length is adjusted so that the lower chord is formed to be shorter than the upper chord with a constant length according to the degree of the upward camber, and the length of the spacer is adjusted to adjust the length of the lower chord according to the upward camber. To ensure proper connection.

Therefore, both ends of the lower chord 113a need spacer connecting means so that the spacer 400 can be fitted, and the spacer reconnecting means 300a directly directly to the abdomen of the H-beam, which is the lower chord 113a. Abutment is fixed and spaced apart from the inner plate 310a and the inner plate of the two sheets formed with a through hole corresponding to the size and position of the through hole formed in the abdomen at predetermined intervals, respectively, the through hole corresponding to the through hole of the abdomen and inner plate The ball is formed of an outer plate 320a. As a result, a constant space (indicated by S) is formed between the inner plate and the outer plate, and the protrusion 420 of the spacer 400 is fitted in the space, and the through hole 430 is also formed in the protrusion of the spacer. Spacers and the ends of the lower chord are connected to each other by a fastener such as.

5 shows one specific example of the spacer 400. The body portion 410 and protrusions 420 are formed at both sides of the body portion so as to be inserted into the spacer connecting means 300 formed at the end of the lower chord, and the through hole 430 is formed in the protrusion portion.

When the length of the trunk portion 410 is adjusted in advance according to the amount of up camber (which may be determined according to the number of truss members to be connected) formed by connecting the truss member is connected to the entire truss member The lower chords of the truss members are connected to each other.

As a result, the lower chord is formed with a shorter length than the upper chord and is connected to each other according to the distance between the lower chord and the upward camber of the final chord by the spacer, so that the truss member must be manufactured in a separate shape for each member. It can be compared, unlike the arched truss member, there is no need to manufacture each truss member in a separate cross-sectional shape, it is possible to manufacture a hypothetical truss member by connecting the truss member more economical.

The truss members 110b and 110c shown in FIGS. 4b and 4c show truss members (indicated by b) connected to both sides of the truss member 110a shown in FIG. 4a.

The length of the lower chord is shorter than that of the upper chord, except that the length of the lower chord is identical to the upper chord 111b and 111c, the bracing materials 112b and 112c, and the lower chords 113b and 113c. Female and male connecting means (210b, 220b, 210c, 220c) are formed at both ends of the upper chord, and spacers (300b, 300c) are formed at both ends of the lower chord, respectively. Formed.

4D and 4E are connected to both ends of the temporary truss, and the truss members 200d and 200e, which are supported by the temporary vents at the bottom and the top thereof, are shown to the left and the right, respectively.

In the case of the truss member 200d shown in FIG. 4D, a male connecting means 210d is formed at the right end of the upper chord 111d so that the upper chord of the truss member of FIG. 4C is connected, and a plurality of H-shaped steels are connected to the left end. By forming the reinforcing member 230d as described above in the horizontal direction, the rigidity of the portion supported at the end of the temporary vent is increased. Even in the case of the lower chord 113d, a spacer connecting means 300d is formed at one end so that the lower chord of another truss member can be connected, and the other end of the bracing material is gathered and connected to the bracing material by using a plurality of reinforcing plates. Ensure that the and chords are firmly connected.

In the case of the truss member 200e shown in FIG. 4E, an arm connecting means 220e is formed at the left end of the upper chord 111e so that the upper chords of the truss member of FIG. 4C are connected, and a plurality of H-shaped steels are connected to the right end. By forming the reinforcing member 230e as described above in the transverse direction, the rigidity of the portion supported at the end of the temporary vent is increased.

In the case of the lower chord 113e, the spacer connecting means 300e is formed at one end so that the lower chord of the other truss member can be connected, and the other end of the bracing material is gathered and connected to the bracing material by using a plurality of reinforcing plates. Ensure that the and chords are firmly connected.

The truss members shown in FIGS. 4A to 4E are installed by adjusting the number of the truss members except the truss members (the truss members of FIGS. 4D and 4E) according to the length of the temporary trusses to be installed, and in the case of the spacer. The length should be changed according to the length of the truss.

The hypothetical truss completed by connecting the truss member of the present invention can accommodate various camber sizes depending on the size of the spacer connecting the lower chords without any means to give the up camber in advance. Easy to manufacture and construct, shorten the bridge construction air, and upstream camber of system formwork which is dependent on manual operation, it is very economical and efficient to use construction truss because it does not use construction accuracy and expensive system formwork compared to work This invention is possible, but the present invention provides an example used in the girder (ILM bridge segment), which is a bridge superstructure, but if the truss member supporting the structure, including the other building beams, not for the bridge rights of the present invention Of course it is included in the scope.

Claims (9)

An upper chord connected to an upper end of the bracing material and including a connecting means that is not constrained in rotation in connection with another truss member; And A lower chord connected to another truss member at a lower end of the bracing material, the lower chord being smaller than the entire length of the upper chord; Truss member comprising a. The truss member according to claim 1, wherein the bracing material, the upper chord, and the lower chord are I- or H-shaped steels, and through-holes are formed at the abdominal ends of the upper chord and the lower chord, which are I- or H-shaped steels. According to claim 1 or claim 2, The phase current connecting means for connecting other phase current connecting means so that rotation is not constrained, is a plate protruding at the end of the image current, and corresponds to the through-hole of the image current Truss member, characterized in that the through-hole is formed female connecting means or male connecting means. The method of claim 3, wherein the arm connecting means The truss member, characterized in that the plate is formed spaced apart on both sides of the upper chord to insert the plate of the male connecting means, the through-hole corresponding to the through-hole formed in the upper chord. The method of claim 3, wherein the male connecting means A truss member, characterized in that the plate is fixed in contact with both sides of the upper chord, the through-hole corresponding to the through-hole formed in the upper chord. 3. The lower chord according to claim 1 or 2, wherein the spacer connecting means is further formed at the end, the connection interval between the lower chord according to the connection interval by the spacer in the lower chord connection of the other truss member Truss member, characterized in that being adjusted. The method of claim 6, wherein the spacer connecting means An outer plate formed at both sides of the upper abdomen and having a through hole formed therein; And An inner plate formed in contact with both sides of the upper chord and formed with a through hole; It includes, the truss member, characterized in that the projection of the spacer is inserted into the separation space formed between the inner plate and the outer plate. The method of claim 7, wherein the spacer is inserted into both projections formed on both sides of the body portion in the space between the inner plate and the outer plate, the projection is characterized in that the through hole corresponding to the through hole of the inner and outer plates Truss member. A temporary truss supported by the lower structure, wherein the truss member of claim 1 is connected to each other in a box shape by using a bracing material and has an upward camber as a whole; And A structure formed on the temporary truss; And a deflection deformation of the temporary truss due to the weight of the structure and the like, wherein the structure includes at least a bridge upper structure.