JP2013133662A - Suspension type steel-framed roof frame, and method for constructing steel-framed roof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension type steel-framed roof frame that eliminates the need for temporarily installed columns and thereby eliminating assembling and disassembling operations for them, and also does not limit roof area so as to support a roof having desired area, and a method for constructing a steel-framed roof.SOLUTION: A method for constructing a steel-framed roof includes: a first step of standing a pair of steel frame columns 1A and 1A apart in a ridge direction and standing a pair of steel frame columns 1B and 1B while putting them apart in a span direction; a second step of extending upper chord cables 2 and 2 to which two or more vertical cables 3, ..., are assembled between each pair of steel frame columns; and a third step of preparing division roof frames 4A-4E formed by dividing a steel-framed roof frame 4 with plane area sectioned with four steel frame columns in two pairs into two or more in the ridge direction, fixing the division roof frames to the vertical cables 3, ..., drooped from the upper chord cables 2 and 2 in the respective pairs, and connecting the fixed division roof frames mutually with the vertical cables 3, ..., so as to construct the steel-framed roof frame 4.

Description

  The present invention relates to a method of constructing a suspension type steel roof frame suspended by a cable or the like, and a method of constructing a steel roof by fixing a roof to a steel roof frame constructed by this method.

  It is common to build outdoor facilities such as multi-purpose halls, ball game facilities, event halls, large shopping malls, parking lots, etc. as covered outdoor facilities that are not affected by weather conditions such as wind and rain or snowfall on a relatively large outdoor site. For example, an outdoor facility having a dome-shaped roof is referred to as a “dome roof”.

  For example, in Patent Document 1, a roof steel truss constituting a large span roof is lifted by a step rod along a temporary support column and temporarily fixed to the temporary support column. After that, a construction method is disclosed in which a main pillar is erected and a large span roof is constructed by tightening the main pillar and the roof steel truss.

  This construction method requires a temporary support column to support the reaction force when lifting the roof steel truss and to support the roof steel truss over the construction period of the main column. Since the amount of steel frames can be the same as that of roof steel trusses to guarantee safety against earthquakes and typhoons, the construction cost increases due to the amount of steel frames for this temporary facility. It can be a big factor to prolong.

  In addition, in this construction method, the final chord material that constitutes the roof steel truss is taken into account when the final pillar and the roof steel truss are connected, taking into account the construction accuracy error of the main pillar and the manufacturing accuracy error of the roof steel truss. The joint parts such as the lower chord material and the lattice material are temporarily tightened, and after the main pillar and the roof steel truss are connected, they are finally tightened. In this way, the overlapping work of temporarily tightening the structural members and temporarily assembling the roof steel truss and finally tightening it finally further promotes the prolongation of the entire construction period.

  By the way, in addition to the construction method connecting the main pillar and the roof steel truss disclosed in Patent Document 1, as another method for constructing a roofed outdoor facility, a method of suspending a membrane roof with a cable as disclosed in Patent Document 2 Can be mentioned.

  This is a method in which a central suspension cable is lifted along a column, the suspension cable at the end is pulled and fixed to the foundation, and the membrane material is suspended by the suspension cable at the center and the suspension cable at the end.

  The dome roof that can be constructed by this construction method is that the roofing material is not supported by a steel frame or the like, so that the roofing material is subject to weight restrictions. Since it is necessary to stably stretch the membrane material over a long period of time, there is a problem that the roof area is often limited.

Japanese Patent No. 2928948 Japanese Patent No. 4199162

  The present invention has been made in view of the above-mentioned problems, and can eliminate the assembly and dismantling work by eliminating the need for the temporary support column, and temporarily tightening the members constituting the steel roof frame and tightening them later. It is an object of the present invention to provide a suspended steel roof frame and a method for constructing a steel roof that can eliminate the time and effort and can support a roof of a desired area without limiting the roof area.

  In order to achieve the above object, the method of constructing the suspension type steel roof frame according to the present invention includes two sets of steel columns that are set apart in the direction of the beam, and are separated in the beam-to-beam direction. The first step to be installed, the second step of bridging the upper string cable with two or more vertical cables assembled between two steel struts in each group, and the flat defined by four steel struts in two groups Prepare a split roof frame by dividing the steel roof frame of the area into two or more in the direction of girder, and fix the split roof frame to the vertical cable suspended from the upper string cable of each set, and the split fixed with the vertical cable This is a third step in which the roof frames are connected to each other to construct a steel roof frame.

  Here, “the direction of girder” means the direction from one of the two steel struts over which one upper chord cable is bridged to the other. It means a direction orthogonal to “direction”.

  In the first step, when two steel columns are erected, a pile foundation such as a steel pipe pile or PHC pile is constructed, and a steel frame of a predetermined height is placed on the foundation slab (foundation footing) supported by this pile. Make the column stand upright. In addition, as this steel-frame support | pillar, square steel, such as H-shaped steel, I-type steel, and C-type steel, a concrete filled steel tube (CFT: Concrete Filled Steel Tube), etc. can be applied.

  In this construction method, two pairs of steel struts are installed side by side. That is, before bridging the upper string cable between the steel struts, two sets (two in total) of the desired steel struts are constructed in advance. The construction procedure of the four steel struts may be a method of sequentially constructing the four steel struts, or may be constructed at the same time by putting in heavy machinery for constructing each of the four.

  After constructing two pairs of steel columns in a first step, as a second step, the upper string cable with two or more vertical cables assembled between two steel struts in each group Cross over.

  Here, the assembly of two or more vertical cables (suspension cables) to the upper string cable may be assembled in advance in a factory or on-site yard, or may be assembled on-site after standing between steel columns.

  Next, as a third step, a split roof frame is prepared by dividing a flat area steel roof frame defined by two sets of four steel columns into two or more in the girder direction.

  This steel roof frame has an arch-shaped or flat-shaped planar frame structure, a three-dimensional truss structure, etc. For example, in the case of a planar frame structure, this extends in the direction of the beam or between the beams. The girders are made up of diagonal materials to increase the in-plane rigidity of the entire frame, and the girders are made of steel frames such as square steel and steel pipes, and the diagonal materials are square steel, round bars, deformed steel bars, etc. Formed from.

  In the construction method of the present invention, two or more divided roof frames are manufactured by dividing a steel roof frame having a flat area defined by two sets of four steel columns into two or more in the direction of the beam.

  Here, “a flat area defined by two sets of four steel columns” means a flat area when the area defined by two sets of four steel columns is viewed face down, and a steel frame When the roof frame is arched, it means that the area of the curved surface along the arch is included.

  There are various ways to divide the steel roof frame into two or more in the direction of the beam, and each divided roof frame may be divided to have the same flat area, or the flat area may be divided between the center area and the end area. It may be divided differently, and an appropriate division form is set depending on construction conditions such as heavy machinery and construction space used when the divided roof frame is lifted and fixed to the vertical cable.

  For example, two girder members in the direction of girder (in the case of a steel roof frame having an arch shape, a curved girder that forms part of the arch) and the direction between two or more beams that connect the two girder members A split roof frame having a desired number of bases composed of extending girders and, for example, diagonal members that connect the girders in a cross shape, is manufactured in advance at a factory or a site yard, and prepared locally.

  The prepared divided roof frame is lifted using, for example, a heavy machine, and fixed to the vertical cable suspended from the two upper string cables, so that the divided roof frame is suspended between the two upper string cables. The

  In the third step, the split roof frame is lifted by heavy machinery and fixed to the vertical cable suspended from the two upper chord cables, and the adjacent split roof frames fixed by the vertical cable are mutually connected. Connected, “a steel roof frame with a flat area defined by two sets of four steel columns” is suspended by two upper strings.

  Here, there is no need to go through two connection steps of temporary fastening (temporary fixing) and final fastening (fixed installation) when connecting the structural members constituting the split roof frame. Furthermore, it is also possible to connect adjacent divided roof frames in a single permanent installation without temporary fixing. The “fixed installation” as used herein refers to a fixing method for obtaining a fixing strength between members required for structural design, and is not a loose aspect like temporary fixing, but a bolt is used for a predetermined fixing strength. It means fixing in a tight manner or fixing by welding.

  In the conventional construction method described above, for example, a construction method in which a steel truss frame is connected to four steel columns, so that the structural members constituting the truss frame are loosened and temporarily fixed, so that the truss frame It is intended to absorb member manufacturing errors and construction errors that become obstacles when permanently fixing steel columns. On the other hand, the construction method of the present invention employs the suspension type, so that various errors can be easily absorbed by the entire suspension structure. More specifically, when a split roof frame fixed to a vertical cable is connected to an adjacent split roof frame, there are various errors and it is difficult to connect the split roof frames at the connection position as designed. Even so, it is possible to easily align both connecting portions by slightly correcting the posture of the suspended divided roof frame.

  As for the divided roof frame adjacent to the steel column, for example, it is desirable that one end thereof is rigidly coupled to the steel column in a stationary posture and the other end side is fixed to the vertical cable. Because the end of the split roof frame adjacent to this is fixed to an exquisitely constructed steel column, it is possible to guarantee the maintenance of the posture and prevention of shaking of the steel roof frame suspended by the vertical cable. is there.

  By applying the method of constructing the suspension type steel roof frame of the present invention described above, a steel roof frame of a desired scale (area) can be constructed efficiently without using a temporary support column or the like. It becomes possible.

  As another embodiment of the construction method, in the first step, three or more pairs of steel columns are provided side by side in the beam direction in the first step, and in the third step, each of the adjacent sets The split roof frame may be fixed to a vertical cable suspended from the upper string cable, and a flat steel roof frame defined by at least three sets of six steel columns may be constructed.

  Here, “at least three sets of six steel columns” means that four sets of eight steel columns, ten sets of 20 steel columns, and the like are included according to the desired area of the steel roof frame.

  In another embodiment of the method for constructing a suspension type steel roof frame according to the present invention, two sets of steel struts are erected apart from each other in the girder direction, and two steel struts are arranged between the two steel struts. The first step of bridging the upper chord cable assembled with the above vertical cable, one set of steel frames separated from each other in the beam direction with respect to the one set of steel struts erected in the first step The second step was to stand the struts apart in the direction of the girder and bridge the upper string cable with two or more vertical cables assembled between the two steel struts. A split roof frame is prepared by dividing a flat steel roof frame into two or more in the girder direction, and the divided roof frame is fixed to a vertical cable suspended from each pair of upper string cables and fixed with a vertical cable. Build a steel roof frame by connecting the divided roof frames together Tsu which is made of a flop.

  In this embodiment, two sets of steel struts are set apart in the direction of the girder, and then an upper string cable in which two or more vertical cables are assembled between the two steel struts is installed. Next, this series of construction methods is performed at positions separated in the beam-to-beam direction, thereby constructing a structure in which an upper string cable is bridged between each set of two sets of four steel columns. The construction procedure up to the step is different from the construction method described above.

  Similarly, with this construction method, it is possible to construct a steel roof frame of a desired scale without using a temporary support column or the like.

  In a preferred embodiment of the method for constructing a suspended steel roof frame according to the present invention, in the third step, the divided roofs at both ends on the steel column side fixed to the two steel columns and the vertical cable are provided. After the frame is fixed first, separate divided roof frames adjacent to both of the fixed divided roof frames are fixed to the vertical cable and the already fixed divided roof frame in order, and this is carried from both ends on the steel column side. It repeats to the vicinity of the center of the direction, and finally the split roof frame is fixed to the already fixed split roof frame and the vertical cable on both sides at the center position in the cross direction.

  For example, in a form in which an arched steel roof frame is suspended from an upper string cable in a girder direction, in order to demonstrate the construction procedure of the most preferable divided roof frame in terms of construction accuracy, the inventors have conducted field experiments and a computer. The two-dimensional frame analysis used is performed.

  As an assumed case, one is a construction procedure for suspending a split roof frame in order from the center position of the arch to the left and right steel columns (case 1), and the other is either one of the left and right It is a construction procedure to suspend the split roof frame in one direction in order from the position adjacent to the steel column to the other steel column side (Case 2), and the other one is alternately from the position adjacent to the left and right steel columns This is a construction procedure for suspending the divided roof frame in order toward the arch-shaped central position (case 3).

  Then, based on the results of field experiments and two-dimensional frame analysis, the construction procedure (case 3) for suspending the divided roof frame in turn from the position adjacent to the left and right steel columns to the arch-shaped central position is adopted. However, construction errors that may occur when the last divided roof frame is assembled with the adjacent divided roof frame, etc. (such as misalignment of the position of the assembled bolt holes between the two divided roof frames) are the least likely to occur, and the generated construction error It has been demonstrated that it is easy to absorb.

  In the case of case 1 above, since the split roof frame at the center position, which is the reference, is only suspended by the vertical cable, its posture and positioning are relatively unstable. It may have an error.

  On the other hand, in the case 2 described above, since only one steel column supports the divided roof frames that are sequentially connected to each other in a so-called cantilever type, an eccentric load is likely to act on the steel column, and the erection is supposed to be precise. Even if it is performed, the precise posture cannot be maintained, and it is inclined to the other steel column side, and as a result, there is a possibility that it becomes a construction error. In addition, a plurality of substantially arch-shaped divided roof frames supported in a cantilever posture on one steel column are likely to be displaced by their own weight, which may lead to construction errors. And when trying to fix the last split roof frame to both the split roof frame at the end position of the substantially arch shape and the other steel column, the overall error that these multiple errors accumulate becomes too large. There is a high possibility that the connection of the last split roof frame will be extremely difficult.

  When Case 3 is applied to the above two cases, the adjacent roof frames are fixed by the left and right steel columns, and both the steel columns have a divided roof frame that is connected at most to the vicinity of the center of the arch shape. Since it only has to be supported, it is easy to guarantee the posture of the steel column, and the construction error is greatly reduced. As a result, the error that can occur during the mounting alignment when fixing the split roof frame at the center position of the last arch shape can be greatly reduced, and the split roof frame at the center position and the split roof frame at the left and right positions can be reduced. It can be easily connected.

  In a preferred embodiment of the method for constructing a suspension type steel roof frame according to the present invention, in the first step, after the steel column is erected, the steel column is installed from the side where the steel roof frame is not constructed. It is stably supported by a beam, or in addition to this, it is further stably supported by an oblique cable extending from the side where the steel roof frame is not constructed to the stigma of the steel column.

  In the case where the split roof frame is suspended in order from the position adjacent to the left and right steel columns to the arch-shaped central position, it is important to maintain the right and left steel columns and maintain their postures.

  Therefore, in the present embodiment, the steel column that is erected is stably supported by the steel beam from the side where the steel roof frame is not constructed, or in addition to this, the steel column is constructed from the side where the steel roof frame is not constructed. Stable support with an oblique cable extending to the stigma makes it possible to maintain a precise and stable posture of the steel post after standing, and to divide the roof frame in turn alternately in the left-right direction toward the arch-shaped central position described above. High construction accuracy during construction can be guaranteed.

  Further, the present invention extends to a method for constructing a suspended steel roof frame. This method constructs a suspended steel roof frame by the method for constructing the suspended steel roof frame, and A suspension type steel roof is constructed by fixing a roof material having a flat area defined by four steel frames to a flat steel roof frame defined by the two groups of four steel columns. It is.

  By constructing a continuous roof material having a flat area defined by two sets of four steel struts at a time, a steel roof can be constructed efficiently. This is a construction method that solves the problem that, for example, when the steel roofs attached to each divided roof frame are connected to each other, the number of connecting parts between the roofing materials increases and the construction efficiency becomes extremely low. .

  By applying the construction method of the present invention, the steel roof frame is constructed by sequentially connecting a plurality of divided roof frames, while the steel roof frame corresponding to the area defined by two sets of four steel columns is used. By fixing the roofing material having the entire area of the area, for example, in the structure type in which three sets of steel columns are installed in the beam-to-beam direction, the connecting points of the roofing materials are shifted. Only two rows of directions (only two places) can be provided, and the construction efficiency is remarkably high. In addition, as a method for connecting roof materials, a method of caulking ends of both roof materials or a method of welding can be applied. Moreover, the roof material to be applied is not particularly limited, and corrugated iron plates, folded plate iron plates, and film materials such as sheets and mats can be fried.

  Furthermore, in another embodiment of the method for constructing a suspension type steel roof according to the present invention, the suspension type steel roof frame is constructed by the method for constructing the suspension type steel roof frame, and the constructed steel roof is constructed. A roof material having a whole frame area is fixed to the steel roof frame to construct a suspended steel roof.

  The construction method of the present embodiment is to fix one roof material covering the entire area to the steel roof frame regardless of the number of steel columns. For example, it is suitable when constructing a steel roof having a relatively small overall area, such as a structure type composed of three sets of six or four sets of eight steel columns. In addition, when laying a continuous piece of roofing material, it is assumed that the upper string cable etc. in the middle position interferes with the roofing material, but in this case, the location where the roof material interferes with the upper string cable etc. is cut out, What is necessary is just to lay a roofing material on a steel-frame roof frame, inserting an upper string cable etc. through this notch location.

  As can be understood from the above explanation, according to the suspension type steel roof frame and the method of constructing the steel roof of the present invention, it is not necessary to use a temporary support column or the like, and therefore, compared to the case of using a temporary support column or the like. Thus, a steel roof frame and a steel roof of a desired scale (area) can be constructed while greatly shortening the construction period.

It is the perspective view which showed one Embodiment of the suspension-type steel roof frame constructed | assembled with the construction method of this invention. It is an arrow view seen from the II direction of FIG. 1, and is a top view of a steel-frame roof frame. It is a flowchart which shows one Embodiment of the method of constructing the suspension type steel roof frame of this invention, and the method of constructing a steel roof. It is a figure explaining the 1st step in the flowchart of FIG. It is a figure explaining the 2nd step in the flowchart of FIG. It is a figure explaining the 3rd step in the flowchart of FIG. FIG. 7 is a diagram for explaining a third step following FIG. 6. It is a figure explaining the method (step) of constructing the steel roof in the flowchart of FIG. 3, Comprising: It is a perspective view which shows one Embodiment of the constructed steel roof of the suspension type. It is a flowchart which shows other embodiment of the method of constructing the suspension-type steel roof frame of this invention, and the method of constructing a steel roof. It is a figure explaining the 1st step in the flowchart of FIG. It is a figure explaining the 2nd step in the flowchart of FIG. It is the perspective view which showed other embodiment of the steel-frame roof frame constructed | assembled by the construction method of this invention. It is the perspective view which showed other embodiment of the suspension type steel roof. It is the perspective view which showed other embodiment of the suspension type steel roof. It is the figure which showed the two-dimensional frame analysis result for every construction procedure of a split roof frame.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a suspension-type steel roof frame and a method of constructing a steel roof according to the present invention will be described below with reference to the drawings. In addition, illustration of heavy machinery, such as a crane and an aerial worker used at the time of suspension of a steel-frame support | pillar or when raising an upper string cable or a split roof frame, is abbreviate | omitted.

(Embodiment 1)
FIG. 1 is a perspective view showing a suspended steel roof frame constructed in Embodiment 1 of the method for constructing a suspended steel roof frame according to the present invention, and FIG. 2 is a plan view thereof.

  The suspension-type steel roof frame 10 shown in the figure has a set of two steel columns 1A, 1A that are separated in the direction of girder, and a separate pair of steel columns 1A, 1A that are separated in the beam-to-beam direction. A set of two steel struts 1B, 1B, an upper chord cable 2, 2 spanned between the two steel struts in each set, a plurality of vertical cables 3,. The steel roof frame 4 is fixed to and suspended from the vertical cables 3.

  The steel struts 1A and 1B are both erected from a foundation footing 1a at a pile head of a pile 1b such as a steel pipe pile or a PHC pile provided in the ground, and a steel beam 1c for a tie that extends outward from a midway position thereof. The standing posture constructed in the vertical direction is maintained by the cable 1d for the extension extending outward from the capital. Here, these steel struts 1A and 1B are made of steel pipes having a circular, square or rectangular cross section, square steels such as H-shaped steel, I-shaped steel, C-shaped steel, and concrete filled steel tubes (CFT). Applicable. In addition, when supporting a steel support | pillar, when a pile is unnecessary, the construction can be omitted.

  The steel roof frame 4 includes arch-shaped girder steel beams 4a and 4a fixed to the vertical cables 3 hanging from the two upper chord cables 2 and 2, and an inter-beam steel beam 4b connecting the girder steel beams 4a and 4a. ,... And a diagonal steel rod 4c disposed in a cross shape within a frame surface defined by these steel beams.

  Further, the steel roof frame 4 is composed of divided roof frames 4A to 4E that cover the areas of the divided areas A to E. Each of the divided roof frames 4A to 4E is divided by an arch-shaped girder steel beam 4a. , And two or more inter-beam steel beams 4b,..., And a diagonal steel rod 4c arranged in a cross shape.

  In each divided roof frame, the crossed steel beam 4a ′ as a constituent member is fixed to the vertical cable 3, and the adjacent divided roof frames are not stretched over a contact portion where both the steel beam 4a ′ abut. It is connected by being fixed by bolts, welded, or clamped through the illustrated attachment plate.

  And especially the divided roof frames 4A and 4E at the left and right ends are both rigidly connected to the steel columns 1A and 1B with bolts or the like.

  Next, with reference to FIG. 3 and FIGS. 4-7, the construction method of the suspension type steel roof frame 10 shown in FIGS.

  FIG. 3 is a flowchart showing an embodiment of a method for constructing a suspended steel roof frame and a steel roof according to the present invention. 4 is a diagram for explaining the first step in the flowchart of FIG. 3, FIG. 5 is a diagram for explaining the second step, and FIGS. 6 and 7 explain the third step in order. FIG.

  First, two piles 1b and 1b are constructed with a predetermined span in the ground direction in the ground, and two piles are similarly separated from the two piles 1b and 1b by a predetermined span in the inter-beam direction. After constructing 1b and 1b and constructing the foundation footing 1a on each pile head, the steel pillars 1A and 1B are erected on each foundation footing 1a (first step S1).

  In this step, in order to ensure the stable posture maintenance of each constructed steel column, a steel beam 1c for a stand-up extending outward from the middle position of the steel column 1A, 1B is provided, and the steel columns 1A, 1B are further provided. A cable 1d for holding extending outward from the stigma is stretched (see FIG. 4).

  After constructing two sets of two steel struts in step S1, the upper string cable 2 in which two or more vertical cables 3,. 2 step S2, see FIG. Here, the assembling of the upper string cable 2 and the two or more vertical cables 3,... May be assembled in advance in a factory or on-site yard, or may be assembled on site after standing between steel columns.

  When the upper string cable 2 is bridged between the steel columns, the steel roof frame is fixed to the vertical cables 3.

  When fixing the steel roof frame, a flat steel roof frame 4 defined by two sets of four steel columns 1A and 1B is divided in advance into two or more in the direction of girder in a factory or on-site yard. The divided roof frames 4A to 4E are manufactured.

  And the fixed order of each division | segmentation roof frame 4A-4E fixes the division | segmentation roof frame 4A, 4E located in the right-and-left end in advance, or both are fixed simultaneously.

  In fixing the divided roof frames 4A and 4E, one end thereof is fixed to the steel frames 1A and 1B, and a part of the girder steel beam 4a 'is fixed to the vertical cable 3 (see FIG. 6).

  After the split roof frames 4A and 4E at the left and right ends are fixed, a part of each girder steel beam 4a 'of the split roof frames 4B and 4D on the central side of the arch adjacent to these is fixed to the vertical cable 3 and divided. The connecting points with the roof frames 4A and 4E are connected (see FIG. 7, step S3a above).

  Finally, the divided roof frame 4C is lifted to the remaining arch center section (divided region C), fixed to the vertical cable 3, and connected to the left and right divided roof frames 4B, 4D as shown in FIGS. The steel roof frame 10 is constructed (step S3b (third step in combination with step S3a)).

  Here, as described in the above flow, by adopting a construction procedure for suspending the divided roof frame in order from the position adjacent to the left and right steel columns 1A, 1B alternately toward the center position of the arch shape, The construction error that can occur when assembling the divided roof frame 4C with the adjacent divided roof frames 4B and 4D (such as misalignment of the positions of the assembled bolt holes between the two divided roof frames) is the least likely, and the generated construction error is Easy to absorb.

  This has been proved by field tests by the present inventors and the following two-dimensional frame analysis. Here, in this field test, as another construction procedure, a construction procedure (case 1) for suspending the divided roof frame in order from the center position of the arch to the left and right steel pillars, or one of the left and right steel pillars The construction error in the case of the construction procedure (case 2) in which the divided roof frame is suspended in one direction in order from the position adjacent to the other steel column side is being verified. Thus, it is specified that the error becomes relatively large. In the case of the construction procedure of Case 1, since the positioning of the split roof frame at the center position as a reference is only suspended by the vertical cable and its positioning is relatively unstable, it is likely that there will be a lot of construction errors from the beginning of the suspension of the split roof frame. It is considered that the error accumulates until the last divided roof frame is fixed, resulting in a large error. On the other hand, in the case of the construction procedure of case 2, since only one steel strut supports the divided roof frames that are sequentially connected in a so-called cantilever manner, an eccentric load is easily applied to the steel strut, and the standing construction is Even if it is done precisely, when it tilts to the other steel pillar side without being able to maintain its precise posture, this results in a construction error. Furthermore, a plurality of substantially arch-shaped divided roof frames supported in a cantilever posture on one steel column are likely to be displaced by their own weight, which causes a construction error. And, when trying to fix the last divided roof frame to both the divided roof frame at the end position of the substantially arched shape and the other steel column, the total error that these multiple errors accumulate becomes large. it is conceivable that.

  In contrast to these construction procedures, in the case of the construction procedures shown in FIGS. 3, 6 and 7, adjacent split roof frames are fixed by left and right steel columns, and both steel columns are at most near the center of the arch shape. Since it is only necessary to support the split roof frame that leads to the steel frame, it is easy to guarantee the posture of the steel column, and the construction error is greatly reduced. As a result, the error that can occur when aligning the mounting position of the split roof frame at the center position of the arch shape can be greatly reduced, and the split roof frame at the center position and the split roof frame at the left and right positions can be easily connected. Can be done.

  Furthermore, in the construction method described with reference to FIGS. 3 to 7, the girder steel beam 4a ′, the inter-beam steel beam 4b, and the diagonal steel bar 4c constituting the split roof frame are fixed to each other with bolts or the like. In addition, when the adjacent divided roof frames are also connected by bolts or the like, they need not be temporarily fixed (temporarily tightened), and can be fixed by one permanent fixing (final tightening).

  Temporary fixing is intended to absorb the error with a loose member, assuming itself that the bolt hole cannot be aligned at the connection point between members due to various errors during member manufacture and construction. In other words, it will be forced twice the trouble of temporary fixing and permanent fixing. On the other hand, the construction method of the present invention employs the suspension type, so that various errors can be easily absorbed by the entire suspension structure, and temporary fixing is not necessary for the connection between members. Become. For example, when a split roof frame fixed to a vertical cable is connected to an adjacent split roof frame, even if there are various errors, it is difficult to connect the split roof frames at the connection position as designed. By slightly correcting the posture of the suspended divided roof frame, it is possible to easily connect the both, and it is not necessary to absorb errors by temporarily fixing the members.

  When the suspended steel roof frame 10 shown in FIGS. 1 and 2 is constructed, the roof material 5 having the entire area of the steel roof frame 10 is lifted and fixed to the steel roof frame 10 as shown in FIG. Thus, a suspended steel roof 20 is constructed (step S4 in the flowchart of FIG. 3).

  Here, as a material of the roofing material 5, a corrugated iron plate, a folded plate iron plate, a film material such as a sheet or a mat, or the like can be applied.

  In the suspension-type steel roof 20 shown in the figure, the roof material 5 is supported by the suspension-type steel roof frame 10, so that the weight of the roof material 5 is not limited. In addition, a desired size can be set as the scale (area). Further, in this construction method, no temporary support is required, and there is no problem that the construction period is prolonged due to assembly or disassembly when the temporary support is used.

(Embodiment 2)
FIG. 9 is a flowchart showing another embodiment of a method for constructing a suspended steel roof frame and a method for constructing a steel roof according to the present invention, and FIG. 10 is a diagram illustrating the first step. FIG. 11 is a diagram for explaining the second step.

  In this construction method, as shown in FIG. 10, as a first step, two sets of steel struts 1A, 1A are erected, followed by two or more between the two steel struts 1A, 1A. The upper cable 3 assembled with the vertical cables 3,... Is bridged (first step S1).

  Next, as shown in FIG. 11, with respect to the set of standing steel columns 1A, 1A, the pair of steel columns 1B, 1B are separated in the carry direction by separating them in the direction between the beams. An upright cable 2 in which two or more vertical cables 3,... Are assembled between the two steel struts 1B, 1B is erected (second step S2).

  In this construction method, the first chord cable 2 is continuously spanned between a pair of steel struts, and this is repeated at positions separated in the beam-to-beam direction, and the subsequent third step is the embodiment. This is done in the same way as 1.

(Embodiment 3)
By repeating the construction steps of the first embodiment or the second embodiment, as shown in FIG. 12, additional steel struts 1C and 1C are further erected in the beam-to-beam direction, the upper chord cable 2 is bridged, and the steel strut 1B , 1B and a separate steel roof frame 4 are suspended together with the upper string cable 2 spanned between 1B, thereby suspending the steel roof frame 10A having a flat area twice as large as the steel roof frame 10 shown in FIGS. Can be built.

  Here, two vertical cables 3 and 3 corresponding to the left and right steel roof frames 4 and 4 are suspended from the same portion of the upper string cable 2 spanned between the steel columns 1B and 1B located in the center. It is good to leave.

  For a suspended steel roof frame 10A having two steel frame frames 4 and 4 shown in FIG. 12, as shown in FIG. The suspension type steel roof 20A can be constructed by fixing the material 5 and caulking the connecting portions of the both roof materials 5 and 5.

  Moreover, as shown in FIG. 14, with respect to the suspended steel roof frame 10A, the roof material 5 made of a continuous corrugated iron plate having the entire area of each steel roof frame 4, 4 is fixed. A steel roof 20B can be constructed. In addition, when laying the roofing material 5 on the entire surface of the steel roof frames 4, 4, the upper string cable 2 laid between the steel columns 1 </ b> B, 1 </ b> B becomes an obstacle. Therefore, a notch or the like is provided in advance in the roof material 5 at a position where it interferes with the upper string cable 2 and the roof material 5 is laid on the steel roof frames 4 and 4 while the upper string cable 2 is inserted into the notch. After installation, the notch should be closed by stitching or caulking.

  Although not shown in the drawings, a steel roof structure having a larger scale is constructed by arranging four or more pairs of steel columns in the beam-to-beam direction, and constructing a larger scale steel roof frame. It is also possible to construct a steel roof with a larger suspension type by fixing it to the frame.

[2D frame analysis and result for each construction procedure of split roof frame]
In determining the construction procedure of the divided roof frame in the construction method of the present invention, the present inventors have determined the error between the position of the divided roof frame fixed for each construction procedure and the design position. It was proved by computer analysis that it was resolved.

  In this analysis, a two-dimensional frame model is created for the steel roof frame in the direction of carry in the computer, and material property values and rigidity are assigned to each frame. From the divided roof frame models A and E at the left and right ends, The split roof frame models B, D, and C are alternately fixed toward the center, and the suspension structure is displaced by the eccentricity generated when each of the split roof frames is fixed. The amount of deviation between the position and the design position was verified by two-dimensional frame analysis.

  FIG. 15 shows, in order from the top, (1) a step of fixing the leftmost divided roof frame model A, (2) a step of fixing the rightmost divided roof frame model E, and (3) a division adjacent to the model A. A step of fixing the roof frame model B, (4) a step of fixing the divided roof frame D adjacent to the model E, and (5) a step of fixing the divided roof frame C at the central position adjacent to the models B and D. The two-dimensional error result of the position of the divided roof frame fixed during each of the steps is shown.

  From the figure, the largest error in the step (1) is reduced as it goes through the construction procedure, and the error is converged to zero in the step (5) where the steel roof frame is finally constructed.

  By going through the construction procedure of this split roof frame, the left and right split roof frames are fixed to the steel pillars that have been maintained in a precise and stable manner, and separate split roof frames are sequentially connected to them. This makes it possible to eliminate the instability of the position of the split roof frame, which can be a disadvantage when adopting the suspension type, and to realize the connection of split roof frames with less construction error and excellent error absorption. .

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  1A, 1B, 1C ... Steel frame support, 1a ... Foundation footing, 1b ... Pile, 1c ... Steel steel beam, 1d ... Steel cable, 2 ... Cord cable, 3 ... Vertical cable, 4 ... Steel roof frame, 4A, 4B , 4C, 4D, 4E ... split roof frame, 4a, 4a '... girder steel beam, 4b ... inter-beam steel beam, 4c ... diagonal steel rod, 5, 5A ... roofing material, 10, 10A ... suspension type steel roof Frame, 20, 20A, 20B ... suspended steel roof, A, B, C, D, E ... divided areas

Claims (9)

A first step in which two sets of steel struts are erected apart in the girder direction, and two sets are installed side by side in the interbeam direction;
A second step of bridging the upper string cable with two or more vertical cables assembled between two steel struts in each group;
A split roof frame was prepared by dividing a flat steel roof frame composed of 2 sets of 4 steel struts into two or more in the direction of girder, and the divided roof frames were suspended from each set of upper string cables. A method of constructing a suspended steel roof frame comprising the third step of constructing a steel roof frame by connecting the divided roof frames fixed to the vertical cable and connecting the divided roof frames. In the first step, three or more sets of steel struts are installed side by side in the direction between the beams.
In the third step, the split roof frame is fixed to the vertical cable suspended from each upper chord cable in the adjacent group, and a steel roof frame having a flat area defined by at least three groups of six steel columns is constructed. A method of constructing a suspended steel roof frame according to claim 1. A first step in which a pair of steel struts are set apart from each other in the girder direction, and an upper string cable in which two or more vertical cables are assembled between the two steel struts is bridged;
Separate one pair of steel struts from each other in the direction of the beam and separate the two sets of steel struts from the pair of steel struts erected in the first step. A second step of bridging the upper string cable in which two or more vertical cables are assembled
A split roof frame was prepared by dividing a flat steel roof frame composed of 2 sets of 4 steel struts into two or more in the direction of girder, and the divided roof frames were suspended from each set of upper string cables. A method for constructing a suspended steel roof frame, comprising the steps of constructing a steel roof frame by connecting the split roof frames fixed to a vertical cable and connecting the divided roof frames. The second step is repeated, and at least three sets of upper chord cables in which two sets of steel cables and two or more vertical cables spanned between the steel columns are assembled in the direction between the beams are provided.
In the third step, the split roof frame is fixed to the vertical cable suspended from each upper chord cable in the adjacent group, and a steel roof frame having a flat area defined by at least three groups of six steel columns is constructed. A method for constructing a suspended steel roof frame according to claim 3.   In the third step, the divided roof frames at both ends on the steel column side fixed to the two steel columns and the vertical cable are first fixed, and then a separate division adjacent to both of the fixed divided roof frames. The roof frame is fixed in order to the vertical cable and the already fixed divided roof frame, and this is repeated from both ends of the steel column to the middle of the girder direction, and finally the divided roof frame is already installed at both sides of the girder direction. The method for constructing a suspended-type steel roof frame according to any one of claims 1 to 4, wherein the suspended roof frame is fixed to a fixed split roof frame and a vertical cable.   In the first step, after the steel column is erected, the steel column is stably supported by the steel beam from the side where the steel roof frame is not constructed, or in addition to this, the steel frame is constructed from the side where the steel roof frame is not constructed. The method for constructing a suspension type steel roof frame according to any one of claims 1 to 5, wherein the suspension frame is stably supported by an oblique cable extending to a column head of the column.   The fixing of the members constituting the split roof frame and the fixing of the adjacent divided roof frames are both performed by one permanent fixing without temporary fixing. How to build a steel roof frame with a suspension type. A suspension type steel roof frame is constructed by the method of constructing the suspension type steel roof frame according to any one of claims 1 to 7,
The roof material having a flat area defined by the two sets of four steel columns is fixed to the flat steel roof frame defined by the two sets of four steel columns to construct a suspension type steel roof. How to build a suspended steel roof. A suspension type steel roof frame is constructed by the method of constructing the suspension type steel roof frame according to any one of claims 1 to 7,
A method for constructing a suspended steel roof, wherein a roof material having a total flat area of the constructed steel roof frame is fixed to the steel roof frame to construct a suspended steel roof.

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