Steel frame erection method

Abstract

To provide a steel frame erection method which can be applied to a large-scale building, which enables execution of work from steel frame erection to ceiling finishing work without scaffolding, which can enhance safety and workability, which can shorten a construction period, and which can reduce costs.SOLUTION: The method includes a column erecting step of erecting steel columns, a short-span girder joining step of joining short-span girders to adjacent steel columns, a large-span girder ground assembling step of ground assembling large-span girders, a large-span girder installing step of installing the ground assembled large-span girders on the steel columns facing each other using two self-propelled cranes, and a small beam and brace joining step of joining small beams and braces to adjacent large-span girders.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for erecting a steel frame, and more particularly to a method for erecting a steel frame for a building having a relatively large internal space. [Background technology]

[0002] Generally, when erecting the steel frame of a building, after the columns are erected, simple temporary scaffolding called hanging scaffolding or a topic is set up on the beams, and workers climb up onto it to perform bolting, painting, etc.

[0003] However, when erecting steel frames for buildings with relatively large interior spaces, such as gymnasiums, the work location is at a high altitude, which poses problems such as time-consuming efforts to ensure safety, time-consuming movement of scaffolding and topography, and high construction costs.

[0004] To address these problems, steel frame construction methods that ensure safety have been proposed. Specifically, for example, there is a roof construction method in which, with the aim of improving safety and shortening construction time, peripheral columns are erected, and the roof members are assembled on the ground surrounded by the columns to form the roof, and cranes are positioned around the roof and each crane is operated simultaneously to lift up the assembled roof and install it in a columnar shape (see Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 55-148847 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the roof construction method proposed above is intended for roofs with low out-of-plane rigidity, such as suspended roofs, and since the entire assembled roof is lifted up using cranes on all four sides, there are problems such as difficulty in applying it to large buildings such as gymnasiums, there are significant restrictions on the surrounding environment, and the construction is large-scale.

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide a method of steel frame erection that can be applied to large-scale buildings, allows the entire process from steel frame erection to ceiling finishing work to be carried out without scaffolding, and enables improved safety and workability, shorter construction time, and reduced costs. [Means for solving the problem]

[0008] The steel frame erection method of the present invention has been made to solve the above technical problems and is characterized as follows.

[0009] First, the steel frame erection method of the present invention includes a column erection process for erecting steel columns; a short span girder joining step of joining short span girders to adjacent steel columns; a large span girder ground assembly process for assembling large span girder; a large span girder erection process in which the pre-assembled large span girders are erected on the opposing steel columns using two self-propelled hoists; The method is characterized by having a sub-beam and brace joining process for joining sub-beams and braces to adjacent long-span girders. Secondly, in the steel frame erection method of the first invention, the joining of the steel column and the short span girder in the short span girder joining step; Joining the steel column and the large span girder in the large span girder erection process; It is preferable that the joining of the large span girder to the sub-girders and braces in the sub-girder and brace joining step be performed using a self-propelled aerial work platform. Thirdly, in the steel frame erection method of the second invention, it is preferable to have a painting step of painting a finish on the steel frame after the sub-beam and brace joining step. Fourth, in the steel frame erection methods of the first to third inventions, it is preferable that the joints of the girders are joined to the steel columns in advance. Fifth, in the steel frame erection method according to the first to fourth inventions, it is preferable to have a ceiling finishing step of finishing the underside of the ceiling deck after the sub-beam and brace joining step. Sixth, in the steel frame erection method of the fifth invention, it is preferable that the deck used in the ceiling finishing step has a glass fiber sheet attached to the underside of the deck. [Effects of the Invention]

[0010] According to the steel frame erection method of the present invention, the entire process from erecting the steel frame to finishing the ceiling can be carried out without scaffolding, thereby improving safety and workability, shortening construction time, and reducing costs. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic top view showing one embodiment of a steel frame erection method according to the present invention. FIG. [Figure 2] 1A and 1B are explanatory diagrams of the steps of an embodiment of a steel frame erection method, in which (a) is a top view showing the column installation step, and (b) is a top view showing the short-span girder joining step. [Figure 3] 1A and 1B are explanatory diagrams of the steps of the steel frame erection method according to the present invention, where (c) is a top view showing the large-span girder ground assembly step, and (d) is a top view showing the large-span girder erection step. [Figure 4] 1(e) is a top view showing the process of joining the sub-beams and braces; FIG. [Figure 5] FIG. 10 is a schematic diagram showing the lifting state of the large-span girder during the large-span girder erection process. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of a steel frame erection method according to the present invention will be described in detail below with reference to the drawings. Figure 1 is a schematic top view showing an embodiment of a steel frame erection method according to the present invention, and Figures 2(a), (b), 3(c), (d), and 4(e) are explanatory diagrams of each step of the steel frame erection method.

[0013] The steel frame construction method of this embodiment, when constructing a building with a huge space, includes a column installation process, a short-span girder connection process, a long-span girder base assembly process, a large-span girder erection process, and a sub-girder and brace connection process.

[0014] (pillar installation process) In the column erection process, as shown in Figure 2(a), steel columns 1 are erected in predetermined positions on the outer edge of the construction area 6 according to the design. The steel columns 1 may be heavy steel columns with sufficient strength that are typically used in the steel frame erection of large-scale buildings, and examples of shapes include H-shaped steel, angle steel, channel steel, lip channel steel (C-shaped steel), I-shaped steel, square steel pipe, and circular steel pipe. In addition, girder connections 13 and diagonal brace connections 14 for connecting the girders and diagonal braces 32 can be welded in advance at the factory to the steel columns 1 to be erected.

[0015] The erection of the steel column 1 can be carried out using one or two crawler cranes as self-propelled lifting machines 4 to move and set up the steel column 1. The steel column 1 is set up by inserting anchor bolts, which have been installed in advance during foundation construction, into anchor bolt insertion holes provided at the bottom end of the steel column 1, and then fixing it with bolts to make it self-standing. The crawler crane 4 to be used can be appropriately selected depending on the specifications, type, length, etc. of the steel column 1, and specifically, a crawler crane 4 with a lifting capacity of 25 to 300 tons can be suitably used. Using the crawler crane 4 makes it possible to move around the construction site and lift girders smoothly.

[0016] Furthermore, the minimum number of steel columns 1 to be erected is two adjacent steel columns 11 (steel columns 1 to which short-span girders 2 are connected) or two facing steel columns 12 (steel columns 1 to which long-span girders 3 are connected), which are erected as a set of steel columns 1, and the short-span girder joining process and girder erection process, which will be described later, are carried out for each group of steel columns 1. In the embodiment of each process shown in Figures 2 to 4, taking into consideration the actual daily workload, etc., two adjacent steel columns 11 and two facing steel columns 12, totaling four columns, are erected as one set. Furthermore, steel columns 1 that have undergone the short-span girder joining process and girder erection process, which will be described later, can be erected sequentially next to or across from the steel columns 1 for which the short-span girder joining process and girder erection process, which will be described later, have been completed.

[0017] In the present invention, adjacent steel columns 11 refer to steel columns 1 that are spaced relatively short apart and are joined by short-span girders 2, while opposing steel columns 12 refer to steel columns 1 that are spaced longer apart than adjacent steel columns 11 and are joined by long-span girders 3.

[0018] (Short span girder joining process) In the short-span girder joining process, adjacent steel columns 11 are joined together with short-span girders 2, as shown in FIG. 2(b). The short-span girders 2 are joined by lifting them with an applicable crawler crane 4, taking into consideration the weight and length of the short-span girders 2. The steel column 1 and the short-span girders 2 are joined using a lift-type self-propelled aerial work platform 5, with workers on board using bolts and nuts. From the perspective of workability, it is preferable that the crawler crane 4 that lifts the short-span girders 2 be located outside the steel column 1, i.e., outside the construction area 6, and that the self-propelled aerial work platform 5 that performs the joining be located inside the steel column 1, i.e., within the construction area 6.

[0019] After the previous column erection process is completed, it is preferable to carry out the short-span girder joining process as soon as possible, and especially at the end of the day's work, to complete the construction until the steel column 1 and short-span girder 3 are joined to form a stable rectangular shape when viewed from above. Also, if at the end of the day's work, even a portion of the construction has not been completed to the above-mentioned stable state and only the steel column 1 is standing, it is preferable to temporarily join adjacent steel columns 11 together with wire or the like to take measures to prevent the steel column 1 from falling over.

[0020] (Large span girder assembly process) In the long-span girder ground assembly process, as shown in Figure 3(c), the long-span girders 3 are constructed by ground assembly on site, and the diagonal braces 32 are connected according to the design. Since the long-span girders 3 of large buildings with wide interior spaces, such as gymnasiums, are usually long and heavy, in this invention the large-span girders 3 are constructed by ground assembly on site using steel blocks that are divided before shipping from the factory.

[0021] Ground assembly is performed in the large arena section within the building's construction area 6. Specifically, multiple ground assembly platforms 31 are first arranged in the arena section 6 in the direction of the installation of the long-span girders 3. Block-shaped steel members are then placed on the platforms, and the long-span girders 3 are constructed by joining the individual steel members. The constructed long-span girders 3 are then installed parallel to the installation direction and placed on the ground assembly platforms 31. Also, at this stage, depending on the design, the diagonal braces 32 are also ground assembled. Furthermore, during this large-span girder ground assembly process, it is preferable to deploy a lift-type self-propelled aerial work platform 5 near the location where the large-span girders 3 are to be constructed within the construction area 6, taking into account the ease of operation of the large-span girder erection process described below. This allows for smooth installation of the large-span girder and reduces environmental constraints. The large-span girder ground assembly process may be performed prior to or simultaneously with the column installation process and short-span girder joining process. Alternatively, a plurality of long-span girders 3 may be pre-assembled.

[0022] (Large span girder construction process) In the long-span girder erection process, as shown in Figure 3(d), the large-span girder 3 constructed in the above-mentioned large-span girder ground assembly process is lifted using two crawler cranes 4 and erected on opposing steel columns 12. To lift the large-span girder 3, as shown in Figure 5, two crawler cranes 4 are moved to both ends of the large-span girder 3, and the wires 41 of each crawler crane 4 are attached near both ends of the large-span girder 3 and simultaneously wound up. The large-span girder 3 is lifted so that it is as parallel to the ground as possible and connected to the girder joint 13 at the top end of the steel column 1. Then, in this state, a worker aboard a lift-type self-propelled aerial work platform 5 joins the girder joint 13 of the steel column 1 to the large-span girder 3 with bolts and nuts. At this time, the diagonal braces 32 are also joined to the diagonal brace joint 14 according to the design.

[0023] The crawler crane 4 used to erect the large-span girder 3 can be selected appropriately depending on the weight, length, etc. of the large-span girder 3.Specific examples include the use of two crawler cranes 4, one 300 ton and one 25 ton, or two 80 ton crawler cranes 4.

[0024] 2 and 3, it is preferable to complete the process from the pillar erection process to the large-span girder erection process in one day, and it is preferable to position the crawler crane 4 so that it does not move significantly. This reduces the loss of time it takes to move the crawler crane 4. Specifically, to ensure stable lifting of heavy loads and to reduce the working radius, it is preferable to position the crawler crane 4 as close to the outside of the construction area 6 as possible, near the midpoint between two adjacent steel columns 11. Furthermore, by moving the crawler crane 4 in the direction of the arrow shown in FIG. 1 after the large-span girder erection process, the process can be completed efficiently.

[0025] (Sub-beam and brace joining process) Once the erection of at least two long-span girders 3 has been completed through the long-span girder erection process, sub-girders 7 and braces 71 are joined to the two long-span girders 3, as shown in Figure 4(e). Additionally, side sub-girders and braces are joined to adjacent steel columns. The sub-girders 7 and braces 71 are also lifted by a crawler crane 4 and joined with bolts and nuts using a self-propelled aerial work platform 5. At this time, horizontal nets and other fittings can also be installed according to the design.

[0026] In the steel frame erection method of the present invention, each step shown in Figures 2 to 4 is basically performed using only a crawler crane 4 and a self-propelled aerial work platform 5, so the transportation and installation of each steel material can be done quickly and efficiently, and because the erection of the long-span girder 3 is done using two crawler cranes, it can be done more efficiently than using a single large crane, shortening the construction period. Furthermore, because there is no need to set up suspended scaffolding or topics during steel frame erection, the construction period, including demolition work, can be significantly shortened.

[0027] (painting process) In the steel frame erection method of this embodiment, a painting process can be performed after the sub-beam and brace joining process to paint the steel frame. Painting of the steel frame can be performed on joints of the steel columns 1, long-span girders 3, sub-beams 7, braces 71, etc., joined during steel frame erection, and touch-up painting can also be performed. These paintings can also be performed by applying a rust-preventive paint followed by an oil paint of a specified color, or by applying only a rust-preventive paint adjusted to the finish color based on a value engineering proposal, etc. If only a rust-preventive paint is used, it is preferable to apply two coats of paint.

[0028] Furthermore, painting can also be performed in the painting process using the self-propelled aerial work platform 5. By using the self-propelled aerial work platform 5, movement to the painting location can be performed smoothly, improving workability and contributing to shortening the construction period.

[0029] Furthermore, in the steel frame erection method of the present invention, as a ceiling finishing process, after the above-mentioned joist and brace joining process, finishing of the underside of the ceiling deck can be carried out as needed. The underside of the deck can be covered with glass fiber sheeting, or gypton, rock wool sound-absorbing material, or calcium silicate board can be attached. System ceilings and membrane ceilings can also be installed.

[0030] The above describes the steel frame erection method of the present invention based on an embodiment, but the present invention is not limited to the above embodiment, and various modifications are possible within the scope that does not deviate from the gist of the present invention.

[0031] For example, in the embodiment of the construction procedure shown in Figures 2 to 4 above, in the column installation process, adjacent steel columns 11 and opposing steel columns 12 are erected in pairs, for a total of four columns, and in the short-span girder joining process, short-span girders 2 are joined to the adjacent steel columns 11, and then in the long-span girder erection process, long-span girders 3 are erected to the opposing steel columns 12. However, it is also possible to erect four or more steel columns 1 in advance in the column installation process and to construct multiple long-span girders 3 in the long-span girder base assembly process, so that the short-span girder joining process and the long-span girder erection process overlap and proceed simultaneously.

[0032] Similarly, after the large-span girder erection process is completed for a set of large-span girders 3, the sub-girders, brace joining process, and painting process can be carried out simultaneously, in order. This makes it possible to further shorten the construction period.

[0033] In addition, in the above embodiment, a crawler crane is used as the self-propelled lifting machine 4, but other self-propelled lifting machines 4, such as a crawler crane, can also be used depending on the size of the building and the weight and length of the large-span girder 3, etc.

[0034] According to the steel frame erection method of the present invention, the joining of each steel material is carried out using only the highly maneuverable self-propelled crane 4 and the self-propelled aerial work platform 5, so construction can be carried out without scaffolding, improving safety and workability. Furthermore, by carrying out each process in a predetermined order, it is possible to shorten the construction period and reduce costs. [Explanation of symbols]

[0035] 1 Steel column 11 Adjacent steel columns 12 Facing steel columns 13 Ohashi Shiguchi 14. Straight joint 2 Short span girders 3. Large span girder 31 Ground assembly stand 32 Cane 4 Self-propelled lifting machine (rough terrain crane) 41 Wire 5 Self-propelled aerial work platform 6 Construction Area (Arena) 7 Small beam 71 Brace

Claims

1. A pillar erection process in which steel pillars are erected; a short span girder joining step of joining short span girders to adjacent steel columns; a large span girder ground assembly process for assembling large span girder; a large span girder erection process in which the pre-assembled large span girder is erected on the opposing steel columns using two self-propelled hoists; A steel frame erection method characterized by including a sub-beam and brace joining process for joining sub-beams and braces to adjacent long-span girders.

2. Joining the steel column and the short span girder in the short span girder joining process; Joining the steel column and the large span girder in the large span girder erection process; 2. A steel frame erection method according to claim 1, characterized in that the joining of the large-span girder, the sub-girder, and the brace in the sub-girder and brace joining process is carried out using a self-propelled aerial work vehicle.

3. 2. A steel frame erection method according to claim 1, further comprising a painting step of painting the steel frame after the sub-beam and brace joining step.

4. 2. A steel frame erection method according to claim 1, wherein the joints of the girders are previously joined to the steel columns.

5. 2. The steel frame erection method according to claim 1, further comprising a ceiling finishing step for finishing the underside of the ceiling deck after the sub-beam and brace joining step.

6. 6. A steel frame erection method according to claim 5, wherein the deck used in the ceiling finishing process is a deck with a glass fiber sheet attached to the underside of the deck.

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