Beam member erection method

Abstract

To provide a construction method of a beam member which enables the beam member to be constructed between construction object members in a state where a beam member is arranged at a desired height position with respect to a construction object member.SOLUTION: A construction method of a beam member for constructing a beam member 2 disposed between a plurality of construction object members 1, between construction object members 1 comprises: a receiving steel frame installing step of installing receiving steel frames 4 to beam ends of the beam member 2 in a state where their one ends project from the beam ends of the beam member 2 toward a construction direction of the beam members 2; a beam member arranging step of arranging the beam member 2 between the construction object members 1 so that one ends of the receiving steel frames 4 are mounted on upper surfaces of the construction object members 1; and a beam member construction step of joining the beam ends of the beam member 2 to a side surface of the construction object members 1 to construct the beam member 2 between the construction object members 1. In the receiving steel frame installing step, the receiving steel frames 4 are installed to the beam ends of the beam member 2 in a state of being arranged in vertically intermediate portions of the beam member 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for erecting a beam member, which is disposed between a plurality of erection target members, between the erection target members. [Background technology]

[0002] The background technology of the present invention includes, for example, a construction method in which a temporary support member is fixed to the upper surface of the beam end side of a sub-beam member (beam member) that forms the lower side of a PCa sub-beam, with one end of the member protruding from the beam end of the sub-beam member, and one end of this temporary support member is placed on the upper surface of the main beam member (member to be erected) that forms the lower side of the PCa main beam, and then post-cast concrete is poured to form the upper part of the main beam and the upper part of the sub-beam, and the temporary support member is embedded in the main beam and the sub-beam, thereby joining the main beam and the sub-beam (see, for example, Patent Document 1).

[0003] There is also a method of joining a PCa main girder and a PCa sub-girder in which temporary steel material is provided at the upper end of the PCa sub-girder (beam member) so that it protrudes slightly beyond the beam end face of the PCa sub-girder, and the PCa main girder and the PCa sub-girder are joined with the protruding part of this temporary steel material placed on the metal fittings of the main girder (member to be erected), and the temporary steel material is hidden by a slab that is constructed after this joining (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 03-260235 [Patent Document 2] Special Publication No. 03-068977 Summary of the Invention [Problem to be solved by the invention]

[0005] In the construction method or joining method described in Patent Documents 1-2 above, the members to be erected are multiple main girders or main girder members, and the beam members to be erected between the members to be erected are sub-beams or sub-beam members. Therefore, a supporting steel frame such as a temporary support member or temporary steel material is attached to the upper surfaces of both ends of the beam members with one end extending from the beam end of the beam member in the erection direction of the beam member, and the beam members are then placed between the members to be erected so that one end of the supporting steel frame is placed on the upper surface of the member to be erected. This allows the beam member to be erected between the members to be erected with the height position of its upper surface aligned with the upper surface of the member to be erected. However, with some beam members, it is not desirable to align the height position of their upper surface with the height position of the upper surface of the member to be erected, and when erecting such a beam member between members to be erected, the construction methods or joining methods described in Patent Documents 1-2 above cannot be adopted.Therefore, there is a need to propose a method of erecting a beam member that will enable the beam member to be erected between members to be erected while being positioned at the desired height relative to the members to be erected.

[0006] In view of this situation, the main object of the present invention is to provide a method for erecting a beam member that allows the beam member to be erected between the members to be erected while being positioned at a desired height relative to the members to be erected. [Means for solving the problem]

[0007] A first characteristic configuration of the present invention is a beam member installation method for installing a beam member between a plurality of installation target members, the beam member being disposed between the installation target members, a support steel frame installation process for installing a support steel frame to the beam end of the beam member in a state in which one end of the support steel frame protrudes from the beam end of the beam member in the erection direction of the beam member; a beam member arranging step of arranging the beam member between the members to be erected so that one end of the supporting steel frame is placed on an upper surface of the member to be erected; a beam member erection process of joining the beam end portions of the beam members to the side surfaces of the erection target members to erect the beam members between the erection target members, In the supporting steel frame attaching step, the supporting steel frame is attached to the beam end of the beam member in a state where it is arranged at the upper and lower intermediate portions of the beam member. Removably attached, In the beam member erection step, after joining the beam end of the beam member to the side surface of the erection target member, the support steel frame is removed from the beam end of the beam member. It's at the point.

[0008] According to this configuration, in the supporting steel frame installation process, the supporting steel frame is attached to the beam end of the beam member in a state where it is positioned at the middle position above and below the beam member that is suitable for positioning the beam member at the desired height relative to the member to be erected.In the beam member placement process, one end of the supporting steel frame can be placed on the top surface of the member to be erected, allowing the beam member to be positioned between the members to be erected at the desired height relative to the member to be erected.As a result, in the beam member erection process, the beam member can be erected between the members to be erected at the desired height relative to the member to be erected. As a result, the beam member can be easily positioned at a desired height relative to the members to be erected, and can be erected between the members to be erected in this position. Furthermore, with this configuration, the supporting steel frame removed in the beam member erection process can be reused in the supporting steel frame installation process when erecting other beam members between the members to be erected. As a result, it is possible to simplify component management and reduce steel costs by reducing the number of supporting steel frames installed.

[0009] A second characteristic configuration of the present invention is that the beam member includes a beam portion disposed between the erection target members and a rising portion rising from one end of the beam portion in the beam width direction, In the supporting steel frame mounting process, the supporting steel frame is mounted at the middle portion above and below the beam member with the bottom surface of the supporting steel frame positioned at the boundary between the beam portion and the rising portion.

[0010] According to this configuration, in the supporting steel frame installation process, the supporting steel frame is attached to the beam end of the beam member with its bottom surface located at the boundary between the beam portion and the rising portion of the beam member.Therefore, in the beam member placement process, by placing one end of the supporting steel frame on the top surface of the member to be erected, the beam member can be placed between the members to be erected with the beam portion of the beam member located between the members to be erected and the rising portion of the beam member located above the members to be erected.As a result, in the beam member erection process, the beam member can be erected between the members to be erected with the beam portion of the beam member located between the members to be erected and the rising portion of the beam member located above the members to be erected. As a result, the beam member having the beam portion and the rising portion can be easily erected between the erection target members in an appropriate state.

[0011] The third characteristic configuration of the present invention is A beam member installation method for installing a beam member between a plurality of installation target members, the beam member being disposed between the installation target members, a support steel frame installation process for installing a support steel frame to the beam end of the beam member in a state in which one end of the support steel frame protrudes from the beam end of the beam member in the erection direction of the beam member; a beam member arranging step of arranging the beam member between the members to be erected so that one end of the supporting steel frame is placed on an upper surface of the member to be erected; a beam member erection process of joining the beam end portions of the beam members to the side surfaces of the erection target members to erect the beam members between the erection target members, In the supporting steel frame attaching step, the supporting steel frame is attached to the beam end of the beam member while being disposed at the upper and lower intermediate portions of the beam member. , The beam member includes a beam portion disposed between the installation target members and a rising portion rising from one end of the beam portion in the beam width direction, In the supporting steel frame installation process, With the bottom surface of the supporting steel frame positioned at the boundary between the beam portion and the rising portion, The support steel frame is At the upper and lower intermediate portions of the beam member, The feature is that the beam is attached at a balanced position in the beam width direction that is biased toward the rising portion side from the center in the beam width direction at the boundary between the beam portion and the rising portion.

[0012] According to this configuration, in the supporting steel frame installation process, the supporting steel frame is attached to the beam end of the beam member in a state where it is positioned at the middle position above and below the beam member that is suitable for positioning the beam member at the desired height relative to the member to be erected.In the beam member placement process, one end of the supporting steel frame can be placed on the top surface of the member to be erected, allowing the beam member to be positioned between the members to be erected at the desired height relative to the member to be erected.As a result, in the beam member erection process, the beam member can be erected between the members to be erected at the desired height relative to the member to be erected. As a result, the beam member can be easily positioned at a desired height relative to the members to be erected, and can be erected between the members to be erected in this position. Furthermore, according to this configuration, in the supporting steel frame installation process, the supporting steel frame is attached to the beam end of the beam member with its bottom surface located at the boundary between the beam portion and the rising portion of the beam member.Therefore, in the beam member placement process, by placing one end of the supporting steel frame on the top surface of the member to be erected, the beam member can be placed between the members to be erected with the beam portion of the beam member located between the members to be erected and the rising portion of the beam member located above the members to be erected.As a result, in the beam member erection process, the beam member can be erected between the members to be erected with the beam portion of the beam member located between the members to be erected and the rising portion of the beam member located above the members to be erected. As a result, the beam member having the beam portion and the rising portion can be easily erected between the erection target members in an appropriate state. Moreover,According to this configuration, in the supporting steel frame installation process, the supporting steel frame is installed at a balanced position in the beam width direction at the boundary between the beam portion and the rising portion, so that the lifting posture of the beam member when the supporting steel frame is used to lift the beam member with a lifting machine such as a crane, and the positioning posture of the beam member when one end of the supporting steel frame is placed on the top surface of the member to be erected and the beam member is positioned between the members to be erected, can be easily and stably maintained in a posture suitable for erecting the beam member between the members to be erected. As a result, by providing a rising portion that rises from one end of the beam portion in the beam width direction, a beam member with poor weight balance can be easily erected in an appropriate state between the members to be erected. [Brief explanation of the drawings]

[0015] [Figure 1] A partial cross-sectional front view of the construction process showing the steel support frame installation process and beam member placement process [Figure 2] Partial cross-sectional front view showing the beam member placement process and beam member erection process [Figure 3] Side construction drawing showing the beam member placement process [Figure 4] Partial cross-sectional front view showing the beam erection process DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

[0017] 1 to 4, in the beam member erection method exemplified in this embodiment, when constructing stands for a stadium, arena, etc., a plurality of step beams 1 that are installed in a rear-upward inclined position in the stand construction area are exemplified as a plurality of erection target components 1. The beam member 2 erected between the plurality of step beams 1 includes beam portions 2A that are arranged between the step beams 1, and handrail portions 2B that serve as rising portions 2B that rise from one end of the beam portions 2A in the beam width direction. The beam member 2 may be provided with a waist wall or the like other than the handrail portion 2B as the rising portion 2B.

[0018] As shown in FIGS. 1 to 4 , each step beam 1 and beam member 2 is made of precast reinforced concrete, and the topmost portion 1A of each step beam 1 is set at the installation position of the beam member 2. A plurality of reinforcing bars 11 (four in this embodiment) are embedded in the topmost portion 1A of each step beam 1 and are joined to the main reinforcing bars 21 of the beam member 2. Circular recesses 12 are formed around each reinforcing bar 11 on both the left and right sides of each topmost portion 1A, allowing the reinforcing bars 11 of the step beam 1 to be joined to the main reinforcing bars 21 of the beam member 2 using mechanical joints 22 built into the beam portion 2A of the beam member 2. Recesses (cotters) 13, 23 are formed on both the left and right sides of each topmost portion 1A and on the beam end faces of the beam members 2 joined to these sides to more efficiently integrate the reinforcing bars 11 and the main reinforcing bars 21 of the beam member 2 when filling the spaces between them with a hardening filler 3 such as non-shrink mortar or concrete. The handrail portion 2B of the beam member 2 is provided with a protruding portion 2Ba that protrudes to the center of the left and right of the topmost portion 1A when placed on the top surface of the topmost portion 1A when the beam portion 2A is placed between the topmost portions 1A of the step beam 1. In addition, each stage beam 1 may be set at a position where the beam member 2 is erected, for example, at an intermediate portion above or below, other than the uppermost stage portion 1A.

[0019] Regarding the method of erecting the beam member 2, as shown in Figures 1 to 4, the method of erecting the beam member 2 includes a support steel frame installation process in which a pair of support steel frames 4 used to erect the beam member 2 are attached to the beam member, a beam member placement process in which the beam member 2 is placed between the step beams 1 using the support steel frames 4, and a beam member erection process in which the beam member 2 is erected between the step beams 1. For the support steel frame 4, for example, shaped steel materials such as H-shaped steel and channel steel can be used.

[0020] In the support steel frame installation process, as shown in Fig. 1, a plurality of anchor bolts 5 are used to removably attach support steel frames 4 to the beam end of beam member 2 with one end projecting from the beam end of beam member 2 in the erection direction of beam member 2. As shown in Figs. 1 and 3, each support steel frame 4 is attached to the middle portion above and below beam member 2 with its bottom surface located at the boundary between beam portion 2A and handrail portion 2B of beam member 2, specifically, with the bottom surface of each support steel frame 4 placed on the top surface of beam portion 2A which is the boundary between beam portion 2A and handrail portion 2B of beam member 2, and at a balance position that maintains weight balance in the beam width direction of beam member 2, which is biased toward handrail portion 2B from the center of beam member 2 in the beam width direction.

[0021] In the beam member placement process, as shown in Figures 1 to 3, the hook of a lifting machine such as a crane (not shown) is attached to the sling portion 4A provided on each supporting steel frame 4 via a sling wire rope 6 or the like, and then the beam member 2 together with the supporting steel frame 4 is lifted by the lifting machine up to above the topmost portion 1A of the step beam 1, and the beam portion 2A of the beam member 2 is placed between the topmost portions 1A of the step beam 1 so that one end of each supporting steel frame 4 extending from the beam end of the lifted beam member 2 is placed on the top surface of the topmost portion 1A of the step beam 1, and one end of each supporting steel frame 4 together with the extending portion 2Ba of the handrail portion 2B is placed on the top surface of the topmost portion 1A of the step beam 1. At this time, the load of the beam member 2 is received by the uppermost portion 1A of the step beam 1 via the left and right support steel frames 4. In addition, a gap large enough for a worker to put his / her hand in is formed between the side surface of the uppermost portion 1A of the step beam 1 and the beam end face of the beam portion 2A of the beam member 2.

[0022] 2, in the beam member erection process, first, using the gap between the side surface of the above-mentioned top stage portion 1A and the beam end face of the beam portion 2A, the sleeves 22A of each mechanical joint 22 built into the beam portion 2A of the beam member 2 are pulled out from the beam portion 2A and inserted into the recesses 12 formed in the side surface of the top stage portion 1A of the opposing step beam 1 and fitted into the reinforcing bars 11 of the top stage portion 1A, thereby joining each main reinforcement 21 of the beam member 2 to each reinforcing bar 11 of the top stage portion 1A via the mechanical joints 22. Then, the gap between the side surface of the above-mentioned top stage portion 1A and the beam end face of the beam portion 2A is filled with hardenable filler 3, and the top stage portion 1A of the step beam 1 and the beam portion 2A of the beam member 2 are integrated. Then, after the topmost section 1A of the step beam 1 and the beam section 2A of the beam member 2 are integrated, as shown in Figure 4, each supporting steel frame 4 can be removed from the beam end of the beam member 2, allowing the supporting steel frame 4 to be reused.

[0023] That is, according to this method for erecting the beam member 2, in the supporting steel frame installation process, each supporting steel frame 4 is attached to the beam end of the beam member 2 with its bottom surface positioned at the boundary between the beam portion 2A and the handrail portion 2B of the beam member 2. Therefore, in the beam member arrangement process, when one end of each supporting steel frame 4 is placed on the top surface of the uppermost portion 1A of the step beam 1, the beam portion 2A of the beam member 2 is positioned between the uppermost portion 1A of the step beam 1, and both overhanging portions 2Ba of the handrail portion 2B are positioned on the uppermost portion 1A of the step beam 1. As a result, the beam member 2 can be properly positioned between the step beams 1 in a stable state in which each beam end side is supported at two points on the topmost part 1A of the step beam 1 via the supporting steel frame 4 and the protruding part 2Ba.As a result, in the beam member erection process, the beam member 2 can be erected between the step beams 1 in a proper state in which the beam part 2A of the beam member 2 is positioned between the topmost part 1A of the step beams 1 and the handrail part 2B of the beam member 2 is positioned above the topmost part 1A of the step beams 1.

[0024] Furthermore, during the support steel frame installation process, each support steel frame 4 is installed in a balance position that maintains a balance of the weight of the beam member 2 in the beam width direction at the boundary between the beam portion 2A and the handrail portion 2B of the beam member 2.Therefore, when the beam member 2 is lifted using a lifting machine such as a crane using each support steel frame 4, and when one end of each support steel frame 4 is placed on the top surface of the topmost portion 1A of the step beam 1 and the beam member 2 is placed between the step beams 1, the lifting posture of the beam member 2 can be easily and stably maintained in a posture suitable for erecting the beam member 2 between the step beams 1.

[0025] After the beam member 2 is erected between the step beams 1, each supporting steel frame 4 is removed from the beam member 2, so that the removed supporting steel frame 4 can be reused in the supporting steel frame installation process when erecting another beam member 2 between the step beams 1.

[0026] As a result, the beam member 2, which has a poor weight balance due to the provision of the handrail portion 2B rising from one end of the beam portion 2A in the beam width direction, can be easily erected in an appropriate state between the step beams 1. Furthermore, by reducing the number of supporting steel frames 4 installed, it is possible to facilitate member management and reduce steel costs.

[0027] [Another embodiment] Another embodiment of the present invention will now be described. The configurations of the other embodiments described below are not limited to being applied alone, but can also be applied in combination with the configurations of the above-described embodiment or other other embodiments.

[0028] (1) In the above embodiment, when each support steel frame 4 is attached to the middle portion between the top and bottom of the beam member 2 in the support steel frame attachment process, the bottom surface of each support steel frame 4 is attached in a state where it is placed on the top surface of the beam portion 2A. However, this is not limited to this, and for example, the side surface of each support steel frame 4 may be attached to the bottom of the rising portion 2B so that the bottom surface of each support steel frame 4 is located at the boundary between the beam portion 2A of the beam member 2 and the rising portion (handrail portion) 2B.

[0029] (2) In the above embodiment, an example was given in which each support steel frame 4 is removably attached to the beam end of the beam member 2 in the support steel frame installation process, and after the step beam 1 and the beam member 2 are integrated in the beam member erection process, each support steel frame 4 is removed from the beam end of the beam member 2 and reused. However, this is not limited to this, and for example, each support steel frame 4 may be left in its original state without being removed from the beam end of the beam member 2, or each support steel frame 4 may be covered with post-cast concrete without being removed from the beam end of the beam member 2. [Explanation of symbols]

[0030] 1. Erection target member (beam) 2 Beam members 2A beam part 2B Rising section (handrail section) 4 Support steel frame

Claims

1. A beam member installation method for installing a beam member between a plurality of installation target members, the beam member being disposed between the installation target members, a support steel frame installation process for installing a support steel frame to the beam end of the beam member in a state in which one end of the support steel frame protrudes from the beam end of the beam member in the erection direction of the beam member; a beam member arranging step of arranging the beam member between the members to be erected so that one end of the supporting steel frame is placed on an upper surface of the member to be erected; a beam member erection process of joining the beam end portions of the beam members to the side surfaces of the erection target members to erect the beam members between the erection target members, In the support steel frame attaching step, the support steel frame is removably attached to the beam end of the beam member in a state where it is arranged in the upper and lower intermediate portion of the beam member, In the beam member erection process, the beam end of the beam member is joined to the side of the member to be erected, and then the supporting steel frame is removed from the beam end of the beam member.

2. The beam member includes a beam portion disposed between the installation target members and a rising portion rising from one end of the beam portion in the beam width direction, A method for erecting a beam member as described in claim 1, wherein in the supporting steel frame installation process, the supporting steel frame is installed at the upper and lower middle positions of the beam member with the bottom surface of the supporting steel frame positioned at the boundary between the beam portion and the rising portion.

3. A method for erecting a beam member, in which a beam member disposed between a plurality of erection target members is erected between the erection target members, comprising: a support steel frame installation process for installing a support steel frame to the beam end of the beam member in a state in which one end of the support steel frame protrudes from the beam end of the beam member in the erection direction of the beam member; a beam member arranging step of arranging the beam member between the members to be erected so that one end of the supporting steel frame is placed on an upper surface of the member to be erected; a beam member erection process of joining the beam end portions of the beam members to the side surfaces of the erection target members to erect the beam members between the erection target members, In the supporting steel frame attaching step, the supporting steel frame is attached to the beam end of the beam member in a state where it is arranged in the upper and lower intermediate portion of the beam member, The beam member includes a beam portion disposed between the installation target members and a rising portion rising from one end of the beam portion in the beam width direction, In the supporting steel frame installation process, the bottom surface of the supporting steel frame is positioned at the boundary between the beam portion and the rising portion, and the supporting steel frame is installed at the middle part of the beam member between the top and bottom, at a balanced position in the beam width direction that is biased toward the rising portion side rather than the center of the beam width direction at the boundary between the beam portion and the rising portion.This is a method of erecting a beam member.

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