Method for forming vehicle access routes for buildings under construction and a rotating support device for beams

Abstract

This invention provides a method for creating vehicle access routes for buildings under construction, which allows for the installation of large pump trucks and agitator trucks on the construction site after the steel frame and other structures have been erected, thereby increasing the rate of concrete pouring. [Solution] This method is a method for forming a vehicle access route for a building under construction, which is formed in the floor area of ​​the building 5 after the beam 1 is assembled to the column 2, and involves temporarily supporting the beam 1 so that it can rotate by opposing short beam sections (brackets) 11, 11 on the second floor side that are fixed to the columns 2, 2 on both sides of the location to be used as the vehicle access route, thereby increasing the height of the beam below the first floor.

Description

Technical Field

[0001] This invention relates to a method for forming a vehicle access route for a building under construction and a rotational support device for a beam.

Background Art

[0002] In a narrow site where vehicles such as a pump truck and an agitator truck cannot be installed within the site, these pump trucks and agitator trucks have to be installed using the road in front of the site. For example, in a CFT (Concrete Filled steel Tube) column, while it is required to keep the filling speed of the fresh concrete filled in this column within a certain range, there are many restrictions on the work on the road in front of the site. It takes a lot of time to replace the agitator truck, and it is not easy to keep the filling speed of the fresh concrete within a certain range. If the filling speed of the fresh concrete becomes slow, the hardening of the fresh concrete in the steel pipe progresses, and there is a risk that the filling of the fresh concrete becomes difficult. On the other hand, even when a pump truck and an agitator truck can be installed within the site after the steel frame construction method, when only medium and small-sized vehicles with a relatively small loading capacity of fresh concrete, which are difficult to install large agitator trucks, are installed, the number of vehicle replacements increases, the time required for vehicle replacement increases, the placing speed of the fresh concrete cannot be increased, and the waiting time of the workers and the total number of personnel including the road guards also increase.

[0003] Patent Document 1 discloses a concrete transport vehicle that can be operated simply, accurately, and safely even in a narrow site.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the concrete transport vehicle described in Patent Document 1 above is likely to be expensive due to its special structure, and construction using such a concrete transport vehicle may result in higher construction costs.

[0006] The objective of this invention is to provide a method for forming vehicle access routes for a building under construction and a rotating support device for beams, which will enable the installation of large pump trucks and agitator trucks on the construction site after the building is erected, thereby increasing the rate of concrete pouring, while suppressing the increase in construction costs. [Means for solving the problem]

[0007] The present invention provides a method for forming a vehicle access path for a building under construction, which solves the above-mentioned problems by forming a path for vehicles to enter the floor area of ​​a building under construction after the beams have been assembled to the columns. The method is characterized by temporarily supporting the beams so that they can rotate using short beam sections on the floor directly above the access path, which are fixed to the columns on both sides of the location to be used as a vehicle access path and face each other, thereby increasing the height of the beam below the first floor.

[0008] With the above method, the beams between the columns on both sides of the access route for vehicles are rotated to raise the height under the first-floor beams in a building under construction. This makes it possible to bring in and set up large vehicles such as concrete pump trucks and agitator trucks on the construction site. This reduces the increase in construction costs that would otherwise be incurred by using concrete transport vehicles with special structures, and also reduces the time required for vehicle changes by reducing the number of vehicle changes, thereby increasing the speed of concrete pouring. As a result, waiting times for workers and the total number of personnel, including road security guards, are reduced, making it possible to further reduce construction costs. Furthermore, even when a pile driver is brought into the construction site of a building under construction, the beams between the columns on both sides of the access route for the vehicle can be rotated to raise the height under the first-floor beams. In addition, although the beams are rotated as described above, they are not removed and temporarily stored and cured elsewhere, eliminating the troublesome work associated with removal and re-transportation, and also eliminating the need to secure a place for temporary storage and curing.

[0009] A splice plate-like device equipped with a bearing portion may be fixed to the end of the beam and to each of the short beam sections, and the beam may be temporarily supported so as to be rotatable by a pivot shaft passed through the bearing portion. This makes it easier to rotate the beams between the columns on both sides of the area that will be used as a vehicle access route to raise the height of the beams below the first floor.

[0010] After construction, the splice plate that secures the end of the beam and the short beam section to each other may be removed, and the splice plate-like device may be attached.

[0011] Before removing the splice plate that secures the end of the beam and the short beam section to each other, the beam may be suspended by a suspension device connected to the beam on the floor directly above. This prevents the beam from falling.

[0012] The beam may be kept suspended by the lifting device even after the beam has been temporarily rotated by the splice plate-like device described above. This reduces the load on the pivot shaft that passes through the bearing. The lifting device can also be used to level the beam when it is fully secured with the splice plate.

[0013] In the above-mentioned beam, the beam depth dimension is greater than the beam width, the splice plate-like device may be attached to the vertical surface of the beam, and the rotational support position of the beam may be set at an intermediate height position in the beam depth.

[0014] Alternatively, the splice plate-like device may be attached to the vertical surface of the beam, and the rotational support position of the beam may be set to a position higher than the midpoint height of the beam's depth. This method allows for a greater height above the beam on the first floor. Furthermore, even if the beam's depth and beam width are the same, the height above the beam on the first floor can still be increased.

[0015] Alternatively, the splice plate-like device may be attached to the upper surface of the beam. This method allows for a greater height above the beam on the first floor. Furthermore, even if the beam depth and beam width are the same, the height above the beam on the first floor can still be increased.

[0016] Furthermore, the beam rotation support of this invention is a beam rotation support that rotatably supports a beam on a short beam portion fixed to a column, and is characterized by comprising: one splice plate-shaped member fixed to the short beam portion; the other splice plate-shaped member fixed to the beam; and a rotation shaft that passes through bearing portions provided on each of these splice plate-shaped members. [Effects of the Invention]

[0017] With this invention, it becomes possible to bring vehicles such as large pump trucks and agitator trucks into the construction site and set them up. By reducing the number of times such large vehicles need to be changed, the rate of concrete pouring can be increased, reducing waiting time for workers and the total number of personnel including road security guards, resulting in various effects such as reduced construction costs. [Brief explanation of the drawing]

[0018] [Figure 1] This is an explanatory drawing showing a method for forming a vehicle entry path for a building under construction in an embodiment (columns: steel pipes, beams: H-shaped steel). [Figure 2] FIG. (A) is an explanatory drawing showing an example of a vehicle entry path, and FIG. (B) is an explanatory drawing exemplifying the position of a beam to be rotated. [Figure 3] This is an explanatory drawing showing a rotation support tool for a beam in an embodiment. [Figure 4] This is an explanatory drawing showing a 90-degree rotation of a beam by the rotation support tool of the beam in FIG. 3. [Figure 5] This is an explanatory drawing showing a modified example of a method for forming a vehicle entry path for a building under construction in an embodiment. [Figure 6] This is an explanatory drawing showing a modified example of a method for forming a vehicle entry path for a building under construction in an embodiment.

Mode for Carrying Out the Invention

[0019] Hereinafter, embodiments of this invention will be described based on the accompanying drawings. As shown in FIG. 1, for example, in a method for forming a vehicle entry path for a building under construction in an embodiment, a beam 1 made of H-shaped steel with a pair of flanges connected by a web is assembled to a steel pipe column 2, and further braces, miscellaneous steel frames, etc. are also assembled. A path for a vehicle C such as a pump truck or an agitator truck to enter is formed in the floor area of the building 5 under construction after the construction method. The beam 1 is temporarily and rotatably supported by short beam portions (cantilever beams taken out from the column-beam joint: brackets) 11, 11 on the upper floor side (for example, the second floor side) of the path that are fixed to the columns 2, opposite to each other on both sides of the location where the vehicle C enters, and the beam 1 is rotated to increase the height under the first floor beam. In this embodiment, a rotation support tool 4 is used for the temporary rotation of the beam 1.

[0020] The path for the vehicle C to enter is, for example, as shown in Fig. 2(A), a straight path that intersects and penetrates a plurality of beams 1 on the second floor side in the building 5 from the road R in front of the site. Such a plurality of beams 1 on this path are the objects of the above rotation, and the beams 1 outside the path are firmly fixed to the columns 2 by specified bolts. In the range where the beam 1 to be rotated exists, the slab floor has not been constructed, and no floor load acts on these beams 1. Further, as shown in Fig. 2(B), the plurality of beams 1 on the second floor side on the above path are suspended by suspension devices W attached to their respective upper floor side beams. The suspension device W is a hoisting device such as a chain block, and the tip of its suspension cable (such as a wire) is hooked, for example, to an eyebolt fixed to the flange of the beam 1.

[0021] The above rotation support 4 is for rotatably supporting the beam 1 on the short beam portion 11 fixed to the column 2. As also shown in Fig. 3, it includes a splice plate-like member 41 on one side bolted to the web (vertical surface portion) of the short beam portion 11, a splice plate-like member 42 on the other side bolted to the web of the beam 1, and a rotation shaft 43 passed through bearing portions 41a and 42a provided on these splice plate-like members 41 and 42 respectively. Further, retaining members 43a are attached to both ends of the rotation shaft 43. The splice plate-like members 41 and 42 may be shorter than the splice plate (having a length extending from the short beam portion 11 to the beam 1), which is the original beam joining means, and the number of temporary bolts to be tightened (see the black circles in Fig. 3) may also be fewer. Specifically, it is set to 1 / 2 and two or more with respect to a group of bolts.

[0022] Thus, in this embodiment, the rotation support 4 is used. Splice plate-like members 41 and 42 provided with bearing portions 41a and 42a are fixed to each of the end of the beam 1 and the short beam portion 11, and the beam 1 is temporarily made rotatable by the rotation shaft 43 passed through the bearing portions 41a and 42a. By using the rotation support 4 in this way, the operation for rotating the beam 1 between the two columns 2, 2 on both sides of the location where the path for the vehicle C to enter is set to increase the height under the first floor beam becomes easier.

[0023] Furthermore, with the above-described method for forming a vehicle entry path, in a building 5 under construction, the beam 1 between columns 2,2 on either side of the location designated as the entry path for vehicle C can be rotated to increase the height under the beam on the first floor. In this embodiment, the beam 1 is of a type in which the beam depth is greater than the beam width, and the pivot axis 43 (rotation support position) of the rotation support 4 is attached at an intermediate height position in the beam depth of the beam 1. As shown in Figure 4, by rotating the beam 1 90 degrees around the pivot axis 43, the height under the beam on the first floor can be increased by H. If H is the distance from the center of the pivot axis 43 to the center of the web thickness, then H = (beam depth - beam width) / 2 + S.

[0024] This makes it possible to bring large pump trucks and agitator trucks into the construction site (including the building's floor area) as vehicle C and set them up, suppressing the increase in construction costs that would otherwise be incurred by using specially constructed concrete transport vehicles. Furthermore, by reducing the number of times large vehicles need to be changed, the rate of concrete pouring can be increased. In addition, waiting times for workers and the total number of personnel, including road security guards, will be reduced, making it possible to further reduce construction costs.

[0025] Furthermore, even when a pile driver (vehicle C) is brought into the construction site of a building under construction to perform pile driving work, the beam 1 between columns 2, 2 on either side of the path through which the pile driver enters can be rotated to increase the height of the beam below the first floor. In addition, although beam 1 is rotated as described above, it is not removed and temporarily stored and protected elsewhere, thus eliminating the troublesome work associated with removal and re-transportation, and further eliminating the need to secure a place for temporary storage and protection.

[0026] In the method for forming a vehicle access path to the building 5 under construction described above, after the steel frame of building 5 is erected, the splice plates (which may be temporarily fixed during erection) that fix the end of beam 1 and the short beam section 11 to each other are removed, and splice plate-like devices 41 and 42 are attached. For example, for the upper flange side and lower flange side of the end of beam 1 and the short beam section 11, the splice plates that fix these sides are left attached, the splice plates on the web side are removed, and the splice plate-like devices 41 and 42 are attached to the web. After that, the splice plates that fix the upper flange side and lower flange side are removed, allowing the beam 1 to rotate.

[0027] Before removing the splice plate that secures the end of beam 1 and the short beam section 11 to each other, beam 1 may be suspended by a suspension device W connected to the second-floor beam, thereby preventing beam 1 from falling.

[0028] Even after the beam 1 has been temporarily rotated by the splice plate-like devices 41 and 42, the beam 1 may continue to be suspended by the suspension device W. This reduces the load on the rotation axis 43 of the rotation support device 4. After the beam 1 has been temporarily rotated, although not shown in the figures, the temporarily rotated state of the beam 1 may be maintained by, for example, fastening an L-shaped plate or the like to the flange or web of the beam 1 and the short beam section 11, or by providing a locking mechanism on the rotation axis 43 of the rotation support device 4.

[0029] Once the concrete filling process by vehicle C is complete and vehicle C no longer needs to enter the building 5 under construction, the multiple beams 1 along the above route are rotated to their correct positions, and both ends of each beam 1 are fixed to the short beam section 11 using specified bolts and splice plates, and the lifting devices W and eye bolts are removed. Then, on these fixed beams 1, for example, deck plates are laid, reinforcement is added, and concrete is poured to create a slab floor.

[0030] In the above-described method for forming a vehicle access path for building 5 under construction, the rotating support 4 was installed so that its pivot axis 43 (rotating support position) was located at the midpoint of the beam depth of the beam 1, but this is not limited to this. As shown in Figure 5, the rotating support 4 may be installed at a position where its pivot axis 43 (rotating support position) is higher than the midpoint of the beam depth of the beam 1. With this method, by rotating the beam 1 90 degrees around the pivot axis 43, the lower end of the beam 1 when rotated can be made higher than H at the first-floor beam height. Furthermore, with this method, the first-floor beam height can be increased even if the beam depth and beam width of the beam 1 are the same. If it is not easy to rotate the beam 1 around the pivot axis 43 manually, the lower flange of the beam 1 can also be suspended by the suspension device W, and the beam 1 can be rotated around the pivot axis 43 by operating this suspension device W.

[0031] Furthermore, the method for forming a vehicle access path to the building 5 under construction is not limited to the methods exemplified above. As shown in Figure 6, splice plate-like devices 41 and 42 may be attached to the upper flange, which is the upper surface of the beam 1. With this method, by rotating the beam 1 180 degrees around the pivot axis 43 (rotation support position), the lower end of the beam 1 when rotated can be made higher than the above H. Also, with this method, even if the beam depth and beam width of the beam 1 are the same, the height under the beam on the first floor can be increased. Note that it is not easy to rotate the beam 1 around the pivot axis 43 by hand, so the lower flange of the beam 1 is also suspended by a suspension device W, and the beam 1 is rotated around the pivot axis 43 by operating this suspension device W.

[0032] In the above example, beam 1 was rotated 90 or 180 degrees around the pivot axis 43, but the rotation angle is not limited to these.

[0033] Although embodiments of this invention have been described above with reference to the drawings, this invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as this invention, or within the equivalent scope. [Explanation of Symbols]

[0034] 1:Beam 2: Pillar 4: Rotating support 5: Building 11: Short beam section 41: Splice plate-shaped device 41a: Bearing section 42: Splice plate-shaped device 42a: Bearing section 43: Rotary shaft 43a: Anti-slip C: Vehicle R: road W: Lifting device

Claims

1. A method for forming a vehicle access route for a building under construction, which involves assembling beams to columns and forming a route for vehicles to enter the floor area of ​​the building under construction, characterized in that the beam is temporarily supported so as to be rotatable by opposing short beam sections on the floor directly above the route, which are fixed to the columns on both sides of the location to be used as the vehicle access route, and the beam is rotated to increase the height of the beam below the first floor.

2. A method for forming a vehicle access path for a building under construction according to claim 1, characterized in that a splice plate-shaped device having a bearing portion is fixed to the end of the beam and the short beam portion, and the beam is temporarily supported so as to be rotatable by a pivot shaft passed through the bearing portion.

3. A method for forming a vehicle access path for a building under construction according to claim 2, characterized in that, after erection, the splice plate fixing the end of the beam and the short beam portion to each other is removed and the splice plate-like device is attached.

4. A method for forming a vehicle access path for a building under construction according to claim 3, characterized in that, before removing the splice plate that fixes the end of the beam and the short beam portion to each other, the beam is suspended by a suspension device connected to the beam on the floor directly above.

5. A method for forming a vehicle access path for a building under construction according to claim 4, characterized in that the beam is kept suspended by the suspension device even after the beam is temporarily rotated by the splice plate-like device.

6. A method for forming a vehicle access path for a building under construction according to any one of claims 2 to 5, wherein the beam has a depth dimension greater than the beam width, the splice plate-like device is attached to the vertical surface of the beam, and the rotational support position of the beam is set to an intermediate height position of the beam depth.

7. A method for forming a vehicle access path for a building under construction according to any one of claims 2 to 5, characterized in that the splice plate-like device is attached to the vertical surface of the beam, and the rotational support position of the beam is set to a position higher than the midpoint height of the beam depth of the beam.

8. A method for forming a vehicle access path for a building under construction according to any one of claims 2 to 5, characterized in that the splice plate-shaped device is attached to the upper surface of the beam.

9. A rotating support for a beam that rotatably supports a short beam section fixed to a column, comprising: one splice plate-shaped member fixed to the short beam section; the other splice plate-shaped member fixed to the beam; and a rotating shaft that passes through bearing portions provided on each of these splice plate-shaped members.

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