Horizontal adjustment mechanism for scaffolding used in hollow facilities

Abstract

To provide a horizontal adjustment mechanism of a scaffold for a cavity facility that can smoothly install upper layer scaffold blocks so as to be in a horizontal state when installing it.SOLUTION: The present invention relates to a horizontal adjustment mechanism of a scaffold 1 for a cavity facility constructed by stacking and installing multiple scaffold blocks 30 to a boiler furnace with a cavity therein. Each scaffold block 30 comprises: a frame part 3 rectangular in plan view for supporting a work floor part where a field worker conducts work; a pair of diagonal members 9 each provided along a longer direction side of the frame part 3 and each extending in an oblique direction from both end parts; and connection members 10 connected to tip parts of the pair of diagonal members 9 and tiltably connected to the pair of diagonal members 9. The pair of diagonal member 9 and the connection member 10 are provided with inclination restriction means for restricting an inclination angle of the connection member 10.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a horizontal adjustment mechanism for a scaffold for cavity equipment provided inside cavity equipment such as a boiler furnace of a thermal power plant, for example.

Background Art

[0002] Conventionally, cavity equipment such as a boiler furnace of a thermal power plant, for example, is formed in a substantially hollow rectangular prism shape having a cavity inside, and its bottom part has a hopper structure that tapers downward (see, for example, Patent Document 1). A scaffold 1 for cavity equipment is assembled and provided on this bottom part B. The scaffold 1 for cavity equipment is used, for example, during maintenance such as repair inside the boiler furnace. A plurality of scaffolds 1 for cavity equipment are provided at a predetermined interval in the longitudinal direction of the bottom part B of the boiler furnace.

[0003] As shown in FIG. 8, the scaffold 1 for cavity equipment is formed by a plurality of scaffold blocks 30 (hereinafter, when collectively referring to the scaffold blocks, the reference numeral 30 is used) being respectively lifted and moved by, for example, a crane or the like and installed at a desired position. In the scaffold 1 for cavity equipment, a first scaffold block 31 is installed at the lowermost part of the bottom part B, and a second scaffold block 32 and a third scaffold block 33 are installed substantially symmetrically left and right when viewed from the side direction on its upper layer. Further, three scaffold blocks 30 are installed so as to spread in the left - right direction on its upper layer.

[0004] Here, for example, as shown in FIG. 9, the first scaffold block 31 is generally constituted by a frame - shaped frame 36 having a pair of side wall portions 35, a work floor 37 placed and provided on the frame 36, a pair of portal columns 38 extending in the height direction from both ends of the frame 36, a pair of diagonal members 39 extending obliquely from both ends of the frame 36 and formed in a substantially mountain shape, and a pair of handrail portions 40 provided between the pair of portal columns 38 and the like.

[0005] Each of the upper ends of the pair of diagonal members 39 is provided with a connecting member 41 that connects them. As shown in Figure 10, the connecting member 41 has a pair of opposing side portions 42 and a connecting portion 43 that connects these side portions 42, and is formed in a substantially H shape when viewed from the side. In the connecting member 41, the pair of diagonal members 39 are rotatably connected to the lower recess of the connecting portion 43 such that their upper ends are fitted into it. On the other hand, although not shown, the frames 36 of the upper second and third scaffolding blocks 32 and 33 are connected to the upper recess of the connecting portion 43 such that they are fitted into it, and the second and third scaffolding blocks 32 and 33 are installed on the first scaffolding block 31. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-184283 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Here, before the scaffolding blocks 32 and 33 are installed on the first scaffolding block 31, there is nothing pressing down on the connecting member 41 from above, so the connecting member 41 is in a state where it can tilt freely with respect to the pair of diagonal members 39. As a result, as shown in Figure 11(a), the connecting member 41 may tilt until the lower end of its connecting portion 43 (see A in the figure) comes into contact with one of the diagonal members 39, and may tilt to an extreme angle of, for example, about 45 degrees or more.

[0008] If the connecting member 41 is tilted to such an extreme degree, and the second scaffolding block 32 is to be installed, for example, as shown in Figure 12, the frame 36 of the second scaffolding block 32 may ride up onto the recess on the upper side of the connecting member 41, making it impossible to install the second scaffolding block 32 horizontally. Therefore, when a worker assembling the scaffolding 1 for the hollow facility installs the second scaffolding block 32 above the first scaffolding block 31, they must support the pair of diagonal members 39 of the first scaffolding block 31 with both hands to maintain the horizontal position of the connecting member 41, and then install the second scaffolding block 32, which results in a very cumbersome process.

[0009] The present invention was conceived under the circumstances described above, and its objective is to provide a horizontal adjustment mechanism for scaffolding for hollow facilities that allows the upper scaffolding blocks to be installed smoothly and in a horizontal position. [Means for solving the problem]

[0010] The horizontal adjustment mechanism for scaffolding for hollow facilities provided by the present invention is a horizontal adjustment mechanism for scaffolding for hollow facilities constructed by stacking and installing a plurality of scaffolding blocks on top of a hollow facility having a cavity inside, wherein each scaffolding block comprises a rectangular frame portion in plan view that supports a work platform on which on-site workers perform work, a pair of support columns extending in the height direction from both ends of the frame portion, a pair of diagonal members provided along the longitudinal side surface of the frame portion and extending diagonally from both ends, and a connecting member connected to the tip of the pair of diagonal members and connected to the pair of diagonal members in a tiltable manner, Each of the aforementioned diagonal members has a chamfered portion cut diagonally at the corner of its tip, and the connecting member is composed of a pair of opposing flat side portions and a connecting portion that connects the pair of side portions and extends inward from the center of the two side portions. When installing another scaffolding block above a lower scaffolding block among the multiple scaffolding blocks, the connecting member of the lower scaffolding block tilts due to its own weight, and the chamfered portions of the pair of diagonal members come into contact with the connecting portion of the connecting member, and the chamfered portions of the pair of diagonal members come into contact with each other, thereby restricting the inclination angle of the connecting member. It is characterized by the following.

[0012] In the horizontal adjustment mechanism for scaffolding for hollow facilities of the present invention, the connecting member is The lower layer It is placed on top of the scaffolding blocks. The aforementioned It is preferable to use it to connect to the frame portion of other scaffolding blocks. [Effects of the Invention]

[0013] According to the present invention, a pair of diagonal members provided on the scaffolding block and a connecting member connected to their ends are provided with a tilt restricting means that restricts the tilt angle of the connecting member. Therefore, when installing the upper scaffolding block, the upper scaffolding block will not ride up onto the connecting member due to an extreme tilt, and the upper scaffolding block can be installed smoothly and in a horizontal position. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic perspective view showing the configuration of a first scaffolding block to which the horizontal adjustment mechanism for scaffolding for hollow facilities of the present invention is applied. [Figure 2] The diagram shows the external shape of the diagonal members, with (a) being a front view, (b) a side view, and (c) a top view. [Figure 3] The images show the external shape of the connecting member, with (a) being a front view, (b) a side view, and (c) a top view. [Figure 4] The diagram shows the connection between the diagonal member and the connecting member when the connecting member is in a horizontal position, with (a) being a front view and (b) being a side view. [Figure 5] The diagram shows the connection between the diagonal member and the connecting member when the connecting member is tilted, with (a) being a front view and (b) being a side view. [Figure 6] This diagram shows the connection between the first scaffolding block and the second scaffolding block. [Figure 7] This is a schematic perspective view of the cavity facility. [Figure 8] Figure 7 is a schematic side view of the scaffolding for the cavity facility, which will be installed in the cavity facility shown in Figure 7. [Figure 9] This is a schematic perspective view showing a conventional scaffolding block. [Figure 10] The image shows the conventional connection between the diagonal member and the connecting member when the connecting member is in a horizontal position, with (a) being a front view and (b) being a side view. [Figure 11] The diagram shows the conventional connection state between the diagonal member and the connecting member when the connecting member is tilted, with (a) being a front view and (b) being a side view. [Figure 12]It is a diagram showing the connection state of a conventional first scaffold block and a second scaffold block.

Embodiments for Carrying out the Invention

[0015] Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

[0016] In the following description, the drawings referred to in the [Background Art] section will be referred to again. Also, the same members as those described in the [Background Art] section are denoted by the same reference numerals.

[0017] The horizontal adjustment mechanism of the scaffold 1 for cavity equipment according to the present embodiment is applied to cavity equipment such as a boiler furnace in a thermal power plant. The boiler furnace of the thermal power plant has an overall structure formed in a substantially hollow quadrangular prism shape having a cavity inside, and its bottom B has a hopper structure that tapers downward as shown in FIG. 7.

[0018] As shown in FIG. 8, the scaffold 1 for cavity equipment is formed by stacking a plurality of scaffold blocks 30. The scaffold 1 for cavity equipment includes a first scaffold block 31 installed at the lowermost part of the boiler furnace, second scaffold blocks 32 and 33 installed symmetrically left and right in the lateral direction on the upper layer thereof, and three scaffold blocks 30 installed so as to extend in the left - right direction on the upper layer thereof.

[0019] FIG. 1 is a schematic perspective view showing the configuration of the first scaffold block 31 to which the horizontal adjustment mechanism of the scaffold 1 for cavity equipment of the present invention is applied.

[0020] In the first scaffold block 31, a substantially flat work floor 4 is supported and provided on the upper part of a frame - like (not shown) frame 3. The frame 3 includes a main body part (not shown) having a substantially rectangular shape in plan view and a pair of side wall parts 5 erected from the left and right end parts of the main body part along the longitudinal direction of the work floor 4. The work floor 4 is for on - site workers to perform work on its upper surface.

[0021] At both ends of the frame 3, a pair of gate-shaped support columns 7 are provided via connecting members 6, connecting a pair of side wall sections 5 and extending in the height direction. The pair of gate-shaped support columns 7 are positioned opposite each other at both ends of the frame 3. These gate-shaped support columns 7 are for supporting the second scaffolding block 32 or the third scaffolding block 33, which will be installed on top of the first scaffolding block 31. Each gate-shaped support column 7 has a connecting member 8 at its upper end, which is formed in a roughly U-shape in side view, for connecting to the second and third scaffolding blocks 32 and 33.

[0022] Between each pair of gate-shaped support columns 7, a pair of diagonal members 9, roughly shaped like a mountain, are provided via connecting members 6. The pair of diagonal members 9 are for supporting the second scaffolding block 32 or the third scaffolding block 33, which will be installed on top of the first scaffolding block 31. The pair of diagonal members 9 are provided along the longitudinal sides of the frame 3, and each diagonal member 9 extends diagonally from the bottom of the gate-shaped support columns 7 along both side walls 5 of the frame 3, approaching each other, and is connected to a connecting member 10 at its tip. The diagonal members 9 and the connecting member 10 will be described later.

[0023] Furthermore, a pair of handrail sections 11 are provided between the pair of gate-shaped support columns 7, extending left and right along the side walls 5 of the frame 3. Each of the pair of handrail sections 11 consists of an upper rail, a middle rail, and a lower rail extending left and right, and three connecting members extending up and down to connect them. The pair of handrail sections 11 are intended to prevent workers from falling while working on the work platform 4.

[0024] Each end of frame 3 is provided with a pair of ladder members 12 that extend diagonally. Each ladder member 12 is for supporting the base plates 14 (described later) of the second and third scaffolding blocks 32 and 33, which are installed on top of the first scaffolding block 31.

[0025] Each of the four ends of the frame 3 is provided with a jack bolt 13 extending in the height direction, and each of the lower ends of the jack bolts 13 is provided with a roughly flat base plate 14. The base plate 14 is positioned at an angle to support the first scaffolding block 31 along the sloped bottom B.

[0026] Here, as shown in Figure 2, each of the diagonal members 9 described above is formed in the shape of a long rectangular pipe. At both ends of the diagonal members 9, on the front side (see Figure 2(a)) and the left and right corners on the back side, chamfered portions 16 cut diagonally are formed. Through holes 17 are formed near both ends of the diagonal members 9. Around each through hole 17, a roughly home plate-shaped reinforcing piece 18 is provided.

[0027] As shown in Figure 3, the connecting member 10 is composed of a pair of substantially flat side portions 21 that are formed in a substantially trapezoidal shape in a front view and are arranged opposite each other, and a connecting portion 22 that connects the pair of side portions 21, and is formed in a substantially H shape in a side view (see Figure 3(b)). The connecting portion 22 is formed extending laterally in the central inner part of the side portion 21. The connecting member 10 allows the upper ends of a pair of diagonal members 9 to rotate freely in the lower recess, while the connecting member 10 connects and supports the second and third scaffolding blocks 32 and 33 in the upper recess.

[0028] Each side portion 21 has two through holes 23 formed in the area below the connecting portion 22, and the upper ends of a pair of diagonal members 9 are connected by bolts 24 (see Figure 4(b)) inserted into each through hole 23.

[0029] Each side portion 21 has three through holes 25 formed in the area above the connecting portion 22, and the frames 3 of the second and third scaffolding blocks 32 and 33 are connected by bolts (not shown) inserted into each through hole 25. The upper ends of both side portions 21 are tapered so as to widen to the left and right in a side view (see Figure 3(b)), making it easier for the frames 3 of the second and third scaffolding blocks 32 and 33 to enter the inside of the connecting member 10 when they are installed.

[0030] Here, as shown in Figure 4, assuming the connecting member 10 is in a horizontal position (normally the connecting member 10 is tilted due to its own weight), the distance L1 (see Figure 4(a)) between the centers of the two through holes 23 (not shown in Figure 4(a)) in the side portion 21 of the connecting member 10 is set to a length such that a small gap S1 is created between the opposing chamfered portions 16 of the pair of diagonal members 9.

[0031] Furthermore, the shortest distance L2 (see the same figure) between the center of the through hole 23 and the connecting portion 22 is set to a length such that a small gap S2 is created between the chamfered portion 16 formed on opposite sides of the pair of diagonal members 9 and the connecting portion 22. In this way, the pair of diagonal members 9 and the connecting member 10 are provided with so-called play due to the gaps S1 and S2 described above.

[0032] As described above, the pair of diagonal members 9 and connecting members 10 are provided with some play. Therefore, for example, after the first scaffolding block 31 is installed at the bottom B of the boiler furnace, and before the second and third scaffolding blocks 32 and 33 are installed, the connecting member 10 is tilted due to its own weight, as shown in Figure 5.

[0033] In the present invention, unlike conventional configurations, the connecting member 10 does not tilt extremely at the upper ends of the pair of diagonal members 9 (see Figure 11). Instead, the tilt angle of the connecting member 10 is restricted to a predetermined angle (for example, 12°) or less. That is, when the connecting member 10 tilts due to its own weight, the corners of the chamfered portions 16 of each diagonal member 9 come into contact with the lower surface of the connecting portion 22 (see T1 and T2 in Figure 5(a)), and the chamfered portions 16 of each diagonal member 9 come into contact with each other (see T3 in the same figure). As a result, the connecting member 10 does not tilt at an angle greater than the tilt angle in the tilted state shown in Figure 5.

[0034] When a second scaffolding block 32 is installed above the first scaffolding block 31 with the inclination angle of the connecting member 10 restricted as described above, the frame 3 of the second scaffolding block 32 fits into the upper recess of the connecting member 10. At this time, the load of the second scaffolding block 32 itself is applied to the connecting member 10, but since the inclination angle of the connecting member 10 is not extremely large, the connecting member 10 naturally transitions from an inclined state to a horizontal state, as shown in Figure 6. The frame 3 of the second scaffolding block 32 is then installed on the connection portion 22 of the connecting member 10.

[0035] Subsequently, the side wall portion 5 of the frame 3 of the second scaffolding block 32 and the connecting member 10 of the first scaffolding block 31 are bolted together, and the first scaffolding block 31 and the second scaffolding block 32 are firmly connected.

[0036] As described above, since there is play in the pair of diagonal members 9 and the connecting member 10, when the upper second scaffolding block 32 is installed above the first scaffolding block 31, the second scaffolding block 32 can be installed smoothly and horizontally. Therefore, on-site workers do not need to perform the extremely cumbersome task of supporting the pair of diagonal members 39 with both hands to maintain the horizontal position of the connecting member 41 before installing the second scaffolding block 32, as in the conventional configuration. Thus, the work efficiency when installing the second scaffolding block 32 above the first scaffolding block 31 can be improved.

[0037] Although Figure 5 shows the connecting member 10 tilted to the left, the connecting member 10 can also tilt to the right. Furthermore, this tilting of the connecting member 10 does not only occur in the first scaffolding block 31, but also in the second scaffolding block 32, the third scaffolding block 33, etc., when the scaffolding block 30 is not installed above it.

[0038] It should be noted that the scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention. For example, the diagonal members 9, connecting members 10, and other members constituting the scaffolding blocks 30 are not limited to the shapes, sizes, quantities, and positional relationships of the embodiments described above. [Explanation of Symbols]

[0039] 1. Scaffolding for hollow facilities 3 frames 4 Work platform 7 Portal post 9 Diagonals 10 Connecting member 16 Chamfered section 21 Side part 22 Connection part 30 scaffolding blocks 31. First scaffolding block 32. Second scaffolding block 33 Third scaffolding block B Bottom (of the boiler furnace) S1, S2 gap

Claims

1. A horizontal adjustment mechanism for scaffolding for hollow facilities, which is constructed by stacking and installing multiple scaffolding blocks on top of a hollow facility having a cavity inside, Each of the aforementioned scaffolding blocks is, A rectangular frame section in plan view supports the work platform where on-site workers perform their tasks, A pair of support columns extending in the height direction from both ends of the frame portion, A pair of diagonal members are provided along the longitudinal side surfaces of the frame portion, and each extends diagonally from both ends, The system includes a connecting member that is connected to the tip of the pair of diagonal members and is also connected to the pair of diagonal members in a way that allows it to be tilted, Each of the aforementioned diagonal members is, Each tip has a beveled edge formed at the corner, cut diagonally. The aforementioned connecting member is A pair of flat, plate-shaped side sections arranged opposite each other, It is composed of a connecting portion that connects the pair of side portions and extends inward from the center of the two side portions, When installing another scaffolding block above a lower scaffolding block among the aforementioned plurality of scaffolding blocks, if the connecting member of the lower scaffolding block tilts due to its own weight, A horizontal adjustment mechanism for scaffolding for hollow facilities, characterized in that the chamfered portions of the pair of diagonal members each abut against the connecting portion of the connecting member, and the chamfered portions of the pair of diagonal members abut against each other, thereby regulating the inclination angle of the connecting member.

2. The aforementioned connecting member is A horizontal adjustment mechanism for scaffolding for hollow facilities according to claim 1, used to connect to the frame portion of the other scaffolding block installed above the lower scaffolding block.

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