JP6872767B2 - Support structure, support method and construction method of suspended scaffolding - Google Patents

Description

The present invention relates to a support structure, a support method and a construction method of a suspended scaffold, and more specifically, for inspection / repair of a girder or a beam of a high-altitude structure such as a T girder bridge, the girder or the beam. It relates to a support structure, a support method and a construction method of a suspension scaffold that suspends the suspension scaffold on the lower side.

Generally, during inspection / repair, repair work, reinforcement work, etc. of bridge structures such as PC (prestressed concrete) valve T girder bridges and elevated structures of plants or large-scale buildings, high-altitude structures A hanging scaffold for work will be temporarily installed underneath. Safety SK panel construction method, perfect construction method, etc. are known as construction methods for suspension scaffolding, but in any construction method, panel materials, face materials, scaffolding boards, etc. are constructed at height by means of cords such as chains, wires, and cables. Suspended from an object, a high-altitude suspension scaffold is formed under the high-altitude structure (Japanese Patent Laid-Open No. 2010-65378, etc.).

As a conventional method of locking or mooring a suspended scaffold to an RC girder or a PC girder of a bridge, a mooring tool such as an anchor bolt that can lock or moor a rope for suspending the suspended scaffold is a concrete girder. A method of driving or embedding in a material or a beam material is known. In this construction method, there is a concern that the reinforcing bars in the concrete will be cut during the construction of anchor bolts, etc., so usually, reinforcing bar exploration etc. is carried out in advance to confirm or investigate the position of the reinforcing bars in the concrete. To. In addition, in this construction method, it is necessary to remove the anchor bolts and repair the installation location after the fact.

On the other hand, techniques for suspending a suspension scaffold from a PC girder or the like without directly installing such a mooring tool on the PC girder or the like are described in, for example, JP-A-2001-90030 and JP-A-2004-360302. It is described in. 14 (A) and 14 (B) are a vertical sectional view and a sectional view taken along line III-III showing the support structure of the suspended scaffold described in these publications.

As shown in FIG. 14, the bridge G is a PC valve T girder bridge in which a plurality of PC valve T girders are arranged in parallel. Each girder D has a lower flange portion F with the lower end of the web portion E enlarged in a bulbous shape. The steel scaffolding support horizontal member B is arranged at the upper surface level (upper haunch level) of the flange portion F. The horizontal member B is oriented in a direction orthogonal to the girder D. Each end of the horizontal member B is placed on the upper surface (haunch surface) Fa of the flange portion F, and is supported by the flange portion F. The horizontal member B forms a hanging source of the cord C. The upper end of the rope C such as a metal chain is locked or moored to the horizontal member B, and the panel, the pipe material, etc. constituting the suspension scaffold A are moored to the lower end of the rope C.

As another technique for suspending a suspended scaffold from a PC girder or the like, a technique for suspending a suspended scaffold with a scaffolding hanging bracket that grips or holds the flange portion F of the T girder is described in Japanese Patent Application Laid-Open No. 2012-122266. There is. 15 (A) and 15 (B) are a vertical sectional view and a sectional view taken along line IV-IV showing the suspended scaffolding support structure of this type.

FIG. 15 shows a scaffolding hanging bracket J that grips or sandwiches the flange portion F from both sides by a pair of locking members M and N. A horizontal member K oriented in a direction orthogonal to the girder D extends along the lower surface of the flange portion F. The locking members M and N are interconnected by a horizontal member K. The locking portions Ma and Na of the locking members M and N abut on the upper surface (haunch surface) Fa of the flange J, and the horizontal member K forms the suspension source of the cord C. The upper end of the rope C is locked or moored to the horizontal member K, and the panel, pipe material, etc. of the suspended scaffold A are moored to the lower end of the rope C.

Japanese Unexamined Patent Publication No. 2010-65378 Japanese Unexamined Patent Publication No. 2001-90030 Japanese Unexamined Patent Publication No. 2004-360302 Japanese Unexamined Patent Publication No. 2012-122266

In the above-mentioned support structure (FIG. 14) in which the horizontal member B for supporting the scaffold is placed on the upper surface of the flange portion F to support the horizontal member B, the total length of the horizontal member B is the web adjacent to each other in terms of construction. It must be set smaller than the side surface (wall surface) separation distance of the portion E (hereinafter referred to as "span S between girders"). Therefore, there is a concern that the horizontal member F may be displaced or rotated during use, and the end portion of the horizontal member B may come off or fall off from the flange portion F. For example, assuming that the horizontal member B and the flange portion F can be relatively displaced by the horizontal external force or the exciting force acting on the bridge G and the suspended scaffolding A in the event of an earthquake or strong wind, the horizontal member B and the flange portion Measures to prevent excessive relative displacement of F are considered to be important.

In this regard, Japanese Patent Application Laid-Open No. 2004-360302 describes a second horizontal member and a support column in the upper region of the horizontal member B, and a three-dimensional frame or a three-dimensional frame structure including the horizontal member B is provided between the girders. It is described that it is arranged in the region α (the region of the span S between girders) to improve the rigidity of the suspended scaffold support structure. However, as can be easily understood by considering the weight, workability, construction cost, construction period, etc., the configuration in which such a complicated and heavy three-dimensional frame or the like is arranged in the inter-girder region α is actually a configuration. Difficult to adopt.

On the other hand, in the support structure (FIG. 15) in which the scaffolding suspension bracket J attached to the PC girder supports the suspension scaffolding, the scaffolding suspension bracket J must be placed directly below or in the vicinity of the girder D. Therefore, there arises a problem that the suspension source cannot be formed in the region α between the girders between the flange portions F. In particular, in a large-scale bridge or the like in which the span S between girders is set to be relatively large, the suspension source interval increases, and a situation may occur in which it is difficult to easily support the suspension scaffold.

Further, the dimensions of the flange portion F of the PC valve T girder, the inclination angle of the haunch surface, and the like are different for each PC girder. FIG. 15C shows the width W1, the protrusion dimension W2, the height V, and the haunch surface inclination angle θ of the flange portion F, but these dimensions or angles are set in a relatively large number of bridge structures. The values to be set are, for example, as follows.
300mm ≤ W1 ≤ 800mm
85mm ≤ W2 ≤ 275mm
250mm ≤ V ≤ 550mm
35 ° ≤ θ ≤ 55 °
The scaffolding hanging bracket J having the above configuration may be provided with a dimensional adjustment mechanism capable of adjusting the dimensions of each part to a certain extent, but is adapted to the dimensional range, the angle range, etc., which differ greatly for each structure. It is extremely difficult to design the scaffolding hanging bracket J so as to be possible.

Further, since the work of expanding this type of suspended scaffold by the worker on the suspended scaffold is a high-place work with relatively poor workability, the workability of such work is improved and this work is easily carried out. Measures to make it possible are desired.

The present invention has been made in view of such a problem, and an object of the present invention is a support structure for a suspension scaffold that supports a horizontal member for supporting the suspension scaffold by a girder or a beam of a high-altitude structure. In the support method, it is possible to reliably prevent excessive displacement, deformation or rotation of the horizontal member supporting the suspended scaffold without arranging a complicated and heavy three-dimensional frame or three-dimensional frame structure in the area between the girders. It is an object of the present invention to provide a support structure and a support method for a suspended scaffold.

The present invention also compares workers on a suspended scaffold in a method of constructing a suspended scaffold that extends a suspended scaffold that supports a horizontal member for supporting the suspended scaffold by a girder or a beam of a high-altitude structure to the unconstructed area. It is an object of the present invention to provide a method for constructing a suspended scaffold in which the suspended scaffold can be easily expanded.

In order to achieve the above object, the present invention has a total length smaller than the separation distance (S) of the side surface or the wall surface of the web portion of the girder or beam of the adjacent high-altitude structure, and the lower flange portion of the girder or beam. By having seating portions at both ends that are seated on the flange portion and supported by the flange portion and seating the seating portion on the upper surface or the haunch surface of the flange portion, an area between adjacent girders or beams can be formed. has a horizontal member of the installation is Ru two points supporting structure, is engaging or anchoring an upper end to Tsumoto portion of lateral bridging material, and a rope for suspending the hanging scaffold on the lower side of the girder or beam In the support structure of the suspended scaffold,
A connecting member for interconnecting a plurality of horizontal members arranged in parallel at intervals, and a web of the girder or beam attached to both ends of the horizontal member and in the axial direction of the horizontal member. part possess a pressing device you press the,
Without forming a three-dimensional frame or a three-dimensional frame in the interspan region (α) above the horizontal member, the girders or beams of the girder or beam in the axial direction of the horizontal member by the pressing devices at both ends of the horizontal member. The reaction force of the girder or beam that presses the web portion and forms a grid-like support structure for suspending the suspension scaffolding from the horizontal member and the connecting member, and acts in the axial direction of the horizontal member. The position of the cross member is constrained by, and the displacement, deformation or rotation of the cross member due to the external force or exciting force acting on the suspended scaffold and its supporting structure during an earthquake or strong wind is prevented. Provided is a support structure for a suspended scaffold, which is characterized in that.

From another point of view, the present invention has a total length smaller than the separation distance (S) of the side surface or wall surface of the web portion of the girder or beam of the adjacent high-altitude structure, and is seated on the lower flange portion of the girder or beam. A horizontal member having a two-point support structure having bearing portions supported by the flange portions at both ends is erected in an area between spans of adjacent girders or beams, and extends in a direction orthogonal to the girders or beams. In the method of supporting a suspended scaffold in which a hanging base of a rope is formed by a horizontal member and the suspended scaffold is suspended by a rope locked or moored to the horizontal member.
The seating portion is seated on the upper surface or the haunch surface of the flange portion .
With pressing the web portion of the girder or beam in the axial direction of the lateral bridging member by a pressing device attached to both ends of the horizontal members, a plurality of horizontal member between which are arranged in parallel spaced Are interconnected by a connecting material to form a grid-like support structure for suspending the suspension scaffolding by the horizontal member and the connecting material .
The position of the horizontal member is constrained by the reaction force of the web portion acting in the axial direction of the horizontal member without forming a three-dimensional frame or a three-dimensional frame in the interspan region (α) above the horizontal member. Provided is a method for supporting a suspended scaffold, which is characterized by preventing displacement, deformation or rotation of the horizontal member due to an external force or a vibrating force acting on the suspended scaffold and its supporting structure during an earthquake or a strong wind. To do.

According to the above configuration of the present invention, the suspended scaffold is suspended by a horizontal member, and the horizontal member is supported by an adjacent girder or a flange portion of a beam. The vertical load of the suspended scaffold acting on the horizontal member is supported by the horizontal member having a two-point support structure with both ends supported by the flanges. The web portion of the girder or beam is pressed by the pressing device, and the reaction force of the web portion acts on the horizontal member as a compressive force in the axial direction to hold or restrain the position of the horizontal member. Therefore, the horizontal member is unlikely to be displaced relative to the girder or the beam, and the support of the horizontal member is structurally stable. As a result, it is possible to prevent excessive displacement, deformation, rotation, etc. of the horizontal member due to a horizontal load, a horizontal exciting force, an unpredictable short-term load acting on the suspended scaffold, or the like. Moreover, the support structure and support method having the above configuration do not require a complicated and heavy three-dimensional frame or three-dimensional frame structure to be arranged in the region between the girders, and therefore, in terms of weight, workability, etc. It is extremely advantageous.

Preferably, the horizontal member is an assembly obtained by assembling a pair of hanging members provided with a pressing device, a beam member for interconnecting the hanging members, and a seat portion arranged below the hanging members. The seating portion is seated on the upper surface or the haunch surface of the flange portion and is supported by the flange portion. According to the horizontal member having such a configuration, the applicable range of the horizontal member with respect to the span dimension of the girder or the beam can be easily changed by exchanging the beam member.

Further , according to the configuration of the present invention in which the grid-like support structure is formed by the connecting material that interconnects the horizontal members, the rigidity of the support structure is improved as a whole, and the cord is suspended by the connecting material. Since the element can be formed, the required number of horizontal members can be reduced.

If desired, a flange enclosure extending downward from the horizontal member is further provided on the horizontal member so as to partially surround the side surface and the lower surface of the flange portion, and the flange enclosure provides a hanging source of the cord just below the flange portion. It may be formed. Further, the hanging base forming member may be additionally arranged in the intermediate region of the beam member, and the hanging base of the cord may be further formed in the region between the hanging base materials.

Preferably, the seat portion is disposed under the Tsumoto material, the Tsumotozai, depending shaft having an axis parallel to the direction center axis of the girder or beam about the axis of the support shaft The seat portion is rotatably supported, and the rotation restraining member provided on the suspension base material is configured to prevent the seat portion from rotating beyond a predetermined angle. According to such a configuration, the seat portion can be easily adapted to the inclination angle of the haunch surface of the flange portion, and excessive rotation of the seat portion can be reliably prevented.

From another point of view, in the present invention, the end portion of the horizontal member is supported by the lower flange portion of the girder or beam of the elevated structure, and the horizontal member is erected in the span-span region of the adjacent girder or beam. , A method of constructing a suspension scaffold in which a suspension base of a rope is formed by the horizontal member extending in a direction orthogonal to the girder or a beam, and the suspension scaffold is suspended by a rope locked or moored to the horizontal member. In
A connecting member (10a) for interconnecting a plurality of horizontal members arranged in parallel is slidably supported on the existing horizontal member (1), and a second horizontal member (1a) is attached to the tip of the connecting member. ) Is tightened, the connecting material is slid toward the unconstructed area (λ) of the suspension scaffold to position the second horizontal member, and the connecting material is tightened to the existing horizontal member (1).
Suspension characterized in that a new cord (Cb) is locked or moored to a second horizontal member, and the scaffolding plate or scaffold panel (Pb) of the suspended scaffold is suspended from the unconstructed area by the cord. Provides a method of building a scaffold.

Preferably, before locking or mooring the cord to the second cross member (Cb), a new cord (Ca) is locked or moored to the interconnect and the scaffolding of the suspension scaffold by the cord. A board or scaffolding panel (Pa) is suspended in the unconstructed area.

According to such a method for constructing a suspended scaffold, after the operator assembles the connecting material and the horizontal member on the suspended scaffold, the connecting material is slid into the unconstructed area, and the cantilever beam is attached to the existing horizontal member. By fixing to the (cantilever) form, a horizontal member for suspending the suspended scaffold can be newly arranged in the unconstructed area of the scaffold. In a preferred embodiment of the present invention, the means for sliding the connecting member is a clamp member in a loosely fitted state (released state), and the means for fixing the connecting member is a clamp member in a tightened state (tightened state). ..

According to the support structure and support method of the suspension scaffold according to the present invention, the support structure and support method of the suspension scaffold that supports the horizontal member for supporting the suspension scaffold by the girder or the beam of the high-altitude structure is complicated and heavy. Excessive displacement, deformation or rotation of the horizontal member supporting the suspended scaffold can be reliably prevented without arranging the three-dimensional frame or the three-dimensional frame structure in the area between the girders.

According to the method for constructing a suspended scaffold according to the present invention, in the method for constructing a suspended scaffold that extends a suspended scaffold that supports a horizontal member for supporting the suspended scaffold by a girder or a beam of a high-altitude structure to the unconstructed area. Workers on the suspended scaffold can expand the suspended scaffold relatively easily.

FIG. 1 is a vertical cross-sectional view of a bridge showing the overall configuration of a suspended scaffolding support structure according to a preferred embodiment of the present invention. 2 (A) to 2 (C) are a plan view, a front view, and a side view showing the structure of the horizontal member, and FIG. 2 (D) shows that the pipe material of the beam member is replaced with a relatively short pipe material. It is a front view of the horizontal member which shows the structure. 3 (A) and 3 (B) are partially enlarged front views of the horizontal member showing the structure of the seat portion and the pressing portion. 4 (A) and 4 (B) are a partially fractured enlarged front view and an enlarged side view showing the structure of the pressing portion according to a more preferred embodiment. 5 (A) and 5 (B) are a plan view and a front view showing a state in which the clamp member and the connecting member are attached to the horizontal member, and FIG. 5 (C) shows the pipe material of the beam member relatively. It is a front view of the horizontal member which shows the structure which exchanged with the short pipe material, FIG. 5 (D) is the cross-sectional view in line I-I of FIG. 5 (B), and FIG. 5 (E) is FIG. 5 (E). It is an enlarged sectional view of the beam member in line II-II of B). FIG. 6 is a perspective view of a suspended scaffolding support structure showing a configuration in which horizontal members arranged in parallel are interconnected by a connecting member. FIG. 7 is a plan view, a front view, a side view, and a bottom view showing a configuration of a hanging base material provided with a flange restraint extending below the flange portion. FIG. 8 is a partial front view of the horizontal member showing the usage pattern of the horizontal member shown in FIG. 7. FIG. 9A is a front view of the horizontal member showing a configuration in which the cord mooring member is arranged at the center of the horizontal member, and FIG. 9B is a horizontal view shown in FIG. 9A. It is a front view which shows the usage form which used the material for the bridge of the steel frame structure. FIG. 10 is a vertical cross-sectional view of the bridge showing the overall configuration of the suspended scaffolding support structure, in which the suspended scaffolding is additionally suspended by the cord mooring member at the center of the horizontal member shown in FIG. 9A. It is shown. FIG. 11 is a vertical cross-sectional view illustrating a method of constructing a suspended scaffold, and the installation process of the suspended scaffold is shown step by step. FIG. 12 is a perspective view showing a method of constructing a suspended scaffold. FIG. 13 is a perspective view showing a method of constructing a suspended scaffold, and shows a step following the step shown in FIG. FIG. 14 is a vertical sectional view and a sectional view taken along line III-III showing a support structure of the suspended scaffold according to the prior art. 15 (A) and 15 (B) are a vertical sectional view and a sectional view taken along line IV-IV showing the configuration of a conventional scaffolding hanging bracket that grips or sandwiches the flange portion of the PC girder by the locking member. 15 (C) is a cross-sectional view showing the main dimensions of the flange portion and the inclination angle of the haunch surface.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1A is a vertical cross-sectional view of a bridge showing the overall configuration of a suspended scaffolding support structure according to a preferred embodiment of the present invention. FIG. 1 (B) is a partially enlarged view of FIG. 1 (A).

1 (A) and 1 (B) show a bridge G having a PC valve T girder bridge structure. The bridge G has a plurality of girders D arranged in parallel at intervals of spans S between girders. The horizontal member 1 for supporting the scaffold is supported by the overhanging portion (haunch surface Fa) of the lower flange portion F of the girder D. The horizontal member 1 constitutes a suspended scaffolding support structure that suspends the suspended scaffolding A under the bridge G.

The horizontal member 1 is a metal or steel assembled beam having a structure in which a beam member 2, a hanging base material 3, a seat portion 4, and a pressing portion 5 are integrally assembled. As will be described later, the horizontal member 1 has a structure in which the total length can be adjusted by adjusting the connection position adjusting mechanism of the beam member 2 and the suspension base material 3. The total length of the horizontal member 1 excluding the pressing portion 5 is adjusted or initially adjusted at the time of assembling the horizontal member 1 so that both end surfaces of the hanging member 3 are arranged at a distance β from the side surface Ea of the web portion E. Set. Preferably, the distance β is the minimum clearance required for construction in arranging the horizontal member 1 at a position on the flange F.

2 (A) to 2 (C) are a plan view, a front view, and a left side view showing the structure of the horizontal member 1, and FIG. 2 (D) shows the suspension material 3 with a relatively short pipe material. It is a front view of the horizontal member 1 which shows the structure which connected each other. 3 (A) and 3 (B) are partially enlarged front views of the horizontal member 1 showing the structures of the seat portion 4 and the pressing portion 5.

The beam member 2 is made of a steel pipe or a metal pipe 20 having a square cross section (hereinafter referred to as “tube body 20”), and both ends of the pipe body 20 are square (square) as shown in FIG. 2 (A). ) It is inserted into the pipe body portion 30 of the suspension base material 3 made of a steel pipe or a metal pipe having a cross section. A large number of positioning holes 21 are bored on both side surfaces of the tubular body 20, and positioning holes 31 that can be matched with the positioning holes 21 are bored on both side surfaces of the tubular body portion 30. A locking tool 22 having shaft portions 22a and 22b that can be inserted into the aligned positioning holes 21 and 31 is moored to the suspension base material 3 by a cord such as a metal wire. By inserting the shaft portions 22a and 22b of the locking tool 22 into the positioning holes 21 and 31, the positional relationship between the tubular body 20 and the tubular body portion 30 can be fixed.

The hanging material 3 has a bracket 33 that hangs down from the lower surface of the tubular body portion 30. The bracket 33 has a square opening 34 and a circular opening 35. The square opening 34 is an opening for mounting a clamp, which will be described later, and the circular opening 35 is an opening for penetrating the rope for mooring or locking the rope C (FIG. 1) to the hanging material 3. .. Further, a pressing portion 5 is disposed on the upper surface of the outer end portion of the hanging base material 3, and a receiving portion 4 is disposed on the lower portion of the outer end portion of the hanging base material 3.

The horizontal member 1 shown in FIGS. 2 (A) and 2 (B) is preset so as to adapt to the range of the span S between girders = 1500 mm to 2000 mm, and the total length of the horizontal member 1 including the pressing portion 5 is set. L1 is set shorter than 2000 mm by a dimension ΔL × 2 in the states of FIGS. 2A and 2B in which the locking tool 22 is inserted into the positioning holes 21 and 31 at the maximum length position. On the other hand, the horizontal member 1 shown in FIG. 2 (D) is set to adapt to the span S between girders = 1000 mm to 1500 mm, and a pipe material having a relatively short overall length is used as the beam member 20, and the horizontal member 1 is used. The total length L1 of the material 1 is set shorter than 1000 mm by a dimension ΔL × 2 in the state of FIG. 2D in which the locking tool 22 is inserted into the positioning holes 21 and 31 at the minimum length position. That is, when the span S between the girders of the bridge G on which the horizontal member 1 is to be installed is significantly different, the applicable span range of the horizontal member 1 is changed as desired by replacing the beam member 20. be able to. Further, in order to adjust the total length L1 of the horizontal member 1 with respect to the span S between the girder members, the matching positioning holes 21 and 31 are changed to change the shaft portions 22a and 22b of the locking tool 22 to the positioning holes 21 and 31. Therefore, the positioning holes 21, 31 and the locking tool 22 form a connecting position adjusting mechanism of the beam member 2 and the hanging base member 3 for adjusting the total length L1 of the horizontal member 1.

FIG. 3 shows a seating portion 4 in which the seating portion 4 is seated on the haunch surface Fa of the flange portion F. FIG. 3A shows a state in which the seating portion 4 is seated on the haunch surface Fa having an inclination angle θ = 55 °, and FIG. 3B shows a haunch surface having an inclination angle θ = 30 °. The state in which the seating portion 4 is seated on Fa is shown. The inclination angle θ = 55 ° is the maximum inclination angle of the haunch surface to which the horizontal member 1 of this example can be applied, and the inclination angle θ = 30 ° is the minimum inclination angle to which the horizontal member 1 of this example can be applied. Is.

As shown in FIG. 3, the seat portion 4 has a seat metal fitting 40 rotatably supported by the bracket 33 by the support shaft 42. The seat metal fitting 40 has a seating board 45 having a square bottom view (FIG. 4 (B)). The seating board 45 includes a seating surface 41 that sits on the haunch surface Fa. The seating board 45 increases the width of the seating surface 41 to improve the stability when seated. The horizontal member 1 is supported on the haunch surface Fa by the seating surface 41, and the vertical load of the horizontal member 1 is supported by the flange portion F.

A restraining pin 43 is projected from the side surface of the bracket 33. The restraining pin 43 collides with the seat fitting 40 that has rotated to an inclination angle θ = 55 °, and prevents the seat fitting 40 from rotating beyond an angle of 55 °. Therefore, it is possible to reliably prevent the seat fitting 40 from rotating at an angle of more than 55 °.

As described above, the total length L of the horizontal member 1 is set to be smaller by the dimension ΔL × 2 than the span S between the girders, but the dimension ΔL is the dimension ΔL of the pressing portion 5 generated when the pressing portion 5 is tightened. It is also the amount of displacement (extension dimension). Hereinafter, the configuration of the pressing portion 5 will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3A, the pressing portion 5 has a base portion 51 projecting upward from the upper surface of the tubular body portion 30, and a long nut 52 is horizontally fixed to the upper edge of the base portion 51. The screw portion 53 of the adjuster bolt 50 is screwed into the long nut 51, and the head portion 54 of the screw portion 53 protrudes from the long nut 52. The central axis φ2 of the screw portion 53 is parallel to the central axis φ1 of the horizontal member 1 (the central axis of the beam member 20 and the tubular body portion 30), and is above the central axis φ1 of the horizontal member 1 by a distance ε. Is eccentric to. Note that FIG. 3 shows the distance η between the fulcrums of the seating portion 4 and the pressing portion 5.

The adjuster bolt 50 has an enlarged tip portion 55 that is pressed against the web portion E of the girder D, and the enlarged tip portion 55 includes an elastic body such as hard rubber that can come into contact with the side surface Ea of the web portion E. The head portion 54 engages with a tightening tool (not shown) such as an impact wrench or a torque wrench. The adjuster bolt 50 is rotated by the tightening force of the tightening tool and is pressed against the side surface Ea of the web portion E as shown by the arrow γ in FIG. 3A. FIG. 3B shows a state in which the enlarged tip portion 55 of the adjuster bolt 50 is pressed against the side surface Ea.

The horizontal member 1 is erected horizontally in the inter-girder area α by tightening the pressing portions 5 on both sides and pressing each enlarged tip portion 55 against each side surface Ea. Each enlarged tip 55 is constrained or held by each side Ea by the reaction force of the side Ea acting between the enlarged tip 55 and the side Ea and the frictional force between the two. Therefore, the horizontal member 1 tries to maintain its position against the horizontal external force and the exciting force acting on the bridge G and the suspended scaffold A in the event of an earthquake, strong wind, etc., so that the horizontal member 1 is lateral to the flange portion F. Excessive relative displacement of the frame member 1 can be reliably prevented. When removing the horizontal member 1, the head portion 54 may be rotated in the opposite direction to release the tightening force of the adjuster bolt 50.

4 (A) and 4 (B) are a partially broken enlarged front view and an enlarged side view showing the structure of the pressing portion 5 according to a more preferred embodiment.

The pressing portion 5 shown in FIG. 4 has a substrate 56 built in the hollow tip of the tubular portion 30. A circular opening 59 through which the screw portion 53 of the adjuster bolt 50 penetrates is bored in the central portion of the substrate 56, and the long nut 52 is concentrically fixed. The screw portion 53 of the adjuster bolt 50 is screwed into the long nut 52 and projects to the opposite side of the long nut 52 in the pipe inner region of the tubular body portion 30. The central axis φ2 of the screw portion 53 coincides with the central axis φ1 of the horizontal member 1 (the central axis of the beam member 20 and the tubular body portion 30), and the pressing portion 5 and the horizontal member 1 are aligned and received. The distance η between the fulcrums of the seat portion 4 and the pressing portion 5 is shorter than the distance η between the fulcrums of the receiving portion 4 and the pressing portion 5 shown in FIG. The adjuster bolt 50 has a manually operated rotary handle 57 fixed to the screw portion 53 adjacent to the back surface side of the enlarged tip portion 55. The adjuster bolt 50 is pressed against the side surface Ea of the web portion E by manually rotating the handle 57, as shown by the arrow γ.

The position of the enlarged tip 55 is constrained or held by each side Ea by the reaction force and the frictional force acting between the enlarged tip 55 and the side surface Ea, and the horizontal member 1 is the bridge G and the suspension scaffold A. It is possible to prevent an excessive relative displacement of the horizontal member 1 with respect to the flange portion F against the horizontal external force and the exciting force acting on the flange portion F. When removing the horizontal member 1, the handle 57 may be manually rotated in the opposite direction.

By pressing the side surface Ea of the web portion E with the pressing portion 5 in this way to erection the horizontal member 1, the horizontal displacement of the horizontal member 1 is prevented, and the seat portion 4 is reliably supported by the flange portion F. However, in the horizontal member 1 of the present embodiment, in order to further improve the structural stability of the horizontal member 1, the cooperation of the plurality of horizontal members 1 and the rigidity of the entire support structure are improved, or the rigidity of the entire support structure is improved. In order to reduce the number of horizontal members 1, a square opening 34 for mounting a clamp is provided. As shown by the broken line in FIG. 2B, the clamp member 9 can be attached to the portion of the hanging base material 3 having the square opening 34.

5 (A) and 5 (B) are a plan view and a front view showing a state in which the clamp member 9 and the connecting member 10 are attached to the horizontal member 1, and FIG. 5 (C) is a relatively short pipe material. It is a front view of the horizontal member 1 which shows the structure which used as a beam member 20. 5 (D) is a cross-sectional view taken along the line I-I of FIG. 5 (B), and FIG. 5 (E) is an enlarged cross-sectional view of the beam member 2 taken along the line II-II of FIG. 5 (B). .. FIG. 6 is a perspective view of a suspended scaffolding support structure showing a configuration in which horizontal members 1 arranged in parallel are interconnected by a connecting member 10.

The horizontal member 1 shown in FIG. 5 has a pressing portion 5 having the structure shown in FIG. As shown in FIG. 5 (E), the beam member 2 has a reinforcing steel material 23 inserted into the hollow portion of the pipe body 20. The reinforcing steel material 23 has a groove-shaped cross section or a channel-shaped cross section, and a positioning hole 24 aligned with the positioning hole 21 is bored in the web portion of the reinforcing steel material 23. The reinforcing steel material 23 functions as a stiffener or a web for improving the bending rigidity of the beam member 2.

In the left half of FIGS. 5 (A) to 5 (C), a state in which a steel pipe or a metal pipe having a square cross section (square cross section) is used as the connecting member 10 is exemplified, and FIGS. In the right half of C), a state in which a steel pipe or a metal pipe having a circular cross section is used as the connecting member 10 is illustrated. A 60 mm square steel pipe can be exemplified as the connecting member 10 having a square cross section, and a steel pipe having a diameter of about 50 mm can be exemplified as the steel pipe having a circular cross section. However, it goes without saying that pipe materials having the same cross section can be used as the connecting members 10 on the left and right sides. The clamp member 9 is a clamp member for tightening a pipe material that is generally used in a temporary scaffold such as a single pipe scaffold.

In FIG. 6, a plurality of horizontal members 1 oriented in the beam-to-beam direction (Y direction) are erected at intervals in the girder direction (X direction), and the horizontal members 1 are connected to each other by connecting members 10 extending in the girder direction. The support structure of the interconnected suspension scaffold A is shown. In the present embodiment, the suspension scaffold A suspends an SK panel (registered trademark) having a width W3 = about 660 mm from the suspension base material 3 and the connecting member 10 of the horizontal member 1 by the cord C according to the safety SK panel construction method. , SK panels are sequentially connected to each other.

The horizontal member 1 and the connecting member 10 are interconnected by a clamp member 9, and a relatively high-rigidity grid-like support structure in which deformation or fulcrum movement due to horizontal external force, excitation force, etc. is suppressed is generally a haunch portion. It is formed at the level of Fa. Further, in the case of the safety SK panel construction method, the width W3 of the SK panel is about 660 mm, and the rope C needs to suspend the suspension scaffold A at intervals of about 660 mm (W3). 1 also needs to be erected at intervals of about 660 mm. However, according to the support structure of this example in which the cord C is locked or moored by the connecting member 10, the horizontal members 1 may be arranged at intervals of about 1320 mm (W3 × 2). Therefore, the interval between the horizontal members 1 can be increased, and the required number of horizontal members 1 can be halved.

7A and 7B are a plan view, a front view, a side view, and a bottom view showing a configuration of a hanging base material 3 provided with a flange restraint 3 extending below the flange portion F, and FIG. 8 is a horizontal view shown in FIG. It is a partial front view of the horizontal member 1 which shows the usage form of the frame member 1.

The horizontal member 1 shown in FIG. 7 includes a vertical pipe 36 having a square cross section hanging from a pipe body portion 30, a flange restraint 37 movably supported by the vertical pipe 36, and an elevating portion 37a of the flange restraint 37. With a locking tool 39 for locking the vertical pipe 36. A large number of positioning holes 38 aligned in the vertical direction are formed on both side surfaces of the vertical pipe 36, and positioning holes (not shown) that can be aligned with the positioning holes 38 are provided in the elevating pipe portion of the flange restraint 37. It is drilled in 37a. By aligning the positioning holes of the elevating pipe portion 37a with the positioning holes 38 and inserting the shaft portions 39a and 39b of the locking tool 39 into these positioning holes, the height position of the elevating pipe portion 37 can be fixed. ..

A circular opening 35a in which the cord C can be locked or moored is formed in the horizontal extending portion 37b of the flange restraint 37. A circular opening 35b in which the cord C can be locked or moored is formed in the bracket 33a extending inwardly and diagonally upward from the inner surface of the vertical pipe 36. A cord such as a metal wire connected to the locking tools 22 and 39 is moored to the bracket 33b extending outward and diagonally upward from the outer surface of the vertical pipe 36.

As shown in FIG. 8, the flange restraint 37 is positioned at a height position that matches the height V of the flange portion F, and the hanging material 3 is flanged so as to surround the half portion of the flange portion F as a whole. It is installed in part F. The horizontal extending portion 37b extends below the flange portion F, and the circular opening 35a is arranged below the flange portion F.

According to the support structure of the present embodiment, not only the rope C can be moored to the circular opening 35b of the bracket 33a and the suspension scaffold A can be suspended from the upper side of the flange portion F, but also the rope C can be suspended from the circular opening 35b. The suspension scaffold A can be suspended from directly below the flange portion F by mooring at 35a.

9 (A) is a front view showing the configuration of the horizontal member 1 in which the intermediate suspension member 25 is additionally arranged in the central portion of the pipe body 20, and FIG. 9 (B) is FIG. 9 (A). It is a front view which shows the usage form which used the horizontal member 1 shown in) for a bridge of a steel frame structure.

The intermediate suspension member 25 and the tubular body 20 have matching positioning holes (not shown), and the intermediate suspension member 25 has a tubular body 20 by inserting a locking tool 26 into these positioning holes. Is fixed in place. The intermediate suspension member 25 has a circular opening 27 in the hanging portion 25a extending downward from the pipe body 20. According to such a configuration of the horizontal member 1, not only can the cord C be locked or moored in the circular opening 35 and the suspension scaffold A can be suspended from the vicinity of the flange portion F, but also the cord C can be suspended. By locking or mooring the circular opening 27, the suspension scaffold A can be suspended from the central portion of the horizontal member 1.

FIG. 10 is a vertical cross-sectional view of a bridge showing a state in which the suspension scaffold A is suspended from the central portion of the horizontal member 1 by the rope C locked or moored to the intermediate suspension member 25. Since the suspended scaffold A is intermediately supported by the intermediate suspension member 25 arranged at the center of the beam member 2, the stability of the suspended scaffold A can be further improved.

FIG. 9B shows a usage pattern in which the horizontal member 1 shown in FIG. 9A is used for a bridge or the like having a steel frame structure. As shown in FIG. 9B, the horizontal member 1 basically has properties that can be used equally regardless of the difference in the structural type such as the PC structure, the reinforced concrete structure, or the steel frame structure. However, while the flange portion F of the PC girder or the PC beam is provided with the haunch surface Fa, the flange portion F of the girder member or the beam member of the steel frame structure is generally a horizontal plane Fb, so that the flange portion F is slightly biased inward of the span. It is desirable to use the seating portion 4 having the above-mentioned shape.

As described above, according to the support structure and support method of the suspension scaffold A according to the above embodiment, the suspension scaffold A is suspended by the horizontal member 1, and the horizontal member 1 is the flange portion of the adjacent girder D. It is supported by F. The vertical load of the suspended scaffold A is supported by the horizontal member 1 having a two-point support structure with both ends supported by the flange portion F. According to the strength test results (loading test results) of the present inventors regarding the support structure shown in FIG. 6, the additional (applied) load at the time of breaking the horizontal member is a chain load of about 2000 kgf (load per cord). ), Which is about 8000 kgf (about 2000 kgf × 4), and about 3200 kgf (about 800 kgf × 4), which corresponds to the chain load of about 800 kgf (2000 kgf / 2.5), is set as the assumed allowable load of the horizontal member 1. It turned out that it could be done.

Further, in the suspended scaffold A according to the above embodiment, the web portion E of the girder D is pressed by the pressing portion 5, and the reaction force of the web portion E acts on the horizontal member 1 as a compressive force in the axial direction. Holds or restrains the position of the horizontal member 1. Therefore, the horizontal member 1 is unlikely to be displaced relative to the girder D, and the support of the horizontal member 1 is structurally stable. As a result, it is possible to prevent excessive displacement, deformation, rotation, etc. of the horizontal member 1 due to a horizontal load, a horizontal exciting force, an unpredictable short-term load acting on the suspended scaffold A, or the like. Moreover, since the support structure and support method having the above configuration do not require a complicated and heavy three-dimensional frame or three-dimensional frame structure to be arranged in the inter-girder region α, there are points such as weight and workability. Is extremely advantageous.

Further, according to the support structure and support method having the above configuration, a suspension scaffold construction method having a new configuration is realized. 11, 12 and 13 are vertical cross-sectional views and perspective views illustrating a method for constructing a suspended scaffold according to the present invention. 11, 12, and 13 show the process of installing the suspended scaffolding step by step.

As shown in FIG. 12 (A), the panel P constituting the suspended scaffold A is suspended by the rope C. The cord C is moored or locked to the hanging member 3 of the horizontal member 1, and is moored or locked to the connecting member 10. The horizontal member 1 is supported by the girder D by the seating portion 4 and the pressing portion 5 (FIG. 2, etc.) of the hanging material 3, and the connecting member 10 is supported by the girder D via the horizontal member 1. In the case of the suspension scaffold A shown in FIG. 12 (A), the connecting member 10 has a total length corresponding to the distance between the horizontal members 1, and both ends of the connecting member 10 are separated by the clamp member 9. It is tightened to the hanging material 3 of the material 1 respectively. A pair of clamp members 9 are assembled to the central portion of the connecting member 10 in order to regulate the movement of the rope C, and the position of the rope C orbiting the connecting member 10 is held between these clamp members 9. Will be done.

An unconstructed area λ of the scaffold exists on one side (front) of the suspended scaffold A, and a step of extending such the suspended scaffold A to the unconstructed area λ is shown stepwise in FIG. 11 (A) is a cross-sectional view showing a state of an end portion of the suspended scaffold A shown in FIG. 12 (A). As shown in FIGS. 11B and 11C, the operator tightens the clamp member 9a for supporting the connecting member 10a to the hanging member 3 of the horizontal member 1 and attaches a new connecting member 10a. It is arranged in the open portion of the clamp member 9a. In this state, the connecting member 10a may not be tightened by the clamp member 9a, but the connecting member 10a may be slidably supported by the clamp member 9a in the loosely fitted state (released state). The operator further tightens the new clamp member 9b to the tip of the connecting member 10a, and tightens the new horizontal member 1a to the tip of the connecting member 10a by the clamp member 9b. This state is shown in FIGS. 11 (D) and 12 (B).

Next, the operator was supported by the clamp member 9a in the loosely fitted state (released state) as shown by the arrows in FIGS. 11 (E), 11 (F), 12 (B) and 13 (A). Slide the connecting member 10a forward (toward the unconstructed area λ). When the horizontal member 1a is separated from the horizontal member 1 by an appropriate distance, the operator tightens the clamp member 9a and tightens the connecting member 10a to the horizontal member 1. As shown in FIG. 11 (G), in this state, the operator on the frontmost panel P locks or moores the new cord Ca to the connecting member 10a, and suspends the new panel Pa by the cord Ca. Can be hung. After suspending the panel Pa with the cord Ca and connecting it to the panel P, the operator moves on the panel Pa as shown in FIG. 11 (H) and suspends the new cord Cb from the horizontal member 1a. It can be locked or moored to the original material 3a, and a new panel Pb can be suspended by a cord Cb. A state in which the panel Pb is suspended by the cord Cb and connected to the panel Pa is shown in FIG. 13 (B).

The operator can further expand the suspended scaffold A by repeatedly carrying out the steps shown in FIGS. 11 (A) to 11 (H) and FIGS. 12 (A) to 13 (B). Therefore, according to such a method of constructing the suspended scaffold A, the operator on the existing suspended scaffold A relatively easily constructs the suspended scaffold A in the unconstructed area λ in order, and a relatively wide inter-girder area. A suspended scaffold A can be constructed on α.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications or modifications can be made within the scope of the present invention described in the claims. It is possible.

For example, according to the support structure of the present invention, the support rigidity of the horizontal member 1 is relatively stable, so that the panel material, the face material, the scaffolding plate, etc. are placed on the horizontal member 1 as shown in FIG. 1 (C). It is also possible to lay it on the side surface and form a work scaffold A'on the upper side of the horizontal member 1.

Further, the above embodiment has a configuration in which the suspended scaffold of the safety SK panel construction method is attached to the girder of the PC valve T girder bridge, but the present invention describes the type and structure of the suspended scaffold and the type of high-altitude structure. The same applies not only to a cross section or a structure, but also to a support structure and a support method for supporting a suspended scaffold of another type or structure with respect to a high-altitude structure such as another type, cross section or structure. It is possible.

The present invention applies to support structures, support methods and construction methods for suspended scaffolds for forming suspended scaffolds under girders or beams of elevated structures. In particular, the present invention supports the end of the horizontal member by the lower flange of the girder or beam of the elevated structure, and forms the suspension source of the cord by the horizontal member erected in the interspan area of the girder or beam. However, it can be preferably applied to the support structure and the support method of the suspension scaffold in which the suspension scaffold is suspended by the ropes locked or moored to the horizontal member. According to the present invention, excessive displacement, deformation or rotation of the horizontal member supporting the suspended scaffold is surely prevented without arranging a complicated and heavy three-dimensional frame or three-dimensional frame structure in the region between the girders. Its practical value is significant because it can be done and the operator on the suspended scaffold can expand the suspended scaffold relatively easily.

1 Horizontal member 2 Beam member 3 Suspension source material 4 Seating part 5 Pressing part 9 Clamp member 10 Connecting material
20 Pipe 25 Intermediate suspension member 30 Pipe 37 Flange restraint 40 Seating bracket 43 Restraint pin 50 Adjuster bolt A Hanging scaffold C Cable D Girder E Web part Ea Side surface F Flange part Fa Hunch surface Fb Horizontal plane G Bridge S Span between girders α Area between girders λ Unconstructed area

Claims (12)

It has a total length smaller than the separation distance (S) of the side surface or wall surface of the web portion of the girder or beam of the adjacent high-altitude structure, and is seated on the lower flange portion of the girder or beam and supported by the flange portion. It has a seat portion at both ends, by allowed to seating the receiving seat in the upper surface or haunches surface of the flange portion, horizontal member of the two-point support structure that will be bridged span between regions of neighboring digits or beam In the support structure of the suspension scaffold having the upper end portion locked or moored to the suspension portion of the horizontal member and the rope for suspending the suspension scaffold under the girder or the beam.
A connecting member for interconnecting a plurality of horizontal members arranged in parallel at intervals, and a web of the girder or beam attached to both ends of the horizontal member and in the axial direction of the horizontal member. part possess a pressing device you press the,
Without forming a three-dimensional frame or a three-dimensional frame in the interspan region (α) above the horizontal member, the girders or beams of the girder or beam in the axial direction of the horizontal member by the pressing devices at both ends of the horizontal member. The reaction force of the girder or beam that presses the web portion and forms a grid-like support structure for suspending the suspension scaffolding from the horizontal member and the connecting member, and acts in the axial direction of the horizontal member. The position of the cross member is constrained by, and the displacement, deformation or rotation of the cross member due to the external force or exciting force acting on the suspended scaffold and its supporting structure during an earthquake or strong wind is prevented. The support structure of the suspended scaffolding is characterized by this. The horizontal member is an assembly of a pair of hanging members provided with the pressing device, a beam member for interconnecting the hanging members, and a seating portion arranged below the hanging member. support structure according to claim 1, characterized in that it consists of solid. Further having a flange wrapping tool extending downward from the horizontal member so as to partially wrap the side surface and the lower surface of the flange portion, the wrapping tool forms a hanging source of the cord just below the flange portion. The support structure according to claim 1 or 2 , wherein the support structure is provided. The support according to claim 2, wherein the suspension source forming member is additionally arranged in the intermediate region of the beam member, and the suspension source of the cord is further formed in the region between the suspension source materials. Construction. The seat portion is arranged below the suspension base material, and is rotatably supported around the central axis by a support shaft having a central axis parallel to the axial direction of the girder or beam, and exceeds a predetermined angle. The support structure according to claim 2 or 4 , wherein the rotation restraining member for preventing the rotation of the seat portion is arranged on the hanging base material. It has a total length smaller than the separation distance (S) of the side surface or wall surface of the web portion of the girder or beam of the adjacent high-altitude structure, and is seated on the lower flange portion of the girder or beam and supported by the flange portion. A horizontal member having a two-point support structure having bearing portions at both ends is erected in an area between adjacent girders or beams, and the horizontal member extending in a direction orthogonal to the girder or beam is used to suspend the cord. In the method of supporting the suspended scaffold, which is formed and the suspended scaffold is suspended by the cords locked or moored to the horizontal member.
The seating portion is seated on the upper surface or the haunch surface of the flange portion .
With pressing the web portion of the girder or beam in the axial direction of the lateral bridging member by a pressing device attached to both ends of the horizontal members, a plurality of horizontal member between which are arranged in parallel spaced Are interconnected by a connecting material to form a grid-like support structure for suspending the suspension scaffolding by the horizontal member and the connecting material .
The position of the horizontal member is constrained by the reaction force of the web portion acting in the axial direction of the horizontal member without forming a three-dimensional frame or a three-dimensional frame in the interspan region (α) above the horizontal member. A method for supporting a suspended scaffold, which prevents displacement, deformation, or rotation of the horizontal member due to an external force or a vibrating force acting on the suspended scaffold and its supporting structure during an earthquake or a strong wind. A pair of Tsumoto material provided with the pressing device, and the beam member interconnecting the hanging source material, as an assembly for assembling the said seat portion which is disposed below the Tsumoto member, said horizontal member The support method according to claim 6, wherein the applicable range of the horizontal member is changed with respect to the span dimension of the girder or the beam by exchanging the beam member. A claim characterized in that a hanging source of the cord is further formed directly below the flange portion by a flange surrounding tool extending downward from the horizontal member so as to partially surround the side surface and the lower surface of the flange portion. Item 6. The support method according to Item 6. The support according to claim 7 , wherein a hanging base forming member is additionally arranged in an intermediate region of the beam member, and a hanging base of the cord is further formed in a region between the hanging base materials. Method. It said seat portion is disposed below the Tsumoto material, supporting the digit or the seat unit so as to be rotatable about the central axis line by a shaft having an axis parallel to the direction center axis of the beam, The support method according to claim 7 or 9 , wherein the rotation restraining member provided on the suspension base material prevents the seat portion from rotating beyond a predetermined angle. The end of the horizontal member is supported by the lower flange of the girder or beam of the elevated structure, the horizontal member is erected in the span-span area of the adjacent girder or beam, and the direction orthogonal to the girder or beam. In a method of constructing a hanging scaffold in which a hanging base of a rope is formed by the horizontal member extending to the horizontal member and the hanging scaffold is suspended by a rope locked or moored to the horizontal member.
A connecting member for interconnecting a plurality of horizontal members arranged in parallel is slidably supported on the existing horizontal member, and a second horizontal member is fastened to the tip of the connecting member, and the connecting member is attached. The second horizontal member is positioned by sliding it toward the unconstructed area of the suspended scaffold, and the connecting member is tightened to the existing horizontal member.
A method for constructing a suspended scaffold, characterized in that a new rope is locked or moored to a second horizontal member, and the scaffold plate or scaffold panel of the suspended scaffold is suspended from the unconstructed area by the rope. A new cord is locked or moored to the connecting member, the scaffolding plate or scaffold panel of the suspended scaffold is suspended from the unconstructed area by the cord, and then the cord is locked to the second horizontal member. The construction method according to claim 11 , wherein the process of mooring is carried out.

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