JP2013072278A - Pipe bend structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe bend structure which enables assembling and disassembling work on a bridge erection site to be performed in a short construction period by enabling assembly to be performed in a factory and enabling an assembled member to be transported by a truck.SOLUTION: A safety fence 51 is ascendably/descendably held by predetermined horizontal joint frames 41-44. The safety fence 51 is carried into an erection site together with the horizontal joint frames 41-44. A pipe bend is assembled by coupling the horizontal joint frames 41-44 together. Thus, the safety fence 51 is located in a predetermined position. When the safety fence 51 is lifted to make an upper horizontal fence 51b fixed to corresponding gussets 42e and 44e, the safety fence 51 is brought into the state of being installed in the predetermined position.

Description

  The present invention relates to a venting facility for temporarily receiving and supporting members such as bridge girders and floor slabs when laying a bridge, and relates to a pipe vent structure using a tubular pipe as a support material, and particularly simplification of assembly. The present invention relates to a pipe vent structure.

  As a method of erection of bridges, members such as girders and floor slabs are divided into blocks of a size that can be transported on land, and then transported to the construction site, and the divided blocks are installed on vent facilities. There is a truck crane vent method by disassembling and removing the vent equipment after connecting all the blocks. The venting facility is installed in a rectangular shape with the required number of columns on the floor girder, connected to each other with horizontal connecting materials, and hung on the upper and lower parts of the adjacent columns to bridge the brace in the diagonal direction. Configured. A pillow girder is placed on the upper end of the column, and this pillow girder temporarily receives a girder, a floor slab block, or the like.

Conventionally, as a support member of this type of vent equipment, there is a case in which a 500 square vent having excellent characteristics such as high structural flexibility and high load bearing capacity is used. But,
(1) The transportation cost is high due to the large mass.
(2) The number of parts is large, and it takes time to prepare for shipping, loading, unloading, and maintenance, and a large yard is required for storage.
(3) When there are many types of parts and they are mixed due to the difference in shape, stability during transportation is lacking.
(4) There are many parts and time is required for assembly and disassembly.
(5) 6m size is the principle, and work at high places will increase when assembled with face materials.
(6) While it can handle any structure, the specifications differ from site to site and special considerations are required for safety.
Etc. Cons.

  For example, the invention disclosed in Patent Document 1 relates to a configuration in which a staircase member is attached to the outside of a frame support composed of a column, a horizontal connecting material, and a brace. A structure that is assembled by stacking a plurality of unitized frame-shaped frame members composed of strut members, horizontal connecting members, and braces, and fixing the strut members of the upper and lower frame members with bolts and connecting them. It is disclosed.

  However, in the vent facility disclosed in Patent Document 1, a structure in which a brace is arranged in an X shape between adjacent support members is employed, and the frame member is large in size and has a size of 6 m. It has become a thing. For this reason, it will receive restrictions in the case of transportation, will carry in in the state which divided each member, and will assemble to a frame member at a temporary construction site. Therefore, the number of parts increases at the time of transportation, and there is a possibility that stability is lost due to being mixed. Moreover, time is required for assembly, and time is also required for disassembly at the time of removal.

  In addition, since stair members for raising and lowering workers are attached to the outside of the frame support work, a member that supports the stair members is required separately from the vent equipment, and the number of parts is increased, resulting in transportation and assembly. In this case, it takes time for disassembly.

  For this reason, the applicant of the present application can reduce the number of parts and reduce the number of parts, and by making the unit members compact, it is possible to increase the efficiency of loading, loading and unloading when transporting by truck, and to ensure stability during transportation A structure was proposed (see Patent Document 2).

  On the other hand, the pipe vent incorporates stairs for raising and lowering workers and scaffolds for work, etc. The scaffold plates and stairs for this kind of scaffold are assembled on the ground separately from the vent structure, for example. Incorporated into a predetermined position by a crane or the like (see Patent Document 3).

JP 2005-248628 A Japanese Patent Application No. 2010-075755 JP-A-7-243205

  If the scaffolding plate or the like is assembled on the ground after being assembled on the ground, the portability of the pipe vent proposed by the applicant of the present application will be hindered. In addition, since the scaffolding plate and the like must be carried separately from the vent structure, it becomes an obstacle to downsizing during transportation.

  Therefore, the present invention can ensure good portability and simplify transportation, and can facilitate simplification of on-site assembly work, thereby shortening the construction period and reducing costs. It aims to provide a pipe vent structure.

As a technical means for achieving the above object, the pipe vent structure according to the present invention is a vent facility for temporarily receiving a member to be installed in the construction work of a bridge or the like, and uses a steel pipe as a support material. In the pipe vent structure in which a plurality of support members are connected by a transverse frame, the transverse frame is constituted by an upper and lower horizontal member and an oblique member spanned between the upper and lower transverse frames. A hooking means for supporting the safety fence so that it can be moved up and down and fixing the upper end of the safety fence when it is raised is provided in the gusset arranged above the horizontal joint frame, and the safety fence is provided on the horizontal frame. of the transportation crowned located at a position lowered, it is characterized in that is fastened more upper portion to the latching means is raised at the time of assembly of the vent.

  In other words, a safety fence is supported in advance on the horizontal joint frame for assembling the pipe vent so that it can be raised and lowered, and when the horizontal frame is transported, it is placed in a lowered position and overlapped with the horizontal frame with the horizontal frame. Transported. A safety fence for work can be obtained by raising the safety fence while connecting the horizontal connecting frames at the site and fixing the upper end to the hooking means.

In addition, according to the pipe vent structure according to the second aspect of the present invention, the safety fence is transported along with the transportation of the horizontal connection frame and is carried into the site. And since this safety fence is located in a predetermined installation place by assembling the horizontal connection frame, the carrying-in work can be simplified. When the safety fence positioned at a predetermined position is raised and the upper end portion is fixed to the hooking means, the safety fence is installed, and the assembly work can be simplified.

  In addition, the external dimensions of the members will be standardized, and the members can be stored using a dedicated storage frame. Further, safety during transportation and efficiency of taking out the members can be achieved. Moreover, since it can be stored in the storage frame, the storage space in the storage yard can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the safety fence with which the pipe vent structure which concerns on this invention was equipped, and the state which the safety fence lowered | hung is shown with the horizontal frame along with the imaginary line. The state which raised the safety fence shown in FIG. 1 is shown. It is a top view which shows the state which installed the scaffold board with which the pipe vent structure concerning this invention was equipped in the predetermined position. It is a top view of the scaffold board shown in FIG. It is a figure which shows the hinge part which supports a scaffold board so that rocking | fluctuation is possible, (a) is a front view, (b) is a top view. It is a figure which shows the support plate which engages the front-end | tip part of a scaffold board. It is a front view of the vent equipment provided with the pipe vent structure concerning this invention. It is a left view of the vent equipment shown in FIG. FIG. 3 is a front view of a transverse frame belonging to a first type applied to the pipe vent structure according to the present invention. FIG. 3 is a front view of a transverse frame belonging to a first type applied to the pipe vent structure according to the present invention. It is a front view of the transverse frame which belongs to the 2nd type applied to the pipe vent structure concerning this invention. FIG. 3 is a front view of a transverse frame belonging to a first type applied to the pipe vent structure according to the present invention. It is a front view of the support | pillar member which comprises a support | pillar, and has shown four types of support | pillar members. It is a cross-sectional view of the support | pillar member in FIG. 13, (a), (b) has each shown the AA sectional view taken on the line in FIG. 13, and the BB sectional drawing.

  Hereinafter, the pipe vent structure according to the present invention will be described in detail based on the illustrated preferred embodiments.

  FIG. 7 is a front view of a vent facility 1 having a pipe vent structure according to the present invention, and FIG. 8 is a left side view. This vent facility 1 has a structure in which six columns and two columns of columns 3 are erected on a floor girder 2 and a transverse frame 4 is spanned between these columns 3. The six pillars 3 in front view are two working pillars 3 with work stairs 5 on which the worker who assembles the vent facility 1 ascends / descends is arranged at almost equal intervals to be working parts. Three sets of working parts are arranged at almost equal intervals. A pillow girder 6 is placed on the upper end of the column 3, and a floor slab 8 is installed on the pillow girder 6 via a main girder 7.

In this vent facility 1, as shown in FIGS. 7 and 8, the horizontal connection frame 4 is configured by combining four types of horizontal connection frames 41 to 44. Then, the dimension L ₁ between the posts 3 of the working unit tower adjacent to the three sets of the working unit tower of the front view of FIG. 7, equal to the dimension L ₂ between two posts 3 in the side view of FIG. 8 And configure.

  FIG. 9 is a front view of the transverse frame 41 belonging to the first type, and is formed by upper and lower horizontal members 41a and 41b and a pair of diagonal members 41c. The pair of diagonal members 41c is provided so as to span a gusset 41d at the center portion of the upper horizontal member 41a and a gusset 41f at each end portion of the lower horizontal member 41b, and is formed in a tilting manner. Further, gussets 41e are attached to both ends of the upper horizontal member 41a, and are connected to post members described later via the gussets 41e and the gussets 41f. In these gussets 41e and 41f, a plurality of bolt holes 41g through which bolts to be connected to the support columns 3 are inserted are formed at a constant pitch. The horizontal members 41a and 41b are made of, for example, 100 × 100 mm equilateral angle steel, and the diagonal members 41c are made of, for example, 75 × 75 mm equilateral angle steel. As shown in FIG. 7, the width of the horizontal frame 41 is such that the width direction spans between the columns 3 of the working section rod, and the horizontal direction of the bolt holes 41g of the gussets 41e and 41f attached to the end portions. The direction dimension is 1720mm. The height is 600 mm between the centers of the horizontal members 41a and 41b.

  FIG. 10 is a front view of the transverse frame 42 belonging to the first type, and is formed by upper and lower horizontal members 42a and 42b and a pair of diagonal members 42c. The pair of diagonal members 42c is provided so as to span the gussets 42d at the center of the upper horizontal member 42a and the gussets 42f at the respective ends of the lower horizontal member 42b, and is formed in a tilting manner. Further, gussets 42e are attached to both ends of the upper horizontal member 42a, and are connected to support members described later via the gussets 42e and the gussets 42f. In these gussets 42e and 42f, a plurality of bolt holes 42g through which bolts to be connected to the support column 3 are inserted are formed at a constant pitch. The horizontal members 42a and 42b are made of, for example, 100 × 100 mm equilateral angle steel, and the diagonal members 42c are made of, for example, 75 × 75 mm equilateral angle steel. As shown in FIG. 7, the transverse frame 42 is dimensioned so that the width direction spans between a pair of support columns 3 in the same manner as the transverse frame 41, and the gussets 42 e and 42 f attached to the end portions. The horizontal dimension of the bolt hole 42g is 1720 mm. The height is 1725 mm between the centers of the horizontal members 42a and 42b. A stepping plate support member 42h is attached to the horizontal connecting frame 42 at an intermediate portion in the vertical direction.

  FIG. 11 is a front view of the transverse frame 43 belonging to the second type, and is formed by upper and lower horizontal members 43a and 43b and two pairs of diagonal members 43c. The two pairs of diagonal members 43c are alternately arranged between the gusset 43d on both sides of the position where the upper horizontal member 43a is substantially divided into four parts, the gusset 43f on the center of the lower horizontal member 43b, and the gussets 43g on both ends. It is installed across the bridge and formed in an anti-tilt system. Further, gussets 43e are attached to both ends of the upper horizontal member 43a, and are connected to support members described later via the gussets 43e and the gussets 43g. In these gussets 43e and 43g, a plurality of bolt holes 43h through which bolts to be connected to the support column 3 are inserted are formed at a constant pitch. The horizontal members 43a and 43b are made of, for example, 100 × 100 mm equilateral angle steel, and the diagonal members 43c are made of, for example, 75 × 75 mm equilateral angle steel. As shown in FIG. 7, the transverse frame 43 is dimensioned to be spanned between adjacent struts 3 of the adjacent sets in the width direction, and the bolt holes 43h of the gussets 43e and 43g attached to the ends. The horizontal dimension is 2720mm. The height is 600 mm between the centers of the horizontal members 43a and 43b.

  FIG. 12 is a front view of the transverse frame 44 belonging to the first type, and is formed by upper and lower horizontal members 44a and 44b and a pair of diagonal members 44c. The pair of diagonal members 44c are provided so as to span the gussets 44d at the center of the upper horizontal member 44a and the gussets 44f at the respective ends of the lower horizontal member 44b, and are formed in a tilting manner. Further, gussets 44e are attached to both end portions of the upper horizontal member 44a, and are connected to support members described later via the gussets 44e and the gussets 44f. In these gussets 44e and 44f, a plurality of bolt holes 44g through which bolts to be connected to the support column 3 are inserted are formed at a constant pitch. The horizontal members 44a and 44b are made of, for example, 100 × 100 mm equilateral angle steel, and the oblique members 44c are made of, for example, 75 × 75 mm equilateral angle steel. As shown in FIG. 7, the transverse frame 44 is sized so as to be spanned between the adjacent struts 3 of the adjacent sets in the width direction, like the transverse frame 43, and is attached to the end portion. The horizontal dimension of the bolt holes 43g of 44e and 44f is 2720 mm. The height is 1725 mm between the centers of the horizontal members 44a and 44b. A step board support member 44h is attached to the horizontal joint frame 44 at an intermediate portion in the vertical direction.

  FIG. 13 shows column members 31 to 34 constituting the column 3, FIG. 14 is a cross-sectional view of the column member, and FIGS. 14 (a) and 14 (b) are respectively A in FIG. 13 (a). It is sectional drawing cut | disconnected along the -A line and the BB line. FIG. 13A shows a long column member 31, FIG. 13B shows a first medium column member 32, FIG. 13C shows a second medium column member 33, and FIG. 13D shows a short column member 34. Each of them has a cross-sectional shape shown in FIG. Each of the support members 31 to 34 is mainly composed of a tubular pipe material, and a steel pipe of φ139.8 × 6.6 mm by STK490 is used.

  As shown in FIGS. 13A and 13B, the upper and lower ends of the long column member 31 and the first medium column member 32 are formed with bolt holes 36a shown in FIG. 14A. A flange 36 is attached. A pair of gussets 37 are respectively attached to the intermediate portions of the support members 31 and 32. A gusset 38 is also attached to a portion adjacent to the joint flange 36. Bolt holes 37a are formed in the pair of gussets 37 attached to the long column members 31 at positions that match the bolt holes 41g, 42g, 43h, 44g. The pair of gussets 37 connect the gussets 42e, 42f, 44e, 44f at the ends of the upper and lower horizontal members 42a, 42b, 44a, 44b of the horizontal connecting frame 42 and the horizontal connecting frame 44, respectively. It is provided at a position where Also, the pair of gussets 37 attached to the first medium strut member 32 can be connected to the respective gussets 41e, 41f, 43e, 43g of the transverse frame 41 and the transverse frame 43. Is provided.

  Further, the second medium-sized column member 33 shown in FIG. 13 (c) has joint flanges 36 attached to both ends, and the lateral joint frame 41 and the lateral joint frame 43 are disposed at portions adjacent to the joint flange 36. A gusset 37 that can connect the respective gussets 41e, 41f, 43e, and 43g is attached.

  A short support member 34 shown in FIG. 13 (d) has joint flanges 36 attached to both ends, and a gusset 39 is attached between the joint flanges 36. The gusset 39 is formed with bolt holes 39a at positions corresponding to the bolt holes 41g, 42g, 43h, 44g and more than the bolt holes 41g, 42g, 43h, 44g. It is formed with a pitch equal to the pitch of the holes 41g, 42g, 43h, 44g. Therefore, the gusset 39 can be connected to any of the gussets 41e, 41f, 42e, 42f, 43e, 43g, 44e, 44f of the transverse frames 41, 42, 43, 44, and the gusset Even if the gussets 41e, 41f, 42e, 42f, 43e, 43g, 44e, and 44f are shifted in the vertical direction with respect to 39, any one of the bolt holes 39a and the bolt holes 41g, 42g, 43h, and 44g should match. Can be connected with each other.

  Further, as shown in FIGS. 7 and 8, in this vent facility 1, a crossover material 46 is bridged between the pillars 3 of the work section as a horizontal connecting material for connecting the upper ends of the pillars 3 in a front view. Then, the crossing material 47 is bridged between the columns 3 positioned between the adjacent working members in front view and between the columns 3 in side view. In addition, a safety fence 51 is disposed in a portion of the working unit ridge that does not have a transverse frame. Further, a tread board serving as a scaffold for workers who assemble the vent facility 1 is bridged using the tread board support members 42h and 44h.

FIG. 3 is a plan view showing the scaffold plate 61 and the steps 5. The scaffold plate 61 is swingably supported on the lower horizontal member 42b of the horizontal joint frame 42 via a hinge 61a. By this swing, at least the vertical position along the horizontal joint frame 42 and the horizontal position thereof are supported. It swings between horizontal positions orthogonal to the joint frame 42. In a state where the scaffold plate 61 is located at the horizontal position, the distal end portion of the scaffold plate 61 faces the upper end portion and the lower end portion of the staircase 5. At this time, the support plate 62 is spanned at a position where the tip portion is located and faces the lower side of the tip portion, the tip portion is placed on the support plate 62, and the scaffold plate 61 is stepped. It is distributed over 5 landings.

FIG. 4 is a plan view of the scaffold plate 61, which is formed in a lattice shape or a mesh shape such as grating. Three hinges 61a are disposed at one end of the scaffold plate 61, and as shown in FIG. 5 , a pair of support protrusions 61b are provided, and one support protrusion (between the support protrusions 61b ( (Not shown) is attached to the horizontal members 42a and 42b, and the support protrusion (not shown) is inserted into the support protrusion 61b by positioning the support protrusion between the support protrusions 61b. The scaffold plate 61 is supported by the transverse frame 42 so as to be swingable. FIG. 6 is a plan view of the support plate 62. At both ends, there are fixing plates 62a for fixing the horizontal members 44a and 44b to the horizontal members 44a and 44b. Is provided.

FIGS. 1 and 2 are views showing the safety fence 51, which shows the safety fence 51 provided on the horizontal connection frame 42. In addition, the safety fence 51 is also provided in the transverse frame 44, and those for the transverse frame 42 and those for the transverse frame 44 are sized according to the dimensions of these transverse frames 42, 44, etc. Are different and are structurally equivalent. FIG. 1 shows the state of the safety fence 51 when the horizontal connection frame 42 is conveyed by a vehicle or the like, and FIG. 2 shows the state when the pipe vent is constructed. In this safety fence 51, a pair of vertical fences 51a are held up and down by U-bolts 52 on each of the upper gussets 42e of the transverse frame 42, and FIG. 1 shows a state where it is lowered to the lowest position. The upper horizontal fence 51b is fixed over the upper ends of the pair of vertical fences 51a, and the intermediate horizontal fence 51c is extended over the middle part. The intermediate horizontal fence 51c is slidable in the longitudinal direction of the vertical fence 51a with respect to the vertical fence 51a, and is a through hole (not shown) that matches a through hole 53a formed in the center of the vertical fence 51a. The vertical fence 51a and the intermediate horizontal fence 51c are fixed by inserting a fixing bolt (not shown) through these through holes 53a and the through holes formed in the intermediate horizontal fence 51c and tightening the nuts. It is like that. In FIG. 1 , the intermediate horizontal fence 51c is not fixed to the vertical fence 51a.

At both ends of the upper horizontal fence 51b, fixing through holes 53b constituting a latching means are formed, and when the vertical fence 51a is raised, the fixing through holes 53b are formed in the vertical fence 51a. And the fixing through holes 53c constituting the latching means formed on the gusset 42e located above the gusset 42e connected to the U bolt 52 via the U bolt 52, and these fixing through holes 53b, 53c By inserting a fixing bolt that constitutes a latching means and tightening a nut, the upper horizontal frame 51b is stretched over and fixed to the gusset 42e, and the safety fence 51 is fixed.

In order to assemble the vent equipment 1 configured as described above, all of the horizontal connecting frames 41 to 44 are assembled in advance at the factory, and these are transported by truck. In this case, since the transverse frames 41 to 44 are approximately the following dimensions (horizontal direction x height)
Transverse frame 41 1720mm × 600mm
Transverse frame 42 1720mm × 1725mm
Transverse frame 43 2720mm × 600mm
Transverse frame 44 2720mm × 1725mm
The horizontal connection frame 44 is the largest one, and any of them can be loaded on a truck and transported. Further, these horizontal connecting frames 41 to 44 and the supporting column members 31 to 34 required to connect the required horizontal connecting frames 41 to 44 are transported to a construction site in a combination capable of assembling a required height. Further, both the safety fence 51 and the scaffolding plate 61 are transported together with the transverse frames 42 and 44 and carried into the erection site.

  At the construction site, the supporting members 31 to 34 corresponding to the connecting frames 41 to 44 are replaced with the gussets 41e, 41f, 42e, 42f, 43f, 43g, 44e, 44f of the connecting members 41 to 44 and the supporting members 31 to 34. 37 is fixed by bolts and nuts through the respective bolt holes 41g, 42g, 43f, 44g and the bolt holes 37a. The support members 31 to 34 are piled together by fixing the joint flanges 36 with bolts and nuts through bolt holes 36a so that the vent facility 1 has a desired height. Further, the transverse joint frames 41 to 44 are combined with the support members 31 to 34 interposed therebetween so that the vent facility 1 has a desired length and width.

The vent facility 1 shown in FIGS. 7 and 8 has a width of 3000 mm, a length of 12000 mm, and a height of 18750 mm. In other words, the distance L ₁ and the width L ₂ between the adjacent working parts are set to 3000 mm, the width L ₃ of the working parts is set to 2000 mm, and the length is set to 12000 mm. In this vent facility 1, six long strut members 31 are arranged in four rows in two rows, a first medium strut member 32 is arranged in two rows on the top, and a first step on the top. 2 A medium-sized column member 33 is arranged, and a single short column member 34 is arranged on the upper part thereof. The transverse frames 42 are stacked in four steps in order from the bottom on the two struts 3 of the set that constitutes the working unit with the staircase 5 of the vent facility 1 disposed inside. In addition, a transverse frame 44 is incorporated in a portion between these working members by way of a gusset 37 of a long column member 31 that is vertically stacked. That is, as shown in FIG. 7, the horizontal joint frame 42 and the horizontal joint frame 44 are alternately assembled in the vertical direction with the horizontal position shifted. For this reason, the distance between the gussets 37 attached to the long column member 31 and the length positioned above the gusset 37 above the long column member 31 in the state where the long column members 31 are stacked. The distance from the lower gusset 37 of the length support member 31 is made equal. Note that the tread plate support material 44h is not provided in the transverse frame 44 arranged in the length direction. Further, as shown in FIG. 8, the transverse frame 44 is stacked in four stages in the width direction.

  The transverse joint frame 41 is connected to a first intermediate pillar member 32 in two stages stacked on the upper part of the long pillar member 31 supporting the transverse frame 42, and the first intermediate pillar member 32. A horizontal joint frame 41 is connected to the second medium-sized column member 33 stacked in a single stage. A transverse member 46 is incorporated in the short column member 34 stacked on the second medium column member 33.

  The uppermost gusset 44e of the horizontal joint frame 44 is incorporated by being connected to the lower gusset 37 of the first medium strut member 32. For this reason, the distance between the gussets 37 attached to the long column member 31 and the state that the first medium column member 32 is stacked on the long column member 31 and the upper gusset 37 of the long column member 31 The distance from the lower gusset 37 of the 1 medium strut member 32 is made equal. Above the horizontal connecting frame 44, the horizontal connecting frame 43 is connected to the first medium strut members 32 stacked in two stages. Further, on the transverse frame 43, a transverse member 47 is bridged over the short column member 34.

  Further, in the width direction, as shown in FIG. 8, the first medium strut member 32 stacked in two steps and the first second medium strut member 33 stacked thereon have a transverse frame. 43 is incorporated. Further, a transverse member 47 is bridged over the short column member 34 stacked on the second medium column member 33.

  Then, a pillow girder 6 is bridged on the uppermost short column member 34, a main girder 7 is stacked on the pillow girder 6, and a floor slab 8 is installed on the main girder 7.

  When constructing a pipe vent by assembling the transversal frames 41-44 and the columns 31-34 etc. carried into the construction site, while assembling the scaffolding plates 61 supported by the transversal frame 42 located at the lower level sequentially Do. In order to assemble the scaffold plate 61, the support plate 62 is hung on the lower horizontal member 44b of the transverse frame 44. The support plate 62 is carried in by an operator, but a weight that can be carried in manually is sufficient. When the scaffold plate 61 is swung around the hinge 61a and the tip of the scaffold plate 61 is placed on the support plate 62 spanned over the transverse frame 44, the scaffold plate 61 is installed. It becomes. That is, the scaffold board 61 can be installed at a predetermined position without using a cargo handling device such as a crane.

  In addition, the safety fence 51, when the transverse frames 42, 44 are assembled, raises the vertical fence 51a with respect to the U-bolt 52 to fix the both ends of the upper horizontal fence 51b. The holes 53b are aligned with the fixing through holes 53c of the gussets 42e and 44e, and fixed with fixing bolts. Further, a through hole (not shown) of the intermediate horizontal fence 51c is matched with the through hole 53a of the vertical fence 51a and fixed with a fixing bolt. Thereby, the safety fence 51 can be installed at a predetermined position.

  According to the pipe vent structure according to the present invention, the joint frame assembled in advance in the factory can be transported to the bridge construction site by a truck, so that the construction period of the vent equipment is shortened by so-called prefabrication. It is possible to simplify the loading of these members by shortening the construction period and shortening the construction period by holding the scaffolding plate and safety fence incorporated in the pipe vent in advance in the transverse frame. Contribute to.

1 Vent equipment 2 Girder 3 Prop
41-44 Transverse frame
41a Upper horizontal material
41b Lower horizontal material
41c diagonal
42a Upper horizontal material
42b Lower horizontal material
42c diagonal
43a Upper horizontal material
43b Lower horizontal material
43c diagonal
44a Upper horizontal material
44b Lower horizontal material
44c diagonal
46 Joint material
47 Transit material 5 Stairs 6 Pillow girder 7 Main girder 8 Floor slab
51 Safety fence
51a Vertical fence
51b Upper horizontal fence
51c Intermediate horizontal fence
52 U bolt
53a Through hole
53b fixing hole
61 Scaffolding board
61a hinge
62 Support plate
62a fixed plate

Claims (1)

In the pipe vent structure in which a steel pipe is used as a support material and a plurality of support members are connected by a transverse frame in the venting facility for temporarily receiving a member to be installed at the time of construction work such as a bridge.
The transverse frame is composed of upper and lower horizontal members and diagonal members spanned between the upper and lower transverse frames,
A safety means is supported on the transverse frame so that the safety fence can be raised and lowered, and a hooking means for fastening the upper end of the safety fence at the time of ascent is provided in the gusset arranged above the transverse frame,
It said safety fence, pipe vent structure characterized in that said at horizontal joint frame transport crowned located at a position lowered, during assembly of the vent is fastened more upper portion to the latching means is raised.

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