JP2013209865A - Extensible bent and extensible timbering - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extensible bent with which assembly of a timbering is facilitated and of which the height is adjusted easily, and an extensible timbering combining two or more extensible bents.SOLUTION: An extensible bent which is extended in a vertical direction (perpendicular direction) and of which the height is adjustable comprises a lower bent and an upper bent which are combined to be moved up and down, and a drive mechanism which moves up and down the upper bent. In the lower bent, two or more posts (lower posts) which are disposed while being confronted at an interval are connected in at least longitudinally upper end side and lower end side two or more positions by a connecting material while maintaining the interval. In the upper bent, two or more posts (upper posts) which are disposed while being confronted at an interval are connected in longitudinal one or two or more positions by a connecting material. The lower post and the upper post are combined vertically to be moved up and down, and the driving mechanism moves up and down the upper bent to extend lengths of both the upper and lower bents (to adjust heights).

Description

  The present invention relates to a telescopic vent and a telescopic support that assembles the vent.

  There are various methods for constructing bridges. As one of them, there is a vent method that uses a support structure assembled by stacking vents when a bridge girder is installed between piers. The vent method is a method of assembling a gantry (support work) that supports steel beams by stacking and connecting steel vents upward, and erection the bridge beam on the support work.

  The stacked upper and lower vents need to be connected (rigidly connected) to each other, and the connected vents need to be disassembled and removed after the bridge girder is installed on the pier. Conventionally, a small crane was used to disassemble the vent and the hook of the crane was hung on the vent, but since the vent is under the bridge girder and the height cannot be adjusted, there is a gap to hook the hook. There was no hook. Therefore, in order to disassemble the bridge by hooking the vent with a gap between the bridge girder and the vent, prior to that, unsafe work such as laterally pulling the sanddle material or beam material on the upper part of the support work has been performed. It was.

  There are various types of vents used in the vent method, and one of them is a telescopic vent (Patent Document 1) that can be expanded and contracted. In this telescope type vent, a small inner steel pipe is slidably inserted into a large outer steel pipe, the inner steel pipe is projected into a predetermined position, and then the height adjustment pin is set in the height direction of the inner and outer steel pipes. By selecting and inserting pin holes that are opened at a predetermined interval, the inner steel pipe is fixed and the protruding length can be adjusted.

  As another example of the vent, one that can open and close four columns in a square in plan view is known (Patent Documents 2 and 3).

Japanese Patent Laid-Open No. 10-252285 JP 2012-1997 Japanese Patent No. 3700500

  Since the telescope type vent described in Patent Document 1 has a single column shape, a large number of vents are required for assembling the support work, and a jack mounting base, an upper receiving base, a jack, etc. must be set for assembly. Therefore, there is a problem that the work is troublesome and time-consuming. In addition, as described in paragraph 0008, there is a problem that a lifting device such as a truck or a crane has to be used for the extending operation of the vent itself, and the extending work becomes large.

  The foldable vents described in Patent Documents 2 and 3 have a folding structure, and are convenient for loading and transporting to a transport vehicle, but they are inconvenient in that they cannot be adjusted in height.

  The object of the present invention is that it does not require a large space for storage, it can be easily loaded into a transport vehicle or transported to the site, easy to assemble a support work, and does not require a truck or crane for expansion and contraction. An object of the present invention is to provide a telescopic vent that can be adjusted (expanded) and that can easily be removed after the bridge girder is installed, and a telescopic vent unit (expandable support) that combines a plurality of telescopic vents.

[Expandable vent]
The telescopic vent of the present invention is an telescopic vent that can be adjusted in height by extending and contracting in the vertical direction (vertical direction), and is configured to move up and down the lower vent and the upper vent that are combined to be movable up and down. The lower vent has a drive mechanism, and at least two places on the upper end side and the lower end side in the vertical direction of two or more struts (lower struts) opposed to each other with a space therebetween are held by a connecting material. Connected, the upper vent is connected to one or more vertical positions of two or more struts (upper struts) facing each other with a gap, and the lower strut and upper strut can be moved up and down In combination, the drive mechanism is configured such that the length of both the upper and lower vents can be expanded and contracted (height can be adjusted) by raising and lowering the upper vent.

  The drive mechanism can be installed in the lower vent or the upper vent, can be driven by a drive source provided in the lower vent or the upper vent, and the upper vent can be moved up and down along the lower vent by the drive.

  An installation portion for installing the drive mechanism and the drive source may be provided in the upper vent or the lower vent.

  A lower cover may be provided in the lower vent, and an upper cover may be provided in the upper vent in a vertical direction, and the drive mechanism may be accommodated in the upper cover or the lower cover.

  A drive mechanism may be provided in the upper cover so that the drive mechanism moves up and down as the upper vent moves up and down, and the upper cover and the drive mechanism are accommodated in the lower cover when the upper vent is lowered. it can.

  The lower vent column and the upper vent column are made of a long, hollow material that can accommodate the other column so that the other column can be raised and lowered. When the upper vent is lowered, the column is placed in the lower vent column. It can also be contained or covered outside.

  A trap can be provided vertically on the lower vent.

  A scaffold may be provided between the lower vent columns. The scaffold may be a foldable type or a fixed type that cannot be folded.

  The lower vent and the upper vent are provided with a locking mechanism. The locking mechanism can lock the upper vent that moves up and down at a predetermined position of the lower vent, and the upper vent can move up and down along the lower vent by releasing the locking. It can also be done.

  The locking mechanism can insert / remove the stop pin into the lower insertion hole opened in the lower vent column and the upper insertion hole opened in the upper vent column. It can be positioned by being locked to the lower vent column, and the upper vent column can be lowered along the lower vent column by removing the stop pin.

  In the telescopic vent, a pin that supports the stop pin when the stop pin is inserted under the insertion hole of the support column on the inner side among the support column of the lower vent and the support column of the upper vent, one of which is inserted into the other A backing material can be installed. This pin receiving material can be provided in a half pipe shape or a substantially half pipe shape, with its opening facing upward.

  In the telescopic vent, the drive mechanism is a rack and pinion, a ball spline, a chain block, a hydraulic cylinder, an air cylinder, etc., and the upper vent can be moved up and down along the lower vent by forward / reverse operation of the drive mechanism. Can do.

  Two or more rods may be arranged vertically between the lower vent column and the upper vent column to prevent rattling between the lower column and the upper column.

[Expandable support]
As shown in FIGS. 4 and 5, the telescopic support of the present invention comprises two or more telescopic vents, and the surfaces between the struts of the two or more telescopic vents are opposed to each other with an interval between them. The side surfaces of the lower vent of each of the two or more telescopic vents are connected by at least the first connecting material and the second connecting material, and the side surfaces of the upper vent are connected by at least the third connecting material and assembled independently. It is a thing.

  In the telescopic support, the upper side surfaces of the upper vent are connected to each other by a third connecting material, and a fourth connecting material is disposed between the lower side portions, and the fourth connecting material is suspended from the third connecting material by a suspension material. A space is provided between the outer surface of the upper support column and the fourth connecting member, and when the upper vent is lowered, the space passes outside the first connecting member of the lower vent, and the upper vent is connected to the lower vent. Can be lowered to the bottom. The fourth connection member may be connected and fixed to the lower vent in a state where the upper vent is raised, and can be lowered when the connection fixing is released.

  In the two or more telescopic vents of the telescopic support, the upper vent can be moved up and down in synchronization.

  A sanddle for supporting the bridge girder can be provided on the telescopic support. In this case, a support material is laid over the upper vents of two or more telescopic vents connected at a distance, and the support material is placed on the support material, and each of the telescopic vents connected. A sandle can be provided in the upper position.

The telescopic vent of the present invention has the following effects.
(1) Since the connection structure of the upper vent and the lower vent is thin (planar) in which two struts are connected by a connecting material, a box shape in which four struts are connected in a square pillar shape (box shape) It is more compact than a vent and is easy to handle such as storage and transportation.
(2) Since the telescopic vent itself includes a drive mechanism, the upper vent can be moved up and down with the drive mechanism without using other devices.
(3) After the bridge girder is installed, the upper vent is lowered to create a gap between the upper vent and the bridge girder, and the hook can be locked to the upper vent from the gap to remove the vent from under the girder. Can be removed smoothly.
(4) Since the height of the vent can be adjusted simply by raising the upper vent, there is no need to stack other vents, and there is no trouble of stacking the vents or connecting the stacked vents.
(5) If the upper vent or the lower vent is provided with an installation portion for installing the drive mechanism and the drive source, the drive mechanism and the drive source can be installed in a compact manner, and if the upper vent and the lower vent are moved, the drive mechanism and the drive source are also Since it can move, movement (transportation) is also easy.
(6) If the lower cover is provided vertically on the lower vent and the upper cover is provided vertically, and the drive mechanism is accommodated in the upper cover or the lower cover, the drive mechanism can be installed compactly on the upper vent or the lower vent.
(7) A drive mechanism is provided in the upper cover so that the drive mechanism moves up and down as the upper vent moves up and down so that the upper cover and the drive mechanism are accommodated in the lower cover when the upper vent is lowered. The upper vent can be raised and lowered smoothly.
(8) The lower vent column and the upper vent column are made of a long, hollow material that can be accommodated in one column so that the other column can be raised and lowered, and when the upper vent is lowered, the column becomes the lower column column. The upper vent can be raised and lowered smoothly if it is housed inside or covered on the outside.
(9) If a locking mechanism is provided in the lower vent and the upper vent, the height can be adjusted and set to a desired height.

The telescopic support of the present invention has the following effects.
(1) Since the telescopic vent is used, the effect of the telescopic vent is provided.
(2) The support can be assembled by connecting an arbitrary number of telescopic vents, and the connection interval of the telescopic vents (interval in the arrangement direction of the vents) can be changed arbitrarily, so that it can be arbitrarily sized according to the width of the bridge girder Can be assembled and there are few restrictions on the usable site.
(3) Since the upper vents of two or more connected telescopic vents can be expanded and contracted in a synchronized manner, they can be expanded and contracted smoothly and efficiently.
(4) The fourth connection member of the upper vent is suspended from the third connection member by the suspension member, and a space is provided between the fourth connection member and the outer surface of the upper support column. The upper vent can descend to the lower part of the lower vent when the space passes through the outside of the first connector of the lower vent, and the upper vent moves up and down smoothly without interfering with the first connector of the lower vent. it can.
(5) Since the fourth connecting member is connected and fixed to the lower vent in a state where the upper vent is raised, the fourth connecting member is stable and can be lowered smoothly since the connection fixing is released and the lower vent is lowered.

The front view which is an example of the expansion-contraction type vent of this invention, and shows the state which the upper vent raised. The front view which is an example of the expansion-contraction type vent of this invention, and shows the state which the upper vent fell. Explanatory drawing of the drive mechanism and drive part in the state which was an example of the expansion-contraction type vent of this invention, and the upper vent fell. It is an example of the telescopic support work of this invention, Comprising: The perspective view which shows the state which the upper vent raised. It is an example of the telescopic support work of this invention, Comprising: The perspective view which shows the state which the upper vent fell. (A) is a longitudinal cross-sectional view of the locking mechanism of the telescopic vent according to the present invention, and (b) is an explanatory view showing a state in which the brace material of the upper vent is attached to the reinforcing plate with a coupling bolt. The top view which shows the fitting state of the lower support | pillar of the lower vent of the expansion-contraction type | formula of this invention, and the upper support | pillar of an upper vent.

(Embodiment 1 of telescopic vent)
An example of the telescopic vent of the present invention will be described with reference to FIGS. This extendable vent 1 is a combination of a lower vent 2 and an upper vent 3 that can be slid up and down (up and down), and the drive mechanism 4 moves the upper vent 3 up and down along the lower vent 2 to engage the raised upper vent 3. A stopper 5 (for example, a stopper pin 5 shown in FIG. 6A) is supported and positioned at a predetermined position (height).

[Lower vent]
As shown in FIGS. 1 and 2, the lower vent 2 has two upper parts (a pair of lower pillars) 6 arranged at intervals on the left and right sides (lateral directions) of the figures, and the upper connection member 7a horizontally Connected to each other, the lower portions of both lower struts 6 are laterally connected by a lower connecting member 7b, and the upper connecting member 7a and the left and right lower struts 6 are obliquely connected by two upper brace members 8a. The connecting member 7b and the left and right lower struts 6 are obliquely connected by two lower brace members 8b to maintain the distance. For example, a vertically long hollow material (pipe: square steel pipe) can be used for the lower support 6.

  A vertically long lower cover 9 is disposed vertically between the left and right lower struts 6 and between the upper connecting member 7a and the lower connecting member 7b. The lower cover 9 is a vertically long square pipe (longitudinal steel material), the upper end side of which is connected and fixed to the upper connecting member 7a, and the lower end side thereof is connected and fixed to the lower connecting member 7b.

  The upper connecting member 7a has a horizontally long box shape as shown in FIG. 4, and a driving motor M and a reduction gear necessary for operating the driving mechanism 4 thereon (on the installation portion on the upper surface side of the upper connecting member 7a). A gear box G, a pinion 4a, and the like in which other related members are accommodated are mounted (FIG. 3).

  A vertically long lap 10 is vertically disposed opposite the lower cover 9 between both lower struts 6 of the lower vent 2 and outside the upper connecting member 7a and the lower connecting member 7b. The lower end side of the material 7a is attached to the lower connecting material 7b. If the trap 10 is provided on the lower vent 2, it is easy to move up and down to the scaffold 11 described later.

  The scaffold 11 has a horizontally long box shape, and is attached between the lower supports 6 slightly below the upper connecting member 7 a of the lower vent 2. The scaffold 11 has a box shape in which the outer periphery of the bottom plate is surrounded by a peripheral wall and the upper surface is open. An operator can enter and exit the inside using the trap 10 and can work inside. is there. A metal mesh, expanded metal, etc. are used for the surrounding wall. The scaffold 11 may be foldable or non-foldable. Moreover, the thing which can be attached or detached to the lower vent 2, or the fixed type which cannot be removed may be used.

  An insertion hole 13 is opened at the upper end of the lower support 6. The insertion hole 13 penetrates from the front wall 6a to the back wall 6b of the lower column 6 as shown in FIG. A flat perforated reinforcing plate 15 (FIGS. 1, 6A and 6B) is attached to the outer surface of the front wall 6a of the lower insertion hole 13 and the outer surface of the rear wall 6b. Further, a connecting material base (for example, a short H-shaped steel) 18 (FIGS. 1 and 3) is fixed to the outer side surfaces of the two lower struts 6.

  A flat base plate 16 is attached to the lower ends of the left and right lower struts 6 by means such as welding, and a bracket 17 is attached to the lower outer peripheral surface of the lower strut 6 by means such as welding. Are attached to the base plate 16 by means of welding or the like for reinforcement. A mounting hole 16a (FIG. 4) is opened in the base plate 16.

[Up vent]
As shown in FIGS. 1 and 2, the upper vent 3 has two upper ends (a pair) of upper struts 14 arranged at intervals in the lateral direction (left and right in FIGS. 1 and 2). H-shaped steel) 20 is connected and fixed. The upper connecting member 20 projects both ends in the longitudinal direction (left and right ends in FIG. 1) to the outside of the upper struts 14 and can suspend suspension members 45 (FIG. 1) to be described later on the respective protrusions. It is like that. Also, brackets 19 (FIGS. 1 and 3) are attached to the outer side of the connecting corners of the upper struts 14 and the upper connecting member 20 (the back side in FIG. 1).

  The upper portions of the two upper struts 14 are connected to the upper end portion of the lower vent 2 by two brace members 21 stretched in an X shape. In this case, the upper end portions of the two brace members 21 are attached to the bracket 19 (FIG. 1), and the lower end portions are attached to the outer side of the back wall 6b (FIG. 6A) of the lower support column 6. Are connected by a connecting bolt 12 (FIG. 6B). When the upper vent 3 is raised as shown in FIGS. 1 and 4, the two brace members 21 are tensioned by the turnbuckle 22, but the upper vent 3 is lowered as shown in FIGS. 2 and 5. When the upper vent 3 is lowered, the tension at the turnbuckle 22 is relaxed, the coupling bolt 12 (FIG. 6B) is pulled out and hung down from the bracket 19 (FIG. 1). The brace material 21 does not hit the lower vent 2 (does not hinder descent).

  As shown in FIG. 7, the upper support column 14 is a size that can be inserted vertically into the lower support column 6 of the lower vent 2. For example, a steel pipe that is thinner than the lower support column 6 of the lower vent 2 is used. be able to. Four rods 23 (FIG. 7) are fixed vertically at the outer peripheral corners of the upper column 14 by means of welding or the like, and the rods 23 are placed in the gap 24 between the lower column 6 and the upper column 14. The thickness of the upper column 14 is set so as to prevent rattling of the upper column 14 when the upper column 14 moves up and down in the lower column 6. By providing the rod 23, the upper vent 3 can be raised and lowered smoothly.

  An upper cover 25 is disposed between the two upper struts 14 in FIG. 1 in the vertical direction. The upper cover 25 is a vertically long material that is U-shaped in plan view, and has an upper end fixed under the upper connecting member 20 and a lower end accommodated and disposed on the inner side of the lower cover 9 in a free state. When 3 is lowered, the upper cover 25 can be lowered along the lower cover 9 inside the lower cover 9.

  A rack 4 b is fixed in the upper cover 25. The rack 4b is fixed in the upper cover 25 with its gear surface (tooth surface) facing outward, so that the gear meshes with a pinion 4a (FIG. 1) provided on the lower vent 2, and the pinion 4a When the motor M rotates through the reduction gear in the gear box G, the motor M rises from the lowered state in FIG. 1 to the state in FIG. 1, and when the motor M rotates in reverse and the reduction gear in the gear box G rotates in reverse. 2 is lowered from the raised state of 1 to the state of FIG. 2, and the upper vent 3 is raised and lowered as the drive mechanism 4 is raised and lowered.

  A plurality of upper insertion holes 26 (FIG. 1) are opened in the upper support column 14 at intervals in the vertical direction. The upper insertion hole 26 is also opened from the front wall 14a (FIG. 6A) of the upper support column 14 to the rear wall 14b (FIG. 6A). A flat perforated reinforcing plate 27 (FIGS. 1 and 6A) is attached to the outer surface on the back side. As the upper vent 3 moves up and down, the upper column 14 moves up and down, and when the upper insertion hole 26 of the upper column 14 matches the lower insertion hole 13 of the lower column 6 as shown in FIG. By inserting the retaining pin 5 through both the insertion holes 13 and 26 from the outside of the insertion hole 13, the upper strut 14 can be stopped (positioned) at that position (height), and the upper vent 3 can be It can be fixed. Since the height can be adjusted only by inserting / removing the retaining pin 5 into / from both the insertion holes 13, 26, workability is good.

  A pin receiving member 30 (FIGS. 6A and 7) is attached below the upper insertion hole 26. The pin receiving member 30 has a half pipe shape (U-shape when viewed from the end surface), and its both ends in the axial direction are laid on the front wall 14a and the back wall 14b of the upper column 14 with its opening facing upward, Both ends are fixed to the front wall 14a and the back wall 14b by means such as welding. This pin receiving member 30 supports the stop pin 5 (FIG. 6 (a)) inserted through the upper insertion hole 26 of the upper column 14 from the outside of the lower insertion hole 13 of the lower column 6 from below when inserted. Is to do. Providing the pin receiving member 30 also serves as a guide for the tip of the locking pin 5 at the time of insertion, so that the locking pin 5 can be easily inserted. The locking pin 5 inserted and penetrated into the lower insertion hole 13 and the upper insertion hole 26 is locked to the lower support 6 by a stopper (not shown) so as not to drop out carelessly.

(Embodiment 2 of telescopic vent)
In the first embodiment, the case where the upper support column 14 is inserted into the lower support column 6 has been described as an example. However, the telescopic vent 1 of the present invention can be configured to cover the upper support column 14 on the outer side of the lower support column 6.

  In the first embodiment, the drive mechanism 4 is the pinion 4a / rack 4b. However, the drive mechanism 4 may be another mechanism as long as the upper vent 3 can be driven up and down. For example, a ball spline is arranged vertically. The upper vent 3 can be moved up and down by rotating it, the upper vent 3 can be moved up and down by manually operating the chain block, and the upper vent 3 can be moved up and down by a hydraulic cylinder, air cylinder, and other mechanisms. It can also be made possible.

  The upper cover 25 and the lower cover 9 can cover the drive mechanism 4 and can have other shapes and structures as long as they do not hinder the raising and lowering of the upper vent 3.

  In the first embodiment, the two-stage type provided with the lower vent 2 and the upper vent 3 is described as an example. However, the telescopic vent 1 of the present invention can be a three-stage type or more.

(Descent of upper vent)
To lower the upper vent 3 of the telescopic vent 1 of the present invention from the raised position in FIG.
(1) Remove the retaining pin 5 (FIG. 6A) from the telescopic vent 1 in the raised state shown in FIG.
(2) The drive motor M of the telescopic vent 1 is operated to rotate the pinion 4a via the reduction gear in the gear box G to lower the rack 4b. At the same time, the upper cover 25 to which the rack 4b is attached is moved. The upper vent 3 to which the upper cover 25 is connected is lowered by lowering.
(3) When the upper vent 3 is lowered to a desired height (for example, the height shown in FIGS. 1 and 3), the drive motor M is stopped, and from the lower insertion hole 13 of the lower support 6 as shown in FIG. The stopper pin 5 is inserted into the upper insertion hole 26 of the upper column 14 whose position matches the lower insertion hole 13 to stop the upper column 14 at a predetermined position, and the upper vent 3 is positioned at that position. .
(4) When the upper vent 3 is lowered to the lowest position as shown in FIG. 2, it is not necessary to insert the retaining pin 5, but it is necessary to prevent the upper vent 3 from being unintentionally displaced even if it receives an external force. The pin 5 can also be inserted.

(Upper vent rise)
To raise the upper vent 3 of the telescopic vent 1 of the present invention from the lowered position in FIG.
(1) Pull out the retaining pin 5 (FIG. 6A) from the telescopic vent 1 in the lowered state shown in FIG.
(2) The drive motor M of the telescopic vent 1 is rotated in the reverse direction to that at the time of lowering, and the pinion 4a is rotated in the reverse direction via the reduction gear in the gear box G to raise the rack 4b. The upper cover 25 is raised, and the upper vent 3 to which the upper cover 25 is connected is raised.
(3) When the upper vent 3 rises to a desired height (for example, the height shown in FIGS. 1 and 3), the drive motor M is stopped, and from the lower insertion hole 13 of the lower support 6 as shown in FIG. The stopper pin 5 is inserted into the upper insertion hole 26 of the upper column 14 whose position matches the lower insertion hole 13 to stop the upper column 14 at a predetermined position, and the upper vent 3 is positioned at that position. .

[Expandable support]
An example of the telescopic support work of the present invention is shown in FIGS. This support work is a combination of two telescopic vents 1 described above. 4 and 5, only the front side of the support is visible and the opposite side is not visible (not shown). In the following description, the front side connection that is visible will be described, but the opposite side is actually the same as the front side. It is connected.

  4 and 5, the two telescopic vents 1 are arranged opposite to each other on the fixed base B, and the outer upper portions of the lower struts 6 of the lower vents 2 of the telescopic vents 1 are connected by the first connecting member 40. Then, the outer lower portions of the lower strut 6 of the lower vent 2 are connected by the second connecting member 41, the first connecting member 40 and the second connecting member 41 are connected by the vertical member 43, and the outer surface upper portions of the upper vent 3 are connected to each other. The telescopic vent 1 is connected by a third connecting member 44, a suspension member 45 is suspended from the third connecting member 44, and a fourth connecting member 46 is horizontally coupled to the lower end of the suspension member 45 and suspended. They are connected to each other in the shape of a square hollow box while maintaining the above-mentioned facing distance.

  The fourth coupling member 46 suspended as described above is free without being fixed to the outer surface of the upper vent 3 (the outer surface of the upper column 14), and the coupling material base 18 (see FIG. 1 to 3), and a space 50 (FIG. 1, FIG. 3) is provided between the fourth connecting member 46 (FIG. 1) and the outer surface 14 c (FIG. 1) of the upper column 14. It is. By providing the space 50, when the upper vent 3 is lowered, the space 50 passes outside the first connecting member 40 (FIG. 1) of the lower vent 2, and the upper vent 3 reaches the lower portion of the lower vent 2 (FIG. 2). The upper vent 3 can be moved up and down smoothly without interfering with the first connecting member 40 of the lower vent 2. The fourth connecting member 46 is fixed to the connecting member base 18 (FIG. 4) of the lower vent 2 with a bolt (not shown) in a state where the upper vent 3 is lifted and assembled to a support as shown in FIGS. In addition, when the upper vent 3 is lowered, it is lowered after removing the bolt.

  In the lower vents 2 of the telescopic vents 1, the first connecting member 40 and the second connecting member 41 are connected by two lower oblique braces 47, and the upper vents 3 are connected by the third connecting member 44 and the fourth connecting member. The material 46 is connected by two upper diagonal braces 48.

  4 and 5, a support member 51 is disposed between the upper connecting members 20 that connect the upper ends of the upper struts 14 of the two telescopic vents arranged opposite to each other, and a sandal (saddle) is provided thereon. 52 is provided so that a bridge girder can be installed on the sandle 52. The sanddle 52 may have a shape, a mounting structure, or a number other than those illustrated.

  The two telescopic vents 1 connected as shown in FIGS. 4 and 5 can be controlled so that the drive source (motor in FIGS. 4 and 5) M of each telescopic vent 1 can be operated in synchronization. The operation and stop of both drive motors M can be operated by an operation panel (not shown). These controls can be performed by computer management with a control device.

  The telescopic vent 1 of the present invention can be used at a construction site of a bridge, as well as at a construction site of an expressway, and other construction work and civil engineering work.

DESCRIPTION OF SYMBOLS 1 Telescopic vent 2 Lower vent 3 Upper vent 4 Drive mechanism 4a Pinion 4b Rack 5 Stop pin (locking tool)
6 Lower strut 6a Front wall of lower strut 6b Rear wall of lower strut 7a Upper connecting material 7b Lower connecting material 8a Upper brace material 8b Lower brace material 9 Lower cover 10 Tarlap 11 Scaffold 12 Joint bolt 13 Lower insertion hole in lower strut 14 Upper strut 14a Front wall of upper strut 14b Back wall of upper strut 14c Outer surface of upper strut 15 Reinforcement plate 16 Base plate 16a Base plate mounting hole 17 Bracket 18 Connecting material base 19 Bracket 20 Upper connecting material 21 Brace material 22 Turnbuckle 23 Rod 24 Clearance between lower support column and upper support column 25 Upper cover 26 Upper insertion hole of upper support column 27 Reinforcement plate 30 Pin receiving material 40 First connection material 41 Second connection material 43 Vertical material 44 Third connection material 45 Hanging material 46 Fourth connecting material 47 Lower diagonal brace material 48 Upper diagonal brace material 50 Upper strut outer surface Between the first and fourth connecting members 51 Support material 52 Sandle (saddle)
B Fixed base G Gearbox M Drive motor

Claims (9)

  A telescopic vent that can be adjusted in height by extending and contracting in the vertical direction (vertical direction), and includes a lower vent and an upper vent that are combined so as to be movable up and down, and a drive mechanism that raises and lowers the upper vent. The two or more struts (lower struts) arranged opposite each other with a gap are connected to each other at least two locations on the upper and lower ends in the vertical direction with a connecting material, and the upper vent is spaced. Two or more struts (upper struts) that are arranged opposite to each other are connected to each other in the vertical direction by a connecting material, and the lower strut and the upper strut are combined vertically so that they can be moved up and down. A telescopic vent characterized in that the length of both the upper and lower vents can be expanded and contracted by raising and lowering the vent (height can be adjusted).   2. The telescopic vent according to claim 1, wherein an installation part for installing a drive mechanism and a drive source is provided in the upper vent or the lower vent, and the drive mechanism provided in the installation part is a drive source provided in the installation part. A telescopic vent that is driven.   3. The telescopic vent according to claim 1 or 2, wherein a lower cover is provided on the lower vent, an upper cover is provided vertically on the upper vent, a drive mechanism is provided in the upper cover or the lower cover, and the drive mechanism is moved up and down. A telescopic vent, wherein the upper vent is raised and lowered, and the drive mechanism and the upper cover or the lower cover to which the drive mechanism is attached are accommodated in the other cover when the upper vent is lowered.   The telescopic vent according to any one of claims 1 to 3, wherein the lower vent column and the upper vent column are hollow in length so that the other column can be moved up and down inside the one column. A telescopic vent, which is a scale material, and when the upper vent is lowered, the column is accommodated in the column of the lower vent or covers the outside thereof.   5. The telescopic vent according to any one of claims 1 to 4, wherein a locking mechanism is provided on the lower vent and the upper vent, and the locking mechanism locks the upper vent that moves up and down at a predetermined position of the lower vent. A telescopic vent characterized in that the upper vent can be moved up and down along the lower vent by releasing the lock.   6. Two or more telescopic vents according to any one of claims 1 to 5, wherein the two or more telescopic vents are arranged to face each other with a space between the struts spaced apart from each other. Side surfaces of the upper vent are connected by at least the first connecting material and the second connecting material, and the side surfaces of the upper vent are connected by at least the third connecting material and assembled so as to be self-supporting.   7. The telescopic support according to claim 6, wherein the upper side surfaces of the upper vent are connected by a third connecting material, a fourth connecting material is arranged between the lower side portions, and the fourth connecting material is connected to the third by a suspension material. A space is provided between the outer surface of the upper support column and the fourth connecting material, which is suspended by the material. When the upper vent is lowered, the space passes outside the first connecting material of the lower vent, and the upper vent A telescopic support, characterized in that can be lowered to the bottom of the lower vent.   8. The telescopic support according to claim 7, wherein the fourth connecting member is connected and fixed to the lower vent in a state where the upper vent is raised, and the connection fixing is released when the upper vent is lowered.   The telescopic support according to any one of claims 6 to 8, wherein the upper vents of two or more telescopic vents can be moved up and down in synchronization.

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