JP2007032005A - Friction-coefficient reducing mechanism for sliding support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a friction-coefficient reducing mechanism for a sliding support, which can reduce the coefficient of friction between a slide-traveling surface and the sliding support by using a relatively simple device, facilitate installation and removal, and bring about cost reduction, the improvement of constructibility, etc., in a sliding construction method for a steel-framed structure etc. <P>SOLUTION: In the sliding construction method in which an undersurface of a lower flange 2a of a lower steel-frame beam 2 of an upper structure B slides as the slide-traveling surface on the sliding pad 1b of the sliding support 1 on a lower structure A, the friction-coefficient reducing mechanism 10 comprises a strip-shaped stainless-steel sheet 11 which is sufficiently long in a sliding direction, a sheet feeding device 12 which is installed in the rear of the sliding support 1, and a sheet recovery device 13 which is installed ahead of the sliding support 1. A sheet 11 is automatically pulled out from the device 12 only by sliding the upper structure B, slid along with the upper structure B on the sliding support 1 in the state of being stuck on the undersurface of the lower flange 2a, and recovered by the device 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a frictional resistance reduction mechanism for a slide bearing used when a steel structure such as a building or a bridge is constructed by a slide method.

  For example, it is planned to build a station terminal building on the upper part of the platform of an existing station, and the present applicants constructed a lower structure consisting of main pillars at a construction site of a steel structure such as a station terminal building. An end frame is constructed on one end side of the lower structure, and the upper structure is slid to the other end side while assembling the upper structure on the end frame. When the predetermined installation position is reached, the upper structure is lifted down. An application has already been filed for a slide method for erection on the lower structure (see Patent Document 1).

  In this slide method, a slide bearing is provided on the lower structure (above the beam of the end frame and the upper part of the column), and the lower surface of the upper structure (lower surface of the lower flange of the steel beam) is used as the slide running surface. Running on a slide bearing. A polyamide resin slide pad is attached to the top of the slide support to reduce the friction coefficient. However, if the slide running surface remains the iron surface, a large frictional force is generated due to rusting of the iron surface and the slide. There were problems such as unstable movement.

  If measures are taken to reduce the friction coefficient of the sliding surface, both the slide device jack load for sliding the upper structure and the slide support horizontal reaction force can be reduced. For this reason, in the conventional slide bearing, as a method of reducing the friction coefficient, a method of applying a lubricant such as grease directly to the lower surface of the lower flange of the steel beam on the sliding surface, a stainless steel plate is attached to the entire lower surface of the lower surface of the steel beam, Further, a method of applying a lubricant to the lower surface of the stainless steel plate has been used. The stainless steel plate was attached with a detachable attachment jig and removed after the slide was completed.

  Further, Patent Documents 2 and 3 are prior arts related to the present invention. In the invention of Patent Document 2, the bridge girder is constructed by supporting the bridge girder by surface contact with a slide base and a slide base, and sliding the bridge girder by alternately operating a horizontal jack and a vertical jack. In the invention of Patent Document 3, in the extrusion construction method of a bridge girder, a vertical jack is attached to the tip of a horizontal jack provided on a sliding support that supports the bridge girder, a sliding plate is provided at the bottom of this vertical jack, Is provided with an increased friction plate such as a rubber plate, and the bridge girder is pushed forward by alternately operating a horizontal jack and a vertical jack.

JP 2005-36485 A Japanese Patent Publication No. 47-18704 JP-A-7-97191

  In the case of the above-mentioned method of attaching the stainless steel plate to the entire lower surface of the steel beam lower flange, the friction coefficient can be reduced by the stainless steel plate, but it is necessary to produce many stainless steel plate mounting jigs, and before the slide. There is a problem that the troublesome work of attaching to the entire surface and removing it after completion of the slide is necessary, which is costly and lowers the workability.

  In addition, in the case of a method of reducing the friction by applying a lubricant such as grease to the lower surface of the lower flange of the steel beam, preparation work is simple, but it is necessary to completely remove the grease and the like in order to perform painting. There is a problem that workability is reduced.

  The present invention is intended to solve the problems as described above, and in the sliding method of a steel structure or the like, the friction coefficient of the slide running surface and the slide support can be reduced with a relatively simple device, The purpose is to provide a friction coefficient reduction mechanism for slide bearings that is extremely easy to install and remove, reducing costs and improving workability.

  The invention according to claim 1 of the present invention is used in a slide method in which an upper structure is supported and slid by a slide support installed on the lower structure, and the upper structure is installed at a predetermined position on the lower structure. This is a mechanism for reducing the friction coefficient of the slide bearing. A belt-like sheet that is continuous in the sliding direction is placed between the slide running surface on the lower surface of the upper structure and the slide bearing, and the friction coefficient between the slide running surface and the sheet is the sheet. The sheet is pulled out from the sheet supply device using the fact that the coefficient of friction between the slide support and the slide bearing is larger, slides on the slide support together with the upper structure while being stuck to the slide running surface, and is collected by the sheet collection device. It is comprised so that it may be, It is a friction coefficient reduction mechanism of the slide bearing characterized by the above-mentioned.

  The present invention supports a steel frame structure such as a station building by a slide support installed on a lower structure composed of main pillars, and when installed by sliding, a bridge girder made of steel or concrete is used as a lower structure. It is applied to the case where it is supported by a slide support installed on the bridge pier and is slid and installed. The sheet may be made of a material having a smaller friction coefficient than the sliding surface on the lower surface of the upper structure, and a steel sheet, a resin sheet, or the like can be considered. When the slide running surface is made of steel (such as general structural carbon steel), it is preferable to use a stainless sheet that is not easily rusted. It is preferable to use a slide bearing having a slide pad having a small friction coefficient, such as a polyamide resin, on the upper part. If a lubricant such as grease is applied to the lower surface of the sheet, the friction coefficient can be further reduced.

  If the sheet supply device and the sheet collection device are arranged before and after the sliding direction of the slide support, and the sheet pulled out from the sheet supply device is attached to the sheet collection device through the slide support, the slide running surface and the slide support on the lower surface of the upper structure are attached. The sheet is sandwiched between the two, and the sheet is automatically pulled out only by the sliding movement of the upper structure, and is moved and collected while sticking to the sliding surface. Since a sheet such as a stainless steel sheet has a smaller friction coefficient than a sliding surface such as an iron surface, the upper structure can be slid with a low frictional force.

  The invention according to claim 2 of the present invention is the sliding bearing friction coefficient reduction mechanism according to claim 1, wherein each of the sheet supply device and the sheet recovery device has a drum, and the sheet is pulled out from the supply drum, and the recovery drum A friction coefficient reduction mechanism for a slide bearing, wherein the friction coefficient reduction mechanism is configured to be wound around a roller.

  The sheet is a strip-shaped thin plate having a thickness of about 0.1 mm, and a box that can be folded and stored can be used for the sheet supply device and the sheet collection device, but a drum (reel) type is preferable. In the case of the drum type, the sheet can be stored in a compact manner and can be pulled out and collected smoothly. Also, the drum type can be changed to a roller type, and the sheet can be made endless.

  The invention according to claim 3 of the present invention is the mechanism for reducing the friction coefficient of the slide support according to claim 2, wherein the tension applying device (weight) applies tension in the sliding direction to the collecting drum or the supply drum and the collecting drum. , A motor, etc.).

  Sheet supply / recovery is performed using the frictional force between the slide running surface and the sheet, but the weight is suspended by a cable wound around the drum rotation shaft, and the weight is applied to the drum by the weight, or By connecting a motor to the drum rotation shaft and applying rotational force to the drum, it is possible to smoothly supply and collect sheets, and to maintain constant tension at all times to prevent sheet sagging. it can. Further, the drum can be provided with a ratchet mechanism to prevent idling and reverse rotation when no load is applied.

  (1) In the sliding method of steel structures, etc., the sheet is pulled out from the sheet feeding device and slid with the upper structure on the slide support while sticking to the slide running surface of the upper structure, to the sheet collecting device. Since it is configured to be recovered, the upper structure can be slid and moved with a low frictional force by a relatively simple mechanism that requires little power or little power.

  (2) Since it is composed of a sheet, a sheet supply device, and a sheet collection device, installation / removal is extremely easy, and a sheet that reduces frictional force can be disposed only on a portion that contacts the slide support.

  (3) The friction coefficient between the slide running surface and the slide support can be reduced with a relatively simple device, and it is no longer necessary to produce many mounting jigs for conventional stainless steel plates, and troublesome installation and removal work. There is no need to remove grease or other lubricants for painting, and costs can be reduced and workability can be improved.

  Hereinafter, the present invention will be described based on the illustrated embodiments. This embodiment is an example applied to a slide method of a steel structure such as a building. FIG. 1 is a side view showing an example of a basic structure of a sliding bearing friction coefficient reducing mechanism of the present invention. FIG. 2 is a side view and the like showing an overall arrangement when the present invention is applied to a slide method for a station building or the like. FIG. 3 is a side view showing a friction coefficient reducing mechanism on the pillar in FIG. FIG. 4 is a plan view seen from the sliding direction of FIG.

  In FIG. 1, a pair of slide supports 1 are arranged at predetermined support points on the lower structure A at a predetermined interval in the slide direction, and an upper structure B having a steel structure can be slid by the slide support 1. And is slid by a slide device (not shown). The slide support 1 is constructed by attaching a slide pad 1b made of polyamide resin or the like on a support frame 1a, and the lower surface of the lower flange 2a of the lower steel beam 2 of the upper structure B slides on the slide pad 1b as a slide running surface. To do.

  In such a slide support, according to the present invention, a sheet 11 made of a strip-shaped stainless steel that is sufficiently long in the slide direction, a sheet supply device 12 installed at the rear of the slide support 1 in the slide direction, and a front of the slide support 1 in the slide direction. The friction coefficient reduction mechanism 10 of the slide support 1 is configured by the sheet collecting device 13 installed in the above.

If the stainless steel sheet 11 is pulled out from the sheet supply device 12 without the superstructure B before being slid and passed over the pair of slide supports 1 and 1 and attached to the sheet collection device 13, the slide support 1 Since the friction coefficient μ ₁ between the slide running surface of the lower flange 2 a and the stainless steel sheet 11 is larger than the friction coefficient μ ₂ between the stainless steel sheet 11 and the slide support 1, By simply sliding the upper structure B, the stainless steel sheet 11 is automatically pulled out from the sheet supply device 12 and slides on the slide support 1 together with the upper structure B in a state of being stuck to the lower surface of the lower flange 2a. The sheet is collected by the sheet collecting device 13.

Since the friction coefficient μ ₂ between the stainless steel sheet 11 and the slide support 1 is small, the upper structure B can be slid with a low frictional force, and both the slide device jack load and the slide support horizontal reaction force can be reduced. . If a lubricant such as grease is applied to the lower surface of the stainless steel sheet 11, the frictional force can be further reduced. Since it is not necessary to apply anything to the lower surface of the lower flange of the steel beam, it is not necessary to completely remove the grease for painting or the like.

  The stainless steel sheet 11 has a thickness of about 0.1 mm. The plate width may be the same width as the slide support 1. A drum (reel), a box (container), a roller, or the like can be used for the sheet supply device 12 and the sheet collection device 13. FIG. 1A shows a case where a drum is used. A length corresponding to the slide movement distance is wound around the supply drum 12a, and the supply drum 12a is wound around the collection drum 13a as the slide moves. FIG. 1B shows a case in which a box is used. The box is folded and stored in the supply box 12b, and is collected so as to be folded in the collection box 13b. FIG. 1C shows a case where a roller is used, and the sheet 11 can be made endless by being wound around the supply roller 12c and the collection roller 13c.

  The supply and recovery of these sheets use the frictional force of the steel beam lower flange 2a of the superstructure and the stainless steel sheet 11, so no power is required, but the sheets can be supplied and recovered smoothly, In order to prevent sagging, a tension applying device such as a weight can be used. A ratchet mechanism or the like can also be used to prevent idling and reverse rotation when there is no load. After the slide is completed, in order to install the upper structure B, it is necessary to remove the stainless steel sheet 11 between the upper structure B and the slide support 1, but the upper structure B is supported from the slide support 1 to the lower part. The structure is moved to the structure A, and the stainless steel sheet 11 is completely collected in the sheet collecting device 13 by slightly lowering the slide support 1.

  In the case of the friction coefficient reducing mechanism 10 of the slide support 1 as described above, no power is required, and the stainless steel travel surface only needs to be in contact with the slide support 1, and it is easy to place and collect the stainless steel sheet. In addition, a large number of attachment jigs and troublesome attachment / removal operations can be eliminated when attaching a conventional stainless steel plate to the entire surface.

  Next, the example of FIG. 2 is a case where a steel structure such as a station building is constructed by a slide method. In general, a main pillar 20 is erected and a steel frame is formed using the pillar 20 on one end side. An assembly gantry (end frame) 21 is constructed, and the upper structure B is sequentially assembled on the steel assembly gantry 21 and extruded forward by a slide device such as a hydraulic jack device. The upper structure B is supported by the slide support 1 installed on the pillar 20, and the upper structure B that has reached a predetermined position is lifted down and installed on the lower structure A.

  A plurality of slide supports 1 are arranged on the steel beam 22 of the steel assembly gantry 21 at intervals in the sliding direction, and the sheet feeding device 12 is arranged at the rear end of the steel assembly gantry 21 in the sliding direction. A sheet collecting device 13 is installed on the slide support 1 at the front end, and the stainless steel sheet 11 is disposed over almost the entire length of the steel frame assembly base 21.

  A weight 24 is attached to the drum shaft of the sheet collecting apparatus 13 via a cable 23 to introduce a certain tension to the stainless steel sheet 11 to prevent sagging. Further, a sheet restraining device 25 is disposed between the slide supports 1 and 1 so that tension is introduced into the stainless steel sheet 11 so that sagging does not occur. As shown in FIGS. 2C and 2D, the sheet pressing device 25 can be composed of a roller 25a and a spring 25b. The roller 25a is disposed on the stainless sheet 11 and attached to both ends thereof. The spring 25b is attached to the upper surface of the steel beam 22, and the stainless steel sheet 11 is pulled downward to maintain this state.

  As shown in FIG. 2A and FIG. 3, the main pillar 20 is provided with a main beam bracket 30 on the left and right sides, and the slide support 1 is installed on the beam bracket 30. . In the slide support 1 in the column 20, the support frame 1a and the slide pad 1b can be moved up and down by a hydraulic jack 31 (see FIG. 3). In the sliding process, the front end portion of the upper structure B that protrudes forward in a cantilevered manner slightly bends downward, so that the slide support 1 is lowered and retracted to avoid this, and when the front end portion passes, 1 is raised to support the slide. Further, after the slide is completed, the upper structure B is slightly lifted down and installed on the lower structure A.

Such a slide support 1 is connected to the upper part of the column 20 via a support member 32, the sheet supply device 12 is attached to the slide support 1 on the rear side in the sliding direction, and the sheet collecting device 13 is attached to the slide support 1 on the front side. . A weight 34 is attached to each of the rotation shafts of the supply drum 12a and the recovery drum 13a via a cable 33, and the weight W ₁ of the rear weight 34 is set to be heavier than the weight W ₂ of the front weight 34. Thus, an appropriate tension can be applied to the stainless steel sheet 11. Although not shown, tension can be applied to the sheet 11 by connecting a motor to the drum rotation shaft and applying a rotational force to the drum. The recovery drum 13a is provided with a ratchet mechanism to prevent idling and reverse rotation when no load is applied.

  After the slide is completed, it is necessary to remove the stainless sheet 11 from between the lower steel beam 2 and the slide support 1 of the upper structure B. However, as shown in FIG. If the sheet 11 is disposed so as to sandwich the sheet 11, the slide support 1 can be lowered to deposit the upper structure B on the pillar 20, and the stainless sheet 11 passes between the liner plates 40, 40 to the sheet collection device 13. It can be recovered.

  Thereafter, the slide support 1 is raised to remove the liner plate 40, the slide support 1 is lowered to install the upper structure B on the pillar 20, and the upper and lower pillars are joined together by bolts or welding. Next, after removing the slide support 1 and the friction coefficient reducing device 10, the lower steel beam 2 of the upper structure B is lowered and joined to the beam bracket 30.

  In addition, although the above demonstrated the case where it applied to the slide construction method of steel frame structures, such as a station building, this invention can be applied not only to this but slide construction methods, such as a steel bridge and a concrete bridge.

It is a side view which shows the example of the basic structure of the friction coefficient reduction mechanism of the slide bearing of this invention, (a) is a case where a sheet supply and collection | recovery apparatus is a drum type, (b) is a box type, (c ) Is for the roller type. It is a case where this invention is applied to slide construction methods, such as a station building, (a) is a side view which shows the whole arrangement | positioning, (b) is a side view of a sheet | seat suppression apparatus, (c) is the top view. It is a side view which shows the friction coefficient reduction mechanism on the pillar in FIG. 2 is a friction coefficient reduction mechanism of FIG. 2, (a) is a view seen from the sliding direction, (b) is a plan view.

Explanation of symbols

A ... Lower structure B ... Upper structure 1 ... Slide support 1a ... Supporting frame 1b ... Slide pad 2 ... Lower steel beam 2a ... Lower flange 10 ... Friction coefficient reduction mechanism 11 ... Sheet (stainless steel sheet)
DESCRIPTION OF SYMBOLS 12 ... Sheet supply device 12a ... Supply drum 12b ... Supply box 12c ... Supply roller 13 ... Sheet collection device 13a ... Collection drum 13b ... Collection box 13c ... Collection roller 20 ... Main pillar 21 ... Steel frame assembly frame (end frame)
22 ... Steel beam 23 ... Cable 24 ... Weight 25 ... Sheet restraint device 25a ... Roller 25b ... Spring 30 ... Main beam bracket 31 ... Hydraulic jack 32 ... Support member 33 ... Cable 34 ... Weight 40 ... Liner plate

Claims (3)

It is a sliding bearing friction coefficient reduction mechanism used in the slide method that supports and slides the upper structure with the slide support installed on the lower structure and lays the upper structure at a predetermined position on the lower structure.
A belt-like sheet that is continuous in the sliding direction is placed between the slide running surface on the lower surface of the upper structure and the slide support, and the friction coefficient between the slide running surface and the sheet is larger than the friction coefficient between the seat and the slide support. The sheet is pulled out from the sheet supply device, and is slid on the slide support together with the upper structure while being stuck to the slide running surface, and is collected by the sheet collection device. The friction coefficient reduction mechanism of the slide bearing.   2. The sliding bearing friction coefficient reducing mechanism according to claim 1, wherein each of the sheet supply device and the sheet collection device has a drum, and the sheet is drawn out from the supply drum and wound around the collection drum. A friction coefficient reduction mechanism for slide bearings characterized by   3. The friction coefficient reducing mechanism for a slide bearing according to claim 2, wherein a tension applying device for applying a tension in a sliding direction to the sheet is provided on the collection drum or the supply drum and the collection drum. Friction coefficient reduction mechanism.

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