JP4624242B2 - Girder construction method - Google Patents

Description

  The present invention relates to a girder construction method, and more specifically, when a bridge girder is erected across an existing road, a site where a construction yard or the like cannot be secured on a rear extension line of the erection point (a construction work zone is not provided). This is related to the construction method in a narrow place that cannot be secured widely.

Conventionally, the following construction method has been adopted as a construction method for installing a girder across an existing road (including an expressway) across the existing road.
(1) When the installation space such as a ground yard can be secured on the rear extension line of the girder installation point.
In this case, install a ground yard on the rear extension line of the construction point, assemble a girder on the ground yard, operate the feeder equipped with the assembled girder laid on the ground yard, Sending out and erection toward the feed stand placed on the construction point (pier).
(2) When it is not possible to secure an installation space such as a ground yard on the rear extension line of the girder installation point.
In this case, a so-called collective erection method is used in which a ground yard is installed at a location other than the extension line of the girder installation point, and the girder assembled on the ground yard is lifted by a large crane and installed at the installation point. (For example, refer to Patent Document 1).

Hereinafter, the collective erection method using the large crane will be briefly described with reference to the drawings.
As shown in FIG. 11, a general collective erection method installs a ground yard 19 on existing roads 18 and 18 ', and assembles a girder 20 to be erected here. A large crane 21 is necessary to assemble the girder, and for that purpose, the large crane 21 is assembled at the same place. The assembled girder 20 stops the traffic on the existing road, and then is lifted by a large crane 21 and is installed between two points across the existing road.

  Therefore, a large crane is required depending on the scale (weight and girder length) of the girder installed. However, the transportation cost, assembly cost and dismantling cost of this crane occupy a large proportion of the construction cost. Furthermore, regarding the construction period, it takes a lot of days to transport, assemble and dismantle the large crane, and the construction period becomes long. Has the problem. In addition, the construction period becomes long, and at the same time, it takes a long time to stop the traffic on the existing road.

  Also, because of the crane, if the ground strength of the installation site is weak, the ground improvement 22 is performed, and in the case of rough terrain, the ground is improved flatly by placing concrete, etc. Each member used for improvement is disposed of as industrial waste. The construction cost of the ground improvement and the disposal cost thereof also increase the construction cost.

JP-A-6-101213

  The present invention has been made in view of the problems of the above-described conventional technology, and the problem is that the construction period can be reduced without using a large crane in a narrow site where a work work zone cannot be secured widely. It is to provide an erection method capable of shortening the length of a girder with a short traffic stop.

The technical means taken by the present invention in order to solve the above-mentioned problems is a construction method in which a girder is constructed across an existing road (including a highway) across the road,
(A) Install a ground yard along the existing road from the construction point on either side of the two points where the girder is built across the existing road, and turn the rotation means on the construction point to the tip of the ground yard A first step of installing a horizontal rail and bogie equipment on the upper side;
(B) a second step of assembling a girder of a predetermined length so that one end is located on the rotating means and the other end side is located on the bogie equipment on the ground yard;
(C) a third step of installing a support base in the vicinity of the installation point on the opposite side across the existing road, and extending and installing the horizontal rail on the ground yard side across the support base;
(D) a fourth step of operating the bogie equipment arranged on the horizontal rail to rotate the girder toward the support base around the rotation means, and horizontally span the girder between two points;
(E) a fifth step of removing the horizontal rail after completion of the rotation construction;
(Claim 1).
The installation point provided with the rotating means generally means a pier, but may be a support base (vent) other than the pier.
As the rotation means, a support for supporting a girder installed on a bridge pier or a support base, or a separate rotation shaft or the like may be arranged near the support.
In general, an H-section steel is used as the horizontal rail.

  According to the above means, a girder is assembled on the side of the existing road, and the assembled girder is moved laterally along the rails by operating the bogie equipment on the other side with the support part on one side of the installation point as the center of rotation. As a result, the girder is horizontally rotated around one installation point, and the other side of the horizontal rotation is placed on the other installation point to complete the installation.

The installation of the horizontal rail in the third step is to install a horizontal rail of a predetermined length on a support base, and to install an automatic mount equipped with a verticality adjusting means on an existing road, and to the ground yard side or the support The stand-side side rails may be extended and installed on the automatic frame, and connected to the opposite side rails (claim 2).
The above automatic gantry is equipped with verticality adjusting means at the four corners of the gantry. As the verticality adjusting means, hydraulic jacks are mounted in the vertical direction, and each hydraulic jack is actuated to instantly adjust the vertical (level). It is configured to be established.

  According to the above means, a horizontal rail that does not support the traffic is installed on the ground yard side and the support platform side, and then the automatic platform is installed on the existing road between the construction points at the same time as stopping the traffic. Since the horizontal rail on the ground yard side or the support base side is extended toward the base and connected to the corresponding horizontal rail on the opposite side to complete the horizontal rail, the time for stopping traffic can be shortened. In particular, the automatic gantry is automated so that the road surface gradient on the road is leveled by the hydraulic jack system below the gantry at the upper part of the gantry. It can greatly contribute to shortening the time for stopping traffic.

The bogie equipment is connected to a heavy load mounting device via a horizontal push jack to a clamp device that can be switched between fixed and open with respect to the horizontal rail, and the heavy load mounting device is a slide device that moves on the upper surface of the rail. The heavy article feed base having an endless track that rotates in a direction crossing the moving direction of the slide device is supported so as to be horizontally rotatable.
The clamping device may be any device that can switch between fixing and opening with respect to the horizontal rail, and when an H-shaped steel is used as the horizontal rail, a wedge-type clamping device that fixes the flange of the H-shaped steel with a wedge is provided. It is valid.
Moreover, the slide device placed on the horizontal rail moves (slides, slides) the upper surface of the rail (for example, the upper flange upper surface of the H-shaped steel), and the slide surface (sliding surface) of the slide device is Examples thereof include a device having a small friction coefficient, such as a device having a fluororesin material attached thereto, or a device having a rotatable roller (roller). As the apparatus, for example, a slide jack (hydraulic jack for moving heavy objects) proposed in Japanese Utility Model Publication No. 1-20323 can be used. The structure is configured such that a sliding member made of synthetic resin (for example, fluororesin) provided on the free piston by the hydraulic oil supplied to the oil chamber protrudes by a predetermined amount in the rail direction and slides on the rail.
Further, although the endless track band in the heavy article feed base is rotatable, the endless track band may be mechanically turnable / stoppable.
The above-mentioned cart equipment is used by connecting a plurality of cars according to the width of the installed girder so that the web core of the girder is mounted and supported on the heavy goods feed base in each car equipment.

  According to the above-mentioned means, the slide device equipped with the heavy article feed base for horizontally mounting the girder is slid and moved on the horizontal rail by the fixing of the clamp device and the extension operation of the horizontal push jack. At this time, since the rotation direction of the endless track in the heavy load feeder and the moving direction (the direction of the horizontal rail) of the slide device on which the heavy load feeder is mounted intersect, The feed base swivels horizontally and the slide device is allowed to move. As a result, the girder mounted horizontally across one installation point and the bogie equipment on the horizontal rail can be smoothly rotated about the installation point side as a rotation center.

Further, the rotating means sandwiches a sliding plate between a support and a girder installed on a bridge pier at a construction point, and rotates the girder on a contact surface with the sliding plate.
The sliding plate is preferably a member having a small coefficient of friction, such as a fluororesin plate, and is configured to be fitted and detached from the outside in the horizontal direction with respect to a rotating shaft (for example, a shear pin on the bearing side) serving as a rotation center. .

  According to the above means, since the frictional resistance is reduced by the sliding plate on the rotation side of the beam, the beam can be rotated smoothly.

The construction method of the girder of the present invention is based on the configuration of claim 1, without using a large crane with ground improvement and rough terrain, using a narrow place where a work work zone can not be secured widely and use of existing roads, Girder can be installed at once. Thereby, the construction period can be shortened and the construction cost can be reduced.
And when it is set as the structure of Claim 2, the installation of the horizontal rail for rotating and horizontal-sparing a girder can be performed by a traffic stop for a short time. This can greatly contribute to shortening the construction period.

  Moreover, the structure of Claims 3 and 4 can perform the rotation of a girder, and a horizontal work smoothly. And in this rotation and horizontal cutting, it can respond widely without being restricted by the weight of the girder. That is, although there is a considerable restriction on the lifting capacity of a large crane, the rotating / staking method of the present invention is insensitive to the weight of a girder.

Hereinafter, the construction method according to the present invention will be described with reference to the drawings.
FIG. 1 shows a case where a girder 2 is installed on the existing roads 1 and 1 'across the installation points a and b across the existing roads 1 and 1', and the girder is installed over the installation points a and b. Is assembled on the side along the existing road 1, and after assembling, the existing road 1,1 ' The other side of the girder is moved and mounted on the other installation point by moving on the horizontal rail installed and installed across the other installation point.

Hereinafter, the construction process will be described.
[First step]
As shown in FIG. 3, first, bridge piers 3 and 3 ′ supporting the girder 2 are installed upright at the construction points a and b where the girder 2 is constructed across the existing roads 1 and 1 ′. Rotating means 5 using a support 4 is mounted on the pier 3, and a ground yard 6 is installed using a vent along the existing road 1 from the vicinity of the pier 3 at the installation point a.
Further, on the tip side of the ground yard 6, that is, on the side opposite to the pier 3 side, a horizontal rail 8 a for rotating the assembled girder 2 is installed via a vent 7, and further, the carriage equipment 9 is placed on the horizontal rail 8 a. Equipped with.

[Second step]
The girder 2 is assembled on the ground yard 6 completed in the first step. Thereby, the girder 2 assembled on the ground yard 6 is placed over the rotating means 5 on the bridge pier 3 and the bogie equipment 9 on the horizontal rail 8a.

The support for supporting the rotating means 5 can be a vent installed separately from the pier 3, and the rotating surface of the rotating means 5 is a sliding plate (for example, a fluororesin plate) 10 having a small friction coefficient between the supports 4. After rotating the girders 2, the girders are jacked up to remove the sliding plate 10, and the function of the support 4 can be restored.
Since the horizontal rail 8a guides the girder 2 assembled on the ground yard 6 on the bogie equipment 9, it is incorporated into the vent constituting the ground yard 6 with its height adjusted. Leave in.

[Third step]
As shown in FIG. 4, the installation of the girder 2 assembled in the second step is completed, and a vent is used on the opposite pier 3 'across the existing roads 1, 1' immediately before the girder 2 is installed. The support base 11 is installed, and the horizontal rail 8b is installed on the support base 11.
Further, at the same time as stopping the traffic on the existing roads 1 and 1 ′, the automatic mount 12 is installed on the existing road 1 or 1 ′ (existing road 1 in the drawing). The horizontal rail 8c in the center is connected to the tip of the horizontal rail 8a on the yard 6 side and is extended and mounted on the automatic mount 12, and the horizontal rail 8b on the support base 11 is connected to the horizontal rail 8b. Complete.
In addition, as shown in the figure, the horizontal rail 8 is installed on the side of the support base 11 opposite to the ground yard 6 side by installing the horizontal rails 8a and 8b having a predetermined length, and then the existing road 1 or 1 '. It is not limited to the work process in which one of the horizontal rails is installed on the top and the horizontal rail is extended and connected to the other horizontal table, and the horizontal rails 8b and 8c are connected to the horizontal rail 8a. You may connect with.
Further, the horizontal rail 8 is formed to have a required length by connecting a predetermined length of H-shaped steel by welding.

The automatic gantry 12 is an automatic system that adjusts the road surface gradient on the road to a level at the upper part of the gantry by a hydraulic jack system under the gantry, and is a facility that can obtain a predetermined planned height required for the rotation and horizontal intercept of the girder This greatly contributes to shortening the time for stopping traffic.
The base is constructed by assembling H-shaped steel in a cross-beam shape, and hydraulic jacks are vertically supported via brackets at the four corners of the base, and a vent and a steel material are used to form a predetermined height. The base is erected, and the size of the base can be freely adjusted by adjusting the distance between the H-section steels, and they are connected and fixed with bolts and nuts.

[Fourth step]
After the installation of the horizontal rail 8 is completed, as shown in FIG. 5, the carriage equipment 9 mounted on the horizontal rail 8 is operated to place the girder 2 around the rotating means 5 on the bridge pier 3. Turn horizontally toward 11 side. And as shown in FIG. 6, the front end side of the girder 2 is moved to the pier 3 'and installed.

As shown in FIG. 9, the bogie equipment 9 for pretending and rotating the girder 2 is mounted with a heavy load on a clamping device 14, 14 ′ capable of switching between fixing / opening with respect to the precessing rail 8 via a horizontal pushing jack 15. The devices 16 and 16 'are connected to each other. Note that the number of the heavy load mounting devices 16 and 16 ′ is determined according to the size of the digit 2 or the like. The drawing shows a state in which two heavy load mounting devices are connected.
The heavy load mounting devices 16 and 16 ′ have a heavy load feed base 16 b provided with an endless track that rotates in a direction intersecting the moving direction of the slide device on a slide device 16 a that moves along the pre-rail 8. Is supported so as to be horizontally rotatable.
The slide device 16a is configured such that two slide jacks 17 are supported on a base 16c with a horizontal turning center of a heavy load feed base 16b interposed therebetween.

[Fifth step]
After completion of the rotation and horizontal installation of the girder 2, the horizontal rail 8c and the automatic mount 12 are removed as shown in FIG. 7, and the traffic stop of the existing roads 1, 1 ′ is released to enable traffic.
Further, at a later date, the lateral feed rail 8a on the ground yard 6 side, the lateral feed rail 8b on the support base 11 side and the bogie equipment 9 will be removed, and a girder 2 will be placed on the existing roads 1, 1 'as shown in FIG. Is completed.
The removal of the lateral feed rail 8a on the ground yard 6 side and the lateral feed rail 8b and the carriage equipment 9 on the support base 11 side may be performed together with the removal of the horizontal rail 8c and the automatic mount 12, In order to make the restriction time for stopping traffic on the roads 1 and 1 'as short as possible, the division removal is effective.

Explanatory drawing which shows the outline of the construction method of the girder which concerns on this invention. The side view which shows the support structure of the bridge pier which supports one side of a girder. The same explanatory view showing the 1st and 2nd process. It is explanatory drawing which shows a 3rd process, (a) is a top view, (b) is a side view. It is explanatory drawing which shows the middle state of the rotation of the 4th process, and a horizontal intercept, (a) is a top view, (b) is a side view. It is explanatory drawing which shows the final state of rotation of 4th process, and a horizontal intercept, (a) is a top view, (b) is a side view. Explanatory drawing which shows a 5th process. Explanatory drawing which shows the construction completion state of a girder. Partially cutaway side view showing the bogie equipment used for the girder construction method The top view which shows the cart apparatus. Explanatory drawing which shows the construction method using the conventional large crane.

Explanation of symbols

1, 1 '... Existing road 2 ... Girder 3, 3' ... Pier 4 ... Support
5 ... Rotating means 6 ... Ground yard
8 ... Traverse rail 9 ... Dolly equipment
10 ... Sliding plate 11 ... Support stand
12 ... Automatic base 14, 14 '... Clamping device
15 ... Horizontal push jack 16, 16 '... Heavy load device
a, b ... installation point

Claims (4)

It is a construction method to build a girder across an existing road across the road,
(A) Install a ground yard along the existing road from the construction point on either side of the two points where the girder is built across the existing road, and turn the rotation means on the construction point to the tip of the ground yard A first step of installing a horizontal rail and bogie equipment on the upper side;
(B) a second step of assembling a girder of a predetermined length so that one end is located on the rotating means and the other end side is located on the bogie equipment on the ground yard;
(C) a third step of installing a support base in the vicinity of the installation point on the opposite side across the existing road, and extending and installing the horizontal rail on the ground yard side across the support base;
(D) a fourth step of operating the bogie equipment arranged on the horizontal rail to rotate the girder toward the support base around the rotation means, and horizontally span the girder between two points;
(E) a fifth step of removing the horizontal rail after completion of the rotation construction;
A construction method of a girder characterized by having   The installation of the horizontal rail in the third step is to install a horizontal rail of a predetermined length on a support base, and to install an automatic mount equipped with a verticality adjusting means on an existing road, and the ground yard side or the support base The girder erection method according to claim 1, wherein a lateral side rail is extended and installed on the automatic frame and connected to the opposite side rail.   The bogie equipment is connected to a heavy load mounting device via a horizontal push jack to a clamp device that can be fixed / opened with respect to the horizontal rail, and the heavy load mounting device slides along the rail. The girder according to claim 1 or 2, characterized in that the apparatus supports a heavy load feed base provided with an endless track that rotates in a direction intersecting the moving direction of the slide device so as to be able to turn horizontally. Construction method.   4. The rotating means according to claim 1, wherein a sliding plate is sandwiched between a support and a girder installed on a bridge pier at a construction point, and the girder is rotated on a contact surface with the sliding plate. Construction method of the girder described in the section.

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