JP4041716B2 - Girder feeding construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a girder (main girder) delivery construction method, and more particularly to an improvement in a construction method that continuously feeds a girder without attaching a handrail to the leading end of the main girder.
[0002]
[Prior art]
As a method of laying a steel main girder on a pier (pier), there is a hand-drawn type feeding method in which a hand-roller is connected and attached to the tip of the main girder to be sent out.
In this method, a truss-type or girder-type light handrail is connected to the tip of a steel main girder, and the main girder supported on a track or rail is supported by a device or a roller. This is a method of installing a main girder on a peer (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 3-90703
The hand girder at the leading end of the main girder in this hand feeding type feeding method is attached in order to smoothly deliver the leading end of the main girder to be delivered to a peer located in front of the feeding direction. That is, the main girder increases in distance from the fulcrum as the feeding progresses, and accordingly, the leading end of the main girder bends downward, and when fed as it is, the leading end of the main girder cannot transfer to the peer. For this reason, the hand spreader connected to the leading end of the main girder is composed of a truss type or girder type using an angle material or the like, and the thickness in the vertical direction is made thinner toward the tip side. The tip is attached upward from the tip of the main girder. As a result, even if the leading edge of the handbill bends downward as the feeding progresses, it is possible to smoothly transfer onto the feeding table on the peer.
[0005]
[Problems to be solved by the invention]
However, the hand girder is connected to the leading end of the main girder, so that the weight of the hand girder increases, and as a result, the bearing pressure increases, so the main girder itself has to be reinforced. .
Also, as mentioned above, the handrail is connected and the main girder itself is reinforced to withstand the bearing pressure, so that the overall weight increases, so that the feeding device needs to be strong according to the weight. Become.
[0006]
In addition, since a long handrail is connected to the tip of the main girder, there is a problem that it is easily affected by the wind and hinders the progress of the erection work.
Of course, the number one problem with the presence of a hand-roller is the cost associated with the manufacture and installation of the hand-roller and the transportation of these components.
That is, it is formed by combining steel materials, and after forming, it is coated with rust prevention etc., it is connected to the tip of the main girder, and after the main girder is installed, the handbill must be removed from the main girder. The cost required for this is tens of millions of yen.
[0007]
The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to eliminate the bending of the main girder without connecting the handrail to the main girder and to ensure the following. It is to provide a delivery erection method that can be reached on the peer.
[0008]
[Means for Solving the Problems]
The technical means taken by the present invention in order to solve the above-described problems is that, when a main girder is installed on a peer, a wire is stretched from a ground yard that assembles and forms the main girder toward each peer located in front of the main girder. It is a delivery construction method in which the main girder is sent and fixed along the wire, and the leading end of the main girder that is not connected to the handrail is guided and reached on the feed stand on the peer, the wire being on the wire The main girder is stretched and fixed so that the lower surface of the main girder reaches substantially the same height as the upper surface of the feed table when it reaches the feed table (Claim 1).
The form of supporting the main girder with the wire may be either direct support or indirect support, such as directly supporting the lower surface of the main girder with the wire, or attaching and supporting the wire abutting members on the left and right sides of the main girder. .
That is, a wire was stretched from the ground yard to each front peer, and the main girder was supported and sent out by the wire so that the leading end of the main girder was smoothly transferred to the feed base on the peer. Moreover, the height of the wire to be stretched is only required to be able to support a height at which the main girder to be fed can be transferred onto the feed base on the peer.
A crawler-type feed stand, a roller-type feed stand or the like is effective as a feed stand installed on the peer.
Moreover, the power (feeding device or pulling device) for feeding the main girder is a combination of a horizontal jack and a carriage (slide base) that are generally used today, or a wire is connected to the main girder, and the wire is connected to the wire. Any of a combination of a clamp and a jack, or one that pulls in the direction of the bridge axis with a winch or the like may be used.
[0009]
The wire extending from the ground yard to the front peers is preferably a plurality of parallel wires spaced at a predetermined interval in a direction perpendicular to the main girder feeding direction (bridge axis direction). (Claim 2). Thereby, the main girder can be stably supported and sent out.
[0010]
And the main girder sent out on the wire may be slid on the wire, but a rotating body engaging with the wire is attached to the lower surface of the main girder so that the main girder is guided and sent out by the rotation of the rotating body. (Claim 3).
With this configuration, the friction resistance between the wire and the main girder can be reduced and guided smoothly, and the directionality in the feeding direction can be ensured.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a girder feeding construction method according to claim 1 of the present invention, in which 1 is a steel main girder, 2 is a ground yard, 3 is a pier that is fixed upright in front of the ground yard, A crawler-type feed base 4 that supports the main girder 1 fed from the ground yard 2 is installed on the pier 3, and the crawler-type feed base 4 extends from the ground yard 2 to the front peer 3. A wire 5 is stretched through a guide member 6 at substantially the same height as the mounting surface (crawler surface).
[0012]
The guide member 6 that stretches the wire 5 is stretched and supported so that the tip end portion of the main girder 1 that is slidably guided on the wire 5 is smoothly transferred onto the crawler-type feed base 4 on the peer. A pulley is used as a member. And as the position which stretches the said wire 5, it is made into the inner side of the crawler type feed stand 4, or the outer side, and the both ends of the wire 5 stretched through the guide member 6 are respectively in the ground yard 2 or the pier 3 Fix it.
[0013]
The crawler type feed stand 4 installed on the upper surface of the pier 3 has a structure in which a machine body is supported upright by a vertical jack on a base plate, and an endless crawler is rotatably wound around the outer circumference of the machine body. Then, the crawler type feed base 4 is installed by placing the base plate on the upper surface of the pier 4, so that the crawler and the machine body for supporting the main girder 1 from the contact resistance between the base plate and the upper surface of the pier 3. Therefore, the crawler that supports and supports the main girder 1 by the pushing by the thrust of the rear carriage (not shown) and the pulling force of the pulling wire connected to the main girder act on the main girder 1. The main girder 1 is sequentially sent out and transferred by rotating around the machine body. The number of crawler type feed bases 4 installed on the upper surface of the pier 3 is determined according to the width of the main girder 1 to be installed. In addition, the vertical jacks constituting the crawler type feed base 4 and the horizontal jacks (not shown) for correcting the orientation of the machine body are computer-controlled in the vertical and horizontal angles and the height difference so that stable feeding can always be performed. . As a result, the height (gradient) and angle (curve) to be sent out are adjusted accurately, and the gigantic main girder is slid and sent out forward. The feed base 4 functions as a temporary support until the main girder 1 is supported by the saddle.
[0014]
Next, a method for sending out a bridge will be described.
First, the wire 5 is stretched from the ground yard 2 to the peer 3 located at the front position in the delivery direction of the main girder 1 at a height substantially the same as the crawler upper surface of the crawler type feed base 4 installed on the peer. Fix it. Then, the main girder 1 is assembled in the ground yard 2 and sent out on the rear carriage 8 mounted on the rail laid on the ground yard 2.
The rear carriage 8 can send out the main girder 1 by moving the front and rear clevis jacks and clamp jacks alternately and continuously. In order to reduce the frictional resistance (load) with the rail, four slide bases may be used in place of the wheel engaged with the rail.
[0015]
By the way, as the sending of the main girder 1 progresses, the leading end of the main girder 1 generally passes through the peer 3-1 on which the crawler type feed stand 4 near the ground yard 2 is installed, and the sending direction. It is sent out toward the next peer 3-2 located in front. As the feed increases, the leading part of the main girder 1 moves away from the fulcrum (feeding base 4 where the feeding is performed), so that the leading part of the main girder 1 bends downward and the bottom surface of the leading part of the main girder 1 Is positioned below the upper surface (crawler surface) of the feed table 4 on the peer 3-2, and even if the feeding is continued as it is, the front part of the main beam 1 is placed on the upper surface of the feed table 7 on the front peer 3-2. It does not reach and sending is impossible.
[0016]
However, the construction method of the present invention is such that the main girder 1 is stretched over the wire 5 that is stretched over the pier 3 positioned forward in the feed direction from the ground yard 2 to the same height as the crawler surface of the crawler type feed base 4. Therefore, the end of the main girder 1 is supported by the wire 5 to be bent downward, and is sent out in a substantially horizontal state.
Accordingly, the main girder 1 is supported at the lower side by the wire 5 as the tip approaches the next peer 3, and the lower surface of the main girder 1 is flush with the upper surface of the crawler type feed base 4 or the upper surface of the crawler type feed base 4. Positioned further upward, the leading portion of the main girder 1 is smoothly transferred onto the crawler feed base 4 and can be continuously fed out (see FIGS. 1A and 1B).
[0017]
FIG. 2 shows the equipment arrangement of the crawler type feed base 4 and the wire 5 on the peer that performs the above-mentioned feeding, and two sets of crawler type feed bases 4 are arranged on the peer 3 according to the width of the main girder 1. As shown, four sets are arranged in parallel at a predetermined interval. Then, four wires 5 are stretched substantially parallel to each other between a pair of feed bases 4 (see FIG. 3). A trajectory correcting device 7 is installed outside the crawler type feed base 4 in the width direction.
[0018]
FIG. 4 is an explanatory view showing a modified example of the delivery method. The same members as those shown in the above-described embodiment are given the same reference numerals, and the description thereof is omitted.
In the construction method described above, the wire 5 is stretched and fixed from the ground yard 2 to the pier 3 positioned forward in the feed direction, and the main girder 1 is fed by sliding on the wire 5. Therefore, in order to reduce the contact resistance between the wire 5 and the main girder 1 and to improve the directionality in the feeding direction, a sheave 9 is attached to the bottom surface of the main girder 1 and the sheave 9 is engaged with the wire 5. In addition, it is possible to improve the directionality of getting over the crawler type feed base 4 on the pier and the direction of delivery.
[0019]
In the above-described delivery method, the thrust for feeding the main girder 1 forward from the ground yard 2 is not limited to the method based on the alternating operation of the clevis jack and the clamp jack by the rear carriage described above. It ’s good. For example, a method of moving forward by pulling a wire fixed at the end of a peer that is the destination of sending out the main girder with a wire drawing device attached to the main girder, or connecting the wire to the tip of the main girder and sending out the wire Examples include a method of winding with a winch or a drum at the front position. Moreover, the method of using those methods in combination with the above-described rear carriage may be used.
[0020]
The form of supporting the main girder with the wire in the present invention is not limited to the form of directly supporting the lower surface of the main girder with the wire as in the previous embodiment, but indirectly with the wire abutting member separately attached to the main girder. It may be in the form of support.
The configuration will be briefly described with reference to FIG. 5. Wire abutting members 10, 10 ′ are fixed to both left and right side surfaces of the main girder 1 along the bridge axis direction by bolts and nuts 11. , 10 ′ is placed on the wire 5 for guidance. Reference numeral 12 denotes a guide member for preventing the wire 5 from being detached from the wire contact members 10 and 10 '. The same members as those shown in the previous embodiment are given the same reference numerals, and the description thereof is omitted.
[0021]
【The invention's effect】
According to the method for feeding and installing girders of the present invention, the method of claim 1 can be used to smoothly pierce and pierce a peer without connecting a handrail. Therefore, it is possible to reduce the cost required for the manufacture, installation, transportation and painting of hand-rollers, and the weight of the hand-roller is reduced, so that the girder is less reinforced and thrust is generated. Therefore, it is possible to obtain an effect such that the delivery device for the device can be a small one corresponding to the weight.
Further, according to the structure of the second aspect, the main girder can be stably supported and fed out.
Furthermore, according to the configuration of the third aspect, the friction resistance between the wire and the main girder can be reduced and the guide can be smoothly guided, and the directivity in the feeding direction can be ensured.
Therefore, it is possible to provide an erection method that enables continuous feeding without a hand-drawer.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram for explaining a construction method according to the present invention, in which (a) shows a state before transferring to a feed base on a peer, and (b) shows a state in which a main girder has transferred to a feed base on a peer. .
FIG. 2 is an enlarged perspective view showing a state in which a front portion of a main beam is in a state before reaching a peer.
FIG. 3 is an enlarged sectional view taken along line (3)-(3) in FIG.
FIG. 4 is an explanatory diagram for explaining a modification of the erection method of the present invention.
FIG. 5 is a cross-sectional view showing another example of main girder support by wires.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Main girder 2 ... Ground yard 3 ... Pier 4 ... Crawler type feed stand 5 ... Wire 9 ... Rotating body (sheave)

Claims (3)

When installing the main girder on the pier, a wire is stretched and fixed from the ground yard where the main girder is assembled to each peer located in front of it, and the main girder is sent out along the wire to reach It is a delivery construction method that guides and reaches the leading end of the main girder not connected to the machine on the feed stand on the peer ,
The wire is stretched and fixed so that the lower surface of the main girder on the wire reaches substantially the same height as the upper surface of the feed table when the wire reaches the feed table. Construction method.   2. The girder feeding construction method according to claim 1, wherein the wires stretched between the front piers from the ground yard are two parallel wires with a predetermined interval.   The girder delivery construction method according to claim 1 or 2, wherein the main girder delivered on the wire is guided and delivered via a rotating body engaged with the wire.

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