JP2011069162A - Delivery method for mono-chord lohse bridge girder member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a delivery method for a mono-chord Lohse bridge girder member, which equalizes front truck reactions in delivery to reduce truck and rail girder facilities. <P>SOLUTION: In the delivery method for the mono-chord Lohse bridge girder member, delivery trucks (a front truck 11 and a rear truck 12) placing a mono-chord Lohse bridge girder member RH with a launching machine T mounted to one end are allowed to travel to lay a bridge girder from a first bridge pier P2 to a second bridge pier P1. When delivering the mono-chord Lohse bridge girder member RH, the front truck 11 is located below the launching machine T. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a single string rose bridge member delivery method that spans from a first pier to a second pier by running a delivery carriage on which a single string rose bridge member having a hand stretcher attached at one end is placed. Is.

In the arch bridge, in addition to the arch member, a member for securing a road surface is provided. There is a form in which this member is provided with rigidity, and the bridge is configured by sharing the force with the arch member. This is called a stiffening arch bridge, and a member having rigidity is called a stiffening girder.
The Rose Bridge is a stiffening arch bridge that shares the bending moment between both the stiffening girder and the arch member. The arch member and the stiffening girder have approximately the same member thickness.
A single-string Rose bridge, which is a Rose Bridge and has only one arch member installed at the center line position of the bridge girder, is called a single-string Rose bridge.
The single string rose bridge is described in Patent Documents 1 and 2. Patent Document 1 describes an arch bridge in which an arch rib as an arch member is bridged on an upper road of a bridge floor. A structure for reducing the weight of the arch bridge by supporting a horizontal load applied to the arch rib with a tie material is described.
Further, Patent Document 2 discloses a bridge erection method in which a bridge girder including an arch bridge is lifted after being built between bridge piers, and ends of the bridge girder are joined to both sides of the bridge girder after the lifting process. Are listed.

JP 2004-232296 A JP 2004-162330 A JP 2003-278114 A

However, the conventional technique has the following problems.
Patent Document 1 does not describe a construction method.
The technique of Patent Document 2 has a drawback in that since the ground construction is performed locally, in the case of a bridge over a road or a railway, traffic must be stopped for a long time.
Patent Document 3 describes an ordinary girder bridge feeding method, and describes a configuration in which grounding is performed only at both ends of the bridge.

However, when the single string Rose bridge girder member is to be installed by the delivery method described in Patent Document 3, there are the following problems. FIG. 5 shows a configuration diagram of the delivery method of the single string rose bridge girder member RH as an embodiment. FIG. 6 shows a cross-sectional view of the front carriage 11 of FIG.
The single string Rose bridge girder RH is composed of a straight bridge girder member H, a single string arch rib R, and a plurality of column members E that connect the bridge girder member H and the arch rib R. A bridge T is connected to the bridge girder H via a connecting structure F.
On the other hand, linear rail equipment 13 is provided on the plurality of vents B3 to B12, and eight front carriages 11 and eight rear carriages 12 can travel on the rail equipment. Is provided. The front carriage 11 is a self-propelled type, and the rear carriage 12 is a follower type. A bridge girder member H is placed on the front carriage 11 and the rear carriage 12.

When the front carriage 11 and the rear carriage 12 move forward, it is necessary for the leading end of the hand extender T to reach the vent B1, so that the hand extender T extends long forward as shown in FIG. Here, as shown in FIG. 6, the main girder of the single string rose bridge girder member RH is composed of three main girders G1, G2, and G3. The main girder G1 is mainly supported by two rail girder carriages 11 (G1). The main girder G2 is mainly supported by two rail girder carriages 11 (G2). The main girder G3 is mainly supported by two rail girder carriages 11 (G3). Here, six carriages of rail girder carriages 11 (G 1), 11 (G 2), and 11 (G 3) constitute the front carriage 11.
At the leading end of the main girder, a girder is attached. Until the leading end of the girder reaches the second pier P1 (bent B1), the G2 girder girder is a G1 girder or G3 girder hand depending on the weight of the arch rib. The amount of wrinkles is larger than that of the machine. In order to eliminate the difference in the amount of wrinkles, the G1 digit, G2 digit, and G3 digit billing machines are connected with a 10-m pitch horizontal girder.
Since the hand extender T extends long forward, a large moment is applied to the single string Rose bridge girder member RH as shown in FIG. The bending moment diagram of FIG. 7 shows the magnitude of the bending moment applied to the bridge girder member H.
The clockwise moment (negative moment) generated by the hand extender T gradually increases, but rapidly decreases after the end RS of the arch rib R.
This is because the bending moment becomes an axial force (18,000 kN pulling force) acting on the arch rib.

In other words, the arch rib R has the maximum moment Mmax generated by the three hand stretchers at the distal end portion RS as the axial force of the arch rib R. The tensile axial force of the arch rib R acts on the G2 girder via the column material E1, and almost 100% of the reaction force of the front carriage is loaded on the G2 girder, which is the central girder, and the rail girder carriage 11 that supports the G2 girder 11 (G2) receives an excessive reaction force.
Here, in order to equalize the reaction force in the three main girders G1, G2, and G3, temporary reinforcement members K1 and K2 (for example, 53 ton reinforcement members) from the bridge girder member H on both sides of the single-string arch rib R are provided. It is possible to install. However, even in this case, the non-uniformity is slightly corrected, but the reaction force of the rail girder carriage 11 (G2) is still about 700 tons in the G2 digit, and the rail girder carriage 11 (G1) in the G1 and G3 digits. , 11 (G3) has a reaction force of about 200 tons, and there is a problem that the general-purpose cart and the general-purpose rail girder cannot be used as the rail girder cart 11 (G2).
Moreover, it was necessary to reinforce the bridge girder member H in order to attach the temporary reinforcing members K1 and K2 (in one example, a reinforcing material of 30 tons). And these temporary reinforcement materials K1 and K2 need to be removed after completion of the construction.
As described above, using the temporary reinforcing materials K1 and K2 causes many cost increases such as the production cost of the special carriage and the special rail girder, the manufacturing cost of the temporary reinforcing material, the installation work cost, and the removal work cost. There was a problem.

  An object of the present invention is to provide a single-string rose bridge girder member feeding method capable of solving the above-described problems and reducing the reinforcement of arch ribs.

The single string rose bridge girder member feeding method according to the present invention has the following configuration.
(1) In a single-string Rose bridge girder member delivery method that runs from a first pier to a second pier by running a delivery carriage on which a single-string rose bridge girder with a hand stretcher attached at one end is run, When delivering a single string Rose bridge girder member, the delivery carriage is located under the billing machine.
(2) In the single-string rose bridge girder member feeding method described in (1), the length of the hand stretcher before the front carriage is longer than the distance between the first pier and the second pier. Features.
In addition, the G2 girder spreader is less affected by the arch rib weight until the end of the girder reaches the second pier, so there is a large difference in the amount of warpage between the G1, G2 and G3 girder. Therefore, there is no need to connect the G1, G2, and G3 digits with horizontal digits.

Next, the operation and effect of the single string rose bridge girder member delivery method having the above-described configuration will be described.
(1) A single string rose that bridges from the first pier to the second pier by running a delivery carriage (front carriage and rear carriage) on which a single string rose bridge girder member with a hand stretcher attached at one end is placed. In the bridge girder member delivery method, when the single string rose bridge girder member is delivered, the front carriage is located under the handbill, so that the axial force of the arch rib generated by the G2 girder However, when acting as a tensile force, the compressive force acting on the arch rib due to the weight of the Rose bridge is greater, so the compressive force acts on the arch rib instead of the tensile force. In this case, the stress balance is the same as in the completed system, and the front truck reaction force is equalized to about 300 tons for the G1 to G3 digits. Therefore, it is possible to use general-purpose machines as carts and cart rail girders. Cost can be reduced. Moreover, since it is not necessary to install a construction reinforcing material on the arch rib, it is possible to reduce the manufacturing cost, attachment work cost, removal work cost, etc. of the temporary reinforcement material.

(2) In the single string rose bridge girder member feeding method described in (1), the length of the hand stretcher before the front carriage is a predetermined length from the distance between the first pier and the second pier. Since the front carriage is located behind the first pier, the tip part of the handrail reaches the second pier, so the front carriage is moved backward, The single-string Rose bridge girder can continue to be delivered.

It is a 1st process drawing of the delivery method of the single string rose bridge girder member RH of the present invention. It is a 2nd process drawing. It is sectional drawing in the position of the front trolley | bogie 11 of FIG. It is a figure which shows the magnitude | size of the moment concerning a bridge girder member H in the state of FIG. It is a block diagram of the delivery method of the single string rose bridge girder member RH. It is sectional drawing in the front trolley | bogie 11 of FIG. It is a figure which shows the magnitude | size of the moment concerning a bridge girder member H in the state of FIG.

A single string rose bridge girder member RH delivery method according to an embodiment of the present invention will be described in detail with reference to the drawings.
In FIG. 1, the block diagram of the delivery method of the single string rose bridge girder member RH is shown. FIG. 3 shows a cross-sectional view at the position of the front carriage 11 of FIG.
The single string rose bridge girder RH is composed of a straight bridge girder member H, a single string arch rib R provided at the center position of the bridge girder member H, and a plurality of column members E connecting the bridge girder member H and the arch rib R. ing. A handrail T is connected to the bridge girder H via a connecting structure F. The length before the front carriage of the bill extender T is made longer than that of a conventional bill extender. This will be described later.

In the present embodiment, a linear rail facility 13 is provided on the plurality of vents B3 to B14. As shown in FIG. 3, the rail installation 13 has eight rows of rails 13a, and each of the eight front carriages 11 is installed on each rail 13a so that it can run. A carriage upper beam 14 is bridged over the eight front carriages 11, and three handrails T 1, T 2, T 3 are placed on the carriage upper beam 14. Three extension machines T1, T2, T3 are used as extensions of the main beams G1, G2, G3.
As a result, the eight front carriages 11 are simultaneously moved by the same distance. The same applies to the rear carriage 12. The eight front carriages 11 are self-propelled, and the eight rear carriages 12 are follower.

  A pier P1 (corresponding to a second pier in claims) and a pier P2 (corresponding to a first pier in claims) are installed in front of the vent B3. A vent B1 is installed in the vicinity of the pier P1. In the vent B1, the delivery device BR1 is fixed on the sanddle BB1 on the vent. Similarly, a vent B2 is installed in the vicinity of the pier P2. In the vent B2, a jack BJ2 is fixed on the sanddle BB2 on the vent. On the delivery device BR1, the hand extenders T1, T2, T3 are supported.

As shown in FIG. 1, the front carriage 11 supports the rear portions of the hand extenders T1, T2, and T3. The rear carriage 12 supports the vicinity of the rear end portion of the bridge girder member H.
FIG. 2 shows a state where the front carriage 11 is driven and self-propelled and has come to the vicinity of the vent B3. In this state, the leading ends of the hand extenders T1, T2, and T3 are supported on the delivery device BR1 of the vent B1. Further, the rear portions of the hand extenders T 1, T 2, T 3 are supported on the front carriage 11.
In the state shown in FIG. 2, that is, when the eight front carriages 11 on which the manual delivery machines T1, T2, and T3 are placed right above are in the vicinity of the vent B3, the manual delivery machines T1, T2, and T3 The leading ends of the hand delivery machines T1, T2, T3 have a length that is reliably supported on the delivery device BR1 of the vent B1.

The eight front trolleys 11 are not positioned below the bridge girder member H, but the front trolley 11 is positioned below the spreaders T1, T2, T3, and the front trolley 11 is moved to the spreaders T1, T2, T3. The reason for this is to prevent an excessive tensile axial force from acting on the arch rib R.
FIG. 4 shows a bending moment diagram applied to the bridge girder member H in the state of FIG. The upper side of the reference line indicates a clockwise negative moment, and the lower side of the reference line indicates a counterclockwise positive moment.
The bending moment sequentially increases up to the position of the front carriage 11 located below the hand-rolling machines T1, T2, and T3, reaches the maximum moment Mmax at the position of the front carriage 11, and then decreases sequentially.
And the magnitude | size of the bending moment in the front-end | tip part RS of the bridge girder member H is Ms.
On the other hand, as an axial force acting on the arch rib R due to the weight of the Rose bridge, a compressive force (in one example, a compressive force of 6300 kN) acts.

  Since the stress balance is the same as in the completed system, the reaction forces of the rail girder trucks 11 (G1), 11 (G2), and 11 (G3), which are the front carriages 11, are almost equalized. As a girder, general-purpose equipment can be used, and the cost of manufacturing a special carriage and a carriage rail girder can be reduced. In addition, since it is not necessary to install an erection reinforcing material on the arch rib R, it is possible to reduce the manufacturing cost, attachment work cost, removal work cost, etc. of the temporary reinforcement material.

As explained in detail above, by running a delivery carriage (front carriage 11 and rear carriage 12) on which a single-string Rose bridge girder member RH having a hand stretcher T1, T2, T3 attached at one end is placed, In the single string rose bridge girder member delivery method that spans from the first pier P2 to the second pier P1, when the single string rose bridge girder member RH is delivered, the front carriage 11 is under the hand stretchers T1, T2, T3. Since the axial force of the arch rib R generated by the hand extender T2 acts as a tensile force, the compression axial force generated in the arch rib R due to the weight of the single-string Rose bridge is larger. Therefore, as an axial force of the arch rib R, not a tensile force but a compressive force acts. In this case, since the stress balance is the same as in the completed system, the reaction force of the rail girder trucks 11 (G1), 11 (G2), and 11 (G3) that are the front carriage 11 is equalized to about 300 tons. General-purpose equipment can be used as the truck track girder, and the cost of manufacturing a special truck rail girder can be reduced. Moreover, the cart itself can use the general-purpose cart as it is.
In addition, since it is not necessary to install an erection reinforcing material on the arch rib R, it is possible to reduce the manufacturing cost, attachment work cost, removal work cost, etc. of the temporary reinforcement material.

  Moreover, since the length before the front trolley | bogie of hand-roller T1, T2, T3 is longer than the distance of the 1st pier P2 and the 2nd pier P1, the front trolley | bogie 11 is the 1st pier P2. Even if it is located at the rear, the leading end portions of the hand extenders T1, T2, and T3 reach the second pier P1, and then the front carriage 11 is moved rearward, and again, the single-string Rose bridge girder member RH Sending can be continued.

As mentioned above, although the Example was shown about the delivery method of the bridge girder member which concerns on this invention, this invention is not limited to this Example, A various change is possible in the range which does not deviate from the meaning.
For example, in the present embodiment, the case where there are three hand-rolling machines T1, T2, and T3 has been described, but the same is true for four or five hand-rolling machines.

RH Single-string Rose Bridge Girder R Arch Rib RS Tip T1, T2, T3 Extender P1 Second Pier P2 First Pier 11 Front Carriage 11 (G1) Front Carriage 11 (G2) Supporting G1 Girder G2 Girder Front cart 11 (G3) Front cart 12 that supports G3 girder Rear cart

Claims (2)

In a single string rose bridge girder member delivery method that runs from the first pier to the second pier by running a delivery carriage on which a single string rose bridge girder with a hand stretcher attached at one end is run,
The single string rose bridge girder member delivery method, wherein when the single string rose bridge girder member is delivered, the delivery carriage is positioned below the hand extender. In the single string rose bridge girder member feeding method according to claim 1,
The single string rose bridge girder member feeding method characterized in that the length of the hand stretcher before the front carriage is longer than the distance between the first pier and the second pier.

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