JP2018178572A - Launching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a launching method making it possible to deliver a bridge body in a low position even if a parapet of a bridge abutment exists at a launch destination.SOLUTION: A launching method which moves bridge bodies 2, 2, 2including a launching machine 1 attached thereto in a bridge axial direction, the method comprising the steps of: reattaching (S2) the launching machine 1 to a high position of the bridge body 2after the bridge body 2reaches a final span L while avoiding interference of the launching machine 1 with a parapet 4a of a bridge abutment 4 at the launch destination; and installing (S4) the bridge bodies 2, 2, 2to the bridge abutment 4 and bridge piers 5, 5in the launch destination by lowering them after the bridge bodies 2, 2, 2reach the bridge abutment 4 in the launch destination.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a delivery method for moving a bridge body attached with a hand spreader in the bridge axial direction.

  As a type of construction method of a bridge body, there is known a delivery method in which a bridge body attached with a hand spreader is moved in the bridge axial direction. The bridge body is sent out in a cantilever state by the delivery device in the span of the bridge pier. When the span is long, a large bending moment is generated in the bridge before the bridge reaches the previous bridge, which may cause the bridge to be deformed or broken. In order to prevent this, attach a hand lighter that is lighter than the bridge at the end of the bridge, and send it out so that the hand can reach the bridge first, and then send the hand and bridge in a double-held state A delivery method using a hand spreader is adopted (see Patent Document 1).

Unexamined-Japanese-Patent No. 2016-108771

  However, in the delivery method using the conventional hand spreader, when the parapet is constructed on the abutment, there is a problem that the hand spreader needs to be delivered at a high position to avoid the parapet. The same applies when the existing girder is installed on the bridge pier.

That is, as shown in FIG. 3, first, as Okuridaseru the Tenobeki 11 at a high position, above the abutment 12 and the abutment ₁₃ 1, 13 _2, placed bearing, delivery device, the equipment 14 of the gantry such . The delivery device by Tenobeki 11 and Hashitai ₁₅ 1, 15 sends ₂ at a high position avoiding the parapet 12a a (S1). After the bridge body 15 ₁ reaches the abutment 12 (S 2), the hand spreader 11 is removed, and the bridge bodies 15 ₁ , 15 ₂ and 15 ₃ are used as the abutment 12 and the bridge pier 13 ₁ by a jack down method using hydraulic jacks and the like. , installed in 13 ₂ (S3).

If the height of the parapet 12a of abutment 12 is high, resulting in feeding the pier ₁₃ 1, 13 hand caster 11 and Hashitai ₁₅ 1 ₂ For example, in a high position above 5 _m, 15 2, 15 _3. In this case, bearing on the abutment 12 and the abutment ₁₃ 1, 13 _2, delivery device, it is necessary to large-scale equipment of the gantry, and the like. In particular, when installing equipment on a bridge pier in a river apart from the land area, the working radius of the crane becomes large, and a large heavy equipment is required. Furthermore, since the bridge bodies 15 ₁ , 15 ₂ and 15 ₃ are lowered little by little, for example, 10 to 15 cm each for the bridge piers 13 ₁ and 13 ₂ by the jack down method, it takes time and effort and time for the descent work.

  Therefore, an object of the present invention is to provide a delivery method capable of delivering the bridge at a low position even if there are obstacles such as parapet of the abutment and existing girder on the pier at the delivery destination.

  In order to solve the above-mentioned subject, in the sending out method which moves the bridge which attached the hand spreader in the direction of the bridge axis in the present invention, after the bridge reaches the final diameter, the hand spreads out the sending destination. Attaching the hand spreader to a high position of the bridge so as not to interfere with the obstacle of the bridge or bridge pier, and after the bridge reaches the bridge or bridge pier of the delivery destination, the bridge And d) and placing on the abutment or the bridge pier at the delivery destination.

  According to the present invention, even if there are obstacles such as parapets and existing girders at the delivery destination, the bridge body can be delivered at a low position. As a result, the facilities on the abutments and piers can be reduced, and the descent work of the bridge can be significantly reduced. In addition, since the bridge can be delivered at a low position, the delivery method is extremely high in safety.

It is process drawing of the delivery method of one Embodiment of this invention. It is a figure showing a sending out yard. It is process drawing of the conventional delivery method.

  The delivery method of the embodiment of the present invention will be described below with reference to the attached drawings. However, the delivery method of the present invention can be embodied in various forms, and is not limited to the embodiments described in the specification. This embodiment is provided with the intention to enable a person skilled in the art to fully understand the scope of the invention by making the disclosure of the specification sufficient.

FIG. 1 shows a process diagram of a delivery method according to an embodiment of the present invention. Reference numeral 1 denotes a hand-rolling machine, 2 ₁ , 2 ₂ and 2 _{3 3} are joined bridges, 3 is a connection structure, 4 is a delivery destination abutment, and 5 ₁ and 5 ₂ are bridges. The abutment 4 is provided with a parapet 4a which becomes an obstacle when feeding low. On the upper surface of Hashitai 2 _1, in advance bracket 6 is attached.

As shown in S1, attaching a hand caster 1 through Hashitai 2 _1, 2 ₂ of the previously continuous fine 3, toward the left Tenobeki 1 and Hashitai 2 _1, 2 ₂ from right Figure 1 Send out. Abutments and piers are pre-installed with equipment such as bearings, delivery devices and mounts. These facilities may be installed by the crane installed in the land part, and may be installed by the crane installed in the hand extension machine 1. Tenobeki 1 and Hashitai ₂ 1, _{2 2,} Tenobeki 1 is fed at a low position so as to interfere with the parapet 4a. Because of this, these facilities can be minimized.

  For the support and delivery device, for example, one to move a vertical jack (bearing) and a push-pull horizontal jack (delivery device) alternately like a scale insect, move the bridge body by a combination of a horizontal jack and a sliding block, vertical It is possible to use a delivery device with a sliding block, a caterpillar delivery device, and the like which are refilled with a jack.

As shown in S1, Hashitai 2 ₁ final span L, that when it reaches the one before the pier 5 ₁ of abutment 4, to stop the delivery. In this embodiment, Hashitai 2 ₁ reaches the final span L, more when Tenobe machine 1 reaches the abutment 4, to stop the delivery. Then, as shown in S2, remove the Tenobeki 1 from Hashitai 2 _1, Tenobeki 1 reinstalled in a higher position to Tenobe machine 1 of Hashitai 2 ₁ so as not to interfere with the abutment 4. On the upper surface of Hashitai 2 _1, the bracket 6 for attaching the Tenobeki 1 at a higher position is attached. The hand spreader 1 is attached to the bracket 6 via the connecting structure 3. Bridge member 2 ₁ side end of Tenobeki 1 is lifted by lifting apparatus such as jacking hoist (not shown). One end of the abutment 4 side of the hand drawing machine 1 is lifted by a crane 7 installed near the abutment 4. Since the vicinity of the abutment 4 is a land section, the crane 7 can be easily disposed. Alternatively, it may be jacked up by a hydraulic jack installed on the abutment 4.

As shown in S 3, using the delivery device, the hand spreader 1 and the bridge bodies 2 ₁ , 2 ₂ and 2 ₃ reattached to the high position are sent out from the right to the left in FIG. By reattaching the hand drafting machine 1 to a high position, the hand drafting machine 1 is made to have the same function as the setting beam, that is, the hand drafting machine 1 while keeping the bridges 2 ₁ , 2 ₂ and 2 ₃ at a low position. Can create the state temporarily received by the abutment 4. In addition, 6a of the bracket 6 shows the supporting structure to which a compression load is applied, and 6b shows the rigid connection or pin connection to which a tension load is applied. The load on the bracket 6 is similar to that of the setting beam.

As shown in S3, when the hand unit 1 passes the abutment 4, the pasted portion of the hand unit 1 is removed. As shown in S4, Hashitai 2 ₁ when it reaches the abutment 4, stop feeding, Tenobeki 1, to remove the bracket 6. Then, the bridge bodies 2 ₁ , 2 ₂ and 2 ₃ are lowered by the jack down method, and the bridge bodies 2 ₁ , 2 ₂ and 2 ₃ are installed on the bridge 4 and the bridge piers 5 ₁ and 5 ₂ . The amount of descent is, for example, 70 cm to 1 m, as it is sufficient for the delivery device and the minimum required mount.

FIG. 2 shows the delivery yard 9 when there are parapets 8a at the abutment 8 on the departure side. If the departure side abutment 8 has parapets 8a, the delivery yard 9 is disposed between the departure side abutment 8 and the first abutment 5 _n in this embodiment, than the departure side abutment 8 . Then, Hashitai 2 ₁ so as not to interfere with parapets 8a, joining the bridge member 2 ₁ feed yard 9. Are rails on the feed yard 9 cradle installation, the rail traveling truck 10 is provided to be run to support the Hashitai 2 _1.

According to the delivery method of the present embodiment, the following effects can be obtained. Even if there are parapets 4a in the abutment 4 of the delivery destination, the bridges 2 ₁ , 2 ₂ and 2 ₃ can be delivered at a low position, so the facilities on the abutment 4 and the bridge piers 5 ₁ and 5 ₂ can be reduced. The descent work of the body 2 ₁ 2 ₂ 2 ₃ is also greatly reduced. In addition, since the bridge bodies 2 ₁ , 2 ₂ and 2 ₃ can be delivered at low positions, a delivery method with extremely high safety can be obtained.

After Tenobeki 1 reaches the abutment 4 destination delivery, since reseated Tenobeki 1 at a high position of Hashitai 2 _1, operation is easy to be reseated Tenobeki 1.

Since the upper surface of Hashitai 2 ₁ provided setting beam similar bracket 6, it is easy to work to be reseated Tenobeki 1.

A delivery yard 9 is provided on the delivery side of the departure side abutment 8 and the bridges 2 ₁ , 2 ₂ and 2 ₃ are joined by the delivery yard 9, so even if there are parapets 8 a on the departure side abutment 2 the bridge 2 _{1, 2} 2, _{2 3} can be fed to a low position.

  The present invention is not limited to being embodied in the above embodiment, and can be changed to other embodiments within the scope of the present invention.

  Although the said embodiment demonstrated the example whose obstacle is the parapet of a bridge body, an obstacle may be the existing girder on an abutment or a pier.

  In the above-described embodiment, after the hand spreader reaches the delivery destination abutment, it is remounted at a high position, but before the hand spreader reaches the delivery destination abutment, the height position of the hand spreader is high It is also possible to reattach it.

  If there is no obstacle such as parapet on the departure side abutment, the bridge body can also be sent out from the back side of the departure side abutment.

  In the above embodiment, the hand spreader is removed from the bridge and the hand spreader is attached to the bracket of the bridge again. However, the hand spreader is provided on the bridge so as to be vertically slidable, and the hand spreader is bridged It can also be reinstalled at a high position of

  It is also possible to arrange a temporary support leg between the delivery destination abutment and the bridge pier one ahead. In this case, the final span is between the abutment and the temporary support leg of the delivery destination.

  In the case of a bridge with a large diameter, depending on the local conditions, the location of the delivery yard is not necessarily near the abutment. For example, the delivery yard can be disposed between the eighth and ninth piers.

DESCRIPTION OF SYMBOLS 1 ... Hand-rolled machine 2 ₁ , 2 ₂ , 2 ₃ ... Bridge body 4 ... Abutment 4 a ... Parapet 5 ₁ , 5 ₂ , 5 _n ... Pier 5 _n ... 1st pier 6 ... Bracket 8 ... Abutment 8 a ... Parapet 9 ... Delivery yard L ... Last span

Claims (5)

In the delivery method, in which the bridge body with the hand spreader attached is moved in the bridge axial direction,
Reattaching the spreader to a high position of the bridge so that the spreader does not interfere with the obstacle of the abutment or the bridge after the bridge reaches the final span;
A step of lowering the bridge body after the bridge body reaches the abutment or the bridge pier of the delivery destination, and installing the bridge body on the abutment or the bridge pier of the delivery destination.   The delivery method according to claim 1, wherein after the hand spreader reaches the abutment or the bridge pier at the delivery destination, the hand spreader is reattached to the high position of the bridge.   The delivery method according to claim 1 or 2, wherein a bracket is provided on the upper surface of the bridge for reattaching the hand spreader to the high position. Set up a delivery yard on the delivery side of the starting abutment or pier on the obstacle side,
The delivery method according to any one of claims 1 to 3, wherein the bridge is joined by the delivery yard.   The delivery method according to any one of claims 1 to 4, wherein the obstacle is a parapet of the abutment, or an existing girder on the abutment or the bridge pier.

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