Hand-operated projecting machine and bridge construction method

Abstract

The present invention provides a launching machine and bridge erection method that can easily avoid interference with bridge piers when using the launching method. [Solution] A hand-launching machine 1 is attached to the leading end of a bridge girder 2 that is launched in the direction of the bridge axis and is launched together with the bridge girder 2, comprising a main body portion 11 that extends in the direction of the bridge axis, and a projection portion 12 that protrudes further to the leading end than the main body portion 11 and is positioned on the upper part of the main body portion 11, wherein the projection portion 12 is temporarily supported on the bridge pier 3 at the launching destination.

Description

Technical Field

[0001] The present invention relates to a stretching machine and a bridge erection method.

Background Art

[0002] Conventionally, when erecting a bridge girder on a pier, a method called the bent method is used. In the bent method, a bent assembly process, a bridge girder erection process, a bridge girder connection process, and a bent disassembly process are performed. That is, in the bent method, a bent is assembled at the planned installation position of the bent using a mobile crane, and after the bridge girders are connected on the bent, the bent is disassembled at the installation position of the bent using the mobile crane again. However, at a site with a railway line, a river, etc., it is impossible to place a bent or a crane, and the bent method cannot be adopted.

[0003] Therefore, a feeding method is used in which a ground-assembled bridge girder and a stretching machine connected to the tip of the bridge girder are sequentially bridged over the pier while being fed in the bridge axis direction (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the launching method, the launching machine connected to the tip flexes under its own weight, and reaches the bridge pier with the tip displaced downwards. This means that the height of the launching machine at the destination is lower than when it was launched, which can cause interference with the bridge pier at the launching point. To prevent this, a temporary support platform such as a bent is installed just in front of the bridge pier, and jacks or other devices placed on the temporary support platform are used to displace the tip of the launching machine upwards, thereby avoiding interference between the launching machine and the bridge pier. However, this method presents problems such as the complexity and time-consuming nature of installing and dismantling the temporary support platform.

[0006] This invention was made to solve the above problems, and aims to provide a launching machine and a bridge erection method that can easily avoid interference with bridge piers when performing the launching method. [Means for solving the problem]

[0007] To solve the aforementioned problems, the present invention provides a hand-launching machine that is attached to the leading end of a bridge girder being launched in the bridge axis direction and is launched together with the bridge girder, comprising: a main body extending in the bridge axis direction; and a projection on the leading end of the main body that protrudes further to the leading end than the main body and is positioned on the upper part of the main body, wherein the projection is temporarily supported on a bridge pier or bent at the launching destination.

[0008] Furthermore, the present invention relates to a bridge erection method using a launching machine attached to the leading edge of a bridge girder that is launched in the direction of the bridge axis, and which is launched together with the bridge girder, comprising: a launching machine having a main body extending in the direction of the bridge axis and a projection that protrudes further toward the leading edge than the main body and is positioned on the upper part of the main body; a connecting step of connecting the launching machine with the bridge girder; a launching step of launching the launching machine together with the bridge girder toward a bridge pier; a temporary support step of temporarily supporting the projection of the launching machine on the bridge pier; a height adjustment step of raising the projection on the bridge pier to adjust its height and supporting the projection via a support member; and a main body support step of further launching the bridge girder and the launching machine in the direction of the bridge axis and supporting the main body on the bridge pier.

[0009] According to the present invention, a projection is provided that protrudes from the main body towards the tip and is positioned on the upper part of the main body. In other words, because the projection is formed above and in front of the main body, even if the launching machine bends under its own weight and the tip of the launching machine is displaced downward, the projection can reach the bridge pier while maintaining a position higher than the bridge pier. This makes it possible to jack up the projection on the bridge pier, and interference between the launching machine and the bridge pier can be easily avoided without preparing a temporary support such as a bent.

[0010] Furthermore, it is preferable that the protruding portion includes an overhang that extends perpendicular to the bridge axis from the main body portion, and that the overhang is supported on the bridge pier via a support member.

[0011] Furthermore, the protruding portion is preferably provided with an overhang that extends perpendicular to the bridge axis from the main body, and in the height adjustment process, the overhang is preferably supported on the bridge pier via the support member.

[0012] According to the present invention, by providing an overhanging portion, the protruding portion can be supported outside the main body in the direction perpendicular to the bridge axis, preventing interference between the main body and the support member as they are fed from the rear. As a result, the hand-operated machine can be fed in the direction of the bridge axis without dismantling the support member, enabling continuous construction. [Effects of the Invention]

[0013] The present invention provides a launching machine and bridge erection method that can easily avoid interference with bridge piers when performing the launching method. [Brief explanation of the drawing]

[0014] [Figure 1] This is a side view showing a hand-operated machine according to the first embodiment of the present invention. [Figure 2] This is a side view showing the tip of a hand-operated canning machine. [Figure 3]This is a side view showing the hand-operated canister in a jacked-up position. [Figure 4] This is a front view showing the tip side of the hand-operated machine. [Figure 5] This is a side view showing the hand-operated launching machine extended in the direction of the bridge axis. [Figure 6] This diagram illustrates the bridge erection method of the present invention, where (a) is a diagram of the connection process, (b) is a diagram of the launching process, (c) is a diagram of the height adjustment process, (d) is a diagram of the launching process when the bridge is launched to the next pier, (e) is a diagram of the height adjustment process when the bridge is launched to the next pier, and (f) is a diagram of the main body support process when the bridge is launched to the next pier. [Figure 7] This diagram shows a conventional launching method, where (a) is a diagram of the connection process, (b) is a diagram of the launching machine being launched toward the bridge pier, (c) is a diagram of adjusting the height using temporary venting equipment, (d) is a diagram showing the launching machine being launched toward the next bridge pier, (e) is a diagram showing the launching machine being launched toward the next bridge pier with its height adjusted using temporary venting equipment, and (f) is a diagram showing the main body being supported when it is launched toward the next bridge pier. [Figure 8] This is a side view showing a hand-operated machine according to a second embodiment of the present invention. [Figure 9] This is a front view showing a hand-operated machine according to a second embodiment of the present invention.

[0015] <First Embodiment> A projection machine and a bridge erection method according to embodiments of the present invention will be described in detail with reference to the drawings. Descriptions and reference numerals may be omitted for redundant components.

[0016] As shown in Figure 1, the launching machine 1 is attached to the leading end of the bridge girder 2, which is being launched in the direction of the bridge axis. The launching machine 1 is launched together with the bridge girder 2 and its leading end is supported by the bridge pier 3 at the destination. After the launching machine 1 reaches the bridge pier 3, the final destination, it is dismantled from the leading end as needed. Note that the phrase "temporarily supported on the bridge pier at the launch destination" in the claim includes not only the bridge pier but also the bent.

[0017] The bridge girder 2 is an element that forms a bridge by connecting multiple of them. A stretching machine 1 is attached to the tip of the bridge girder 2, and each bridge girder 2 is sequentially connected on the delivery yard 4. Rails (not shown) are laid on the delivery yard 4, and a carriage 5 that moves on the rails is arranged. The carriage 5 of this embodiment is a self-propelled carriage on the rails, but it may also be a towed carriage that travels by receiving power from another source. By arranging the stretching machine 1 and the bridge girder 2 on the carriage 5, it can be sent out in the bridge axis direction.

[0018] As shown in FIGS. 3 and 4, equipment such as a support part 6 and a delivery device 20 is installed on the pier 3. The support part 6 includes a support 6a that supports the bridge girder 2, a pedestal 6b on which the delivery device 20 is placed, and a pedestal receiving part 6c on which the pedestal 6b is placed. The delivery device 20 is a device that can send out the stretching machine 1 in the bridge axis direction while supporting the lower part of the stretching machine 1. For the delivery device 20, for example, a caterpillar-type delivery device or the like can be used.

[0019] (Stretching machine 1) As shown in FIGS. 2 to 4, the stretching machine 1 includes a main body part 11 and a protruding part 12. The main body part 11 has a truss structure including a pair of upper chord members 11a, 11a arranged at intervals in a direction perpendicular to the bridge axis, a pair of lower chord members 11b, 11b arranged at intervals in a direction perpendicular to the bridge axis, and truss members 11c that connect the pair of upper chord members 11a, 11a and the pair of lower chord members 11b, 11b respectively. The upper chord member 11a and the lower chord member 11b are, for example, H-shaped steel or I-shaped steel.

[0020] As shown in FIG. 2, the protruding part 12 is arranged above the main body part 11 on the tip side of the main body part 11 and is a part that protrudes more on the tip side than the main body part 11. The protruding part 12 has the role of being jacked up by the equipment on the pier 3 to be displaced upward and eliminating the downward displacement of the stretching machine 1. In this embodiment, the protruding part 12 is provided by overlapping a part of the truss at the tip of the main body part 11.

[0021] The projection 12 has the same structure as the main body 11. That is, it is a truss structure in which the upper chord 12a and lower chord 12b are connected by a truss member 12c. The lower chord 12b of the projection 12 may be connected to the upper chord 11a of the main body 11 in any way, but in this embodiment, it is connected by a high-strength bolt joint. Reinforcing members may be provided to connect the main body 11 and the projection 12 to increase the connection strength between the main body 11 and the projection 12. The height and length of the projection 12 can be set as appropriate, but in this embodiment, considering the weight reduction of the tip portion of the hand projector 1, the height of the projection 12 is formed to be smaller than the height of the main body 11. Note that the main body 11 and the projection 12 are not limited to the structure described above and may have other structures.

[0022] As shown in Figure 4, the projection 12 is equipped with cantilevered portions 13, 13 that protrude from both ends in the direction perpendicular to the bridge axis. In other words, the cantilevered portions 13 extend further than the main body 11 in the direction perpendicular to the bridge axis and are supported on the bridge pier 3 via the sandle 30. The structure of the cantilevered portions 13 is generally the same as the truss structure of the projection 12. Note that if the projection 12 is supported on the bridge pier 3 by the sandle 30, the cantilevered portions 13 may be omitted.

[0023] The size and length of each component of the projection machine 1 can be set as appropriate according to the site. For example, if the width of the bridge pier 3 in the bridge axis direction is approximately 3m, the height of the main body 11 is approximately 2.5m, the length of the projection 12 in the bridge axis direction is approximately 5-6m, and the height is approximately 1.5m.

[0024] (Bridge construction method) Next, the bridge erection method according to this embodiment will be described with reference to Figures 1 to 7. As shown in Figure 6, in this embodiment, a first step and a second step are performed. The first step is the step of erecting the bridge between the first pier 3 and the second pier 3 as viewed from the launching yard 4. The second step is the step of erecting the bridge between the second pier 3 and the third pier 3 as viewed from the launching yard 4. In this embodiment, three piers 3 are shown as an example, but there may be two or more piers 3. The bridge erection method related to the first step is performed as follows: a connection step, a launching step, a temporary support step, a height adjustment step, and a main body support step.

[0025] As shown in Figures 1 and 6(a), the connection process involves placing the hand-operated machine 1 on the trolley 5 and connecting the bridge girder 2 to the rear end of the hand-operated machine 1.

[0026] As shown in Figures 2 and 6(b), the launching process involves moving a trolley 5 that travels along rails to launch the launching machine 1 and bridge girder 2 towards the bridge pier 3. During the launching process, the launching machine 1 is launched in the direction of the bridge axis until the protruding part 12 reaches above the second bridge pier 3 and the main body 11 is positioned slightly in front of the second bridge pier 3. At this time, the main body 11 of the launching machine 1 is in a cantilevered state and bends under its own weight, causing its tip to be displaced downward from the horizontal position.

[0027] As shown in Figure 2, the temporary support step is the process of temporarily supporting the projection 12 of the cannon 1 on the support portion 6 formed on the bridge pier 3. Even if the tip of the cannon 1 is displaced downward due to its own weight, the projection 12 is located higher than the upper end of the bridge pier 3, so the projection 12 can be placed on the support portion 6. More specifically, the projection 12 is placed on the launching device 20 installed on the support portion 6 and temporarily set in place.

[0028] As shown in Figures 3 and 6(c), the height adjustment process involves using vertical jacks (not shown) provided on the bridge pier 3 to jack up the protruding portion 12 of the cannon 1, thereby displacing the tip of the cannon 1 upward. In the height adjustment process, a sandle (support member) 30 is constructed using sandle members to support the protruding portion 12 while adjusting the height. More specifically, as shown in Figure 4, the sandles 30, 30 are positioned outside the launching device 20 in the direction perpendicular to the bridge axis and support the cantilevered portions 13, 13. A chill tank 31 is placed between the sandles 30 and the cantilevered portions 13. The chill tank 31 allows the cannon 1 to be supported in a state where it can move in the bridge axis direction. In the height adjustment process, the height is adjusted so that the lower surface of the main body 11 can be placed on the launching device 20.

[0029] As shown in Figure 5, the main body support process involves using the launching device 20 and the chill tank 31 to further launch the launching machine 1 and the bridge girder 2 in the bridge axis direction, thereby supporting the main body 11 of the launching machine 1 on the bridge pier 3. This completes the first process, and the second process is then carried out.

[0030] The bridge erection method in the second stage involves a launching stage, a temporary support stage, a height adjustment stage, and a main body support stage. Since each stage is generally the same as in the first stage, detailed explanations will be omitted.

[0031] As shown in Figure 6(d), in the launching process, the hand-launching machine 1 is sent from the second pier 3 towards the third pier 3. As a result, the projection 12 reaches the third pier 3, and the bridge girder 2 is erected between the first pier 3 and the second pier 3.

[0032] As shown in Figure 6(e), in the temporary support process, the protruding portion 12 is temporarily supported on the third bridge pier 3. In the height adjustment process, the protruding portion 12 is jacked up to adjust its height.

[0033] As shown in Figure 6(f), in the main body support process, the main body 11 is supported by the third pier 3. Subsequently, the bridge girder 2 is erected between the second and third piers 3 while the launching machine 1 is moved in the direction of the bridge axis. The launching machine 1 is then sequentially dismantled while being moved in the direction of the bridge axis. Finally, the bridge girder 2 is placed on the support 6a to complete the process.

[0034] Here, we will explain a conventional bridge erection method using the launching method. Figure 7 shows a diagram of the conventional launching method. As shown in Figure 7(a), a launching machine 101 is placed on a trolley 5 and a bridge girder 2 is connected to the rear end of the launching machine 101. As shown in Figure 7(b), when the launching machine 101 and bridge girder 2 are launched towards the second bridge pier 3, the launching machine 101 sags under its own weight, and by the time the tip of the launching machine 101 reaches the second bridge pier 3, the height of the launching machine 101 is lower than that of the bridge pier 3. Therefore, as shown in Figure 7(c), a bent device 107 is installed in front of the bridge pier 3, and the height is adjusted by jacking up the launching machine 101 on the bent device 107. Furthermore, as shown in Figure 7(d), when reaching the third pier 3, the cantilever machine 101 would bend again, so it was necessary to install the bent equipment 107 again in front of the third pier 3, as shown in Figure 7(e). In other words, it was necessary to install the bent equipment 107 at each pier 3 and then dismantle the bent equipment 107 after the work was completed, as shown in Figure 7(f). Thus, attempting to avoid interference between the cantilever machine 101 and the piers 3 using the bent equipment 107 presented problems in terms of both cost and time. In addition, in some cases, it may be difficult to install the bent equipment 107 in front of the piers 3.

[0035] In contrast, according to the cannon machine 1 of this embodiment, a projection 12 is positioned on the tip side of the main body 11, protruding further forward than the main body 11 and located on the upper part of the main body 11. In other words, because the projection 12 is formed above and in front of the main body 11, even if the cannon machine 1 bends under its own weight and the tip of the cannon machine 1 is displaced downward, causing the main body 11 to be lower than the top surface of the pier 3, the projection 12 can maintain a position higher than the pier 3. This allows the projection 12 to be jacked up on the pier 3, and by displacing the projection 12 upward, the main body 11 can be raised to a position higher than the top surface of the pier 3. Therefore, there is no need to separately provide a temporary support (bent equipment) in front of the pier 3, and interference between the cannon machine 1 and the pier 3 can be easily avoided.

[0036] Furthermore, the bridge erection method of this embodiment includes a connection step of connecting the launching machine 1 and the bridge girder 2, a launching step of sending the launching machine 1 toward the bridge pier 3 together with the bridge girder 2, a temporary support step of temporarily supporting the protruding portion 12 of the launching machine 1 on the bridge pier 3, a height adjustment step of raising the protruding portion 12 on the bridge pier 3 to adjust its height and supporting the protruding portion 12 via the sandle (support member) 30, and a main body support step of further sending the bridge girder 2 and the launching machine 1 toward the bridge axis and supporting the main body 11 on the bridge pier. As a result, interference between the launching machine 1 and the bridge pier 3 can be easily avoided when performing the launching method, similar to the effects described above.

[0037] Furthermore, as shown in Figure 4, the protruding portion 12 is equipped with an overhang portion 13 that extends perpendicular to the bridge axis from the main body portion 11, and in the height adjustment process, the overhang portion 13 is supported on the bridge pier 3 via the sandle (support member) 30. This prevents interference between the main body portion 11 and the sandle 30, which are delivered later. As a result, construction can be carried out continuously without dismantling the sandle 30, thus shortening the construction period. In other words, the first and second processes can be carried out continuously without dismantling the sandle 30.

[0038] <Second Embodiment> Next, a second embodiment of the present invention will be described with reference to Figures 8 and 9. The hand-rolling machine 1A according to this embodiment differs from the first embodiment in that it does not have an overhanging portion. That is, the hand-rolling machine 1A comprises a main body portion 11 and a protruding portion 12. Note that the structure of the main body portion 11 and the protruding portion 12 is the same as that of the first embodiment, so a description will be omitted.

[0039] As shown in Figures 8 and 9, the sandol 30 in this embodiment is positioned behind the feeding device 20 (towards the front in the feeding direction) and supports the protruding portion 12.

[0040] The hand-operated launching machine 1A described above can achieve substantially the same effects as the first embodiment. Furthermore, if space cannot be secured on the bridge pier in the direction perpendicular to the bridge axis, the cantilevered portion may be omitted and the sandol 30 may be arranged as in this embodiment.

[0041] While embodiments of the present invention have been described above, design modifications can be made as appropriate, as long as they do not contradict the spirit of the invention. Although examples have been given of cases where the support section, launching device, and sander are arranged on the bridge pier, for example, if the space on the bridge pier is narrow, brackets for installing these facilities may be placed on the sides of the bridge pier to increase the surface area of ​​the top surface of the bridge pier. In the example described, the lower chord member 12b of the protruding portion 12 is connected to the upper chord member 11a of the main body portion 11 by a high-strength bolt connection, but it may also be connected by welding. [Explanation of Symbols]

[0042] 1. Hand-rolling machine 2 Bridge girders 3 Bridge piers 4 Dispatch Yard 5 carts 6 Bearing part 11 Main body 12 Protrusion 13 Overhang 30 Sandol (support member)

Claims

1. A hand-launching machine attached to the leading end of a bridge girder being launched in the direction of the bridge axis, and which is launched together with the bridge girder, The main body extends in the direction of the bridge axis, The tip of the main body portion includes a projection that protrudes further forward than the main body portion and is located on the upper part of the main body portion, The aforementioned protruding portion is characterized by being temporarily supported on the bridge pier at the delivery destination.

2. The aforementioned protruding portion includes an overhang that extends perpendicular to the bridge axis from the main body portion, The hand-operated machine according to claim 1, characterized in that the overhang portion is supported on the bridge pier via a support member.

3. A bridge erection method using a hand-launching machine attached to the leading end of a bridge girder being launched in the direction of the bridge axis, and which is launched together with the bridge girder, A hand-launching machine having a main body extending in the direction of the bridge axis and a projection that protrudes further forward than the main body and is located on the upper part of the main body, and a connecting process for connecting the bridge girder, A sending process in which the hand-launching machine is sent towards the bridge pier together with the bridge girder, A temporary support step of temporarily supporting the protruding part of the hand-operated machine on the bridge pier, A height adjustment step involves raising the protruding portion on the bridge pier to adjust its height and supporting the protruding portion via a support member, A bridge erection method characterized by comprising a main body support step, in which the bridge girder and the hand-operated machine are further extended in the direction of the bridge axis, and the main body is supported on the bridge pier.

4. The aforementioned protruding portion includes an overhang that extends perpendicular to the bridge axis from the main body portion, The bridge erection method according to claim 3, characterized in that the overhang portion is supported on the bridge pier via the support member during the height adjustment step.

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