Construction method of temporary pier

Abstract

To provide a construction method of a temporary pier capable of constructing a lower structure of the temporary pier without using any scaffold facilities such as fixed-type scaffolds designed per site which have been previously used.SOLUTION: A construction method comprises the steps of: extending a work deck mechanism 20 frontward and downward in a state an under-stair work vehicle 10 is loaded on an existing upper structure 30; and attaching a reinforcement 37a between newly installed support piles 35a, 35a adjacent to each other positioned in front of the existing upper structure 30 using the under-stair work vehicle 10 provided with a self-travel vehicle part 11 and the work deck mechanism 20 loaded on the vehicle part 11, wherein the work deck mechanism 20 is provided with a plurality of boom elements capable of extending frontward and downward to the vehicle part 11 and a work cage 25 arranged on a tip of a leading boom element on which a worker is able to board.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method for constructing a temporary pier, and more particularly to a method for constructing a temporary pier in which substructure work is performed using a below-floor work vehicle without using a fixed work scaffold. [Background technology]

[0002] Generally, a temporary pier consists of a substructure and a superstructure. The substructure consists of multiple support piles, reinforcing materials such as diagonal members (brace materials) and horizontal connecting materials installed between adjacent support piles, and supporting girders, while the superstructure consists of multiple main girders and covering plates that are installed horizontally between the heads of the support piles.

[0003] To explain in detail the construction method for the substructure, a crane vehicle or other equipment placed on the existing superstructure is used to erect new support piles a specified distance in front of the existing superstructure. After the heads of the new support piles are fused at a predetermined height, top plates are attached to the heads of the new support piles, and then new support girders are installed between the heads of the new support piles. Next, brace material is retrofitted between adjacent support piles in a direction perpendicular to the bridge axis. When constructing such substructure, it is necessary to set up scaffolding equipment for work using brackets etc. attached to the newly installed support piles.

[0004] Various types of scaffolding equipment, such as those shown below, are used for the construction of the substructure. [A] Fixed scaffolding method: A fixed, horizontal scaffolding device installed directly on one side between adjacent support piles. [i] Suspended scaffolding method: A suspended scaffolding device with a gondola structure suspended from the superstructure (Patent Document 1). [c] Scaffolding stage system for earth retaining: A scaffolding device for earth retaining constructed by suspending steel materials between adjacent support piles (Patent Document 2). [E] Aerial work platform system: an aerial work platform equipped with a boom mechanism capable of extension and rotation, etc., and a gondola attached to the tip of the boom mechanism (Patent Document 3). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2012-229540 A [Patent Document 2] JP 2006-265899 A [Patent Document 3] JP 2001-19374 A Summary of the Invention [Problem to be solved by the invention]

[0006] Conventional construction techniques for the substructure of temporary piers have the following problems: <1> Depending on the situation at the site, a variety of scaffolding devices are selected and used, but not only does it take a lot of time and effort to set up the scaffolding, it also takes a lot of time and effort to remove the scaffolding. Therefore, there is room for improvement in the constructability of the substructure. <2> In order to attach a scaffolding device to the periphery of a support pile, brackets or the like must be welded and attached to the support pile to match the height of the site, so the support pile with the bracket cannot be reused as is after construction is completed. <3> When using aerial work vehicles, it is not possible to use them to carry out substructure construction at sites where there are obstacles such as rivers or large rocks. <4> Conventional fixed scaffolding systems require a large amount of scaffolding materials, which necessitates storage space, and when repurposing the materials, they need to be moved in accordance with the construction steps. <5> Since scaffolding is also used when dismantling the temporary pier, it is necessary to leave the scaffolding in place until the temporary pier is removed, which requires a lot of temporary materials.

[0007] The present invention aims to provide a method for constructing a temporary pier that can solve the above problems. [Means for solving the problem]

[0008] The present invention is a method for constructing a temporary pier, in which a subwork process is carried out on a span-by-span basis, in which support piles are erected at a predetermined interval, and after processing the heads of the support piles, support girders are installed between the heads of the support piles and reinforcement materials are attached between adjacent support piles, and a superwork process is carried out in which multiple main girders are placed above the subwork, covering plates are laid on the main girders, and the superwork is constructed.A below-level work vehicle equipped with a self-propelled vehicle unit and a work deck mechanism mounted on the vehicle unit is used, and the work deck mechanism is equipped with multiple boom elements that can be extended downward and forward from the vehicle unit, and a work cage in which workers can ride is provided at the tip of the foremost boom element, and with the below-level work vehicle mounted on the existing superwork, the work deck mechanism is extended downward and forward, and the subwork is constructed in front of the existing superwork. In another embodiment of the present invention, the working deck mechanism comprises one of a telescopic slide mechanism, a lifting mechanism, a swivel mechanism, and a rotation mechanism. In another form of the present invention, the work deck mechanism comprises a telescopic first boom mounted sideways on the vehicle section, a telescopic second boom connected to the tip of the first boom so that it can be raised and lowered downwards, and a telescopic third boom connected sideways to the lower end of the second boom, a work cage is provided at the tip of the third boom, and the extension position of the work cage toward the bridge axis direction is adjusted by adjusting the raising and lowering angle of the second boom. In another aspect of the present invention, the work deck mechanism may include a pair of portal frames, and may be configured to support a first boom via the pair of portal frames. In another aspect of the present invention, the third boom is capable of horizontally rotating about the second boom via a rotating mechanism, and the intersection angle of the third boom with the first boom is adjustable via the rotating mechanism. In another embodiment of the present invention, the work cage comprises a floor panel, an extension floor, and handrails, and is constructed using an extension floor that is extended relative to the floor panel. In another embodiment of the present invention, a separate bridge axis reinforcement member may be installed between the existing support pile and the new support pile using the above-mentioned lower floor work vehicle. Effect of the Invention

[0009] The present invention has at least one of the following advantages. <1> In the present invention, the work deck mechanism of the below-floor work vehicle mounted on the existing superstructure can be used to carry out work such as pile head treatment for newly constructed support piles, installation of newly constructed support girders, and installation of newly constructed reinforcing materials such as diagonal members and horizontal ties between the newly constructed support piles. Therefore, in the present invention, the substructure of the temporary pier can be constructed without using any of the scaffolding devices such as fixed scaffolding designed for each site, which have been used in the past. <2> Since the scaffolding device is not fixed to the outer peripheral surface of the support pile, there is no need to worry about damaging the support pile due to welding or the like, and the support pile can be easily repurposed. <3> By inserting a retractable second boom between the first beam and the third beam as a means for extending the work cage that constitutes the work deck mechanism of the below-level work vehicle, the extension of the work cage can be adjusted economically. <4> Since the third boom can be rotated horizontally around the second boom via a rotation mechanism, the intersection angle between the third boom and first boom 21a can be adjusted as desired to suit the site. <5> Even if there is a river flowing above ground at the construction site or there are obstacles such as large rocks, construction can be carried out smoothly using a below-level work vehicle without being affected by these rivers or obstacles. <6> The work deck mechanism of the below-floor work vehicle can also be used as a rescue facility in an emergency. [Brief description of the drawings]

[0010] [Figure 1] Overall diagram of the below-level work vehicle used in the construction of the temporary pier [Diagram 2] Model diagram of constructing a temporary pier using a below-floor work vehicle [Diagram 3] Plan view in Fig. 2 [Figure 4] Model diagram of temporary pier construction method using a crane vehicle DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present invention will be described in detail below with reference to the drawings.

[0012] <1> Downstairs work vehicle A below-stage working vehicle 10 used in the construction of a temporary pier will be described with reference to Figs. The downstairs work vehicle 10 is a special vehicle that is mounted on the existing superstructure 30 to enable construction of a new substructure.

[0013] The downstairs work vehicle 10 comprises a self-propelled vehicle section 11, a work deck mechanism 20 mounted on the vehicle section 11, and a work cage 25 provided at the tip of the work deck mechanism 20.

[0014] <2> Vehicle Division The vehicle section 11 is a vehicle for mounting the working deck mechanism 20, and has crawler-type or wheel-type traveling means and a wheelhouse for self-propelling the vehicle section 11. The wheelhouse can rotate horizontally at any angle around a vertical axis relative to the traveling means. The vehicle section 11 may be provided with outriggers on both the left and right sides of the vehicle section as required.

[0015] <3> Working deck mechanism The work deck mechanism 20 has a plurality of boom elements and a work cage 25 provided at the tip of the foremost boom element. Furthermore, the work deck mechanism 20 is equipped with a telescopic slide mechanism, a raising and lowering mechanism, a turning mechanism, a rotation mechanism, etc., which are formed by hydraulic drive devices such as hydraulic cylinders and hydraulic motors, and electric drive devices, etc. Each boom element is extendable and retractable, and each boom element is connected to each other so as to be rotatable about a horizontal or vertical axis. The work deck mechanism 20 is capable of moving the work cage 25 to any desired height by extending and retracting multiple booms and rotating the boom elements.

[0016] <3.1> Example of working deck mechanism Regarding the work deck mechanism 20 illustrated in Figures 1 to 3, the work deck mechanism 20 in this example comprises a first boom 21a at a base end close to the vehicle section 11, a second boom 21b, a third boom 21c, a pair of gate-shaped frames 22a, 22b supporting the first boom 21a, and a work cage 25 provided at the tip of the third boom 21c.

[0017] The three booms 21a to 21c each have an independent telescopic slide mechanism, and can be individually telescopically operated. The maximum extension dimension of each of the booms 21a to 21c can be appropriately selected.

[0018] <3.2> Relationship between the first boom and the vehicle The first boom 21a is mounted on the vehicle section 11 and is an extendable boom oriented horizontally. The first boom 21a is capable of horizontal rotation in accordance with the rotation of the wheelhouse.

[0019] <3.3> Relationship between the first boom and the second boom The tip of the first boom 21a pivotally supports the upper part of the second boom 21b. The second boom 21b is an extendable boom that can be arranged facing downward (vertically) relative to the vehicle section 11, and the second boom 21b can be raised and lowered in the front-rear direction via a rotation mechanism having a horizontal shaft. By extending the entire length of the second boom 21b, the work cage 25 can be lowered downward. In this example, the telescopic slide mechanism of the second boom 21b is configured in three stages, but the total number of telescopic slide mechanisms of the second boom 21b can be appropriately selected.

[0020] <3.4> Reasons for constructing the second boom in an up-down configuration Furthermore, one possible means of extending the work cage 25 in the bridge axis direction is to set the horizontal extension amount of the first boom 21a and the third boom 21c to be long, but not only is there a limit to the length that can be set, but this would also be costly.

[0021] Therefore, in the present invention, the upper part of the second boom 21b is pivotally supported on the tip of the first boom 21a so that the second boom 21b can be raised and lowered in the bridge axis direction (front-rear direction). By adjusting the angle at which the second boom 21b is raised and lowered, the amount of projection of the work cage 25 in the bridge axis direction can be adjusted.

[0022] <3.5> Relationship between the second boom and the third boom The lower end of the second boom 21b is pivotally supported on the base end of the third boom 21c. The third boom 21c is a telescopic boom disposed laterally. The base end of the third boom 21c is vertically rotatable relative to the second boom 21b via a horizontal shaft, and the third boom 21c is horizontally rotatable relative to the second boom 21b via a vertical shaft.

[0023] <3.6> Why the third boom is designed to be horizontally rotatable relative to the second boom The third boom 21c is capable of rotating in the vertical direction relative to the second boom 21b via a rotating mechanism, and the third boom 21c is capable of horizontally rotating about the second boom 21b via a rotating mechanism. The third boom 21c can always ensure horizontality via the rotation mechanism without being affected by the tilt angle of the second boom 21b. Furthermore, the intersection angle between the third boom 21c and the first boom 21a can be adjusted as desired to suit the site via a swivel mechanism (FIG. 3).

[0024] <3.7> Gate-type frame A pair of gate-shaped frames 22a, 22b are suspended from the base end of the first boom 21a. A pair of gate-shaped frames 22a, 22b arranged to straddle the front and rear of the vehicle section 11 are provided with an extendable and retractable slide mechanism at their legs. When traveling, the telescopic slide mechanism of the legs of the gate-shaped frames 22a, 22b is contracted, and when working, the telescopic slide mechanism is extended or contracted to land the legs of the pair of gate-shaped frames 22a, 22b on the ground and ensure a stable posture of the work deck mechanism 20. By supporting the base end of the first boom 21a by the pair of portal frames 22a, 22b, the stability of the work deck mechanism 20 is significantly improved.

[0025] When the weight of the vehicle section 11 is insufficient, a weight 23 is mounted on the rear gate-shaped frame 22b or the vehicle section 11 to compensate for the insufficiency.

[0026] It should be noted that the pair of portal frames 22a, 22b is not essential, and the first boom 21a may be fixed directly to the vehicle portion 11 with the portal frames 22a, 22b omitted.

[0027] <3.8> How to move the work deck mechanism Of course, the work deck mechanism 20 can be moved by the vehicle section 11 propelling itself, but it is also possible to use the crane vehicle 40 described later to hoist the work deck mechanism 20 into a predetermined position and move it either integrally with the vehicle section 11 or separately from the vehicle section 11.

[0028] <4> Work Cage An operation panel for the work deck mechanism 20 is provided on the vehicle section 11, the work cage 25, etc., so that an operator on board the vehicle section 11 or the work cage 25 can operate the movement of the work deck mechanism 20. The work deck mechanism 20 is equipped with a telescopic slide mechanism, a raising and lowering mechanism, a turning mechanism, a rotation mechanism, etc., which are formed by hydraulic drive devices such as hydraulic cylinders and hydraulic motors, or electric drive devices, etc. The work deck mechanism 20 is capable of moving the work cage 25 horizontally, vertically, diagonally up and down, etc. by performing extension, extension, lifting, swiveling, rotational movements, etc. of each of the booms 21a to 21c.

[0029] The work cage 25 is a scaffold stage on which a worker stands to perform various tasks, and is mounted facing upward on the tip of the third boom 21c. The work cage 25 may be mounted non-rotatably on the tip of the third boom 21c, or may be mounted rotatably about a vertical axis.

[0030] The work cage 25 includes, for example, a floor board 25a and handrails 25b erected around the periphery of the floor board 25a. In this example, a foldable extension floor 25c is provided on both sides of a floor plate 25a, and the floor plate 25a can be expanded by unfolding the extension floors 25c to the left and right. The floor plate 25a or the extension floor 25c has a fixed or removable handrail 25b to ensure the safety of workers.

[0031] As another means for extending the floor plate 25a, an extension floor 25c may be configured to be slidable relative to the floor plate 25a.

[0032] [How to build a temporary pier] Next, we will explain how to construct a temporary pier.

[0033] 1. Existing temporary pier Figure 4 shows a temporary pier under construction. The temporary pier is equipped with an existing substructure 36 including multiple existing support piles 35, support girders 31 installed horizontally between the heads of the multiple existing support piles 35, multiple main girders 32 installed between the support girders 31, and an existing superstructure 30 including a lining plate 33 laid on the main girders 32. The existing substructure 36 has existing support piles 35 and existing reinforcing members 37 such as diagonal members and horizontal connecting members installed between adjacent existing support piles 35 in the direction crossing the bridge axis.

[0034] 2. Construction of the substructure <1> Installation of new support piles The lower floor work vehicle 10 and the crane vehicle 40 are mounted on the existing superstructure 30 at a location where they do not interfere with each other. As shown in FIG. 4, a known crane vehicle 40 mounted on the existing superstructure 30 is used to erect a number of new support piles 35a in front of the existing superstructure 30.

[0035] <2> Installation of substructure materials Conventionally, various scaffolding devices such as fixed scaffolding have been used not only when carrying out the above-mentioned pile head treatment work and installation work for the new support girders 31a, but also when retrofitting reinforcing materials 37a such as diagonal members and horizontal connecting materials between adjacent new support piles 35a in the direction perpendicular to the bridge axis, and when retrofitting separate bridge axis reinforcement materials between adjacent existing support piles 35 and new support piles 35a in the bridge axis direction.

[0036] In the present invention, the work deck mechanism 20 of the downstairs work vehicle 10 mounted on the existing superstructure 30 is used as a work scaffolding, the heads of the newly constructed support piles 35a are melted down at a predetermined height, a top plate is attached to the heads of the newly constructed support piles 35a to process the heads, and then a newly constructed support girder 31a is installed between the heads of adjacent newly constructed support piles 35a in a direction perpendicular to the bridge axis. Therefore, in the present invention, these substructures can be constructed without using any of the scaffolding devices such as fixed scaffolding designed for each site, which have been used in the past.

[0037] For example, to attach the new reinforcement material 37a, the new reinforcement material 37a suspended from the crane vehicle 40 is set to match the attachment height of the new support pile 35a.

[0038] A method of installing the new reinforcement member 37a using the work deck mechanism 20 will now be described. The work deck mechanism 20 of the lower work vehicle 10 is folded up small in advance so that a worker can board a work cage 25 provided at the tip of the work deck mechanism 20.

[0039] Once one or more workers have entered the work cage 25, the booms 21a to 21c that make up the work deck mechanism 20 are extended and rotated to move the work cage 25 to the planned work position in front of the existing superstructure 30. Since there are no obstacles in front of the existing superstructure 30, the work deck mechanism 20 can be extended downward and the work cage 25 can be moved to a predetermined intended work position. By adjusting the amount of extension and rotation direction of each boom 21a to 21c that constitutes the work deck mechanism 20, the height, left / right position, and front / rear position of the work cage 25 that extends diagonally downward from the vehicle section 11 can be freely adjusted. The work deck mechanism 20 extending forward of the existing superstructure 30 has a cantilever structure, but is configured so as to be equipped with a weight 23 to ensure weight balance, thereby enabling the vehicle section 11 to maintain a stable posture.

[0040] Once the work cage 25 has been guided to the designated position, new reinforcement members 37a are attached between adjacent new support piles 35a. A worker can install the new reinforcement material 37a in a safe environment while remaining in the work cage 25.

[0041] After completing the installation work on one end of the new reinforcement material 37a, the work deck mechanism 20 is raised and lowered or moved left and right to move the work cage 25 and continue the installation work on the other end of the new reinforcement material 37a.

[0042] One possible means of moving the work cage 25 is to move the below-floor work vehicle 10 itself mounted on the existing superstructure 30; however, in order to move the below-floor work vehicle 10, it is necessary to interrupt work and return the work deck mechanism 20 to its initial position. In the present invention, the working range of the work cage 25 is expanded by performing rotation and swiveling operations of the work deck mechanism 20 while keeping the lower floor work vehicle 10 in place on the existing superstructure 30, without moving the lower floor work vehicle 10 as much as possible.

[0043] When all work has been completed, the work deck mechanism 20 is controlled to return the work cage 25 to the original position of the lower floor work vehicle 10, and the work of the next process is carried out. Since the work cage 25 is not integrated with the newly installed reinforcement material 37a but simply floats in the air, the work cage 25 can be returned to its position on the downstairs work vehicle 10 in a short time once the installation work of the substructure is completed.

[0044] In this way, in the present invention, by using the downstairs work vehicle 10 equipped with the work cage 25, the assembly work of the new substructure can be carried out efficiently in a safe environment. Therefore, it is possible to omit all of the work of designing a scaffolding device for each site, as well as the installation and removal of the scaffolding device. Furthermore, even at construction sites where there is a river flowing above ground or where there are obstacles such as large rocks, construction can be carried out smoothly using the downstairs work vehicle 10 without being affected by these rivers or obstacles.

[0045] In addition, when installing a separate bridge axis reinforcement material between the existing support pile and the new support pile, the below-floor work vehicle 10 can also be used for the work.

[0046] 3. Construction of the superstructure Once construction of the new substructure is completed, the superstructure will be constructed in the same manner as before. When constructing the superstructure, the downstairs work vehicle 10 may be removed together with the work deck mechanism 20, or the crane vehicle 40 may be used to detach only the work deck mechanism 20 from the vehicle section 11 and removed.

[0047] 4. When dismantling and removing the temporary pier The downstairs work vehicle 10 can be used not only when constructing the temporary pier, but also when dismantling and removing the temporary pier. [Explanation of symbols]

[0048] 10. Downstairs work vehicle 11 Vehicle section 20....Work deck mechanism 21a First beam 21b Second beam 21c Third beam 22a···Gate frame 22b···Gate frame 23... Weight 25...Work cage 25a...floorboard 25b Handrail 25c···Expansion floor 30 Existing superstructure 31...Existing support girder 31a New support beam 32...Main girder 33... Covering plate 35...Existing support pile 35a...Newly installed support pile 36 Existing substructure 37 Existing reinforcement material 37a New reinforcement material 40. Crane vehicle

Claims

1. A method for constructing a temporary pier, which includes a substructure process in which support piles are erected at a predetermined interval, the heads of the support piles are treated, and then support girders are installed between the heads of the support piles, and a substructure process in which reinforcement materials are attached between adjacent support piles is constructed, and a superstructure process in which multiple main girders are placed above the substructure, and a covering plate is laid on the main girders to construct the superstructure, is performed on a span basis. A lower floor work vehicle equipped with a self-propelled vehicle section and a work deck mechanism mounted on the vehicle section is used, The work deck mechanism includes a plurality of boom elements that can be extended toward a front downward direction of the vehicle unit, and a work cage that is provided at the tip of the foremost boom element and in which an operator can ride, The lower floor work vehicle is loaded onto the existing superstructure, and the work deck mechanism is extended forward and downward to construct the substructure in front of the existing superstructure. How to build a temporary pier.

2. The method for constructing a temporary pier according to claim 1, characterized in that the working deck mechanism comprises any one of a telescopic sliding mechanism, a raising and lowering mechanism, a rotating mechanism or a pivoting mechanism.

3. 2. A method for constructing a temporary pier as described in claim 1, characterized in that the work deck mechanism comprises an extendable first boom mounted laterally on the vehicle section, an extendable second boom connected to the tip of the first boom so that it can be raised and lowered downward, and an extendable third boom connected laterally to the lower end of the second boom, a work cage is provided at the tip of the third boom, and the extension position of the work cage toward the bridge axis direction is adjusted by adjusting the raising and lowering angle of the second boom.

4. 2. A method for constructing a temporary pier as claimed in claim 1, characterized in that the working deck mechanism comprises a pair of portal frames and is configured to support a first boom via the pair of portal frames.

5. A method for constructing a temporary pier as described in claim 2, characterized in that the third boom is capable of horizontal rotation around the second boom via a rotation mechanism, and the intersection angle of the third boom with the first boom is adjustable via the rotation mechanism.

6. 2. A method for constructing a temporary pier as claimed in claim 1, characterized in that the work cage comprises a floor plate, an extension floor and handrails, and construction is carried out using an extension floor that is extended relative to the floor plate.

7. 2. The method for constructing a temporary pier according to claim 1, further comprising the step of installing a separate bridge axis reinforcement member between the existing support pile and the new support pile using the lower level work vehicle.

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