Deck replacement method and construction machinery used for this

Abstract

To reduce the range and the period of traffic regulation of a road as much as possible by utilizing an advantageous point of using a portal crane and improving a disadvantageous point of using the portal crane in floor slab replacement work of an expressway.SOLUTION: In the floor slab replacing method, the construction machine M comprising a hydraulically driven telescopic support structure is moved immediately after each floor slab removing position by a traveling mechanism RL comprising a traveling wheel unit R and a traveling rail L, and a removal / carrying-out step of an existing floor slab and a carrying-in / installation step of a new floor slab are repeatedly performed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a deck replacement method used in expressway deck replacement work and a construction machine used therefor. [Background technology]

[0002] The concrete decks of expressways deteriorate due to aging, fatigue caused by heavy traffic, and salt damage caused by antifreeze and airborne salt. In order to maintain the expressway, deck replacement work is carried out to remove the existing decks and replace them with new ones.

[0003] In conventional deck replacement work of this type, when removing the existing deck, the reinforced concrete deck erected on the steel main girders is cut to the specified size using a special machine, loaded onto a transport vehicle using a crane, and transported away by the transport vehicle. After cleaning the area where the existing deck was removed, a new deck is installed in this location. When installing a new deck, the new deck is brought in by a transport vehicle, lifted from the transport vehicle with a crane, and lowered into the area where the existing deck was removed.

[0004] In this type of deck installation work, mobile cranes and gantry cranes are mainly used to remove and move the existing deck and to move and install the new deck. Mobile cranes have a rotating body and a boom for lifting materials at the top and a self-propelled mechanism at the bottom, and so-called crane vehicles such as all-terrain cranes and rough terrain cranes are used. This type of mobile cranes is generally known, not just to those skilled in the art, and there is no need to specifically cite prior art documents. A gantry crane consists of a gantry frame and a winding device for lifting materials installed at the top. Dedicated rails are installed on the construction surface, and the crane is assembled on these rails and moved along them. This type of gantry crane has been proposed in Patent Document 1 and elsewhere.

[0005] Since this type of deck replacement work is carried out on an in-service expressway, traffic restrictions on a certain section of the road are necessary for a certain period of time to ensure a construction yard. Because of the significant negative social and economic impacts of this work, construction methods are needed to minimize the duration and scope of road traffic restrictions. However, deck replacement work requires large cranes with high lifting capacity, as the weight of the load to be lifted exceeds 10 tons, and a construction yard is required to accommodate these cranes. Furthermore, bridges, in particular, often have gradients in both the longitudinal and transverse directions, making wheeled cranes prone to running downhill. This necessitates equipment to prevent the crane from running away, and increased power is required to move the crane uphill. Furthermore, if there are existing structures or movements of general road users that are not subject to construction work near the construction site, such as overhead power lines or overpasses, or vehicles or people passing on the opposite side of the road, it will be necessary to ensure sufficient safety for these objects and people, and measures to address this will be required.

[0006] When looking at the applicability of mobile cranes and gantry cranes to the various demands at construction sites, there are the following differences:

[0007] When using a mobile crane for construction, the crane requires outriggers and other equipment to prevent it from tipping over or running away, requiring a certain amount of space for installation. Furthermore, during construction, the construction site is divided into sections by the crane, as the deck removal and installation area, the crane, and the deck transport vehicle are lined up in a row. During construction, the crane's boom rotates 180 degrees, unavoidably for the boom and the load to pass outside one lane of traffic. This makes it extremely difficult to limit the crane's installation space and rotation range to within one lane of traffic. Furthermore, if there are overhead restrictions at the bridge site, the tip of the crane's boom must be kept below the restrictions, which can make it difficult to ensure the load's lifting height. However, mobile cranes can be self-propelled on public roads and have no power issues. Furthermore, the crane is equipped with outriggers and other equipment, allowing it to be installed stably, reducing the possibility of it tipping over or running away.

[0008] When using a gantry crane for construction work, a decrease in lifting capacity due to a reduction in crane width is unlikely. Therefore, by pre-adjusting the crane width and manufacturing it, traffic restrictions can be kept within a certain range on the road. Furthermore, because there is space inside the gantry crane's body, deck transport vehicles can be guided to the deck replacement location, eliminating the need for a separate waiting space in the construction yard. Furthermore, since the load carried by this gantry crane is moved only inside the gantry crane's body, the load never passes outside the traffic restrictions, and headroom restrictions can be met by adjusting the gantry crane's body below the headroom restrictions. Therefore, deck replacement work using a gantry crane can reduce the area of ​​road traffic restrictions. However, because gantry cranes are manufactured at the construction site, crane completion inspections are required during the construction period. Furthermore, the rails used for gantry crane movement are also subject to completion inspections. Installing the rails in parallel with deck replacement requires a re-inspection, which is inefficient. In other words, deck replacement work using a gantry crane involves three steps: crane assembly, parallel rail installation, completion inspection, and rail removal when the deck is removed. This results in longer road traffic restrictions compared to deck replacement work using a mobile crane. Furthermore, gantry cranes often use steel rails and steel wheels, resulting in low friction between the two. Therefore, when roads have longitudinal or transverse gradients, such as at bridge construction sites, gantry cranes require increased power to move up the gradient. Furthermore, there is a risk of the crane running away down the gradient, which must be prevented. However, by leveling the rails, increased power is not required and the risk of running away is reduced. Horizontal rail installation is also possible by placing filler material underneath the rails. However, if the rails are installed horizontally across the entire bridge, the rail ends must be raised significantly, making installation difficult. Furthermore, although the raised height can be kept relatively small by installing the divided rails horizontally one by one, steps are created at the joints of each rail, and the gantry crane cannot pass over these steps, so the gantry crane must be disassembled and reassembled for each step.

[0009] As such, there are advantages and disadvantages to using both mobile cranes and gantry cranes for deck replacement work. However, when comparing the use of gantry cranes with that of mobile cranes, the use of gantry cranes is more disadvantageous in terms of traffic restriction periods. Therefore, when carrying out deck replacement work, it is necessary to use these construction machines according to the site conditions and to use them after improving the disadvantages of each. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 2019-173435 Summary of the Invention [Problem to be solved by the invention]

[0011] As mentioned above, construction using a gantry crane is at a disadvantage compared to construction using a mobile crane in terms of the period during which traffic is restricted. However, compared to construction using a mobile crane, the lifting capacity is not affected by the width of the machine, the load does not pass outside the traffic restrictions, it can be applied to heights under overhead restrictions, and deck transport vehicles can be guided to the vicinity of the deck replacement location, so it is very useful in reducing the area of ​​road traffic restrictions.

[0012] Therefore, the present invention aims to provide a new deck replacement method and construction machine to be used therefor that utilizes the advantages of using a gantry crane and improves the disadvantages of using a gantry crane in highway deck replacement work, thereby minimizing the scope and duration of road traffic restrictions as much as possible. [Means for solving the problem]

[0013] In order to achieve the above object, the present invention provides: In a deck replacement method in which the existing deck in the section of a highway where the deck is to be replaced is removed from the main girder and a new deck is installed on the main girder, The machine body is constructed by connecting at least three pairs of vertically extendable support columns with a predetermined interval between each column, and a pair of conveying guide rails is arranged between the upper parts of each of the support columns with both ends in the longitudinal direction extending from each of the support columns at both ends, and a telescopic support structure is used, which is configured by bridging the conveying guides between the conveying guide rails and mounting fasteners that can be connected to the floor slab, and a traveling mechanism that travels the telescopic support structure on the existing floor slab, The telescopic support structure is installed immediately after the first deck removal position in the deck replacement section via the traveling mechanism, and one end of the pair of conveying guide rails is positioned above the first deck removal position as the conveying start end, and the other end side is positioned as the conveying end, After cutting the existing deck slab in the deck replacement section to a predetermined size, the entire telescopic support structure is contracted to lower the pair of conveying guide rails, and the fasteners are connected to the cut existing deck slab at the conveying start ends of the pair of conveying guide rails. The entire telescopic support structure is extended to raise the pair of conveying guide rails, and the cut existing deck slab is lifted with the fasteners. The fasteners are then connected to the pair of conveying guide rails via the conveying guide. of By moving from the conveying start point to the conveying end point, the cut existing deck slab is carried out, and by repeating this removal and carrying-out process of the existing deck slab, the existing deck slab at the initial deck slab removal position is removed and carried out, After removing and transporting the existing deck slab from the initial deck slab removal position, the other end of the pair of conveying guide rails is set as the conveying start end and one end is set as the conveying end, and a new deck slab is carried in below the conveying start end, and then the pair of conveying guide rails is lowered by contracting the entire telescopic support structure, the fasteners are connected to the new deck slab at the conveying start end of the pair of conveying guide rails, the entire telescopic support structure is extended to raise the pair of conveying guide rails, and the new deck slab is lifted by the fasteners, and the fasteners are connected to the pair of conveying guide rails via the conveying guide. ofBy moving from the conveying start point to the conveying end point, a new deck slab is carried in, and after the new deck slab is carried in, the pair of conveying guide rails is lowered by contracting the entire telescopic support structure, and the new deck slab is installed at the removal position of the existing deck slab, and this process of carrying in and installing the new deck slab is repeated to carry in and install the new deck slab at the initial deck slab removal position, Thereafter, the telescopic support structure is moved by the traveling mechanism to immediately after each deck slab removal position, and the process of removing and carrying out the existing deck slab and the process of carrying in and installing the new deck slab are repeated. The gist of this is as follows.

[0014] In this case, it is preferable to use a pair of running wheel units and a pair of running rails for the running mechanism, provide the pair of running wheel units at the lower ends of each pair of pillars, lay the pair of running rails on both sides of the width of the deck replacement section, and place the telescopic support structure on each running rail via each running wheel unit and move on each running rail. In particular, in the case of bridges and the like, when there is a gradient in the deck replacement section, a pair of running rails is composed of a plurality of divided rails having a length that is approximately the same as or slightly longer than the distance between the front end of each running wheel unit on the front side of each pair of adjacent support columns at the front and rear of the telescopic support structure and the rear end of each running wheel unit on the rear side of the other, and each of the divided rails is installed horizontally in the deck replacement section via filler, and a step is formed between the joints of each of the divided rails, and when the telescopic support structure is moved on each of the running rails, the running wheel unit of one of the pair of support columns reaches the step. It is desirable that the other two running wheel units have a travel distance remaining before reaching the step, and that each time one of the running wheel units reaches the step, the other two units support the entire telescopic support structure, and by contracting the supports of that one running wheel unit, the one running wheel unit is raised to a height that exceeds the step, and from this state the other two running wheel units move the telescopic support structure on the running rails, so that the one pair of running wheel units straddles and overcomes the step.

[0015] In addition, (depending on the construction conditions, site conditions, and design conditions (weight and strength) of the pair of conveying guide rails) a pair of cheek support pillar guides may be arranged in parallel on each end side extending from a pair of pillars at one end of the pair of conveying guide rails, and a pair of cheek support pillars may be arranged that are engaged with each of the one end sides so as to be relatively movably connected via each of the cheek support pillar guides and that are extendable and contractible in the vertical direction, and each of the one end sides may be supported by each of the cheek support pillars.

[0016] In order to achieve the above object, the present invention provides: A construction machine used in the above deck replacement method, a body formed by connecting at least three pairs of support columns each having a built-in telescopic drive unit that can be extended and retracted in the vertical direction with a predetermined interval between each column, and a telescopic control unit that controls each of the telescopic drive units collectively or individually; a pair of conveying guide rails disposed between the upper portions of each pair of support columns, with both ends in the length direction of the pair of support columns extending from the support columns at both ends; a conveying guide disposed between the conveying guide rails and capable of advancing and retreating along the conveying guide rails; a forward / backward driving unit that drives the conveying guide on the conveying guide rails; and a control unit that controls the forward / backward driving unit. advance and retreat A control unit; The expansion / contraction control unit and the advance and retreat The telescopic control unit and the control unit are operatively connected to each other by wire or wirelessly. advance and retreat an operation unit common to the control unit or separate from the control unit; A fastener mounted on the conveying guide and connectable to the deck slab; The present invention is configured to include: The pair of conveying guide rails are installed immediately after each deck slab removal position in the deck slab replacement section via a traveling mechanism, and one end of the pair of conveying guide rails is arranged above each deck slab removal / installation position as the conveying start end or conveying end, and the other end is arranged at the deck slab carry-in / out destination as the conveying end or conveying start end. The gist of this is as follows.

[0017] In this case, the traveling mechanism comprises a pair of traveling wheel units and a plurality of divided rails having a length that is approximately the same as or slightly longer than the distance between the front end of each traveling wheel unit on the front side of each pair of adjacent support columns in the front and rear of the vehicle body and the rear end of each traveling wheel unit on the rear side of each pair of adjacent support columns in the front and rear of the vehicle body, and a pair of traveling rails that guide the pair of traveling wheel units, and a pair of traveling rails that drive the pair of traveling wheel units to travel on the pair of traveling rails. Running a driving unit and a travel control unit that controls the travel driving unit; and an extension control unit (as described above in paragraph 0016) that is operatively connected to the travel control unit by wire or wirelessly. advance and retreat It is preferable that the control unit and a common or separate operating unit are provided, the pair of running wheel units are provided at the lower ends of each pair of pillars, and the pair of running rails are laid on both sides of the width of the deck replacement section.

[0018] In addition, (depending on the construction conditions, site conditions, and design conditions (weight and strength) of the pair of conveying guide rails) a pair of cheek support posts may be provided to support each end side extending from a pair of posts at one end of the pair of conveying guide rails, and the pair of cheek support posts may be telescopic posts with built-in telescopic drive units that allow them to extend and retract in the vertical direction, and a pair of cheek support guides may be arranged side by side on each of the one end sides so that they can be moved along each of the one end sides via each of the cheek support guides. [Effects of the Invention]

[0019] The deck replacement method and construction machine used therefor according to the present invention provide the following unique operational effects. (1) The construction machinery can be made smaller in width and height depending on the construction site, but this does not result in a decrease in deck lifting or transport performance or a decrease in deck replacement work efficiency, making it ideal for single-lane construction on elevated roads and bridges with overhead restrictions. (2) The traveling mechanism uses a pair of traveling wheel units and a pair of traveling rails, and the pair of traveling rails is made up of multiple divided rails. Even if there is a longitudinal gradient on the construction surface such as a bridge, these divided rails are installed horizontally and the construction machine moves on this horizontal traveling rail. Therefore, the presence or absence of a longitudinal gradient on the construction surface such as a bridge does not affect the risk of the construction machine running away, and running away can be prevented by equipment other than outriggers, such as wheel brakes. On the other hand, there is no need to increase the power according to the gradient, as is the case when moving a construction machine up a gradient with a conventional gantry crane. (3) The construction machine has a work space inside, and the deck slab lifting and transporting operations are carried out within this space, so the suspended deck slab will not pass outside the traffic control area, and the deck slab transport vehicle can be guided to the vicinity of the deck slab replacement construction site, allowing the deck slab replacement work to be carried out safely and efficiently. (4) Even if the work of removing and installing the traveling rails is involved, the construction machine does not have a winding device like a conventional gantry crane, so the construction machine is not considered a crane. Therefore, the work of removing and installing the traveling rails can be performed as the same work in the form of replacing the rails, so there is no loss in the process of moving the construction machine compared to a mobile crane. Therefore, this method and the construction machinery used for it are significantly superior to conventional construction machinery in two respects: the scope and duration of traffic restrictions required, and the site conditions such as the size of the applicable site, and can reduce the negative impact that previous deck replacement work has had on society and the economy. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a side view showing an image of a deck replacement method and a construction machine used therefor according to one embodiment of the present invention. [Figure 2] A diagram showing the configuration of the construction machine used in this method ((a) is a side view, (b) is a cross-sectional view taken along line BB in (a), (c) is a cross-sectional view taken along lines AA and CC in (a), and (d) is a cross-sectional view taken along line DD in (a)). [Figure 3] FIG. 10 is a side view showing a modified example of a construction machine used in the method. [Figure 4] A side view showing the movement method of the construction machine used in the method. [Figure 5] A diagram showing a specific example of the method DETAILED DESCRIPTION OF THE INVENTION

[0021] Next, an embodiment of the present invention will be described with reference to the drawings. Figure 1 shows a deck replacement method according to one embodiment of the present invention, along with a construction machine used for this method. Figure 2 shows the construction machine used for this deck replacement method, Figure 3 shows a modified example of this construction machine, and Figure 4 shows the movement method of this construction machine.

[0022] As shown in Figure 1, this deck replacement method (hereinafter referred to as this method) is used in highway deck replacement work, in which the existing deck in the section of the highway where the deck is to be replaced is removed from the main girders and a new deck is installed on the main girders.

[0023] This method uses a construction machine M consisting of a telescopic support structure that can be extended and retracted in the vertical direction, and a traveling mechanism RL that allows the construction machine M to travel on the existing deck slab.

[0024] The telescopic support structure constituting the construction machine M comprises at least three pairs of support columns 10 that can be extended and retracted in the vertical direction, connected with a predetermined distance between each pair to form the machine body 1. Here, the machine body 1 is composed of three pairs of support columns 10. In this machine body 1, a pair of conveying guide rails 2 is horizontally disposed between the upper portions of the support columns 10, with both ends of the rails extending from the support columns 10 at both ends. A conveying guide 3 is horizontally disposed between the conveying guide rails 2. A fastener 4 that can be connected to the deck slab is mounted on this conveying guide 3. In this case, each end of the pair of conveying guide rails 2 extending in the extension direction from the pair of support columns 10 at one end is horizontally supported by a pair of support columns 5. These support columns 5 are a pair of telescopic support columns that can be extended and retracted in the vertical direction, and the upper end of each support column 5 is also provided with an engagement portion 51 that can engage with a pair of support column guide rails 6, which will be described later. A pair of cheek support guide rails 6 are arranged side by side on one end side of the pair of conveying guide rails 2, and each cheek support 5 is arranged upright by engaging with each end side via each cheek support guide rail 6 so that they can move relative to each other.

[0025] As shown in FIG. 2, this construction machine M comprises a machine body 1, which is made up of (at least) three pairs of support columns 10, each having a built-in telescopic drive unit that can be extended and retracted in the vertical direction, connected to each other with a predetermined interval between each pair of support columns 10, a telescopic control unit (not shown) that controls each telescopic drive unit collectively or individually, a pair of conveying guide rails 2 that are disposed between the upper portions of each pair of support columns 10 and extend from the respective support columns 10 at both ends in the length direction, a conveying guide 3 that is disposed between each conveying guide rail 2 and can advance and retreat along each conveying guide rail 2, an advance and retreat drive unit (not shown) that drives the conveying guide 3 to advance and retreat on each conveying guide rail 2, and a control unit (not shown) that controls the advance and retreat drive unit. advance and retreat A control unit (not shown), an expansion / contraction control unit, and advance and retreat An extension control unit that is operatively connected to the control unit by wire or wirelessly; advance and retreat It is configured to include an operating unit (not shown) that is common to the control unit or separate from the control unit, and a fastener 4 that is mounted on the conveying guide 3 and can be connected to the deck slab.

[0026] The pair of cheek rest supports 5 are telescopic supports with built-in telescopic drives that allow them to extend and retract in the vertical direction and support each end of the pair of conveyor guide rails 2 extending from a pair of supports 10 at one end of the pair of conveyor guide rails 2, and have a number of guide rollers with a gripping structure as engaging parts 51 at their upper ends. A pair of cheek rest guide rails 6 are installed in parallel at the bottom of each end of the pair of conveyor guide rails 2. In this way, the pair of cheek rest supports 5 are installed vertically so that they can move along each end, with the guide rollers at their upper ends engaging with the cheek rest guide rails 6 at the bottom of each end.

[0027] The pair of support posts 5 are added depending on the construction conditions, site conditions, and the strength of the steel beams 11, so if each support post 5 is unnecessary, it can be omitted as shown in Figure 3. The construction machine M in Figure 3 is as already explained, and the same reference numerals are used for the parts common to the construction machine M in Figure 2.

[0028] As shown in Figure 1, the traveling mechanism RL uses a pair of traveling wheel units R and a pair of traveling rails L. A pair of traveling wheel units R is installed at each lower end of each pair of support columns 10 of the construction machine M. While the pair of traveling rails L may be a single, long piece on a typical flat elevated road, for bridge applications, the pair of traveling rails L is composed of multiple divided rails L1, each with a length approximately equal to or slightly longer than the distance between the front end of each traveling wheel unit R on the front side of each pair of adjacent support columns 10 at the front and rear of the construction machine M. This pair of traveling rails L is laid on both sides of the width of the deck replacement section. If the deck replacement section has a slope, such as in the case of a bridge, each divided rail L1 is installed horizontally in the deck replacement section via filler material. In this case, a step G is formed between the joints of each divided rail L1. In this way, the construction machine M is placed on each traveling rail L via each traveling wheel unit R and is installed to be movable on each traveling rail L.

[0029] As shown in FIG. 2, this traveling mechanism RL is composed of a pair of traveling wheel units R and a plurality of divided rails L1 having a length that is approximately the same as or slightly longer than the distance between the front end of each traveling wheel unit R on the front side of each pair of pillars 10 adjacent to each other in the front and rear of the construction machine M, and is composed of a pair of traveling rails L that guide the pair of traveling wheel units R, a traveling drive unit (not shown) that drives the pair of traveling wheel units R to travel on the pair of traveling rails L, a traveling control unit (not shown) that controls the traveling drive unit, and the telescopic control unit and the telescopic control unit that are operatively connected to the traveling control unit by wire or wirelessly. advance and retreat The control unit and the operating unit may be common or separate. A pair of running wheel units R are provided at the lower ends of each pair of columns 10, and a pair of running rails L are laid on both sides of the width of the deck replacement section.

[0030] In this way, the construction machine M consisting of a telescopic support structure is installed immediately after each deck slab removal position (in the direction of construction progress) in the deck slab replacement section via a traveling mechanism RL, as shown in Figure 1, and one end of a pair of conveying guide rails 2 is positioned above each deck slab removal / installation position as the conveying start or end, and the other end is positioned at the deck slab delivery / transport destination as the conveying end or conveying start.

[0031] When carrying out highway deck replacement work, the construction machine M is installed immediately after the first deck removal position in the deck replacement section via the traveling mechanism RL, and one end of the pair of conveying guide rails 2 is positioned above the first deck removal position as the conveying start point, and the other end is the conveying end.

[0032] After cutting the existing deck slab in the deck replacement section to a predetermined size, first, each of the columns 10 of the construction machine M is contracted simultaneously by comprehensive control of the entire columns 10, and by contracting the entire telescopic column structure, the pair of conveying guide rails 2 is lowered while maintaining the horizontal, and the fasteners 4 are connected to the cut existing deck slab at the conveying start ends of the pair of conveying guide rails 2. Next, each of the columns 10 of the construction machine M is extended simultaneously by comprehensive control of the entire columns 10, and by extending the entire telescopic column structure, the pair of conveying guide rails 2 is raised while maintaining the horizontal, and the cut existing deck slab is lifted with the fasteners 4. Then, the fasteners 4 are connected to the pair of conveying guide rails 2 via the conveying guide 3. of The existing deck slab that has been cut is removed by moving horizontally from the start point of the transfer to the end point. By repeating this process of removing and removing the existing deck slab, the existing deck slab at the initial deck slab removal position is removed and removed.

[0033] After the existing deck slab is removed and carried out from the initial deck slab removal position, the other end of the pair of transport guide rails 2 is then set as the transport starting end and one end as the transport terminal, and a new deck slab is transported below the transport starting end. After the new deck slab is transported, the entire telescopic support structure is contracted to lower the pair of transport guide rails 2 while maintaining the horizontality, and the fasteners 4 are connected to the new deck slab at the transport starting end of the pair of transport guide rails 2. Next, the entire portal structure is extended to raise the pair of transport guide rails 2 while maintaining the horizontality, and the new deck slab is lifted by the fasteners 4. The fasteners 4 are then used to move the pair of transport guide rails 2 horizontally via the transport guides 3 from the transport starting end to the transport terminal, thereby transporting the new deck slab. After the new deck slab is delivered, the entire telescopic support structure is contracted while maintaining the horizontality, to lower the pair of transport guide rails 2, and the new deck slab is installed (erected) at the removal position (main girder) of the existing deck slab. By repeating this process of transporting and installing the new deck, the new deck will be transported and installed in the same location as the original deck was removed.

[0034] Thereafter, the construction machine M is moved by its traveling mechanism to a position immediately after each deck removal position, and the process of removing and carrying out the existing deck and the process of carrying in and installing the new deck are repeated.

[0035] In this case, in the case of a normal flat elevated road, there is no step at the joint of a pair of running rails L, but in the case of a slope such as a bridge, multiple divided rails L1 are installed horizontally with filler material interposed on the lower side of the construction surface, resulting in a step G between each divided rail L1. In such a case, the movement of the construction machine M between each deck slab removal position is carried out by the coordinated operation of the construction machine M and the traveling mechanism RL, as shown in Figure 4.

[0036] As shown in step 1 of Figure 4 (1), while the deck replacement work is being carried out at the previous deck replacement position, the construction machine M is installed immediately behind the previous deck replacement position via a pair of traveling rails L. As mentioned above, the pair of traveling rails L is made up of a plurality of divided rails L1, and each has a length that is approximately the same as or slightly longer than the distance between the front end of each traveling wheel unit R on the front side of each pair of pillars 10 adjacent to each other at the front and rear of the construction machine M, i.e., the telescopic pillar structure, and the rear end of each traveling wheel unit R on the other rear side. Therefore, on each traveling rail L, the construction machine M is configured so that each traveling wheel unit R of one of each pair of pillars 10 comes into contact with a step G ahead (in the direction of travel of the construction machine M), while the other two traveling wheel units R have a distance to travel before reaching the step G ahead of them. Therefore, when the construction machine M is placed on a pair of running rails L immediately after the previous deck replacement position, as shown in Figure 4 (1), each running wheel unit R of each of the middle pillars 10 of the three pairs of pillars 10 of the construction machine M will collide with the step G between the next divided rail L1 on each divided rail L1 immediately after the deck replacement position, and the running wheel units R of each rear pillar 10 will be at the end of the divided rail L1 immediately after the deck replacement position on the deck replacement position side, so there is still a distance to travel to the forward step G, and each running wheel unit R of each front pillar 10 will be on the next divided rail L1 and just before the next divided rail L1, so there is still a distance to travel to the forward step G (the length of the running wheel unit R), but the construction machine M cannot move forward to the next deck replacement position in this state.

[0037] First, as shown in Fig. 4(2), the columns 10 of this construction machine M are controlled separately, and the entire telescopic column structure is supported by two columns 10, in this case the front columns 10 and the rear columns 10. By contracting the remaining column 10, that is, the middle column 10, this one running wheel unit R is raised to a height that exceeds the step G. From this state, as shown in Fig. 4(3), the other two pairs of running wheel units R, one at the front and one at the rear, are used to move the construction machine M on each running rail L, so that the middle pair of running wheel units R straddles and jumps over the step G. In this case, the construction machine M travels on the pair of running rails L for the length of the pair of running wheel units R. As a result, the middle pair of running wheel units R is moved onto the end of each divided rail L1 before the next divided rail L1. At this time, the running wheel units R of each rear support column 10 are in a midpoint between the ends of each divided rail L1 immediately after the deck replacement position, with some travel distance remaining before the front step G, and each running wheel unit R of each front support column 10 on the next divided rail L1 collides with the step G between the next divided rail L1. Here, as shown in FIG. 4 (4), each intermediate support column 10 is extended to place each intermediate running wheel unit R on the next divided rail L1. Next, each support column 10 of this construction machine M is supported by each intermediate support column 10 and each rear support column 10 by separately controlling each column 10, and by contracting each front column 10, each running wheel unit R of these columns 10 is raised to a height that exceeds the step G. From this state, the other intermediate and rear running wheel units R move the construction machine M on each running rail L, causing the front pair of running wheel units R to straddle the step G and place each front running wheel unit R on the next divided rail L1. Following this, in a similar manner, each rear running wheel unit R straddles the step G and jumps over it, placing each rear running wheel unit R onto the next divided rail L1, and moving the entire construction machine M from the previous divided rail L1 to the next and further divided rails L1.

[0038] Even when there is a slope such as in a bridge, and a step G occurs between the multiple divided rails L1, the construction machine M is moved to just after each deck slab removal position by the coordinated operation of the telescopic support structure and traveling mechanism RL that make up the construction machine M. Then, at each deck slab removal position, the process of removing and carrying out the existing deck slab and the process of carrying in and installing the new deck slab are repeated.

[0039] Figure 5 shows an example of construction on a bridge as a concrete example of this method using construction machine M.

[0040] In Figure 5, the construction machine M is a substitute for a conventional gantry crane, and instead of a crane, it uses three pairs of telescopic columns 10 as a lifting mechanism, combined with a steel beam 11 connecting these pairs of columns 10, a rail track (transport guide rail 2, movable guide rail) arranged between these pairs of columns 10, a movable beam (transport guide 3) that moves along this rail track, a cargo hook (fastener 4), and a counterweight 7. Then, a brace column 5 is added depending on the construction conditions, site conditions, and the strength of the steel beam 11.

[0041] Each pair of columns 10 is equipped with two hydraulic lifters whose column length can be adjusted by adjusting the hydraulic pressure. The machine body 1 is comprised of three hydraulic lifters connected by steel beams 11 at 6-meter intervals. Typically, a hydraulic lifter consists of two columns and a beam connecting the columns, which constitutes a basic structural unit (one unit). Originally, hydraulic lifters are intended for single-unit use; even when two or more are used simultaneously, they are not connected and integrated into a single, unified, and controlled system. This construction machine uses three hydraulic lifters arranged horizontally and interconnected to operate them simultaneously or independently, achieving a deck replacement method not possible with conventional gantry cranes. Furthermore, the lower parts of these columns 10 are equipped with wheel structures (running wheel units R) that allow the machine to travel on dedicated rails (running rails L), as described below.

[0042] The steel beams 11 are paired, and are fixed in two parallel rows between each pair of columns 10 arranged on the same side of the three pairs of columns 10, connecting each pair of columns 10. These steel beams 11 are parallel to the dedicated rails (traveling rails L) described below, and both ends protrude a predetermined length in the extension direction from the fixed positions of the pairs of columns 10 at both ends; in this case, one end has a length of 8 m or more. Here, one end of the steel beam 11 protrudes 8 m in the extension direction of the steel beam 11 from each pair of columns 10 at one end, and the other end protrudes 7 m in the extension direction of the steel beam 11 from each pair of columns 10 at the other end. A pair of conveyor guide rails 2 for the conveyor guide 3, a pair of movable guide rails 71 for the counterweight 7, and a pair of cheek support guide rails 6 for the pair of cheek support columns 5 are arranged on this pair of steel beams 11 as rail tracks. In this case, conveying guide rails 2 for the moving beams, i.e., the conveying guides 3 described above, are installed along the upper surface of each steel beam 11 over approximately the entire length. A pair of moving guide rails 71 for the counterweight 7 is installed on each outer side of each steel beam 11 between a pair of support columns 10 at both ends. Cheek guide rails 6 for each cheek support column 5 are installed only on the underside of one protruding end of each steel beam 11, in this case, the end side that is rearward in the direction of travel of the construction machine M.

[0043] The moving beam is a facility for moving the load hooks, i.e., the aforementioned conveying guide 3, and has a length that allows it to cross between the rail tracks of a pair of steel beams 11, in this case, between a pair of conveying guide rails 2, and has wheel structures at both ends that can engage with each conveying guide rail 2 of each steel beam 11. In this case, the moving beam has guide rollers journaled at both ends of its underside, and is arranged movably on the pair of conveying guide rails 2. In addition, in this case, the moving beam serves as a guide rail that engages and guides the guide rollers of the load hooks, which will be described later, over almost the entire length in the direction in which it extends.

[0044] The cargo hook is a facility for lifting a load, i.e., the fastener 4 described above, and is composed of a hook 41 that can be engaged with the deck slab, a rope-like member 42 such as a wire for suspending this hook 41 from the movable beam, and a guide roller 43 with a gripping structure that engages this rope-like member 42 with the guide rail of the movable beam and allows it to move along the movable beam, and is suspended from the moving beam by the guide roller with a gripping structure.

[0045] The counterweight 7 is a piece of equipment that adjusts the center of gravity of the construction machine M and prevents the construction machine M from tipping over, and is mounted on a moving beam 70 for the counterweight 7 and is installed so that it can travel on a pair of moving guide rails 71. As will be described later, in this construction machine M, each pair of columns 10 is raised from a pair of traveling rails L, and this action changes the combination of each pair of columns 10 that support the machine body 1, so the position of the counterweight 7 can be changed toward both ends of the machine body 1 (front and rear directions) in accordance with the movement of the moving beam on the rail track.

[0046] The pair of support struts 5 are equipment for reducing the bending moment acting on the overhanging (rear) ends of the pair of steel beams 11 during lifting operations by this construction machine M, and are composed of two hydraulic lifters whose column length can be extended or retracted by adjusting the hydraulic pressure, and these support struts 5 aim to reduce the weight of the pair of steel beams 11. Each support strut 5 has a guide roller at its upper end with a gripping structure that can engage with each support strut guide rail 6 on one end side (overhanging portion) of the pair of steel beams 11, and is suspended movably along one end side of the pair of steel beams 11 via each support strut guide rail 6. The lower end of each support strut 5 is installed directly on the main girder of the elevated road or bridge.

[0047] Although the telescopic control unit, travel control unit, operation unit, etc. of the machine body 1 are not specifically shown, they are integrated into the same system. The operator operates this system using a common operation unit. By operating this operation unit, all of the struts 10 of the construction machine M can be extended and retracted simultaneously, and the extension amount of each strut 10 can be set relatively so that each strut 10 can be extended and retracted uniformly or unevenly.

[0048] Then, to enable this construction machine M to move over the existing deck, a pair of running rails L consisting of a dedicated rail and the aforementioned multiple split rails L1 are temporarily installed horizontally on the existing deck. In this case, each split rail L1 is 8m long, and each pair of running rails L that make up one track is made up of three split rails L1, with the total length of each running rail L installed at one time being 24m. Each split rail L1 is installed so that it is horizontal. When applied to bridges with a slope in the longitudinal direction, the bottom of each split rail L1 on the lower side of the construction surface is raised with filler material, and each split rail L is installed in a horizontal position.

[0049] Using such a construction machine M, the present method is carried out as follows.

[0050] First, as shown in Figure 5 (1), a pair of running rails L is laid on the existing deck of the bridge in the direction of the bridge axis, immediately after the first deck removal position in the deck replacement section. A construction machine M is then assembled on this pair of running rails L, immediately after the first deck removal position, with one end of the pair of conveying guide rails 2 positioned above the first deck removal position as the conveying start point, and the other end positioned above the deck removal / import destination as the conveying end.

[0051] Next, after cutting the existing deck slab in the deck replacement section to a predetermined size, the counterweight 7 is moved on the pair of movable guide rails 71 of the movable beam 70 to the front of the machine body 1 (forward in the direction of travel of the construction machine), in this case, onto the pair of columns 10 at the other end (forward in the direction of travel of the construction machine M). Next, each column 10 of the construction machine M is simultaneously contracted by comprehensive control of the entire columns 10, and the entire telescopic column structure is contracted, thereby lowering the pair of conveying guide rails 2 while maintaining the horizontality, and the fasteners 4 are connected to the cut existing deck slab at the conveying start end of the pair of conveying guide rails 2. Next, each column 10 of the construction machine M is simultaneously extended by comprehensive control of the entire columns 10, and the entire telescopic column structure is extended, thereby raising the pair of conveying guide rails 2 while maintaining the horizontality, and the cut existing deck slab is lifted by the fasteners 4. The fasteners 4 are then moved horizontally on the pair of conveying guide rails 2 via the conveying guide 3 from the conveying start end to the conveying end, and the cut existing deck slab is carried out at the conveying end. In this case, the deck slab is removed from the final destination below the end of the transport line, where a deck slab transport vehicle is waiting. The existing deck slab is loaded onto the transport vehicle, which then transports it away. By repeating this process of removing and transporting the existing deck slab, the existing deck slab is removed and transported from the initial deck slab removal location.

[0052] After removing and transporting the existing deck slab from the initial deck slab removal position, work such as cleaning the bridge girders is carried out, and the new deck slab is transported and installed at the initial deck slab removal position. In this case, the other end of the pair of transport guide rails 2 is set as the transport starting point, and one end is set as the transport terminal, and the new deck slab is transported below the transport starting point. After transporting the new deck slab, the entire construction machine M is contracted to lower the pair of transport guide rails 2 while maintaining the horizontality, and the fasteners 4 are connected to the new deck slab at the transport starting points of the pair of transport guide rails 2. Next, the entire construction machine M is extended to raise the pair of transport guide rails 2 while maintaining the horizontality, and the new deck slab is lifted by the fasteners 4. Then, the new deck slab is brought in by moving the pair of transport guide rails 2 horizontally from the transport start point to the transport end point via the fasteners 4 and the transport guide 3. After the new deck slab is brought in, the pair of transport guide rails 2 is lowered by contracting the entire telescopic support structure while maintaining it horizontal, and it is installed (erected) at the removal position (main girder) of the existing deck slab. By repeating this process of bringing in and installing the new deck slab, the new deck slab is brought in and installed at the initial deck removal position.

[0053] After the replacement of the deck at the first deck replacement position is completed in this way, the construction machine M moves to just after the next deck removal position by traveling on a pair of traveling rails L using three pairs of traveling wheel units R, and the process of removing and transporting the existing deck and the process of transporting and installing the new deck are repeated.

[0054] In this case, as shown in Figure 5 (2), first, a pair of support columns 5 are contracted by separate control and raised onto the bridge girder. Next, each support column 5 is moved 8 m forward in the direction of travel of the aircraft 1 along a pair of support column guide rails 6, whereupon each support column 5 is extended and reinstalled on the bridge girder.

[0055] Next, as shown in FIG. 5(3), by separately controlling each pair of support columns 10 of the construction machine M, the entire machine body 1 is supported by the front support columns 10 and the rear support columns 10, and by contracting the middle support columns 10, the middle running wheel units R are raised above the pair of running rails L to a height that exceeds the step G. From this state, the front and rear running wheel units R move the machine body 1 2 m on each running rail L, causing the middle pair of running wheel units R to straddle and jump over the step G. As a result, the middle pair of running wheel units R is moved onto the end of the previous divided rail L1 of the next divided rail L1. At this time, the running wheel units R of the rear support columns 10 are in a midpoint between the ends of the divided rail L1 immediately after the deck replacement position, and there is still a distance to travel before the step G ahead, so the running wheel units R of the front support columns 10 collide with the step G between the next divided rail L1 and the next divided rail L1. Here, the intermediate supports 10 are extended to place the intermediate running wheel units R on the next divided rails L1.

[0056] Next, as shown in FIG. 5 (4), the counterweight 7 is moved on the pair of movable guide rails 71 of the movable beam 70 to the rear of the machine body 1 (rear in the direction of travel of the construction machine), in this case, onto a pair of supports 10 at one end (rear in the direction of travel of the construction machine M). Next, by separately controlling each pair of supports 10 of the construction machine M, the construction machine M is supported by the middle supports 10 and the rear supports 10, and by contracting the front supports 10, the running wheel units R of these supports 10 are raised to a height that exceeds the step G. From this state, the other middle and rear running wheel units R move the construction machine M 2 m on each running rail L, and the front pair of running wheel units R straddles and jumps over the step G. Here, each front running wheel unit R is placed on the next divided rail L1.

[0057] Next, as shown in FIG. 5(5), the counterweight 7 is moved on a pair of movable guide rails 71 of the movable beam 70 to the front of the machine body 1 (forward in the direction of travel of the construction machine M), in this case, onto a pair of supports 10 at the other end (forward in the direction of travel of the construction machine M). Next, by separately controlling each pair of supports 10 of the construction machine M, the construction machine M is supported by each intermediate support 10 and each front support 10, and by contracting each rear support 10, each running wheel unit R of these supports 10 is raised to a height that exceeds the step G. From this state, the other intermediate and front running wheel units R move the construction machine M 4 m on each running rail L, and the rear pair of running wheel units R straddles and jumps over the step G. Now, as shown in FIG. 5(6), each rear running wheel unit R is placed on the next divided rail L1.

[0058] In this single cycle, the deck slab for 8m in the bridge axis direction is replaced and the construction machine M is moved. By repeating this cycle, construction of the entire bridge is completed.

[0059] This method using the construction machine M has three points in common with conventional gantry cranes: the basic configuration is two pairs of support columns 10, which are combined in multiple sets to support the machine body 1, these support columns 10 move on a rail track, and the lifting and moving of the deck slab is performed inside the machine body 1. As a result, it is possible to obtain the same technical benefits as conventional gantry cranes, such as (1) the lifting capacity is not affected by the width of the machine, (2) the suspended load does not pass outside of traffic regulations, (3) it can be applied to heights under overhead restrictions, and (4) the transport vehicle can be guided to the vicinity of the construction site.

[0060] In particular, this construction machine M uses hydraulic lifters for each pair of columns 10, and lifts materials by controlling the hydraulic cylinders inside the columns 10 to extend or retract the column length, so unlike conventional gantry cranes, it can raise and lower the deck slab without using a winding device. Furthermore, in the case of this construction machine M, when assembling the construction machine M, the steel beams 11 connecting the three pairs of columns 10 and the support columns 5 are leveled (STEP 1 in Figure 4(1)). When lifting the deck slab, all columns 10 are extended or retracted simultaneously by the same amount to maintain the steel beams 11 level. When the construction machine M is moving, any two of the three pairs of support columns 10 that make up the machine body 1 are fixed in their extension / retraction states, thereby stably maintaining the height of the steel beam 11. A pair of support columns 5 is selectively installed. From this state, when the remaining support column 10 is retracted, the base point for the retraction of this column becomes the steel beam 11, not the pair of running rails L, and each running wheel unit R at the bottom of each support column 10 can be lifted off the running rail L (STEP 2 in Figure 4(2)). In this state, the construction machine M can be moved horizontally, and each support column 10 at the step G passes through the step G between the divided rails L1 (STEP 3 in Figure 4(3)). This ensures applicability to bridges with longitudinal gradients, a problem faced by conventional gantry cranes. Furthermore, because this construction machine M is not equipped with a winding device, it is not considered a crane. Therefore, completion inspections are not required, and there are no restrictions on the running rail L installation process. As a result, after the construction machine M is moved in accordance with the progress of construction at each floor panel replacement position, each traveling rail L (each divided rail L1) remaining behind in the direction of travel of the construction machine M can be immediately moved forward. Therefore, by performing the removal and installation work of each traveling rail L simultaneously, the process can be shortened.

[0061] As explained above, this method using the construction machine M provides the following advantageous effects that were difficult to achieve with conventional mobile cranes or gantry cranes. (1) The construction machine M can be made smaller in width and height depending on the construction site, but this does not result in a decrease in the performance of lifting and transporting decks or a decrease in the work efficiency of deck replacement, making it ideal for single-lane construction on elevated roads, including bridges, and also for construction on bridges with headway restrictions. (2) The traveling mechanism RL uses a pair of traveling wheel units R and a pair of traveling rails L, and the pair of traveling rails L is made up of multiple divided rails L1, which are installed horizontally, and the construction machine M moves on the horizontal traveling rails L. Therefore, the presence or absence of a longitudinal gradient on the construction surface such as a bridge does not affect the risk of the construction machine M running away, and running away can be prevented by equipment other than outriggers, such as wheel brakes. On the other hand, there is no need to increase the power according to the gradient, as is the case when moving the construction machine M up a gradient with a conventional gantry crane. (3) The construction machine M has a work space inside, and the deck slab lifting and transporting operations are carried out within this space, so the suspended deck slab will not pass outside the regulated area, and the deck slab transport vehicle can be guided to the vicinity of the deck slab replacement construction site, allowing the deck slab replacement work to be carried out safely and efficiently. (4) Even if the work of removing and installing the traveling rail L is involved, the construction machine M does not have a winding device like a conventional gantry crane, and therefore the construction machine M is not a crane. Therefore, the work of removing and installing the traveling rail L can be performed as the same work in the form of repositioning, and there is no loss in the process of moving the construction machine compared to a mobile crane.

[0062] Therefore, this method using the construction machine M is significantly superior to conventional construction machines in terms of two site conditions, such as the scope and duration of traffic control required and the size of the applicable site, and can be a solution to reduce the negative impact that previous deck replacement work has had on society and the economy.

[0063] It should be noted that this embodiment is illustrated as an example of a deck replacement method and construction machinery used for expressway deck replacement work, but it goes without saying that this method and construction machinery can also be used for bridges on general roads in the same way, and will achieve the same effects as those described above. [Explanation of symbols]

[0064] М Construction machinery 1 aircraft 10 posts 11 Steel beam 2. Transport guide rail (rail track) 3 Transport guide (moving beam) 4 Fasteners (cargo hooks) 41 Hook 42 Cable-like member 43 Guide roller 5 Cheek support 51 Engagement portion 6 Cheek support guide rail (rail track) 7 Counterweight 70 Moving beam 71 Moving guide rail RL traveling mechanism R Traveling Wheel Unit L Running rail L1 Split Rail G Step

Claims

1. In a deck replacement method in which the existing deck in the section of a highway where the deck is to be replaced is removed from the main girder and a new deck is installed on the main girder, The machine body is constructed by connecting at least three pairs of columns that can be extended and retracted in the vertical direction with a predetermined interval between each column, and a pair of conveying guide rails is arranged between the upper parts of each of the columns with both ends in the longitudinal direction extending from each of the columns at both ends, and a telescopic column structure is used, which is configured by bridging each of the conveying guide rails and mounting fasteners that can be connected to the floor slab, and a traveling mechanism that travels the telescopic column structure on the existing floor slab, The telescopic support structure is installed immediately after the first deck removal position in the deck replacement section via the traveling mechanism, and one end of the pair of conveying guide rails is positioned above the first deck removal position as the conveying start end, and the other end side is positioned as the conveying end, After cutting the existing deck slab in the deck replacement section to a predetermined size, the entire telescopic support structure is contracted to lower the pair of conveying guide rails, and the fasteners are connected to the cut existing deck slab at the conveying start ends of the pair of conveying guide rails. The entire telescopic support structure is extended to raise the pair of conveying guide rails, and the cut existing deck slab is lifted with the fasteners. The fasteners are moved from the conveying start ends to the conveying end ends of the pair of conveying guide rails via the conveying guides, thereby transporting the cut existing deck slab. This process of removing and transporting the existing deck slab is repeated to remove and transport the existing deck slab from the initial deck slab removal position. After removing and transporting the existing deck slab from the initial deck slab removal position, the other end of the pair of conveying guide rails is set as the conveying starting end and one end is set as the conveying terminal end, and a new deck slab is transported below the conveying starting end, and then the entire telescopic support structure is contracted to lower the pair of conveying guide rails, and the fasteners are connected to the new deck slab at the conveying starting ends of the pair of conveying guide rails, and the entire telescopic support structure is extended to raise the pair of conveying guide rails and lift the new deck slab with the fasteners, and the fasteners are moved from the conveying starting ends to the conveying terminal ends of the pair of conveying guide rails via the conveying guide to transport the new deck slab, and after the new deck slab has been transported, the entire telescopic support structure is contracted to lower the pair of conveying guide rails and install it at the removal position of the existing deck slab, and this process of transporting and installing the new deck slab is repeated to transport and install the new deck slab at the initial deck slab removal position, Thereafter, the telescopic support structure is moved by the traveling mechanism immediately after each deck removal position, and the process of removing and carrying out the existing deck and the process of carrying in and installing the new deck are repeated. A deck replacement method characterized by:

2. A deck replacement method according to claim 1, wherein a pair of running wheel units and a pair of running rails are used for the running mechanism, the pair of running wheel units are provided at the lower ends of each pair of columns, the pair of running rails are laid on both sides of the width of the deck replacement section, and the telescopic support structure is placed on each of the running rails via each of the running wheel units and moved on each of the running rails.

3. In the case of a bridge or the like, when the deck replacement section has a gradient, a pair of running rails are configured with a plurality of divided rails having a length that is approximately the same as or slightly longer than the distance between the front end of each running wheel unit on the front side of each pair of adjacent support columns at the front and rear of the telescopic support structure and the rear end of each running wheel unit on the rear side of the other, and each of the divided rails is installed horizontally in the deck replacement section via filler material, and a step is formed between the joints of each divided rail, and when the telescopic support structure is moved on each of the running rails, when one of the running wheel units of each pair of support columns reaches the step, the other two 3. The deck slab replacement method according to claim 2, wherein each of the running wheel units has a travel distance remaining before reaching the step, and each time one of the running wheel units reaches the step, the other two units support the entire telescopic support structure, and by contracting the supports of the one running wheel unit, the one running wheel unit is raised to a height that exceeds the step, and from this state the other two running wheel units move the telescopic support structure on the running rails, so that the one pair of running wheel units straddles and overcomes the step.

4. A deck replacement method described in any one of claims 1 to 3, in which a pair of cheek support guides are arranged side by side on each end side extending from a pair of supports at one end of a pair of conveying guide rails, and a pair of cheek support posts are arranged that are engaged with each end side so as to be relatively movably connected via each cheek support post guide and are capable of expanding and contracting in the vertical direction, and each end side is supported by each cheek support post.

5. A construction machine used in the deck replacement method according to any one of claims 1 to 4, a body including at least three pairs of support columns each having a built-in telescopic drive unit that can be extended and retracted in the vertical direction, the support columns being connected with a predetermined interval between each pair of support columns; and a telescopic control unit that controls each of the telescopic drive units collectively or individually; a pair of conveying guide rails disposed between the upper portions of each pair of support columns, with both ends of the conveying guide rails extending from the support columns at both ends; a conveying guide disposed between the conveying guide rails and capable of advancing and retreating along the conveying guide rails; a forward / backward driving unit that drives the conveying guide to advance and retreat on the conveying guide rails; and a forward / backward control unit that controls the forward / backward driving unit; an operation unit that is operatively connected to the telescopic control unit and the forward / backward control unit by wire or wirelessly, and that is common to the telescopic control unit and the forward / backward control unit or that is separate from the telescopic control unit and the forward / backward control unit; A fastener mounted on the conveying guide and connectable to the deck slab; The present invention is configured to include: The pair of conveying guide rails are installed immediately after each deck removal position in the deck replacement section via a traveling mechanism, and one end of the pair of conveying guide rails is arranged above each deck removal / installation position as the conveying start end or conveying end, and the other end is arranged at the deck removal / import destination as the conveying end or conveying start end. A construction machine characterized by:

6. The running mechanism comprises a pair of running wheel units and a plurality of divided rails having a length approximately equal to or slightly longer than the distance between the front end of each running wheel unit on the front side of each pair of adjacent pillars at the front and rear of the body and the rear end of each running wheel unit on the rear side of the other, a pair of running rails that guide the pair of running wheel units, a running drive unit that drives the pair of running wheel units to run on the pair of running rails, a running control unit that controls the running drive unit, and an operating unit that is connected to the running control unit by wire or wirelessly, and is common to or separate from the telescopic control unit and the forward / backward control unit, wherein the pair of running wheel units are provided at the lower ends of each pair of pillars, and the pair of running rails are laid on both sides of the width of the deck replacement section.

7. A construction machine as described in claim 5 or 6, which is provided with a pair of cheek support posts supporting each end side extending from a pair of posts at one end of a pair of conveying guide rails, the pair of cheek support posts being telescopic posts with built-in telescopic drive units that allow them to extend and retract in the vertical direction, and a pair of cheek support guides are arranged side by side on each of the one end sides, and are arranged so that they can move along each of the one end sides via each of the cheek support guides.

Images