JP6942680B2 - Construction method of temporary bridge - Google Patents

Description

The present invention relates to a method of constructing a temporary bridge such as a temporary pier or a temporary gantry, and particularly absorbs a construction error of a support pile driven into the ground in advance, and extends a unitized substructure unit above the support pile. Regarding the construction method of the temporary bridge.

Steel materials such as steel pipes are used as support piles and support columns for temporary bridges.
In the construction of the substructure, after joining the support columns to the upper part of each support pile that was driven into the ground in advance, a flat joint material is placed between the adjacent support columns in the bridge axis direction or the bridge axis crossing direction. , A reinforcing material made of a brace material or the like is retrofitted (Patent Document 1).

Japanese Unexamined Patent Publication No. 2005-282280

The conventional temporary bridge construction technology has the following problems.
<1> Conventionally, each support column is individually suspended and connected to the corresponding support pile, and the post-installation work of the beam material is also suspended at the site, so the workability at the site is poor and the overall construction period is prolonged. There is a problem that the construction cost is also high.
<2> It is extremely difficult to drive a support pile while maintaining verticality. If the support pile is displaced from the normal position or tilted and driven, it is technically difficult to eliminate the construction error of the support pile.
Therefore, the larger the construction error of the support pile, the more time and labor it takes to assemble the substructure, which is a factor that prolongs the construction period as a whole.
<3> In order to attach a reinforcing material between a plurality of adjacent support columns, a mounting piece called a gusset is attached at a predetermined height on the peripheral surface of each of the standing support columns by on-site welding and reinforced via a gusset. We are installing flat joints and brace materials that make up the material.
Therefore, not only the welding equipment becomes large-scale, but also the welding work at a high place and the attachment work of the girder material, the beam material, etc. are not only inferior in workability but also in ensuring the safety of the operator.
Furthermore, after the temporary bridge is dismantled, the gusset is welded, so the temporary materials such as support columns cannot be reused as they are.
<4> In order to weld and fix the flat end surface of the gusset to the curved outer peripheral surface of the support column, advanced welding technology by a qualified person is required, and after welding, X-rays, ultrasonic waves, etc. are applied. Inspection of the welded part used is required. In the current situation where there is a serious shortage of workers, proposals for alternative technologies for on-site welding are desired.
<5> A method has been proposed in which a unitized substructure unit is mounted on a support pile at the site.
This method is based on the premise that the existing support piles are driven according to the design dimensions, and if there is a construction error in the existing support piles, the substructure unit manufactured in advance according to the design dimensions will be accurately manufactured. Cannot be assembled.
It is also possible to individually manufacture the substructure unit according to the construction error of the support pile, but in order to wait for the completion of the support pile placement and manufacture the substructure unit, the waiting time until the substructure unit is brought into the site. It takes a long time and the construction period becomes long.

The present invention has been made in view of the above points, and an object of the present invention is to provide at least one method for constructing a temporary bridge.
<1> Efficient construction can be performed without being affected by construction errors of support piles, and the construction period can be significantly shortened.
<2> Work safety can be ensured by reducing aerial work at the site.

The present invention is a construction method of a temporary bridge constructed by extending a support column on an upper part of a support pile, in which a process of driving a plurality of support piles into the ground and a pile head of the support pile at a design height. A process of cutting, a process of grounding a substructure unit having a gate shape including a plurality of support columns and a transverse reinforcing material located between the plurality of support columns, and a process of lifting and supporting the grounded substructure unit. In the process of extending the columns to the existing support piles and laying the substructure unit in the ground, the intervals between the plurality of support columns are set between the existing support piles so as to correct the construction error of the support piles. It is adjusted in advance according to the pile head spacing.
Further, the present invention is a method of constructing a temporary bridge in which support columns are extended above the support piles, and a step of driving a plurality of support piles into the ground and a design height of the pile heads of the support piles. The process of cutting to, the multiple support columns, the cross-reinforcing material located between the multiple support columns, and the cross-reinforcing members that are slidably attached horizontally to both ends to hold the support columns. The process of laying a gate-shaped substructure unit including a clamp device that detachably connects the support column and the transverse reinforcing material, and extending the support column of the suspended substructure unit to the existing support pile. In the process of assembling the substructure unit, the clamp device is slid and adjusted so that the distance between the plurality of support columns is set so as to correct the construction error of the support pile. It is to be adjusted in advance to the head spacing.
In another embodiment of the present invention, the substructure unit further provides a girder member erected between the heads of a plurality of support columns and an adjusting plate interposed between the heads of the plurality of support columns and the girder member. The adjusting plate includes a slide plate interposed between the heads of a plurality of support columns and a girder member , a positioning protrusion projecting from the lower surface of the slide plate so as to accommodate the support column, and an end portion of the slide plate. Attaching a plurality of support columns to the girder via an adjusting plate so as to correct the construction error of the support pile in the process of grounding the substructure unit having a plurality of elongated holes formed nearby. The position is adjusted in the crossing direction of the bridge axis so that the distance between the plurality of support columns is adjusted in advance to the distance between the pile heads of the existing support piles.
In another embodiment of the present invention, the clamp device is provided with a substrate that can be exteriorized on a peripheral surface of a part of a support column, and is projected on the back surface of the substrate and is connected to an end portion of a transverse reinforcing member by a bolt so as to be movable back and forth. The gusset and the mounting bracket on the back side of the board are pivotally supported via a support shaft, and a plurality of holding arms having a length that can be externally attached to the support pillar and the tip of the holding arm are tightened. A type may be provided in which a tightening means is provided, and the substrate of the clamp device and a plurality of holding arms are held and fixed from the side of the support column to the entire circumference.
In another embodiment of the present invention, the clamping device comprises a combination of a half-circumferential clamp fitting and an auxiliary half-circumferential clamp fitting, and the half-circumferential clamp fitting is provided on a substrate that can be exteriorized as a part of a support column and a back surface of the substrate. , Can be opened and closed horizontally via a gusset that is freely bolted to the end of the cross-reinforcing material and a pair of support shafts vertically arranged on the mounting bracket on the back side of the board. It is provided with a pair of holding arms that are supported and have a length that allows the half circumference of the support pillar to be exteriorized, and a tightening means for tightening the tips of the pair of holding arms. It is pivotally supported so that it can be opened and closed horizontally via a board that can be exteriorized and a pair of support shafts vertically arranged on the mounting bracket on the back side of the board, and the half circumference of the support pillar can be exteriorized. It is provided with a pair of holding arms having a length and a tightening means for tightening the tips of the pair of holding arms, and supports the half-circumferential clamp metal fitting, the substrate of the auxiliary half-circumferential clamp metal fitting, and the pair of holding arms. It may be a type that is held and fixed from both sides to the entire circumference.
In another embodiment of the present invention, the support pile or support column can be applied to any one of a steel pipe, a column material, and an H-section steel.

The present invention has at least one of the following effects.
<1> Not only the substructure unit is constructed by grounding, but also the spacing between multiple support columns is adjusted in advance according to the pile head spacing of the support piles when the substructure unit is grounded. In addition to being able to construct efficiently without being affected by the construction error of the support piles, it is possible to significantly shorten the construction period compared to the conventional construction method because the substructure unit that has been grounded is assembled.
<2> By using the substructure unit that has been grounded at the site, the aerial work and welding work at the site can be significantly reduced, and the work safety is significantly improved.
<3> When a clamp device is used as a means for fixing to a support column, even a general worker without special skills can easily absorb the construction error of the support pile and firmly connect the support column and the transverse reinforcing material. Therefore, welding work and welding inspection can be eliminated when the substructure unit is grounded on site.
Therefore, even in the current situation where there is a serious shortage of workers, the substructure unit can be efficiently grounded and constructed.
<4> When the clamp device is used, it is possible to accurately match the pile head spacing of the existing support pile by adjusting the spacing between the support columns using the elongated holes when the substructure unit is grounded.
<5> The clamp device can be applied not only to known steel pipes but also to various known steel materials such as column materials and H-shaped steels, and is highly versatile.

Model diagram of the temporary bridge Arrow view from II-II in FIG. Perspective view of cross-sectional reinforcement Perspective view of the clamp device Top view of the clamp device with some parts omitted An explanatory diagram of the construction method of the temporary bridge, (A) is an explanatory diagram of the driving process of the support pile, (B) is an explanatory diagram of the cutting process of the pile head of the support pile, and (C) and (D) are substructure units. Explanatory drawing of the assembly process of Explanatory drawing of the groundwork process of the substructure unit Explanatory drawing of the substructure unit Explanatory drawing of the substructure unit according to the second embodiment Assembly drawing of support columns and girders using adjustment plates Explanatory drawing of the connection part of the support column and the girder material In the explanatory view of the clamp device according to the third embodiment, (A) is a plan view before being fixed to the support column, and (B) is a plan view after being fixed to the support column. In the explanatory view of the clamp device according to the fourth embodiment, (A) is a plan view before being fixed to the support column, and (B) is a plan view after being fixed to the support column. Top view of the clamp device according to the fifth embodiment

Examples of the present invention will be described in detail with reference to the drawings below.
[Example 1]
<1> Outline of Temporary Bridge Explaining the temporary bridge illustrated in FIGS. 1 and 2, the temporary bridge has a substructure 11 and a superstructure 12.
The substructure 11 is adjacent to at least the support column 20 extending from the support pile 10 erected on the ground G and the cross-reinforcing member 40 erected via the clamp device 30 in the bridge axis crossing direction of the adjacent support columns 20. It has a longitudinal reinforcing member 50 erected in the longitudinal direction of the bridge axis of the support column 20.
The superstructure 12 has at least a plurality of lining materials 14.

The support pile 10 or the support column 20 is composed of a steel pipe, an H-shaped steel, and a column (box steel).
In this example, a case where the support pile 10 and the support column 20 are steel pipes having the same diameter will be described.

<2> Substructure unit In the present invention, when constructing a temporary bridge, a gate-shaped lower portion including a plurality of support columns 20 and a transverse reinforcing member 40 erected between the plurality of support columns 20 and 20 via a clamp device 30. The construction unit 50 is grounded (land-assembled) near the site, but when the substructure unit 50 is grounded, the dimensions are adjusted in advance so that the construction errors of the existing support columns 10 and 10 can be absorbed. ..
The main temporary materials used in the construction will be described in detail below.

<3> Cross-sectional reinforcing material The cross-sectional reinforcing material 40 is a reinforcing material erected in the direction across the bridge axis of adjacent support columns 20, and a known rigid structural beam can be applied.
Clamping devices 30 are attached to both ends of the transverse reinforcing member 40, and can be connected to the support columns 20 via the clamping devices 30.

Explaining the transverse reinforcing member 40 illustrated in FIGS. It has a brace material 42, and a mounting plate 43 arranged at a confluence of an end portion of the horizontal joint member 41 and an end portion of the brace material 42.
The number of horizontal joints 41 and brace 42s to be installed is not limited to the illustrated form, and the horizontal joints 41 may be arranged in three or more rows in parallel.

<4> Longitudinal Reinforcing Material The longitudinal reinforcing material 60 is a reinforcing material erected in the direction of the vertical section of the bridge axis of the adjacent support columns 20.
Clamping devices 30 are attached to both ends of the longitudinal reinforcing member 60, and can be connected to the support columns 20 via the clamping devices 30.
The means for connecting the longitudinal reinforcing member 60 to the support column 20 is not limited to the clamp device 30, and known connecting means can be applied.

Explaining the longitudinal reinforcing member 60 illustrated in FIG. 1, the longitudinal reinforcing member 60 is a truss member 62 diagonally connected between a plurality of horizontal joints 61 arranged in parallel with each other and upper and lower horizontal joints 61, 61. And a mounting plate arranged at the end of each horizontal joint 61.
The longitudinal reinforcing material is not limited to the truss structure shown in the figure, and a known rigid structure beam can be applied.

<5> Clamp device The clamp device 30 is a mechanical connector capable of holding and releasing the support column 20, and has a length adjusting function.
Explaining with reference to FIGS. A pair of holding arms 34, 34 pivotally supported horizontally via a pair of supporting shafts 33, 53 arranged vertically on the back side, and a pair of holding arms 34, 34 tips. It is provided with a tightening means 35 such as a bolt for tightening the shaft, and has a symmetrical shape with respect to a center line passing between the pair of support shafts 33 and 33.

<5.1> Substrate The substrate 31 is a plate body capable of contacting a part of the support pillar 20 (less than half the circumference of the support pillar) in cooperation with the pair of holding arms 34, 34, and the curvature of the support pillar 20. It is curved according to.
Guide pieces 31c and 31c for regulating the vertical delusion of each holding arm 34 are projected on the left and right ends on the back surface 31a side of the substrate 31, and are between the pair of guide pieces 31c and 31c. Is formed with a slit 31d through which the base of each holding arm 34 can be inserted.
The pair of guide pieces 31c and 31c are not essential members and may be omitted.

<5.2> Gusset The gusset 32 is a connecting plate for connecting the clamp device 30 to the ends of the reinforcing members 30 and 40, and the clamping devices 30 are connected to the ends of the reinforcing members 30 and 40 via a plurality of mounting bolts 36. It is connected.
In this example, the support brackets 37 for pivotally supporting each of the holding arms 34 are projected from the substrate 31, but the pair of support brackets 37 may be fixedly provided on both side surfaces of the gusset 32.

<5.3> Holding arms The pair of holding arms 34, 34 is a plate having a total length that can surround the entire circumference of the support pillar 20, and is curved according to the curvature of the support pillar 20. The single body of the holding arm 34 has a total length that can surround the half circumference of the support pillar 20.
Reinforcing ribs 34a and 34b are attached to the back side of each holding arm 34.
The base end of the reinforcing rib 34a, which has a band shape curved in an arc shape along the holding arm 34, is pivotally supported by the support bracket 37 via the support shaft 33, and when the pair of holding arms 34, 34 are closed. The holding arms 34, 34 are positioned on the extension of the substrate 31.
The tip of each holding arm 34 is bent outward at a right angle, and a joint piece 34c is formed at the bent portion. Bolt holes 34d are formed in the joint pieces 34c, and by abutting the joint pieces 34c and 34c via the tightening means 35 and tightening the pair of joint pieces 34c and 34c, the pair of holding arms 34 and 34 press the outer peripheral surface of the support column 20. It is possible to hold it.

<5.4> Reason for adopting a two-hinge structure for the clamp device In the clamp device 30, the two support shafts 33, 53 (two hinges) in which the base ends of the pair of holding arms 34, 34 are arranged at intervals. The structure) is pivotally supported, and a gusset 32 for connecting the end portion of the reinforcing member 30 (40) is provided at the center position on the back surface side of the substrate 31.

The two-hinge structure is adopted because the expansion angle of the pair of holding arms 34, 34 is increased so that the tips of the pair of holding arms 34, 34 do not collide with the support pillar 20, and the adjacent support pillars are adjacent to each other. This is because it is possible to set from the side of 20.

<5.5> Reason for joining the gusset to the center of the substrate The reason why the gusset 32 was joined to the center position on the back side of the substrate 31 is the weight balance of the clamp device 30 when the pair of holding arms 34, 34 are expanded. This is to keep evenly.

<5.6> Reason for allowing the clamp device to move forward and backward The clamp device 30 is attached so that it can move forward and backward (slide movement) in the horizontal direction with respect to the end portion of the transverse reinforcing member 40.
The reason why the clamp device 30 can be moved forward and backward is to prevent the clamp device 30 from colliding with the support column 20 when assembling, and to adjust the mounting length of the clamp device 30 on site when assembling to the support column 20. ..
In this example, a form in which an elongated hole 32a, which is a bolt hole, is formed laterally on the gusset 32 side is shown, but an elongated hole may be provided in the mounting plate 43 on the end side of the transverse reinforcing member 40.

<6> Connecting Structure of Clamping Device and Transverse Reinforcing Material Explaining with reference to FIG. 5, the gusset 32 of the clamping device 30 and the mounting plate 43 of the transverse reinforcing material 40 are arranged on the same line, and both plates 32, The clamp device 30 is freely moved back and forth to the end of the transverse reinforcing member 40 by sandwiching the plates 44 and 44 from both sides of the 43, inserting them into the elongated holes 32a, and screwing a plurality of mounting bolts 36.
The size of the clamp device 30 can be adjusted over the entire length of the elongated hole 32a.

[Construction method of temporary bridge]
Next, the construction method of the temporary bridge will be described.

<1> Drive-in process of support piles Explaining with reference to FIG. 6A, a plurality of support piles 10 are driven into the ground at predetermined intervals using a vibro machine, a down-the-hole hammer machine, or the like.
When driving the support pile 10, it is extremely difficult not only to maintain accurate verticality, but also to adjust the pile head to the design height.
Therefore, the pile head of the support pile 10 is driven so as to be positioned at a position several tens of centimeters higher than the normal position (design height).

<2> Pile head excision process FIG. 6B shows a case where the support pile 10 is driven in at an angle θ with respect to the vertical line to be driven.
The upper part of the support pile 10 is horizontally cut along the design height 10a of the pile head shown by the broken line, and the height of the support pile 10 (pile head) is corrected to the design height.
The construction error is grasped by measuring the equal intervals between the piles of the plurality of support piles 10 whose heights have been adjusted.

<3> Groundworking process of substructure unit As described in detail below, the dimensional adjustment of the gate-shaped substructure unit 50 is performed near the site to perform groundwork (land assembly).

<3.1> Horizontal placement of support pillars Explaining with reference to FIG. 7, a plurality of support pillars 20 and 20 are horizontally placed on the ground surface near the site.

<3.2> Installation process of cross-sectional reinforcing material A cross-sectional reinforcing material 40 with a clamping device 30 is installed between the support columns 20 and 20, and each clamping device 30 provided at the end of the cross-sectional reinforcing material 40 is attached to the supporting column 20. Hold it on the peripheral surface and fix it.

<3.3> Dimension adjustment process of substructure unit (adjustment of overhang length of clamp device)
As shown in FIG. 5, the clamp device 30 has a structure capable of sliding horizontally with respect to the transverse reinforcing member 40.
Therefore, in order to correct the construction error of the support pile 10, each clamp device 30 is moved forward and backward along the elongated hole 32a in the correction direction, and then a plurality of mounting bolts 36 are tightened and each clamp device 30 is slid. Fix it impossible.
That is, to adjust the protruding length of each clamping device 30 so that the distance L ₂ of the plurality of support posts 20 shown in FIG. 8 is fit pile head distance L ₁ of the existing support columns 20.
In this way, when the substructure unit 50 is grounded, the overhang length of the clamp device 30 is adjusted in advance according to the site dimensions.

<4> Assembling process of the substructure unit Explaining with reference to FIGS. 6 (C) and 6 (D), the substructure unit 50 which has been grounded according to the driving interval of the existing support piles 10 and 10 is already installed. It is lifted directly above the plurality of support piles 10 and 10 by a crane or the like, and each support pillar 20 is placed on the head of the corresponding support pile 10 and integrally joined.
As the joining means of the support pile 10 and the support column 20, known joining means such as bolt connection and welding can be applied.
Since the spacing between the plurality of support columns 20 and 20 constituting the substructure unit 50 is adjusted in advance so as to match the existing plurality of support piles 10 and 10, the support pile 10 can be simply suspended by suspending the substructure unit 50. Each support column 20 can be erected directly above the corresponding support pile 10 while absorbing the construction error.
When all the joining between the support pile 10 and the support column 20 is completed, the substructure unit 50 is separated from the crane or the like.

As described above, it is not necessary to perform the assembly work of the substructure unit 50 and the dimensional adjustment work of the substructure unit 50 at a high place.
If the substructure unit is individually manufactured at a factory or the like according to the dimensions of the site, the waiting time until the substructure unit is brought into the site is long and the construction period is lengthened. However, in the present invention, the substructure unit 50 is individually manufactured near the site. Since it is manufactured, the waiting time for the substructure unit 50 to be brought into the site is eliminated, and the construction period can be significantly shortened.

<5> Erecting Process of Longitudinal Reinforcing Material 60. Explaining with reference to FIG. 1, the longitudinal reinforcing material 60 is hung between a plurality of support columns 20 erected along the bridge axis direction of the temporary bridge.
The holding arms 34, 34 of each clamp device 30 provided at both ends of the longitudinal reinforcing member 60 are expanded in a fully open state, and each clamping device 30 is retracted to the inside of the longitudinal reinforcing member.
The longitudinal reinforcing member 60 lifted by a crane or the like is lifted, and the vertical reinforcing member 60 is lifted from the side of the support column 20 toward the bridge axis direction in the lateral direction (cross-bridge direction) so as to be located between the adjacent support columns 20 and 20. By moving in parallel, the holding arms 34, 34 of each clamping device 30 are held and fixed to the outer peripheral surface of the support column 20. The fixing work by each clamp device 30 is as described above.
Finally, the girder 13 is placed between the upper portions of the plurality of support columns 20 erected along the bridge axis crossing direction of the temporary bridge, and the construction of the substructure 12 is completed.

<6> Construction of superstructure The main girder 15 is erected above the plurality of girders 13 erected along the bridge axis crossing direction of the temporary bridge, and the plurality of lining plates 62 are laid above the main girder 15. Then, the superstructure 12 is constructed.
Each of the above steps is repeated to construct a temporary bridge having a predetermined total length.

<7> Dismantling and removal of the temporary bridge When dismantling the temporary bridge, the superstructure 12 and the substructure 11 are dismantled and removed by performing the reverse process described above.
When disassembling and removing the substructure 11, each clamp device 30 can be separated from the support column 20 by a simple operation, so that the clamp device 30 can be reused.

[Example 2]
Other examples will be described below, but in the description thereof, the same parts as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

<1> Substructure Unit 50 Other substructure units 50 will be described with reference to FIGS. 9 to 11.
The substructure unit 50 of this example includes a plurality of support columns 20 and a gate-shaped substructure unit 50 including a transverse reinforcing member 40 erected between the plurality of support columns 20 and 20 via a clamp device 30. The fact that the substructure unit 50 is grounded near the site is the same as in the previous embodiment 1, but in this example, the girder member 13 is laid between the heads of the plurality of support columns 20 and 20. The mounting positions of the heads of the plurality of support columns 20 and 20 with respect to the girder 13 are directed in the bridge axis crossing direction via the adjusting plate 70 which is configured and interposed between the heads of the plurality of support columns 20 and 20. It is configured to be adjustable.

<2> Adjusting plate The adjusting plate 70 has a positioning protrusion 72 projecting from the lower surface of the slide plate 71, and the head of the support pillar 20 is accommodated inside the positioning protrusion 72 to enable positioning.
The positioning protrusion 72 is a protrusion that restrains the movement of the head of the support column 20 in the horizontal direction, and may be a tubular body.
Further, a plurality of elongated holes 73 are formed near the end of the slide plate 71 along the longitudinal direction of the bridge shaft, and the circular bolt holes 13b and the elongated holes 73 formed in the lower flange 13a of the girder member 13 are positioned. It is possible to connect with the connecting bolt 74 after matching.
The mounting position of the adjusting plate 70 with respect to the girder member 13 can be adjusted over the entire length of the elongated hole 73, and the overall length of the elongated hole 73 is the adjustment distance of the mounting position of the support column 20.

<3> Groundwork of substructure unit When the substructure unit 50 is grounded, a process of laying a plurality of support columns 20 and 20 horizontally on the ground surface near the site and a clamp device 30 between the support columns 20 and 20 are provided. The step of installing the cross-sectional reinforcing member 40 and holding and fixing each clamp device 30 provided at the end of the cross-sectional reinforcing member 40 to the peripheral surface of the support column 20 and the step of adjusting the dimensions of the substructure unit 50 are as follows. This is the same as that of the first embodiment.

In this example, in the dimensional adjustment process of the substructure unit 50 by adjusting the overhang length of the clamp device 30, the girder between the heads of the plurality of support columns 20 while the adjusting plate 70 is attached to the head of each support column 20. A step of connecting the members 13 and a step of sliding and adjusting each adjusting plate 70 and connecting the members 13 to the girders 13 with connecting bolts 74 are added.
In this example, when Chigumi a substructure unit 50, each adjusting plate 70 to slide adjusting, adjust the distance L ₂ of the plurality of support posts 20 to the pile head distance L ₁ of the existing support columns 20.
The steps after the dimensional adjustment step of the substructure unit 50 are the same as those in the first embodiment.

<4> Effect of this example If the substructure unit 50 including the girder 13 is grounded as in this example, the horizontal work of the girder 13 at a high place becomes unnecessary.
Further, if the mounting position of the head of the support column 20 is simply adjusted with respect to the girder member 13, an annular flange is welded to the outer periphery of the head of the support column 20 and projected, and the length formed on the annular flange is formed. It is also possible to adjust the mounting position on the girder 13 through the holes.
In this method, it is necessary to perform welding work on each support column 20, and the annular flange becomes an obstacle when the support column 20 is reused.
By using the adjusting plate 70 as in this example, not only the welding work for the support column 20 can be eliminated, but also the support column 20 can be easily reused.
Further, since the adjusting plate 70 is only interposed between the head of the support column 20 and the girder member 13, it can be collected and reused as many times as necessary.

[Example 3]
In the first embodiment, the clamp device 30 that can be attached to the support column 20 having a circular cross section has been described, but the other clamp device 30 that can be attached to the support column 20 having a non-circular cross section will be described below.

<1> Clamping device The clamping device 30A illustrated in FIG. 12 describes a case where the support column 20 is a column material having a rectangular cross section, but H-shaped steel can also be applied.
The clamp device 30A of this example includes a flat plate-shaped substrate 31 that can be externally contacted on one side surface (one side) of the support column 20, and a gusset 32 that protrudes vertically in the center of the back surface of the substrate 31. A pair of support shafts 33, 33 vertically arranged on a pair of support brackets 37, 37 on the back side of the substrate 31 and a pair of support shafts 33, 33 are pivotally supported so as to be horizontally openable and closable. , L-shaped (clamp-shaped) bent pair of holding arms 34, 34, and a tightening means 35 such as a bolt for tightening the tips of the pair of holding arms 34, 34.

<2> Holding arms The pair of holding arms 34, 34 are plate materials for collaborating to surround and hold the entire circumference of the support pillar 20, and each holding arm 34 surrounds the half circumference of the support pillar 20. It has a possible total length and is bent into an L-shape (arm shape).
The base ends of the pair of holding arms 34, 34 are pivotally supported by the pair of support brackets 37, 37 via the pair of support shafts 33, 33.

<3> Clamping Method Using Clamping Device FIG. 12B shows a form in which the clamping device 30A is set and held from the side of one support column 20.
A clamp device 30A in an expanded state is arranged on the side of the support column 20, and a pair of holding arms 34, 34 are rotated around a support shaft 33 to be held by the peripheral surface of the support column 20 and joined. The clamp device 30A is fixed to the support column 20 by tightening between the pieces 34c and 34c with the tightening means 35.

In this example, one type of clamp device 30A can be used to attach to the support column 20 having a non-circular cross-sectional shape.

[Example 4]
FIG. 13 shows another clamp device 30B in which the pair of holding arms 34, 34 constituting the above-mentioned clamp device 30A are configured to be able to be folded in the middle.

<1> Clamping device In the clamping device 30B of this example, each holding arm 34 is divided into a latter half portion 34e and a front half portion 34f at a bending portion, and the overlapping portion at the ends of both half portions 34e and 34f is an intermediate support shaft. It is rotatably pivotally supported by 33a and can be folded in the middle.
The base of the latter half 34e of each holding arm 34 is pivotally supported by the support bracket 37 via the support shaft 33, and the joint pieces 34c formed at the tip of the first half 34f are abutted against each other via the tightening means 35. By tightening, the pair of holding arms 34, 34 can be held and fixed to the support pillar 20.

<2> Clamping Method by Clamping Device The clamping method to the support column 20 by the clamping device 30B in this example is the same as that in the third embodiment, and thus the description thereof will be omitted.

In this example, since the pair of holding arms 34, 34 constituting the clamp device 30B can be bent in the middle, the pair of holding arms 34, 34 can be easily wound around the support column 20.

[Example 5]
<1> Clamping device FIG. 14 shows another clamping device 30C.
The clamp device 30C of this example is composed of a half-circle clamp metal fitting 30a and an auxiliary half-circle clamp metal fitting 30b, and is composed of a total of four holding arms 34 and four support shafts 33, and a pair of butted holding arms 34. , 34 are fastened with two sets of tightening means 35 such as bolts.

<2> Half-circumferential clamp metal fittings The half-circumferential clamp metal fittings 30a have a flat plate-shaped substrate 31 that can be exteriorized on one side surface (one side) of the support column 20, and the half-circumferential clamp metal fittings 30a project vertically in the center of the back surface of the substrate 31. It is provided with a gusset 32 provided and a pair of holding arms 34, 34 pivotally supported so as to be horizontally openable and closable via a pair of support shafts 33, 33 vertically arranged on the back side of the substrate 31. ing.

<3> Auxiliary Half-Clamp Bracket The auxiliary half-circle clamp bracket 30b is vertically arranged on a flat plate-shaped substrate 31 that can be exteriorized on one side surface (one side) of the support column 20 and a support bracket 37 on the back side of the substrate 31. It is provided with a pair of linear holding arms 34, 34 that are pivotally supported so as to be opened and closed horizontally via a pair of support shafts 33, 53. The auxiliary half-circle clamp metal fitting 30b does not have a gusset.

<4> Clamping method using a clamping device When the support column 20 is made of H-shaped steel, a pair of packing materials 21 and 21 are used to seal the recessed space formed between the flange and the web.
FIG. 14 shows a form in which a half-circumferential clamp fitting 30a and an auxiliary half-circumferential clamp fitting 30b are sandwiched and held as a set from the left and right sides of one support column 20.
Both half-circumferential clamp metal fittings 30a and 30b in the expanded state are arranged on the left and right sides of the support pillar 20, and each of the holding arms 34 and 34 is held by the support pillar 20 half a circumference, and two sets of holding arms 34 and 34 are held. The clamp device 30C is completed by tightening the two abutting portions where the joining pieces 34c and 34c are butted with two sets of tightening means 35.
In this example, the case where the support column 20 is H-shaped steel will be described, but the support column 20 can also be applied to a column material.

G ... Ground 10 ... Support pile 10a ... Support pile design height 11 ... Temporary bridge substructure 12 ... Temporary bridge superstructure 13 ... Girder material 14 ... Cover Construction plate 20 ... Support pillar 30 ... Clamping device 30A to 30C ... Other clamping device 31 ... Board 31a ... Back side 32 of board ... Gasset 32a ... A pair of support shafts 34, 34 ... A pair of holding arms 34a ... Reinforcing ribs 34b ... Reinforcing ribs 34c ... Joint pieces 34d ... Bolt holes 35 ... Tightening means 36 ... Mounting bolts 40 ...・ Cross-section reinforcement 41 ・ ・ ・ Horizontal connecting material for cross-section reinforcement 42 ・ ・ ・ Brace material for cross-section reinforcement 43 ・ ・ ・ Mounting plate for cross-section reinforcement 50 ・ ・ ・ Substructure unit 60 ・ ・ ・ Longitudinal reinforcement 61・ ・ ・ Horizontal connecting member of vertical reinforcing material 62 ・ ・ ・ Brace material of vertical reinforcing material 70 ・ ・ ・ Adjustment plate 71 ・ ・ ・ Slide plate 72 of adjustment plate ・ ・ ・ Positioning protrusion 73 of adjustment plate ・ ・ ・ Adjustment plate Long hole 74 ・ ・ ・ Connecting bolt

Claims (4)

It is a construction method of a temporary bridge that is constructed by extending support columns above the support piles.
The process of driving multiple support piles into the ground,
The process of cutting the pile head of the support pile to the design height and
Multiple support columns, a cross-sectional reinforcing material located between the multiple support columns, and a cross-sectional reinforcing material that is slidably attached horizontally to both ends of the cross-sectional reinforcing material, and holds the support column to hold the support column and the cross-sectional reinforcing material. The process of assembling a substructure unit having a gate shape, including a clamp device that can be detachably connected to and from
It has a process of extending the support column of the substructure unit that has been lifted to the existing support pile.
A substrate on which the clamp device can be exteriorized on a part of the peripheral surface of the support column, a gusset that is projected from the back surface of the substrate and is connected to the end portion of the transverse reinforcing material with a bolt so as to be able to move forward and backward, and the back surface of the substrate. It is pivotally supported by a mounting bracket on the side so as to be openable and closable via a support shaft, and is provided with a plurality of holding arms having a length that can be externally attached to the support pillar, and a tightening means for tightening the tip of the holding arm. The substrate of the clamp device and a plurality of holding arms can be held and fixed from the side of the support column to the entire circumference.
In the process of assembling the substructure unit, the clamp device is slid and adjusted so that the distance between the plurality of support columns is adjusted in advance to the pile head distance of the existing support pile so as to correct the construction error of the support pile. Features,
Construction method of temporary bridge. It is a construction method of a temporary bridge that is constructed by extending support columns above the support piles.
The process of driving multiple support piles into the ground,
The process of cutting the pile head of the support pile to the design height and
Multiple support columns, a cross-sectional reinforcing material located between the multiple support columns, and a cross-sectional reinforcing material that is slidably attached horizontally to both ends of the cross-sectional reinforcing material, and holds the support column to hold the support column and the cross-sectional reinforcing material. The process of assembling a substructure unit having a gate shape including a clamp device that can be detachably connected to and from
It has a process of extending the support column of the substructure unit that has been lifted to the existing support pile.
The clamp device consists of a combination of a half-circle clamp bracket and an auxiliary half-circle clamp bracket.
A substrate on which the half-circle clamp metal fitting can be exteriorized as a part of a support column, a gusset that is projected from the back surface of the substrate and is connected to an end portion of a transverse reinforcing material with a bolt so as to be able to move forward and backward, and a gusset on the back surface side of the substrate. A pair of hugging arms and a pair of hugging arms that are pivotally supported horizontally and can be opened and closed via a pair of support shafts vertically arranged on the mounting bracket and have a length that allows the half circumference of the support column to be exteriorized. It is equipped with a tightening means for tightening the tip of the holding arm, and can fix the half-circumferential clamp fitting, the substrate of the auxiliary half-circumferential clamp fitting, and the pair of holding arms by holding them from both sides of the support column all around. ,
In the process of assembling the substructure unit, the clamp device is slid and adjusted so that the distance between the plurality of support columns is adjusted in advance to the pile head distance of the existing support pile so as to correct the construction error of the support pile. Features,
Construction method of temporary bridge. The substructure unit further includes a girder member erected between the heads of a plurality of support columns and an adjusting plate interposed between the heads of the plurality of support columns and the girder member , and the adjusting plate includes a plurality of adjusting plates. a slide plate which is interposed between the head and the spars of the support column, and a positioning projection which projects capable of accommodating the support column to the lower surface of said slide plate, a plurality of long formed near an end portion of said sliding plate In the process of assembling the substructure unit with holes, the mounting positions of a plurality of support columns with respect to the girder are oriented in the bridge axis crossing direction via the adjusting plate so as to correct the construction error of the support pile. The method for constructing a temporary bridge according to claim 1 or 2, wherein the distance between the plurality of support columns is adjusted in advance to match the distance between the pile heads of the existing support piles. The method for constructing a temporary bridge according to any one of claims 1 to 3 , wherein the support pile or support column is any one of a steel pipe, a column material, and an H-shaped steel.

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