JP2017190607A - Erection method of simple temporary bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an erection method of a simple temporary bridge capable of largely reducing construction cost by using general-purpose materials, and capable of simplifying the materials for constituting a superstructure of the simple temporary bridge.SOLUTION: A process of extending a manual-extending temporary girder 30 toward the bridge axial direction by connecting to an existing superstructure, a process of removing a side girth 32 while leaving a girder bearer 31 erected between head parts of a plurality of erected support piles 20 as it is and a process of assembling the superstructure by mounting a plurality of main girders 40 between the girder bearers 31 separated at an interval, are repeatedly executed by a span unit by using the manual-extending temporary girder 30 presenting a plane U shape having the girder bearer 31 with a pile guide cylinder 33 and a pair of detachably connected side girths 32.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for constructing a simple temporary bridge.

Patent Document 1 discloses a simple temporary bridge erection method in which a unitary pier panel is used and a temporary bridge and a temporary pier are preliminarily constructed by a cable-stretching facility before an upper work is erected.
Referring to FIGS. 8 and 9, conventionally, the following steps 1 to 4 are repeated for each span.
(1) Jetty panel flat ground laying process As shown in FIG. 8, a plurality of main girders 81 and receiving girders 82, etc. arranged in the vertical and horizontal directions are connected and assembled into a lattice shape, and a plurality of girder 82 are arranged in part A pier panel 80 having a rigid structure provided with a pile guide tube 83 is grounded on a flat surface.
(2) Pier Panel Installation Step As shown in FIG. 9, one end of a pier panel 80 suspended by a crane is connected to the front part of an existing pier panel 80a and extended.
At this time, the reaction strut 85 is erected on the existing superstructure, between the top of the reaction strut 85 and the extended pier panel 80, and between the top of the reaction strut 85 and the existing pier panel 80a. The cable stays 84 and 86 are connected to support the pier panel 80 horizontally.
(3) Support pile driving process The support pile 87 is driven by being inserted into each pile guide tube 83 at the front end of the pier panel 80 that has been handed over, and the head of the support pile 87 and the pile guide tube 83 are connected. A floor board 89 is laid on the upper surface of the jetty panel 80.
(4) Reinforcing material attachment process Reinforcing material 88 such as a horizontal connecting material or vertical brace material is suspended by a crane, the reinforcing material 88 is bridged between adjacent support piles 87, and the side ends of the reinforcing material 88 are welded. And fixed to the support pile 87.

Japanese Patent Laid-Open No. 10-46523

The conventional simple temporary bridge construction technique described above has the following problems.
<1> Since the unitized jetty panel 80 is directly loaded with the weight of heavy machinery such as a crane as well as the superstructure, the jetty panel 80 is a dedicated product manufactured with a strength that can withstand the load.
Therefore, the cost of the pier panel 80 per sheet becomes very high.
<2> As described above, the main girder 81 of the pier panel 80 is subjected to a large overload, and therefore it is necessary to firmly connect the end face of the base end of the main girder 81 and the front surface of the existing receiving girder 82. Therefore, the reinforcement cost of the connecting portion between the main beam 81 and the existing receiving beam 82 is increased.
<3> The pier panel 80 constituting the superstructure has to be continuously provided over the entire length of the simple temporary bridge, and the use of a large amount of the pier panel 80 is a cause of the increase in the construction cost.
<4> With the pier panel 80 being standardized, the length in the bridge axis direction cannot be changed on site.
When the length in the bridge axis direction is changed to a non-standard dimension, the pier panel 80 may be manufactured separately. However, since the manufacturing cost of the pier panel 80 is further increased, the length in the bridge axis direction is changed. The costs involved are very high.

The present invention has been made in view of the above points, and an object thereof is to provide the following method for constructing a simple temporary bridge.
<1> General-purpose materials can be used, and construction costs can be significantly reduced.
<2> Materials that make up the superstructure of a simple temporary bridge can be simplified.
<3> Excellent economy and responsiveness in changing the length in the bridge axis direction.

The present invention extends a superstructure ahead of an existing superstructure that is supported by a plurality of support piles, and supports piles on a pile guide tube attached to the superstructure while supporting the superstructure that has been extended by horizontal support means. Is a simple temporary bridge construction method,
A girder support member having a plurality of pile guide tubes, and a pair of side connecting members that are arranged in the orthogonal direction of the girder support members and are detachably connected to both ends of the girder support members via the pile guide tubes. Using multiple sets of hand-drawn temporary girders with a flat U-shape,
Connecting the base ends of the pair of side connecting members arranged in the direction of the bridge axis to the existing superstructure, and extending the hand-drawn temporary girder in the direction of the bridge axis;
After the support pile is erected by interpolating in the pile guide tube, the pair of side connecting materials are removed while leaving the girder support material erected in the crossing direction of the bridge axis between the heads of the plurality of support piles. Process,
A step of assembling an upper work by mounting a plurality of main girders between an existing hand-drawn temporary girder and a girder receiving material of the extended hand-drawn temporary girder,
The above-described plurality of steps are repeated for each span.
Further, according to the present invention, an upper work is extended in front of an existing super work supported by a plurality of support piles, and the extended super work is supported by a pile guide tube attached to the super work while being supported by a horizontal support means. It is a method of erection of a simple temporary bridge that is done by inserting a pile and standing up,
A girder support member having a plurality of pile guide tubes, and a pair of side connecting members that are arranged in the orthogonal direction of the girder support members and are detachably connected to both ends of the girder support members via the pile guide tubes. Assembling a hand-drawn temporary girder having a flat U-shaped shape,
After connecting and extending the hand-drawn temporary girder in front of the existing superstructure, supporting the hand-drawn temporary girder extended through the horizontal support means; and
Inserting the support pile by interpolating the pile guide cylinder of the hand-drawn temporary girder; and
A step of laying the girder support material of the hand-drawn temporary girder extended through the pile guide tube between the heads of the support piles in the bridge axis crossing direction;
A step of assembling an upper work by mounting a main girder between the existing hand-drawn temporary girder and the girder receiving material of the extended hand-drawn temporary girder;
Removing a pair of side tie members separated from the girder support material of the extended manual temporary girder,
The above-described plurality of steps are repeated for each span.
In another embodiment of the present invention, the pair of lateral connecting members removed are used to assemble a hand span temporary girder for the next span.
In another aspect of the present invention, the pile guide tube has a tube portion through which the support pile can be inserted, and a plurality of connecting ribs projecting along the bridge axis direction on the outer peripheral surface of the tube portion, A pair of side ties can be attached and detached via the connecting ribs.
In another aspect of the present invention, the horizontal support means of the hand-drawn temporary girder includes a reaction force column that is erected on the existing upper work, and a hand-drawn temporary beam that is extended with the existing upper work around the top of the reaction force support. The horizontal support means is used by being transferred in units of spans.

The present invention has at least one of the following effects.
<1> Since a simple temporary bridge can be constructed by using a plurality of sets (minor sets) of hand-drawn temporary girders, the use of a large number of dedicated jetty panels used in the conventional construction method can be omitted.
<2> Since a general-purpose steel material can be used for the main girder by using the hand-drawn temporary girder, the hand-drawn temporary girder can be assembled at a low cost.
<3> The hand-drawn temporary girder has a simple structure in which a pair of side connecting materials are connected to both ends of the girder support material, and the detachable side connecting material is repeatedly used as a constituent material of the hand-drawn temporary girder. As it can be used, the construction cost can be greatly reduced compared to the conventional method that uses a large number of unitized jetty panels.
<4> Since the side tie materials with different lengths can be easily replaced with the girder support material, the length of the bridge axis direction can be changed compared to the unitized dedicated pier panel used in the conventional construction method. Economical and responsiveness will be much better.
<5> Since the main girder can be placed and hung on the upper surface of a pair of girder support members, a connecting rib is projected on the side end surface of the main girder as in the conventional construction method, or many connecting pins and There is no need to reinforce the connecting part by connecting with a strength bolt or the like.
Furthermore, the girder is a simple structure with a pile guide tube attached to the end of the steel material.
Therefore, the structure of the girder receiving material and the main girder constituting the superstructure of the simple temporary bridge can be simplified.

Explanatory drawing of the construction method of the simple temporary bridge concerning the present invention Perspective view of hand-drawn temporary girder used for construction Side view of the simplified temporary bridge showing the horizontal installation process of the hand-drawn temporary girder in the explanatory diagram of the method of installing the simplified temporary bridge Side view of the simple temporary bridge, showing the process of erecting the support pile in the explanatory diagram of the method of erection of the simple temporary bridge Side view of the simplified temporary bridge, showing the construction process of the main girder and floorboard, with an explanatory diagram of the method for constructing the simplified temporary bridge Plan view of FIG. 5 with a part omitted Side view of the simplified temporary bridge showing the process of moving the horizontal support means and the process of removing the side ties in the explanatory diagram of the method of erection of the simplified temporary bridge Perspective view of pier panel Explanatory drawing of a conventional simple temporary bridge construction method using pier panels

  Hereinafter, the present invention will be described in detail with reference to the drawings.

<1> Materials Used for Simple Temporary Bridge Construction materials used for the construction of the simple temporary bridge will be described with reference to FIG.
The simple temporary bridge 10 includes a plurality of support piles 20 constituting a substructure and an upper work constructed between the heads of the support piles 20.
The superstructure includes a girder support member 31 that is horizontally mounted between the heads of the plurality of support piles 20, a plurality of main girders 40 that are supported by the girder support member 31 and arranged in the bridge shaft direction, and a main girder. 40 and a floor plate 41 such as a lining plate laid on the upper surface of 40.
In the present invention, the superstructure is constructed using a hand-drawn temporary girder 30 whose planar shape extending in the direction of the bridge axis at the front end of the existing superstructure has a U-shape and horizontal support means for supporting the hand-drawn temporary girder 30. To do.

<2> Hand-drawn temporary girder Referring to FIG. 2, the hand-drawn temporary girder 30 includes a girder receiving material 31 having a pile guide tube 33 (connection mechanism) and a girder receiving material 31 via the pile guide tube 33. And a pair of left and right side connecting members 32, 32 detachably provided.
Unlike the jetty panel used in the conventional construction method, the main girder 30 is not incorporated with the main girder 30, and the main girder 40 is used as a separate member from the manual girder 30.
Since not only the girder 31 but also the side tie 32 can be easily assembled using inexpensive general-purpose steel (such as H-shaped steel), the assembly cost of the hand-drawn temporary girder 30 can be kept low. be able to.
Similarly, when assembling the temporary provisional girder 30 using a known leasing material, the lease fee can be greatly reduced.

<2.1> Girder receiving material The girder receiving material 31 also serves as a structural material for the upper work, and is laid between the heads of the support piles 20 in the crossing direction of the bridge shaft.
The girder member 31 includes a plurality of pile guide tubes 33.
In this example, a mode in which two pile guide cylinders 33 are provided at both ends of the girder support member 31 is shown, but the girder support member 31 may include three or more pile guide tube 33.
Between the girder receiving member 31 and the pile guide tube 33, an integrated structure is formed by welding or bolting.

<2.2> Pile guide tube Pile guide tube 33 is a vertically oriented tube body that has both a standing guide function of support pile 20 and a function of connecting between beam receiving member 31 and side connecting member 32. is there.
The pile guide cylinder 33 illustrated in FIG. 2 will be described. The pile guide cylinder 33 includes a cylindrical portion 33a through which the support pile 20 can be inserted, annular flanges 33b and 33c provided above and below the cylindrical portion 33a, and a cylindrical portion 33a. And a plurality of connecting ribs 33d projecting along the bridge axis direction on the outer peripheral surface.
By attaching the fixing lid 33e to the upper flange 33b and closing the upper opening of the cylinder portion 33a, it is possible to fix the space between the head of the support pile 20 that has been driven and the pile guide cylinder 33.

<2.3> Side tie material The side tie material 32 is not a constituent material of the superstructure, but is a spacing member for positioning the girder 31 away from the forefront of the existing superstructure. It is installed between the heads in the direction of the bridge axis.
Connection ribs 32a project from the both end faces of the side connecting members 32 along the bridge axis direction, and are connected to the connection ribs 33d of the pile guide cylinder 33 via a plurality of connection bolts or pins not shown. And separable.

<2.3.1> Reason why the side tie material is made detachable The side tie material 32 is configured to be detachable from the girder support material 31 by using the same side tie material 32. This is for the purpose of easily changing the horizontal overhang length of the provisional temporary girder 30.

<2.3.2> Examples of side tie materials In addition to using low-priced existing structural steel and girder, the side tie material 32 uses a truss structure that combines multiple steel materials. You can also.
Since a large loading load is not applied to the side connecting material 32 that does not constitute the superstructure, the strength of the side connecting material 32 may be much smaller than that of the girder material 31 and the main girder 40 and can support its own weight. Only the strength is sufficient.

<2.4> Number of hand-drawn temporary girders In the conventional method, it was necessary to connect a number of jetty panels over the entire length of the simple bridge.
On the other hand, in the present invention, it is not necessary to connect the hand-drawn temporary girders 30 over the entire length of the simple bridge, and the construction can be performed only by using at least two sets of the hand-drawn temporary girders 30.

<3> Horizontal Support Means The horizontal support means of the hand-drawn temporary girder 30 includes a reaction force column 43 erected on the existing superstructure, and a first slant stretched between the top of the reaction force column 43 and the existing superstructure. A material 44 and a second cable-stretching material 45 stretched between the top of the reaction force column 43 and the hand-drawn temporary girder 30 are provided.
The first or second cable-stretching member 44, 45 can be applied with any one of steel materials, chains, rope materials excellent in tensile strength, or a combination thereof, via a length adjusting device such as a chain block. There is also a case.
In this example, the reaction force column 43 is erected directly above the existing support pile 20, but it may be erected on an existing superstructure near the existing support pile 20.

  The horizontal support mechanism is not limited to the mechanism illustrated in this example, and a known support mechanism that can obtain a reaction force from the existing superstructure and can horizontally support the hand-drawn temporary girder 30 protruding from the front end of the existing superstructure. Applicable.

[How to install a simple temporary bridge]
Next, the construction method of the simple temporary bridge 10 will be described.

<1> Standing up of reaction force column FIG. 3 shows a simple temporary bridge 10 in the middle of construction, and a plurality of main girders 40 and a floor plate 41 constituting the superstructure of the simple temporary bridge 10 include a plurality of support piles 20a, It is supported by 20b and the first hand-drawn temporary girder 30A horizontally mounted by these support piles 20a and 20b.
A heavy machine 50 such as a mobile crane is mounted on the upper surface of the floor plate 41.

  In order to extend the simple temporary bridge 10, a reaction strut 43 is erected directly above the foremost support pile 20 b and a first cable-stretching member 44 is stretched between the top of the reaction strut 43 and the existing superstructure. Set up.

<2> Assembling the hand-drawn temporary girder The U-shaped second hand-drawn temporary girder 30B is assembled on the ground or the upper surface of the existing superstructure.
As the first and second hand-drawn temporary girders 30A and 30B, the hand-drawn temporary girders 30 having the same structure shown in FIG. 2 are used.

<3> Horizontal construction of the hand-drawn temporary girder Referring to FIG. 3, the heavy-duty machine 50 is used to suspend the second hand-drawn temporary girder 30B at the extension position of the existing first hand-drawn temporary girder 30A and connect it. It connects via the pile guide cylinder 33 which is a mechanism.
That is, the connecting ribs 32a at the free ends of the side connecting members 32 and 32 constituting the second hand-drawn temporary girder 30B and the connecting ribs 33d of the pile guide tube 33 are overlapped, and a bolt or a pin is inserted into the overlapping portion. Connect.

By simply connecting the left end of the second hand-drawn temporary girder 30B to the right end of the existing first hand-drawn temporary girder 30A, the horizontality of the second hand-drawn temporary girder 30B cannot be maintained.
Therefore, as shown in FIG. 4, a second cable-stretching material 45 is stretched between the top of the reaction force strut 43 and the second hand-drawn temporary girder 30 </ b> B so that the reaction force strut 43 and the first and second cable-stretching materials 44 and 45 cooperate to support the second hand-drawn temporary girder 30B horizontally.

<4> Standing up the support pile When it demonstrates with reference to FIG. 4, the support pile 20c scheduled to be set up suspended from the heavy machine 50 is lifted and inserted into the foremost pile guide cylinder 33 of the second hand-drawn temporary girder 30B. While building vertically.
When the ground is hard, a known drilling machine is inserted into the support pile 20c, and the support pile 20c is driven to a predetermined depth while drilling.
And the head of each support pile 20c is fixed to the pile guide pipe | tube 33 of the 2nd extension temporary girder 30B, and the self weight of the 2nd extension temporary girder 30B is made to support the some support pile 20b, 20c.
When the head of the support pile 20c protrudes above the pile guide tube 33, the protruding portion of the support pile 20c is gas cut and then fixed to the second hand-drawn temporary girder 30B.

<5> Laying of main girder and floor board Referring to FIGS. 5 and 6, a pair of girder support members 31 arranged side by side along the bridge axis crossing direction of the first and second hand-drawn temporary girders 30A, 30B, The main girder 40 is placed between 31 and a floor plate 41 is laid on the plurality of main girders 40. The weight of the main girder 40 and the floor board 41 is supported by the plurality of support piles 20b and 20c via the pair of girder support members 31 and 31. The pair of side connecting members 32 and 32 are located outside the main girder 40 and the floor board 41. Therefore, the weight of the main beam 40 and the floor board 41 does not act on the side connecting material 32.

Since the main girder 40 can be placed on the upper surface of the pair of girder members 31 and 31 and hung over, a connecting rib is projected on the side end surface of the main girder 40 as in the conventional method, or a high strength bolt is used. There is no need to reinforce the connecting part.
Furthermore, because the main girder 40 can use existing structural steel, steel beams, truss structures, etc., it is extremely economical compared to the case of using many jetty panels that are integrated with the main girder used in the conventional method. It is.

<6> Removal and transfer of horizontal support means The reaction force support 43 and the first and second cable stay members 44 and 45 constituting the horizontal support means are removed.
The removed reaction force column 43 is moved directly above the foremost support pile 20c, and the first cable-stretching material 44 is also transferred in the same manner.
The horizontal support means may be moved immediately before the main girder 40 and the floor plate 41 are laid.

<7> Removal of side connecting material The both ends of the pair of side connecting materials 32 constituting the first hand-drawn temporary girder 30A are separated from the pile guide tube 33 and removed. The girder receiving material 31 constituting the first hand-drawn temporary girder 30A is left as it is as an upper work.
The removed side connecting material 32 is used as a material for assembling the hand-drawn temporary girder 30 of the next span.
The removal work of the side connecting material 32 may be performed immediately before the laying work of the main beam 40 and the floor board 41.

<8> Repeating the operation As described above, assembling the hand-drawn temporary girder 30, horizontally laying the hand-drawn temporary girder 30, standing the support pile 20, laying the main girder 40 and the floor board 41, and moving the horizontal support means A series of operations for removing the side connecting material 32 is repeated for each span.

In addition, the superstructure of the simple bridge | bridging 10 can also be constructed by giving a gradient in the up-down direction or meandering in the left-right direction, in addition to laying horizontally.
For example, it is possible to give a vertical gradient to the superstructure only by changing the angle of the connecting portion between the pile guide cylinder 33 and the side connecting material 32 constituting the hand-drawn temporary girder 30.
In addition, it is possible to swing the superstructure in the left-right direction by changing the length of one of the two side connecting members 32, 32 or the like.

<9> Correspondence of change in length in bridge axis direction The hand-drawn temporary girder 30 used for the construction of the simple bridge 10 is the length of the two side connecting members 32 and 32 connected to both ends of the girder support 31. It can be easily replaced by selecting.
In other words, it is possible to freely adjust the length of the hand-drawn temporary girder 30 in the bridge axis direction by simply replacing the two side connecting members 32 and 32.
Therefore, compared with the unitized exclusive jetty panel used in the conventional construction method, the adaptability to changes in the length in the bridge axis direction is remarkably superior.

DESCRIPTION OF SYMBOLS 10 ... Simple temporary bridge 20 ... Support piles 20a-20c ... Support pile 30 ... Manual provisional temporary girder 30A ... First manual temporary provisional girder 30B ... Second manual provisional temporary girder 31 ... Girder support member 32... Side linking member 32 a .. Connecting rib 33... Pile guide tube 33 a .. Tube portion 33 b .. Upper flange 33 c .. Lower flange 33 d. Board rail 40 ... main girder 41 ... floor board 43 ... reaction force column 44 ... first cable stay 45 ... second cable stay 50 ... heavy machinery

The present invention extends a superstructure ahead of an existing superstructure that is supported by a plurality of support piles, and supports piles on a pile guide tube attached to the superstructure while supporting the superstructure that has been extended by horizontal support means. A construction method of a simple temporary bridge that is erected by interpolating a girder with a plurality of pile guide tubes and a girder arranged in a direction orthogonal to the girder support members, A first step of assembling a hand-drawn temporary girder having a planar U-shape having a pair of side connecting members removably connected to both ends of the receiving material, and connecting the hand-drawn temporary girder in front of the existing superstructure The second step of supporting the hand-drawn temporary girder extended through the horizontal support means, and the third step of standing the support pile by interpolating the pile guide tube of the hand-drawn temporary girder. If a fourth to extended between the head of the support piles toward the Tenobe provisional digit digit receiving material that extends through the pile guide tube to the bridge axis transversely Degree and a fifth step for assembling the superstructure equipped with a main girder between the the existing Tenobe temporary digits extending the Tenobe provisionally digit digit receiving material, Tenobe of the existing temporary digit of the digit receiving material and a sixth step of removing the pair of side ties separated from, and performs engineering as 1-6 described above is repeated in the span units.
In another embodiment of the present invention, the pair of lateral connecting members removed are used to assemble a hand span temporary girder for the next span.
In another aspect of the present invention, the pile guide tube has a tube portion through which the support pile can be inserted, and a plurality of connecting ribs projecting along the bridge axis direction on the outer peripheral surface of the tube portion, A pair of side ties can be attached and detached via the connecting ribs.
In another aspect of the present invention, the horizontal support means of the hand-drawn temporary girder includes a reaction force column that is erected on the existing upper work, and a hand-drawn temporary beam that is extended with the existing upper work around the top of the reaction force support. The horizontal support means is used by being transferred in units of spans.

Claims (5)

Extend the superstructure ahead of the existing superstructure supported by multiple support piles, and insert the support pile into the pile guide tube attached to the superstructure while supporting the extended superstructure with the horizontal support means. It is a method of erection of a simple temporary bridge
A girder support member having a plurality of pile guide tubes, and a pair of side connecting members that are arranged in the orthogonal direction of the girder support members and are detachably connected to both ends of the girder support members via the pile guide tubes. Using multiple sets of hand-drawn temporary girders with a flat U-shape,
Connecting the base ends of the pair of side connecting members arranged in the direction of the bridge axis to the existing superstructure, and extending the hand-drawn temporary girder in the direction of the bridge axis;
After the support pile is erected by interpolating in the pile guide tube, the pair of side connecting materials are removed while leaving the girder support material erected in the crossing direction of the bridge axis between the heads of the plurality of support piles. Process,
A step of assembling an upper work by mounting a plurality of main girders between an existing hand-drawn temporary girder and a girder receiving material of the extended hand-drawn temporary girder,
It is characterized by repeatedly performing the plurality of steps described above in units of spans.
Simple temporary bridge construction method. Extend the superstructure ahead of the existing superstructure supported by multiple support piles, and insert the support pile into the pile guide tube attached to the superstructure while supporting the extended superstructure with the horizontal support means. It is a method of erection of a simple temporary bridge
A girder support member having a plurality of pile guide tubes, and a pair of side connecting members that are arranged in the orthogonal direction of the girder support members and are detachably connected to both ends of the girder support members via the pile guide tubes. Assembling a hand-drawn temporary girder having a flat U-shaped shape,
After connecting and extending the hand-drawn temporary girder in front of the existing superstructure, supporting the hand-drawn temporary girder extended through the horizontal support means; and
Inserting the support pile by interpolating the pile guide cylinder of the hand-drawn temporary girder; and
A step of laying the girder support material of the hand-drawn temporary girder extended through the pile guide tube between the heads of the support piles in the bridge axis crossing direction;
A step of assembling an upper work by mounting a main girder between the existing hand-drawn temporary girder and the girder receiving material of the extended hand-drawn temporary girder;
Removing a pair of side tie members separated from the girder support material of the extended manual temporary girder,
It is characterized by repeatedly performing the plurality of steps described above in units of spans.
Simple temporary bridge construction method.   3. The method for constructing a simple temporary bridge according to claim 1 or 2, wherein the pair of lateral connecting members removed are used to assemble a hand span temporary girder for the next span.   The pile guide tube has a tube portion through which the support pile can be inserted, and a plurality of connecting ribs projecting along the bridge axis direction on the outer peripheral surface of the tube portion, and a pair of sides via the connecting rib 3. The method for constructing a simple temporary bridge according to claim 1, wherein the connecting material is detachable.   A plurality of horizontal support means for the hand-drawn temporary girder are stretched between a reaction force column erected on the existing superstructure and a hand-drawn temporary girder extended around the top of the reaction force strut. The method for erection of a simple temporary bridge according to claim 1 or 2, wherein the horizontal support means is used by being transferred in units of spans.

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