JP2018021364A - Construction method of simple temporary bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a simple temporary bridge that significantly reduces a construction cost by using a general-purpose material, and eliminates an upward protrusion from an existing superstructure and thereby ensuring safety in crane work.SOLUTION: A construction method of a simple temporary bridge includes: a first step of using a projecting square girder 50 having a U-shaped planar form and a receiving girder material 30 provided with a plurality of pile guide cylinders, for having the projecting square girder 50 supported by the projecting square girder 30 of an existing superstructure and moved by sliding; a second step of fixing a base end side of the projecting square girder 50 on the existing superstructure; a third step of installing the other receiving girder material 30 afterwards on an undersurface in front of the projecting square girder 50 moved by sliding; a fourth step of erecting a support pile 20 using the pile guide cylinder 32 of the receiving girder material 30 installed afterwards; and a fifth step of installing a main girder 40 and laying a floor plate 41 between the receiving girder material 30 located at a front end of the existing superstructure and the receiving girder material 30 located in front of the existing superstructure. The first to the fifth steps are performed repeatedly for each span.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.
9 and 10, conventionally, the following steps 1 to 4 are repeated for each span.
(1) Flat ground assembly process for jetty panels.
As shown in FIG. 9, a rigid structure in which a plurality of main girders 81 and receiving girders 82 and the like arranged in the vertical and horizontal directions are connected and assembled in a lattice shape, and a plurality of pile guide cylinders 83 are attached to a part of the receiving girders 82. The pier panel 80 is grounded on a flat ground.
(2) Jetty panel erection process.
As shown in FIG. 10, one end of a jetty panel 80 suspended by a crane is connected to and extended from the front part of an existing jetty panel 80a.
At this time, the reaction strut 85 is erected on the existing superstructure, and 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, respectively. The cable stays 84 and 86 are connected to support the pier panel 80 horizontally.
(3) Support pile driving process.
A support pile 87 is driven by interpolating into each pile guide cylinder 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 cylinder 83 are connected. A floor board 89 is laid on the upper surface of the jetty panel 80.
(4) A step of attaching the reinforcing material.
A reinforcing member 88 such as a horizontal connecting member or a vertical brace member is suspended by a crane, the reinforcing member 88 is bridged between the adjacent supporting piles 87, and the side ends of the reinforcing member 88 are welded and fixed to the supporting 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.
<5> The reaction force struts projecting upward from the upper work are required not only to increase the work time in order to repeat the installation work and dismantling work of the reaction force struts 85 and the cable stay members 84 and 86 every span. 85 and the cable-stayed members 84 and 86 not only cause an obstacle to crane work, but also deteriorate the workability, and there is room for improvement in terms of ensuring safety.

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> Significant reduction in construction cost and improvement in workability.
<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.
<4> The crane work can be performed safely by eliminating the upward projection of the superstructure.

The present invention is a simple temporary bridge in which an upper work is extended in front of an existing superstructure supported by a plurality of support piles, and a support pile is inserted into a pile guide tube attached to the extended superstructure. An overhanging ruler girder having a U-shaped planar shape having a pair of side slide girders and an interval holding girder that is horizontally laid across one end of the side slide girders in the crossing direction of the bridge axis And a support ruler that is provided with a plurality of pile guide cylinders and is mounted and fixed on both sides of the existing superstructure using a support girder that is installed in the crossing direction of the bridge axis of the plurality of support piles A first step of releasing the fixing of the girder and slidingly moving the overhanging ruler girder in the extending direction of the existing superstructure; a second step of fixing the base end side of the overhanging ruler girder to the existing superstructure; A separate girder material is installed on the lower surface of the front part of the overhang ruler girder that extends in the direction of extension of the existing superstructure, in the crossing direction of the bridge axis 3rd process to attach, 4th process to fix the head of the support pile standing up using the pile guide cylinder of the post-installed girder material to the girder material, and the girder located at the front end of the existing superstructure A fifth step of laying a main girder and a floor plate between the lumber and the girder material positioned in front of the existing superstructure, and the first to fifth steps described above while repeatedly using the overhang ruler girder It is characterized in that the process is repeated for each span.
In another embodiment of the present invention, the total length of the pair of side slide girders has a length that is at least twice as long as the arrangement span of the girder material.
In another embodiment of the present invention, the overhang ruler girder is slid in the extension direction of the existing superstructure while the pair of side slide girders are supported by a plurality of receiving girders constituting the existing superstructure. .
In another embodiment of the present invention, guide stoppers protrude from both ends of the receiving beam member, and the guide stopper regulates dropping of the overhanging ruler beam during sliding movement.
In another embodiment of the present invention, a detachable bolt between a plurality of girder members of the existing superstructure and a pair of side slide girders of an extended ruler girder placed on the plurality of girder materials It is fixed by a stop.

The present invention has at least one of the following effects.
<1> Since a simple temporary bridge can be constructed by sliding and repeatedly using the overhang ruler girder, the use of a large number of jetty panels used in the conventional construction method can be omitted, and the construction cost can be greatly reduced.
<2> Since a general steel material can be used for the overhang ruler girder, the overhang ruler girder can be manufactured at low cost.
<3> Since the slide movement distance of the overhang ruler girder can be changed arbitrarily, it is more economical and responsive to changes in the length of the bridge axis compared to the unitized dedicated pier panel used in the conventional construction method. It will be much better.
<4> Since the main girder can be placed and hung on the upper surface of a pair of girder support members, connecting ribs are projected on the side end surfaces of the main girder as in the conventional method, or connected with high-strength bolts. For example, it is not necessary to reinforce the connecting portion.
Furthermore, the girder is a simple structure with a pile guide tube attached to the girder.
Therefore, the structure of the girder receiving material and the main girder constituting the superstructure of the simple temporary bridge can be simplified.
<5> Since the side slide girder overhanging the front of the existing superstructure can be supported by the existing superstructure with almost no load difference between the left and right like "Yajirobei", the load of the existing superstructure is reduced. It's small.
<6> Since there is no projecting object upward in the existing superstructure, there is no restriction when turning the crane, and the construction period can be shortened and the safety of the work can be improved.

Explanatory drawing of the construction method of the simple temporary bridge concerning the present invention Perspective view of overhang ruler girder used for construction Perspective view of girder material used for construction Plan view of a simplified temporary bridge with some parts omitted Sectional view of VV in FIG. Explanatory drawing of slide moving process of overhang ruler girder Explanatory drawing of the process of attaching a separate girder material to the front of the overhang ruler girder Explanatory drawing of the process of laying the main girder and floorboard between a pair of girder materials Perspective view of a pier panel used in a conventional method for constructing a temporary bridge 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 material 30 that is horizontally laid across the heads of the plurality of support piles 20, a plurality of main girders 40 that are supported by the girder material 30 and arranged in the bridge axis 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, an overhanging work is performed using a protruding ruler girder 50 that can slide and move on a plurality of receiving girder members 30 in the direction of the bridge axis, and a receiving girder member 30 separated from the protruding ruler girder 50. Install.
Although the overhang ruler girder 50 is used repeatedly, it is not a structural member of the superstructure.

<2> Overhang ruler girder Referring to FIGS. 1 and 2, the overhang ruler girder 50 has a U-shaped planar shape, and is used for overhanging and positioning the girder material 30 in front of the existing superstructure. This is a rigid structure.
The overhanging ruler girder 50 has a pair of left and right side slide girders 51 and 51 parallel to each other, and a distance holding girder 52 horizontally mounted in the crossing direction of the bridge axis between one end portions of the side slide girders 51 and 51.
Since a large load is not applied to the side slide girder 51 and the interval holding girder 52, an inexpensive general-purpose steel material (such as H-shaped steel) that can support its own weight can be used.
Note that the main girder 40 is not integrated into the overhang ruler girder 50.

<2.1> Side Slide Girder The pair of side slide girders 51, 51 is a long steel material that can be placed across a plurality of receiving girder members 30 arranged in the bridge axis direction.
In this example, the case where the overall length of the side slide girder 51 is twice the arrangement span of the girder material 30 will be described, but the total length may be twice or more the arrangement span of the girder material 30. .

<2.2> Interval Holding Girder The interval holding girder 52 is a member for holding the facing interval between the pair of side slide girders 51, 51 at an interval that can be placed on both sides of the beam receiving member 30.
A bracket 53 for suspension is attached to a part of the interval holding beam 52, and the hanging ruler beam 50 can be suspended by a crane.

<3> Girder material Referring to FIG. 3, the girder material 30 is a structural member of an upper work that is laid between the heads of the support piles 20 in the crossing direction of the bridge axis. A plurality of pile guide cylinders 32 are provided in the receiving girder 31 in accordance with the arrangement interval of the support piles 20.
The receiving girder 31 and the pile guide cylinder 32 have an integral structure by welding or bolting.
A part of the receiving girder 31 protrudes outside the pile guide tube 32 so that a pair of side slide girders 51 and 51 can be placed thereon.

<3.1> Girder Girder 31 is a girder that is installed horizontally across a plurality of support piles 20 in the crossing direction of the bridge axis, and includes a plurality of main girders 40 and a pair of side slide girders 51, 51. It has a total length that can be supported.
A guide stopper 33 projects from the upper end of the receiving girder 31 in order to regulate the falling of the side slide girder 51 when the overhang ruler girder 50 slides (see FIG. 3).

<3.2> Pile guide cylinder The pile guide cylinder 32 is a vertically oriented cylinder having a standing guide function of the support pile 20.
If it demonstrates with reference to FIG. 3, the pile guide cylinder 32 will close the cylinder part 32a which can insert the support pile 20, the annular flanges 32b and 32b provided in the upper and lower sides of the cylinder part 32a, and the upper opening of the cylinder part 32a. And a fixed lid 32c.
In this example, the receiving girder 31 is provided with two pile guide tubes 32, but three or more pile guide tubes 32 may be provided.
By attaching the fixing lid 32c to the upper flange 32b, it is possible to fix between the head of the support pile 20 and the pile guide tube 32 that have been driven.

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

<1> Present Situation FIG. 4 shows a simple temporary bridge 10 in the middle of construction. A plurality of main girders 40 and a floor plate 41 constituting an existing superstructure of the simple temporary bridge 10 are a plurality of support piles 20 and their respective supports. It is supported by a girder material 30 laid horizontally on the pile 20. Only heavy machinery such as a mobile crane is mounted on the upper surface of the floor plate 41, and there are no protrusions upward from the floor plate 41 of the existing superstructure.
The overhanging ruler girder 50 having a U-shape is placed across both ends of the three sets of girder materials 30a to 30c, and the interval retaining girder 52 approaches the foremost girder material 30c constituting the upper work. Located in position.
A space between each side slide beam 51 and the receiving beam members 30a to 30c is fixed by a known connecting means. As the connecting means, clip fastening or the like can be applied in addition to bolt fastening.

<2> Slide Movement of Overhang Ruler Girder The slide movement operation of the overhang ruler girder 50 will be described with reference to FIGS.

<2.1> Separation of the overhanging ruler girder and the receiving girder material Before sliding the overhanging ruler girder 50, remove the bolts etc. securing the side slide girder 51 and the receiving girder materials 30a to 30c. Separate both members.

<2.2> Sliding movement of the overhang ruler girder The suspension rope 60 is connected to the interval holding girder 52, and the suspension rope 60 is hung with a crane (not shown) while the overhang ruler girder 50 is kept in a horizontal state.
By operating the crane, the overhang ruler girder 50 is pulled forward in the extending direction of the existing superstructure, and the overhang ruler girder 50 is slid by one span.
When the extended ruler girder 50 is pulled, the pair of side slide girders 51 and 51 slide while being supported on the upper surfaces of the two sets of receiving girder members 30b and 30c constituting the existing superstructure.
During the sliding movement of the overhang ruler girder 50, the guide stopper 33 restricts the side slide girder 51 from dropping.

<3> Fixing the overhang ruler girder After the slide ruler girder 50 has been slid, the abutting portions of the side slide girders 51 and the two sets of girder members 30b, 30c are fixed with bolts, etc. Remove the hanging rope 60.
Since the base end side of the overhang ruler girder 50 is fixed and supported by the existing superstructure, the extended first half of the overhang ruler girder 50 is stable because the straightness is maintained by the rigidity of the side slide girder 51. Supported in a cantilevered position.
The extended front half of the overhang ruler girder 50 is not greatly bent due to the rigidity of the side slide girder 51.
Since the entire length of the side slide girder 51 has a length corresponding to two spans, even if one span of the side slide girder 51 protrudes forward of the existing superstructure, the remaining one span of the side slide girder 51 is provided. Is supported by two sets of receiving beams 30b and 30c of the existing superstructure.
That is, since the side slide girder 51 projecting forward of the existing superstructure can be supported by the existing superstructure with almost no load difference between the left and right like “Yajirobei”, the load burden of the existing superstructure is reduced. Therefore, the existing superstructure can hold a stable cantilever posture of the overhang ruler girder 50 only by bearing the weight of the interval retaining girder 52.

<4> Installation of beam support material Referring to FIG. 7, an operation of installing a separate beam support material 30d on the front portion of the overhang ruler beam 50 will be described.

<4.1> Suspension of girder material A separate girder material 30d is suspended through a suspension rope 60 suspended from a crane.
A separate girder material 30 d is suspended below the foremost part of the overhanging ruler girder 50 and arranged in parallel with the interval holding girder 52.
Since the overall length of the girder material 30d is larger than the distance between the pair of side slide girders 51, 51, the girder material 30d is overhanged by making it oblique along the diagonal direction of the overhanging ruler girder 50. The ruler girder 50 can be easily passed.

<4.2> Fixing the girder material The girder material 30d is slowly lifted so that the upper surface of the girder material 30d is brought into contact with the lower surfaces of the pair of side slide girders 51, 51, and the abutting portion is secured with a bolt or the like. It fixes and integrates the receiving girder material 30d with the overhanging ruler girder 50.
When the girder 30d is fixed, the hanging rope 60 is removed.
The existing superstructure only bears the weights of the interval holding girder 52 and the receiving girder 30d, and can maintain the stable horizontal posture of the overhang ruler girder 50 and the girder 30d positioned in front of the existing superstructure.

<5> Standing support piles Referring to FIG. 1, the support pile 20 lifted by a crane is built vertically while being inserted into a pile guide tube 32 of a receiving girder material 30 d attached to an overhang ruler girder 50. Include.
When the ground is hard, a known drilling machine is inserted into the support pile 20 and driven to a predetermined depth while drilling.
Then, by fixing the head of the support pile 20 to each pile guide tube 32, the support pile 20 supports the weight of the receiving girder material 30 d.

<6> Laying Main Girder and Floor Board With reference to FIG. 8, the main girder 40 is placed between a pair of receiving girder members 30c and 30d, and the floor board 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 a plurality of support piles 20 via a pair of receiving girder members 30 and 31. The overhang ruler girder 50 is located outside the main girder 40 and the floor board 41. The weight of the main beam 40 and the floor board 41 does not act on the ruler beam 50.

Since the main girder 40 can be mounted on the upper surfaces of the pair of girder members 30c, 30d, a connecting rib can be provided on the side end surface of the main girder 40 as in the conventional method, or a high strength bolt can be used. There is no need to reinforce the connecting part.
Furthermore, since a commercially available general-purpose steel material (H-shaped steel or the like) can be used without being processed for the main girder 40, it is extremely economical as compared with a pier panel in which the main girder used in the conventional construction method is integrated.

<7> Repeating the process As described above, the first step of projecting the overhanging ruler girder 50 by sliding the existing superstructure and sliding the overhanging ruler girder 50 in the extending direction of the existing superstructure. The second step of fixing the base end side to the existing superstructure, the third step of retrofitting a separate girder material 30 to the overhanging ruler girder 50 projecting forward, and standing up using the retrofitted girder material 30 A fourth step of fixing the head of the support pile to the girder material, and a series of steps of a fifth step of laying the main girder 40 and the floor plate 41 between the pair of girder materials 30 and 30 positioned at the front part. Repeat for each span.

In this example, the fixing work and the separating work of the side slide girder 51 constituting the overhang ruler girder 50 can be performed safely because only the bolt attaching / detaching work using the existing superstructure is required.
Although it is conceivable that the entire overhang ruler girder 50 is lifted and moved, not only a large lifting force is required to lift the whole overhang ruler girder 50, but also the long overhang ruler girder 50 is shaken by the influence of a cold or the like. It is easy and construction efficiency is low.
When the overhang ruler girder 50 is slid while being supported by the existing superstructure as in the present invention, not only can the overhang ruler girder 50 be lifted and moved, but it can move with a small force, such as wind. Construction can be performed safely and efficiently without being affected.
In the present invention, the overhanging ruler girder 50 can be extended to the front of the existing superstructure by obtaining a reaction force from the existing superstructure, so that the reaction force struts and slanting materials used in the conventional method projecting upward from the superstructure Is no longer necessary.
Since there is no projecting object upward from the existing superstructure, there are no restrictions when turning the crane when repeating the above series of steps, shortening the work period and improving work safety.

<8> Correspondence to change of length in bridge axis direction The overhang ruler girder 50 used for the construction of the simple bridge 10 should have the total length of the pair of side slide girders 51, 51 longer than the reference span length. The extension amount of the overhang ruler girder 50 can be arbitrarily changed according to the site.
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 pile 30 ... Girder material 30a-30d ... Girder material 31 ... Girder 32 ... Pile guide tube 32a ... Tube part 32b ... Flange 32c .. Fixed lid 33 ... Guide stopper 40 ... Main girder 41 ... Floor plate 50 ... Overhang ruler girder 51 ... Side slide girder 52 ... Space holding girder 60 ... Hanging rope

Claims (5)

This is a simple temporary bridge construction method in which a superstructure is extended in front of an existing superstructure that is supported by multiple support piles, and the pile is placed upright in a pile guide tube attached to the extended superstructure. There,
An overhanging ruler girder having a U-shaped planar shape having a pair of side slide girders and an interval holding girder horizontally spanned across the bridge axis between one end portions of the side slide girders,
Using a girder material comprising a plurality of pile guide cylinders and erected in the crossing direction of the bridge axis of a plurality of support piles,
A first step of releasing the fixation of the overhanging ruler girder placed and fixed on both sides of the existing superstructure and sliding the overhanging ruler girder in the extending direction of the existing superstructure;
A second step of fixing the base end side of the overhang ruler girder to the existing superstructure;
A third step of retrofitting a separate girder material in the transverse direction of the bridge axis on the lower surface of the front portion of the overhanging ruler girder that projects in the extension direction of the existing superstructure;
A fourth step of fixing the head of the support pile erected using the pile guide cylinder of the support member attached later, to the support member;
Including a fifth step of laying a main girder and a floor plate between a girder material located at the front end of the existing superstructure and a girder material located in front of the existing superstructure,
While repeatedly using the overhang ruler girder, the first to fifth steps described above are repeatedly performed in units of spans,
Simple temporary bridge construction method.   The construction method for a simple temporary bridge according to claim 1, wherein the total length of the pair of side slide girders is at least twice as long as the span of the receiving girder.   The pair of side slide girders are slid and moved in the extending direction of the existing superstructure while the pair of side slide girders are supported by a plurality of receiving girders constituting the existing superstructure. The construction method of the simple temporary bridge as described in 1 or 2.   The guide stopper protrudes from both ends of the receiving girder material, and the guide stopper regulates dropping of the protruding ruler girder during sliding movement. The construction method of the simple temporary bridge described in 1.   A plurality of girder members of the existing superstructure and a pair of side slide girders of an extended ruler girder placed on the plurality of girder members are fixed by detachable bolts. The construction method of the simple temporary bridge as described in any one of Claims 1 thru | or 3.

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