JP7013352B2 - 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 and a temporary gantry, and particularly to a method of constructing a temporary bridge in which a support pillar is joined to an upper part of a support pile that has been driven into the ground in advance to construct a substructure.

Steel materials such as steel pipes are used as support piles and support pillars for temporary piers, etc., and the support pillars are joined and extended to the upper part of the support piles that were previously driven into the ground.
Welding all around the site is known as a means for joining the support pile and the support column, but a tubular joint socket as disclosed in Patent Documents 1 to 4 is used because the work becomes large. Various mechanical joining methods used have been proposed.

Patent Document 1 discloses a joining method in which a joint socket having an inner diameter substantially the same as the outer diameter of the upper and lower steel pipes is used, and the joint socket is exteriorized across the butt portion of the upper and lower steel pipes.
In Patent Document 2, a joint socket having an inner diameter larger than the outer diameter of the upper and lower steel pipes is used, and a plurality of through bolts are inserted between the outer joint socket and the upper and lower steel pipes straddling the butt portion of the upper and lower steel pipes. A joining method is disclosed in which an adhesive is filled in a gap formed between a joint socket and the peripheral surfaces of upper and lower steel pipes and then fixed after being screwed through.
Patent Document 3 describes a split type joint socket having an inner diameter larger than the outer diameter of the upper and lower steel pipes, a plurality of sets of band materials for tightening the joint sockets, and a gap between the joint socket and the peripheral surfaces of the upper and lower steel pipes. Using a pair of spacers made of hard rubber to be interspersed and exhibiting an annular shape, a semi-cylindrical socket divided into upper and lower steel pipes is exteriorized with a spacer in between, and then the band material is tightened to form the upper and lower steel pipes. A joining method in which a joint portion is flexibly joined is disclosed.
Patent Document 4 discloses a joining method in which the ends of upper and lower steel pipes are directly in-row fitted to each other without using a joint socket, and a plurality of through bolts are screwed to the polymerized fitting portion to integrate them. Has been done.

Japanese Unexamined Patent Publication No. 10-273912 Japanese Unexamined Patent Publication No. 11-222853 Japanese Unexamined Patent Publication No. 2001-64961 Japanese Unexamined Patent Publication No. 2005-351421

The conventional erection bridge construction technology has the following problems.
<1> Since it is extremely difficult to drive the support piles to the regular height while maintaining verticality in riverbeds, etc., the upper part of the support piles may be displaced from the regular position or tilted.
If the support pile after driving is displaced or tilted in the horizontal direction, the conventional joint socket cannot absorb these construction errors.
<2> In the joining methods of Patent Documents 2 and 4, a large number of bolts must be attached while performing troublesome bolt hole positioning, and the joining work requires a lot of time and labor, and workability is required. It is bad and the construction cost is high.
<3> The joining technique of Patent Document 3 using a split type joint socket, a band material, and a spacer made of hard rubber has a joining structure that allows displacement of the joint, and the joint cannot be joined in a non-displaceable manner. ..
<4> In the joining method disclosed in Patent Documents 1 to 4, after the support columns are individually joined to each support pile, gussets are welded on-site to the support columns and the like, and a breath material is retrofitted.
Therefore, there is a problem that the entire construction period becomes long and the construction cost increases.
<5> Workability will be improved if a breath material can be attached between multiple support columns in a factory with a well-equipped manufacturing environment to unitize the substructure, and the substructure unit brought in at the site can be mounted on the support pile at the site and assembled. can do.
In this method, even if the substructure unit is manufactured in advance at the factory according to the design dimensions, accurate assembly cannot be performed if there is a construction error in the support pile at the site.
It is conceivable to individually manufacture the substructure unit at the factory according to the on-site dimensions of the support pile, but this method not only increases the manufacturing cost of the substructure unit, but also waits for the substructure unit to be delivered to the site. Not only is it long and workability is poor, but the construction period is also prolonged.

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 pillar on the 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 assembling a substructure unit having a gate shape including a plurality of support pillars, and a process of grounding the substructure unit, when the substructure unit is grounded, a tubular joint socket is attached to the end of each support pillar. The existing process of assembling, the process of exteriorizing the joint socket of the lifted substructure unit to the existing support pile and extending the support column to the existing support pile, and the existing process to correct the construction error of the support pile. At least a step of obtaining a reaction force from the support pile to adjust the adjusting gap formed between the joint socket and the peripheral surface of the support pile is provided, and each of the above steps is repeated to construct a temporary bridge.
In the present invention, by assembling a joint socket to the end of each support column of the substructure unit to be grounded, it can be assembled in units of the substructure unit to be grounded, and the workability can be improved, and the support pile can be constructed. The substructure unit can be erected at the design position without being affected by the error.
In another embodiment of the present invention, the joint socket has a cylindrical different-diameter cylinder body that can be exteriorized straddling the butt portion of the support pillar and the support pile, and a support pile or a support pillar screwed to the different-diameter cylinder main body. It is equipped with a plurality of fixing adjustment bolts capable of pressing the outer peripheral surface of the. The different diameter cylinder main body has a lower cylinder that can be exteriorized as a support pile, an upper cylinder that can be exteriorized as a support pillar, and a shelf plate interposed at the boundary between the lower cylinder and the upper cylinder located on the coaxial line. .. An adjustment gap is formed between at least one of the lower cylinder and the upper cylinder formed of different diameters and the peripheral surface of the support pillar or the support pile, and a shelf is formed between the upper end of the support pile and the lower end of the support pillar. The joint socket is positioned by the interposition of the plate, and the plurality of fixing adjusting bolts are taken in and out to maintain the horizontal position and the erecting angle of the support column adjusted within the adjustment gap.
In another embodiment of the present invention, the inner diameter of the lower cylinder of the joint socket has a dimensional relationship larger than the inner diameter of the upper cylinder.
In another embodiment of the present invention, the upper cylinder of the joint socket may have a dimensional relationship that allows inscribed to the support column.
In another embodiment of the present invention, the substructure unit includes a plurality of support columns, a girder member erected between the heads of the plurality of support columns, and a breath member erected between the side surfaces of the plurality of support columns.
In another embodiment of the present invention, the joint socket and the outer peripheral surface of the support pile or the joint socket and the outer peripheral surface of the support column may be connected and reinforced via a plurality of tension members.
In another embodiment of the present invention, the support pile is any one of steel pipe, column material, or H-shaped steel, and the support column is any one of steel pipe, column material, or H-shaped steel, and the support. The pile or support column is a combination of similar steel materials or a combination of different types of steel materials.

The present invention has at least one of the following effects.
<1> By assembling a joint socket to the end of the support column of the substructure unit to be grounded, it can be constructed without being affected by the construction error of the support pile, and the substructure that is grounded is unitized and assembled. Since it can be attached, the construction period can be significantly shortened.
<2> Since the substructure is unitized at the site and grounded, the work at high places at the site is reduced and the safety of the work is improved.
<3> By simply operating the fixing adjustment bolt screwed to the joint socket in the forward and reverse directions, it is possible to absorb the construction error of the support pile and erect the upper support column in the normal position.
<4> Since bolts can be firmly joined to the support piles and support columns without penetrating them, workability at the site can be significantly improved and economical joining can be achieved as compared with the conventional case.
<5> By connecting the support pile abutted with the joint socket and the outer peripheral surface of the support column with a plurality of tension materials, not only the effect of preventing the support pile and the support column from coming off of the joint socket is enhanced, but also the tension material is enhanced. Functions as a strength member for tension and bending of the joint, so that the tensile strength and bending strength of the joint are significantly improved.
<6> The joint socket 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.

Perspective view of the substructure unit constructed near the construction site It is an explanatory diagram of the construction method of a temporary bridge, (A) is an explanatory diagram of a support pile driving process, (B) is an explanatory diagram of a substructure suspension process, and (C) is a support pile via a joint socket. Explanatory drawing of the process of extending the substructure unit to Explanatory drawing of the construction method of the temporary bridge to construct the superstructure on the upper part of the substructure unit Perspective view of a joint portion in which a part of the joint socket according to the first embodiment is broken. It is explanatory drawing of the joint part of the support pile and the support pillar, (A) is the vertical view of the joint part, (B) is the BB sectional view of (A), (C) is C- C sectional view, (D) is an explanatory view of other fixing adjustment bolts. An explanatory diagram of the method of joining the support pile and the support column, (A) is an explanatory diagram of the cutting process of the upper part of the support pile, (B) is an explanatory diagram of the process of exteriorizing the joint socket to the support pile, and (C) is a joining. Explanatory drawing of the process to correct the standing position of the finished support pillar Vertical cross-sectional view of the joint portion according to the second embodiment in which the support column is inscribed in the upper cylinder of the joint socket and joined. An explanatory diagram according to the third embodiment in which the steel material of the support column is changed, (A) is an explanatory diagram to which a column material is applied, and (B) is an explanatory diagram to which an H-shaped steel is applied. An explanatory diagram according to the third embodiment in which the steel material of the support pile is changed, (A) is an explanatory diagram to which a column material is applied, and (B) is an explanatory diagram to which an H-shaped steel is applied. Explanatory drawing of Example 4 in which tension material was additionally arranged

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

<1> Outline of construction method Explaining with reference to FIGS. 1 and 2, the present invention comprises a step of driving a support pile 10 into the ground in advance and a step of cutting the pile head of the support pile 10 to a design height. , A gate type including a plurality of support columns 20 and 20, a girder member 51 erected between the heads of the plurality of support columns 20, 20 and a breath member 52 erected between the side surfaces of the plurality of support columns 20, 20. A tubular joint socket 30 which is a mechanical joining means under each support pillar 20 when the substructure unit 50 is ground-assembled (land-assembled) near the site and the substructure unit 50 is ground-assembled. The process of assembling, the process of exteriorizing the joint socket 30 of the lifted substructure unit 50 to the existing support pile 10 and extending the support pillar 20 to the existing support pile 10, and the reaction force from the existing support pile 10. At least a step of adjusting the gap between the peripheral surfaces of the joint socket 30 and the support pile 10 is provided so that the construction error of the support pile 10 can be corrected.
The main materials used in the construction will be described in detail below.

<2> Support piles and support columns In this example, a form in which the support piles 10 and the support columns 20 are steel pipes of the same type and the same diameter will be described.

<3> Joint socket Explaining with reference to FIGS. It is provided with a plurality of fixing adjusting bolts 34, 36 screwed to the peripheral surface of 35.

<3.1> Different-diameter cylinder main body The different-diameter cylinder main body 35 has a lower cylinder 31 that can be exteriorized via a _first adjustment gap G1 at the upper part of the support pile 10, and a _second adjustment gap G2 at the lower part of the support pillar 20. It is composed of an upper cylinder 32 that can be exteriorized via the above, and a shelf plate 33 that is integrated by interposing the boundary portion of both cylinders 31 and 32 located on the coaxial line.
In this example, the lower cylinder 31 and the upper cylinder 32 are each made of steel pipes having different diameters.
The shelf plate 33 is a steel plate material interposed between the butt ends of the support pile 10 and the support pillar 20, and both cylinders 31 and 32 having different diameters are integrated with both cylinders 31 and 32 so that the load can be transmitted. ing.
The shape of the shelf board 33 is not limited to the illustrated annular shape, and may be a disk shape.
The shelf board 33 may extend horizontally toward the inside of both cylinders 31 and 32 so that it can be interposed between the butt ends of the support pile 10 and the support pillar 20.

<3.2> Dimensional relationship between steel material, lower cylinder and upper cylinder If only the lower cylinder 31 and upper cylinder 32 of the joint socket 30 are to be exteriorized on the support pile 10 and the support pillar 20, respectively, the inner diameter D ₁ of the lower cylinder 31 And the inner diameter D ₂ of the upper cylinder 32 may be the same diameter larger than the diameter d ₁ and the diameter d ₂ of the support pile 10 and the support pillar 20.
In this example, in order to absorb the construction error (horizontal error, tilt error) of the support pile 10 into the joint socket 30, the inner diameter D1 of the lower cylinder 31 and the inner diameter D2 of the _upper cylinder 32 _are not the same diameter. The diameter was combined so that an adjustment gap was formed between at least one of the lower cylinder 31 and the upper cylinder 32 and the peripheral surface of either the support pile 10 or the support pillar 20.

<3.3> Adjustment gap In this example, the _first adjustment gap G1 is formed between the peripheral surfaces of the lower cylinder 31 and the support pile 10, and the second adjustment is made between the peripheral surfaces of the upper cylinder 32 and the support pillar 20. The form in which the gap G ₂ is formed will be described.
Further, in this example, the inner diameter D ₁ of the lower cylinder 31 is larger than the inner diameter D ₂ of the upper cylinder 32 (D ₁ > D ₂ ) so that the first adjustment gap G ₁ is larger than the second adjustment gap G ₂ . I have a relationship.

<3.3.1> First adjustment gap The _first adjustment gap G1 is a gap for absorbing (correcting) the construction error (horizontal position and tilt) of the support pile 10.
The amount of displacement of the support pile 10 at the horizontal position is proportional to the _first adjustment gap G1.
The amount of displacement of the erection angle of the support pile 10 is proportional to the _first adjustment gap G1 and inversely proportional to the total length of the lower cylinder 31.
Therefore, the total lengths of the _first adjustment gap G1 and the lower cylinder 31 can be appropriately changed so as to absorb the assumed construction error of the support pile 10.

<3.3.2> Second adjustment gap The _second adjustment gap G2 is a gap for finely adjusting the horizontal position and tilt of the support pillar 20 after the support pile 10 and the support pillar 20 are joined.
The amount of displacement of the support column 20 in the horizontal position is proportional to the _second adjustment gap G2.
The amount of displacement of the angle of the support column 20 is proportional to the second adjustment gap G2 and _inversely proportional to the total length of the upper cylinder 32.

<3.4> Fixing adjustment bolts The plurality of fixing adjustment bolts 34 and 36 have a function to adjust the horizontal position and angle of the support pile 10 and the support pillar 20 in cooperation with the different diameter cylinder main body 35, and the support after adjustment. It has a function (positioning function) of holding the positions of the pile 10 and the support pillar 20.
Since the plurality of fixing adjustment bolts 34 and 36 do not penetrate the support pile 10 and the support pillar 20, no special processing such as opening bolt holes in the support pile 10 and the support pillar 20 is required.

<3.4.1> Number of fixing adjustment bolts and screwing position The number of fixing adjustment bolts 34, 36 screwed to the cylinders 31 and 32 at equal intervals in the circumferential direction may be 3 or more. , The number of bolts is appropriately selected in consideration of the bending strength required for the joint socket 30 and the like.
Further, the screwing positions of the fixing adjustment bolts 34 and 36 are not limited to the upper and lower portions of the cylinders 31 and 32, and may be additionally provided on the peripheral surface between the upper and lower portions thereof.
In this example, the fixing adjustment bolts 34 and 36 are screwed to the nuts 31a and 32a fixed to the outer peripheral surfaces of the cylinders 31 and 32 by welding or the like, but screw holes are directly formed in the cylinders 31 and 32. The adjusting fixing bolts 34 and 36 may be screwed together.

<3.4.2> Fixing adjustment bolt with backing plate As shown in FIG. 5 (D), bolts having a backing plate 37 larger than the bolt shaft attached to the tip of the bolt shaft as the fixing adjustment bolts 34 and 36. May be used. By using the fixing adjustment bolts 34 and 36 to which the plate 37 is attached, the fixing force between the support pile 10 and the support pillar 20 can be increased and the number of the fixing adjustment bolts 34 and 36 used can be reduced.

[Construction method of temporary bridge]
A specific construction method of the temporary bridge will be described with reference to FIGS. 1, 2, and 6.

<1> Driving process of support piles As shown in FIG. 2A, a plurality of support piles 10 are driven into the ground at intervals to a predetermined depth.
It is known that the support pile 10 is driven by using a vibro machine or a down-the-hole drill machine depending on the geology.
When driving the support pile 10, the height of the pile head is set to a position several tens of centimeters higher than the normal position.

<2> Pile head excision process It is extremely difficult to drive the support pile 10 while maintaining accurate verticality.
FIG. 6A shows a case where the support pile 10 is driven in at an angle θ with respect to the vertical line to be driven.
In order to correct the pile head, the upper part of the support pile 10 is cut horizontally along the design height 11 of the pile head shown by the broken line.

<3> Groundworking process of substructure Explaining with reference to FIG. 1, a girder 51 is erected between the heads of a plurality of support columns 20 and 20 laid on the ground surface, and the support columns 20 and 20 of the plurality of support columns 20 and 20 are erected. A breath material 52 (horizontal connecting material and cross breath) is erected between the side surfaces to assemble the substructure unit 50.

<4> Assembly process of joint socket The upper cylinder 32 is externally attached to one end of each support column 20, and the joint socket 30 is integrally assembled.
FIG. 6B shows a form in which the joint socket 30 is assembled to one end of the support pillar 20, and the upper cylinder 32 is inserted until the shelf plate 33 comes into contact with one end of the support pillar 20, and a plurality of fixing adjustment bolts 36 are inserted. Tighten and assemble the joint socket 30 inseparably.

<5> Substructure hoisting process FIG. 2 (B) shows a state in which a gantry unit 50 having a gate shape is lifted by a crane directly above an existing support pile 20, and FIG. 2 (C) shows a joint socket 30. The state where the lower cylinder 31 is exteriorized on the upper part of the support pile 10 is shown.
FIGS. 6B and 6C show the relationship between the joint socket 30 and the support pile 1 at this time.

The suspended support pillar 20 is moved directly above the existing support pile 10, and the support pillar 20 is lowered to exterior the lower cylinder 31 of the joint socket 30 on the upper portion of the support pile 10.
When the shelf plate 33 of the joint socket 30 comes into contact with the end surface of the support pile 10, the descent of the support pillar 20 is restricted, and the support pillar 20 is extended above the support pile 10.
By interposing the shelf plate 33 between the upper end of the support pile 10 and the lower end of the support pillar 20, the external joint socket 30 can be positioned so as to straddle between the support pile 10 and the support pillar 20.

<6> Step to correct construction error In the present invention, the support pillar 20 stands in the normal position by absorbing the construction error of the existing support pile 10 joined by performing a simple correction operation with the joint socket 30 described below. Can be set up.

<6.1> Adjustment of horizontal position When the upper position of the support pile 10 is displaced horizontally from the normal position, a plurality of fixing adjustment bolts 34 screwed to the lower cylinder 31 are operated in the forward and reverse directions to move the joint socket 30. Displace in the correction direction.
The joint socket 30 can be displaced in any direction by obtaining a reaction force from the existing support pile 10.
While performing a pressing operation in which the tips of the plurality of fixing adjusting bolts 34 are brought into contact with the outer peripheral surface of the support pile 10 and a retracting operation of the fixing adjusting bolts 34 on the other side, the joint is joined by the pressing reaction force of the fixing adjusting bolts 34. The entire socket 30 is horizontally moved in the correction direction.
The support column 20 inserted in the upper cylinder 32 follows the joint socket 30 and moves horizontally in the correction direction.

<6.2> Angle adjustment When the support pile 10 is tilted by an angle θ with respect to the regular vertical line, the upper and lower fixing adjustment bolts 34 screwed to the lower cylinder 31 are rotated in the forward and reverse directions. Operate to vertically correct the angle of the support column 20 together with the joint socket 30.
The horizontal position and angle of the joint socket 30 and the support column 20 can be corrected within the range of the _first adjustment gap G1 formed between the peripheral surfaces of the lower cylinder 31 and the support pile 10.
For convenience of explanation, the horizontal position and angle adjustment of the joint socket 30 with respect to the support pile 10 have been described separately, but in reality, these operations are performed in parallel.

<6.3> Fixing the support pile and the lower cylinder After correcting the horizontal position and angle of the joint socket 30 with respect to the support pile 10, tighten all the fixing adjustment bolts 34 to make a gap between the support pile 10 and the lower cylinder 31. It is rigidly connected so that it cannot be displaced.

<6.4> Fine adjustment of the support column When the adjustment amount of the support column 20 is insufficient within the range of the _first adjustment gap G1, a plurality of fixing adjustment bolts 36 screwed to the upper cylinder 32 of the joint socket 30 are used. The horizontal position and angle of the support column 20 are finely adjusted by rotating in the forward and reverse directions.
Since the joint socket 30 is immovably fixed to the upper part of the support pile 10 by the lower cylinder 31 and a plurality of fixing adjustment bolts 34, a pressing reaction force is obtained from the support pile 10 and the joint socket 30 to obtain a second adjustment gap G. The horizontal position and angle of the support column 20 can be finely adjusted within the range of ₂ .

<6.5> Fixing the support pillar and the upper cylinder After correcting the horizontal position and the standing angle of the support pillar 20, tighten all the fixing adjustment bolts 36 so that the support pillar 20 and the upper cylinder 32 cannot be displaced. Rigid to.
After completing all the joints between the support pile 10 and the support column 20 using the joint socket 30, the support column 20 is separated from the crane or the like.
After exteriorizing the joint socket 30 across the butted portion of the support pile 10 and the support pillar 20 in this way, the construction error of the support pile 10 can be reduced by a simple operation of rotating a plurality of fixing adjustment bolts 36. The support pillar 20 can be erected in a normal position by absorbing it.
Therefore, the workability at the site can be significantly improved as compared with the conventional joining structure, and the joining can be economically performed.

<7> Construction of superstructure Explaining with reference to FIG. 3, a plurality of substructure units 50 are constructed along the bridge axis direction of the temporary bridge.
A beam girder 61 is hung between the upper portions of a plurality of substructure units 50 and 50 located along the bridge axis direction, and a plurality of lining plates 62 are laid on the beam girder 61 to construct the superstructure 60.

By repeating each of the above steps, a temporary bridge with a predetermined total length is constructed.
When dismantling the temporary bridge, the joint between the support pile 10 and the support column 20 is released by a simple operation of loosening the fixing adjustment bolts 34 and 36 of the joint socket 30, and the substructure unit 50 is united. Can be disassembled. The removed joint socket 30 can be reused.

[Characteristics of joint between support pile and support column]
The characteristics of the joint portion between the support pile 10 and the support column 20 joined by using the joint socket 30 will be described with reference to FIG. 6 (C).

<1> Compression Axial Force A compression axial force due to the weight of the superstructure 50 always acts on the joint between the support pile 10 and the support column 20.
Since the upper and lower surfaces of the shelf plate 33 of the joint socket 30 are interposed between the upper end of the support pile 10 facing each other and the facing surface of the lower end of the support pillar 20, the compression axial force is the shelf plate. Through 33, the support pile 10 and the support pillar 20 communicate with each other and do not directly act on the plurality of fixing adjustment bolts 34 and 36.

<2> Bending force When a bending force acts on the joint between the support pile 10 and the support column 20 on which the compression axial force always acts, the strength of the joint socket 30 resists the bending force.
Specifically, the bending force can be transmitted between the support pile 10 and the support column 20 through the fixing adjustment bolts 34 and 36 and the different diameter cylinder body 35, and the strength of the joint socket 30 resists the bending force.
Since the plurality of fixing adjustment bolts 34 and 36 screwed to the peripheral surfaces of both cylinders 31 and 32 at equal intervals come into contact with the outer peripheral surfaces of both cylinders 31 and 32 and restrain the free deformation of both cylinders 31 and 32. Even if a bending force is applied to the different diameter cylinder body 35, the circular shape of both cylinders 31 and 32 is maintained.
As described above, under the condition that the compression axial force acts on the joint portion, the bending force can be transmitted through the joint socket 30, so that a rational and simple joint structure can be obtained.

Hereinafter, other examples will be described, but in the description thereof, the same parts as those in the above-mentioned Example 1 are designated by the same reference numerals, and the detailed description thereof will be omitted.

A second embodiment will be described with reference to FIG. 7 in which the lower portion of the support column 20 is inscribed in the upper cylinder 32 and joined by using the joint socket 30a configured to be externally possible.

<1> Joint socket The joint socket 30a has a lower cylinder 31 that can be exteriorized via the _first adjustment gap G1 at the upper part of the support pile 10, an upper cylinder 32 that can be exteriorized at the lower part of the support pillar 20, and both cylinders 31. , 32 is provided with a shelf board 33 interposed therebetween and integrated.
The inner diameter D ₂ of the upper cylinder 32 is formed to have the same diameter as or slightly larger than the diameter d ₂ of the support pillar 20, and the lower portion of the support pillar 20 is inscribed in the upper cylinder 32 so that the upper cylinder 32 can be accommodated. It has become.
The inner diameter D ₁ of the lower cylinder 31 is larger than the inner diameter D ₂ of the upper cylinder 32 (D ₁ > D ₂ ), and has a dimensional relationship with the horizontal position of the joint socket 30 and the support column 20 within the range of the first adjustment gap G ₁ . Correcting the angle is the same as in the first embodiment.

<2> Effect of the present embodiment In the second embodiment, in addition to the effect of the first embodiment, the fixing adjustment bolt 36 of the upper cylinder 32 can be omitted, so that the manufacturing cost of the joint socket 30a can be reduced.

In Examples 1 and 2 above, the form in which the steel materials constituting the support pile 10 and the support column 20 are a combination of steel pipes has been described, but the steel material constituting the support pile 10 and the support column 20 has a rectangular cross section other than the steel pipe. The column material or H-shaped steel may be used, and the combination of the steel materials of the support pile 10 and the support column 20 may be a combination of dissimilar steel materials in addition to the combination of the same type of steel materials.
The combination of the support pile 10 and the other steel materials constituting the support column 20 will be illustrated below.

<1> When the support column is a column FIG. 8A shows a combination of dissimilar steel materials to which a column material having a rectangular cross section of the support column 20 is applied to a support pile 10 made of a steel pipe.
In the joining of this example, a joint socket 30c provided with a lower cylinder 31 having a circular cross section, an upper cylinder 32 having a rectangular cross section, and a shelf plate 33 interposed between both cylinders 31 and 32 is used.
The support column 20 housed in the upper cylinder 32 of the joint socket 30c may be fixed by a plurality of fixing adjustment bolts 36 shown in the figure, or may be inscribed in the upper cylinder 32 without using the fixing adjustment bolt 36 and joined. May be good.

<2> When the support column is H-shaped steel FIG. 8 (B) shows a combination of dissimilar steel materials in which the support column 20 is H-shaped steel with respect to the support pile 10 made of steel pipe.
For the joining of this example, the same fitting socket 30b as in FIG. 8A is used.
The support column 20 housed in the upper cylinder 32 of the joint socket 30b may be fixed by a plurality of fixing adjustment bolts 36 shown in the figure, or may be inscribed in the upper cylinder 32 without using the fixing adjustment bolt 36 and joined. good.
When the support column 20 accommodated in the upper cylinder 32 is fixed by a plurality of fixing adjustment bolts 36, spacers 21 and 21 having the same shape as the same space are accommodated in the recessed space formed between the flange of the H-shaped steel and the web. Then, the horizontal position and angle of the support column 20 made of H-shaped steel can be adjusted by using a plurality of fixing adjustment bolts 36 provided on the four sides of the upper cylinder 32.

<3> When the support pile is a column FIG. 9A shows a combination of dissimilar steel materials to which a column material having a rectangular cross section of the support pile 10 is applied to a support column 20 made of a steel pipe.
For joining in this example, a joint socket 30c provided with a lower cylinder 31 having a rectangular cross section, an upper cylinder 32 having a circular cross section, and a shelf plate 33 interposed between both cylinders 31 and 32 is used.
The support pile 10 housed in the lower cylinder 31 of the joint socket 30c may be fixed by a plurality of fixing adjustment bolts 34 shown in the figure, or may be inscribed in the lower cylinder 31 without using the fixing adjustment bolts 34 and joined. May be good.

<4> When the support pile is H-shaped steel FIG. 9B shows a combination of dissimilar steel materials in which H-shaped steel is applied to the support pile 10 with respect to the support column 20 made of steel pipe.
For the joining of this example, the joint socket 30c mentioned above is used to exterior the lower cylinder 31 having a rectangular cross section to the support pile 20 made of H-shaped steel, and the support pillar 20 made of steel pipe to the upper cylinder 32 having a circular cross section. Is inserted.

<5> Effect of the present embodiment In the third embodiment, even if the combination of the support pile 10 and the support column 20 is a combination of a column material other than a steel pipe or a steel material of the same type or a different type of H-shaped steel, the support is supported. By properly using the joint sockets 30a to 30c in which the cross-sectional shape of the lower cylinder 31 or the upper cylinder 32 is changed according to the cross-sectional shape of the pile 10 or the support pillar 20, the support pillar 20 is corrected by correcting the erection error of the support pile 10. It can be joined and is highly versatile.

A fourth embodiment in which a plurality of tension members 40 are additionally arranged in the joint socket 30 will be described with reference to FIG.

<1> Tensile material The tensile material 40 is a tension that axially connects between the lower cylinder 31 of the joint socket 30 and the support pile 10 and the outer peripheral surface, and between the upper cylinder 31 of the joint socket 30 and the outer peripheral surface of the support pillar 20. A strong rod-shaped or rope-shaped tensioning material.
The peripheral surfaces of the lower cylinder 31 and the upper cylinder 32 of the joint socket 30 have tubular brackets 31b and 32b projecting in the circumferential direction, and the outer peripheral surfaces of the support pile 10 and the support pillar 20 are also oriented in the axial direction. Brackets 12, 21 are projected.
A tension member 40 is bridged and connected between the brackets 12, 31b arranged in the axial direction to form a pair and between the brackets 21, 32b, respectively.
A pair of tension members 40, 40 arranged in each axial direction is made into one set, and two or more sets of tension members 40 are evenly spaced along the circumferential direction of the joint socket 30 so as not to interfere with the gap adjusting means (not shown). It is arranged in.

<2> Example of tension material

FIG. 11 shows a form in which nuts 42 are screwed to both ends of the connecting bolts 41 constituting the tension member 40.
Both ends of each connecting bolt 41 having a male thread penetrate through the bolt holes or slits opened in the brackets 12, 21 and the cylinder side brackets 31b, 32b, respectively, and the nut 42 is screwed to the end of each connecting bolt 41. By tightening the bolts, a plurality of tension members 40 are stretched between the lower cylinder 31 of the joint socket 30 and the support pile 10 and the outer peripheral surface, and between the upper cylinder 31 of the joint socket 30 and the outer peripheral surface of the support pillar 20. Can be done.

<3> Action of Tension Material As described above, in this embodiment, a plurality of sets of tension materials 40 are stretched and connected between the joint portion of the support pile 10 and the support column 20 that are butted against the joint socket 30. In addition to the effect of the above embodiment, not only the effect of preventing the support pile 10 and the support column 20 from coming off is enhanced with respect to the joint socket 30, but also the tension member 40 functions as a strength member for tension and bending of the joint portion. , The tensile strength and bending strength at the joint are significantly improved.
In this example, a form in which the tension member 40 is arranged between the outer peripheral surfaces of the lower cylinder 31 and the upper cylinder 32 constituting the joint socket 30 and the outer peripheral surfaces of the support pile 10 and the support pillar 20 will be described. The tension member 40 may be arranged between the upper cylinder 32 of the socket 30 and the outer peripheral surface of the support column 20.
If the tension member 40 is arranged only between the upper cylinder 32 and the outer peripheral surface of the support column 20, the effect of preventing the joint socket 30 from falling when the substructure unit 50 is suspended is enhanced.

10 ... Support pile 20 ... Support pillar 30 ... Joint socket 30a to 30c ... Joint socket 31 ... Joint socket lower cylinder 32 ... Joint socket upper cylinder 33 ... Joint socket Shelf board 34 ... Lower cylinder fixing adjustment bolt 35 ... Different diameter cylinder body 36 ... Upper cylinder fixing adjustment bolt 40 ... Pulling material 41 ... Connecting bolt 42 ... Nut 50 ...・ ・ Substructure unit 51 ・ ・ ・ Girder material 52 ・ ・ ・ Breath material 60 ・ ・ ・ Superstructure 61 ・ ・ ・ Beam girder 62 ・ ・ ・ Lining plate D ₁・ ・ ・ First adjustment gap D ₂・ ・ ・2nd adjustment gap

Claims (8)

It is a construction method of a temporary bridge that is constructed by extending a support pillar on the upper part of a support pile.
A cylindrical different-diameter cylinder body that can be exteriorized across the butt portion of the support pillar on the upper part of the support pile, and multiple fixing adjustments that can be screwed onto the different-diameter cylinder body and press the outer peripheral surface of the support pile or support pillar. The different diameter cylinder body is provided with bolts, and the lower cylinder that can be exteriorized to the support pile, the upper cylinder that can be exteriorized to the support pillar, and the boundary between the lower cylinder and the upper cylinder located on the coaxial line are interposed. Use a cylindrical joint socket with a stakeout and a stakeout
The lower or upper cylinder of the different diameter cylinder body so that an adjustment gap is formed between at least one of the lower cylinder and the upper cylinder formed of different diameters and the peripheral surface of the support pillar or the support pile. The inner diameter of either one is larger than the inner diameter of either the lower cylinder or the upper cylinder.
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
The process of assembling a substructure unit that has a gate shape including multiple support columns, and
When assembling the substructure unit to the ground, the process of externally assembling the upper cylinder of the joint socket to the end of each support column and the process of assembling.
The lower cylinder of the joint socket of the lifted substructure unit is attached to the existing support pile, and the joint socket is positioned and installed by interposing a shelf plate between the upper end of the support pile and the lower end of the support column. The process of extending the support pillars to the support piles of
In order to correct the construction error of the support pile, the plurality of fixing adjustment bolts are rotated to obtain reaction force from the existing support pile and formed between the lower cylinder of the joint socket and the peripheral surface of the support pile. The process of adjusting the adjustment gap and
It is provided with a step of tightening the fixing adjustment bolt to rigidly connect the support column and the upper cylinder of the joint socket in a non-displaceable manner.
It is characterized in that a temporary bridge is constructed by repeating each of the above steps.
Construction method of temporary bridge. The method for constructing a temporary bridge according to claim 1, wherein the plurality of fixing adjustment bolts are taken in and out to maintain the horizontal position and the erection angle of the support column adjusted within the range of the adjustment gap. The lower cylinder and the upper cylinder of the different diameter cylinder main body are provided with a plurality of fixing adjustment bolts in the height direction, and the horizontal position and standing of the support column adjusted within the adjustment gap by inserting and removing the plurality of fixing adjustment bolts. The method for constructing a temporary bridge according to claim 1 or 2, wherein the installation angle is maintained. The method for constructing a temporary bridge according to claim 1, wherein the inner diameter of the lower cylinder of the joint socket has a dimensional relationship larger than the inner diameter of the upper cylinder. The method for constructing a temporary bridge according to claim 1, wherein the upper cylinder of the joint socket has a dimensional relationship that allows inscribed to the support column. 1. The substructure unit includes a plurality of support columns, a girder member erected between the heads of the plurality of support columns, and a breath member erected between the side surfaces of the plurality of support columns. Construction method of temporary bridge described in. Any of claims 1 to 5, wherein the joint socket and the outer peripheral surface of the support pile or the joint socket and the outer peripheral surface of the support column are connected and reinforced via a plurality of tension members. The construction method of the temporary bridge described in item 1. The support pile is one of steel pipes, column materials, or H-shaped steel, the support pillar is any one of steel pipe, column material, or H-shaped steel, and the support pile or support pillar is of the same type steel material. The method for constructing a temporary bridge according to any one of claims 1 to 6, wherein the method is a combination or a combination of dissimilar steel materials.

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