JP3921512B2 - Bridge support - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a support for a bridge used when placing a concrete floor of a steel bridge on site, and in particular, a support that is interposed between left and right I-shaped main girders that support a floor form. About.
[0002]
[Prior art]
In recent years, in the structural design of steel bridges, there is a tendency to increase the cross section of the I-shaped main girder and reduce the number of main girder. As a result, the distance between the main girder and the overhanging dimension from the main girder increase, and the concrete of the floorboard The thickness is also thicker than conventional bridges.
[0003]
FIG. 7 shows a support method for a bridge floor plate that has been conventionally used. In this figure, reference numeral 1 denotes an I-shaped main girder, which is disposed on both the left and right sides so as to support the formwork 3 of the bridge floor plate 2 as a whole. Reference numeral 4 denotes a floor plate driving beam between the main girders 1 and 1, which is bridged between upper ends of pipe supports 5 and 5 installed inside the main girders 1 and 1, respectively. Reference numeral 6 denotes a lateral arm member disposed below the projecting portion 3a of the floor plate mold 3 projecting from the main girder 1, and one end of the lateral arm material 6 is connected to the upper flange 1b of the I-shaped main girder 1. The other end side of the horizontal arm member 6 is supported by a support 7 having a lower end pivoted to a corner between the lower end of the web 1a of the main girder 1 and the lower flange 1c. Is supported by a chain 8 attached to the upper end of the web 1a of the main beam 1.
[0004]
[Problems to be solved by the invention]
In this conventional bridge floor support, when concrete is placed with a large concrete thickness and a large gap between the main girders 1 and 1 as described above, a situation that cannot be dimensionally handled occurs. Even if the size can be accommodated, the installation interval must be narrowed due to insufficient strength, which requires a large amount of equipment, resulting in an increase in construction costs. Further, when placing concrete, a horizontal tension is generated by the load applied to the projecting portions 3a and 3a of the mold 3 so as to cause the main girders 1 and 1 to fall outward. The web 1a may be deformed.
[0005]
SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a bridge support structure that can cope with an increase in the distance between the left and right main girders and a weight of the floor board and prevents the web of the main girders from being deformed. For the purpose.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a supporting work interposed between the left and right I-shaped main girders 1 and 1 for supporting the floor board formwork 3 when the bridge floor board 2 is placed in concrete. One end of each of the two diagonal members 12, 13 having at least one adjustable length is joined to both ends of the beam member 10 which can be adjusted in length, and the other ends of the two diagonal members 12, 13 are joined to each other. By forming the inverted triangular trusses 9 and connecting the plurality of inverted triangular trusses 9 at the ends of the beam members 10 of the trusses 9 via the connector 15 that can be finely adjusted in length, A series of truss beams 17 are formed, and both ends of the truss beams 17 are pivotally attached to the upper portions of the left and right main girders 1 and 1, respectively.
[0007]
Claim 2 is the bridge support work according to claim 1, wherein the connecting tool 15 is fixed to one end of one of the facing beam members 10, 10 of the adjacent trusses 9, 9. It is characterized by comprising a nut 41 and a connecting bolt 42 inserted through the end of the other beam member and screwed into the nut 41.
[0008]
A third aspect of the present invention is the bridge support structure according to the first or second aspect, wherein the suspension bolt 36 is suspended from the mounting bracket 35 fixed to the upper surface of the upper flange 1b of the I-shaped main girder 1, and the suspension bolt 36 is The structure is characterized in that each end portion of the truss beam 17 is supported through a receiving nut 37 screwed into the lower end portion of the suspension bolt 36 through a vertical through hole provided at each end portion of the truss beam 17. To do.
[0009]
According to a fourth aspect of the present invention, in the bridge support work according to the third aspect, each end portion of the truss beam 17 is pivotally connected to the upper end portion of the web 1a of each main girder 1 via a tension fitting 38. It is characterized by.
[0010]
According to a fifth aspect of the present invention, in the bridge support structure according to the first or second aspect, the metal fitting 21 is bolted to the upper end of the web 1a of the I-shaped main girder 1 so that the vertical mounting position can be adjusted. A receiving bolt 24 that is screwed into a nut 33 fixed to the upper end of the truss beam 17 is supported by the receiving bolt 24, and a vertically long hole 25 provided in the receiving bracket 21. The lateral movement of the truss beam 17 is restricted by a bolt 26 inserted into a lateral through hole provided at the end of the truss beam 17.
[0011]
Claim 6 is the bridge support structure according to claim 3 or 5, wherein the upper end of the truss beam 17 is pressed against the lower surface of the upper flange 1b of the I-shaped main beam 1 on the upper surface of the end of the truss beam 17. It is characterized by projecting.
[0012]
In the bridge support structure according to any one of claims 1 to 6, the beam member 10 of each truss 9 is slid into the outer cylinder member 10a and the outer cylinder member 10a having a rectangular tube shape. It is composed of an inner cylinder member 10b that can be inserted and extended with respect to the outer cylinder member 10a, and both members 10a and 10b are fixed by pins 11 at a required length position.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a front view showing the entire bridge support S1 of the present invention, FIG. 2 is an enlarged front view of the center of the support, and FIG. 3 is an enlarged front view of the end of the support. In these figures, reference numeral 9 denotes an inverted triangular truss forming the truss beam 17, and one end of each of two diagonal members 12, 13 each having a length adjustable at both ends of the length adjustable beam member 10. It is formed by joining the other parts of the diagonal members 12, 13 together. Thus, a plurality of such inverted triangular trusses 9, here two, are connected to the ends of the beam members 10 of the inverted triangular trusses 9 via a connecting tool 15 whose length can be adjusted steplessly. Thus, a series of truss beams 17 is formed, and both left and right ends of the truss beams 17 are pivotally attached to the upper portions of the main girders 1 and 1 arranged opposite to the left and right sides, as shown in FIG. It is support work S1 which concerns on this invention.
[0014]
As shown in FIG. 1, the formwork 3 of the bridge floor board 2 is mounted on both the left and right main girders 1 and 1, and the projecting portion 3a of the formwork 3 projecting outward from each main girder 1 is detailed. Although the description is omitted, it is supported by a support S2 for the formwork overhanging portion partially shown by phantom lines in FIG. Reference numeral 6 denotes a lateral arm material that constitutes a part of the support for the formwork overhanging portion S2, and is disposed below the formwork overhanging portion 3a.
[0015]
The structure of the support S1 according to the present invention will be described in more detail. First, the beam member 10 of each inverted triangular truss 9 is slidable within the outer cylindrical member 10a and a rectangular outer cylindrical member 10a. The pin 11 (see FIG. 4A) is inserted into the overlapped portion of the members 10a and 10b at the required length position. Thereby, both members 10a and 10b can be fixed and adjusted to the approximate length. Then, one end of each of the fixed length diagonal member 12 and the adjustable length diagonal member 13 is pin-connected to the outer end side of the outer cylinder member 10a and the outer end side of the inner cylinder member 10b. At the same time, the other end portions of the diagonal members 12, 13 are pin-joined to the bracket 14, thereby forming an inverted triangular truss 9 as shown in FIG. The inverted triangular truss 9 is reinforced by a reinforcing bar 16 that connects the inner end of the outer cylinder member 10 a and the bracket 14.
[0016]
The other diagonal member 13 whose length is adjustable is composed of a main pipe 13a and a sub pipe 13b that is slidably inserted into the main pipe 13a and fixed by a pin (not shown) at a required length position. As shown in FIG. 2, the outer end portion of 13a is connected to a bracket 40A or 40B attached to the outer end portion of the inner cylindrical member 10b of the beam member 10 via a connector 45 that can be finely adjusted in length steplessly. The outer end of the secondary pipe 13b is bolted to the bracket 14 which is the top of the inverted angle truss 9. Therefore, the rough length of the diagonal member 13 is adjusted by sliding the main pipe 13a and the sub pipe 13b with each other and fixing them with the pins, and the fine adjustment is performed by the connector 45.
[0017]
As shown in FIG. 2, the bracket 40 </ b> A is attached to the outer end portion of the inner cylinder member 10 b constituting the beam member 10 of one truss 9, and the bracket 40 </ b> B is a beam of the other truss 9. The brackets 40A and 40B are attached to the outer end portion of the inner cylinder member 10b constituting the material 10, and are formed in a substantially L shape as shown in the figure, and are horizontally formed at the tip portion. In the state in which the notches 40a and 40b are extended and the ends of the beam members 10 and 10 of the trusses 9 and 9 are connected to each other by the connector 15, the inner ends of the notches 40a and 40b are connected to each other. The support shaft 47 projecting from the upper end portion of the support leg 46 that supports the truss beam 17 at its center is inserted into the overlap portion 40c. The support leg 46 is erected on a joist member 56 placed at the center of the connecting member 55 that connects the lower ends of the left and right main girders 1, 1. A jack 57 for adjusting the height is provided.
[0018]
Therefore, the truss beam 17 composed of the two trusses 9 and 9 is supported at a predetermined height position by the support shaft 47 that enters the overlapping portion 40c of the notch grooves 40a and 40b of the brackets 40A and 40B at the central connection portion. In this state, the length of the connecting portion can be finely adjusted by the connecting tool 15 that connects the trusses 9 and 9 together.
[0019]
As shown in FIG. 2, the connecting member 15 that connects the two trusses 9 and 9 constituting the truss beam 17 in a stepless manner is adjustable. The fixed nut 41 fixed to the end of one inner cylinder member 10b of the ten and ten inner cylinder members 10b, 10b, and inserted through the end of the other inner cylinder member 10b and screwed into the nut 41. The connecting bolt 42 includes a rotation operation nut 44 fixed to an intermediate portion of the bolt 42. The fixing nut 41 is attached to an attachment frame piece 43B attached to an end portion of one inner cylinder member 10b. The connection bolt 42 is fixed by welding, and is inserted from the inside into the bolt insertion hole 43a of the attachment frame piece 43A attached to the end of the other inner cylinder member 10b, and screwed into the fixing nut 41. Therefore, by rotating the connecting bolt 42, the length of the connecting portion of the trusses 9 and 9 can be finely adjusted steplessly.
[0020]
Further, as shown in FIG. 2, a connecting tool 45 for connecting the diagonal member 13 in a steplessly adjustable manner is a nut fixing 51 fixed to the outer end portion of the main pipe 13a of the diagonal member 13 by welding, From a connecting bolt 52 screwed into the nut 51 inserted from the side of the mounting piece 48 fixed to the brackets 40A and 40B by the bolt 49, and a rotation operation nut 54 fixed to an intermediate portion of the bolt 52 Thus, the length of the diagonal member 13 can be finely adjusted by rotating the connecting bolt 52.
[0021]
4A is a cross-sectional view of the outer cylinder member 10a constituting the beam member 10 of each inverted triangular truss 9, and FIG. 4B is a cross-sectional view of the inner cylinder member 10b. The outer cylinder member 10a is made of an extruded material of an aluminum alloy, has a vertically long rectangular cross section as shown in the figure, and forms concave portions 18 and 18 over the entire length on both side surfaces, and has a lower end surface. The protruding strips 19, 19 are formed over the entire length at both ends. The inner cylinder member 10b is also made of an extruded material of an aluminum alloy, has a vertically long rectangular cross section as shown in the figure, and has concave grooves 20, 20 formed over the entire length on both side surfaces. In the state shown in the phantom line of FIG. Further, as shown in FIG. 1, a plurality of pin holes m are provided at a short pitch on the inner end side of the outer cylinder member 10a, and a plurality of similar pin holes n are provided at a long pitch on the inner cylinder member 10b. Then, by inserting the pin 11 (see FIG. 4A) from the pin hole m of the outer cylinder member 10a into the pin hole n of the inner cylinder member 10b, both the members 10a and 10b are fixed. .
[0022]
FIG. 3 shows an example of a pivoting structure in which the outer end portion of the beam member 10 of each truss 9 that is the end portion of the truss beam 17 is pivotally attached to the upper portion of the main girder 1. This pivot attachment structure is of a receiving metal type, and the receiving metal 21 is fixed to the upper end of the web 1a of the main girder 1 with bolts 22 and nuts 27 so that the vertical mounting position can be adjusted. The lower end side of the outer cylindrical member 10a is supported by a receiving bolt 24 that is screwed into the nut 33 and is movable up and down, and the vertically long hole 25 provided in the receiving bracket 21 and one end of the outer cylindrical member 10a. The lateral movement of one end portion of the outer cylinder member 10a is restricted by a bolt 26 and a nut 28 (see FIG. 5) inserted through a lateral through hole (not shown) provided in the inner cylinder.
[0023]
As shown in FIG. 5, the bracket 21 is formed by projecting a base plate 21 b at the lower front surface of the mounting substrate 21 a and projecting side plates 21 c and 21 c on both left and right sides above the base plate 21 b. The mounting board 21a is provided with a plurality of bolt insertion holes 29 at intervals in the vertical direction, nuts 23 are fixed on the base plate 21b by welding, and the vertical holes 25 are provided in the left and right side plates 21c. Moreover, the bolt insertion hole 30 (refer FIG. 2) which penetrates the volt | bolt 22 is provided in the web 1a upper end part of the main girder 1. As shown in FIG.
[0024]
When mounting the bracket 21, the bolt 21 is tightened with a nut 27 through a bolt 22 from a required bolt insertion hole 29 of the mounting substrate 21 a to a bolt insertion hole 30 at the upper end of the web 1 a of the main girder 1. Attach and fix the upper end of the web 1a of the beam 1 at the required position. The outer end portion of the outer cylindrical member 10a of the beam member 10 is inserted between the left and right side plates 21c, 21c of the fitting 21 thus attached, and the outer cylinder is inserted from the vertically long hole 25 of the side plate 21c as shown in phantom lines in FIG. The bolt 26 is inserted into the bolt insertion hole of the member 10a and is prevented from being removed by the nut 28. The receiving bolt 24 is screwed into the nut 23 fixed on the base plate 21b from below, and the tip of the receiving bolt 24 is inserted. The lower surface of the outer end portion of the outer cylinder member 10a is supported by the portion. By rotating the receiving bolt 24 in this state, the vertical height of the outer end portion of the outer cylindrical member 10a can be adjusted.
[0025]
As shown in FIG. 3, a sheet material 31 such as neoprene rubber is provided on the back surface of the mounting substrate 21 a that comes into contact with the web 1 a of the main girder 1 when the bracket 21 is mounted, in order to protect the painted surface of the main girder 1. Is attached. A backing plate 32 is attached to the lower surface of the outer end portion of the outer cylinder member 10a against which the upper end portion of the receiving bolt 24 comes into contact. Further, on the upper surface of the outer end portion of the outer cylinder member 10a, a projecting bolt 33 that presses against the lower surface of the upper flange 1b of the main girder 1 protrudes. When the fine adjustment of the entire support work is completed, the contact bolt 33 presses the upper end of the support bolt 33 against the lower surface of the upper flange 1b of the main girder 1 so that the overall form of the support work is stabilized. It is intended to be able to hold. A suction cup 34 is attached to the upper end of the contact bolt 33 so as to be attracted to the lower surface of the upper flange 1b.
[0026]
FIG. 6 shows another example of a pivoting structure in which the end of the truss beam 17 is pivotally coupled to the upper part of the main beam 1. The pivot structure is a suspension bolt system. A suspension bolt 36 is suspended from a mounting bracket 35 fixed to the upper surface of the upper flange 1b of the main girder 1 by welding, and the suspension bolt 36 is attached to the outer end of the outer cylinder member 10a. The outer end portion of the outer cylindrical member 10a is supported through a receiving nut 37 that is threaded into a lower end portion of the suspension bolt 36 through a vertical through hole (not shown) provided in the portion.
[0027]
In the case of this suspension bolt system, since a horizontal force acts on the suspension bolt 36, the outer end portion of the outer cylinder member 10a is pivotally connected to the upper end portion of the web 1a of the main girder 1 via a tension fitting 38, The horizontal force applied to the suspension bolt 36 can be dealt with. One end portion of the tension fitting 38 is bolted to the outer cylinder member 10a, and the other end portion is bolted to a mounting plate 39 fixed to a corner portion of the web 1a of the main girder 1 and the upper flange 1b. In addition, as in the case of the metal fitting system shown in FIG. 3, a contact bolt 33 that presses against the lower surface of the upper flange 1 b of the main girder 1 projects from the upper surface of one end portion of the outer cylinder member 10 a.
[0028]
As described above, the support S1 of the present invention is configured such that the plurality of inverted triangular trusses 9, for example, two, are connected to the ends of the beam members 10 of the trusses 9 via the connector 15 that can be finely adjusted in length. A series of truss beams 17 are formed by connecting with each other, and both ends of the truss beams 17 are pivotally attached to the upper portions of the left and right main girders 1 and 1, respectively. When placing the bridge floor plate form 3 on the left and right main girders 1 and 1 and placing concrete, the projecting portions 3a and 3a of the form frame 3 projecting outward from the left and right main girders 1 and 1, respectively. In the case where horizontal tension is generated by the load applied to the main girders 1 and 1 so that the webs 1a of the main girders 1 are warped outwardly. The connector 15 connecting the end portions of the ten parts is tightened in advance, and the right and left main parts are connected by the connector 15. By pulling 1 and 1 to each other, the outward horizontal tension generated by the load applied to the mold projecting portions 3a and 3a and the inward horizontal tension by the connector 15 cancel each other. The deformation of the web 1a of the beam 1 can be prevented.
[0029]
Further, each truss 9 of this truss beam 17 is joined to both ends of a beam member 10 whose length can be adjusted, one end of each of two diagonal members 12 and 13 whose length can be adjusted. Since the other end portions of the members 12 and 13 are joined to each other, even if the distance between the main girders 1 and 1 is increased, it is possible to cope with it. The supporting structure has a strength that can sufficiently cope with an increase in burden load accompanying an increase in the distance between the ones.
[0030]
In this case, since the beam member 10 constituting the truss 9 is configured to be adjustable in length by a rectangular tube-shaped outer tube member 10a and a rectangular tube-shaped inner tube member 10b fitted thereto, The material 10 can be simplified, and the structure can be made compact and stable in strength.
[0031]
Further, as a pivoting structure that pivots the outer end portion of the outer cylindrical member 10a, which is one end portion of the beam member 10 constituting the truss 9, to the upper portion of the main girder 1, as shown in FIG. Although the suspension bolt system as shown in FIG. 6 is prepared, the structure is somewhat complicated according to the metal fitting system, but the outer end portion of the outer cylinder member 10a can be moved to the required angular position without rattling. It can be pivoted accurately, and according to the suspension bolt system, the structure becomes simple and the mounting work becomes easy.
[0032]
In addition, since the contact bolt 33 protrudes from the upper surface of the outer end portion of the outer cylinder member 10a constituting the beam member 10, the upper end portion of the bolt 33 is shown at the stage when the fine adjustment of the entire support work is completed. As shown in FIGS. 3 and 6, by pressing against the lower surface of the upper flange 1 b of the main girder 1, the form of the entire support work can be held in a stable state.
[0033]
In this embodiment, the inverted triangular truss 9 is composed of a beam material 10 that can be adjusted in length, and two diagonal members 12 and 13 that are a fixed length diagonal member 12 and an adjustable length diagonal member 13. However, the two diagonal members 12 and 13 may both be configured to be adjustable in length, so that all three sides of the triangle of the truss 9 can be extended, and the inverted triangular truss 9 is similar. Can be expanded stably.
[0034]
【The invention's effect】
According to the support structure of the invention according to claim 1, when placing the concrete of the bridge floor plate on the left and right main girders and placing the concrete, the overhang of the formwork projecting outward from the main girders, respectively. If the horizontal tension that tries to tilt both main girders outwards due to the load on each part occurs and the web of each main girder deforms, connect the ends of the beam members of the truss By tightening the connecting tool in advance and pulling the two main girders together with this connecting tool, the outward horizontal tension generated by the load on the formwork overhanging part and the inward by the connecting tool The horizontal tension cancels out and deformation of the main girder web can be prevented.
[0035]
In addition, each truss of the truss beam is joined to one end of each of the two diagonal members, at least one of which is adjustable in length, at both ends of the beam member whose length can be adjusted, and the other ends of the two diagonal members are connected to each other. Because it is formed by joining, even if the distance between main girders increases, it is possible to cope with it, and it is sufficient to increase the burden load accompanying the increase in the distance between main girders. It will be a supporting structure with the strength that can be handled.
[0036]
According to a second aspect of the present invention, the connecting tool includes a fixing nut fixed to one beam member end of the beam members facing each other between adjacent trusses, and a nut inserted through the other beam member end. Since it is composed of a connecting bolt to be screwed in and the structure is extremely simple, the cost is low and the handling is simple and easy.
[0037]
As defined in claim 3, a suspension bolt is suspended from a mounting bracket fixed to the upper surface of the upper flange of the I-shaped main girder, and the suspension bolt is passed through a vertical through hole provided at each end of the truss beam. Adopting a suspension bolt system that supports each end of the truss beam via a receiving nut screwed to the lower end of the suspension bolt, the pivotal structure of one end of the lateral arm material relative to the upper part of the main girder is simplified. The mounting work becomes easy.
[0038]
As described in claim 4, the horizontal force acting on the suspension bolt can be sufficiently dealt with by pivotally connecting each end of the truss beam to the upper end of the web of each main girder via a tension fitting. it can.
[0039]
As described in claim 5, if the receiving bracket system is adopted as the pivotal structure of the end of the truss with respect to the upper part of the main girder, the end of the horizontal arm material is not rattled and the required angle position is accurately obtained. Can be pivoted.
[0040]
As described in claim 6, when the fine adjustment of the whole support work is completed by projecting a contact bolt on the upper surface of one end portion of the horizontal arm member, the upper end portion of the bolt is connected to the upper flange lower surface of the main girder. By pressing against, the form of the entire support work can be held in a stable state.
[0041]
The beam member constituting the truss is a rectangular tube-shaped outer tube member and an inner tube member that is slidably inserted into the outer tube member and expands and contracts with respect to the outer tube member. Since both members are fixed with pins at a required length position, the beam material can be made simple, compact and stable in strength, and can be handled easily and easily.
[Brief description of the drawings]
FIG. 1 is a side view showing an entire support work according to the present invention.
FIG. 2 is an enlarged view of the central part of the support work.
FIG. 3 is an enlarged view of an end of the support work.
4A is a cross-sectional view of an outer cylinder member constituting a beam member of a truss, and FIG. 4B is a cross-sectional view of an inner cylinder member.
FIG. 5 is an enlarged front view of the receiving metal fitting shown in FIG. 3;
FIG. 6 is a side view showing a suspension structure of a suspension bolt system in which an outer end portion of an outer cylinder member constituting a beam member of a truss is pivotally attached to an upper part of a main girder.
FIG. 7 is a schematic side view showing a conventional bridge floor support.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 I type main girder 1a Main girder web 1b Main girder upper flange 1c Main girder lower flange 2 Concrete floor board 3 Floor board formwork 3a Overhang part S1 floor support formwork Inverted triangular truss 10 Truss of truss Beam material 10a Beam material outer tube member 10b Beam material inner tube member 12 Fixed length of diagonal material 13 Adjustable length of diagonal material 15 Connector 17 Truss beam 21 Receiving bracket 23 Fixing nut 24 Receiving bolt 33 Retaining bolt 36 Hanging bolt

Claims (7)

When placing the floor of the bridge into the concrete, it is a support work interposed between the I-shaped main girders on both the left and right sides that support the floor board formwork,
By connecting one end of each of the two diagonal members, at least one of which can be adjusted in length, to the both ends of the adjustable beam member, and joining the other ends of the two diagonal members, an inverted triangular truss A series of truss beams are formed by connecting a plurality of inverted triangular trusses at the ends of the beam members of each truss via a connector whose length can be finely adjusted. The bridge support work is made by pivoting both ends of the frame to the upper part of the left and right main girders. The connecting tool includes a fixing nut fixed to one end of the beam members facing each other between adjacent trusses, and a connecting bolt inserted through the other end of the beam member and screwed into the nut. The bridge support according to claim 1, comprising: A hanging bolt is suspended from a mounting bracket fixed to the upper surface of the upper flange of the I-shaped main girder, and this hanging bolt is threaded into the lower end of the hanging bolt through the vertical through-holes provided at each end of the truss beam. The bridge support according to claim 1 or 2, wherein each end of the truss beam is supported via a receiving nut. The bridge support according to claim 3, wherein each end of the truss beam is pivotally connected to the upper end of the web of each main girder via a tension fitting. A bolt is fastened to the upper end of the web of the I-shaped main girder so that the vertical mounting position can be adjusted, and a bolt that can be moved up and down by being screwed to a nut fixed to the bracket is provided. The lateral movement of the truss beam is regulated by bolts that support the lower surface of the end of the truss beam and that are inserted into a vertically long hole provided in the metal fitting and a lateral through hole provided in the truss beam end. Item 3. Bridge support according to item 1 or 2. The bridge support according to claim 3 or 5, wherein an abutting bolt for pressing the upper end of the bolt against the lower surface of the upper flange of the I-shaped main girder is projected on the upper surface of the end of the truss beam. The beam material of each truss is composed of a rectangular tube-shaped outer cylinder member and an inner cylinder member that is slidably inserted into the outer cylinder member and expands and contracts with respect to the outer cylinder member. The bridge support according to any one of claims 1 to 6, wherein the member is fixed with a pin.

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