JP2018096042A - Main girder for bridge, bridge having same main girder, and bridge construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a main girder for a bridge that can be easily assembled.SOLUTION: A main girder 1 is comprised of a plurality of a BH steel 2 connected in the longer direction. Each of the BH steel 2 comprises a projecting part 21a provided on a tip area of a web 21 which protrudes towards the BH steel 2 on a mating side and overlaps the web 21 on the mating side. Each of the projecting part 21a is provided with a mutually overlapping round hole 21b. A cylinder-shaped fastening pin 21c is inserted in each of the overlapping round hole 21b to connect both BH steel 2 to form the main girder 1 of a bridge.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a main girder of a bridge, a bridge provided with the main girder, and a method for constructing the bridge, and more particularly to a main girder that can be easily assembled, a bridge provided with the main girder, and a method for constructing the bridge.

In recent years, large-scale natural disasters such as earthquakes, typhoons, heavy rains, landslides, etc. have occurred frequently all over the world, and many temporary bridges are needed as emergency replacement bridges or restoration projects from such disasters. Yes. Many proposals have been made on the structure and construction method of this temporary bridge (see, for example, Patent Document 1).
In these temporary bridges, the main girder placed on the pier is assembled by connecting a plurality of steel members in the longitudinal direction, and a lining plate is installed on the main girder to assemble the superstructure of the pier.

  In the connection of the steel materials, as shown in FIG. 15, the tips of the steel materials 102 to be connected are connected at the upper flange 122, the web 121 and the lower flange 123. In connection with the separate web 121, the connection plate 121a is applied to the side surface of the web 121, and is connected by a plurality of bolts and nuts. Thus, when connecting the web 121, a large number of bolts (64 in FIG. 15B) must be tightened, and much labor is required for assembling the main beam 101. FIG. 16 shows a schematic overall view of the temporary bridge. The main girder 101 is placed on the cast steel pipe pile 131, and the steel pipe piles 131 are reinforced with horizontal beams 135 and oblique beams 136.

JP 2012-207516 A

  The present invention has been made to solve the above-described problems of the prior art, and provides a main beam that can be easily assembled. Moreover, the bridge provided with this main girder and the construction method of this bridge are provided.

The invention according to claim 1 is a main girder in which a plurality of steel materials having an upper flange, a lower flange, and a web used in a superstructure of a bridge are connected in the longitudinal direction, and one of the steel materials to be connected; Each steel material is aligned with the other steel material in a state where the web stands in the vertical direction, and each steel material has an abutment surface on which the respective steel material tips abut each other on the top flange tip, and the abutment Bolts provided on the surface, and the respective contact surfaces are connected to each other by bolts and nuts. Each steel material protrudes from the mating steel material and overlaps the mating web. In the region, each of the protrusions is provided with one round hole that overlaps each other, and a cylindrical fixing pin is inserted into each of the overlapped round holes to connect both steel materials. Steel has a plurality of bolt holes in the tip region of the lower flange. There is a connection plate applied over both steel materials on at least one of the upper surface side and the lower surface side of the lower flange, and the connection plate has bolt holes that overlap the bolt holes of the lower flange, The present invention relates to a bridge main girder characterized in that a flange and the connection plate are connected by a bolt and a nut.
BH steel, H-section steel, or the like can be used as the steel material.

  In the invention according to claim 2, the protruding portion of one steel material has two protruding portions that sandwich the protruding portion of the other steel material in the thickness direction of the web, and between the two protruding portions. A protrusion of the other steel material is inserted, and the fixing pin is inserted into the round hole of the two protrusions of the one steel material and the round hole of the protrusion of the other steel material. The main girder of the bridge according to claim 1.

  The invention according to claim 3 is characterized in that a plate is sandwiched between the contact surface of the one steel material and the contact surface of the other steel material. Concerning the main girder of the bridge.

  An invention according to claim 4 relates to a bridge comprising the main girder according to any one of claims 1 to 3.

  The invention according to claim 5 is a bridge construction method, wherein a plurality of steel materials having an upper flange, a lower flange, and a web are connected in a longitudinal direction, and a main girder assembling step for assembling a long main girder, A steel pipe pile driving process in which a plurality of steel pipe piles are driven in the bridge width direction at both ends of the bridge direction in the bridge area where the main girder is bridged, and the head of the steel pipe pile placed is covered with a pile head cap and fixed. A pile head cap process, a bridge girder process for installing and fixing a girder extending in the bridge width direction on a pile head cap of the plurality of steel pipe piles placed in the bridge width direction, and bridging the bridge area A main girder process in which the main girder is bridged and fixed between the receiving girder installed at both ends of the direction with a crane, and the main girder assembly process is formed at the top flange tip of the steel material at a construction site Connecting each abutment surface with bolts and nuts A cylindrical pin is inserted into one round hole formed in the protruding portion of the web tip of one steel material to be connected and one round hole formed in the protruding portion of the web tip of the other steel material And a step of connecting the tip regions of the lower flanges of the steel material with a connection plate.

  According to the main girder of the invention of claim 1, the number of bolt tightening portions is reduced, so that the assembly of the main girder is simplified.

  According to the main girder of the invention according to claim 2, since one steel material has two protrusions, it can be easily connected.

  According to the main girder of the invention according to claim 3, the stress distribution applied to the main girder can be obtained by sandwiching a plate having an appropriate thickness between the abutting surface of one steel material and the abutting surface of the other steel material. Can be adjusted.

  According to the bridge of the invention which concerns on Claim 4, manufacture of a bridge becomes easy. In addition, a strong bridge can be expected.

  According to the bridge construction method of the invention according to claim 5, a bridge having a long main girder can be easily constructed.

It is a schematic perspective view before the BH steel connection of the main girder concerning this invention. It is a schematic front view of one BH steel and the other BH steel which comprise the main girder. It is a schematic perspective view after the BH steel connection of the main girder. It is a schematic side view after the BH steel connection of the main girder. It is a figure which shows the construction method of the bridge which concerns on this invention. It is a figure which shows the construction method of the bridge which concerns on this invention. It is a figure which shows the construction method of the bridge which concerns on this invention. It is a figure which shows the construction method of the bridge which concerns on this invention. It is a figure which shows the construction method of the bridge which concerns on this invention. It is a figure which shows the construction method of the bridge which concerns on this invention. It is a schematic perspective view which shows the installation method of the receiving girder in the bridge which concerns on this invention. It is a schematic perspective view which shows the installation method of the main girder in the bridge which concerns on this invention. It is a schematic perspective view which shows the installation method of the main girder in the bridge which concerns on this invention. It is a figure which shows the construction method of the bridge which concerns on this invention. It is a schematic perspective view of the conventional main girder, (a) is a schematic perspective view before steel materials connection, (b) is a schematic perspective view after steel materials connection. It is a schematic side view of the conventional bridge.

(Main girder of the bridge)
A preferred embodiment of a main girder according to the present invention will be described with reference to the drawings (see FIGS. 1 to 4).
The main girder 1 is used for a bridge superstructure, and a BH steel 2 having an upper flange, a lower flange, and a web is connected in the longitudinal direction. The main girder 1 is connected to each other in a state where one BH steel 2 to be connected and the other BH steel 2 stand the web 21 in the vertical direction, and the web 21, the upper flange 22, The lower flange 23 is connected. In this embodiment, BH steel is used as the main girder 1, but it is not limited to BH steel, and for example, H-section steel may be used.

<Upper flange>
The upper flange 22 of each BH steel 2 has a contact surface 22a at which the tips of the respective BH steel 2 come into contact with each other. Each contact surface 22a has a bolt hole 22b through which a bolt is inserted, and each contact surface 22a is connected by a bolt and a nut.
A reinforcing plate 22c for reinforcing the contact surface 22a is provided below the upper flange 22. The reinforcing plate 22c is connected to the contact surface 22a and the web 21 by welding. The shape, thickness, width, and the like of the reinforcing plate 22c may be adjusted according to usage conditions.
Although the number of bolt holes 22b of the upper flange 22 is two in FIG. 1, the number thereof is not limited and may be adjusted according to use conditions.

<Web>
Each of the webs 21 of the BH steel 2 has a protruding portion 21a that protrudes in the direction of the mating BH steel 2 and overlaps the web 21 of the mating BH steel 2 in the tip region. Each projecting portion 21a of the BH steel 2 is provided with one round hole 21b that overlaps each other, and a cylindrical fixing pin 21c is inserted into each of the overlapping round holes 21b to connect both the BH steels 2. The
The fixing pin 21c is rotatable in the round holes 21b of both the BH steels 2, and the rotation of each BH steel 2 is not hindered by the fixing pins 21c.
The peripheral portion 21d of the round hole 21b is thick in order to increase the strength of the web 21 (see FIG. 2).

  In the main girder 1 of FIG. 1, the web 21 of one BH steel 2 has two projecting portions 21 a that sandwich the projecting portion 21 a of the other BH steel in the thickness direction of the web 21. The protrusion 21a of the other BH steel 2 is inserted between the protrusions 21a. The fixing pin 21c is inserted into the round hole 21b of the two protruding portions 21a of one BH steel 2 and the round hole 21b of the protruding portion 21a of the other BH steel 2.

It is desirable that the inner diameter of the round hole 21b is slightly larger than the outer diameter of the fixing pin 21c, and the fixing pin 21c can be rotated without rattling.
In the example of FIGS. 1 and 2, the number of the protruding portions 21a of one BH steel 2 is two, but it may be one.

<Lower flange>
The lower flange 23 of each BH steel 2 has a bolt hole 23a in the tip region 23d, and a connection plate 23b applied across both the BH steels 2 is provided on at least one side of the upper surface side and the lower surface side of the lower flange 23. Have. In FIG. 3, connection plates 23b are provided on both the upper surface side and the lower surface side. The upper and lower connection plates 23b have bolt holes 23c (see FIG. 1) that overlap the bolt holes 23a of the lower flange 23, and the lower flanges 23 and the connection plates 23b of both BH steels 2 are connected by bolts and nuts. .

In the conventional example of FIG. 15, 64 bolts must be tightened for connection on the web, but in this embodiment, only the fixing pin 21c is inserted for connection on the web, and the labor of connection is greatly reduced. can do.
Moreover, the intensity | strength of the main girder 1 increases by making the BH steel 2 into such a structure.
Each web 21 may have a structure having one protrusion 21a. However, as shown in the main girder 1 in FIG. 1, the web 21 of one BH steel 2 is connected to the protrusion 21a of the other BH steel. By having the two protrusions 21a sandwiched in the thickness direction, the connection can be easily made.
What is necessary is just to determine the outer diameter of the fixing pin 21c according to the dimension of the BH steel 2 used, the use of a pier, etc. For example, the outer diameter of the fixing pin 21c is preferably 50 to 300 mm when the height of the BH steel 2 (the length from the outer surface of the upper flange 22 to the outer surface of the lower flange 23) is 1600 mm and the length is 8 m.

  Plates of various thicknesses may be sandwiched between the contact surface 22a of one BH steel 2 to be connected and the contact surface 22a of the other BH steel 2. The stress distribution applied to the main girder 1 can be adjusted by sandwiching a plate having an appropriate thickness.

(Bridge construction method)
Next, an example of an embodiment of a bridge construction method using the main girder described above will be described with reference to the drawings. 5-7 show the construction method of the first pier and the next pier at one end of the bridge at the first stage of implementation, and FIGS. 8-10 show the next pier from the completed pier at the middle stage of construction. The construction method to be constructed is shown.
The construction of the pier is carried out by the following steps.
<Main girder assembly process>
The process of connecting the front ends of the BH steel 2 to be connected and connecting the contact surfaces 22a formed at the front ends of the upper flange 22 with bolts and nuts, and the front end of the web 21 of one BH steel 2 to be connected A cylindrical pin 21c is inserted into one round hole 21b formed in the projecting portion 21a and one round hole 21b formed in the projecting portion 21a at the tip of the web 21 of the other BH steel 2. A step of connecting, and a step of connecting the tip regions of the lower flange 23 of the BH steel 2 with a connecting plate 23b.
In the step of connecting the tip regions of the lower flange 23, the connection plate 23 b that spans both the BH steels 2 is applied to at least one side of the upper surface side and the lower surface side of the lower flange 23, so Then, a bolt is inserted into the bolt hole 23c opened in the connection plate 23b, and the bolt and the nut are connected. This main girder assembly process is performed at the construction site of the bridge.
Since the connection strength between the BH steels 2 in the main girder 1 assembled in this way is high, the main girder 1 can be elongated and can be 10 m or longer. Since the main girder 1 is long, the number of piers can be reduced, and the construction period and cost of bridge construction can be reduced.

<Steel pipe pile placing process>
A plurality of steel pipe piles are placed in the bridge width direction at both ends in the bridge direction in the bridge area where the main girder 1 is bridged.
In the first stage of the implementation shown in FIG. 5, the necessary number of steel pipe piles 31 in the bridge width direction are driven along the conductive material 32 in advance at the first pier position on one end side of the bridge and the next pier position. (See FIG. 5A). In the middle stage of construction of the pier shown in FIGS. 8 to 10, the necessary number of steel pipe piles 31 are placed in the bridge width direction at the pier position next to the existing pier (see FIG. 8A).
There is no limit to the method of pile driving, and the existing method may be used. For example, in the down-the-hole hammer method, a down-the-hole hammer having an enlarged bit is inserted into a steel pipe pile, and drilling and pile driving are simultaneously performed by an auger. If the distance from the crane C to the pile driving position is long and the crane cannot lift the down-the-hole hammer, steel pipe pile, or auger due to the weight, drill the holes with the down-the-hole hammer and the table machine before Steel pipe piles may be built. In addition to the down-the-hole hammer method, various types of pile building methods such as a placement method using a vibrating force using a vibro may be used.
After placing the steel pipe pile 31, the excess pile head is cut and the pile height is set to a predetermined height.

<Pile head cap process>
The pile head cap 33 is covered with the crane C on the head of the cast steel pipe pile 31 and fixed to the pile with bolts from the side of the pile head cap 33 (see FIGS. 5B and 8B). By covering the steel pipe pile 31 with the pile head cap 33, the superstructure can be stably supported.

<Girder process>
A receiving girder 34 extending in the bridge width direction is installed and fixed on the pile head cap 33 of the plurality of steel pipe piles 31 placed in the bridge width direction by the crane C (FIGS. 6A and 9A). reference).
The girder 34 is a girder installed in the width direction of the bridge on the pile head cap 33, and the main girder 1 is installed and fixed on the girder 34.
FIG. 11 is a schematic perspective view of a structure for fixing the receiving girder 34 on the pile head cap 33. Bolt holes are provided in the upper plate of the pile head cap 33 and the receiving girder 34, and are fixed with bolts and nuts.

<Main girder process>
Following the beam receiving step, the horizontal beam 35 and the inclined beam 36 between the steel pipe piles 31 are attached, and the conductive material 32 is removed, and then the main beam 1 is picked up by a crane and installed on the beam beam 34. (See FIG. 6B, FIG. 7, FIG. 9B, and FIG. 10A). The horizontal beam 35 and the oblique beam 36 may be attached according to the situation of the construction site of the bridge, the purpose of the bridge, etc., and may not be attached depending on the conditions.
FIG. 12 shows a schematic perspective view of a structure for fixing the main beam 1 on the receiving beam 34. The leading end of the main beam 1 is placed at the center of the width of the upper surface of the receiving beam 34. Bolt holes are provided in the upper plate of the receiving beam 34 and the lower flange 23 of the main beam 1 and are fixed by bolts and nuts.
At this time, as shown in FIG. 13, a support 37 may be sandwiched between the receiving beam 34 and the main beam 1. As the bearing 37, a known bearing such as a fixed bearing or a movable bearing can be used. For example, a rubber bearing may be used. Absorption of expansion and contraction of the main girder 1 and improvement of earthquake resistance can be achieved.

The main girder assembly process, steel pipe pile driving process, pile head cap process, receiving girder process and main girder process are repeated to extend the bridge and complete the construction.
In addition, as shown in FIG. 14, after constructing both ends of the bridge, a long main girder may be bridged by the crane C.

  The present invention is suitably used for the construction of bridges and roads.

1 Main girder 2 BH steel 21 Web 21a Protruding part 21b Round hole 21c Fixing pin 22 Upper flange 22a Abutting surface 22b Bolt hole 23 Lower flange 23a Bolt hole 23b Connection plate 23c Bolt hole C Crane

Claims (5)

A main girder in which a plurality of steel materials having an upper flange, a lower flange, and a web, which are used for a bridge superstructure, are connected in a longitudinal direction,
One steel material to be connected and the other steel material are fitted with their respective tips in a state where the web stands in the vertical direction,
Each steel material has an abutment surface where the tips of the respective steel materials abut each other at the top end of the upper flange, and a bolt hole provided in the abutment surface, and each abutment surface includes a bolt and a nut. Connected by
Each steel material has a projecting portion that protrudes from the mating steel material and overlaps the mating web in the tip region of the web, and each of the projecting portions is provided with one round hole that overlaps each other. Both steel materials are connected by inserting a cylindrical fixing pin into each of the round holes,
Each steel material has a plurality of bolt holes in the tip region of the lower flange, and has a connection plate applied across both steel materials on at least one side of the upper surface side and the lower surface side of the lower flange, A bridge main girder having a bolt hole overlapping the bolt hole of the lower flange, wherein the lower flange of both steel members and the connecting plate are connected by a bolt and a nut. The protruding portion of one steel material has two protruding portions that sandwich the protruding portion of the other steel material in the thickness direction of the web, and the protruding portion of the other steel material is between the two protruding portions. Inserted,
The bridge main girder according to claim 1, wherein the fixing pin is inserted into a round hole of the two protruding portions of the one steel material and a round hole of the protruding portion of the other steel material.   The bridge main girder according to claim 1 or 2, wherein a plate is sandwiched between the contact surface of the one steel material and the contact surface of the other steel material.   A bridge comprising the main girder according to any one of claims 1 to 3. A construction method for a bridge,
A main girder assembly process for connecting a plurality of steel materials having an upper flange, a lower flange, and a web in the longitudinal direction and assembling a long main girder;
A steel pipe pile driving step of driving a plurality of steel pipe piles in the bridge width direction at both ends of the cross-linking direction in the cross-linking area where the main girder is bridged;
A pile head cap step for covering and fixing a pile head cap on the head of the steel pipe pile placed;
A girder step of installing and fixing a girder extending in the bridge width direction on a pile head cap of the plurality of steel pipe piles placed in the bridge width direction;
A main girder step of fixing the main girder with a crane between receiving girder installed at both ends in the bridging direction of the bridging area,
In the construction site, the main girder assembly process,
Connecting each abutment surface formed at the top flange tip of the steel material with a bolt and a nut;
Insert a cylindrical pin into one round hole formed in the protruding part of the web tip of one steel material to be connected and one round hole formed in the protruding part of the web tip of the other steel material. Connecting and
And a step of connecting tip regions of the lower flanges of the steel material with a connecting plate.

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