CN112326292A - Connecting mechanism for longitudinal beam of railway bridge static load test bed - Google Patents
Connecting mechanism for longitudinal beam of railway bridge static load test bed Download PDFInfo
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- CN112326292A CN112326292A CN202011229099.4A CN202011229099A CN112326292A CN 112326292 A CN112326292 A CN 112326292A CN 202011229099 A CN202011229099 A CN 202011229099A CN 112326292 A CN112326292 A CN 112326292A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing
Abstract
The invention relates to a connecting mechanism for a longitudinal beam of a railway bridge static load test bed, which comprises an upper connecting piece and a lower connecting piece; the upper connecting piece and the lower connecting piece respectively comprise a connecting plate, a top plate and a node plate, the node plate is vertically welded on one surface of the connecting plate, and the top plate is welded on the other surface of the connecting plate in a sticking manner; the upper connecting piece and the lower connecting piece are arranged oppositely up and down and are vertically connected and fixed; the top plates on the upper connecting piece and the lower connecting piece are horizontally arranged side by side alternately to form at least one group of top plate groups, and in each group of top plate groups, the end surfaces of the top plates of the upper connecting piece and the lower connecting piece are mutually opposite along the horizontal direction. The two connecting pieces are adopted, two parts needing to be movably connected are respectively fixed on the two connecting pieces, movable connection can be achieved through bolts, movement in the vertical direction can be avoided, the top plates in the two connecting pieces are alternately arranged side by side and abutted, and movement in the horizontal direction can be avoided, so that the requirement of loading force of a static load test can be met.
Description
Technical Field
The invention relates to a mechanical connecting piece, in particular to a connecting mechanism for a longitudinal beam of a railway bridge static load test bed.
Background
In order to reduce the number of high piers and the overall construction cost, railway bridges of 40 meters are designed by related departments. The original 32-meter bridge static load test bed cannot perform static load bending test on a 40-meter railway bridge. 40103 railway bridge design is based on the consideration that the pier is too high in some areas, and the total construction cost of using 40 meters of bridge will be reduced compared with 32 meters of bridge, from the economic perspective of railway lines, 32 meters and 40 meters should coexist in future, and generally, it is estimated that in the design of future line construction, 40 meters of bridge probably account for 30% of the whole railway line, and the rest are the traditional 32 meters railway bridge, therefore, how to design the longitudinal beam capable of meeting the dead load test of 40 meters of bridge and the dead load test of 32 meters of bridge at the same time is an urgent problem to be solved. The patent with application number 1021810677341.0 can solve the above problems well, but how to design the intermediate node plate to realize the movable connection and satisfy the loading force requirement of the static load test is a problem to be solved at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a connecting mechanism for a longitudinal beam of a railway bridge static load test bed, which can realize the movable connection of the longitudinal beam and meet the requirement of loading force of a static load test.
The technical scheme for solving the technical problems is as follows: a connecting mechanism for a longitudinal beam of a railway bridge static test bed comprises an upper connecting piece and a lower connecting piece; the upper connecting piece and the lower connecting piece respectively comprise a connecting plate, a top plate and a node plate, the node plate is vertically welded on one surface of the connecting plate, at least one top plate is arranged on the top plate, and at least one top plate is welded on the other surface of the connecting plate in an attaching manner; the upper connecting piece and the lower connecting piece are arranged oppositely up and down and are vertically connected and fixed through bolts and matched nuts; the top plates on the upper connecting piece and the lower connecting piece are horizontally and alternately arranged side by side to form at least one group of top plate groups, any group of top plate group consists of one top plate on the upper connecting piece and one top plate on the lower connecting piece, and in each group of top plate groups, the end surfaces of the top plates of the upper connecting piece and the lower connecting piece are oppositely jacked in the horizontal direction; relative to the center of the longitudinal beam, the top plate of the upper connecting plate is located on the outer side, and the top plate of the lower connecting plate is located on the inner side.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, the connecting plates of the upper connecting piece and the lower connecting piece are both provided with at least one screw hole, and the upper connecting piece or the lower connecting piece is also provided with a bolt penetrating through the screw hole and a nut matched with the bolt; when the upper connecting piece and the lower connecting piece are oppositely arranged, the screw hole on the connecting plate of the upper connecting piece and the screw hole on the connecting plate of the lower connecting piece are oppositely formed into a connecting through hole; the bolt penetrates through the connecting through hole and is locked through the nut.
Further, in the upper connecting piece, the screw holes comprise a first screw hole or/and a second screw hole; at least one first screw hole penetrating through the connecting plate is arranged at the position of the connecting plate, which is away from the top plate, or/and at least one second screw hole penetrating through the connecting plate and the top plate is arranged at the position of the connecting plate, which is stacked with the top plate; the structure of the lower connecting piece is the same as that of the upper connecting piece, when the upper connecting piece and the lower connecting piece are oppositely arranged, at least one first screw hole in the upper connecting piece and at least one second screw hole in the lower connecting piece are in one-to-one correspondence and form at least one connecting through hole, or/and at least one second screw hole in the upper connecting piece and at least one first screw hole in the lower connecting piece are in one-to-one correspondence and form at least one connecting through hole; the bolts are provided with at least one, and the bolts penetrate through the at least one connecting through hole in a one-to-one correspondence mode and are locked through nuts.
Furthermore, the upper connecting piece and the lower connecting piece both comprise two vertical plates, the two vertical plates are opposite to the gusset plate and vertically fixed on two side surfaces of the gusset plate, and the two vertical plates are also opposite to the connecting plate and vertically fixed on the connecting plate.
Furthermore, the vertical plate is provided with a fixing hole.
Furthermore, a rib plate is fixed at the joint of the connecting plate and the gusset plate in the upper connecting piece and the lower connecting piece.
Furthermore, four rib plates are arranged, are vertical relative to the gusset plate and are respectively fixed on two sides of the gusset plate close to two ends; the four rib plates are also vertically fixed on the connecting plate relative to the connecting plate.
Further, the extending direction of the node plate is the same as the extending direction of the connecting plate.
The invention has the beneficial effects that: the connecting mechanism for the longitudinal beam of the railway bridge static test bed adopts the two connecting pieces, two parts needing to be movably connected are respectively fixed on the two connecting pieces, the movable connection can be realized through bolts, and the movement in the vertical direction can be avoided.
Drawings
FIG. 1 is a schematic perspective view of an upper connecting piece or a lower connecting piece in a connecting mechanism for a longitudinal beam of a railway bridge static test bed according to the invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a side view of FIG. 1;
FIG. 4 is a top view of FIG. 1;
FIG. 5 is an exploded view of a connecting mechanism for a longitudinal beam of a railway bridge static test bed according to the present invention;
FIG. 6 is a front view of FIG. 5;
FIG. 7 is a side view of FIG. 5;
FIG. 8 is a schematic view of a combination structure of a connecting mechanism for a longitudinal beam of a railway bridge static test bed according to the present invention;
FIG. 9 is a front view of FIG. 8;
FIG. 10 is a side view of FIG. 8;
FIG. 11 is a cross-sectional view of FIG. 9;
FIG. 12 is a schematic plan view of the upper connecting member and the lower connecting member separated from each other in the connecting mechanism for the longitudinal beam of the railway bridge static test bed according to the present invention;
FIG. 13 is a force analysis diagram of a longitudinal beam of the railway bridge static test bed;
FIG. 14 is a force diagram of the node of FIG. 13.
In the drawings, the components represented by the respective reference numerals are listed below:
100. an upper connecting piece, 200, a lower connecting piece, 300, a bolt, 400 and a nut;
1. connecting plate, 2, roof, 3, gusset plate, 4, riser, 51, first screw, 52, second screw, 6, gusset, 7, fixed orifices.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 12, the connecting mechanism for the longitudinal beam of the railway bridge static test bed comprises an upper connecting piece 100 and a lower connecting piece 200; the upper connecting piece 100 and the lower connecting piece 200 respectively comprise a connecting plate 1, a top plate 2 and a node plate 3, the node plate 3 is vertically welded and installed on one surface of the connecting plate 1, at least one top plate 2 is arranged, and at least one top plate 2 is welded on the other surface of the connecting plate 1 in an attaching way (in the figure 12, one top plate 2 is arranged, and the other top plate 2 is welded on the other surface of the connecting plate 1; in the figures 1 to 11, two top plates 2 are arranged, and the two top plates 2 are welded on the other surface of the connecting plate 1 at intervals in an attaching way); the upper connecting piece 100 and the lower connecting piece 200 are arranged oppositely up and down and are vertically connected and fixed through a bolt 300 and a matched nut 400; the top plates 2 on the upper connecting piece 100 and the lower connecting piece 200 are horizontally and alternately arranged side by side to form at least one group of top plate groups, any group of top plate group consists of one top plate 2 on the upper connecting piece 200 and one top plate 2 on the lower connecting piece 200, and in each group of top plate groups, the end surfaces of the top plates 2 of the upper connecting piece 100 and the lower connecting piece 200 are opposite to each other along the horizontal direction; the top plate 2 of the upper connecting plate 100 is located on the outer side and the top plate 2 of the lower connecting plate 200 is located on the inner side with respect to the center of the longitudinal beam (wherein the top plates are used in groups, the top plate of the lower part is located on the inner side, the top plate of the upper part is located on the outer side, and the inner and outer sides are with respect to the center line of the longitudinal beam).
In this embodiment, the following preferred schemes are also included:
preferably, the connecting plate 1 of each of the upper connecting piece 100 and the lower connecting piece 200 is provided with at least one screw hole, and the upper connecting piece 100 or the lower connecting piece 200 is further provided with a bolt 300 penetrating through the screw hole and a nut 400 matched with the bolt 300; when the upper connecting piece 100 and the lower connecting piece 200 are oppositely arranged, the screw hole on the connecting plate 1 of the upper connecting piece 100 and the screw hole on the connecting plate 1 of the lower connecting piece 200 are oppositely formed into a connecting through hole; the bolt 300 is inserted through the coupling through-hole and is fastened by the nut 400.
Further, in the upper connection member 100, the screw holes include a first screw hole 51 or/and a second screw hole 52; at least one first screw hole 51 penetrating through the connecting plate 1 is provided at a position of the connecting plate 1 away from the top plate 2, or/and at least one second screw hole 52 penetrating through the connecting plate 1 and the top plate 2 is provided at a position of the connecting plate 1 stacked on the top plate 2; the structure of the lower connecting member 200 is the same as that of the upper connecting member 100, when the upper connecting member 100 and the lower connecting member 200 are oppositely arranged, at least one first screw hole 51 in the upper connecting member 100 corresponds to at least one second screw hole 52 in the lower connecting member 200 one to one and forms at least one connecting through hole, or/and at least one second screw hole 52 in the upper connecting member 100 corresponds to at least one first screw hole 51 in the lower connecting member 200 one to one and forms at least one connecting through hole; the number of the bolts 300 is at least one, and at least one of the bolts 300 is correspondingly penetrated through at least one of the connecting through holes one to one and is locked by nuts 400.
Preferably, the upper connecting piece 100 and the lower connecting piece 200 further include two vertical plates 4, the two vertical plates 4 are vertically fixed to two side faces of the gusset plate 3 relative to the gusset plate 3, and the two vertical plates 4 are further vertically fixed to the connecting plate 1 relative to the connecting plate 1.
Preferably, the vertical plate 4 is provided with a fixing hole 7.
Preferably, in the upper connecting member 100 and the lower connecting member 200, a rib plate 6 is fixed at a connection position of the connecting plate 1 and the gusset plate 3.
Preferably, four rib plates 6 are arranged, and the four rib plates 6 are perpendicular to the gusset plate 3 and are respectively fixed on two sides of the gusset plate 3 close to two ends; the four rib plates 6 are also vertically fixed on the connecting plate 1 relative to the connecting plate 1.
The rib plates 6 are used for reinforcing the connection strength between the connecting plate 1 and the gusset plates 3, so that the connection between the connecting plate 1 and the gusset plates 3 is firmer.
Preferably, the extension direction of the node plate 3 is the same as the extension direction of the connecting plate 1.
Railway bridge static test platform longeron is formed by the steel construction combination of a plurality of rice style of calligraphy, and in the steel construction of arbitrary rice style of calligraphy, the one end of four down tubes can be dismantled through the correspondence and connect in the both sides of two risers 4 and converge together to can dismantle with connecting plate 1 in the lower connecting piece 200 through connecting plate 1 in the last connecting piece 100 and link together, realize that the whole of four down tubes can dismantle in the steel construction of rice style of calligraphy and connect.
The longitudinal beams of the railway bridge static test bed are bilaterally symmetrical, and the right half of the longitudinal beam is taken for stress analysis, as shown in FIG. 13; the maximum load of each jack is 1500KN, the loading mode is considered according to the requirement of TB 2092-2003 'static load bending crack resistance test method for prestressed concrete railway bridge simple supported beams', the loading mode is two rows, the total number of the jacks is 14, and the total load is 21000 kN. Because each jack corresponds to two longitudinal beams, the maximum value of the jack F is 750kN by calculating with a single longitudinal beam. Through mechanics calculation, the stress condition of each inclined rod can be obtained, wherein the positive value is tensile force, the negative value is pressure, and the unit is KN.
Let O in FIG. 135Node and O4The stress of the node is put into the coordinate axis, as shown in FIG. 14, and is converted into O5The node has a vertical upward pull force 374.9KN and a horizontal leftward force 2245.2 KN; o is4The node has a vertical downward pressure 383.6KN and a horizontal leftward force 2297 KN.
Based on the mechanical requirements, the connecting mechanism of the invention is adopted:
in the vertical direction, 4M 24 bolts 300 of 8.8 levels are selected to connect the connecting plate 1 in the upper connecting member 100 with the connecting plate 1 in the lower connecting member 200. In GB/T3098.1-2000, 8.8 grade M24 bolts 300 guarantee a load of 212KN to 212000N. The 4 bolts 300 guarantee a load of 212X 4-848 KN, which is greater than FO5y, satisfies O5Connection requirements in the Y direction of the node. In addition, O4The stress of the Y direction of the node is pressure, the bolt only needs to play a role in up-and-down connection, and the 8.8-grade M24 bolt is selected to meet the connection requirement. O is1Node, O2Node and O3The forces in the Y direction of the node are all pressures, and the bolt 300 only plays a role in connection up and down. The bolt is connected in an up-and-down mode to form a better fixed connection mode, and other up-and-down connection modes can be adopted. Because only the node plates on the extreme edges of all the nodes are subjected to pulling force, the middle node plates are subjected to compression force, namely, the more stressed node plates are connected up and down, the tighter the node plates are. The node on the edge is not subjected to large tensile force, and two selected bolts can bear the tensile force.
Horizontal direction, from the force analysis of fig. 14: FO5x＝2245.2KN，FO4x＝2287KN，O1Node, O2Node and O3The horizontal force at the nodes is obviously reduced, and each node is horizontally forced to the left. Two top plates 2 are respectively arranged on the upper connecting piece 100 and the lower connecting piece 200, and when the top plate is assembled, the right end surface of the top plate 2 on the lower connecting piece 100 is tightly attached to the left end surface of the top plate 2 on the upper connecting piece 200. The top plate 2 in the upper and lower connecting pieces is a steel plate with the width of 200mm and the thickness of 25mm and the label of Q345. Due to O4The stress of the node in the horizontal direction is maximum, and the stress of the top plate 2 on the node is calculated:
the end surface area S of one top plate 2 is 200X25＝5000mm2＝5X10-3m2Each top plate 2 is stressed by a stress of σ ═ FNA, wherein FN＝FO4x＝2287KN＝2287X103N，A＝2S＝10X10-3m2,So σ is 228.7X106N/m2228.7MPa, less than allowable stress of material.
O1Node and O2The horizontal direction stress at the node is as follows:
FO1x＝493.5cos(49.46)＝320.8KN，
FO2X＝(493.5+986.9)cos(49.46)＝962.2KN；
therefore O1Node and O2Only one top plate 2 is arranged on each of the connecting plates 1 of the upper connecting member 100 and the lower connecting member 200 at the node, as shown in fig. 12.
The connecting mechanism for the longitudinal beam of the railway bridge static test bed adopts two connecting pieces, two parts needing to be movably connected are respectively fixed on the two connecting pieces, and movable connection can be realized through bolts. Holes are arranged at the corresponding positions of the upper connecting piece 100 and the lower connecting piece 200, so that the upper connecting piece and the lower connecting piece can be vertically connected and fixed through bolts 300 and matched nuts 400, and the movement in the vertical direction can be avoided; in addition, the end surfaces of the top plates 2 which are welded on the connecting plates 1 of the upper connecting piece 100 and the lower connecting piece 200 are mutually propped against each other along the horizontal direction, so that the movement in the horizontal direction can be avoided, and the requirement of the loading force of a static load test can be met; the top plates 2 on the upper connecting piece 100 and the lower connecting piece 200 are arranged side by side in a staggered mode, so that the upper connecting plate 100 and the lower connecting plate 200 can be conveniently embedded and installed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a coupling mechanism of railway bridge static test bench longeron which characterized in that: the connecting mechanism comprises an upper connecting piece (100) and a lower connecting piece (200); the upper connecting piece (100) and the lower connecting piece (200) respectively comprise a connecting plate (1), a top plate (2) and a node plate (3), the node plate (3) is vertically welded on one surface of the connecting plate (1), at least one top plate (2) is arranged, and at least one top plate (2) is welded on the other surface of the connecting plate (1) in an attaching manner; the upper connecting piece (100) and the lower connecting piece (200) are arranged oppositely up and down and are vertically connected and fixed through a bolt (300) and a matched nut (400); the top plates (2) on the upper connecting piece (100) and the lower connecting piece (200) are horizontally and alternately arranged side by side to form at least one group of top plate groups, each group of top plate group consists of one top plate (2) on the upper connecting piece (200) and one top plate (2) on the lower connecting piece (200), and in each group of top plate groups, the end surfaces of the top plates (2) of the upper connecting piece (100) and the lower connecting piece (200) are oppositely jacked in the horizontal direction; relative to the center of the longitudinal beam, the top plate (2) of the upper connecting plate (100) is located on the outer side, and the top plate (2) of the lower connecting plate (200) is located on the inner side.
2. The connecting mechanism for the longitudinal beams of the railway bridge static test bed according to claim 1, is characterized in that: at least one screw hole is formed in each of the connecting plates (1) of the upper connecting piece (100) and the lower connecting piece (200), and a bolt (300) penetrating through the screw hole and a nut (400) matched with the bolt (300) are arranged on each of the upper connecting piece (100) and the lower connecting piece (200); when the upper connecting piece (100) and the lower connecting piece (200) are arranged oppositely, the screw hole on the connecting plate (1) of the upper connecting piece (100) and the screw hole on the connecting plate (1) of the lower connecting piece (200) are opposite to form a connecting through hole; the bolt (300) penetrates through the connecting through hole and is locked by the nut (400).
3. The connecting mechanism for the longitudinal beams of the railway bridge static test bed, according to claim 2, is characterized in that: in the upper connecting piece (100), the screw holes comprise a first screw hole (51) or/and a second screw hole (52); at least one first screw hole (51) penetrating through the connecting plate (1) is arranged at a position of the connecting plate (1) avoiding the top plate (2), or/and at least one second screw hole (52) penetrating through the connecting plate (1) and the top plate (2) is arranged at a position of the connecting plate (1) overlapping with the top plate (2); the structure of the lower connecting piece (200) is the same as that of the upper connecting piece (100), when the upper connecting piece (100) and the lower connecting piece (200) are oppositely arranged, at least one first screw hole (51) in the upper connecting piece (100) and at least one second screw hole (52) in the lower connecting piece (200) are in one-to-one correspondence and form at least one connecting through hole, or/and at least one second screw hole (52) in the upper connecting piece (100) and at least one first screw hole (51) in the lower connecting piece (200) are in one-to-one correspondence and form at least one connecting through hole; the bolts (300) are provided with at least one, and the at least one bolt (300) correspondingly penetrates through the at least one connecting through hole in a one-to-one mode and is locked through nuts (400).
4. The connecting mechanism for the longitudinal beams of the railway bridge static test bed according to any one of claims 1 to 3, wherein: go up connecting piece (100) with still all include two riser (4) on lower connecting piece (200), two riser (4) are relative gusset plate (3) vertically is fixed on the both sides face of gusset plate (3), and two riser (4) are still relative connecting plate (1) vertically is fixed on connecting plate (1).
5. The connecting mechanism for the longitudinal beams of the railway bridge static test bed, according to claim 4, is characterized in that: and the vertical plate (4) is provided with a fixing hole (7).
6. The connecting mechanism for the longitudinal beams of the railway bridge static test bed according to any one of claims 1 to 3, wherein: in the upper connecting piece (100) and the lower connecting piece (200), a rib plate (6) is fixed at the joint of the connecting plate (1) and the gusset plate (3).
7. The connecting mechanism for the longitudinal beams of the railway bridge static test bed, according to claim 6, is characterized in that: the four rib plates (6) are perpendicular to the gusset plate (3) and are respectively fixed on two sides of the gusset plate (3) close to two ends; the four rib plates (6) are also vertically fixed on the connecting plate (1) relative to the connecting plate (1).
8. The connecting mechanism for the longitudinal beams of the railway bridge static test bed according to any one of claims 1 to 3, wherein: the extending direction of the node plate (3) is the same as that of the connecting plate (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011229099.4A CN112326292A (en) | 2020-11-06 | 2020-11-06 | Connecting mechanism for longitudinal beam of railway bridge static load test bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011229099.4A CN112326292A (en) | 2020-11-06 | 2020-11-06 | Connecting mechanism for longitudinal beam of railway bridge static load test bed |
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| Publication Number | Publication Date |
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| CN112326292A true CN112326292A (en) | 2021-02-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011229099.4A Pending CN112326292A (en) | 2020-11-06 | 2020-11-06 | Connecting mechanism for longitudinal beam of railway bridge static load test bed |
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| CN (1) | CN112326292A (en) |
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2020
- 2020-11-06 CN CN202011229099.4A patent/CN112326292A/en active Pending
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