CN113818331B - Beam falling prevention device for large-span pipeline truss - Google Patents
Beam falling prevention device for large-span pipeline truss Download PDFInfo
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- CN113818331B CN113818331B CN202111268972.5A CN202111268972A CN113818331B CN 113818331 B CN113818331 B CN 113818331B CN 202111268972 A CN202111268972 A CN 202111268972A CN 113818331 B CN113818331 B CN 113818331B
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- transverse shaft
- main transverse
- cam
- shell
- fixed
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
Abstract
The invention belongs to the technical field of pipeline trusses, and particularly relates to a large-span pipeline truss girder falling prevention device. The device comprises a main transverse shaft, a pre-tightening device, a ratchet mechanism, a limiting device and a connecting rod, wherein the ratchet mechanism is arranged in the pre-tightening device and is fixed on the main transverse shaft and used for limiting the rotation direction of the main transverse shaft, the limiting device is internally provided with the limiting mechanism and comprises a clamping wheel, a hollowed cam is arranged in the inner ring of the clamping wheel, one end of the connecting rod is strongly connected with the cam, the other end of the connecting rod is weakly connected with the cam, the center of the connecting rod is fixed on the main transverse shaft, a tooth groove is arranged on the cam, and when the cam is thrown out due to centrifugal force, the tooth groove clamps the clamping wheel, so that the main transverse shaft cannot rotate. The device can limit the horizontal sliding of the pipeline truss, limit the pipeline truss well and effectively prevent the occurrence of beam falling accidents.
Description
Technical Field
The invention belongs to the technical field of pipeline trusses, and particularly relates to a girder falling prevention device for a long-span pipeline truss.
Background
The earthquake or severe vibration can cause beam falling accidents, the beam falling prevention devices in the field of traffic bridges at the present stage are more, and the beam falling prevention devices suitable for pipeline trusses, especially large-span pipeline trusses, are fewer. The large-span pipeline truss can turn under the action of load, so that the rubber support is adopted at present to adapt to the turning angle of the girder body, but the girder is easy to fall off due to earthquake or severe vibration, and therefore, a device for limiting large displacement and preventing the girder from falling off is required under the accidental action.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide a girder falling prevention device for a long-span pipeline truss.
The invention is realized by the following technical scheme:
a girder falling prevention device of a large-span pipeline truss comprises a pre-tightening device and a limiting device, wherein round holes are formed in the centers of the pre-tightening device and the limiting device, a main transverse shaft penetrates into the round holes of the pre-tightening device and the limiting device to connect the pre-tightening device and the limiting device together, the diameter of the main transverse shaft is equal to that of the round holes, and the main transverse shaft rotates in the round holes; the pre-tightening device comprises a shell A, a ratchet mechanism is arranged in the shell A and comprises a ratchet wheel, a pawl and a return spring, wherein the ratchet wheel is fixed on a main transverse shaft, the pawl is fixed in the shell A, one end of the return spring is fixed on the inner wall of the shell A, and the other end of the return spring is fixed in the middle of the pawl; the limiting device comprises a shell B, a clamping wheel is fixed in the shell B, internal teeth are arranged on the clamping wheel, the center of a connecting rod is fixed on the end face of a main transverse shaft extending into the shell B, the connecting rod is perpendicular to the main transverse shaft, one end of the connecting rod is fixedly connected to a cam, the other end of the connecting rod is weakly connected with the cam, the cam is positioned in a space surrounded by the internal teeth of the clamping wheel, the middle part of the cam is an irregular hollowed-out part, a tooth groove is formed in one end of the cam with large mass, and the tooth groove can clamp the internal teeth when the cam is thrown out; the main transverse shaft is provided with a limiting block A and a limiting block B, and the limiting block A and the limiting block B are respectively positioned on the outer shell surfaces of the outer shell A and the outer shell B; the pre-tightening device and the limiting device are both fixed on the bent cap below the pipeline truss, a steel strand is wound on a main transverse shaft between the pre-tightening device and the limiting device, one end of the steel strand is fixed on the main transverse shaft, and the other end of the steel strand is fixed on the pipeline truss.
Preferably, the weak connection is a magnetic connection.
Preferably, the shell a and the shell B are both regular hexagonal shells.
Preferably, the limiting block A and the limiting block B are protruding blocks integrated with the main transverse shaft.
Preferably, the other end of the steel strand is fixed on the pipeline truss through a pre-buried steel plate.
The device can limit the horizontal sliding of the pipeline truss, limit the pipeline truss well and effectively prevent the occurrence of beam falling accidents.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present invention in use.
FIG. 2 is a schematic view of the overall structure of the pretensioning device and the limiting device of the present invention.
Fig. 3 is an overall elevation view of the pretensioning device and the spacing device of the present invention.
FIG. 4 is a schematic cross-sectional view of the pretensioning apparatus of the present invention.
Fig. 5 is a schematic cross-sectional view of a limiting device according to the present invention.
In the figure, a pre-tightening device 1, a limiting device 2, a main transverse shaft 3, a shell A4, a ratchet wheel 5, a pawl 6, a return spring 7, a shell B8, a clamping wheel 9, internal teeth 10, a connecting rod 11, a cam 12, tooth grooves 13, a limiting block A14, a limiting block B15, a cover beam 16, a pipeline truss 17 and a steel strand 19.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.
Referring to fig. 1-5, the invention comprises a pretensioning device 1 and a limiting device 2, wherein the pretensioning device 1 comprises a housing A4, the limiting device 2 comprises a housing B8, a pretensioning mechanism is arranged in the housing A4, and a limiting mechanism is arranged in the housing B8. In this embodiment, the casing A4 and the casing B8 are preferably regular hexagonal casings, a round hole is formed in the center of any regular hexagonal surface of the casing A4, a round hole identical to the round hole of the casing A4 is also formed in the center of any regular hexagonal surface of the casing B8, the casing A4 and the casing B8 are placed in parallel, two sides with the round hole are placed opposite to each other, two ends of a main transverse shaft 3 respectively penetrate through the round holes on two sides and extend into the pre-tightening device 1 and the limiting device 2, the diameter of the main transverse shaft 3 is equal to that of the round hole, and the main transverse shaft 3 can rotate in the round hole. In order to prevent the main transverse shaft 3 from sliding in the horizontal direction when rotating, a limiting block A14 and a limiting block B15 are respectively arranged on the main transverse shaft 3, the limiting block A14 is arranged outside a regular hexagonal surface of the shell A4, which is provided with a round hole, the limiting block A14 is tightly attached to the outer surface of the regular hexagonal surface of the shell A4, the limiting block B15 is arranged outside a regular hexagonal surface of the shell B8, which is provided with a round hole, and the limiting block B15 is tightly attached to the outer surface of the regular hexagonal surface of the shell B8. In this embodiment, the preferable limiting blocks a14 and B15 are protruding blocks integrated with the main transverse shaft 3, that is, the main transverse shaft 3 has a section of diameter suddenly enlarged on the outer surface close to the regular hexagonal surface, so that the main transverse shaft 3 is limited, and does not slide horizontally between the round holes of the housing A4 and the housing B8 during rotation.
A steel strand 19 is wound on the main transverse shaft 3 between the pre-tightening device 1 and the limiting device 2, one end of the steel strand 19 is fixed on the main transverse shaft 3 between the pre-tightening device 1 and the limiting device 2, the other end of the steel strand 19 is fixed on the pipeline truss 17, and preferably, the other end of the steel strand 19 is fixedly connected with a pre-buried steel plate of the pipeline truss 17. The pretensioning device 1 and the limiting device 2 are both fixed on the bent cap 16 below the pipe truss 17.
The pretensioning device 1 and the limiting device 2 are described in detail below:
as shown in fig. 4, the pretensioning device 1 is provided with a pretensioning mechanism in a housing A4, the pretensioning mechanism is a ratchet mechanism, the ratchet mechanism comprises a ratchet wheel 5, a pawl 6 and a return spring 7, wherein the ratchet wheel 5 is fixed on a main transverse shaft 3, the pawl 6 is positioned under the ratchet wheel 5, the claw end of the pawl 6 is inserted into the ratchet wheel 5, and the pawl 6 is matched with the ratchet wheel 5. The pawl 6 is fixed to the housing of the housing A4. One end of a reset spring 7 is fixed on the shell A4, the other end of the reset spring is fixed in the middle of the pawl 6, the reset spring 7 is used for resetting the position of the pawl 6 and preventing the claw end of the pawl 6 from falling downwards, and the reset spring 7 is horizontally arranged. In this embodiment, when the main transverse shaft 3 rotates counterclockwise, the ratchet wheel 5 rotates counterclockwise, the pawl 6 does not prevent the ratchet wheel 5 from rotating counterclockwise, but the pawl 6 prevents the ratchet wheel 5 from rotating clockwise, so that the ratchet wheel 5 does not rotate clockwise. The ratchet mechanism is a well known mechanical component, the principle of which is not described here too much.
As shown in fig. 5, the limiting device 2 comprises a housing B8, a clamping wheel 9 is fixed on a shell inside the housing B8, and the clamping wheel 9 is provided with internal teeth 10. The center of a connecting rod 11 is fixed on the end face of the main transverse shaft 3 extending into the shell B8, and the connecting rod 11 is perpendicular to the main transverse shaft 3. A cam 12 is arranged in a space surrounded by the inner teeth 10 of the clamping wheel 9, the cam 12 is a steel disc with an irregular shape, one end of a connecting rod 11 is fixedly connected to the cam 12 through a bolt, and the other end of the connecting rod 11 is weakly connected with the cam 12. The weak connection, i.e., the connection strength, is small, and when the cam 12 is suddenly subjected to a large force, the cam 12 is separated from the link 11 due to centrifugal force. The preferred weak connection mode of this embodiment is magnetic attraction connection, and a magnet sheet is arranged at the other end of the cam 12 or the connecting rod 11, and the cam 12 and the connecting rod 11 are attracted together through the magnet sheet.
The middle part of the cam 12 is an irregular hollowed-out part, and in fig. 5, the circumference of the cam 12 around the main transverse shaft 3 is a hollowed-out part. The end of the cam 12 with large mass is provided with tooth grooves 13, the tooth grooves 13 are matched with the inner teeth 10 of the clamping wheel 9, and when the cam 12 is thrown out, the tooth grooves 13 can clamp the inner teeth 10.
A set of the device of the present invention is installed on the lower cap beams 16 at the left and right ends of the pipe truss 17, and fig. 1 is a schematic view of the installation of the device of the present invention on the left cap beam 16. The pre-tightening device 1 and the limiting device 2 are both fixed on the bent cap 16, the steel stranded wires 19 are wound on the main transverse shaft 3, and the other ends of the steel stranded wires 19 are fixedly connected with the pre-embedded steel plates of the pipeline truss 17. If the steel strand 19 is not in a tightening state, the main transverse shaft 3 between the pre-tightening device 1 and the limiting device 2 is slowly rotated anticlockwise, the main transverse shaft 3 is slowly rotated anticlockwise, the ratchet wheel 5 of the pre-tightening device 1 is also slowly rotated anticlockwise, the steel strand 19 is slowly wound on the main transverse shaft 3 until the steel strand 19 is in a tightening state, at the moment, the rotation of the main transverse shaft 3 is stopped, the ratchet wheel 5 is not rotated clockwise due to the pawl 6, and therefore the steel strand 19 is not retracted and is always in the tightening state. Meanwhile, when the main transverse shaft 3 rotates anticlockwise slowly, the connecting rod 11 in the limiting device 2 is driven to rotate slowly, the connecting rod 11 drives the cam 12 to rotate slowly in the space surrounded by the internal teeth 10 of the clamping wheel 9, and the tooth grooves 13 of the cam 12 cannot touch the internal teeth 10 of the clamping wheel 9.
When the pipe truss 17 slides horizontally on the capping beam 16 in a large displacement manner due to earthquake or severe vibration, if the pipe truss 17 slides horizontally to the right, the steel stranded wires 19 on the left side are carried to slide horizontally, the steel stranded wires 19 pull the main transverse shaft 3 to rotate clockwise, the force is large, the pawl 6 is damaged due to lower strength, the main transverse shaft 3 rotates rapidly and suddenly, the main transverse shaft 3 rotates rapidly, the connecting rod 11 in the limiting device 2 rotates rapidly due to the rapid rotation of the main transverse shaft 3, the connecting rod 11 is separated from one end, which is weakly connected with the cam 12, the cam 12 is thrown out, after the cam 12 is thrown out, the tooth grooves 13 of the cam 12 clamp the inner teeth 10 of the clamping wheel 9, so that the main transverse shaft 3 connected together cannot rotate any more, emergency braking is realized, the steel stranded wires 19 have a tensile force on the pipe truss 17, and therefore the aim of limiting the large displacement horizontal sliding of the pipe truss 17 is achieved, and the device of the invention limits the horizontal sliding of the pipe truss 17 to the left side is limited.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; those of ordinary skill in the art will appreciate that: the technical scheme described in the above embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The utility model provides a roof beam device falls in large-span pipeline truss which characterized in that: the device comprises a pre-tightening device (1) and a limiting device (2), wherein round holes are formed in the centers of the pre-tightening device (1) and the limiting device (2), a main transverse shaft (3) penetrates into the round holes of the pre-tightening device (1) and the limiting device (2) to connect the pre-tightening device (1) and the limiting device (2) together, the diameter of the main transverse shaft (3) is equal to that of the round holes, and the main transverse shaft (3) rotates in the round holes; the pre-tightening device (1) comprises a shell A (4), a ratchet mechanism is arranged in the shell A (4), the ratchet mechanism comprises a ratchet wheel (5), a pawl (6) and a return spring (7), the ratchet wheel (5) is fixed on a main transverse shaft (3), the pawl (6) is fixed in the shell A (4), one end of the return spring (7) is fixed in the shell A (4), and the other end of the return spring is fixed in the middle of the pawl (6); the limiting device (2) comprises a shell B (8), a clamping wheel (9) is fixed in the shell B (8), internal teeth (10) are arranged on the clamping wheel (9), the center of a connecting rod (11) is fixed on the end face of a main transverse shaft (3) extending into the shell B (8), the connecting rod (11) is perpendicular to the main transverse shaft (3), one end of the connecting rod (11) is fixedly connected to a cam (12), the other end of the connecting rod (11) is weakly connected with the cam (12), the cam (12) is located in a space surrounded by the internal teeth (10) of the clamping wheel (9), the middle part of the cam (12) is an irregular hollowed-out part, one end of the cam (12) with large mass is provided with tooth grooves (13), and when the cam (12) is thrown out, the tooth grooves (13) can be clamped with the internal teeth (10); the main transverse shaft (3) is provided with a limiting block A (14) and a limiting block B (15), and the limiting block A (14) and the limiting block B (15) are respectively positioned on the outer shell surfaces of the outer shell A (4) and the outer shell B (8); the pre-tightening device (1) and the limiting device (2) are both fixed on a bent cap (16) below the pipeline truss (17), a steel strand (19) is wound on a main transverse shaft (3) between the pre-tightening device (1) and the limiting device (2), one end of the steel strand (19) is fixed on the main transverse shaft (3), and the other end of the steel strand (19) is fixed on the pipeline truss (17).
2. The large span pipe truss anti-drop beam device of claim 1, wherein: the weak connection is magnetic connection.
3. The large span pipe truss anti-drop beam device of claim 1, wherein: the shell A (4) and the shell B (8) are regular hexagon shells.
4. The large span pipe truss anti-drop beam device of claim 1, wherein: the limiting block A (14) and the limiting block B (15) are protruding blocks which are integrated with the main transverse shaft (3).
5. The large span pipe truss anti-drop beam device of claim 1, wherein: the other end of the steel strand (19) is fixed on the pipeline truss (17) through a pre-buried steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111268972.5A CN113818331B (en) | 2021-10-29 | 2021-10-29 | Beam falling prevention device for large-span pipeline truss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111268972.5A CN113818331B (en) | 2021-10-29 | 2021-10-29 | Beam falling prevention device for large-span pipeline truss |
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| Publication Number | Publication Date |
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| CN113818331A CN113818331A (en) | 2021-12-21 |
| CN113818331B true CN113818331B (en) | 2023-06-02 |
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| CN202111268972.5A Active CN113818331B (en) | 2021-10-29 | 2021-10-29 | Beam falling prevention device for large-span pipeline truss |
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