CN113818331A - Large-span pipeline truss beam falling prevention device - Google Patents
Large-span pipeline truss beam falling prevention device Download PDFInfo
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- CN113818331A CN113818331A CN202111268972.5A CN202111268972A CN113818331A CN 113818331 A CN113818331 A CN 113818331A CN 202111268972 A CN202111268972 A CN 202111268972A CN 113818331 A CN113818331 A CN 113818331A
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- transverse shaft
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- 230000002265 prevention Effects 0.000 title claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- 230000001788 irregular Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 2
- 210000003781 tooth socket Anatomy 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention belongs to the technical field of pipeline trusses, and particularly relates to a long-span pipeline truss beam falling prevention device. The pre-tightening device is internally provided with a ratchet mechanism, the ratchet is fixed on the main transverse shaft and used for limiting the rotation direction of the main transverse shaft, the limiting mechanism is arranged in the limiting device and comprises a clamping wheel, a hollowed cam is arranged in the inner ring of the clamping wheel, one end of a 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 formed in 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, well limit the pipeline truss 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 large-span pipeline truss girder falling prevention device.
Background
The earthquake or violent vibration can cause beam falling accidents, and the beam falling prevention devices in the field of traffic bridges at the current stage are more and are less and suitable for pipeline trusses, particularly large-span pipeline trusses. The corner can take place for the large-span pipeline truss because beam-ends member piece under the loading effect, consequently adopts rubber support more at present in order to adapt to roof beam body corner, nevertheless adopts rubber support, and the roof beam that falls takes place for earthquake or violent vibrations change, consequently needs one kind to carry out the large displacement restriction to the large-span pipeline truss under the accidental action, prevents the device of roof beam that falls.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide a large-span pipeline truss girder falling prevention device.
The invention is realized by the following technical scheme:
a girder falling prevention device for 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, the clamping wheel is provided with inner teeth, 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 located in a space surrounded by the inner teeth of the clamping wheel, the middle of the cam is an irregular hollow part, one end of the cam with large mass is provided with a tooth socket, and the tooth socket can clamp the inner 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 shell surfaces of the shell A and the shell B; the pre-tightening device and the limiting device are fixed on the cover beam below the pipeline truss, a steel strand is wound on a main cross shaft between the pre-tightening device and the limiting device, one end of the steel strand is fixed on the main cross 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 both convex blocks integrated with the main transverse shaft.
Preferably, the other end of the steel strand is fixed on the pipeline truss through an embedded steel plate.
The device can limit the horizontal sliding of the pipeline truss, well limit the pipeline truss and effectively prevent the occurrence of beam falling accidents.
Drawings
FIG. 1 is a schematic view showing the structure of the apparatus of the present invention in use.
Fig. 2 is a schematic view of the whole structure of the pretensioning device and the limiting device of the invention.
Fig. 3 is a general elevation view of the pretensioning device and the spacing device of the present invention.
Fig. 4 is a schematic cross-sectional structure of the pretensioning device according to the invention.
Fig. 5 is a schematic sectional structure view of the limiting device of the present invention.
In the figure, 1 a pre-tightening device, 2 a limiting device, 3 a main transverse shaft, 4 a shell A, 5 ratchets, 6 pawls, 7 return springs, 8 a shell B, 9 clamping wheels, 10 internal teeth, 11 connecting rods, 12 cams, 13 tooth grooves, 14 a limiting blocks, 15 a limiting block B, 16 capping beams, 17 pipeline trusses and 19 steel strands.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
Referring to fig. 1-5, the invention includes a pre-tightening device 1 and a limiting device 2, the pre-tightening device 1 includes a housing a4, the limiting device 2 includes a housing B8, a pre-tightening mechanism is disposed in the housing a4, and a limiting mechanism is disposed in the housing B8. In this embodiment, it is preferable that the outer shell a4 and the outer shell B8 are both regular hexagonal outer shells, a round hole is formed in the center of any regular hexagonal surface of the outer shell a4, similarly, a round hole identical to the outer shell a4 is also formed in the center of any regular hexagonal surface of the outer shell B8, the outer shell a4 and the outer shell B8 are placed in parallel, two surfaces with the round hole are placed oppositely, two ends of a main transverse shaft 3 penetrate through the round holes on two sides respectively 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 cross shaft 3 from sliding in the horizontal direction when rotating, a limit block A14 and a limit block B15 are respectively arranged on the main cross shaft 3, a limit block A14 is arranged outside a regular hexagonal surface of a round hole arranged on a shell A4, a limit block A14 is tightly attached to the outer surface of the regular hexagonal surface of a shell A4, a limit block B15 is arranged outside the regular hexagonal surface of the round hole arranged on a shell B8, and a limit block B15 is tightly attached to the outer surface of the regular hexagonal surface of a shell B8. The preferred stopper A14 and stopper B15 of this embodiment are both protruding blocks integrated with the main horizontal shaft 3, that is, the diameter of the main horizontal shaft 3 is suddenly increased on the outer surface close to the regular hexagonal surface, so that the main horizontal shaft 3 is limited and will not slide horizontally between the circular holes of the outer shell A4 and the outer shell B8 during rotation.
The 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 the embedded steel plate of the pipeline truss 17. Both the pre-tightening device 1 and the limiting device 2 are fixed on the cover beam 16 below the pipeline 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 the main horizontal shaft 3, the pawl 6 is positioned right below the ratchet wheel 5, a 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 a 4. Reset spring 7 one end is fixed on shell A4 casing, and the other end is fixed in the middle part of pawl 6, and reset spring 7 is used for the position of pawl 6 that resets, prevents that the claw end of pawl 6 from dropping downwards, and reset spring 7 is the level setting. In this embodiment, when the main horizontal shaft 3 rotates counterclockwise, the ratchet 5 will also rotate counterclockwise, and the pawl 6 will not block the counterclockwise rotation of the ratchet 5, but the pawl 6 will block the clockwise rotation of the ratchet 5, so that the ratchet 5 will not rotate clockwise. Ratchet mechanisms are well known mechanical components and the principle is not described here too much.
As shown in fig. 5, the position limiter 2 includes a housing B8, a click wheel 9 is fixed on the housing inside the housing B8, and the click wheel 9 is provided with internal teeth 10. A link 11 is centrally fixed to the end face of the main transverse shaft 3 extending into the interior of the housing B8, the link 11 being perpendicular to the main transverse shaft 3. A cam 12 is arranged in a space surrounded by 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 link, i.e., the link strength, is small, and the cam 12 is separated from the link 11 due to centrifugal force when the cam 12 is suddenly subjected to a large force. The preferred weak connection mode of this embodiment is magnetic connection, and a magnet piece 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 adsorbed together through the magnet piece.
The middle part of the cam 12 is an irregular hollow part, and in the attached figure 5, the cam 12 is a hollow part around the main transverse shaft 3. One end of the cam 12 with large mass is provided with a tooth groove 13, the tooth groove 13 is matched with the inner teeth 10 of the clamping wheel 9, and the tooth groove 13 can clamp the inner teeth 10 when the cam 12 is thrown out.
The device is arranged on the lower bent cap 16 at the left end and the right end of the pipeline truss 17, and the attached figure 1 is a schematic diagram of the device arranged on the left bent cap 16. The pre-tightening device 1 and the limiting device 2 are both fixed on the bent cap 16, the main transverse shaft 3 is wound with a steel strand 19, and the other end of the steel strand 19 is fixedly connected with an embedded steel plate of the pipeline truss 17. If the steel strand 19 is not in a tightened 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 slowly rotates anticlockwise, the ratchet wheel 5 of the pre-tightening device 1 also rotates anticlockwise, the steel strand 19 is slowly wound on the main transverse shaft 3 until the steel strand 19 is in the tightened state, at this time, the main transverse shaft 3 stops rotating, and due to the existence of the pawl 6, the ratchet wheel 5 cannot rotate clockwise, so that the steel strand 19 cannot retract and is always in the tightened state. Meanwhile, when the main transverse shaft 3 rotates anticlockwise slowly, the connecting rod 11 in the limiting device 2 can be driven to rotate slowly, the connecting rod 11 drives the cam 12 to rotate slowly in a space surrounded by the inner teeth 10 of the clamping wheel 9, and the tooth grooves 13 of the cam 12 cannot touch the inner teeth 10 of the clamping wheel 9.
When the pipeline truss 17 slides horizontally on the cover beam 16 in a large displacement manner due to an earthquake or violent vibration, if the pipeline truss 17 slides horizontally in a right direction, the left steel strand 19 slides rightwards, the steel strand 19 pulls the main transverse shaft 3 to rotate clockwise, the force is large, the pawl 6 is damaged preferentially because the pawl 6 has low strength, the main transverse shaft 3 rotates clockwise rapidly suddenly, the rapidly rotating main transverse shaft 3 drives the connecting rod 11 in the limiting device 2 to rotate rapidly, the connecting rod 11 is separated from one end of the cam 12 in weak connection due to centrifugal force, the cam 12 is thrown out, after the cam 12 is thrown out, the internal teeth 10 of the clamping wheel 9 are clamped by the tooth grooves 13 of the cam 12, so that the connected main transverse shafts 3 cannot rotate any more, emergency braking is realized, the steel strand 19 has a tensile force on the pipeline truss 17, and the purpose of limiting the large-displacement horizontal sliding of the pipeline truss 17 is achieved, the inventive device on the other side limits the horizontal sliding of the pipe truss 17 to the left.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; those of ordinary skill in the art will understand that: the technical solutions described in the above embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. The utility model provides a girder installation is prevented falling by 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 inside 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 inside the shell A (4), one end of the return spring (7) is fixed inside 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 inside 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 of the cam (12) is an irregular hollow part, a tooth groove (13) is arranged at one end of the cam (12) with large mass, and the tooth groove (13) can clamp the internal teeth (10) when the cam (12) is thrown out; 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 shell surfaces of the shell A (4) and the shell B (8); the pre-tightening device (1) and the limiting device (2) are fixed on a cover beam (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 girder dropping prevention device according to claim 1, wherein: the weak connection is a magnetic connection.
3. The large-span pipe truss girder dropping prevention device according to claim 1, wherein: and the shell A (4) and the shell B (8) are both regular hexagon shells.
4. The large-span pipe truss girder dropping prevention device according to claim 1, wherein: the limiting block A (14) and the limiting block B (15) are both protruding blocks integrated with the main transverse shaft (3).
5. The large-span pipe truss girder dropping prevention device according to claim 1, wherein: the other end of the steel strand (19) is fixed on the pipeline truss (17) through an embedded 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 |
|---|---|
| CN113818331A true CN113818331A (en) | 2021-12-21 |
| CN113818331B 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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| CN113818331B (en) | 2023-06-02 |
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