CN113737653A - Prepressing device of bearing support and using method thereof - Google Patents
Prepressing device of bearing support and using method thereof Download PDFInfo
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- CN113737653A CN113737653A CN202110919703.4A CN202110919703A CN113737653A CN 113737653 A CN113737653 A CN 113737653A CN 202110919703 A CN202110919703 A CN 202110919703A CN 113737653 A CN113737653 A CN 113737653A
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- bearing support
- force transmission
- pull
- jack
- transmission structure
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- 238000000034 method Methods 0.000 title abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 39
- 238000005056 compaction Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 10
- 230000002441 reversible effect Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010959 steel Substances 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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention discloses a prepressing device of a bearing support and a using method thereof, the prepressing device comprises an upper pull beam, a lower pull beam, an upper inhaul cable, a lower inhaul cable and a force application device, the upper pull beam is used for abutting against the top of the bearing support, the lower pull beam is used for abutting against the bottom of the bearing support, the force application device comprises an upper force transmission structure, a lower force transmission structure and a jack, two ends of the upper inhaul cable are respectively connected with the upper pull beam and the lower force transmission structure, two ends of the lower inhaul cable are respectively connected with the lower pull beam and the upper force transmission structure, two ends of the jack are respectively connected with the upper force transmission structure and the lower force transmission structure, the jack is in a hand-operated type, and the ground clearance of the jack is 0.8-1.5 m. The lower stay cable is anchored on the ground without using special equipment, so that the construction cost is reduced; and the jack is arranged at the position with the height of 0.8 to 1.5 meters from the ground, so that the operation is convenient for a user and the operation is safe. The invention relates to the technical field of bridge and aqueduct construction engineering.
Description
Technical Field
The invention relates to a prepressing device of a bearing support and a using method thereof in the technical field of bridge and aqueduct construction engineering.
Background
Before the construction of cast-in-place concrete beam plate structures such as large bridges and aqueducts, a bearing support is often required to be installed firstly, and the bearing support needs to be pre-pressed in order to eliminate the plastic deformation of the bearing support so as to ensure the safety and the quality of the structure construction. Among them, the reverse drawing method is one of the commonly used prepressing methods. The reverse pulling method adopts a rope reverse pulling mode, one end of the rope is anchored on the ground, the other end of the rope is connected with the bearing support, the rope is tensioned through a hydraulic jack, however, the reverse pulling method needs specific tensioning instruments and equipment, the requirement on the quality of operators is high, special operation training needs to be carried out, and the construction danger is large when the operators work at high altitude.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provides a prepressing device of a load-bearing support and a using method thereof.
According to the embodiment of the first aspect of the invention, the prepressing device of the bearing support comprises an upper pull beam, a lower pull beam, an upper pulling rope, a lower pulling rope and a force application device, wherein the upper pull beam is used for abutting against the top of the bearing support, the lower pull beam is used for abutting against the bottom of the bearing support, the force application device comprises an upper force transmission structure, a lower force transmission structure and a jack, two ends of the upper pulling rope are respectively connected to the upper pull beam and the lower force transmission structure, two ends of the lower pulling rope are respectively connected to the lower pull beam and the upper force transmission structure, two ends of the jack are respectively connected to the upper force transmission structure and the lower force transmission structure, the jack is in a hand-operated type, and the ground clearance of the jack ranges from 0.8 m to 1.5 m.
According to an embodiment of the first aspect of the present invention, further, the upper pulling rope is connected to a middle portion of the upper pulling beam, and the lower pulling rope is connected to a middle portion of the lower pulling beam.
According to the embodiment of the first aspect of the present invention, further, the pre-pressing device of the load-bearing support further includes a top pressure-bearing object and a bottom pressure-bearing object, the top pressure-bearing object is used for being attached to the top of the load-bearing support, the upper tie beam is connected to the top pressure-bearing object, the bottom pressure-bearing object is used for being attached to the bottom of the load-bearing support, and the lower tie beam is connected to the bottom pressure-bearing object.
According to the embodiment of the first aspect of the present invention, further, the number of the upper cables and the number of the lower cables are both more than two.
According to the embodiment of the first aspect of the present invention, further, the upper force transmission structure includes an upper connection plate, two upper cross beams, and an upper pulling plate, the upper connection plate is connected to the lower cable, two ends of the upper connection plate are respectively connected to the two upper cross beams, two ends of the upper pulling plate are respectively connected to the two upper cross beams, and the upper pulling plate is connected to the first end of the jack.
According to an embodiment of the first aspect of the present invention, the lower force transmission structure further includes a lower connection plate, two lower cross beams, and a lower pulling plate, the lower connection plate is connected to the upper cable, two ends of the lower connection plate are respectively connected to the two lower cross beams, two ends of the lower pulling plate are respectively connected to the two lower cross beams, and the lower pulling plate is connected to the second end of the jack.
According to an embodiment of the first aspect of the present invention, further, the upper cable is provided with a load cell.
According to a second aspect of the invention, there is provided a method for using a preloading device based on any one of the load-bearing supports, including:
s1, compacting a foundation, and excavating a foundation trench according to the position and the overall dimension of the pull-down beam;
s2, placing the pull-down beam in the foundation trench;
s3, paving the bottom pressure-bearing object on the pull-down beam;
s4, laying the bearing support on the bottom pressure-bearing object;
s5, laying the top pressure-bearing object on the bearing support;
s6, laying the upper tie beam on the top pressure bearing object;
s7, connecting two ends of the upper stay cable to the upper pull beam and the lower force transmission mechanism respectively, connecting two ends of the lower stay cable to the lower pull beam and the upper force transmission mechanism respectively, and setting the ground clearance of the jack to be 0.8-1.5 m;
s8, mounting the force measuring instrument on the upper stay cable;
and S9, starting the jack, pre-pressing the bearing support by observing the force measuring instrument, and removing the pre-pressing device after the pre-pressing requirement is met.
The invention has the beneficial effects that: the lower stay cable is anchored on the ground without using special equipment, so that the construction cost is reduced; and the jack is arranged at the position with the height of 0.8 to 1.5 meters from the ground, so that the operation is convenient for a user and the operation is safe.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.
FIG. 1 is a front view of a pre-stressing device in an embodiment of the first aspect of the present invention;
FIG. 2 is a side view of a pre-pressing device in an embodiment of the first aspect of the present invention;
fig. 3 is a structural view of a force applying device in an embodiment of the first aspect of the invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 3, the prepressing device of the load-bearing support in the first embodiment of the present invention includes an upper pulling beam 1, a lower pulling beam 2, an upper pulling cable 3, a lower pulling cable 4 and a force applying device 5, where the upper pulling beam 1 abuts against the top of the load-bearing support 8, and the lower pulling beam 2 abuts against the bottom of the load-bearing support 8, and specifically, the upper pulling beam 1 and the lower pulling beam 2 are both C-shaped steel beams, and their openings are opposite to each other, so as to prevent the upper pulling beam 1 and the lower pulling beam 2 from being deformed due to an excessive pulling force. The force application device 5 comprises an upper force transmission structure 51, a lower force transmission structure 52 and a jack 53, two ends of an upper pull rope 3 are respectively connected to the upper pull beam 1 and the lower force transmission structure 52, two ends of a lower pull rope 4 are respectively connected to the lower pull beam 2 and the upper force transmission structure 51, specifically, two ends of the upper pull rope 3 and two ends of the lower pull rope 4 are both provided with threaded structures, and the connection mode is threaded connection. The both ends of jack 53 are connected with last force transmission structure 51, lower force transmission structure 52 respectively to when jack 53 jacking, go up force transmission structure 51 and the distance increase of force transmission structure 52 down, make and go up straining beam 1 and draw down beam 2 and have the trend of being close to each other, and then realize the pre-compaction to bearing support 8. Specifically, the height of the jack 53 from the ground is set to be 0.8 to 1.5 meters, so that an operator can conveniently operate the jack 53 on the ground without high-altitude operation, and the safety risk during construction is reduced. It will be readily understood that the number of force application devices 5 can be increased or decreased as the case may be, and that the preload can be further increased by increasing the number of force application devices 5.
Furthermore, the jack 53 is a hand-operated jack, and the jack 53 is pressurized manually without other driving devices, so that the construction cost is reduced.
Further, the guy cable 3 is connected in the middle part of the upper beam 1, and the guy cable 4 is connected in the middle part of the lower beam 2, so that the stress of the upper beam 1 and the lower beam 2 is uniform, and the problems of prepressing deviation and the like caused by nonuniform stress are prevented.
Furthermore, the prepressing device of the bearing support also comprises a top pressure-bearing object 6 and a bottom pressure-bearing object 7, wherein the top pressure-bearing object 6 is attached to the top of the bearing support 8, and the upper tension beam 1 is connected with the top pressure-bearing object 6; the bottom pressure-bearing object 7 is attached to the bottom of the bearing support 8, and the pull-down beam 2 is connected with the bottom pressure-bearing object 7. The top bearing weight 6 and the bottom bearing weight 7 can evenly transmit the pulling force to the top and the bottom of the bearing support 8, and the bearing support 8 is prevented from being locally deformed due to the concentrated stress. Specifically, the top pressure-bearing object 6 and the bottom pressure-bearing object 7 may be in the shape of a strip, a plate, or a block for transmitting force, and in this embodiment, the top pressure-bearing object 6 and the bottom pressure-bearing object 7 are both beams, the top pressure-bearing object 6 is perpendicular to the upper tie beam 1, and the bottom pressure-bearing object 7 is perpendicular to the lower tie beam 2.
Furthermore, the number of the upper cable 3 and the lower cable 4 is more than two, so that the stress concentration is prevented from damaging the upper beam 1 and the lower beam 2, the applied tension is shared by increasing the number of the upper cable 3 and the lower cable 4, and the service life of the upper cable 3 and the service life of the lower cable 4 can be prolonged.
Furthermore, the upper cables 3 are distributed in an axisymmetric mode about the axis of the force application device 5, and the lower cables 4 are distributed in an axisymmetric mode about the axis of the force application device 5, so that the uniform stress of the upper pull beam 1 and the lower pull beam 2 is ensured, and the prepressing deviation is prevented.
Further, the upper force transmission structure 51 includes an upper connection plate 511, two upper cross beams 512 and an upper pulling plate 513, the upper connection plate 511 is connected with the lower cables 4, specifically, the number of the upper connection plates 511 can be increased or decreased according to actual situations, when the number of the lower cables 4 is multiple, in some embodiments, the number of the upper connection plates 511 is the same as the number of the lower cables 4, and the upper connection plates 511 are connected with the lower cables 4 in a one-to-one correspondence manner; in other embodiments, one upper connection plate 511 may be connected to more than two lower cables 4, so that the number of the upper connection plates 511 may not be identical to the number of the lower cables 4. The two ends of the upper connecting plate 511 are respectively connected to the two upper cross beams 512, and the two ends of the upper pulling plate 513 are respectively connected to the two upper cross beams 512. In this embodiment, the two upper beams 512 are parallel to each other, the upper pulling plate 513 is disposed in the middle of the two upper beams 512, and the upper connecting plates 511 are symmetrically distributed on two sides of the upper pulling plate 513 to ensure the stress balance of the upper force structure 51.
Further, the lower force transmission structure 52 includes a lower connection plate 521, two lower beams 522 and a lower connection plate 523, which are connected in a similar manner to the upper force transmission structure 51 and will not be described herein again.
Furthermore, a force measuring instrument is arranged on the upper inhaul cable 3 and used for displaying the currently applied pulling force and ensuring that the pre-pressing pressure meets the construction requirements.
The use method of the preloading device based on the load-bearing support in the second aspect embodiment of the invention comprises the following steps:
s1, compacting a foundation, and excavating a foundation trench according to the position and the overall dimension of a lower tie beam 2;
s2, placing the lower tie beam 2 in a foundation trench;
s3, paving a bottom pressure-bearing object 7 on the lower tie beam 2;
s4, laying a bearing support 8 on the bottom pressure-bearing object 7, ensuring that a stress point of the bearing support 8 can be covered by the bottom pressure-bearing object 7, and preventing rollover caused by uneven stress in the prepressing process;
s5, laying a top pressure-bearing object 6 on the bearing support 8, wherein the position and the direction of the top pressure-bearing object 6 are consistent with those of a bottom pressure-bearing object 7, so that the stress conditions of the top and the bottom of the bearing support 8 are ensured to be the same;
s6, laying an upper tie beam 1 on the top pressure-bearing object 6;
s7, connecting two ends of an upper cable 3 to the upper pull beam 1 and the lower force transmission mechanism 52 respectively, connecting two ends of a lower cable 4 to the lower pull beam 2 and the upper force transmission mechanism 51 respectively, and setting the ground clearance of a jack 53 to be 0.8-1.5 m;
s8, installing a force measuring instrument on the upper stay cable 3;
s9, starting the jack 53, pre-pressing the bearing support 8 through the observation dynamometer, and removing the pre-pressing device after the pre-pressing requirement is met.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (9)
1. A pre-compaction device of bearing support, its characterized in that includes: an upper pulling beam (1), a lower pulling beam (2), an upper pulling cable (3), a lower pulling cable (4) and a force application device (5), the upper drawing beam (1) is used for being abutted against the top of the bearing support (8), the lower drawing beam (2) is used for being abutted against the bottom of the bearing support (8), the force application device (5) comprises an upper force transmission structure (51), a lower force transmission structure (52) and a jack (53), two ends of the upper pull cable (3) are respectively connected to the upper pull beam (1) and the lower force transmission structure (52), two ends of the lower pull rope (4) are respectively connected to the lower pull beam (2) and the upper force transmission structure (51), both ends of the jack (53) are respectively connected to the upper force transmission structure (51) and the lower force transmission structure (52), the lifting jack (53) is in a hand-operated type, and the height from the ground of the lifting jack (53) ranges from 0.8 m to 1.5 m.
2. The preloading device of a load-bearing support according to claim 1, characterized in that: the upper inhaul cable (3) is connected to the middle of the upper pull beam (1), and the lower inhaul cable (4) is connected to the middle of the lower pull beam (2).
3. The preloading device of a load-bearing support according to claim 1, characterized in that: the prepressing device of the bearing support further comprises a top pressure-bearing object (6) and a bottom pressure-bearing object (7), the top pressure-bearing object (6) is used for being attached to the top of the bearing support (8), the upper tension beam (1) is connected with the top pressure-bearing object (6), the bottom pressure-bearing object (7) is used for being attached to the bottom of the bearing support (8), and the lower tension beam (2) is connected with the bottom pressure-bearing object (7).
4. The preloading device of a load-bearing support according to claim 1, characterized in that: the number of the upper pull cables (3) and the number of the lower pull cables (4) are more than two.
5. The preloading device of a load-bearing support according to claim 4, characterized in that: the upper inhaul cable (3) is in axisymmetric distribution relative to the axis of the force application device (5), and the lower inhaul cable (4) is in axisymmetric distribution relative to the axis of the force application device (5).
6. The preloading device of a load-bearing support according to claim 1, characterized in that: the upper transmission structure (51) comprises an upper connecting plate (511), two upper cross beams (512) and an upper pulling plate (513), the upper connecting plate (511) is connected with the lower cable (4), two ends of the upper connecting plate (511) are respectively connected to the two upper cross beams (512), two ends of the upper pulling plate (513) are respectively connected to the two upper cross beams (512), and the upper pulling plate (513) is connected with the first end of the jack (53).
7. The preloading device of a load-bearing support according to claim 1, characterized in that: the lower force transmission structure (52) comprises a lower connecting plate (521), two lower cross beams (522) and a lower pull plate (523), the lower connecting plate (521) is connected with the upper inhaul cable (3), two ends of the lower connecting plate (521) are connected to the two lower cross beams (522) respectively, two ends of the lower pull plate (523) are connected to the two lower cross beams (522) respectively, and the lower pull plate (523) is connected with the second end of the jack (53).
8. The preloading device of a load-bearing support according to claim 1, characterized in that: the upper pull rope (3) is provided with a force measuring instrument.
9. Use of a preloading device for a load-bearing support according to any one of claims 1 to 8, characterized in that it comprises:
s1, compacting a foundation, and excavating a foundation trench according to the position and the overall dimension of the pull-down beam (2);
s2, placing the lower tie beam (2) in the foundation trench;
s3, paving the bottom pressure-bearing object (7) on the lower tie beam (2);
s4, paving the bearing support (8) on the bottom pressure-bearing object (7);
s5, paving the top pressure-bearing object (6) on the bearing support (8);
s6, laying the upper tie beam (1) on the top pressure-bearing object (6);
s7, connecting two ends of the upper stay cable (3) to the upper pull beam (1) and the lower force transmission mechanism (52) respectively, connecting two ends of the lower stay cable (4) to the lower pull beam (2) and the upper force transmission mechanism (51) respectively, and setting the ground clearance of the jack (53) to be 0.8-1.5 m;
s8, mounting the force measuring instrument on the upper stay cable (3);
and S9, starting the jack (53), pre-pressing the bearing support (8) by observing the force measuring instrument, and removing the pre-pressing device after the pre-pressing requirement is met.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110919703.4A CN113737653A (en) | 2021-08-11 | 2021-08-11 | Prepressing device of bearing support and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110919703.4A CN113737653A (en) | 2021-08-11 | 2021-08-11 | Prepressing device of bearing support and using method thereof |
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| Publication Number | Publication Date |
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| CN113737653A true CN113737653A (en) | 2021-12-03 |
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| CN202110919703.4A Pending CN113737653A (en) | 2021-08-11 | 2021-08-11 | Prepressing device of bearing support and using method thereof |
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| CN113106871A (en) * | 2021-04-02 | 2021-07-13 | 长安大学 | Non-falling-to-ground dynamic height-adjusting support for steel plate composite beam bridge floor construction and construction method |
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|---|---|---|---|---|
| CN201128884Y (en) * | 2007-11-15 | 2008-10-08 | 中交第一公路工程局有限公司 | Loading prepressing device for suspended bracket |
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Application publication date: 20211203 |
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