CN114263097A - High-stability prefabricated bent cap - Google Patents

High-stability prefabricated bent cap Download PDF

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Publication number
CN114263097A
CN114263097A CN202111682362.XA CN202111682362A CN114263097A CN 114263097 A CN114263097 A CN 114263097A CN 202111682362 A CN202111682362 A CN 202111682362A CN 114263097 A CN114263097 A CN 114263097A
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supporting steel
rod
bent cap
shearing
shell
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CN114263097B (en
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刘浪
马长龙
徐漫菲
施文辉
罗浩
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Chongqing Jiaotong University
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Chongqing Jiaotong University
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Abstract

The invention relates to the field of bridge structures, and particularly discloses a high-stability prefabricated bent cap which comprises a bent cap shell and an inner support steel frame; the top of the cover beam shell is opened, the cover beam shell is made of UHPC materials, the inner supporting steel frame comprises two supporting steel plates, a truss is arranged between the supporting steel plates, and a plurality of connecting steel beams which are distributed at equal intervals are fixed between the truss and the supporting steel plates; a plurality of horizontally-oriented concave cavities are formed in the supporting steel plates, the end part of each concave cavity, which faces the other supporting steel plate, penetrates through the supporting steel plates, coaxial anti-shearing rods are arranged in the concave cavities, the end parts of the anti-shearing rods extend out of the cavities, and gaps are reserved between the anti-shearing rods and the side walls of the cavities; a plurality of connecting grooves which are uniformly distributed are formed on the periphery of the concave cavity, the connecting grooves face to the center of the concave cavity, hydraulic energy dissipation devices are fixed in the connecting grooves, a plurality of guide rods are arranged on the periphery of the anti-shearing rod in a spherical hinge mode, and the guide rods are connected with output ends of the corresponding hydraulic energy dissipation devices in a spherical hinge mode; the present invention is intended to provide a solution to the problem of easy separation of the prefabricated shell and core of the capping beam.

Description

High-stability prefabricated bent cap
Technical Field
The invention relates to the technical field of bridge structures, and particularly discloses a high-stability prefabricated bent cap.
Background
With the continuous development of bridge construction technology, the span and height of a bridge break records continuously, so that the sizes of structures of all parts of the bridge are huge; the bent cap is an indispensable ring in bridge composition as a structure for supporting an upper structure of a bridge. And among the conventional construction methods of bent cap, prefabricated bent cap is with the characteristics of high efficiency, safety, high-quality, quick, environmental protection in the wide use of building trade, nevertheless because the size of large-span prefabricated bent cap is too huge, is difficult to the transportation, consequently adopts precast concrete bent cap shell, very big lightening bent cap dead weight, after prefabricated bent cap shell installation, only need pour the construction that the bent cap inner core can accomplish the bent cap, very big construction efficiency who has accelerated. Among the above-mentioned construction mode, because bent cap inner core and bent cap shell are pour in grades, when taking place vibrations, the roof beam body will shake the conduction to the bent cap inner core through pre-buried roof beam structure that prevents falling, make bent cap inner core and bent cap shell take place relative motion, lead to the easy and bent cap shell separation of bent cap inner core, reduce the stability of bent cap, can lead to the bent cap inner core to break away from the bent cap shell when serious, influence the holistic stability ability of bridge.
Disclosure of Invention
The invention aims to provide a high-stability prefabricated capping beam to solve the problem that a prefabricated capping beam outer shell is easy to separate from a capping beam inner core.
In order to achieve the purpose, the basic scheme of the invention is as follows:
a high-stability prefabricated bent cap comprises a bent cap shell and an internal support steel frame; the top of the cover beam shell is provided with an opening, the cover beam shell is made of UHPC material, the inner supporting steel frame comprises two symmetrically arranged supporting steel plates, a truss is arranged between the supporting steel plates, and a plurality of connecting steel beams which are distributed at equal intervals are fixed between the truss and the supporting steel plates; a plurality of horizontally-oriented concave cavities are formed in the supporting steel plates, the end part of each concave cavity, which faces the other supporting steel plate, penetrates through the supporting steel plates, coaxial anti-shearing rods are arranged in the concave cavities, the end parts of the anti-shearing rods extend out of the cavities, and gaps are reserved between the anti-shearing rods and the side walls of the cavities; a plurality of connecting grooves which are uniformly distributed are formed in the periphery of the concave cavity, the connecting grooves face to the center of the concave cavity, hydraulic energy dissipation devices are fixed in the connecting grooves, a plurality of guide rods are hinged on the periphery of the anti-shearing rod in a spherical manner, and the guide rods are connected with output ends of the corresponding hydraulic energy dissipation devices in a spherical hinge manner; and a plurality of connecting rods are arranged between the supporting steel plate and the cover beam shell.
According to the scheme, after the combined beam is installed on the pier stud, the anti-falling beam device is pre-embedded in the bent cap shell, concrete is poured into the bent cap shell, the concrete and the truss form a bent cap inner core, and therefore the integral installation of the bent cap is completed, and the whole construction process is simple, convenient and rapid; when vibration occurs, the beam body transmits the vibration to the inner core of the bent cap through the anti-falling beam structure, when the vibration is in the horizontal direction, the inner core of the bent cap horizontally displaces, and the support steel plate is utilized to limit the movement of the inner core of the bent cap in the horizontal direction, so that the inner core of the bent cap is prevented from directly impacting on the outer shell of the bent cap, and the outer shell of the bent cap is prevented from being damaged; when the vibration is vertical, the inner core of the bent cap has a vertical displacement trend along with the beam body, and when the vibration is small, the inner core of the bent cap and the supporting steel plate are connected and fixed through the connecting steel beam to limit the vertical displacement of the inner core of the bent cap, so that the effect of protecting the bent cap is achieved; when vibrations are great, the connection girder steel fracture, the vertical displacement takes place for the bent cap inner core, drive anti-shear rod during the bent cap inner core displacement and take place vertical displacement, then transmit kinetic energy to hydraulic energy consumption device through the guide arm of week side during anti-shear rod displacement, utilize hydraulic energy consumption device to consume energy, subtract the kinetic energy of consuming the bent cap inner core, prevent the bent cap inner core and support steel plate separation, support steel plate then keeps being connected with the bent cap shell through the connecting rod, thereby restriction bent cap inner core breaks away from the bent cap shell, avoid the bent cap inner core and the roof beam body to break away from the pier stud, can effectual stability that improves the bent cap, thereby improve the holistic stability of bridge.
Optionally, the connecting rod comprises a fixed block embedded in the shell of the bent cap, a coaxial rod body is arranged on the fixed block, the diameter of the rod body is smaller than that of the fixed block, the rod body is coaxial with the corresponding shear resistant rod, and the end part of the rod body is fixedly connected with the corresponding supporting steel plate; the rod body is hollow, a coaxial connecting rod is connected in the rod body in a sliding mode, and a buffer spring is fixed between the connecting rod and the rod body; the other end of the cavity is provided with a sliding groove, the movable end of the connecting rod extends into the cavity through the sliding groove, the movable end of the connecting rod is fixed with a limiting seat, the end face of the limiting seat is provided with a conical groove, a spherical bulge is fixed on the end part of the anti-shearing rod facing the connecting rod, and the bulge is attached to the conical groove.
When the vertical vibration occurs, the inner core of the bent cap drives the anti-shearing rod to vertically reciprocate, the anti-shearing rod pushes the limiting seat to horizontally reciprocate through the spherical bulge at the end part when vertically reciprocating, the connecting rod is driven to horizontally reciprocate in the rod body when the limiting seat horizontally reciprocates, the buffer spring is continuously extruded or stretched when the connecting rod horizontally reciprocates, the buffer spring is utilized to perform secondary energy consumption buffering, the kinetic energy of the inner core of the bent cap is further consumed in an auxiliary mode, and the overall stability of the bent cap is improved; and during the horizontal reciprocating motion of connecting rod, the connecting rod constantly strikes on the fixed block to conduct to the bent cap shell through the fixed block on, with this with kinetic energy conversion to the bent cap shell on, further carry out supplementary power consumption to the bent cap inner core, and the bent cap shell is constantly receiving the striking after damaging, only needs the installation template to pour the bent cap shell again, ensures the normal use of power consumption safeguard function, can regard as interim support with the bent cap, ensures the normal use of bridge at a certain time.
Optionally, one end of the anti-shearing rod, which is far away from the cavity, is fixed with a stepped limiting block, the limiting block is fixed with a protective sleeve which is attached to the supporting steel plate, the protective sleeve and the anti-shearing rod are coaxial, and the outer diameter of the protective sleeve is larger than the aperture of the connecting hole.
The stepped limiting blocks are utilized to strengthen the firm connection between the anti-shearing rods and the limiting blocks, so that the anti-shearing rods are prevented from being separated from the inner core of the bent cap; the protective sleeve shields and protects the connecting hole, and prevents concrete from flowing into the concave cavity through the connecting hole when the inner core of the cover beam is poured, so that the anti-shearing rod cannot move in the connecting hole.
Optionally, the fixed block is in threaded connection with the end of the rod body, a through hole coaxial with the rod body is formed in the fixed block, an impact block is connected in the through hole in a sliding mode, and a reset spring is arranged between the impact block and the through hole.
When the connecting rod moves horizontally, the connecting rod continuously impacts the impact block, the reset spring plays a role in resetting the impact block, so that the impact block slides in the through hole in a reciprocating mode, the impact block continuously extends out of the through hole in the reciprocating sliding process and impacts the cover beam shell, and kinetic energy is conducted to the cover beam shell.
Optionally, an annular anti-collision ring is arranged on the periphery of the anti-shearing rod, the outer diameter of the anti-collision ring is smaller than the aperture of the connecting hole, and the anti-collision ring is made of an elastic material.
Through setting up the anticollision circle, reduce the collision between anti-shear bar and the connecting hole pore wall, prevent anti-shear bar fracture.
Optionally, the hydraulic consumer is a hydraulic damper.
Optionally, a diagonal brace is fixed between the rod body and the support steel plate; the rod body is supported through the inclined strut, and the rod body is prevented from being broken.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a longitudinal cross-sectional view of an embodiment of the present invention;
FIG. 3 is an enlarged schematic view at A in FIG. 2;
fig. 4 is an enlarged schematic view of fig. 2 at B.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the structure comprises a bent cap shell 1, a supporting steel plate 2, a truss 3, a connecting steel beam 4, a cavity 5, an anti-shearing rod 6, a guide rod 7, a fixing block 8, a rod body 9, a connecting rod 10, a buffer spring 11, a limiting seat 12, a protrusion 13, a limiting block 14, a protective sleeve 15, an impact block 16, a return spring 17, an anti-collision ring 18, a hydraulic energy consumption device 19 and an inclined stay bar 20.
Examples
As shown in fig. 1, 2, 3 and 4:
a high-stability prefabricated bent cap comprises a bent cap shell 1 and an internal support steel frame; the top of the bent cap shell 1 is provided with an opening, the bent cap shell 1 is made of UHPC materials, the inner supporting steel frame comprises two symmetrically arranged supporting steel plates 2, a truss 3 is arranged between the supporting steel plates 2, and a plurality of connecting steel beams 4 which are distributed at equal intervals are fixed between the truss 3 and the supporting steel plates 2; a plurality of horizontally-oriented cavities are formed in the supporting steel plates 2, the end part of each cavity, which faces the other supporting steel plate 2, penetrates through the supporting steel plates 2, coaxial anti-shearing rods 6 are arranged in the cavities, the end parts of the anti-shearing rods 6 extend out of the cavities 5, and gaps are reserved between the anti-shearing rods 6 and the side walls of the cavities 5; a plurality of connecting grooves which are uniformly distributed are formed in the periphery of the concave cavity, the connecting grooves face the center of the concave cavity, hydraulic energy consumption devices 19 are fixed in the connecting grooves, a plurality of guide rods 7 are arranged on the periphery of the anti-shearing rod 6 in a spherical hinge mode, and the guide rods 7 are connected with output ends of the corresponding hydraulic energy consumption devices 19 in a spherical hinge mode; and a plurality of connecting rods are arranged between the supporting steel plate 2 and the bent cap shell 1.
According to the scheme, after the combined beam is installed on a pier stud, the anti-falling beam device is pre-embedded in the bent cap shell 1, concrete is poured into the bent cap shell 1, the concrete and the truss 3 form a bent cap inner core, and therefore the integral installation of the bent cap is completed, and the whole construction process is simple, convenient and rapid; when vibration occurs, the beam body transmits the vibration to the inner core of the bent cap through the anti-falling beam structure, when the vibration is in the horizontal direction, the inner core of the bent cap horizontally displaces, at the moment, the support steel plate 2 is utilized to limit the movement of the inner core of the bent cap in the horizontal direction, and the inner core of the bent cap is prevented from directly impacting on the outer shell 1 of the bent cap to cause the damage of the outer shell 1 of the bent cap; when the vibration is vertical, the inner core of the bent cap has a vertical displacement trend along with the beam body, and when the vibration is small, the inner core of the bent cap is fixedly connected with the supporting steel plate 2 through the connecting steel beam 4 to limit the vertical displacement of the inner core of the bent cap, so that the effect of protecting the bent cap is achieved; when vibrations are great, connecting steel beam 4 breaks, the bent cap inner core takes place vertical displacement, driving anti-shear rod 6 to take place vertical displacement during the bent cap inner core displacement, then transmit kinetic energy to hydraulic energy consumption device 19 through guide arm 7 of week side during anti-shear rod 6 displacement, utilize hydraulic energy consumption device 19 to consume energy, subtract the kinetic energy of loss bent cap inner core, prevent the bent cap inner core and support steel plate 2 separation, support steel plate 2 then keeps being connected with bent cap shell 1 through the connecting rod, thereby restrict the bent cap inner core and break away from bent cap shell 1, avoid the bent cap inner core and the roof beam body to break away from the pier stud, can effectual improvement bent cap's stability, thereby improve the holistic stability of bridge.
Optionally, the connecting rod comprises a fixed block 8 embedded in the bent cap shell 1, a coaxial rod body 9 is arranged on the fixed block 8, the diameter of the rod body 9 is smaller than that of the fixed block 8, the rod body 9 is coaxial with the corresponding shear resistant rod 6, and the end part of the rod body 9 is fixedly connected with the corresponding support steel plate 2; the rod body 9 is hollow, a coaxial connecting rod 10 is connected in the rod body 9 in a sliding mode, and a buffer spring 11 is fixed between the connecting rod 10 and the rod body 9; the other end of the cavity is provided with a sliding groove, the movable end of the connecting rod 10 extends into the cavity through the sliding groove, the movable end of the connecting rod 10 is fixed with a limiting seat 12, the end face of the limiting seat 12 is provided with a conical groove, a spherical bulge 13 is fixed on the end part, facing the connecting rod 10, of the anti-shearing rod 6, and the bulge 13 is attached to the conical groove.
When the vertical vibration occurs, the inner core of the bent cap drives the anti-shearing rod 6 to vertically reciprocate, the anti-shearing rod 6 pushes the limiting seat 12 to horizontally reciprocate through the spherical bulge 13 at the end part when the vertical reciprocating movement occurs, the limiting seat 12 drives the connecting rod 10 to horizontally reciprocate in the rod body 9 when the horizontal reciprocating movement occurs, the buffer spring 11 is continuously extruded or stretched when the connecting rod 10 horizontally reciprocates, the buffer spring 11 is utilized to perform secondary energy consumption buffering, the kinetic energy of the inner core of the bent cap is further consumed in an auxiliary mode, and the integral stability of the bent cap is improved; when the connecting rod 10 horizontally reciprocates, the connecting rod 10 continuously impacts on the fixing block 8 and is conducted to the cover beam shell 1 through the fixing block 8, so that kinetic energy is converted to the cover beam shell 1, energy consumption is further assisted on the cover beam inner core, after the cover beam shell 1 is continuously impacted and damaged, the cover beam shell 1 is only required to be poured again by installing a template, normal use of the energy consumption protection function is ensured, the cover beam can be used as a temporary support, and normal use of the bridge at a certain time is ensured.
Optionally, one end, away from the cavity, of the anti-shear rod 6 is fixed with a stepped limiting block 14, a protective sleeve 15 attached to the supporting steel plate 2 is fixed on the limiting block 14, the protective sleeve 15 is coaxial with the anti-shear rod 6, and the outer diameter of the protective sleeve 15 is larger than the aperture of the connecting hole.
The connection between the anti-shearing rod 6 and the limiting block 14 is strengthened by the stepped limiting block 14, so that the anti-shearing rod 6 is prevented from being separated from the inner core of the bent cap; and the protective sleeve 15 shields and protects the connecting hole, so that when the inner core of the cover beam is poured, concrete flows into the concave cavity through the connecting hole, and the anti-shearing rod 6 cannot move in the connecting hole.
Optionally, the fixed block 8 is in threaded connection with the end of the rod body 9, a through hole coaxial with the rod body 9 is formed in the fixed block 8, an impact block 16 is connected in the through hole in a sliding mode, and a return spring 17 is arranged between the impact block 16 and the through hole.
When the connecting rod 10 moves horizontally, the connecting rod 10 continuously impacts the impact block 16, and the return spring 17 plays a role in returning the impact block 16, so that the impact block 16 slides in the through hole in a reciprocating manner, and the impact block 16 continuously extends out of the through hole to impact on the bent cap shell 1 in the reciprocating sliding process, so that kinetic energy is transmitted to the bent cap shell 1.
Optionally, an annular anti-collision ring 18 is arranged on the periphery of the anti-shearing rod 6, the outer diameter of the anti-collision ring 18 is smaller than the bore diameter of the connecting hole, and the anti-collision ring 18 is made of an elastic material.
Through setting up anticollision circle 18, reduce the collision between anti-shear bar 6 and the connecting hole pore wall, prevent that anti-shear bar 6 from splitting.
Optionally, the hydraulic consumer 19 is a hydraulic damper.
Optionally, a diagonal brace 20 is fixed between the rod body 9 and the supporting steel plate 2; the rod body 9 is supported by the diagonal brace 20, and the rod body 9 is prevented from being broken.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the present invention.

Claims (7)

1. The utility model provides a prefabricated bent cap of high stability which characterized in that: comprises a cover beam shell and an internal support steel frame; the top of the cover beam shell is provided with an opening, the cover beam shell is made of UHPC material, the inner supporting steel frame comprises two symmetrically arranged supporting steel plates, a truss is arranged between the supporting steel plates, and a plurality of connecting steel beams which are distributed at equal intervals are fixed between the truss and the supporting steel plates; a plurality of horizontally-oriented concave cavities are formed in the supporting steel plates, the end part of each concave cavity, which faces the other supporting steel plate, penetrates through the supporting steel plates, coaxial anti-shearing rods are arranged in the concave cavities, the end parts of the anti-shearing rods extend out of the cavities, and gaps are reserved between the anti-shearing rods and the side walls of the cavities; a plurality of connecting grooves which are uniformly distributed are formed in the periphery of the concave cavity, the connecting grooves face to the center of the concave cavity, hydraulic energy dissipation devices are fixed in the connecting grooves, a plurality of guide rods are hinged on the periphery of the anti-shearing rod in a spherical manner, and the guide rods are connected with output ends of the corresponding hydraulic energy dissipation devices in a spherical hinge manner; and a plurality of connecting rods are arranged between the supporting steel plate and the cover beam shell.
2. A high stability precast capping beam as set forth in claim 1, wherein: the connecting rod comprises a fixed block embedded in the shell of the bent cap, a coaxial rod body is arranged on the fixed block, the diameter of the rod body is smaller than that of the fixed block, the rod body is coaxial with the corresponding shear resistant rod, and the end part of the rod body is fixedly connected with the corresponding supporting steel plate; the rod body is hollow, a coaxial connecting rod is connected in the rod body in a sliding mode, and a buffer spring is fixed between the connecting rod and the rod body; the other end of the cavity is provided with a sliding groove, the movable end of the connecting rod extends into the cavity through the sliding groove, the movable end of the connecting rod is fixed with a limiting seat, the end face of the limiting seat is provided with a conical groove, a spherical bulge is fixed on the end part of the anti-shearing rod facing the connecting rod, and the bulge is attached to the conical groove.
3. A high stability precast capping beam as set forth in claim 2, wherein: one end of the anti-shearing rod far away from the cavity is fixedly provided with a stepped limiting block, the limiting block is fixedly provided with a protective sleeve attached to the supporting steel plate, the protective sleeve and the anti-shearing rod are coaxial, and the outer diameter of the protective sleeve is larger than the aperture of the connecting hole.
4. A high stability precast capping beam as set forth in claim 3, wherein: the fixing block is in threaded connection with the end of the rod body, a through hole coaxial with the rod body is formed in the fixing block, an impact block is connected in the through hole in a sliding mode, and a reset spring is arranged between the impact block and the through hole.
5. A high stability precast capping beam according to claim 4, wherein: the anti-shearing rod is provided with annular anticollision circle in week side, and the external diameter of anticollision circle is less than the aperture of connecting hole, the anticollision circle is the elasticity material.
6. A high stability precast capping beam according to claim 5, wherein: the hydraulic energy consumption device is a hydraulic damper.
7. A high stability precast capping beam according to claim 6, wherein: and an inclined stay bar is fixed between the rod body and the supporting steel plate.
CN202111682362.XA 2021-12-30 2021-12-30 Prefabricated bent cap of high stability Active CN114263097B (en)

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