CN210596965U - Medium-low speed magnetic levitation double-line continuous whole-hole big box girder - Google Patents
Medium-low speed magnetic levitation double-line continuous whole-hole big box girder Download PDFInfo
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- CN210596965U CN210596965U CN201920607774.9U CN201920607774U CN210596965U CN 210596965 U CN210596965 U CN 210596965U CN 201920607774 U CN201920607774 U CN 201920607774U CN 210596965 U CN210596965 U CN 210596965U
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Abstract
The utility model discloses a well low-speed magnetism floats earlier simple prop back continuous whole hole big case roof beam in succession of double-line, including the limit hole roof beam of locating the circuit both ends and locate a plurality of centre hole roof beams between the limit hole roof beam, limit hole roof beam and centre hole roof beam are back style of calligraphy cross-sectional structure, and its top surface both sides are outside to be extended and are constituted the bridge pterygoid lamina, the limit hole roof beam includes limit hole roof beam concrete beam (1), limit hole roof beam concrete beam (1) and the adjacent one end of centre hole roof beam reason be equipped with limit hole roof beam simple prop and become continuous vertical prestressing tendons (3), centre hole roof beam is including centre hole roof beam concrete beam (6), and the reason is equipped with centre hole roof beam simple prop and become continuous vertical prestressing tendons (8) on this centre hole roof beam concrete beam (6) both ends. The utility model discloses a big case roof beam changes well low-speed magnetism conventional standard span bridge structures into earlier simply supported back continuous beam by the simply supported roof beam, and the dog-ear rail face irregularity that the beam gap position that has significantly reduced two adjacent hole simply supported roof beams formed along with the bridge deformation.
Description
Technical Field
The utility model belongs to the technical field of well low-speed magnetism floats track traffic, more specifically relates to a well low-speed magnetism floats big case roof beam of continuous whole hole in two lines letter earlier back.
Background
The medium-low speed magnetic levitation track traffic adopts a normal conducting electromagnet suction type levitation and guiding technology, and realizes the levitation and guiding of the vehicle through the electromagnetic attraction between the U-shaped electromagnet on the vehicle levitation frame and the F-shaped steel track.
At present, a conventional standard span bridge structure of medium-low speed magnetic levitation generally adopts a simply supported beam with a span of 20-40 m, and the transverse arrangement of the line positive line double-line simply supported beam adopts an arrangement form of a juxtaposition type single-line prefabricated small box beam and a cross brace and also adopts an arrangement form of a prefabricated whole-hole large box beam and a rail bearing platform. Generally, after the construction of the bridge structure is completed, a track structure is constructed on the bridge. When the local part of the line is positioned on the radius of a small curve, a porous 20-40 m span continuous beam is also adopted, but the construction is usually carried out by adopting a bridge site support cast-in-place construction method.
The single-section train of the medium-low speed maglev train adopts a 5-module suspension frame structure, the length of each suspension frame module is about 2.8m, the rated suspension gap is 8-10 mm, the fluctuation of the suspension gap is +/-4 mm in normal operation, and the suspension frames are in orbital motion, namely, in a normal operation state, the gap between the suspension frame and the top plate and the bottom surface of the track structure is 8 +/-4-10 +/-4 mm, and the track structure and the bridge and other structures supporting the track structure have certain construction errors and deformation, so that the requirements of the medium-low speed maglev train on the smoothness of the track structure and the deformation of the bridge and other structures supporting the track structure are higher.
However, when the vehicle runs, the suspension frame runs under the control of the suspension controller which is calculated and analyzed at a high speed, and can quickly react and follow according to the height of the track, so that the gap between the suspension frame and the top plate and the bottom surface of the track structure can always meet the passing requirement of the suspension frame. The result of the vertical curve passing ability analysis of each suspension frame module (about 2.8m in length) of the medium-low speed maglev train shows that the suspension frame rail-holding running mechanism can adapt to the vertical curve radius of which the minimum R is 1500m (the vertical curve radius is the vertical curve radius of the instantaneous rail surface under the train containing various deformation factors, the same applies below), so that the suspension frame can normally pass as long as the medium-low speed maglev train runs on a continuous track with the curve radius larger than 1500 m. However, the slotted track generally adopted by medium-low speed magnetic levitation transportation at present, that is, the track is not continuous, once the discontinuous track is subjected to angular deformation, the trafficability of the levitation frame is reduced or limited, and the excessive angular deformation may even cause the levitation frame to impact the track and be stuck on the track, as shown in fig. 1. If the conventional standard span bridge structure adopts the simply supported beam, when the simply supported beam bends downwards, a break angle is formed at the beam seam position of the two adjacent hole simply supported beams, the track on the bridge is also subjected to break angle deformation under the driving of bridge deformation, when the break angle is large, the passing capacity of the suspension frame of the maglev train can be influenced, and the suspension frame is easy to generate large fluctuation at the rail surface break angle position, so that the riding comfort of the vehicle is influenced. In addition, the conventional standard span bridge structure in the prior art adopts the simply supported beam, which is not beneficial to the passing of the suspension frame and influences the riding comfort of the vehicle, and the other problem is that when the simply supported beam is adopted, the beam height of the bridge is large, so that more building materials are consumed, the investment is increased, the appearance is thick and bulky, and the attractiveness of the bridge is influenced.
SUMMERY OF THE UTILITY MODEL
To the above defect of prior art or improve the demand, the utility model provides a well low-speed maglev double-line letter props up the continuous whole hole big case roof beam in back earlier, a purpose is that, change well low-speed maglev traffic conventional standard span bridge structure into earlier letter back continuous beam by the letter roof beam, the break angle rail surface irregularity that the beam gap position that has significantly reduced adjacent two hole letter roof beams formed along with the bridge deformation, dynamic rail surface under the train load effect is more smooth-going, be favorable to maglev train's the suspension frame steadily to pass through near the mound top, make maglev vehicle's the travelling comfort of taking better.
In order to realize the above-mentioned purpose, the utility model provides a well low-speed magnetism floats after the earlier simple support continuous whole hole big case roof beam of double-line locates on the bridge pier, include:
the two sides of the top surface of the side hole beam and the middle hole beam extend outwards to form a bridge wing plate so as to increase the transverse width of the top section of the beam and facilitate laying and erecting a double-line track;
the edge hole beam comprises an edge hole beam concrete beam, and an edge hole beam simply supported variable continuous longitudinal prestressed rib is arranged on the upper edge of one end, adjacent to the middle hole beam, of the edge hole beam concrete beam;
the middle hole beam comprises a middle hole beam concrete beam, and middle hole beam simply supported variable continuous longitudinal prestressed ribs are arranged on the upper edges of two ends of the middle hole beam concrete beam;
the end parts of the edge hole beam simple support variable continuous longitudinal prestressed tendon and the middle hole beam simple support variable continuous longitudinal prestressed tendon are provided with reserved tensioning grooves for tensioning prestressed reinforcements, and the edge hole beam and the middle hole beam are connected into a whole to jointly form a continuous whole-hole large box beam after simple support.
Further, edge hole beam longitudinal prestressed tendons are arranged in the edge hole beam concrete beam according to the stress requirement;
the longitudinal prestressed tendons of the side hole beam are multiple and are of a linear structure with two ends being scattered and upwarped and the middle being parallel and concentrated.
Furthermore, a middle hole beam longitudinal prestressed tendon is arranged in the middle hole beam concrete beam according to the stress requirement;
the middle hole beam longitudinal prestressed tendons are multiple and are of a linear structure with two ends being scattered and upwarped and the middle being parallel and concentrated.
Furthermore, the edge hole beam concrete beam is butted with the middle hole beam concrete beam at one end, and reserved post-pouring notches are respectively arranged at two ends of the middle hole beam concrete beam.
Furthermore, one end of the side hole beam is provided with a side hole beam temporary support, and the other end of the side hole beam is provided with a side hole beam permanent support.
The two ends of the middle hole beam concrete beam are respectively provided with a middle hole beam temporary support;
and the end parts of the middle hole beams are butted through the middle hole beam temporary supports, the middle hole beams are butted with the side hole beams through the side hole beam temporary supports, and concrete is poured at the reserved post-pouring groove opening.
Furthermore, the edge hole beam and the middle hole beam are adjacent, and the simply-supported continuous longitudinal prestressed tendon of the middle hole beam and the simply-supported continuous longitudinal prestressed tendon of the edge hole beam adopt the same prestressed tendon;
between two adjacent middle hole beams, the middle hole beam simply supported variable continuous longitudinal prestressed tendons and the side hole beam simply supported variable continuous longitudinal prestressed tendons adopt the same prestressed tendons or different prestressed tendons.
Furthermore, the edge hole beam concrete beam is butted with the middle hole beam concrete beam at one end, and reserved post-pouring notches are respectively arranged at two ends of the middle hole beam concrete beam.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
1. the utility model discloses an earlier simple prop back continuous whole hole big case roof beam, change well low-speed maglev traffic conventional standard span bridge construction into earlier simple prop back continuous beam by the simple girder, the roof beam seam position that has significantly reduced two adjacent hole simple girders is along with the dog-ear rail surface irregularity that the bridge warp formation, dynamic rail surface under the train loading effect is more smooth-going, be favorable to maglev train's suspension frame steadily to pass through near the track region of mound top, make maglev vehicle's the travelling comfort of taking better.
2. The utility model discloses an earlier simple prop back continuous whole hole big case roof beam changes well low-speed magnetism to float conventional standard span bridge construction of traffic into earlier simple prop back continuous beam by simple prop roof beam, under equal bridge construction deformation limit value standard, earlier simple prop back continuous beam's roof beam height can be lower than simple prop roof beam to can reduce the engineering investment.
3. The utility model discloses a big case roof beam of whole hole in succession behind earlier letter, locate the continuous single line roof beam in the earlier letter back on the pier including the symmetry, the continuous single line roof beam in the earlier letter back includes a hole limit hole roof beam and a plurality of hole centre hole roof beam, reserves the back between limit hole roof beam and the centre hole roof beam and waters the notch, and the vertical ordinary reinforcing bar of concrete beam waters the notch position at back and stretches out, treats to put up the roof beam after and reserves the vertical ordinary reinforcing bar that waters the notch and stretch out with adjacent precast beam and is connected to pour the concrete, thereby constitute the continuous single line roof beam in the earlier letter back.
4. The utility model discloses an earlier simple whole hole big case roof beam in succession after, limit hole roof beam concrete beam and the adjacent one end of middle hole roof beam reason are equipped with the simple change of limit hole roof beam and become continuous vertical prestressed tendons, and the tip that the simple change becomes continuous vertical prestressed tendons is equipped with reserves the tensioning groove for the tensioning prestressed tendons, the simple prestressing tendons radical, the linear and the arrangement position that become continuous vertical prestressed tendons of limit hole roof beam calculate according to structure atress needs and confirm.
5. The utility model discloses an earlier simple prop back big case roof beam of continuous whole hole in succession, the inside vertical prestressing tendons of boundary hole roof beam that sets up according to the atress needs of boundary hole roof beam concrete beam, the prestressing force that the vertical prestressing tendons of boundary hole roof beam produced is except being used for balanced bridge dead weight, the lower edge tensile stress of the concrete beam of production, still be used for balanced live load and the lower edge tensile stress of the concrete beam that produces such as second phase dead load, after balanced above-mentioned tensile stress, the prestressing force that the vertical prestressing tendons of boundary hole roof beam produced still should remain certain compressive stress deposit at the lower edge of concrete beam.
6. The utility model discloses an earlier simply prop continuous whole hole big case roof beam in back, at boundary hole roof beam and the adjacent position of middle hole roof beam, the simple continuous vertical prestressing tendons that becomes of middle hole roof beam and the simple continuous vertical prestressing tendons that becomes of boundary hole roof beam adopt the same prestressing tendons, between two adjacent middle hole roof beams, the simple continuous vertical prestressing tendons that becomes of middle hole roof beam can adopt the same prestressing tendons with the simple continuous vertical prestressing tendons that becomes of boundary hole roof beam, also can adopt different prestressing tendons.
Drawings
FIG. 1 is a schematic view of a suspension passing through a track undergoing angular deformation in the present stage;
FIG. 2 is an elevation view of an edge hole beam according to an embodiment of the present invention;
fig. 3 is an elevation view of an intermediate hole beam in an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view taken along section 1-1 of FIG. 1;
FIG. 5 is a schematic cross-sectional view taken along section 2-2 of FIG. 1;
FIG. 6 is a schematic cross-sectional view taken along section 3-3 of FIG. 1;
FIG. 7 is a schematic cross-sectional view taken along section 4-4 of FIG. 2;
FIG. 8 is a schematic cross-sectional view taken along section 5-5 of FIG. 2;
fig. 9 is a schematic elevation view of a construction step 1 of a construction method according to an embodiment of the present invention;
fig. 10 is a schematic elevation view of a construction step 2 of a construction method according to an embodiment of the present invention;
fig. 11 is a schematic elevation view of construction step 3 of a construction method according to an embodiment of the present invention;
fig. 12 is a schematic elevation view of a construction step 4 of a construction method according to an embodiment of the present invention;
FIG. 13 is a partial enlarged view of region A in FIG. 8;
FIG. 14 is a partial enlarged view of region B in FIG. 9;
FIG. 15 is a partial enlarged view of region C of FIG. 10;
fig. 16 is a partial enlarged view of a region D in fig. 11.
In all the figures, the same reference numerals denote the same features, in particular: 1-side hole beam concrete beam, 2-side hole beam longitudinal prestressed tendon, 3-side hole beam simple support variable continuous longitudinal prestressed tendon, 4-side hole beam permanent support, 5-side hole beam temporary support, 6-middle hole beam concrete beam, 7-middle hole beam longitudinal prestressed tendon, 8-middle hole beam simple support variable continuous longitudinal prestressed tendon, 9-middle hole beam temporary support, 11-middle hole beam permanent support, 12-bridge abutment and 13-concrete.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
As shown in fig. 8, the embodiment of the present invention provides a middle-low speed magnetic levitation double-line continuous whole-hole large box girder composed of 2-hole side hole beams and a plurality of hole middle hole beams (the first 1 st hole and the last 1 st hole beam of the first simple support back continuous beam are collectively referred to as "side hole beams", and the middle hole beams except the 1 st hole and the last 1 hole beam are collectively referred to as "middle hole beams"), and only 2-hole middle hole beams are illustrated in fig. 9-12, and according to actual specific situations, the middle hole beams may be 1 hole, also may be 2 holes, also may be porous, and are determined according to the number of actual needs. The span of the edge hole beam and the middle hole beam (the central distance of two supports along the longitudinal direction of the bridge) is determined according to actual needs, and the beam height is determined according to the stress and construction requirements. The embodiment only illustrates the equal-height beam, and according to the actual situation, the edge hole beam and the middle hole beam can be the equal-height beam or the variable-height beam, which is determined according to the requirements of stress, structure, modeling and the like. The utility model discloses a well low-speed maglev double-line is whole hole big case roof beam in succession after simply supporting earlier, change well low-speed maglev traffic conventional standard span bridge construction into the continuous roof beam in simple supporting earlier by the simple supporting roof beam, the dog-ear rail face irregularity that the beam gap position that has significantly reduced two adjacent hole simple supporting roof beams formed along with the bridge deformation, dynamic rail face under the train loading effect is more smooth-going, be favorable to maglev train's the suspension frame steadily to pass through near the mound top track region, make maglev vehicle's the travelling comfort of taking better.
As shown in fig. 2 and 4 to 6, the edge hole beam concrete beam 1 has a cross-section structure in a shape of a Chinese character 'hui' (including concrete main longitudinal beams and common steel bars inside the concrete main longitudinal beams, no prestressed reinforcing bars, and no cross braces or transverse connection structures between two adjacent main longitudinal beams), and two sides of the top surface of the edge hole beam concrete beam 1 extend outwards to form a wing plate structure, so that the transverse width of the top surface of the edge hole beam concrete beam 1 is increased, and a double track structure is convenient to arrange on the top surface. The side hole beam concrete beam 1 is internally provided with side hole beam longitudinal prestressed tendons 2 according to the stress requirement, the prestress generated by the side hole beam longitudinal prestressed tendons 2 is used for balancing the lower edge tensile stress of the concrete beam generated by the dead weight of the bridge (the dead weight when a simply supported beam structure system is prefabricated), the lower edge tensile stress of the concrete beam generated by live load, second-stage dead load and the like, and after the tensile stress is balanced, the prestress generated by the side hole beam longitudinal prestressed tendons 2 also needs to be reserved at the lower edge of the concrete beam to have certain compressive stress reserve. The number, the line shape and the arrangement position of the prestressed tendons of the longitudinal prestressed tendons 2 of the side hole beam are calculated and determined according to the structural stress requirement, preferably a plurality of prestressed tendons, the two ends of the prestressed tendons are dispersed and upwarped, the middle of the prestressed tendons is in a parallel and concentrated line structure, and the positions and the line shapes in the figure are only schematic.
The adjacent one end of limit hole roof beam concrete beam 1 and middle hole roof beam is equipped with reserves post-cast groove mouth for concreting 13, and the vertical ordinary reinforcing bar of concrete beam stretches out at post-cast groove mouth position (the ordinary reinforcing bar in the figure), waits to be connected with the vertical ordinary reinforcing bar that adjacent precast beam reserved post-cast groove mouth stretches out behind the frame roof beam. The edge of the adjacent end of the edge hole beam concrete beam 1 and the middle hole beam is provided with an edge hole beam simply-supported continuous longitudinal prestressed tendon 3, and the end part of the edge hole beam simply-supported continuous longitudinal prestressed tendon 3 is provided with a reserved tensioning groove for tensioning the prestressed tendon. When the edge hole beam is prefabricated, only a prestressed tendon pore channel is reserved for the edge hole beam simple-support continuous longitudinal prestressed tendon 3, and after concrete 13 is erected and poured (and the required strength is achieved), the simple-support continuous longitudinal prestressed tendon 3 penetrates into the reserved prestressed tendon pore channel and is tensioned. The number, the line shape and the arrangement position of the prestressed tendons of the edge hole beam simply supported variable continuous longitudinal prestressed tendon 3 are calculated and determined according to the structural stress requirement, and the positions and the line shapes in the figure are only schematic. The edge hole beam concrete beam 1 is simply supported firstly and then is provided with an edge hole beam permanent support 4 at the lower edge of the outermost end (the outermost end of the 1 st hole beam and the outermost end of the 1 st hole beam) of the continuous beam, and an edge hole beam temporary support 5 is arranged at the lower edge of one end adjacent to the middle hole beam.
As shown in fig. 3, 7 and 8, the middle hole beam concrete beam 6 is a rectangular cross-section structure, two sides of the top surface of the middle hole beam concrete beam 6 extend outwards to form a wing plate structure, the transverse width of the top surface of the side hole beam concrete beam 1 is increased, a double-track structure is convenient to arrange on the middle hole beam concrete beam, the cross-section size of the middle hole beam concrete beam 6 is matched with that of the side hole beam concrete beam 1 (including concrete main longitudinal beams and internal common steel bars thereof, without prestressed tendons, without cross braces or transverse connection structures between two adjacent main longitudinal beams), the middle hole beam longitudinal prestressed tendons 7 are arranged in the middle hole beam concrete beam 6 according to the stress requirement, the prestress generated by the middle hole beam longitudinal prestressed tendons 7 is used for balancing the tension of the lower edge of the concrete beam generated by the dead weight of the bridge (the dead weight when a simple supported beam structure system is prefabricated), and is also used for balancing the tension of the lower edge of the concrete beam, after the tensile stress is balanced, the prestress generated by the longitudinal prestressed tendon 7 of the middle hole beam also needs to reserve a certain compressive stress reserve at the lower edge of the concrete beam. The number, the line shape and the arrangement position of the prestressed tendons of the middle hole beam longitudinal prestressed tendon 7 are calculated and determined according to the structural stress requirement, the positions and the line shapes in the drawing are only schematic, the middle hole beam longitudinal prestressed tendon 7 is preferably a linear structure with a plurality of dispersed upwarping at two ends and parallel and concentrated middle.
Reserved post-cast groove openings are formed in two ends of the middle hole beam concrete beam 6 and used for pouring simple support-to-continuous post-cast concrete 13, longitudinal common steel bars of the concrete beam extend out of the post-cast groove openings (common steel bars in the drawing), and the longitudinal common steel bars extending out of the post-cast groove openings of the adjacent precast beams are connected after the beam is erected. The upper edges of two ends of the middle hole beam concrete beam 6 are provided with a middle hole beam simple support variable continuous longitudinal prestressed tendon 8, and the end part of the middle hole beam simple support variable continuous longitudinal prestressed tendon 8 is provided with a reserved tensioning groove for tensioning the prestressed tendon. When the middle hole beam is prefabricated, only the prestressed tendon pore channel is reserved, and after concrete 13 is erected and poured (and the required strength is reached), the simply supported continuous longitudinal prestressed tendon 8 penetrates into the reserved prestressed tendon pore channel and is tensioned. The number, the line shape and the arrangement position of the prestressed tendons of the simply supported continuous longitudinal prestressed tendon 8 of the middle hole beam are calculated and determined according to the structural stress requirement, and the position and the line shape in the figure are only schematic.
Furthermore, the middle hole beam simply supported variable continuous longitudinal prestressed tendon 8 and the edge hole beam simply supported variable continuous longitudinal prestressed tendon 3 adopt the same prestressed tendon at the adjacent position of the edge hole beam and the middle hole beam, and between the two adjacent middle hole beams, the middle hole beam simply supported variable continuous longitudinal prestressed tendon 8 and the edge hole beam simply supported variable continuous longitudinal prestressed tendon 3 can adopt the same prestressed tendon or different prestressed tendons. The middle hole beam concrete beam 6 is simply supported firstly and then the lower edges of the two ends of the continuous beam are provided with middle hole beam permanent supports 11.
As shown in fig. 9 to 16, the construction method of the medium-low speed magnetic levitation simply supported and then continuous beam is as follows (in the construction step diagrams, the line shape is not shown when the prestressed tendons are not tensioned, the line shape is shown only when the prestressed tendons are tensioned, and in addition, the simply supported and continuously poured concrete 13 is only shown at the end of the pouring stage, and the position is not independently shown after the simply supported and continuously poured concrete 13 is combined with the precast concrete before and after pouring):
(1) as shown in fig. 9 and 13, the construction of the bridge foundation and the abutment is completed first, during the construction of the bridge foundation and the abutment, the prefabrication work of the edge hole beam and the middle hole beam of the simply supported continuous beam is performed and maintained at the same time, then the temporary support and the permanent support are installed at the corresponding positions of the edge hole beam and the middle hole beam, and finally the edge hole beam and the middle hole beam are erected at the corresponding positions of the pier;
(2) as shown in fig. 10 and 14, a template and a permanent support 11 are installed at the position of a post-cast groove opening reserved in two adjacent hole precast beams, a prestressed tendon pipeline is connected, longitudinal steel bars of the two hole beams are connected, other steel bars are bound, post-cast groove opening concrete is poured and maintained;
(3) as shown in fig. 11 and 15, after the strength of the concrete at the post-pouring trough mouth meets the strength requirement, penetrating the simply supported continuous longitudinal prestressed tendons of each hole beam into the reserved prestressed tendon pipelines, tensioning the prestressed tendons, grouting and sealing the anchors;
(4) after the grouting reaches the strength requirement, the temporary support at each pier top is removed and the support reaction force is transferred to the permanent support, as shown in fig. 12 and 16. And then constructing a track structure and other related facilities on the bridge.
The utility model discloses a well low-speed magnetism floats two-wire simple earlier whole hole big box girder in succession after, changes well low-speed magnetism to float conventional standard span bridge construction of traffic into the simple beam in succession after earlier simple by the simple beam, under equal bridge structures warp the limit value standard, the beam height of the continuous beam in earlier simple back can be lower than the simple beam to can reduce the engineering investment.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (7)
1. The utility model provides a well low-speed magnetism floats big case roof beam of continuous whole hole in earlier letter back of double-line, locates on bridge pier (12), its characterized in that includes:
the two sides of the top surface of the side hole beam and the middle hole beam extend outwards to form a bridge wing plate so as to increase the transverse width of the top section of the beam and facilitate laying and erecting a double-line track;
the side hole beam comprises a side hole beam concrete beam (1), and a side hole beam simply supported variable continuous longitudinal prestressed rib (3) is arranged on the upper edge of one end, adjacent to the middle hole beam, of the side hole beam concrete beam (1);
the middle hole beam comprises a middle hole beam concrete beam (6), and middle hole beam simply supported variable continuous longitudinal prestressed tendons (8) are arranged on the upper edges of two ends of the middle hole beam concrete beam (6);
the end parts of the edge hole beam simply supported variable continuous longitudinal prestressed tendon (3) and the middle hole beam simply supported variable continuous longitudinal prestressed tendon (8) are provided with reserved tensioning grooves for tensioning prestressed reinforcements, and the edge hole beam and the middle hole beam are connected into a whole to jointly form a large box beam which is simply supported and then continuously whole.
2. The medium-low speed magnetic levitation double-line simply-supported and then continuously-integrated hole large box girder according to claim 1, characterized in that a longitudinal prestressed rib (2) of the edge hole beam is arranged in the edge hole beam concrete beam (1) according to the stress requirement;
the longitudinal prestressed tendons (2) of the side hole beams are multiple and are of a linear structure with two ends being scattered and upwarped and the middle being parallel and concentrated.
3. The medium-low speed magnetic levitation double-line simply-supported and then continuously-whole-hole large box girder according to claim 1, characterized in that a middle hole beam longitudinal prestressed tendon (7) is arranged in the middle hole beam concrete beam (6) according to the stress requirement;
the middle hole beam longitudinal prestressed tendons (7) are multiple and are of a linear structure with two ends being scattered and upwarped and the middle being parallel and concentrated.
4. The medium-low speed magnetic levitation double-line simply-supported and then continuously-integrated large box girder according to any one of claims 1-3, characterized in that one end of the edge hole beam concrete beam (1) is in butt joint with the middle hole beam concrete beam (6), and two ends of the middle hole beam concrete beam (6) are respectively provided with a reserved post-cast notch.
5. The medium-low speed magnetic levitation double-line simply-supported and then continuously-punched big box girder according to any one of claims 1-3, characterized in that one end of the side hole girder is provided with a side hole girder temporary support (5), and the other end is provided with a side hole girder permanent support (4);
the two ends of the middle hole beam concrete beam (6) are respectively provided with a middle hole beam temporary support (9);
the end parts of the middle hole beams are butted through the middle hole beam temporary supports (9), the middle hole beams are butted with the side hole beams through the side hole beam temporary supports (5), and concrete (13) is poured at the reserved post-pouring groove opening.
6. The medium-low speed magnetic levitation double-line simply-supported and then continuously-holing large box girder according to any one of claims 1-3, characterized in that the middle hole girder simply-supported continuous longitudinal prestressed tendons (8) and the side hole girder simply-supported continuous longitudinal prestressed tendons (3) adopt the same prestressed tendons at the positions adjacent to the middle hole girder;
between two adjacent middle hole beams, the middle hole beam simply supported continuous longitudinal prestressed tendons (8) and the side hole beam simply supported continuous longitudinal prestressed tendons (3) adopt the same prestressed tendons or different prestressed tendons.
7. The medium-low speed magnetic levitation double-line simply-supported and then continuously-integrated large box girder according to any one of claims 1-3, characterized in that one end of the edge hole beam concrete beam (1) is in butt joint with the middle hole beam concrete beam (6), and two ends of the middle hole beam concrete beam (6) are respectively provided with a reserved post-cast notch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920607774.9U CN210596965U (en) | 2019-04-29 | 2019-04-29 | Medium-low speed magnetic levitation double-line continuous whole-hole big box girder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920607774.9U CN210596965U (en) | 2019-04-29 | 2019-04-29 | Medium-low speed magnetic levitation double-line continuous whole-hole big box girder |
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| CN210596965U true CN210596965U (en) | 2020-05-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029566A (en) * | 2019-04-29 | 2019-07-19 | 中铁磁浮交通投资建设有限公司 | A kind of big box beam in the whole hole of medium-and low-speed maglev two-wire simple-supported thencontinuous and construction method |
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2019
- 2019-04-29 CN CN201920607774.9U patent/CN210596965U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029566A (en) * | 2019-04-29 | 2019-07-19 | 中铁磁浮交通投资建设有限公司 | A kind of big box beam in the whole hole of medium-and low-speed maglev two-wire simple-supported thencontinuous and construction method |
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