CN111764302A - Concrete pouring construction method under large-diameter flat hinge of swivel bridge - Google Patents
Concrete pouring construction method under large-diameter flat hinge of swivel bridge Download PDFInfo
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- CN111764302A CN111764302A CN201910260477.6A CN201910260477A CN111764302A CN 111764302 A CN111764302 A CN 111764302A CN 201910260477 A CN201910260477 A CN 201910260477A CN 111764302 A CN111764302 A CN 111764302A
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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
- E01D21/08—Methods or apparatus specially adapted for erecting or assembling bridges by rotational movement of the bridge or bridge sections
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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
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Abstract
The invention discloses a swivel bridge large-diameter flat hinge lower concrete pouring construction method, wherein a lower flat hinge disc and an installation part thereof are structurally characterized by comprising a swivel base bearing platform, a bearing platform preformed groove, a flat hinge support and a lower flat hinge disc; the top surface of the lower flat capstan is a concave spherical surface, and the bottom surface of the lower flat capstan is a plane and is welded with a support plate; the lower flat hinge plate is provided with a vibrating hole and an exhaust hole, the diameter of the lower flat hinge plate is 5.5-6.5 m, and a plurality of preformed holes which are uniformly distributed in the circumferential direction are processed on a steel plate on the periphery of the supporting plate; the construction method comprises the following steps: cleaning reserved notches of the bearing platform, installing a lower flat hinged disc, embedding stress strain gauges, pouring self-compacting concrete of the lower flat hinged disc C60 and arranging reserved grouting pore passages, and performing pressure injection on epoxy resin slurry below the lower flat hinged disc. The method is suitable for pouring concrete under the large-diameter flat hinge of the super-tonnage swivel bridge, improves the concrete compactness of the lower surface of the flat hinge, improves the construction quality, and ensures that the flat hinge is uniformly stressed in the swivel bridge construction process and the swivel process is safe.
Description
Technical Field
The invention relates to a bridge construction method, in particular to a construction method for improving the concrete compactness of a super-heavy swivel bridge under a large-diameter flat hinge.
Background
The turning technology that the bridge construction adopted is more and more mature, and the tonnage of turning also is more and more heavy, and the pivot diameter is also more and more big, and in order to realize the more turning of big tonnage, the pivot level is turned and is moved and born in turn.
The bottom surface of the swivel flat hinge structure is a horizontal plane, the concrete cannot generate lateral height difference on the bottom surface of the flat hinge in the concrete pouring process, the larger the diameter of the flat hinge is, the more difficult the air bubbles between the concrete and the bottom surface of the flat hinge are to be discharged, and the compactness cannot meet the requirement. In addition, the bottom of the flat hinge is usually provided with a supporting steel plate, and the existence of the supporting steel plate also enables air bubbles between the concrete and the bottom surface of the flat hinge to be difficult to discharge.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a construction method for pouring concrete under a large-diameter flat hinge, so that the concrete compactness of the lower surface of the flat hinge is improved, the uniform stress of the flat hinge in the construction process of a swivel bridge is ensured, and the construction quality is ensured.
In order to solve the technical problem, the invention provides a swivel bridge large-diameter flat hinge lower concrete pouring construction method, wherein the related lower flat hinge plate and the installation part thereof are structurally characterized by comprising a swivel base bearing platform, a bearing platform preformed groove, a flat hinge support and a lower flat hinge plate; the lower flat winch is a round steel plate, the top surface of the round steel plate is a concave spherical surface, and the bottom surface of the lower flat winch is a plane; the bottom surface of the lower flat winch is welded with a plurality of radial rib plates and a plurality of circles of circumferential rib plates, the radial rib plates are intersected with the circumferential rib plates, a circle of supporting steel ring connected with the radial rib plates is welded at the outer edge of the bottom surface of the lower flat winch, the diameter of the supporting steel ring is smaller than that of the lower flat winch, the lower flat winch is provided with a plurality of vibrating holes and exhaust holes which are communicated up and down, the diameter of the lower flat winch is 5.5-6.5 m, and a plurality of preformed holes which are uniformly distributed in the circumferential direction are processed on the supporting steel ring; the construction method for pouring the concrete under the large-diameter flat hinge of the swivel bridge comprises the following steps:
step one, cleaning reserved notches of bearing platforms: after the swivel foundation bearing platform is poured according to a drawing, accurately lofting and checking a reserved groove of the bearing platform by using a total station, and processing places which do not meet design requirements; then, performing chiseling treatment on the concrete surface in the reserved groove of the bearing platform; finally, removing slag and cement slurry on pre-buried steel bars in the notch of the reserved slot of the bearing platform and the notch;
step two, mounting a lower flat capstan: checking the surface ovality and structure of the lower flat hinged disk transported to the site, hoisting the lower flat hinged disk to a flat hinged support by using a hoisting machine after the requirements are met, and horizontally placing the lower flat hinged disk; the process requirements of installation are as follows:
(1) the relative height errors of any two points on the edge of the top surface of the lower flat capstan are not more than 1mm, and the electronic level is repeatedly used for calibration in the whole installation process;
(2) the horizontal hinge rotation center of the lower horizontal hinge plate is positioned at a design position, and the vertical and horizontal errors of the horizontal hinge rotation center are less than or equal to 1 mm;
after the two requirements are met, the lower flat hinge plate is fixed with the flat hinge support;
step three, embedding the stress strain gauge: burying stress strain gauges in the bottom surface of the lower flat winch and concrete poured by the lower flat winch, and monitoring the stress strain conditions of concrete and the lower flat winch at each construction stage;
step four, lower flat hinge plate concrete pouring and arrangement of reserved grouting pore channels: grouting pipes are welded at a plurality of reserved holes uniformly distributed in the circumferential direction of the support steel ring, a steel strand penetrates through each grouting pipe, one end of each steel strand reaches the central part of the lower flat winch, and the other end of each steel strand extends out of each grouting pipe; c60 self-compacting concrete is poured between the bearing platform preformed groove and the lower flat hinge plate; after the concrete is initially set, drawing out the steel strand penetrating through each grouting pipe, thereby forming grouting pore channels;
step five, injecting epoxy resin slurry under the lower flat capstan: and after pouring concrete between the bearing platform preformed groove and the lower flat hinge plate for 2-3 days, pressure-casting epoxy resin slurry into each grouting pore channel, and stopping pressure-casting the epoxy resin slurry when the epoxy resin slurry overflows from the periphery of the lower flat hinge plate.
According to the construction method for pouring the concrete under the large-diameter flat hinge of the swivel bridge, the support steel ring is further provided with the lightening hole.
Compared with the prior art, the construction method has the advantages that:
in the prior art, only a construction method of pouring common C60 concrete is adopted, and the concrete on the bottom surface of the lower flat hinge is not compact and has more bubbles. According to the construction method, the condition that the concrete on the bottom surface of the lower flat hinge is not compact and more bubbles are generated is improved by changing the poured C60 concrete into the C60 self-compacting concrete, and meanwhile, the epoxy resin grout is injected to the bottom of the lower flat hinge plate in a pressing mode to further remove the bubbles and ensure that the C60 self-compacting concrete and the lower flat hinge plate are compact. By utilizing the construction method provided by the invention, the construction method comprises the following steps of 1: 1, simulating a pouring experiment by using a lower flat hinge model, and observing the quantity and distribution density of bubbles on the contact surface of the concrete by destroying and removing the lower flat hinge model after the concrete reaches 100% strength. The observation results show that: by adopting the construction method provided by the invention, the concrete compactness at the bottom of the flat capstan is greatly improved, and bubbles are few; the construction method can meet the design requirements, and is simple to operate and reliable in effect.
Drawings
FIG. 1 is a bottom view of a large diameter lower flat capstan for a swivel bridge in accordance with the present invention;
FIG. 2 is a schematic construction view of a large-diameter lower flat capstan for a swivel bridge according to the present invention;
FIG. 3 is a bottom view of the large-diameter flat hinge construction of the swivel bridge of the present invention;
fig. 4 is a side view of the large diameter lower flat capstan of the swivel bridge of the present invention.
In the figure: 1-lower flat hinged disc, 2-vibrating hole, 3-exhaust hole, 4-supporting steel ring, 5-bearing platform preformed groove, 6-grouting pipe, 7-swivel base bearing platform, 8-steel strand, 9-pin shaft sleeve, 10-flat hinged support and 11-preformed hole.
The specific implementation mode is as follows:
the casting method according to the present invention is further described in detail below with reference to the accompanying drawings and the embodiments.
The invention provides a construction method for pouring concrete under a large-diameter flat hinge of a swivel bridge, wherein the related structures of a lower flat hinge plate and an installation part thereof are shown in figures 1 and 2, and the construction method comprises a swivel base bearing platform 7, a bearing platform preformed groove 5, a flat hinge support 10 and the lower flat hinge plate 1; the lower flat winch 1 is a circular steel plate, the top surface of the circular steel plate is a concave spherical surface, the bottom surface of the lower flat winch 1 is a plane, a plurality of radial rib plates and a plurality of circles of circumferential rib plates are welded on the bottom surface of the lower flat winch 1, the radial rib plates and the circumferential rib plates are intersected, a circle of support steel ring 4 connected with the radial rib plates is welded on the outer edge of the bottom surface of the lower flat winch 1, the diameter of the support steel ring 4 is smaller than that of the lower flat winch 1, the support steel ring 4, the radial rib plates and the circumferential rib plates are parallel and level, namely, a support plate of the lower flat winch is formed by the support steel ring 4, the radial rib plates and the circumferential rib plates, the lower flat winch 1 is provided with a plurality of vibrating holes 2 and exhaust holes 3 which are communicated up and down, the diameter of the lower flat winch 1 is 5.5 m-6.5 m, as shown in figures 3 and 4, a plurality of preformed holes 11 which are uniformly distributed in the circumferential direction are machined on the support steel ring, and a lightening hole can be arranged on the support steel ring 4 under the condition of meeting the requirements of strength and rigidity.
As shown in fig. 2 and 3, the construction method for pouring the large-diameter flat hinged concrete of the swivel bridge comprises the following steps:
step one, cleaning reserved notches of bearing platforms:
after the swivel foundation bearing platform 7 is poured according to a drawing, firstly, a total station is adopted to accurately loft and check the bearing platform preformed groove 5, and places which do not meet the design requirements are processed; then, performing chiseling treatment on the concrete surface in the bearing platform reserved groove 5; finally, the slag and the cement paste on the pre-buried steel bars in the notch of the reserved slot 5 of the bearing platform are removed,
step two, mounting a lower flat capstan 1:
checking the surface ovality and the structure of the lower flat winch 1 transported to the site, and hoisting the lower flat winch 1 in place by adopting two 400t cranes after the requirements are met, wherein the mounting top opening is necessarily horizontal; after the lower flat hinge tray 1 is installed, the rotation center of the flat hinge of the lower flat hinge tray 1 is located at a designed position, the longitudinal and transverse deviation of the flat hinge is less than or equal to 1.0mm, and the relative height difference around the flat hinge is 0.9mm, that is, the relative height error between any two points of the top surface edge of the lower flat hinge tray 1 is no more than 1mm, the whole installation process needs to be repeatedly calibrated by using an electronic level, and the lower flat hinge tray 1 and the bracket 10 are fixed and locked in time after the correct position is ensured, as shown in fig. 2.
Step three, embedding the stress strain gauge:
and burying stress strain gauges at the bottom surface of the support plate at the bottom surface of the lower flat hinge plate 1 and the position of concrete poured by the lower flat hinge plate by a third-party monitoring unit so as to monitor the stress strain conditions of concrete and steel plates of the lower flat hinge plate at each stage of construction.
Step four, pouring concrete of the lower flat winch 1 and laying reserved grouting channels:
grouting pipes are welded to a plurality of preformed holes 11 evenly distributed in the circumferential direction of the support steel ring 4, as shown in fig. 2 and 3, a steel strand 8 penetrates through each grouting pipe, one end of each steel strand 8 reaches the central part of the lower flat winch 1, and the other end of each steel strand 8 extends out of each grouting pipe.
The environmental temperature is closely monitored before the concrete of the lower flat capstan 1 is poured, the environmental temperature is selected to be 20-25 ℃, and C60 self-compacting concrete is adopted for pouring, the environmental temperature range not only ensures that the concrete has enough fluidity, but also prevents poor fluidity of the concrete and concrete shrinkage caused by overhigh environmental temperature. The vibrating rod penetrates through the vibrating hole 3 to vibrate, and gas between the concrete and the lower flat rubber plate 1 is discharged through the exhaust hole 3.
After the concrete is initially set, the steel strand 8 penetrating through each grouting pipe is drawn out, so that grouting pore passages are formed;
step five, injecting epoxy resin slurry under the lower flat capstan 1:
and after pouring concrete between the bearing platform preformed groove 5 and the lower flat hinged disc 1 for 2-3 days, pressure-casting epoxy resin slurry into each grouting pore channel, and stopping pressure-casting the epoxy resin slurry when the epoxy resin slurry overflows from the periphery of the lower flat hinged disc 1. The epoxy resin slurry is injected through a gap with a width larger than 0.1mm, and in addition, the setting time and the 28d strength of the epoxy resin slurry can be controlled by adjusting the mixing ratio of the components of the epoxy resin slurry, which can be obtained by limited times of experiments by a person skilled in the art, and the details are not repeated. Because the diameter of the lower flat capstan is large and the bottom area is large, the setting time of the epoxy resin slurry is determined to be 12 hours, the 7d strength is not lower than 50MPa, and the pressure during injection is controlled to be 0.2-0.6 MPa. After the epoxy resin slurry is injected, the strength of the remained test block 7d reaches 55Mpa, the concrete pouring construction under the flat hinge is fully finished, and the pouring quality is well controlled.
Test materials:
the Lekeda street south extension project located in the southwest of the Baoding city strides over the railway at an intersection angle of about 61.8 degrees on a Beijing broad line K137+970 (Baoding south station), and the railway strides over 21 tracks from north to south. The main bridge adopts a (145+240+110) m-span continuous primary-secondary tower single-cable-plane prestressed concrete cable-stayed bridge, the total length is 495m, oblique crossing is performed, and bidirectional plane rotation and middle closure construction are performed. The bridge of the mother tower rotor has cantilever length (128.6+135) m rotor weight 46000t and rotates 52.4 degrees counterclockwise. The cantilever length of the sub-tower swivel bridge is 2 multiplied by 102m, the swivel weight is 35000t, and the counter-clockwise swivel is 67.4 degrees. The bridge of the main tower and the sub-tower swivel respectively adopts 500000KN and 400000KN level flat hinges, the numbers of the flat hinges are ZTPJ-V-500000 and ZTPJ-III-400000, the diameter of the main tower swivel flat hinge reaches 6.48m, and the diameter of the sub-tower swivel flat hinge reaches 5.88 m. In order to ensure the construction quality and the stability of the turning process, the construction scheme combining the C60 self-compacting concrete and the epoxy resin slurry provided by the invention is adopted, so that the compactness of the concrete under the lower flat hinge is ensured, the construction quality is improved, the safety of the turning process is ensured, and the operation is easy.
The method is suitable for pouring concrete under the large-diameter flat hinge of the super-tonnage swivel bridge, improves the concrete compactness of the lower surface of the flat hinge, ensures that the flat hinge is uniformly stressed in the construction process of the swivel bridge, and ensures the construction quality.
Although the disclosed construction method involving the large diameter flat hinged concrete of swivel bridges has been described with particular reference to the embodiments, the above described embodiments are illustrative and not intended to be limiting, and all changes and modifications that come within the spirit and scope of the invention are desired to be protected.
Claims (2)
1. A swivel bridge large-diameter flat hinge lower concrete pouring construction method comprises a swivel base bearing platform (7), a bearing platform preformed groove (5), a flat hinge support (10) and a lower flat hinge disc (1); the lower flat winch (1) is a round steel plate, the top surface of the round steel plate is a concave spherical surface, and the bottom surface of the lower flat winch (1) is a plane; the welding has a plurality of radial ribs and many rings of circumference rib on the bottom surface of flat capstan (1) down, radial rib and circumference rib are crossing, the support steel ring (4) that bottom surface outward flange department welding round and radial rib are connected of flat capstan (1) down, the diameter of supporting steel ring (4) is less than the diameter of flat capstan (1) down, flat capstan (1) is equipped with a plurality of holes of vibrating (2) and exhaust hole (3) that link up from top to bottom down, its characterized in that:
the diameter of the lower flat capstan (1) is 5.5-6.5 m, and a plurality of preformed holes (11) which are uniformly distributed in the circumferential direction are processed on the support steel ring (4); the construction method for pouring the concrete under the large-diameter flat hinge of the swivel bridge comprises the following steps:
step one, cleaning reserved notches of bearing platforms: after the swivel foundation bearing platform (7) is poured according to a drawing, a total station instrument is adopted to accurately loft and check the bearing platform preformed groove (5) and process places which do not meet design requirements; then, performing chiseling treatment on the concrete surface in the bearing platform reserved groove (5); finally, removing slag and cement slurry on embedded steel bars in the notch of the cushion cap preformed groove (5) and the notch;
step two, installing a lower flat capstan (1): checking the surface ovality and the structure of the lower flat winch (1) transported to the site, hoisting the lower flat winch (1) to a flat hinge support (10) by using a hoisting machine after the requirements are met, and horizontally placing the lower flat winch; the process requirements of installation are as follows:
the relative height errors of any two points of the edge of the top surface of the lower flat capstan (1) are not more than 1mm, and the electronic level is repeatedly used for calibration in the whole installation process;
the horizontal hinge rotation center of the lower horizontal hinge plate (1) is positioned at a design position, and the vertical and horizontal errors of the horizontal hinge rotation center are less than or equal to 1 mm;
after the two requirements are met, the lower flat hinge plate (1) is fixed with the flat hinge support (10);
step three, embedding the stress strain gauge: burying stress strain gauges in the bottom surface of the lower flat winch (1) and concrete poured by the lower flat winch, and monitoring the stress strain conditions of concrete and the lower flat winch (1) at each construction stage;
step four, pouring concrete in the lower flat capstan (1) and laying reserved grouting channels: grouting pipes are welded at a plurality of preformed holes (11) which are uniformly distributed in the circumferential direction of the support steel ring (4), a steel strand (8) penetrates through each grouting pipe, one end of each steel strand (8) reaches the central part of the lower flat winch (1), and the other end of each steel strand (8) extends out of each grouting pipe; c60 self-compacting concrete is poured between the bearing platform preformed groove (5) and the lower flat capstan (1); after the concrete is initially set, drawing out the steel strand (8) penetrating through each grouting pipe, thereby forming grouting pore canals;
step five, injecting epoxy resin slurry under the lower flat capstan (1): and after the concrete between the bearing platform preformed groove (5) and the lower flat capstan (1) is poured for 2-3 days, pressure-casting epoxy resin slurry into each grouting pore channel, and stopping pressure-casting the epoxy resin slurry when the epoxy resin slurry overflows on the periphery of the lower flat capstan (1).
2. The swivel bridge large-diameter flat-hinged concrete pouring construction method according to claim 1, wherein a lightening hole is further formed in the support steel ring (4).
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| CN201910260477.6A CN111764302A (en) | 2019-04-02 | 2019-04-02 | Concrete pouring construction method under large-diameter flat hinge of swivel bridge |
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| CN201910260477.6A CN111764302A (en) | 2019-04-02 | 2019-04-02 | Concrete pouring construction method under large-diameter flat hinge of swivel bridge |
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Application publication date: 20201013 |