CN112709143B - Cast-in-place inclined leg rigid frame bridge disc buckle type full-space support and template construction method - Google Patents
Cast-in-place inclined leg rigid frame bridge disc buckle type full-space support and template construction method Download PDFInfo
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- CN112709143B CN112709143B CN202011547939.1A CN202011547939A CN112709143B CN 112709143 B CN112709143 B CN 112709143B CN 202011547939 A CN202011547939 A CN 202011547939A CN 112709143 B CN112709143 B CN 112709143B
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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Abstract
The invention provides a cast-in-place inclined leg rigid frame bridge disc buckle type full framing and a formwork construction method, wherein the construction method comprises the following steps: s1, cofferdam diversion and foundation treatment; s2, erecting a bracket; s3, pouring the inclined leg template reinforced concrete; s4, pouring the reinforced concrete of the main beam template; s5, removing the template and the bracket. The method and the structure provided by the invention are reasonable in arrangement, and the safety in the pouring process of the inclined leg rigid frame bridge can be improved.
Description
Technical Field
The invention relates to the technical field of slant leg rigid frame bridges, in particular to a cast-in-place slant leg rigid frame bridge disc buckle type full framing and a formwork construction method.
Background
The slant leg rigid frame bridge is as striding a river, striding a road a kind of direct connection bridge, generally adopts fastener, bowl to detain full hall support and combines the steel pipe to support the method construction, because the fastener support, the bowl detain reasons such as the non-standardization and the acceptance degree of difficulty of support market are great at present, especially the fastener support leads to the support accident to send out more, and dish detains support security and overall structure stability better solution similar problem.
Although the common full-hall bracket method of the steel bridge with the inclined legs is adopted, the bracket at the position of the inclined legs is erected with a plurality of flowers and eight doors in the construction process, so that the stress characteristic of a bracket system is not clear, and the potential safety hazard is high; the inclined legs are mainly made of steel dies, cost is high, and for most full-hall supports, different strength designs are adopted for support systems to achieve the purpose of cost control due to different loads.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a cast-in-place inclined leg rigid frame bridge disc buckle type full framing and a formwork construction method, so as to improve the safety of an inclined leg rigid frame bridge in the pouring process.
The invention provides a cast-in-place inclined leg rigid frame bridge disc buckle type full framing and a formwork construction method, wherein the construction method comprises the following steps:
s1, cofferdam diversion and foundation treatment;
s2, erecting a bracket; erecting inclined leg brackets on the foundation, and arranging normal supports between every two inclined leg brackets; erecting a slant leg portal frame on the foundation; erecting a main beam middle support on the foundation; erecting main beam side supports on platforms on two sides of the foundation;
s3, pouring the inclined leg template reinforced concrete; arranging an inclined leg steel bar formwork on the inclined leg support, arranging an inclined leg wood formwork outside the inclined leg steel bar formwork, and pouring reinforced concrete in the inclined leg wood formwork;
s4, pouring the reinforced concrete of the main beam template; arranging girder steel bar formworks on the girder middle support and the girder side support, arranging girder wood formworks outside the girder steel bar formworks, and pouring reinforced concrete in the girder wood formworks;
s5, removing the template and the bracket.
Preferably, in the step S1, in the cofferdam diversion, straw bags are used for cofferdam; in the foundation treatment, 5% of cement soil and ballast are adopted for carrying out layered backfill, the bearing capacity is checked after the backfill, a broken stone cushion layer is adopted for filling after the check is finished, and C25 reinforced concrete is hardened and reinforced.
Preferably, in S2, the inclined leg bracket is erected in a front 60 × 30 manner and a middle rear 60 × 60 manner; the erecting mode of the main beam middle support is a 90 x 90 mode, and a fastener type cross brace is arranged on the main beam middle support; the erection mode of the side bracket of the main beam is a 60 multiplied by 60 mode.
Preferably, in S2, the normal support is reinforced with a steel pipe of a fastener type.
Preferably, in S2, the slant-leg portal frame is a section steel welded portal frame, and a steel pipe support is erected on the upper portion of the slant-leg portal frame in a 60 × 60 mode.
Preferably, in S2, after the scaffold is completely erected, preloading is performed, wherein the preloading is performed by step loading, the deformation of the scaffold is observed through an observation point arranged at the top of the scaffold, a curve graph of the change of the settlement amount with time is drawn through settlement observation, after the pressure-weight precast block is removed, the scaffold is evaluated, and the scaffold is put into use after the qualification is confirmed.
Preferably, in S3, the inclined leg wooden template and the inclined leg bracket are padded by wedge-shaped wooden wedges.
Preferably, in S4, a plurality of cloth and vibration windows are opened on the main beam wooden formwork along the transverse direction.
Preferably, in S5, the form and the support are removed according to the design requirement, the side forms are removed before the pre-stress tension, the bottom form is removed after the pre-stress is built in the structure, and the form and the support are sorted and stored after the removal.
Compared with the prior art, the invention has the following beneficial effects:
1. the method and the structure provided by the invention are reasonable in arrangement, and the safety in the pouring process of the inclined leg rigid frame bridge can be improved.
2. The traditional inclined leg adopts a steel template mode, so that the cost is greatly reduced.
3. The invention adopts the combination of the disc buckle bracket and the common steel bracket, thereby greatly improving the safety and reliability.
4. According to the invention, the oblique leg position template treatment and the oblique leg windowing mode ensure that the oblique legs are completed safely and reliably and the concrete pouring quality is ensured.
5. The inclined leg portal frame processing mode is simple and reliable, simple to operate and stable in stress structure.
6. The invention has the advantages of simple structure, convenient material taking, simple processing, reutilization and convenient operation during construction.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a front view of an embodiment of the present invention.
Fig. 2 is a side view of an embodiment of the present invention.
Wherein, 1, foundation; 2. a diagonal leg support; 3. normal supporting; 4. a slant leg portal; 5. a main beam middle support; 6. a main beam side support; 7. distributing and vibrating the window.
Detailed Description
The following examples are provided to better understand the present invention, not to limit the present invention to the best mode, and not to limit the content and the protection scope of the present invention, and any similar or similar schemes obtained by combining the present invention with other prior art features or the present invention will fall within the protection scope of the present invention.
Examples
A cast-in-place inclined leg rigid frame bridge disc buckle type full framing and formwork construction method is disclosed, referring to FIGS. 1-2, the construction method comprises the following steps:
s1, 1) cofferdam flow guiding: the method comprises the following steps of constructing an island in a river channel by adopting straw bag cofferdams, avoiding polluting the river channel, burying two DN1500 reinforced concrete plain end pipes as diversion communicating pipes at two sides of the river channel, enabling pipe tops to be 30cm below a concrete cushion layer, enabling the length of one diversion communicating pipe to be larger than the bridge width, considering the requirements of a working surface and a transportation road, and reinforcing the pipe tops by C30 reinforced concrete according to the buried depth of the pipe tops and soil covering of less than 70 cm;
2) foundation treatment: dredging river bottoms within the range of 7m on the projection plane of the bridge plus the south and north sides, and backfilling by layers by adopting cement soil with the thickness of 132cm and the thickness of 5% and road slag with the thickness of 50cm, so that the bearing capacity is prevented from being reduced after later-stage backfilling soil meets water, carrying out bearing capacity inspection after backfilling, and filling by adopting a 10cm broken stone cushion layer after inspection is qualified, and hardening and reinforcing by using 20cm C25 reinforced concrete so as to prevent later-stage soaking in water;
s2, erecting a support; 1) erecting inclined leg supports 2 on a foundation 1, arranging normal supports 3 between every two inclined leg supports 2, reinforcing the normal supports 3 by adopting fastener type steel pipes to increase normal stress, embedding phi 20 steel bars at the contact positions of the normal supports 3 and the ground, embedding 15cm steel bars, exposing 5cm steel bars, and inserting the embedded steel bars into the normal supports 3 to prevent stress sliding; the inclined leg bracket 2 is a phi 48 multiplied by 3.2mm disk buckle type steel pipe, the vertical length of the front vertical rod is 60cm, the horizontal length is 30cm, the step distance is 1.0m, the vertical length of the rear vertical rod is 60cm, the horizontal length is 60cm, and the step distance is 1.5 m; wherein, adopt intelligent laying-out: the CAD and even BIM technology is adopted to perform plane and vertical face integral lofting on the field support, so as to simulate the real situation of the field, solve the problems in advance and avoid the phenomena of inconsistency, frequency correction and modification on the field; adopting field lofting: the method of positioning from the inside, inclining the legs firstly and then arranging the two sides is adopted, so that the accuracy and the standard degree of on-site support erection are ensured, and the integral quality of the support erection is ensured;
2) erecting an oblique leg portal frame 4 on the foundation 1, wherein the oblique leg portal frame 4 is formed by welding portal frames through double-spliced 18# channel steel, the distance is 60cm, the oblique leg portal frame 4 is installed in a manner of being tightly attached to an oblique leg, the top of the oblique leg portal frame is welded with a vertical rod, a horizontal rod and a cross brace are adopted for reinforcing and stabilizing, and then a steel pipe support is erected at the upper part of the oblique leg portal frame in a 60 x 60 mode;
3) erecting a main beam middle support 5 on the foundation 1, wherein the support is 90cm in longitudinal direction and 90cm in transverse direction, the step distance is 1.5m, and a fastener type cross brace is arranged on the main beam middle support 5 to ensure the overall stability;
4) erecting main beam side supports 6 on platforms at two sides of the foundation 1, wherein the erecting mode of the main beam side supports 6 is 60 multiplied by 60; after the support is erected, carrying out preloading, wherein the preloading adopts graded loading preloading, the deformation of the support is observed through an observation point arranged at the top of the support, a curve graph of the change of the settlement amount along with time is drawn through settlement observation, after the pressure-weight precast block is removed, the support is evaluated, and the support is put into use after the qualification is confirmed;
s3, pouring the inclined leg template reinforced concrete; arranging a steel bar formwork for the oblique legs on the oblique leg support 2, arranging a wooden formwork for the oblique legs outside the steel bar formwork for the oblique legs, and plugging and padding the wooden formwork for the oblique legs and the oblique leg support 2 by adopting wedge-shaped wood wedges, so that convenience in later dismantling under reasonable stress is ensured, the oblique leg support 2 is inspected in detail, after the whole support is inspected to be qualified initially, reinforced concrete is poured in the wooden formwork for the oblique legs, and the oblique legs at two sides are layered and symmetrically poured; the inclined leg wood formwork is fitted according to the bending radian of the inclined leg steel formwork by adopting a bamboo plywood to ensure the line shape, a steel mould needs to be processed at a position with large upper radian, otherwise the bamboo plywood cannot be bent, so that the construction is ensured; the bottom die at the lower arc part adopts a 15mm bamboo plywood, and 8 multiplied by 8cm battens are adopted in the horizontal direction at an interval of 20 cm; bending the arc section to a designed radian by adopting a common steel pipe with the diameter of 48 multiplied by 2.8mm in the longitudinal direction, and adopting 10# I-steel in the transverse direction, wherein the steel pipe and the I-steel are firmly bound by adopting iron wires; the cross beam is connected with the vertical and oblique steel pipes by jacking, the included angle between the oblique rod and the ground is 45-60 degrees, the bottom of the oblique rod on the foundation is embedded with a rib to prevent the oblique rod from sliding, and a bamboo plywood is laid;
s4, pouring the reinforced concrete of the main beam template; constructing according to a construction scheme and a design drawing, arranging girder steel bar templates on a girder middle bracket 5 and a girder side bracket 6, arranging girder wood templates outside the girder steel bar templates, pouring reinforced concrete in the girder wood templates, pouring the concrete twice, pouring a bottom plate and a top web plate twice, and checking the brackets and the templates in each section of concrete pouring, wherein for the convenience of concrete pouring and vibrating, a plurality of cloth and vibrating windows 7 are transversely arranged on the girder wood templates, 20 multiplied by 20cm windows are arranged at intervals of 1.5m, plugging is carried out when the concrete pouring is close to a reserved window, and the pouring at the next height is continued after the plugging is finished; wherein, the lower panel of the main beam is a 15mm bamboo plywood, the small cross beams are 8 multiplied by 8cm square timber, the transverse bridge direction main beam 10# I-steel, and the distance between the small cross beams is 20 cm;
s5, removing the template and the bracket; and (3) dismantling the template and the support according to design required programs and measures, dismantling the side mold before prestress tensioning, dismantling the bottom mold after prestress is built in the structure, finishing after dismantling, and storing in a classified manner.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (6)
1. A cast-in-place inclined leg rigid frame bridge disc buckle type full framing and formwork construction method is characterized by comprising the following steps:
s1, cofferdam diversion and foundation treatment;
s2, erecting a bracket; erecting inclined leg brackets on the foundation, and arranging normal supports between every two inclined leg brackets; erecting a slant leg portal frame on the foundation; erecting a main beam middle support on the foundation; erecting main beam side supports on platforms on two sides of the foundation; the erection mode of the oblique leg bracket is a front 60X 30 mode, and a middle rear 60X 60 mode; the erecting mode of the main beam middle support is a 90 x 90 mode, and a fastener type cross brace is arranged on the main beam middle support; the erection mode of the side bracket of the main beam is a 60X 60 mode; the normal support is reinforced by a fastener type steel pipe; the inclined leg portal frame is a section steel welding portal frame, and a steel pipe support is erected at the upper part of the inclined leg portal frame in a 60 x 60 mode;
s3, pouring the inclined leg template reinforced concrete; arranging an inclined leg steel bar formwork on the inclined leg support, arranging an inclined leg wood formwork outside the inclined leg steel bar formwork, and pouring reinforced concrete in the inclined leg wood formwork;
s4, pouring the reinforced concrete of the main beam template; arranging girder steel bar formworks on the girder middle support and the girder side support, arranging girder wood formworks outside the girder steel bar formworks, and pouring reinforced concrete in the girder wood formworks;
s5, removing the template and the bracket.
2. The cast-in-place slant leg rigid frame bridge disc buckle type full framing and formwork construction method of claim 1, wherein in S1, in cofferdam diversion, straw bags are used for cofferdam; in the foundation treatment, 5% of cement soil and ballast are adopted for carrying out layered backfill, the bearing capacity is checked after the backfill, a broken stone cushion layer is adopted for filling after the check is finished, and C25 reinforced concrete is hardened and reinforced.
3. The cast-in-place slant leg rigid frame bridge disc buckle type full hall support and the formwork construction method according to claim 1, wherein in S2, after the support is erected, the preloading is carried out, the preloading adopts graded loading preloading, the support deformation is observed through an observation point arranged at the top of the support, a curve graph of the change of the settlement amount along with time is drawn through settlement observation, after the pressure weight precast block is removed, the support is evaluated, and the support is put into use after the qualification is confirmed.
4. The cast-in-place slant-leg rigid-frame bridge disc buckle type full hall support and the template construction method according to claim 1, wherein in S3, a wedge-shaped wood wedge is adopted between the slant-leg wood template and the slant-leg support for padding.
5. The cast-in-place slant-leg rigid frame bridge disc buckle type full hall support and formwork construction method according to claim 1, wherein in S4, a plurality of cloth and vibrating windows are arranged on the main beam wood formwork along the transverse direction.
6. The cast-in-place slant leg rigid frame bridge disc buckle type full hall support and the template construction method according to claim 1, wherein in S5, the template and the support are dismantled according to the design requirement procedures and measures, the side mold is dismantled before the prestress tension, the bottom mold is dismantled after the prestress is built in the structure, and the bottom mold is arranged and classified for storage after the dismantling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011547939.1A CN112709143B (en) | 2020-12-24 | 2020-12-24 | Cast-in-place inclined leg rigid frame bridge disc buckle type full-space support and template construction method |
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| CN202011547939.1A CN112709143B (en) | 2020-12-24 | 2020-12-24 | Cast-in-place inclined leg rigid frame bridge disc buckle type full-space support and template construction method |
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| CN112709143B true CN112709143B (en) | 2022-06-10 |
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| CN114457684A (en) * | 2022-01-24 | 2022-05-10 | 中建五局土木工程有限公司 | Auxiliary bearing formwork supporting structure and construction method for box girder full framing of inclined leg rigid frame bridge |
| CN114737756A (en) * | 2022-04-28 | 2022-07-12 | 中建八局第三建设有限公司 | Construction method of disc buckle early-dismantling support real-time monitoring system |
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| CN204212384U (en) * | 2014-11-11 | 2015-03-18 | 中建八局第一建设有限公司 | A kind of combined type full hall construction bearing support |
| CN108824220A (en) * | 2018-08-08 | 2018-11-16 | 中国建筑第七工程局有限公司 | A kind of cast-in-place support and construction method of the rigid structure of cantilever T-type |
| CN111910520B (en) * | 2020-07-13 | 2021-12-07 | 中铁八局集团第二工程有限公司 | Construction method of high-speed inclined leg crossing rigid frame overpass |
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