CN111188275B - Method for quickly erecting steel-concrete combined temporary bridge spanning existing tunnel U-shaped groove - Google Patents
Method for quickly erecting steel-concrete combined temporary bridge spanning existing tunnel U-shaped groove Download PDFInfo
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- CN111188275B CN111188275B CN202010048657.0A CN202010048657A CN111188275B CN 111188275 B CN111188275 B CN 111188275B CN 202010048657 A CN202010048657 A CN 202010048657A CN 111188275 B CN111188275 B CN 111188275B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a method for quickly erecting a steel-concrete combined temporary bridge spanning an existing tunnel retaining wall, which comprises the following steps: removing the original grating and grating support above the tunnel; installing a vertical column pile, a vertical column and a top joist; excavating the soil body outside the fender pile above the original tunnel to be 100mm below the top of the fender crown beam of the tunnel; planting bars on the tops of the original tunnel enclosure crown beams to construct retaining walls; paving a spanning Bailey beam on the upright post and the retaining wall; laying a plurality of transverse I-shaped steels on the Bailey beam; laying a ground layer on the I-shaped steel; the longitudinal front and rear sides of the Bailey beam are connected with the earth slope roadbed. The problem of subway station structure complicated, need carry out many times stage segmentation construction, road traffic need change the mediation many times, influence the normal traffic of vehicle and personnel is solved. The invention improves the existing tunnel grating section into a temporary traffic road to form a three-dimensional traffic form, thereby ensuring the construction progress requirement of the subway station and reducing the times of road traffic channel change.
Description
Technical Field
The invention particularly relates to a method for quickly erecting a steel-concrete combined temporary bridge spanning an existing tunnel U-shaped groove, and belongs to the technical field of steel bridges.
Background
A Haerbin subway No. 3 line second-stage engineering Ha-Ping road station is positioned at an intersection of a health care road and the Ha-Ping road, an existing tunnel is penetrated downwards, the periphery of the Haerbin subway No. 3 line is mainly residential areas and enterprise and public institutions, T-shaped transfer is adopted between the Haerbin subway No. 4 line and a planning subway No. 4 line, the No. 3 line is an underground three-layer separated island type station, the No. 4 line is an underground two-layer island type station, a transfer node penetrates downwards through a health care road tunnel, the station is divided into two parts by the health care road tunnel, the total length of the station is 157.30m, the north side width of a standard section is 42.05m, the south side width is 37.95m, and the excavation depth is about 30m.
The construction influence of the Ha-ping road station relates to more existing constructions, such as health-care road tunnels, high-rise residences, DN1400 water supply pipelines, DN1000 drainage pipelines and the like, and 7I-level risk sources exist. The Ha-Ping road station is complex in structure, a main body structure on the north side and an external hanging body adopt a five-column six-span box type structure, a main body structure on the south side and an external hanging body adopt a three-column four-span box type structure, and the Ha-Ping road station relates to a construction method comprising open excavation, underground excavation and cover excavation and is a station with the biggest semi-ring difficulty in the southeast of No. 3 line. The Ha-Ping road station is a complex structure in a complex environment, and is subjected to severe examination for design and construction, so that the overall construction deployment is very important. Because the station construction method is many, the existing tunnel needs to be penetrated under the station structure, the safety risk is large, multiple stage subsection construction needs to be carried out, multiple times of road traffic reversal and change are required on the road section, the normal traffic of vehicles and personnel traffic is inevitably influenced in the subway construction process, the influence of the subway construction on the traffic is reduced, the times of the road traffic reversal and change can be reduced, the construction period of the subway station is not influenced, the existing tunnel grating section can be strided upwards, the road can form a three-dimensional traffic structure, and the times of the road traffic reversal and change are reduced under the condition that the construction progress requirement of the subway station is ensured.
Disclosure of Invention
Aiming at the problems that the subway station has a complex structure, needs to be constructed in stages and sections for multiple times, and the normal traffic of vehicles and personnel is influenced because the road traffic needs to be changed and dredged for multiple times, the invention provides a method for quickly building a steel-concrete combined temporary bridge spanning the existing tunnel U-shaped groove.
The invention provides a method for quickly erecting a steel-concrete combined temporary bridge spanning an existing tunnel U-shaped groove, which specifically comprises the following steps:
(1) Removing the original grating and grating support above the tunnel;
(2) Installing a vertical column pile, a vertical column and a top joist;
(3) Excavating the soil body outside the fender pile above the original tunnel to be 100mm below the top of the fender crown beam of the tunnel;
(4) Planting bars on the tops of the original tunnel enclosure crown beams to construct retaining walls;
(5) Paving transverse Bailey beams on the upright posts and the retaining walls;
(6) Laying a plurality of transverse H-shaped steels on the Bailey beam;
(7) Laying a ground layer on the I-shaped steel;
(8) The longitudinal front and rear sides of the Bailey beam are connected with the earth slope roadbed.
The ground layer comprises steel plates, reinforced concrete plates and asphalt concrete surface layers, the steel plates are paved on the I-shaped steels, the reinforced concrete plates are poured on the steel plates, and the asphalt concrete surface layers are poured on the reinforced concrete plates.
Preferably, the height of the beret beam is 1500mm.
Preferably, the Bailey beams adopt 4m standard sections, and the center distance between each group of main trusses in the longitudinal direction of the Bailey beams 1 is 750mm.
Preferably, the height of the I-steel is 400mm.
Preferably, the thickness of the steel plate is 10mm.
Preferably, the thickness of the asphalt concrete surface layer is 50-78 mm.
Preferably, the method for quickly erecting the steel-concrete combined temporary bridge spanning the existing tunnel U-shaped groove further comprises an upright post, wherein the upright post is positioned between the two retaining walls and used for supporting the bailey beam.
The working principle of the method for quickly erecting the steel-concrete combined temporary bridge spanning the U-shaped groove of the existing tunnel provided by the invention is as follows:
demolish the shaped steel grid of existing tunnel grating section top, reform transform original tunnel barricade structure and fender pile, form the abutment basis, erect steel-framed bridge structure, cross the tunnel on the ground road of being convenient for, accomplish the three-dimensional current form of traffic about road and the tunnel.
Compared with the prior art, the method for quickly erecting the steel-concrete combined temporary bridge spanning the existing tunnel U-shaped groove has the beneficial effects that:
1. according to the tunnel steel bridge structure over the upper span for traffic evacuation in subway construction, the existing tunnel grating section is transformed into a temporary traffic road by transforming the existing tunnel grating section structure, traffic in the direction of the tunnel of the health care road does not need to be interrupted, traffic jam is relieved, and the frequency of road reverse transformation is reduced.
2. The steel bridge structure of the upper-span tunnel for traffic evacuation in subway construction adopts the Bailey beam and the I-steel, and lays the steel plates and the concrete, so that the bearing capacity is high, the steel bridge structure can be used as a temporary traffic road, and vehicles can be effectively guaranteed to pass through.
3. The upper-span tunnel steel-framed bridge structure for traffic evacuation in subway construction is quick to build, short in construction period, convenient to dismantle in the later period and low in cost, and is an excellent choice for temporarily reconstructing roads.
4. The steel bridge structure for the upper-span tunnel for traffic evacuation in subway construction reduces construction of temporary bridges, reduces five thousand of square meters of temporary steel structure temporary roads, saves cost, reduces the running length of vehicles on the temporary road structure during the diversion and modification, and improves the running safety and the construction operation safety of foundation pits.
5. The upper-span tunnel steel bridge structure for traffic evacuation in subway construction reduces the road reverse change times, extends the construction working surface of a subway station, has more continuous construction procedures, greatly shortens the progress construction period, and saves the investment of mechanical equipment and personnel.
Drawings
FIG. 1 is a schematic structural diagram of a steel-concrete composite temporary bridge for quickly erecting a steel-concrete composite temporary bridge spanning an existing U-shaped groove of a tunnel according to the invention;
FIG. 2 is a plan layout view of a steel-concrete composite temporary bridge for quickly erecting a steel-concrete composite temporary bridge spanning an existing tunnel U-shaped groove in a leveling station according to the method for quickly erecting the steel-concrete composite temporary bridge;
in the figure: 1-bailey beam; 2-I-shaped steel; 3-a ground layer; 4-fender posts; 5-retaining wall; 6-upright post.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
the first embodiment is as follows: the present embodiment is explained with reference to fig. 1 to 2. The method for quickly erecting the steel-concrete combined temporary bridge spanning the existing U-shaped groove of the tunnel in the embodiment specifically comprises the following steps:
(1) Removing the original grating and grating support above the tunnel;
(2) Installing a vertical column pile, a vertical column 6 and a top joist;
(3) Excavating the soil body outside the fender post 4 above the original tunnel to be 100mm below the top of the fender crown beam of the tunnel;
(4) Planting bars on the tops of the original tunnel enclosure crown beams to construct retaining walls;
(5) Paving the transverse Bailey beams 1 on the upright posts 6 and the retaining walls 5;
(6) Laying a plurality of transverse I-shaped steels 2 on the Bailey beam 1;
(7) Laying a ground layer 3 on the I-shaped steel 2;
(8) The longitudinal front side and the longitudinal rear side of the Bailey beam 1 are connected with the earth slope roadbed.
The position of the Bailey beam 1 is crossed with the fender pile 4 of the original tunnel of the health care road, the fender pile 4 has influence on laying construction of the Bailey beam 1, and the fender pile influencing the lifting construction of the Bailey beam 1 needs to be detached to the elevation 160.400 before the Bailey beam 1 is lifted.
The fender pile 4 is a buttress type reinforced concrete retaining wall. In order to ensure that the structure of other parts of the open channel is not influenced during dismantling, the fender post 4 is dismantled and cut by a gold steel disc type cutting machine, and then is hoisted and transported to a ballast disposal site. Marking a dismantling elevation stop by using ink lines before dismantling, then cutting by using a gold steel disc type cutting machine, and installing the Bailey beam after ensuring that the concrete surface is leveled to a specified elevation after dismantling.
Because two ends of the Bailey beam 1 need to be erected on the health tunnel anchor pile, the retaining wall DTQ needs to be constructed by planting bars on the top of the health tunnel anchor pile crown beam, and connecting bolts need to be embedded.
The ground layer 3 comprises steel plates, reinforced concrete plates and asphalt concrete surface layers, the steel plates are paved on the I-shaped steels 2, the reinforced concrete plates are poured on the steel plates, and the asphalt concrete surface layers are poured on the reinforced concrete plates.
The height of the Bailey beam 1 is 1500mm. The Bailey beam 1 adopts 4m standard sections, and the center distance of each group of main trusses in the longitudinal direction of the Bailey beam 1 is 750mm. The components of the Bailey beam 1 are connected by steel pins, the longitudinal connecting system of the lower chord is connecting system channel steel, the position of the connecting system channel steel is close to the node of the steel pin, and a second U-shaped bolt is used for connecting the connecting system channel steel with each limb of the lower chord of each Bailey beam 1.
The height of the I-steel 2 is 400mm.
The thickness of the steel plate is 10mm.
The thickness of the asphalt concrete surface layer is 50-78 mm.
The upright post 6 is positioned between the two retaining walls 5 and used for supporting the Bailey beam 1.
1. Concrete pouring process
1) Pouring and vibrating concrete
(1) The method is characterized in that the chiseling treatment is carried out on the concrete surface of the top beam of the anchor pile crown of the original health tunnel before the binding of the steel bars of the fender post, and chiseled concrete slag is cleaned up.
(2) The concrete should be poured in layers according to a certain thickness, sequence and direction, the upper layer concrete should be poured before the lower layer concrete is initially set or can be remolded, the layering should be kept horizontal, and the layering thickness should not exceed the specification.
(3) The concrete is vibrated by adopting an inserted vibrator, the moving distance of each time should not exceed 1.5 times of the action radius of the vibrator, the distance between the vibrator and a side mold should be kept between 5 and 10cm, the lower layer concrete is inserted between 5 and 10cm, a vibrating rod is required to be lifted out slowly while vibrating after each vibration is finished, and the vibrating rod is required to be prevented from colliding with a template, a reinforcing steel bar and other embedded parts.
(4) For each vibration part, the concrete must be vibrated until the part is dense, and the concrete surface stops sinking, and bubbles are not generated, the concrete is flat and the concrete is not easy to spread.
(5) During the concrete pouring process, a specially-assigned person is required to check the stability conditions of the bracket, the template, the steel bar, the embedded part and the like, and when looseness, deformation and displacement are found, the concrete should be timely treated.
(6) In the concrete pouring process, a specially-assigned person is designed to check the stability of the support, the template and the reinforcing steel bar, find problems and immediately process the problems.
(7) After the concrete is poured to the designed elevation, the concrete is observed not to sink any more during vibration, the surface is starched, and the vibrating rod can be slowly drawn out after the horizontal gloss is achieved, so that cavities are prevented from being generated in the concrete.
(8) And after the concrete pouring is finished, finishing the top surface of the pier column. And (4) after flattening and sizing, collecting pulp again and performing calendaring (roughening at the pier column).
2) Curing of concrete
(1) After the concrete is poured, the concrete is covered and maintained by sprinkling water as soon as possible after initial setting, and the surface of the concrete cannot be damaged or polluted during covering. When the concrete surface is covered with the form, the form should be kept wet during curing.
(2) When the temperature is lower than 5 ℃, the concrete surface is kept warm by covering the plastic film and the upper part with the geotextile, so that water cannot be sprayed on the concrete surface.
(3) The conditions of the curing water were the same as those of the mixing water.
(4) The watering curing time of the concrete is generally 7 days; the water is sprayed every day to a degree that the concrete surface can be kept constantly wet.
(5) And after the template is dismantled, immediately modifying the surface of the concrete.
(6) Before the strength of the concrete reaches 2.5MPa, the concrete cannot bear external load.
3) Form removal
(1) And (3) when the concrete reaches a certain strength, removing the formwork (the vertical wall can be removed when the strength of the concrete can ensure that the surface and edges and corners of the concrete are not damaged due to removal), and removing the formwork according to a mode of removing the opposite-top outer side scaffold, removing the opposite-pull pipe and removing the combined steel mould.
(2) After the template is removed, the mortar and dirt on the surface of the template are cleaned, maintained and finished, and a release agent is coated on the template for the next use. After the template is dismantled, the site is cleaned in time, and the templates are stacked orderly.
2. Bailey beam mounting
The span of the Bailey beam is 34.25m, and the width of the Bailey beam is 18m. All are 4m standard segments. The center distance of each group of main trusses of the Bailey beam in the longitudinal direction is 0.75m. The connecting system steel channel is connected with each limb of the lower chord of each Bailey beam by a U-shaped bolt II.
The installation of the Bailey beam adopts the steps of installation by one truss. Erecting the Bailey beams one by one from south to north of the east to the west during field construction, and immediately hoisting the section steel on the upper part of the Bailey beam after the Bailey beam is erected.
1. Preparation for installation
1) Counting of Bailey beam structure accessories
And (4) performing point collection on the Bailey beams and related accessories by organization related departments, wherein the point collection quantity of all the components is correct, and the components are stacked in a specified field after meeting the installation requirement so as to be conveniently assembled on site.
2) The acceptance of mechanical equipment and the training and inspection of special operators.
2. Assembly of Bailey beams
Assembling the Bailey beams in a stacking field, leveling the field, placing 10 x 10cm square timbers at assembly nodes of military variable beams, wherein the distance between the square timbers is consistent with the distance between each node of the Bailey beams, placing two square timbers at each node side by side, leveling by using a leveling instrument, and ensuring that the elevation of the square timbers is consistent and the deviation is controlled within 3 mm.
And (4) adjusting the standard sections to be assembled on the square timber through a crane, aligning the pin holes one by one, and installing steel pin fixing hole positions after the hole positions are aligned. And firstly, mounting an end framework and a standard triangle, then mounting an end chord member, then mounting the standard triangle, finally mounting a horizontal chord member, and completing the assembly of the single Bailey beam.
And rechecking the axis and the level of the Bailey beam assembled into the pieces, and transporting the Bailey beam to the site for installation after the assembly error meets the standard requirement.
3. Bailey beam field installation
1) In situ cleaning
And cleaning floating slag and sundries on the surface of the constructed crown beam, and removing protective plastic paper on the embedded bolts so as to facilitate the installation of the Bailey beam.
And excavating earth in the foundation pit to the elevation of the bottom surface of the Bailey beam.
2) Measuring pay-off
The measuring group adopts a total station or a theodolite to measure the longitudinal and transverse axes of each Bailey beam, and adopts a level gauge to measure the elevation.
3) Mounting of
And after the concrete strength of the crown beam and the concrete retaining wall reaches 85%, setting out the axial mileage of each Bailey beam on the crown beam, and accurately erecting according to the paying-off axial. And a fixed steel plate of the end framework is installed to fix the position of the whole Bailey beam. The connecting system channel steel and the transverse sleeve bolt at the lower part of the Bailey beam are installed after the Bailey beam is longitudinally installed for a certain length.
4) Post-cast strip concrete pouring
The concrete of the post-cast strip of the crown beam is poured before the cover plate is installed.
As the Haping road is an urban trunk line, the traffic flow is large, and the guide and change road (about 6 m) can not meet the passing requirement when a station main body is constructed, a Bailey beam is erected above a health-care road tunnel according to original enclosure piles of the health-care road tunnel and additionally driven by middle lattice columns, so that a steel temporary bridge is formed, and the existing guide and change road is widened to meet the normal passing requirement. The steel bridge structure is connected with the road surfaces at two sides after being built, so that traffic can be carried out and the steel bridge structure can be used as a temporary traffic road.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and that the reasonable combination of the features described in the above-mentioned embodiments can be made, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for quickly erecting a steel-concrete combined temporary bridge spanning an existing tunnel U-shaped groove is characterized by comprising the following steps:
(1) Dismantling the original grating and grating support above the tunnel;
(2) Installing a vertical column pile, a vertical column (6) and a top joist;
(3) Excavating the soil mass outside the fender pile (4) above the original tunnel to be 100mm below the top of the fender crown beam of the tunnel;
(4) Planting bars on the tops of the original tunnel enclosure crown beams to construct retaining walls;
(5) Paving a transverse Bailey beam (1) on the upright post (6) and the retaining wall (5);
(6) A plurality of transverse I-shaped steel beams (2) are laid on the Bailey beam (1);
(7) Laying a ground layer (3) on the I-shaped steel (2);
(8) The longitudinal front side and the longitudinal rear side of the Bailey beam (1) are connected with the earth slope roadbed;
the upright post (6) is positioned between the two retaining walls (5) and is used for supporting the Bailey beam (1);
before the Bailey beam (1) is hoisted, the fender pile influencing the hoisting construction of the Bailey beam (1) is dismantled to the elevation 160.400.
2. The method for quickly erecting the steel-concrete combined temporary bridge spanning the U-shaped groove of the existing tunnel according to claim 1, wherein the ground layer (3) comprises a steel plate, a reinforced concrete plate and an asphalt concrete surface layer, the steel plate is paved on a plurality of I-shaped steels (2), the reinforced concrete plate is cast on the steel plate, and the asphalt concrete surface layer is cast on the reinforced concrete plate.
3. The method for quickly erecting the steel-concrete composite temporary bridge spanning the U-shaped groove of the existing tunnel according to claim 1, wherein the height of the Bailey beam (1) is 1500mm.
4. The method for quickly erecting the steel-concrete combined temporary bridge spanning the U-shaped groove of the existing tunnel according to claim 1, wherein the Bailey beams (1) adopt 4m standard sections, and the center distance between each group of main trusses in the longitudinal direction of the Bailey beams (1) is 750mm.
5. The method for quickly erecting the steel-concrete composite temporary bridge spanning the U-shaped groove of the existing tunnel according to claim 1, wherein the height of the I-shaped steel (2) is 400mm.
6. The method for quickly erecting the steel-concrete combined temporary bridge spanning the U-shaped groove of the existing tunnel according to claim 2, wherein the thickness of the steel plate is 10mm.
7. The method for quickly erecting the steel-concrete combined temporary bridge spanning the U-shaped groove of the existing tunnel according to claim 2, wherein the thickness of the asphalt concrete surface layer is 50-78 mm.
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| CN111779026A (en) * | 2020-07-17 | 2020-10-16 | 上海市城市建设设计研究总院（集团）有限公司 | Capping structure above existing tunnel open section and construction method |
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| FR2979927B1 (en) * | 2011-09-13 | 2019-03-15 | Mustapha Aboulcaid | METHOD FOR THE CONSTRUCTION OF WORKS, ESPECIALLY PASSAGES UNDER RAILWAYS OR SIMILARS IN OPERATION |
| CN202493274U (en) * | 2012-03-23 | 2012-10-17 | 重庆中设工程设计股份有限公司 | Structure of striding large across-section tunnel on existing tunnel through shallow underground excavation |
| CN208136705U (en) * | 2017-05-22 | 2018-11-23 | 中铁第五勘察设计院集团有限公司 | A kind of make-shift bridge device |
| CN107090850A (en) * | 2017-06-27 | 2017-08-25 | 中铁第四勘察设计院集团有限公司 | A kind of subway gateway open-mouth section lateral rigidity enhancing structure |
| CN107558494B (en) * | 2017-10-16 | 2023-04-25 | 西南交通大学 | Underground station structure for rail transit and construction method thereof |
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