CN113737662A - Quick construction method for striding existing high-speed railway on large-span and large-section pedestrian overpass - Google Patents
Quick construction method for striding existing high-speed railway on large-span and large-section pedestrian overpass Download PDFInfo
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- CN113737662A CN113737662A CN202111198075.1A CN202111198075A CN113737662A CN 113737662 A CN113737662 A CN 113737662A CN 202111198075 A CN202111198075 A CN 202111198075A CN 113737662 A CN113737662 A CN 113737662A
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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 quick construction method for striding an existing high-speed railway on a large-span and large-section pedestrian overpass, and relates to the technical field of large-span overpass construction. The invention comprises the following steps: measuring and taking points of existing facilities on a construction site by using a measuring instrument; importing the measured data into software, and performing modeling analysis on a construction site by using the software; and treating the foundation, building a traveling channel and a lifting station site of the lifting device, and hardening the concrete of the lifting station site. The construction method uses conventional material design such as steel plates, I-beams and the like and other auxiliary measures to finish the installation of the overpass, the process principle is easy to understand, the construction method is simple, the operability is high, large-scale hoisting equipment is adopted, large-scale structures of the overpass on the existing railway are hoisted, compared with a jacking method, a large number of temporary supports and jacking equipment are not needed to be invested, the requirement that 60% of the hoisting quantity of the overpass structures is finished within 2 hours to the welding quantity can be met, the construction procedures are reduced, and the construction method has high economy, high construction efficiency and high safety.
Description
Technical Field
The invention belongs to the technical field of large-span overpass construction, and particularly relates to a quick construction method for an existing high-speed railway over a large-span and large-section pedestrian overpass.
Background
With the rapid development of our Chinese economy, the Chinese railway system plays an extremely important role in the development process, however, the rapid pace development makes the early-built ordinary railway appear to be somewhat inattentive.
In the latest railway planning schema, the construction of modern high-efficiency highway networks is pointed out clearly, and the coverage of the highway networks is enlarged. Therefore, two or even a plurality of high-speed railways are often constructed in a crossed manner in the process of constructing the high-speed railways, and a plurality of existing ordinary passenger stations are upgraded and transformed into the high-speed passenger stations, so that a plurality of construction tasks spanning the existing high-speed railways, namely business line construction, which is the most troublesome construction task of all construction enterprises, are included.
In the latest railway planning outline, the requirements of construction efficiency, safety of existing railway equipment, reliability of hoisting equipment and the like in the construction of business lines are extremely high, and the hoisting of the upper span structure to the welding amount is finished by 60% within 2 hours specified by railway departments.
In the prior art, when a large-span pedestrian overpass is built on an existing high-speed railway, a pushing method is mostly adopted for building, however, the pushing method needs to prepare a large number of supports and pushing equipment, has the defects of complex construction, long period, low economy, low operability, low efficiency and the like, cannot meet the requirement that 60% of the load of an overpass structure is completed from lifting to welding within 2 hours, and based on the problems, a large-span and large-section pedestrian overpass upper-span existing high-speed railway rapid construction method is provided to solve the problems of complex construction, long period, low economy, low operability, low efficiency and the like during construction of business lines.
Disclosure of Invention
The invention aims to provide a quick construction method for striding an existing high-speed railway on a large-span and large-section pedestrian overpass, which aims to solve the existing problems: in the prior art, when a large-span pedestrian overpass is built on an existing high-speed railway, the overpass is mostly built in a pushing method, however, the pushing method needs to prepare a large number of supports and pushing equipment, has the defects of complex construction, long period, low economy, low operability, slow efficiency and the like, and cannot meet the requirement that 60% of the upper-span structure is completed from hoisting to welding within 2 hours.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a quick construction method for striding an existing high-speed railway on a large-span and large-section pedestrian overpass, which comprises the following steps:
step 1: measuring and taking points of existing facilities on a construction site by using a measuring instrument;
step 2: importing the measured data into software, and performing modeling analysis on a construction site by using the software;
and step 3: treating the foundation, building a traveling channel and a lifting station site of the lifting device, and hardening concrete at the lifting station site;
and 4, step 4: an assembling jig frame is arranged on one side of a railway and used for assembling an overpass main body;
and 5: fixing steel column support frames at two ends of a railway track, and erecting scaffold frames outside the steel column support frames for subsequent construction;
step 6: welding an abdomen reinforcing pipe and a lower steel bracket on the outer side of the steel column support frame through a scaffold;
and 7: assembling the overpass main body through hoisting equipment and an assembling jig frame, and respectively welding temporary support rods at two ends of the overpass main body;
and 8: hoisting the overpass main body by a hoisting device, placing the overpass main body between two steel column support frames, and welding a lower steel corbel with the overpass main body, the steel column support frames and temporary support rods;
and step 9: and (4) dismantling the temporary support rod, and welding a web member at the upper end of the steel column support frame to complete the construction of the overpass on the existing high-speed railway.
Furthermore, the steel column support frame is formed by welding four steel columns and four steel beams between the columns, and the specification of the steel column is phi 800 x 20 mm.
Further, down the steel corbel by a plurality of Q355B-30mm thick steel plate welding constitute, the cross-section of steel corbel is right trapezoid down, its cross-sectional height 300mm-500mm, width 400mm, length 500mm, and corbel web both sides set up three 20mm thick reinforcing plates, adjacent two interval between the reinforcing plate is 100 mm.
Furthermore, the temporary support rod is formed by welding a plurality of H-shaped steel, the specification of the H-shaped steel is 700 x 300 x 30mm, the temporary support rod is arranged inside and on two sides of a web plate of the H-shaped steel, and a stiffening plate with the thickness of 20mm is arranged every 300 mm.
Furthermore, in the step 3, the bearing capacity after foundation treatment is greater than 150kpa, a phi 10mm-HRB400 steel mesh is pre-embedded at the hoisting station, the concrete hardening thickness is 0.5M, and the concrete strength is C30, so that the hoisting device is convenient to walk and operate, and the construction safety and quality of the overpass are guaranteed.
Further, in step 7, full welding is performed between the overpass main body and the temporary supporting rod, the length of a welding seam is 1400mm, and the height of a welding corner is 20 mm.
Further, the hoisting equipment in the step 8 is a conventional large-scale hoisting mechanical equipment crawler crane, and the rated hoisting capacity of the crawler crane is 650 tons
Further, in step 8, full penetration welding is performed between the lower steel corbel and the overpass main body.
The invention has the following beneficial effects:
1. the construction method adopts large-scale hoisting equipment to hoist the large-scale structure of the existing railway of the upper span, compared with a jacking method, a large number of temporary supports and jacking equipment are not required to be invested, the requirement that 60% of the upper-span structure is completed from hoisting to welding within 2 hours can be met, the construction procedures are reduced, and the construction method has high economical efficiency and high construction efficiency.
2. The construction method adopts the conventional large-scale hoisting mechanical equipment crawler crane, has high hoisting safety factor when the existing high-speed railway is spanned, and can fully ensure the safety of the existing railway equipment.
3. The construction method uses the conventional material design such as steel plates, I-shaped steel and other auxiliary measures to finish the installation of the overpass, and has the advantages of easily understood process principle, simple construction method and stronger operability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is an overall schematic view of the large-span overpass of the present invention after completion of construction;
FIG. 2 is a schematic view of the construction of a steel column support frame and lower steel corbel of the present invention;
FIG. 3 is a schematic structural view of a steel column support frame, an overpass main body and a temporary support rod according to the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3A in accordance with the present invention;
FIG. 5 is a schematic structural view of a steel column support frame, an overpass main body and a web member according to the present invention;
FIG. 6 is a schematic structural view of a lower steel corbel of the present invention;
fig. 7 is a schematic structural view of the temporary support rod of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a steel column support frame; 2. an abdominal stiffening tube; 3. a steel corbel is put; 4. an overbridge main body; 5. a temporary support bar; 6. a web member.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment discloses a quick construction method for striding an existing high-speed railway on a large-span and large-section pedestrian overpass, which comprises the following steps:
please refer to fig. 1-6:
the first step is as follows: measuring and taking points of existing facilities on a construction site by using a measuring instrument;
the second step is that: importing the measured data into software, and performing modeling analysis on a construction site by using the software;
the third step: treating the foundation to enable the bearing capacity after the foundation treatment to be larger than 150kpa, building a travelling channel of a hoisting device and a hoisting station site, pre-burying a phi 10mm-HRB400 steel bar mesh at the hoisting station site, and performing concrete hardening treatment on the hoisting station site, wherein the concrete hardening thickness is 0.5M, and the concrete strength is C30, so that the hoisting device is convenient to travel and operate, and the construction safety and quality of the overpass are guaranteed;
the fourth step: an assembling jig frame is arranged on one side of the railway and used for assembling the platform bridge main body 4;
the fifth step: prefabricating a steel column support frame 1, wherein the steel column support frame 1 is formed by welding four steel columns and four steel beams among the columns, and the specification of the steel column is phi 800 x 20 mm;
and a sixth step: prefabricating a lower steel corbel 3, wherein the lower steel corbel 3 is formed by welding a plurality of Q355B-30mm thick steel plates, the section of the lower steel corbel 3 is in a right trapezoid shape, the height of the section is 300-500 mm, the width is 400mm, the length is 500mm, three reinforcing plates with the thickness of 20mm are arranged on two sides of a corbel web plate, and the distance between every two adjacent reinforcing plates is 100 mm;
the seventh step: prefabricating a temporary support rod 5, wherein the temporary support rod 5 is formed by welding a plurality of H-shaped steel, the specification of the H-shaped steel is 700 x 300 x 30mm, the temporary support rod 5 is arranged inside and positioned at two sides of a web plate of the H-shaped steel, and a stiffening plate with the thickness of 20mm is arranged every 300mm
Eighth step: fixing steel column support frames 1 at two ends of a railway track, and erecting scaffold frames outside the steel column support frames 1 for subsequent construction;
the ninth step: welding an abdomen reinforcing pipe 2 and a lower steel corbel 3 on the outer side of the steel column support frame 1 through a scaffold;
the tenth step: assembling an overpass main body 4 through hoisting equipment and an assembling jig frame, respectively welding temporary support rods 5 at two ends of the overpass main body 4, wherein full welding is adopted between the overpass main body 4 and the temporary support rods 5, the length of a welding seam is 1400mm, and the height of a welding corner is 20 mm;
the eleventh step: hoisting an overbridge main body 4 by using a crawler crane with the rated hoisting capacity of 650 tons, placing the overbridge main body 4 between two steel column support frames 1, welding a lower steel corbel 3 and the overbridge main body 4, welding the steel column support frames 1 and a temporary support rod 5, and carrying out full penetration welding between the lower steel corbel 3 and the overbridge main body 4;
the twelfth step: and (5) dismantling the temporary support rod 5, and welding a web member 6 at the upper end of the steel column support frame 1 to complete the construction of the overpass on the existing high-speed railway.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. A quick construction method for striding an existing high-speed railway on a large-span and large-section pedestrian overpass is characterized by comprising the following steps:
step 1: measuring and taking points of existing facilities on a construction site by using a measuring instrument;
step 2: importing the measured data into software, and performing modeling analysis on a construction site by using the software;
and step 3: treating the foundation, building a traveling channel and a lifting station site of the lifting device, and hardening concrete at the lifting station site;
and 4, step 4: an assembling jig frame is arranged on one side of the railway and is used for assembling the overpass main body (4);
and 5: fixing steel column support frames (1) at two ends of a railway track, and erecting a scaffold outside the steel column support frames (1) for subsequent construction;
step 6: an abdomen reinforcing pipe (2) and a lower steel corbel (3) are welded on the outer side of the steel column support frame (1) through a scaffold;
and 7: assembling the overpass main body (4) through hoisting equipment and an assembling jig frame, and respectively welding temporary support rods (5) at two ends of the overpass main body (4);
and 8: hoisting the overpass main body (4) by using a hoisting device, placing the overpass main body (4) between two steel column support frames (1), and welding a lower steel corbel (3) with the overpass main body (4), the steel column support frames (1) and a temporary support rod (5);
and step 9: and (5) dismantling the temporary support rod (5), and welding a web member (6) at the upper end of the steel column support frame (1) to complete the construction of the overpass on the existing high-speed railway.
2. The construction method for quickly constructing the existing high-speed railway on the large-span and large-section pedestrian overpass is characterized in that the steel column support frame (1) is formed by welding four steel columns and four steel beams among the columns, and the specification of the steel columns is phi 800 mm by 20 mm.
3. The construction method for quickly constructing the existing high-speed railway on the upper span of the large-span and large-section pedestrian overpass is characterized in that the lower steel bracket (3) is formed by welding a plurality of Q355B-30mm thick steel plates, the section of the lower steel bracket (3) is in a right trapezoid shape, the height of the section of the lower steel bracket is 300-500 mm, the width of the lower steel bracket is 400mm, the length of the lower steel bracket is 500mm, three 20mm thick reinforcing plates are arranged on two sides of a web plate of the lower steel bracket, and the distance between every two adjacent reinforcing plates is 100 mm.
4. The construction method for quickly constructing the existing high-speed railway on the large-span and large-section pedestrian overpass is characterized in that the temporary support rod (5) is formed by welding a plurality of H-shaped steels, the specification of the H-shaped steels is 700 x 300 x 30mm, the temporary support rod (5) is arranged inside and on two sides of a web plate of the H-shaped steel, and a stiffening plate with the thickness of 20mm is arranged every 300 mm.
5. The construction method for quickly constructing the existing high-speed railway on the overpass on the large-span and large-section pedestrian overpass according to claim 1, wherein in the step 3, the bearing capacity after foundation treatment is more than 150kpa, a phi 10mm-HRB400 steel mesh is pre-embedded at a hoisting station, the hardened thickness of concrete is 0.5M, and the strength of concrete is C30, so that the hoisting device is convenient to walk and operate, and the construction safety and quality of the overpass are guaranteed.
6. The construction method for quickly constructing the overpass over the existing high-speed railway with the large span and the large section of the pedestrian overpass according to claim 1, wherein in the step 7, full welding is performed between the main body (4) of the overpass and the temporary support rod (5), the length of the welding seam is 1400mm, and the height of the welding angle is 20 mm.
7. The construction method for quickly constructing the existing high-speed railway on the overpass of the large-span and large-section pedestrian overpass according to claim 1, wherein the hoisting equipment in the step 8 is a conventional large-scale hoisting mechanical equipment crawler crane, and the rated hoisting capacity of the crawler crane is 650 tons.
8. The construction method for quickly constructing the existing high-speed railway on the upper span of the large-span and large-section pedestrian overpass is characterized in that in the step 8, the lower steel corbel (3) and the overpass main body (4) are welded completely.
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| CN202111198075.1A CN113737662A (en) | 2021-10-14 | 2021-10-14 | Quick construction method for striding existing high-speed railway on large-span and large-section pedestrian overpass |
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| CN202111198075.1A CN113737662A (en) | 2021-10-14 | 2021-10-14 | Quick construction method for striding existing high-speed railway on large-span and large-section pedestrian overpass |
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