CN114790693B - Construction method of large-span river-crossing steel truss bridge structure - Google Patents

Description

Construction method of long-span steel truss bridge structure across the river

Technical Field

The invention relates to the technical field of building construction, and in particular to a construction method of a large-span river-spanning steel truss bridge structure.

Background technique

For the construction of large-span steel truss bridge structures across rivers, large hoisting machinery is usually used for overall hoisting or professional bridge-building equipment is used for construction. When large hoisting machinery is used for hoisting, generally after the truss sections are assembled on site, large hoisting machinery is used to stand on the river bank or on the completed structure for hoisting. This method requires a large component assembly site and has high requirements for the structural bearing capacity of the hoisting machinery station. If it stands on a completed structure, the structure needs to be force-checked and top-back reinforced. When using bridge-building equipment for construction, special bridge-building equipment must be selected. The installation and disassembly cycle of the bridge-building machine is long, the technical difficulty is high, and the requirements for operators are high. To a certain extent, the construction period is extended and the construction cost is increased. The conventional construction method mentioned above has high requirements for construction conditions, is not conducive to shortening the construction period, has high costs, and has a limited scope of application.

The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

Summary of the invention

In order to overcome the defects of the prior art, a construction method of a large-span river-crossing steel truss bridge structure is provided to solve the problems of long construction period and high cost in the construction of large-span river-crossing steel truss bridges using conventional construction methods.

To achieve the above object, a construction method of a large-span river-crossing steel truss bridge structure is provided, comprising the following steps:

Divide the long-span river-crossing steel truss bridge structure into two bank-facing sections and two span middle sections;

Driving four steel pipe piles in the middle of the river channel so that the four steel pipe piles are arranged in a matrix;

Connecting a tie frame between the upper parts of two adjacent steel pipe piles;

Laying top beams on two of the steel pipe piles on opposite sides of the erection direction of the large-span river-crossing steel truss bridge structure;

Laying Bailey support frames on the top beams on opposite sides of the erection direction;

Laying supporting steel sections on opposite sides of the Bailey support frame to form an above-water support platform;

Cast piers on both sides of the river;

Assembling the piers to form shore sections, so that the shore sections on the piers on both sides extend toward the above-water support platform;

Laying a base plate on the bank section so that the base plate is arranged along the length direction of the bank section;

Driving a lifting machine on the base plate to lift the components of the mid-span section;

The mid-span section is respectively assembled between the opposite sides of the above-water support platform and the shore sections of the two banks;

The two mid-span sections are closed to form the long-span river-crossing steel truss bridge structure and the above-water support platform is removed.

Furthermore, the bank section includes a truss lower chord box girder, a truss upper chord box girder, a web member, a scissors brace and a truss outer cantilever beam, and the steps of assembling the bank section include:

Hoisting and installing the truss lower chord box girder to the pier;

A plurality of web members are respectively vertically installed on opposite sides of the truss lower chord box girder, and the plurality of web members are arranged along the length direction of the truss lower chord box girder;

Installing the truss upper chord box girder on the plurality of web members;

Installing the scissors brace between the truss upper chord box girder and the truss lower chord box girder;

The truss outer cantilever beam is installed on the outer sides of the truss upper chord box beam and the truss lower chord box beam to form the bank section.

Furthermore, the steps of respectively casting piers on both sides of the river channel include:

Tie the pier column reinforcement cages on both banks;

Installing a pier column formwork outside the pier column reinforcement cage;

Installing embedded parts on the top of the pier column reinforcement cage;

pouring concrete in the pier column formwork to form the pier column;

After the strength of the pier column meets the design requirements, a conversion bearing is placed on the embedded part on the top of the pier column.

Furthermore, the length of the Bailey support frame is greater than the width of the mid-span section.

Furthermore, the four steel pipe piles are respectively arranged on the outer sides of the mid-span section.

The beneficial effect of the present invention is that the construction method of the large-span river-crossing steel truss bridge structure of the present invention solves the problem that large-scale lifting machinery cannot be used for lifting due to working conditions. Compared with the construction of a highly complex bridge erection machine, it saves costs and shortens the construction period. Moreover, by using steel pipe piles to form an above-water support platform as a temporary support, the required construction equipment is simple and has strong applicability. The support platform can be built in advance, which is conducive to ensuring the construction period. The steel pipe piles can be reused and have good economic efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG1 is a schematic structural diagram of a long-span river-crossing steel truss bridge structure according to an embodiment of the present invention.

FIG2 is a schematic structural diagram of a closure portion of a mid-span section of a long-span river-crossing steel truss bridge structure according to an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of an above-water support platform according to an embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a Bailey support frame according to an embodiment of the present invention.

Detailed ways

The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the inventions. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

1 to 4 , the present invention provides a construction method for a large-span river-span steel truss bridge structure, wherein the large-span river-span steel truss bridge structure includes a truss lower chord box girder 11, a truss upper chord box girder 12, a web member 13, a scissors brace 14 and a truss outer cantilever beam 15.

Specifically, referring to Figures 1 and 2, the truss upper chord box girder 12 is arranged in the same direction as the truss lower chord box girder 11, and the truss upper chord box girder 12 is arranged above the truss lower chord box girder 11. A plurality of web members 13 are connected between the truss upper chord box girder 12 and the truss lower chord box girder 11. In addition, a scissor brace 14 is also connected between the truss upper chord box girder 12 and the truss lower chord box girder 11. A truss outer cantilever beam 15 is connected to the outer side of the truss upper chord box girder 12 and the truss lower chord box girder 11. The upper part of the truss outer cantilever beam 15 is connected to the truss upper chord box girder 12, and the lower part of the truss outer cantilever beam 15 is connected to the truss lower chord box girder 11. Referring to Figure 2, the cross-section of the large-span steel truss bridge structure across the river is generally in an inverted trapezoidal shape.

The construction method of the long-span river-spanning steel truss bridge structure of the present invention comprises the following steps:

S1: Divide the long-span river-crossing steel truss bridge structure into two bank-side sections and two span middle sections1.

In this embodiment, the long-span steel truss bridge structure across the river is divided into four sections in the length direction, including two bank sections and two mid-span sections 1. The bank section has the same structure as the mid-span section 1. One end of the two mid-span sections is coaxially connected, and the bank section is connected to the other end of the mid-span section. The mid-span section is set on the water surface of the river channel, and the bank section is set on the bank of the river channel.

S2: Four steel pipe piles are driven in the middle of the river channel so that the four steel pipe piles are arranged in a matrix.

In this embodiment, four steel pipe piles are first driven in the middle of the river channel, that is, at the position where the two spans are closed. The four steel pipe piles are arranged in a matrix. The four steel pipe piles are arranged in groups of two, and the two groups of steel pipe piles are respectively arranged on opposite sides of the erection route of the long-span steel truss bridge across the river, and the distance between the two groups of steel pipe piles is greater than the width of the long-span steel truss bridge across the river. When dismantling later, it can avoid being blocked by other bridges.

S3: Connect a tie frame between the upper parts of two adjacent steel pipe piles.

The tie frame includes two cross bars and an oblique brace, wherein the two cross bars are connected between the upper parts of two adjacent steel pipe piles, the oblique brace is obliquely connected between the two adjacent steel pipe piles, and the oblique brace is arranged between the two cross bars.

In this embodiment, the ends of the diagonal braces are connected to the intersection of the crossbar and the steel pipe pile.

S4: Lay the top beam on two steel pipe piles on opposite sides of the erection direction of the long-span river-crossing steel truss bridge structure.

S5: Bailey support frames are laid on the top beams on opposite sides of the erection direction.

S6: Lay supporting steel sections on opposite sides of the Bailey support frame to form an above-water support platform 2.

The Bailey support frame (i.e. Bailey frame) arranged on the top beam has Bailey pieces that are tightly fastened to form a stable whole for the water support platform.

Supporting steel sections are laid on the Bailey frame along the erection direction of the long-span river-span steel truss bridge (i.e. the length direction of the long-span river-span steel truss bridge), and unloading steel sections are installed at both ends of the supporting steel sections.

S7: Cast piers on both sides of the river channel.

Specifically, step S7 includes:

S71, tie the pier column reinforcement cage on both sides;

S72, installing the pier column formwork outside the pier column reinforcement cage;

S73. Install embedded parts on the top of the pier column reinforcement cage;

S74, pouring concrete in the pier column formwork to form the pier column;

S75. After the strength of the pier column meets the design requirements, place the conversion bearing on the embedded parts at the top of the pier column.

The elevation of the conversion is flush with the bottom elevation of the long-span steel truss bridge across the river.

S8: Assembling the piers to form shore sections, so that the shore sections on the piers on both sides extend toward the above-water support platform 2 .

Specifically, the steps of assembling the shore section include:

S81. Hoist and install the truss lower chord box girder to the pier column;

S82, vertically installing a plurality of web members on opposite sides of the lower chord box girder of the truss, respectively, and the plurality of web members are arranged along the length direction of the lower chord box girder of the truss;

S83, installing the truss upper chord box girder on the plurality of web members;

S84, installing the scissor brace between the truss upper chord box girder and the truss lower chord box girder;

S85. Install the truss outer cantilever beam on the outer sides of the truss upper chord box beam and the truss lower chord box beam to form a bank section.

S9: Laying a base plate on the bank section so that the base plate is arranged along the length direction of the bank section.

S10: Move the lifting machinery onto the base plate to lift the components of the mid-span section 1.

S11: Assemble the mid-span section 1 between the opposite sides of the water support platform 2 and the shore sections on both banks.

S12: Close the middle sections 1 of the two spans to form a large-span river-crossing steel truss bridge structure and dismantle the water support platform 2.

The base plate is laid on the two installed shore sections, and the base plate is used for the movement of cranes and other lifting machinery. The crane synchronously and symmetrically lifts the middle sections of the two spans on the two completed shore sections.

Among them, the assembly steps of the mid-span section are the same as those of the shore section. One end of the truss lower chord box girder of the mid-span section is butted with the installed truss lower chord box girder of the shore section, and the other end of the truss lower chord box girder of the mid-span section is erected on the unloading steel of the supporting steel of the water support platform, and then other components are installed to complete the penetration of the truss lower chord box girder of the large-span steel truss bridge structure across the river. As mentioned above, the mid-span web bar, truss upper chord box girder, scissor brace, and truss cantilever steel beam are installed in sequence to finally complete the closure of the large-span steel truss bridge structure across the river.

The construction method of the large-span river-crossing steel truss bridge structure of the present invention solves the problem that large-scale lifting machinery cannot be used for lifting due to working conditions. Compared with the construction of the highly complex bridge erection machine, it saves costs and shortens the construction period. Moreover, by using steel pipe piles to form an above-water support platform as a temporary support, the required construction equipment is simple and has strong applicability. The support platform can be built in advance, which is conducive to ensuring the construction period. The steel pipe piles can be reused and have good economic efficiency.

The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims (4)

1. The construction method of the large-span river-crossing steel truss bridge structure is characterized by comprising the following steps of:

dividing the large-span river-crossing steel truss bridge structure into two adjacent shore sections and two middle spans;

four steel pipe piles are arranged in the middle of the river channel in a driving mode, and the four steel pipe piles are arranged in a matrix mode;

a drawknot frame is connected between the upper parts of two adjacent steel pipe piles;

paving top beams on two steel pipe piles on two opposite sides of the long-span river-crossing steel truss bridge structure in the erection direction;

laying bailey support frames on the top beams on two opposite sides of the erection direction;

paving supporting section steel on two opposite sides of the bailey support frame to form a water supporting platform;

respectively pouring pier columns on two sides of a river channel;

assembling the pier columns to form a coastal section, so that the coastal section on the pier columns on two sides extends towards the water supporting platform;

paving a substrate on the adjacent land section, so that the substrate is arranged along the length direction of the adjacent land section;

running a hoisting machine on the substrate to hoist the member of the midspan section;

the midspan section is formed by respectively assembling the opposite sides of the water supporting platform and the adjacent sections of the two banks;

folding the two midspan sections to form the large-span river-crossing steel truss bridge structure and dismantling the water supporting platform;

the face shore section includes truss lower chord box girder, truss upper chord box girder, web member, bracing and truss outer cantilever beam, assembles face shore section's step includes:

hoisting and installing the truss lower chord box girder to the pier column;

a plurality of web members are vertically arranged on two opposite sides of the truss lower chord box girder respectively, and the web members are arranged along the length direction of the truss lower chord box girder;

installing the truss upper chord box girder on a plurality of web members;

the scissor struts are arranged between the truss upper chord box girder and the truss lower chord box girder;

installing the truss outer cantilever beam on the outer sides of the truss upper chord box beam and the truss lower chord box beam to form the shore-facing section;

the assembly of the middle section is the same as the assembly of the adjacent shore section, one end of the truss lower chord box girder of the middle section is in butt joint with the truss lower chord box girder of the installed adjacent shore section, the other end of the truss lower chord box girder of the middle section is erected on the unloading section steel of the support section steel of the water support platform, and then other components are installed, so that the through of the truss lower chord box girder of the large-span river-crossing steel truss bridge structure is completed.

2. The construction method of the long-span river-crossing steel truss bridge structure according to claim 1, wherein the step of casting pier studs on both sides of the river respectively comprises:

binding pier column reinforcement cages on the two sides;

installing pier column templates outside the pier column reinforcement cages;

installing an embedded part at the top of the pier stud reinforcement cage;

pouring concrete in the pier column template to form the pier column;

and after the strength of the pier column meets the design requirement, placing a conversion support on the embedded part at the top of the pier column.

3. The method of constructing a long span river-crossing steel truss bridge structure of claim 1, wherein the bailey support frame has a length greater than the width of the midspan section.

4. The construction method of the large-span river-crossing steel truss bridge structure according to claim 3, wherein the four steel pipe piles are respectively arranged on the outer sides of the midspan sections.