A shared support for steel beam assembly and box girder cast-in-place and a construction method

Abstract

The application discloses a shared support for steel beam assembly and box girder cast-in-situ and a construction method, the shared support comprises an expanded foundation group, a steel pipe column group and a protection platform, the expanded foundation group is arrayed, the steel pipe column group comprises a standard section and an adjusting section, the bottom end of the standard section is connected with the corresponding expanded foundation group, the top end of the standard section is connected with the adjusting section, the top end of the adjusting section is provided with a transverse distribution beam, a connecting system is arranged between adjacent standard sections, the connecting system comprises a transverse connecting system and a longitudinal connecting system, the protection platform is arranged on the connecting system and is not higher than the top end of the standard section. According to the shared support for steel beam assembly and box girder cast-in-situ and the construction method, the shared support is installed once, the lower part is used for normal vehicle passing, the upper part is used for steel beam assembly firstly and then is used for box girder cast-in-situ operation, and the bridge construction under the narrow operation condition in the urban area is met.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a shared support structure and construction method for steel beam assembly and box girder casting. Background Technology

[0002] When constructing elevated bridges on existing urban roads, and the site is narrow with no diversion channels, it is necessary to set up a temporary traffic lane under the bridge construction. For the handling of adjacent cast-in-place continuous box girders and steel beams with significant differences in longitudinal slope, the existing technologies offer two approaches: First, consider temporary traffic lanes within each construction area and set up separate supports for the steel beams and cast-in-place box girders. The disadvantages of this method are long construction cycles for the temporary traffic lanes and supports, large material inputs, and significant traffic diversion pressure. Second, first erect steel beam assembly supports within the cast-in-place box girder area, then dismantle and erect full-span supports for the cast-in-place box girder construction. The disadvantages of this method are that the supports are not universal, leading to large investments, and the temporary traffic lanes face issues of lane changes or occupancy due to the construction of the supports before and after, making traffic management difficult. Summary of the Invention

[0003] This invention aims to propose a shared support structure and construction method for steel beam assembly and box girder casting, solving the problem of meeting traffic requirements during construction of urban viaducts when cast-in-place continuous box girders and steel beams are adjacent and have significant differences in longitudinal slope.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A shared support system for steel beam assembly and box girder casting includes: an enlarged foundation assembly, a steel pipe column assembly, and a protective platform.

[0006] The expanded basic group array distribution;

[0007] The steel pipe column assembly includes standard sections and adjustable sections. The bottom of each standard section is connected to the corresponding enlarged foundation assembly, and the top of each standard section is connected to the adjustable section. The top of each adjustable section is provided with a transverse distribution beam. A connection system is provided between adjacent standard sections. The connection system includes a transverse connection system and a longitudinal connection system.

[0008] The protective platform is mounted on the connecting system and is not higher than the top of the standard section.

[0009] In some embodiments, a longitudinal beam is also provided, which is disposed on the transverse distribution beam, and a slope adjustment pad is provided between the longitudinal beam and the transverse distribution beam.

[0010] In some embodiments, a jack is also provided, which is mounted on the longitudinal beam and is used to adjust the height difference between the steel beam segments.

[0011] Based on the above construction method for using shared supports for steel beam assembly and box girder casting.

[0012] The first step is to use a gantry crane to install a common support frame. Precast enlarged foundation groups and steel pipe column groups are set up perpendicular to the bridge centerline within the projection range of each span of the cast-in-place continuous box girder connected to the steel box girder. A connecting system is set between adjacent steel pipe column groups. A transverse distribution beam is set on the top surface of the steel pipe column group, and a protective platform is installed on the top surface of the connecting system.

[0013] The second step is to install slope adjustment pads and longitudinal beams on the top surface of the transverse distribution beams, and to place jacks on the top surface of the longitudinal beams.

[0014] The third step is to hoist the steel box girder segments in sections, adjust the height difference between the segments with jacks and weld them into a whole to complete the assembly of a steel girder segment in a jacking cycle.

[0015] Fourth step: Repeat step three to complete the assembly and jacking of all steel beams into place;

[0016] The fifth step is to remove the jacks, longitudinal beams, slope adjustment blocks and adjustment sections, and then move the transverse distribution beam down to the standard section and connect and fix it.

[0017] The sixth step is to install longitudinal Bailey beams on the top surface of the transverse distribution beams within the span of each box girder. A full-span scaffold is erected on the top surface of the Bailey beams, and the outer formwork structure is installed on it. After the pre-stressing is qualified, the box girder is cast in place.

[0018] Once the box girder is cast in place, the entire bridge construction is complete.

[0019] The beneficial effects of this invention are as follows:

[0020] According to the present invention, a shared support and construction method for steel beam assembly and box girder casting is used to form a traffic lane between the protective platform and the steel pipe column assembly, which can be used for vehicle passage.

[0021] The steel pipe column assembly includes a standard section and an adjustable section. Together with the transverse distribution beam, longitudinal beam, and slope adjustment pad, it forms a shared support to meet the slope requirements for steel beam segment splicing, thus enabling steel beam construction. When the steel beam is assembled, only the adjustable section columns and longitudinal beams are removed, and the transverse distribution beam is moved down, so that the support can be used for the cast-in-place construction of box girders, saving time and costs. Attached Figure Description

[0022] Figure 1 This is a longitudinal schematic diagram of the steel beam construction using a shared support system for steel beam assembly and box girder casting, according to an embodiment of the present invention.

[0023] Figure 2 This is a transverse schematic diagram of the construction of a steel beam using a shared support system for steel beam assembly and box girder casting, according to an embodiment of the present invention.

[0024] Figure 3 This is a partially enlarged transverse view of a shared support structure for steel beam assembly and box girder casting according to an embodiment of the present invention.

[0025] Figure 4 This is a longitudinal schematic diagram of the construction of a box girder using a shared support system for steel beam assembly and cast-in-place box girder, according to an embodiment of the present invention.

[0026] Figure 5 This is a transverse schematic diagram of the construction of a box girder using a shared support system for steel beam assembly and cast-in-place box girder, according to an embodiment of the present invention. Detailed Implementation

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] The shared support for steel beam assembly and box girder casting in this embodiment of the invention includes: an enlarged foundation group 1, a steel pipe column group, and a protective platform.

[0029] Specifically, such as Figure 1-3 As shown, the expanded foundation group 1 is arrayed on the ground. The steel pipe column group includes standard section 2 and adjusting section 3, both of which are steel pipe columns. The bottom end of standard section 2 is fixedly connected to the expanded foundation group, and its top end is detachably fixedly connected to the bottom end of adjusting section 3. The length of adjusting section 3 is related to the slope, and the line connecting the top ends of adjusting sections 3 corresponds to the curve of the steel beam. A connecting system is also provided between adjacent steel pipe column groups, including a transverse connecting system 4 and a longitudinal connecting system 5. A protective platform 6 is installed above the connecting system, and the upper surface of the protective platform 6 is at least 10 cm lower than the top end of standard section 2. A transverse distribution beam 7 is provided at the top end of adjusting section 2, and a longitudinal beam 8 is provided on the transverse distribution beam 7. An adjusting slope pad 9 is provided between the transverse distribution beam 7 and the longitudinal beam 8. The transverse distribution beam 7 and the longitudinal beam 8 form a working platform, and the adjusting slope pad 9 is used to adjust the height of the longitudinal beam. Jacks 10 are provided at the four corners of each steel beam segment or guide beam segment on the top surface of the longitudinal beam 8.

[0030] The construction method for using a shared support system for steel beam assembly and box girder casting according to an embodiment of the present invention is as follows:

[0031] The first step involves setting up an enlarged foundation assembly 1 on the ground within the projection range of each span of the cast-in-place continuous box girder that connects to the downslope direction of the steel box girder. Standard sections 2 are then hoisted onto the enlarged foundation assembly, followed by the installation of adjusting sections 3. The two sections are detachably and securely connected using bolts. A transverse connecting system 4 is installed between adjacent standard sections 2 laterally, and a longitudinal connecting system 5 is installed between adjacent standard sections 2 longitudinally. A protective platform 6 is installed on the top surface of the connecting systems, and a transverse distribution beam 7 is installed on the top surface of the adjusting sections 3.

[0032] The second step is to install the longitudinal beam 8 on the top surface of the transverse distribution beam 7, and connect the two through the slope adjustment pad 9. Install the jacks 10 at the corresponding positions of the four corners of each steel beam segment or guide beam segment on the top surface of the longitudinal beam 8.

[0033] The third step is to hoist the steel beam segments, adjust the height difference between adjacent steel beam segments using jack 10, and weld them into a whole to complete the assembly of a steel beam segment in one jacking cycle.

[0034] Fourth step: Repeat step three to complete the assembly and jacking of all steel beams into place.

[0035] Step 5: Remove jack 10, longitudinal beam 8, slope adjusting pad 9, and adjusting section 3. Then, move the transverse distribution beam 7 down onto standard section 2 and connect and fix it, as detailed below. Figure 4 , Figure 5 As shown.

[0036] Step 6: Install longitudinal Bailey beams on the top surface of the transverse distribution beams 7 within the span of each box girder. Erect full-span scaffolding on the top surface of the Bailey beams, and install the outer formwork structure on it. After the pre-stressing is qualified, carry out the in-situ casting construction of the box girder.

[0037] Once the box girder is poured, the entire bridge construction is complete.

[0038] According to the present invention, the shared support and construction method for steel beam assembly and box girder casting, during steel beam construction, a traffic lane is formed between the protective platform 6 and the steel pipe column group, and the steel beam can be used for cast-in-place box girder construction after only partial dismantling is completed, saving costs and time, and meeting the requirements of bridge construction under narrow working conditions in urban areas.

[0039] This embodiment does not impose any limitation on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0041] If the terms "first" or "second" are used in this document to define components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing the invention and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shared support system for steel beam assembly and box girder casting, characterized in that, include: Expand the base group, wherein the expanded base group array is distributed; A steel pipe column assembly, comprising standard sections and adjustable sections, wherein the bottom end of each standard section is connected to a corresponding enlarged foundation assembly, and the top end of each standard section is connected to the adjustable section, wherein the top end of each adjustable section is provided with a transverse distribution beam, and a connecting system is provided between adjacent standard sections, the connecting system including a transverse connecting system and a longitudinal connecting system; A protective platform is mounted on the connecting system and is not higher than the top of the standard section; It is also provided with a longitudinal beam, which is provided on the transverse distribution beam, and a slope adjustment pad is provided between the longitudinal beam and the transverse distribution beam; A jack is also provided, which is installed on the longitudinal beam and is used to adjust the height difference between the steel beam segments; The construction method for using the same support system for both steel beam assembly and box girder casting includes: The first step is to use a gantry crane to install a common support frame. Precast enlarged foundation groups and steel pipe column groups are set up perpendicular to the bridge centerline within the projection range of each span of the cast-in-place continuous box girder connected to the steel box girder. A connecting system is set between adjacent steel pipe column groups. A transverse distribution beam is set on the top surface of the steel pipe column group, and a protective platform is installed on the top surface of the connecting system. The second step is to install slope adjustment pads and longitudinal beams on the top surface of the transverse distribution beams, and to place jacks on the top surface of the longitudinal beams. The third step is to hoist the steel beam segments in sections, adjust the height difference between the steel beam segments with jacks and weld them into a whole, thus completing the assembly of a steel beam segment in one jacking cycle. Fourth step: Repeat step three to complete the assembly and jacking of all steel beams into place; The fifth step is to remove the jacks, longitudinal beams, slope adjustment blocks and adjustment sections, and then move the transverse distribution beam down to the standard segment steel pipe column and connect and fix it. The sixth step is to install longitudinal Bailey beams on the top surface of the transverse distribution beams within the span of each box girder. A full-span scaffold is erected on the top surface of the Bailey beams, and the outer formwork structure is installed on it. After the pre-stressing is qualified, the box girder is cast in place. Once the box girder is cast in place, the entire bridge construction is complete.

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