Steel bracing continuous rigid frame bridge triangular area construction device and method

Abstract

The application relates to a construction device and method for a steel bracing continuous rigid frame bridge triangular area, and belongs to the technical field of bridge engineering. The construction device comprises a buckle cable mechanism and a support mechanism. The buckle cable mechanism comprises a plurality of temporary buckle cables arranged between a concrete pier column and a steel bracing, and the concrete pier column is rotationally connected with the steel bracing. The support mechanism comprises a plurality of temporary supports vertically arranged between the steel bracing and a concrete main beam. In actual use, the rotationally connected mode such as the hinge is adopted between the concrete pier column and the steel bracing, so that the angle between the steel bracing and the concrete pier column can be adjusted according to the construction requirement, the temporary buckle cable is avoided from being adjusted, the construction becomes more convenient, the construction monitoring difficulty is reduced, the bridge structure internal force is conveniently adjusted according to the monitoring result, and the construction efficiency and the construction quality are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering, in particular to a construction device and method for a steel diagonal bracing continuous rigid frame bridge triangular area. BACKGROUND

[0002] At present, in the construction of a continuous rigid frame bridge, in order to adapt to different rigid frame bridge structures and surrounding environments, the commonly used construction method of the continuous rigid frame bridge generally adopts the cantilever construction method, but is only applicable to the case of a small span of the continuous rigid frame bridge. For a large-span open-web rigid frame bridge, the bridge deck and the lower chord beam cannot be separated during the construction process, and the long cantilever hanging basket construction method cannot be used alone, so the corresponding auxiliary facilities are generally used to complete the construction of the open-web rigid frame bridge.

[0003] In the related art, the construction is generally performed by using a buckle cable support combined construction method and a double buckle cable method. The buckle cable support combined construction method is a method of constructing the upper chord by using the lower chord buckle cable in combination with the support. The double buckle cable construction method is a method of constructing the bridge deck and the lower chord beam by using the hanging basket, and the cantilever is poured and constructed by using the corresponding cable-stayed buckle cable tensioning method.

[0004] However, for the case of using the steel diagonal bracing for the lower chord beam, the double buckle cable construction method needs to set two layers of cables, which increases the amount of temporary engineering and equipment; at the same time, the construction operation surface is large, the upper buckle cable and the tower occupy the bridge deck construction space, and the process is complicated. The buckle cable support combined construction method will cause a significant change in the load acting on the lower chord beam when pouring the prestressed concrete main beam, and a large bending moment will occur at the root section of the lower chord beam, which is very unfavorable for the stress of the steel and the joint part, and thus the temporary buckle cable needs to be dynamically adjusted, and the position and strength of the support need to be strictly controlled, which increases the construction control difficulty and prolongs the construction period.

[0005] Therefore, a new construction device for adjusting the internal force of the triangular area of the steel diagonal bracing continuous rigid frame bridge can be designed, which is beneficial to the development and application of the open-web continuous rigid frame bridge in urban rail transit. SUMMARY

[0006] The embodiments of the present application provide a construction device and method for a steel diagonal bracing continuous rigid frame bridge triangular area, to solve the problem that in the related art, the temporary buckle cable needs to be dynamically adjusted when the lower chord beam of the rigid frame bridge triangular area is constructed, which brings inconvenience to the construction.

[0007] In a first aspect, the embodiments of the present application provide a construction device for a steel diagonal bracing continuous rigid frame bridge triangular area, comprising:

[0008] A buckle cable mechanism, the buckle cable mechanism comprises a plurality of temporary buckle cables arranged between a concrete pier and a steel diagonal bracing, and the concrete pier and the steel diagonal bracing are rotationally connected;

[0009] A support mechanism, comprising a plurality of temporary supports vertically arranged between the steel diagonal brace and the concrete main girder.

[0010] In some embodiments, the concrete pier column and the steel diagonal brace are connected through a hinged device.

[0011] In some embodiments, a hanging basket is arranged on the concrete main girder.

[0012] In some embodiments, the hinged device is arranged on the outer wall of the concrete pier column.

[0013] In some embodiments, the temporary support comprises a pre-embedded part, a steel pipe support and a bottom mold.

[0014] In some embodiments, the pre-embedded part is installed on the steel diagonal brace and connected with the steel pipe support.

[0015] In some embodiments, the steel pipe support is vertically arranged at the lower end of the concrete main girder.

[0016] In some embodiments, the top of the steel pipe support is connected with a bottom mold, which can provide temporary support for cantilever pouring of the top chord box girder.

[0017] In a second aspect, the embodiments of the present application provide a construction method of a steel diagonal brace continuous rigid frame bridge triangular area, which is implemented by using the construction device of the steel diagonal brace continuous rigid frame bridge triangular area described above, and comprises the following steps:

[0018] Each segment of the prefabricated steel diagonal brace is constructed, the concrete pier column and the initial steel structure segment of the two steel diagonal braces on both sides of the concrete pier column in the longitudinal bridge direction are constructed, and a hinged device is installed at the end of the concrete pier column;

[0019] An initial segment of the top chord girder is constructed on the top end surface of the concrete pier column, and a hanging basket for cantilever pouring of the remaining top chord girder segments is installed on both sides of the initial segment of the top chord girder, wherein the hanging basket is movable and can hoist the bottom chord steel segment;

[0020] The bottom chord steel segment is installed synchronously with the top chord girder, the steel diagonal brace is hinged with the initial steel segment, the temporary stay cables for anchoring the completed bottom chord steel segment to the concrete pier column are tensioned in pairs, the bottom chord girder segment is used as support, a temporary support is installed to support the top chord girder segment;

[0021] Until the top chord girder segment and the bottom chord girder segment complete the triangular area closure, the cross section at the hinged device is solidified, and the temporary stay cables and the temporary support are removed.

[0022] In some embodiments, after the hanging baskets are installed, the two hanging baskets are moved synchronously in the direction away from both sides of the initial segment of the top chord girder, and the top chord girder segments are poured.

[0023] The technical scheme provided by the application has the beneficial effects of:

[0024] The application provides a construction device and method for a triangular area of a steel-braced continuous rigid frame bridge.

[0025] In actual use, pouring the prestressed concrete main beam will cause a significant change in the load acting on the lower chord beam, and a large bending moment will occur in the root section of the lower chord beam. Therefore, when constructing the lower chord beam in the triangular area of the rigid frame bridge, the temporary buckling cable often needs to be dynamically adjusted, which increases the construction difficulty and the construction period, and brings inconvenience to the construction. The rotating connection between the concrete pier column and the steel brace, such as the hinge, can facilitate the adjustment of the angle between the steel brace and the concrete pier column according to the construction needs, avoid the adjustment of the temporary buckling cable, make the construction more convenient, and reduce the construction monitoring difficulty. According to the monitoring results, the internal force of the bridge structure is conveniently adjustable, and the construction efficiency and construction quality are improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 A schematic view after the initial segment of the steel brace and the hinge device are installed;

[0028] Figure 2 A schematic view after the first segment of the upper chord beam is completed;

[0029] Figure 3 A schematic view before the triangular area is closed;

[0030] Figure 4 A schematic view after the triangular area is closed;

[0031] Figure 5 A schematic view when the hinge device is fixed;

[0032] Figure 6 A schematic view after the temporary structure is removed.

[0033] Reference signs:

[0034] 1, concrete pier column; 2, concrete main beam; 3, steel diagonal brace; 4, temporary cable; 5, temporary support; 6, hinged device; 7, hanging basket. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0036] The embodiments of the present application provide a construction device and method for a steel diagonal brace continuous rigid frame bridge triangular area, which can solve the problem that in the prior art, the temporary cable needs to be dynamically adjusted when the lower chord beam in the rigid frame bridge triangular area is constructed, thereby bringing inconvenience to construction.

[0037] Referring to Figures 1 to 4 , in one aspect, the embodiments of the present application provide a construction device for a steel diagonal brace continuous rigid frame bridge triangular area, comprising: a cable mechanism and a support mechanism, the cable mechanism comprising a plurality of temporary cables 4 arranged between a concrete pier column 1 and a steel diagonal brace 3, and the concrete pier column 1 and the steel diagonal brace 3 being rotationally connected; and the support mechanism comprising a plurality of temporary supports 5 vertically arranged between the steel diagonal brace 3 and a concrete main beam 2.

[0038] In actual use, when the prestressed concrete main beam 2 is poured, the load acting on the lower chord beam will change significantly, and a large bending moment will appear in the root section of the lower chord beam. Therefore, when the lower chord beam in the rigid frame bridge triangular area is constructed, the temporary cable 4 often needs to be dynamically adjusted, the construction difficulty is increased, the construction period is increased, and inconvenience is brought to construction. The rotationally connected mode such as hinging is adopted between the concrete pier column 1 and the steel diagonal brace 3, which can facilitate adjustment of the angle between the steel diagonal brace 3 and the concrete pier column 1 according to construction needs, avoids adjustment of the temporary cable 4, makes construction more convenient, reduces the construction monitoring difficulty, realizes convenient adjustment of the internal force of the bridge structure according to the monitoring result, and improves the construction efficiency and construction quality.

[0039] In some optional embodiments, referring to Figure 3 and Figure 4As shown, the embodiment of the present application provides a construction device for the triangular area of a steel-braced continuous rigid frame bridge. The concrete pier column 1 is connected to the steel brace 3 through the hinged device 6. The hanging basket 7 is arranged on the concrete main beam 2. The hinged device 6 is arranged on the outer wall of the concrete pier column 1. The temporary support 5 includes a pre-embedded part, a steel pipe support and a bottom mold. The pre-embedded part is installed on the steel brace 3 and connected to the steel pipe support. The steel pipe support is vertically arranged at the lower end of the concrete main beam 2. The top of the steel pipe support is connected to the bottom mold, which can provide temporary support for the cantilever pouring of the upper chord box girder.

[0040] Referring to Figures 3 to 6 As shown, in another aspect, the embodiment of the present application provides a construction method for the triangular area of a steel-braced continuous rigid frame bridge, which is implemented by using the above-mentioned construction device for the triangular area of a steel-braced continuous rigid frame bridge, and includes the following steps:

[0041] S1, precast each segment of the steel brace 3, complete the construction of the concrete pier column 1 and the initial steel structure segment of the two steel braces 3 on both sides of the longitudinal bridge of the concrete pier column 1, and install the hinged device 6 at the end of the concrete pier column 1;

[0042] S2, construct the initial segment of the upper chord beam at the top end surface of the concrete pier column 1, and install the hanging basket 7 for cantilever pouring of the remaining upper chord beam segments on both sides of the initial segment of the upper chord beam. The hanging basket 7 is movable and can hoist the lower chord steel segment;

[0043] S3, after the hanging basket 7 is installed, the two hanging baskets 7 are moved synchronously in the direction away from the two sides of the initial segment of the upper chord beam, and the upper chord beam segments are poured. The lower chord steel segment is installed synchronously with the upper chord beam, the steel brace 3 is hinged with the initial steel segment, the completed lower chord steel segment is anchored to the temporary stay cable 4 of the concrete pier column 1 in pairs, the lower chord beam segment is used as support, the temporary support 5 is installed to support the upper chord beam segment;

[0044] S4, until the upper chord beam segment and the lower chord beam segment complete the closure of the triangular area, the cross section at the hinged device 6 is solidified, and the temporary stay cable 4 and the temporary support 5 are removed.

[0045] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used for indicating the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0047] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A construction device for a triangular region of a steel braced continuous rigid frame bridge, characterized by, Comprise: a buckle cable mechanism, which comprises a plurality of temporary buckle cables (4) arranged between a concrete pier column (1) and a steel diagonal brace (3), and the concrete pier column (1) and the steel diagonal brace (3) are connected by rotation; a support mechanism, which comprises a plurality of temporary supports (5) arranged vertically between the steel diagonal brace (3) and a concrete main beam (2); the concrete main beam (2) comprises an upper chord beam segment, and the steel diagonal brace (3) comprises a lower chord steel segment, and the lower chord steel segment is installed synchronously with the upper chord beam segment in segments.

2. The construction device of a steel diagonal brace continuous rigid frame bridge triangle area according to claim 1, characterized in that: the concrete pier column (1) and the steel diagonal brace (3) are connected by a hinge device (6).

3. The construction device of a steel diagonal brace continuous rigid frame bridge triangle area according to claim 1, characterized in that: the concrete main beam (2) is provided with a hanging basket (7).

4. The construction device of a steel diagonal brace continuous rigid frame bridge triangle area according to claim 2, characterized in that: the hinge device (6) is arranged on the outer wall of the concrete pier column (1).

5. The construction device of a steel diagonal brace continuous rigid frame bridge triangle area according to claim 3, characterized in that: the temporary support (5) comprises a pre-embedded part, a steel pipe support and a bottom die.

6. The construction device of a steel diagonal brace continuous rigid frame bridge triangle area according to claim 5, characterized in that: the pre-embedded part is installed on the steel diagonal brace (3) and connected with the steel pipe support.

7. The construction device of a steel diagonal brace continuous rigid frame bridge triangle area according to claim 6, characterized in that: the steel pipe support is arranged vertically at the lower end of the concrete main beam (2).

8. The construction device of a steel diagonal brace continuous rigid frame bridge triangle area according to claim 7, characterized in that: the top of the steel pipe support is connected with the bottom die, and the bottom die can provide temporary support for the cantilever pouring of the upper chord box girder.

9. A method for constructing a triangular region of a steel braced continuous rigid frame bridge, characterized in that, The method utilizes the construction device of a steel diagonal brace continuous rigid frame bridge triangle area according to any one of claims 1-8, and the method comprises the following steps: preparing the lower chord steel segments of the steel diagonal brace (3), completing the construction of the concrete pier column (1) and the initial lower chord steel segments of the two steel diagonal braces (3) on both sides of the concrete pier column (1) in the longitudinal bridge direction, and installing the hinge device (6) at the end of the concrete pier column (1); constructing the initial upper chord beam segment on the top end surface of the concrete pier column (1), and installing the hanging basket (7) for cantilever pouring of the remaining upper chord beam segments on both sides of the initial upper chord beam segment, wherein the hanging basket (7) is movable and can hoist the lower chord steel segments; installing the lower chord steel segments synchronously with the upper chord beam segments, hinging the concrete pier column (1) to the initial lower chord steel segments, tensioning and anchoring the temporary buckle cables (4) to the concrete pier column (1) in pairs for the completed lower chord steel segments, installing the temporary supports (5) for supporting the upper chord beam segments with the lower chord steel segments as the support; until the upper chord beam segments and the lower chord steel segments complete the closure of the triangle area, the cross section at the hinge device (6) is solidified, and the temporary buckle cables (4) and the temporary supports (5) are removed. The concrete main girder (2) is composed of upper chord girder segments, and the steel diagonal brace (3) is composed of lower chord steel segments.

10. The construction method of a steel diagonal brace continuous rigid frame bridge triangular area according to claim 9, characterized in that: After the hanging basket (7) is installed, the two hanging baskets (7) are synchronously moved in the direction away from the two sides of the initial upper chord girder segment, and the upper chord girder segment is poured.

Images