Cast-in-place box girder support system crossing operation pressure pipeline

Abstract

The utility model relates to the field of bridge construction, in particular to a crossing operation pressure pipeline cast-in-place box girder support system which comprises a supporting foundation, multi-splicing I-shaped steel, a bailey truss and a disc buckle support. The multi-splicing I-shaped steel is fixedly located on the supporting foundation and arranged in the transverse direction of the bridge. The bailey truss is fixedly located above the multi-splicing I-shaped steel and arranged in the longitudinal direction of the bridge. And the disc buckle bracket is fixedly positioned above the bailey truss. By means of the scheme, the stability and safety of the support system are improved, support deformation is accurately controlled to guarantee the line shape and structural quality of the box girder, extrusion to the pipeline is avoided, and safe and normal operation of the pipeline is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge construction field, concretely relates to cross over operating pressure pipeline cast-in-situ box girder support system. BACKGROUND

[0002] When carrying out cast-in-situ box girder construction, sometimes it is inevitable to cross over operating pressure pipeline, these operating pressure pipelines are for example oil gas pipeline buried in the ground, due to the oil gas pipeline cannot be moved in advance, and is influenced by construction period, cannot wait until the pipeline is moved to carry out bridge construction, therefore must carry out cast-in-situ box girder construction on the ground above the oil gas pipeline.

[0003] When carrying out cast-in-situ box girder construction crossing over operating pressure pipeline, need to erect support on the ground, and the traditional support is full support or simple support combination, and the traditional support system is difficult to meet the safety and construction demand, on the one hand, the pipeline operation safety requirement is high, and the construction cannot cause any damage to it, and the conventional method cannot avoid the potential threat such as collision and extrusion to the pipeline during construction, once the pipeline is damaged, the consequence is unbearable to imagine, on the other hand, in the pipeline crossing area, the support stress is complex, and the traditional support system design is not optimized for this special working condition, and uneven settlement and instability problems are prone to occur. UTILITY MODEL CONTENT

[0004] The utility model intends to provide cross over operating pressure pipeline cast-in-situ box girder support system to improve the stability and safety of support system, accurately control the deformation of support to ensure the box girder linear and structural quality, avoid extrusion to the pipeline, and ensure the safe and normal operation of the pipeline.

[0005] In order to achieve the above object, the utility model adopts the following technical scheme: cross over operating pressure pipeline cast-in-situ box girder support system, including support foundation, multi-spliced I-beam, bailey truss and disc buckle support;Multi-spliced I-beam is fixed on the support foundation, and the multi-spliced I-beam is multiple, and the multi-spliced I-beam is arranged along the bridge transverse direction;Bailey truss is fixed above the multi-spliced I-beam, and the bailey truss is arranged along the bridge longitudinal direction;Disc buckle support is fixed above the bailey truss.

[0006] The principle and advantages of the application scheme are as follows: the support foundation in the application scheme serves as the root of the cross over operating pressure pipeline cast-in-situ box girder support system, can improve the bearing capacity of the foundation, thereby providing stable and reliable support for the whole support system, ensuring that the support system does not have uneven settlement, inclination and other problems under the action of complex geological conditions and construction load, and maintaining the overall stability of the support.

[0007] The multi-spliced I-beam mainly bears the transverse load and plays a role of connecting and distributing the load. The multi-spliced I-beam forms a stable stress structure in the transverse direction of the bridge and is closely connected with the support foundation, effectively transmits and disperses the longitudinal load transmitted from the Bailey frame and the transverse load in the box girder construction process, enhances the transverse stiffness and stability of the support system, and enables the support system to remain stable under the action of the transverse force, thereby avoiding transverse displacement, deformation and the like.

[0008] The Bailey frame in the application is a key structure for bearing the longitudinal load and crossing the pipeline. The Bailey frame has strong bearing capacity in the longitudinal direction of the bridge, can cross a certain distance, effectively avoids the operating pressure pipeline, transmits most of the dead load and the construction live load from the box girder to the multi-spliced I-beam and the support foundation. Meanwhile, the structural form of the Bailey frame can leave a safety space above the pipeline under the premise of ensuring the bearing capacity, reduces the influence of the construction on the pipeline, and ensures the safe operation of the pipeline.

[0009] The disc buckle support is used for building a box girder construction operation platform and supporting a box girder formwork.

[0010] In summary, the scheme of the application improves the stability and safety of the support system, accurately controls the deformation of the support to ensure the linear shape and structural quality of the box girder, avoids extrusion on the pipeline, does not need to move the pipeline, ensures the safe and normal operation of the pipeline, and avoids economic losses and delay of the construction period caused by pipeline accidents. Meanwhile, the support system reduces the safety risks such as collapse of the support and object impact, reduces the probability of safety accidents, and ensures the safety of the construction personnel.

[0011] Preferably, as an improvement, the support foundation comprises a replacement foundation part and an independent foundation part, and the independent foundation part is fixed above the replacement foundation part.

[0012] Therefore, the replacement foundation part in the application is located below the ground, and the independent foundation part is located above the replacement foundation part. The replacement foundation part is more stable underground, and the independent foundation part provides stable and reliable support for the entire support system, uniformly disperses the load transmitted from the upper structure to the foundation, thereby ensuring that the support does not have problems such as uneven settlement and inclination under the action of complex geological conditions and construction load, and maintaining the overall stability of the support to create safe and stable conditions for construction. The independent foundation part effectively bears the upper load and ensures the stability of the support system.

[0013] Preferably, as an improvement, the material of the replacement foundation part is C20 stone concrete, and the material of the independent foundation part is C25 concrete. Therefore, the replacement foundation part and the independent foundation part respectively adopt the above materials, thereby ensuring the structural stability and pressure-bearing capacity of the support foundation.

[0014] Preferably, as an improvement, the multi-spliced I-beam is a four-spliced I-beam.

[0015] Preferably, as an improvement, the disc buckle support comprises horizontal rods, vertical rods and diagonal rods, the horizontal rods and the vertical rods are connected, two horizontal rods and two vertical rods are connected into a rectangular frame; the diagonal rods are connected inside the rectangular frame and serve as the diagonals of the rectangle.

[0016] Preferably, as an improvement, the disc buckle support is provided with horizontal scissors.

[0017] Therefore, the disc buckle support of the present application comprises diagonal rods and is provided with scissors, which greatly enhances the overall stability and spatial stiffness of the support system, can effectively bear various vertical and horizontal loads in the box girder construction process, ensures the position of the formwork fixed during the construction process such as pouring concrete, thereby ensuring the linear and structural size precision of the cast-in-place box girder and improving the construction quality.

[0018] Preferably, as an improvement, the bottom end of the vertical rod is provided with a lower adjustable bracket, and the top end of the vertical rod is provided with an upper adjustable bracket. Both the upper adjustable bracket and the lower adjustable bracket can adjust the length of the vertical rod, so that the length can be adjusted according to the actual situation, and the bottom and top of the vertical rod are connected to other structures more smoothly and stably, ensuring stability.

[0019] Preferably, as an improvement, the top of the upper adjustable bracket is provided with a horizontal main rib, and the horizontal main rib is provided with a secondary rib.

[0020] Preferably, as an improvement, the top of the upper adjustable bracket is provided with an oblique main rib, and the oblique main rib is provided with a secondary rib.

[0021] Preferably, as an improvement, the disc buckle support is connected with a diagonal support rod, the end of the diagonal support rod is connected with a vertical main rib, and the vertical main rib is provided with a secondary rib.

[0022] In the present application, the horizontal main rib is used to support the bottom plate of the box girder, the oblique main rib is used to support the wing plate part of the box girder, and the vertical main rib is used to support the web part of the box girder. The horizontal main rib, the oblique main rib and the vertical main rib are the main load-bearing members, which are usually used to support larger loads, to receive the load transmitted from the upper part and to transmit it to the support point; the secondary rib is located on the main rib and plays the role of strengthening support and sharing load. The main role of the secondary rib is to transmit the load from the upper part to the main rib. The combination of the main rib and the secondary rib ensures the stability, load-bearing capacity and functionality of the entire structure.

[0023] Preferably, as an improvement, the top of the disc buckle support is provided with a horizontal protective net and a temporary edge protection. The protective net is used for safety protection to reduce the falling of construction personnel or objects. The temporary edge protection is convenient for construction personnel to tread. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1Elevation view of the cast-in-place beam support system for crossing the operating pressure pipeline.

[0025] Figure 2 for Figure 1 Cross-sectional view of AA.

[0026] Figure 3 for Figure 1 A close-up view of the bottom of the central buckle plate bracket.

[0027] Figure 4 for Figure 1 A partial enlarged view of the central buckle bracket shows the structure of the horizontal bars, vertical bars, and diagonal bars.

[0028] Figure 5 for Figure 1 A close-up view of the top of the central buckle plate bracket.

[0029] Figure 6 for Figure 2 Enlarged views of the web and flange sections of the box girder.

[0030] Figure 7 for Figure 1 A magnified view of a portion of the supporting foundation. Detailed Implementation

[0031] The following detailed description illustrates the specific implementation method:

[0032] The reference numerals in the accompanying drawings of the instruction manual include: 1. Replacement foundation section; 2. Independent foundation section; 3. Bailey bridge; 4. Disc-lock bracket; 5. Box girder; 6. Four-piece I-beam; 7. Pipe; 8. Horizontal protective net; 9. Edge protection; 10. Dense mesh net; 11. Supporting I-beam; 12. Lower adjustable bracket; 13. Vertical rod; 14. Horizontal rod; 15. Diagonal rod; 16. Horizontal main rib; 17. Secondary rib; 18. Upper adjustable bracket; 19. Diagonal support rod; 20. Diagonal adjustable bracket; 21. Vertical main rib; 22. Diagonal main rib; 23. Scissor brace.

[0033] The basic implementation examples are as follows: Figures 1-7 As shown: The cast-in-place box girder support system spanning the operating pressure pipeline includes the support foundation, multi-section I-beams, Bailey bridge 3, and disc-locked support 4.

[0034] The support foundation in the embodiment is two rows, each of which is provided with a plurality of support foundations, and the plurality of support foundations of the two rows are arranged along the longitudinal direction of the bridge. The two rows of support foundations are opposite. The support foundation specifically comprises a replacement foundation part 1 and an independent foundation part 2, and the independent foundation part 2 is fixedly poured above the replacement foundation part 1. The material of the replacement foundation part 1 in the embodiment is C20 stone concrete, which is buried underground. The arrangement of the replacement foundation part 1 can avoid the softening of the ground soil, thereby stably supporting the independent foundation part 2 and the parts above, and avoiding settlement, and having a large bearing capacity. The material of the independent foundation part 2 is C25 concrete, and the independent foundation part 2 provides stable and reliable support for the entire support system, uniformly disperses the load from the upper structure to the replacement foundation part 1, and ensures that the support system does not have problems such as uneven settlement and inclination under the action of complex geological conditions and construction load, thereby maintaining the stability of the entire support.

[0035] In combination with Figure 2 and Figure 7 , the multi-spliced I-beam in the embodiment is a four-spliced I-beam 6. The four-spliced I-beam 6 is formed by welding four parallel arranged I-beams. Of course, in other embodiments, the multi-spliced I-beam can also be a three-spliced or five-spliced I-beam. The number of the four-spliced I-beams 6 is multiple, and the four-spliced I-beams 6 are located between the two rows of independent foundation parts 2. The end of the four-spliced I-beam 6 is fixed on the independent foundation part 2. Specifically, the independent foundation part 2 is provided with a groove, and the end of the four-spliced I-beam 6 is placed in the groove. Since the four-spliced I-beam 6 is located between the two rows of independent foundation parts 2, the multi-spliced I-beam is arranged along the transverse direction of the bridge. In the embodiment, the four-spliced I-beam 6 is arranged transversely, which plays the role of a cross beam, mainly bears the transverse load and plays the role of connecting and distributing the load. The four-spliced I-beam 6 forms a stable stress structure in the transverse direction of the bridge, is closely connected with the independent foundation part 2, effectively transmits and disperses the longitudinal load from the above beret support 3 and the transverse load in the process of box girder 5 construction, enhances the transverse stiffness and stability of the support system, and makes the support system stable under the action of transverse force, thereby avoiding transverse displacement and deformation. Figure 2 As shown in , by arranging the multi-spliced I-beam, the left and right rows of support foundations do not need to be connected, and the support foundations can be arranged on both sides of the pipeline 7, thereby reducing the extrusion of the support foundations on the pipeline 7 and avoiding damage to the pipeline 7 due to extrusion.

[0036] The bailey truss 3 in the embodiment is fixed (the fixing mode adopts high-strength bolt connection) above the multi-spliced I-beam, and the bailey truss 3 is arranged along the longitudinal direction of the bridge. The bailey truss 3 in the embodiment is a key structure for bearing longitudinal load and spanning the pipeline 7. The bailey truss 3 has strong bearing capacity in the longitudinal direction of the bridge, can span a certain distance, effectively avoids the operating pressure pipeline 7, and transmits most of the dead load and the live load from the box girder 5 to the four-spliced I-beam 6 and the independent foundation part 2. Meanwhile, the structure form of the bailey truss 3 can leave a safety space above the pipeline 7 under the premise of ensuring the bearing capacity, reduces the influence of construction on the pipeline 7, and guarantees the safe operation of the pipeline 7.

[0037] The disc buckle support 4 in the embodiment is fixed (the fixing mode adopts high-strength bolt fixing) above the bailey truss 3. As shown in Figure 4 , the disc buckle support 4 includes a horizontal rod 14, a vertical rod 13 and an inclined rod 15. The horizontal rod 14 and the vertical rod 13 are connected, the horizontal rod 14 and the vertical rod 13 are connected by high-strength bolts, two horizontal rods 14 and two vertical rods 13 are connected into a rectangular frame; the inclined rod 15 is connected inside the rectangular frame and serves as a diagonal line of the rectangle, and the fixing mode of the inclined rod 15 fixed in the rectangular frame also adopts high-strength bolt connection. As shown in Figure 2 , a horizontal scissor brace 23 is arranged on the top of the disc buckle support 4. In the embodiment, the disc buckle support 4 is used for building a box girder 5 construction operation platform and supporting a box girder 5 formwork. The disc buckle support 4 greatly enhances the overall stability and spatial stiffness of the support system by arranging the inclined rod 15 and the scissor brace 23, can effectively bear various vertical and horizontal loads in the construction process of the box girder 5, ensures the position of the formwork of the box girder 5 in the construction process such as pouring concrete, thereby ensuring the linear and structural size precision of the cast-in-place box girder 5 and improving the construction quality. In the embodiment, when the height of the disc buckle support 4 is below 8 m, the continuous horizontal scissor brace 23 is arranged on the top of the disc buckle support 4; when the height of the disc buckle support 4 is 8 m and above, the continuous horizontal scissor brace 23 is arranged on the top, the bottom and the vertical interval of the disc buckle support 4, and the interval is not more than 8 m.

[0038] In addition, the lower adjustable bracket 12 is arranged at the bottom end of the vertical rod 13, and the upper adjustable bracket 18 is arranged at the top end of the vertical rod 13. The upper adjustable bracket 18 and the lower adjustable bracket 12 can adjust the vertical length of the disc buckle support 4 according to the actual situation, thereby adapting to the construction demand.

[0039] As shown in Figure 6As shown in the figure, the top of the upper adjustable bracket 18 is provided with a transverse main beam 16, and a plurality of secondary beams 17 are arranged on the transverse main beam 16, and the transverse main beam 16 and the secondary beams 17 thereon are used to support the bottom plate of the box girder 5. The top of the upper adjustable bracket 18 is provided with an inclined main beam 22, and a plurality of secondary beams 17 are arranged on the inclined main beam 22, and the inclined main beam 22 and the secondary beams 17 thereon are used to support the wing plate part of the box girder 5. The disc buckle support 4 is connected (the connection mode can adopt high-strength bolts) with an inclined support rod 19, the end of the inclined support rod 19 is connected with a vertical main beam 21, the side surface of the vertical main beam 21 is provided with a secondary beam 17, and the vertical main beam 21 and the secondary beam 17 thereon are used to support the web part of the box girder 5, and the inclined support rod 19 is provided with an inclined adjustable bracket 20. The transverse main beam 16, the inclined main beam 22 and the vertical main beam 21 in the embodiment are all I-shaped steel. The secondary beams 17 are all square timbers, the interval between the secondary beams 17 at the web position is 20 cm, the interval between the secondary beams 17 at other positions is 30 cm, the interval between the secondary beams 17 at the outer side of the wing plate and the web is 20 cm, and of course the interval can be set according to different construction conditions.

[0040] The top of the disc buckle support 4 is provided with a horizontal protective net 8 and a temporary edge protection 9. The horizontal protective net 8 is used to play a safety protection role and reduce the falling of construction personnel or objects. The temporary edge protection 9 is convenient for the construction personnel to tread. Meanwhile, the side surface of the temporary edge protection 9 is provided with a dense mesh net 10, so as to protect the personnel from the side.

[0041] In the embodiment, the vertical rod 13 adopts Q355A∅60*3.2mm steel pipe, the horizontal rod 14 adopts Q235B∅48*2.5mm steel pipe, and the inclined rod 15 adopts Q159∅48*2.5mm steel pipe. The interval between the adjacent vertical rods 13 is 60-120cm, and the specific interval is set according to the actual condition. The interval between the adjacent horizontal rods 14 is 120-160cm, and the specific interval is set according to the actual condition. The vertical inclined rod 15 is arranged every 1 span.

[0042] When the support system is built, the cast-in-place work (such as formwork installation, steel bar binding, prestressed pipe 7 installation and concrete pouring) of the box girder 5 is carried out on the top of the support system. After the strength of the poured concrete reaches the design requirement and the prestressed construction is completed, the support system is removed in a specified order, the auxiliary facilities are removed first, and then the support main structure is removed from top to bottom and from the middle of the span to both ends.

[0043] Through the embodiment, the stability and safety of the support system are improved in the cast-in-place box girder 5 construction process, the deformation of the support is accurately controlled to ensure the linear and structural quality of the box girder 5, the extrusion on the pipe 7 is avoided, and the safe and normal operation of the pipe 7 is ensured.

[0044] The support system is suitable for various types of cast-in-situ box girder 5 construction projects crossing operating pressure pipelines 7. It can be used in highway, urban expressway or municipal bridge projects as long as it involves cast-in-situ box girder 5 construction crossing pipelines 7.

[0045] In addition, in some embodiments, in order to improve the stability of the entire support system, reinforcing plates and stiffening ribs are arranged at the connection positions of the Bailey truss 3 and the I-beam, the connection positions of the vertical rods 13 and the cross rods 14 of the disc buckle support 4, etc. The reinforcing plates increase the connection area, making the load transmission more uniform and avoiding stress concentration; the stiffening ribs increase the local stiffness of the nodes like a support structure, enabling the nodes to withstand greater loads. During the construction of the box girder 5, various loads are transmitted through these connection nodes, and the reinforcing plates and stiffening ribs ensure that the nodes do not fail under complex loads, ensuring the bearing performance of the entire support system.

[0046] At the same time, the reinforcing plates and stiffening ribs change the mechanical properties of the nodes, significantly enhancing their ability to resist deformation when subjected to tension, pressure and shear. When the support is subjected to horizontal and vertical loads such as wind force and concrete pouring impact force, these connection nodes can remain relatively stable, preventing the overall structure of the support from losing stability due to node deformation, maintaining the spatial geometry and stability of the support system, and thus ensuring the linear and structural size accuracy of the cast-in-situ box girder 5 during the construction process.

[0047] In combination with Figure 3 As shown in FIG. 1, in other embodiments, support I-beams 11 can also be arranged between the bottom of the disc buckle support 4 and the Bailey truss 3. The number of support I-beams 11 is multiple, and the multiple support I-beams 11 are arranged in parallel and along the bridge transversely. The bottom of the disc buckle support 4 is installed on the top of the support I-beam 11 through high-strength bolts, and the bottom of the support I-beam 11 is installed on the top of the Bailey truss 3 through high-strength bolts. The support I-beam 11 serves as a connecting and force transmitting member, avoiding the top of the Bailey truss 3 having some gaps and being unable to be directly connected with the disc buckle support 4, while the support I-beam 11 bears the pressure of the disc buckle support 4 and transmits the pressure downward to the Bailey truss 3, ensuring the stability and safety of the entire support system and ensuring the smooth progress of the construction.

[0048] The above-mentioned is only an embodiment of the present application, and the specific technical solutions and / or common knowledge of characteristics in the scheme are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in this application should be subject to the content of its claims, and the specific implementation in the specification can be used to explain the content of the claims.

Claims

1. A cast-in-situ box girder support system spanning an operating pressure pipeline, characterized in that: It comprises a support base, multi-spliced I-beams, a Bailey frame and a disc buckle support; the multi-spliced I-beams are fixed on the support base, and the multi-spliced I-beams are multiple and arranged along the transverse direction of the bridge; the Bailey frame is fixed above the multi-spliced I-beams, and the Bailey frame is arranged along the longitudinal direction of the bridge; and the disc buckle support is fixed above the Bailey frame.

2. The support system for cast-in-place box girder of crossing operating pressure pipeline according to claim 1, characterized in that: The support base comprises a replacement foundation part and an independent foundation part, and the independent foundation part is fixed above the replacement foundation part.

3. The support system for cast-in-place box girder of crossing operating pressure pipeline according to claim 2, characterized in that: The material of the replacement foundation part is C20 stone concrete, and the material of the independent foundation part is C25 concrete.

4. The support system for cast-in-place box girder of crossing operating pressure pipeline according to claim 1, characterized in that: The multi-spliced I-beams are four-spliced I-beams.

5. The support system for cast-in-place box girder of operating pressure pipeline according to claim 1, characterized in that: The disc buckle support comprises horizontal rods, vertical rods and inclined rods, the horizontal rods and the vertical rods are connected, two horizontal rods and two vertical rods are connected to form a rectangular frame, and the inclined rods are connected inside the rectangular frame and serve as the diagonal lines of the rectangle.

6. The support system for cast-in-place box girder of crossing operating pressure pipeline according to claim 5, characterized in that: The bottom end of the vertical rod is provided with a lower adjustable bracket, and the top end of the vertical rod is provided with an upper adjustable bracket.

7. The support system for cast-in-place box girder of crossing operating pressure pipeline according to claim 6, characterized in that: The top of the upper adjustable bracket is provided with a horizontal main beam, and the horizontal main beam is provided with a secondary beam.

8. The support system for cast-in-place box girder of crossing operating pressure pipeline according to claim 6, characterized in that: The top of the upper adjustable bracket is provided with an inclined main beam, and the inclined main beam is provided with a secondary beam.

9. The cast-in-place box girder support system spanning operating pressure pipeline according to claim 1, characterized in that: The disc buckle support is connected with an inclined support rod, the end of the inclined support rod is connected with a vertical main beam, and the vertical main beam is provided with a secondary beam.

10. The support system for cast-in-place box girder of operating pressure pipeline according to claim 1, characterized in that: The top of the disc buckle support is provided with a horizontal protective net and a temporary edge protection.

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