Cofferdam inner support structure for bridge construction

Abstract

The utility model discloses a bridge construction cofferdam inner supporting structure which is characterized in that the inner supporting structure comprises inner supporting pipe sets which are symmetrically arranged and inner supporting nodes located at the ends of the inner supporting pipe sets, and each inner supporting node comprises a flange plate connected with the end of the corresponding inner supporting pipe set and a connecting plate set arranged around the center of the flange plate; the connecting plate group is vertically connected with the flange plate, and the inner supporting pipe group is connected with the ring beam through the connecting plate group. According to the utility model, the inner supporting node is arranged as a connecting part and comprises the flange plate and the connecting plate group which are vertically connected, the inner supporting pipe group is connected with the ring beam through the connecting plate group, and the stress of the ring beam is transmitted to the flange plate through the connecting plate group and then is transmitted to the symmetrically arranged inner supporting pipe group. Due to the fact that the flange plates are perpendicular to the connecting plate sets, the flange plates form perpendicular stress faces, ring beam stress in all directions can perpendicularly act on the inner supporting pipe sets, a good stress diffusion effect is provided, stress balance of ring beams is guaranteed, and the overall stability of the cofferdam is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering construction, in particular to an inner support structure of a bridge construction cofferdam. Background Art

[0002] Steel sheet pile cofferdam is currently a very advantageous deep-water foundation cofferdam construction technology. It is widely used in bridge construction and can solve the waterproofing problem in bridge construction. It can provide good construction conditions and improve construction efficiency, thereby ensuring the excellent quality of engineering construction. Patent application No. 201620581362.9 discloses a system for lowering the inner support of a steel sheet pile cofferdam in a deep foundation pit of a bridge. The inner support includes a purlin surrounding each casing and an internal connection system arranged in the purlin. The inner support is provided with at least two layers, and the adjacent two layers of inner supports are connected by a vertical connection system. The outer surface of the inner support purlin forms a guide surface for inserting steel sheet piles. The above patent scheme is a conventional cofferdam structure. In order to simplify the construction process, the purlin and the inner support are often fixed by welding, bolts, etc., resulting in the inability of the two to form a vertical force-bearing surface. The inner support cannot play a sufficient stress diffusion effect, thereby affecting the overall stability of the cofferdam. Summary of the invention

[0003] The utility model aims to solve the shortcomings in the prior art and proposes an inner support structure for a cofferdam in bridge construction.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A bridge construction cofferdam internal support structure includes a ring beam in a rectangular frame structure and an internal support structure located inside the ring beam, characterized in that: the internal support structure includes a symmetrically arranged internal support pipe group and an internal support node located at the end of the internal support pipe group, the internal support node includes a flange plate connected to the end of the internal support pipe group, and a connecting plate group arranged around the center of the flange plate, the connecting plate group is vertically connected to the flange plate, and the internal support pipe group is connected to the ring beam through the connecting plate group.

[0006] Preferably, the ring beam comprises two groups of transverse purlins and longitudinal purlins arranged opposite to each other, the inner support tube group comprises a central tube whose two ends are respectively connected to the midpoints of the two groups of transverse purlins, a central branch tube is connected between the transverse purlins and the central tube, and the central branch tube is arranged in a central symmetrical manner about the ring beam.

[0007] Preferably, the inner support tube group includes an inclined tube whose one end is connected to the quarter point of the longitudinal purlin and the other end is connected to the transverse purlin, and the inclined tube is centrally symmetrically arranged about the ring beam.

[0008] Preferably, the internal support node includes a steel plate located between the flange plate and the end of the internal support tube group, the outer side of the steel plate is evenly distributed with circular holes arranged in an annular pattern, the flange plate is provided with waist-shaped grooves corresponding to the positions of the circular holes, and the steel plate, flange plate and the end of the internal support tube group are connected by bolts.

[0009] Preferably, the connecting plate group includes a main board symmetrically arranged about the center line of the flange plate, and webs and ribs are vertically arranged on the inner and outer sides of the main board respectively. The two main boards are connected by the webs, and the ribs and webs extend from the flange plate toward the end of the main board, and the height of the ribs gradually decreases.

[0010] Preferably, the ribs include main ribs that coincide with the perpendicular bisector of the main board, and supporting ribs arranged on both sides of the main ribs, and the supporting ribs and the webs are arranged at equal intervals from the main ribs.

[0011] Preferably, the ring beam comprises a first steel section and a second steel section stacked up and down, the two steel sections are spliced ​​and fixed to each other, and the two main boards are respectively connected to the side walls of the first steel section and the second steel section, and are respectively located on the horizontal bisectors of the two.

[0012] Preferably, the ribs are respectively connected to the upper part of the first steel section side wall and the lower part of the second steel section side wall, and the webs are simultaneously connected to the lower part of the first steel section side wall and the upper part of the second steel section side wall.

[0013] The utility model has the following beneficial effects:

[0014] The utility model sets an internal support node as a connecting component, including a vertically connected flange plate and a connecting plate group. The internal support pipe group is connected to the ring beam through the connecting plate group. The stress of the ring beam is transmitted to the flange plate through the connecting plate group, and then transmitted to the symmetrically arranged internal support pipe group. Since the flange plate and the connecting plate group are perpendicular to each other, the flange plate forms a vertical force-bearing surface, and the stress of the ring beam in all directions can act vertically on the internal support pipe group, providing a good stress diffusion effect, ensuring the force balance of the ring beam, and improving the overall stability of the cofferdam. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of the internal support structure of the bridge construction cofferdam described in the utility model

[0016] Figure 2 This is a schematic diagram of the assembly of the ring beam and the inner support structure of the utility model

[0017] Figure 3 This is a schematic diagram of the assembly of the ring beam and the connecting plate group of the utility model in the forward installation

[0018] Figure 4 This is a schematic diagram of the assembly of the ring beam and the connecting plate group of the utility model being installed obliquely

[0019] Figure 5This is a schematic diagram of the structure of the internal support node of the utility model

[0020] Description of the drawings: transverse purlin 1, longitudinal purlin 2, central tube 3, central branch tube 4, inclined tube 5, connecting plate group 6, flange plate 7, steel plate 8, main plate 9, web plate 10, main rib plate 11, supporting rib plate 12, waist groove 13, first steel section 14, second steel section 15. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Reference Figures 1 to 5 , an embodiment provided by the utility model:

[0023] A bridge construction cofferdam internal support structure includes a ring beam in a rectangular frame structure and an internal support structure located inside the ring beam, the internal support structure includes a symmetrically arranged internal support pipe group and an internal support node located at the end of the internal support pipe group, the internal support node includes a flange plate 7 connected to the end of the internal support pipe group, and a connecting plate group 6 arranged around the center of the flange plate 7, the connecting plate group 6 is vertically connected to the flange plate 7, and the internal support pipe group is connected to the ring beam through the connecting plate group 6.

[0024] The internal support structure of the bridge construction cofferdam includes a ring beam and an internal support structure. The ring beam is located on the outside and has a rectangular frame structure. The internal support structure is located inside the ring beam, providing a good stress diffusion effect and improving the overall stability of the cofferdam. The internal support structure includes an internal support pipe group and an internal support node. The internal support pipe group is horizontally arranged and horizontally aligned with the ring beam. The internal support node is located at the end of the internal support pipe group and serves as a connecting component between the internal support pipe group and the ring beam. The internal support node includes a flange plate 7 and a connecting plate group 6. The flange plate 7 is connected to the end of the internal support pipe group. The flange plate 7 can be a circular structure. The connecting plate group 6 is arranged around the center of the flange plate 7, and the connecting plate group 6 is vertically connected to the flange plate 7. The internal support pipe group is connected to the ring beam through the connecting plate group 6, the ring beam is welded and fixed to the connecting plate group 6, the connecting plate group 6 is welded and fixed to the flange plate 7, and the flange plate 7 is bolted to the internal support pipe group.

[0025] The utility model sets an internal support node as a connecting component, including a vertically connected flange plate 7 and a connecting plate group 6. The internal support pipe group is connected to the ring beam through the connecting plate group 6. The stress of the ring beam is transmitted to the flange plate 7 through the connecting plate group 6, and then transmitted to the symmetrically arranged internal support pipe group. Since the flange plate 7 and the connecting plate group 6 are perpendicular to each other, the flange plate 7 forms a vertical force-bearing surface, and the stress of the ring beam in all directions can act vertically on the internal support pipe group, providing a good stress diffusion effect, ensuring the force balance of the ring beam, and improving the overall stability of the cofferdam.

[0026] In the present embodiment, preferably, the ring beam comprises two groups of transverse purlins 1 and longitudinal purlins 2 arranged opposite to each other, the inner support tube group comprises a central tube 3 whose two ends are respectively connected to the midpoints of the two groups of transverse purlins 1, a central branch tube 4 is connected between the transverse purlins 1 and the central tube 3, and the central branch tube 4 is arranged in a central symmetrical manner about the ring beam.

[0027] The ring beam includes a transverse purlin 1 and a longitudinal purlin 2. Two groups of transverse purlins 1 are arranged opposite to each other, and two groups of longitudinal purlins 2 are arranged opposite to each other. The transverse purlins 1 and the longitudinal purlins 2 are arranged adjacent to each other and connected at the ends to form a rectangular frame structure. The transverse purlin 1 may correspond to the long side of the ring beam, and the longitudinal purlin 2 may correspond to the short side of the ring beam. The inner support pipe group includes a central pipe 3 and a central branch pipe 4. The central pipe 3 is located on the transverse bisector of the ring beam, and the two ends of the central pipe 3 are respectively connected to the midpoints of the two groups of transverse purlins 1. The central branch pipe 4 is located between the transverse purlin 1 and the central pipe 3, and is arranged symmetrically with respect to the ring beam. One end of the central branch pipe 4 is connected to the central pipe 3, and the other end of the central branch pipe 4 is connected to the transverse purlin 1. The angles between the central branch pipe 4 and the central pipe 3 and the transverse purlin 1 are all 45 degrees, forming an isosceles right triangle structure, providing a good force-bearing effect. By setting the central tube 3, connected to the main stress area of ​​the transverse purlin 1, the force balance is played for the opposite side of the ring beam. By setting the central branch pipe 4, the central tube 3 is supplemented with strength to improve the stability between the transverse purlins 1. When the ring beam is connected to the central tube 3, the ring beam and the connecting plate group 6 are installed in a positive direction.

[0028] In this embodiment, as a preference, the internal support tube group includes an inclined tube 5 having one end connected to the quarter point of the longitudinal purlin 2 and the other end connected to the transverse purlin 1, and the inclined tube 5 is centrally symmetrically arranged about the ring beam.

[0029] The inner support pipe group includes an inclined pipe 5. The inclined pipe 5 is located between the transverse purlin 1 and the longitudinal purlin 2, and is arranged symmetrically about the ring beam, and is correspondingly arranged at the four corners of the ring beam. One end of the inclined pipe 5 is connected to the quarter point of the longitudinal purlin 2, and the quarter point can be a quarter, a half, or three quarters of the length of the longitudinal purlin 2. The other end of the inclined pipe 5 is connected to the transverse purlin 1. The angles between the inclined pipe 5 and the longitudinal purlin 2 and the transverse purlin 1 are both 45 degrees, forming an isosceles right triangle structure, providing a good force effect. By setting the inclined pipe 5, which is connected to the main stress area of ​​the longitudinal purlin 2, the adjacent side of the ring beam plays a force balancing role, and improves the stability between the transverse purlin 1 and the longitudinal purlin 2. When the ring beam is connected to the inclined pipe 5, the ring beam and the connecting plate group 6 are installed at an angle.

[0030] In this embodiment, as a preference, the internal support node includes a steel plate 8 located between the flange plate 7 and the end of the internal support tube group, the outer side of the steel plate 8 is evenly distributed with circular holes arranged in an annular pattern, the flange plate 7 is provided with waist-shaped grooves 13 corresponding to the positions of the circular holes, and the steel plate 8, the flange plate 7 and the end of the internal support tube group are connected by bolts.

[0031] The inner support node includes a steel plate 8. The steel plate 8 is located between the flange plate 7 and the end of the inner support pipe group, and is a circular structure that matches the size of the flange plate 7. A circular hole is arranged on the outer side of the steel plate 8, and the circular holes are evenly arranged around the center of the steel plate 8 and arranged in a ring. A waist-shaped groove 13 is arranged on the outer side of the flange plate 7, and the waist-shaped groove 13 corresponds to the position of the circular hole, and the groove width of the waist-shaped groove 13 is consistent with the diameter of the circular hole. The end of the inner support pipe group can be provided with a flange surface extending outward, and the flange surface is provided with bolt holes corresponding to the circular hole and the waist-shaped groove 13. The bolt is inserted from the waist-shaped groove 13, passes through the circular hole, and then extends from the bolt hole, and is screwed with the nut to achieve the installation and fixation of the steel plate 8, the flange plate 7, and the end of the inner support pipe group. By setting the steel plate 8, the end of the inner support pipe group can be closed to prevent the inner support pipe group from being corroded by water ingress, and at the same time provide a buffer for the connection between the flange plate 7 and the end of the inner support pipe group, improve the fit between the two, and avoid direct damage to the inner support pipe group when the flange plate 7 is deformed, saving maintenance costs. The waist groove 13 is provided to make the flange surface easier to install. When the flange surface undergoes circumferential rotation, extrusion deformation, thermal expansion and contraction, sufficient adjustment space is provided without affecting the stability of the connection.

[0032] In this embodiment, as a preference, the connecting plate group 6 includes a main board 9 symmetrically arranged about the center line of the flange plate 7, and webs 10 and ribs are vertically provided on the inner and outer sides of the main board 9 respectively. The two main boards 9 are connected by the webs 10, and the ribs and webs 10 extend from the flange plate 7 toward the end of the main board 9, and the height of the ribs gradually decreases.

[0033] The connecting plate group 6 includes a main plate 9, a web 10, and a rib plate, which can be fixed by welding or integrally formed. The main plate 9 is symmetrically arranged about the center line of the flange plate 7, and the two main plates 9 can be arranged horizontally, and are symmetrically distributed up and down about the diameter of the flange plate 7, as the main part of the connecting plate group 6. The web 10 and the rib plate are arranged vertically, and are respectively connected to the inner and outer sides of the main plate 9. The web 10 is located between the two main plates 9, and the two main plates 9 are connected by the web 10. One end of the rib plate and the web plate 10 is connected to the flange plate 7, and is vertically connected to the flange plate 7. The other end of the rib plate and the web plate 10 extends toward the end of the main plate 9 and is flush with the end of the main plate 9. The height of the rib plate gradually decreases along the end of the main plate 9. The rib plate starts at the end connected to the flange plate 7, and ends at the end connected to the ring beam. The height of the starting end of the rib plate is greater than the height of the end of the rib plate. The height of the starting end of the rib plate can be equal to the distance from the main plate 9 to the outer edge of the flange plate 7, and the height of the end of the rib plate is equal to the distance from the main plate 9 to the end face of the ring beam. By setting the main plate 9, the web plate 10 and the rib plate, when connected to the side of the ring beam, the main plate 9 serves as the main force-bearing component, and the web plate 10 and the rib plate play a role in supplementing strength and improving stability, ensuring that the stress of the ring beam can act vertically on the flange plate 7, thereby achieving the purpose of vertical force.

[0034] In this embodiment, as a preference, the ribs include a main rib 11 coinciding with a perpendicular bisector of the main board 9 , and supporting ribs 12 arranged on both sides of the main rib 11 , and the supporting ribs 12 and the webs 10 are arranged at equal intervals from the main rib 11 .

[0035] The ribs include main ribs 11 and supporting ribs 12. The main ribs 11 coincide with the perpendicular bisector of the main board 9 and are located at the center line of the connecting plate group 6. The supporting ribs 12 and the webs 10 can be set to two, which are respectively located on both sides of the main ribs 11 and are arranged at equal intervals from the main ribs 11. One end of the main ribs 11, the supporting ribs 12 and the webs 10 is vertically connected to the flange plate 7, and the other ends of the main ribs 11, the supporting ribs 12 and the webs 10 are connected to the ring beam at a certain angle, which can be 90 degrees or 45 degrees. When the internal support node is used in the central tube 3, the central tube 3 forms a 90-degree angle with the transverse purlin 1, the connecting plate group 6 is vertically connected to the side wall of the transverse purlin 1, and the angle between the main ribs 11, the supporting ribs 12, the webs 10 and the ring beam is 90 degrees. When the inner support node is used in the central branch pipe 4, the central branch pipe 4 forms an angle of 45 degrees with the transverse purlin 1, the connecting plate group 6 is connected to the side wall of the transverse purlin 1 at an angle, and the angle between the main rib plate 11, the supporting rib plate 12, the web plate 10 and the ring beam is 45 degrees. When the inner support node is used in the inclined pipe 5, the inclined pipe 5 forms an angle of 45 degrees with the transverse purlin 1 and the longitudinal purlin 2, the connecting plate group 6 is connected to the transverse purlin 1 and the longitudinal purlin 2 at an angle, and the angle between the main rib plate 11, the supporting rib plate 12, the web plate 10 and the ring beam is 45 degrees. By setting the positional relationship between the main rib plate 11, the supporting rib plate 12 and the web plate 10, limiting the equal spacing setting mode, and the inclination angle with the ring beam, the structural stability of the connecting plate group 6 is improved, so that the stress of the ring beam acts evenly on the connecting plate group 6, and its load capacity is further improved.

[0036] In this embodiment, preferably, the ring beam includes a first steel section 14 and a second steel section 15 stacked up and down, which are spliced ​​and fixed to each other, and the two main boards 9 are respectively connected to the side walls of the first steel section 14 and the second steel section 15, and are respectively located on the horizontal bisectors of the two.

[0037] The ring beam includes a first steel section 14 and a second steel section 15. The ring beam adopts a double-jointed structure, and the first steel section 14 and the second steel section 15 are stacked up and down, and the two are spliced ​​and fixed to each other, which can improve the load capacity of the ring beam and ensure its installation strength and stability. The two main boards 9 are respectively connected to the side walls of the first steel section 14 and the second steel section 15, and are respectively located on the horizontal bisectors of the two. By setting the connection relationship of the main board 9, when it is connected and installed with the ring beam of the double-jointed structure, the top and bottom sides of the first steel section 14 and the second steel section 15 can be balanced, and the main board 9 bears the lateral force, which can improve the load capacity and connection stability.

[0038] In this embodiment, preferably, the ribs are respectively connected to the upper part of the side wall of the first steel section 14 and the lower part of the side wall of the second steel section 15 , and the web 10 is simultaneously connected to the lower part of the side wall of the first steel section 14 and the upper part of the side wall of the second steel section 15 .

[0039] The ribs are vertically arranged on the outside of the main board 9, respectively connecting the upper part of the side wall of the first steel section 14 and the lower part of the side wall of the second steel section 15. The web 10 is vertically arranged on the inside of the main board 9, connecting the two main boards 9, and at the same time connecting the lower part of the side wall of the first steel section 14 and the upper part of the side wall of the second steel section 15. By setting the connection relationship between the ribs and the web 10, when connected and installed with the ring beam of the double-jointed structure, the ribs and the web 10 bear the longitudinal force, which can improve the load capacity and connection stability. In addition, the installation stability between the first steel section 14 and the second steel section 15 is improved, the splicing and fixing are more reliable, and it is ensured that the stress of both can act evenly on the connecting plate group 6.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An internal support structure for a bridge construction cofferdam, comprising a ring beam in a rectangular frame structure, and an internal support structure located inside the ring beam, Features: The internal support structure includes a symmetrically arranged internal support tube group and an internal support node located at the end of the internal support tube group. The internal support node includes a flange plate connected to the end of the internal support tube group and a connecting plate group arranged around the center of the flange plate. The connecting plate group is vertically connected to the flange plate, and the internal support tube group is connected to the ring beam through the connecting plate group.

2. A bridge construction cofferdam internal support structure according to claim 1, Features: The ring beam comprises two groups of transverse purlins and longitudinal purlins arranged opposite to each other, the inner support pipe group comprises a central pipe whose two ends are respectively connected to the midpoints of the two groups of transverse purlins, a central branch pipe is connected between the transverse purlins and the central pipe, and the central branch pipe is arranged in a central symmetric manner about the ring beam.

3. A bridge construction cofferdam internal support structure according to claim 2, Features: The inner support pipe group comprises an inclined pipe whose one end is connected to the quarter point of the longitudinal purlin and the other end is connected to the transverse purlin. The inclined pipe is centrally symmetrically arranged about the ring beam.

4. A bridge construction cofferdam internal support structure according to claim 1, Features: The inner support node includes a steel plate located between the flange plate and the end of the inner support tube group. The outer side of the steel plate is evenly distributed with circular holes arranged in an annular pattern. The flange plate is provided with waist-shaped grooves corresponding to the positions of the circular holes. The steel plate, the flange plate and the end of the inner support tube group are connected by bolts.

5. The inner support structure of the bridge construction cofferdam according to claim 1, Features: The connecting plate group includes a main board symmetrically arranged about the center line of the flange plate, and webs and ribs are vertically arranged on the inner and outer sides of the main board respectively. The two main boards are connected by the webs, and the ribs and webs extend from the flange plate toward the end of the main board, and the height of the ribs gradually decreases.

6. A bridge construction cofferdam internal support structure according to claim 5, Features: The ribs include a main rib that coincides with a perpendicular bisector of the main plate, and supporting ribs arranged on both sides of the main rib, and the supporting ribs and the webs are arranged at equal intervals from the main ribs.

7. The inner support structure of the cofferdam for bridge construction according to claim 5, Features: The ring beam comprises a first steel section and a second steel section stacked up and down, the two steel sections are spliced ​​and fixed to each other, and two main boards are respectively connected to the side walls of the first steel section and the second steel section, and are respectively located on the horizontal bisecting planes of the two sections.

8. The inner support structure of the cofferdam for bridge construction according to claim 7, Features: The ribs are respectively connected to the upper part of the first steel side wall and the lower part of the second steel side wall, and the webs are simultaneously connected to the lower part of the first steel side wall and the upper part of the second steel side wall.

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