Bridge hollow thin-wall high pier manhole middle partition plate laminated structure and construction method

Abstract

According to the bridge hollow thin-wall high pier manhole middle partition plate superposed structure and the construction method, after a hollow thin-wall high pier body is poured to a middle partition plate construction area, according to the construction requirement of a middle partition plate reserved manhole, a bottom formwork is divided into four pieces to be prefabricated and poured, the four bottom formworks are provided with embedded steel bars before prefabrication, the embedded steel bars are evenly spaced, and the prefabricated steel bars are embedded in the middle partition plate; the components are symmetrically arranged; reserved steel bar holes are formed in the four bottom formworks; the four bottom formworks are provided with pre-buried T-shaped steel beams with holes, the bottom formworks are connected with one another through anchor bolts, hollow round pipes are welded to the upper portions of the T-shaped steel beams with holes, and the hollow round pipes are inserted into horizontal round pipes and then connected to the independent triangular supporting frames at the two ends in a lap joint mode, so that the bottom formworks are connected with the pier body; according to the method, the integrity and continuity of the hollow thin-wall high pier structure of the bridge during segmented multi-time pouring are guaranteed, when the middle partition plate and the main body structure are stressed together, higher energy is provided for dissipating energy, the damage degree of the structure is reduced, and the safety of the structure is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering construction, and particularly to a laminated structure and construction method of a manhole middle partition for a hollow thin-walled high pier of a bridge. Background Technique

[0002] The development of bridges in the transportation field can be traced back to ancient times. With the development of human society, the design and construction of bridges have been continuously innovated and improved. Modern bridge technologies have been very developed, including various types such as suspension bridges, cable-stayed bridges, arch bridges, and steel truss bridges; the construction of these bridges has not only improved people's travel conditions but also promoted economic and social development. Bridge construction has become an indispensable part of the urbanization process. In order to improve the efficiency and quality of bridge construction, we have explored more innovative construction methods.

[0003] Currently, the construction of the hollow thin-walled high pier structure of a bridge adopts the method of segmental multi-time pouring. This method can increase the structural strength and durability of concrete; control the temperature and stress of concrete during construction to avoid cracks and deformations; reduce the usage of formwork and supports and lower the construction cost. However, when pouring the middle partition, if the embedded I-shaped corbel steel is used as the formwork support, there are problems such as narrow construction space inside the pier, difficult disassembly of the bottom formwork, high safety risks, and long construction period after pouring; if the precast middle partition is hoisted, considering the on-site construction conditions and space limitations, the requirements for on-site construction are high, and the connection between the middle partition and the pier may also affect the stability and safety of the bridge.

[0004] In view of this, considering the tight connection between each paragraph and taking appropriate measures to ensure the stability and consistency of the entire high pier structure, a laminated structure and construction method of a manhole middle partition for a hollow thin-walled high pier of a bridge are proposed to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a laminated structure and construction method of a manhole middle partition for a hollow thin-walled high pier of a bridge, so that when the middle partition and the main structure are stressed together, it has higher energy for dissipating energy, reduces the degree of structural damage, and improves the safety of the structure, and can effectively solve the problems in the background technique.

[0006] To achieve the above object, the present invention provides the following technical solutions: A composite structure and construction method for the manhole middle partition of a hollow thin-walled high pier of a bridge, including a pier body, a bottom formwork, and an inner formwork. A chamfer is provided on the inner wall of the pier body, and the bottom formwork is arranged at the pier body and the chamfer. The bottom formwork is composed of an external bottom formwork I, an external bottom formwork II, an internal bottom formwork I, and an internal bottom formwork II. Among them, the internal bottom formwork I and the internal bottom formwork II are cast into a concave shape so that they are spliced together to form a reserved manhole. Perforated T-shaped steels are respectively embedded between the adjacent formworks of the external bottom formwork I, the external bottom formwork II, the internal bottom formwork I, and the internal bottom formwork II, and the hole positions on the perforated T-shaped steels are aligned with each other. The perforated T-shaped steels are connected by a number of anchor bolts. The exposed part at the top of the anchor bolt is welded with a hollow ring, and a horizontal round tube passes through the hollow ring. Support components are respectively arranged between the two ends of the horizontal round tube and the pier body. The inner formwork is arranged at the reserved manhole, and a number of rows of hollow steel rings are horizontally welded on the inner wall of the inner formwork. Round steel tubes are sleeved on the hollow steel rings corresponding to the inner formwork in the horizontal direction, and lifting rings are welded on the round steel tubes and the inner formwork respectively.

[0007] Further, the upper surface of the bottom formwork is a rough surface with unevenness. A steel bar framework is tied above the bottom formwork, and reserved steel bar holes are arranged around the upper surface of the bottom formwork. The hole positions of the reserved steel bar holes correspond to the positions of the steel bars on the inner side of the pier body.

[0008] Further, the diameter of the round steel tube is smaller than the diameter of the hollow steel ring, and it is vertically bent downward at the hollow steel ring and tightly sleeved on the hollow steel ring, arranged in a cross pattern. The round steel tube and the hollow steel ring form a support structure for the inner formwork, and angle steels are welded between the assembly gaps of the inner formwork.

[0009] Further, before prefabrication, embedded steel bars are provided on the bottom formwork. The embedded steel bars include a number of upper-layer main steel bars and lower-layer main steel bars in the transverse direction, and they are evenly spaced; a number of stirrups are tied around the upper-layer main steel bars and the lower-layer main steel bars, distributed equidistantly in the transverse direction of the upper-layer main steel bars and the lower-layer main steel bars, and a number of peripheral shear studs and internal shear studs are welded along the longitudinal shear direction of the upper-layer main steel bars and the lower-layer main steel bars. The lower ends of the peripheral shear studs and the internal shear studs respectively hook the lower-layer main steel bars, the upper ends of the peripheral shear studs are welded with shear stud rods, and the upper ends of the internal shear studs are welded with auxiliary lifting hooks.

[0010] Further, a circle of anchor bolts is embedded at the reserved manhole of the internal bottom formwork I and the internal bottom formwork II. The perforated angle steel is inserted onto the embedded anchor bolts, and the perforated angle steel and the anchor bolts are fixed into one body with nuts and the bottom formwork. The inner formwork is erected on the perforated angle steel, and a solid angle steel is welded at the lower end of the inner formwork and is in close contact with the perforated angle steel.

[0011] Further, the support component includes an independent triangular support frame and a semi-circular steel bar, and the semi-circular steel bar is welded at the upper end of the independent triangular support frame.

[0012] Compared with the prior art, the beneficial effects of the present invention are: The present invention ensures the integrity and continuity of the hollow thin-walled high pier structure of the bridge during segmented multi-time pouring. When the middle partition is stressed together with the main structure, it has higher energy for dissipating energy, reduces the degree of structural damage, and improves the structural safety; at the same time, during the construction of the middle partition, the use of formwork is greatly reduced, the problem that the formwork is difficult to remove in traditional construction is solved, the time and economic costs are saved to a great extent, and the construction safety and efficiency are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the connection structure between the bottom formwork and the pier body of the present invention; Figure 2 It is a schematic diagram of the bottom formwork structure of the present invention; Figure 3 It is a schematic cross-sectional structure diagram of the external bottom formwork I and the external bottom formwork III of the present invention; Figure 4 It is a schematic longitudinal section structure diagram of the external bottom formwork I of the present invention; Figure 5 It is a schematic cross-sectional structure diagram of the external bottom formwork III and the reserved manhole of the present invention; Figure 6 It is a schematic diagram of the independent triangular support frame structure of the present invention; Figure 7 It is a schematic diagram of the connection structure among the external bottom formwork III, the steel bar cage, the internal formwork and the round steel pipe of the present invention; Figure 8 It is a schematic top view structure diagram of the connection among the bottom formwork, the internal formwork and the round steel pipe of the present invention; Figure 9 It is a schematic diagram of the support structure of the round steel pipe at the reserved manhole for the internal formwork of the present invention.

[0014] In the figure: 1 pier body, 2 chamfer, 3 upper layer main steel bars, 4 lower layer main steel bars, 5 stirrups, 6 surrounding shear studs, 7 internal shear studs, 8 shear stud rods, 9 auxiliary lifting hooks, 10 T-shaped steel with holes, 11 anchor bolts, 12 hollow rings, 13 anchor rods, 14 angle steel with holes, 15 nuts, 16 rough surface, 17 horizontal round pipes, 18 independent triangular support frames, 19 semi-circular steel bars, 20 steel bar cages, 21 solid angle steel, 22 reserved steel bar holes, 23 hollow steel rings, 24 round steel pipes, 25 lifting rings, 25 lifting rings, 26 angle steel, 27 reserved manholes, 28 external bottom formwork I, 29 external bottom formwork II, 30 internal bottom formwork I, 31 internal bottom formwork II, 32 internal formwork. EMBODIMENTS

[0015] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0016] Please refer to Figures 1-9 , the present invention provides a technical solution: a laminated structure and construction method for the manhole middle partition of a hollow thin-walled high pier of a bridge, including a pier body 1, a bottom formwork and an inner formwork 32. A chamfer 2 is provided on the inner wall of the pier body 1. The bottom formwork is arranged at the pier body 1 and the chamfer 2. The middle partition is provided with a reserved manhole 27 in the middle according to the design requirements. Therefore, the bottom formwork is divided into four precast formworks for pouring according to the shape and size. Among them, the external bottom formwork I 28 and the external bottom formwork II 29 are poured into strip shapes, and the internal bottom formwork I 30 and the internal bottom formwork II 31 are poured into concave shapes so as to be spliced to reserve the manhole 27; the bottom formwork is provided with embedded steel bars before precasting, including a number of upper transverse main steel bars 3 and lower main steel bars 4, which are evenly spaced and symmetrically arranged; a number of stirrups 5 are tied around the upper main steel bars 3 and the lower main steel bars 4, and are equally spaced in the transverse direction of the upper main steel bars 3 and the lower main steel bars 4. A number of peripheral shear studs 6 and internal shear studs 7 are welded along the longitudinal shear direction of the upper main steel bars 3 and the lower main steel bars 4. The lower ends of the peripheral shear studs 6 and the internal shear studs 7 respectively hook the lower main steel bars 4. A shear stud rod 8 is welded to the upper end of the peripheral shear stud 6, and an auxiliary lifting hook 9 is welded to the upper end of the internal shear stud 7; reserved steel bar holes 22 are provided around the upper surface of the bottom formwork, and the hole positions of the reserved steel bar holes 22 correspond to the positions of the steel bars inside the pier body 1.

[0017] An independent triangular support frame 18 and a semi-circular steel bar 19 form a support assembly. The semi-circular steel bar 19 is welded to the upper end of the independent triangular support frame 18. The support assemblies are respectively arranged between the two ends of the horizontal circular pipe 17 and the pier body 1 to play a supporting role.

[0018] In addition, adjacent bottom formworks are both pre-embedded with perforated T-shaped steel 10 and made to be in close contact with each other. Align the hole positions on the perforated T-shaped steel 10. After ensuring that the bottom surfaces of the two bottom formworks are flush, use a number of anchor bolts 11 to make the perforated T-shaped steel 10 fit tightly. Weld a hollow ring 12 to the exposed part at the top of the perforated T-shaped steel 10. Particularly, a circle of anchor rods 13 is pre-embedded at the reserved manhole 27 of the internal bottom formwork I 30 and internal bottom formwork II 31 in the middle. Insert the perforated angle steel 14 onto these pre-embedded anchor rods 13, and use nuts 15 to fix the perforated angle steel 14 and the bottom formwork into one body. Finally, place the bottom formwork skeleton of the obtained bottom formwork on the mold, lay a felt cloth under the bottom formwork skeleton before pouring concrete, and form an uneven rough surface 16 on the surface of the formwork after pouring concrete. After demolding and curing, obtain the bottom formwork b.

[0019] A number of rows of hollow steel rings 23 are horizontally welded to the inner wall of the inner formwork 32, and the spacing is uniform. The rows of hollow steel rings 23 are symmetrically arranged on the opposite inner wall of the inner formwork 32. A round steel pipe 24 is sleeved on each row of hollow steel rings 23 on the inner formwork 32 and the hollow steel rings 23 on the opposite inner formwork 32 that are horizontally opposite. And it is vertically bent downward at the hollow steel rings 23 and tightly sleeved on the hollow steel rings 23, showing a cross arrangement, constituting the support of the inner formwork. Vertical lifting rings 25 are welded on the round steel pipe 24 and the inner formwork 32, so that after pouring concrete, first directly lift away the round steel pipe 24, and then lift away the inner formwork 32. Angle steel 26 is welded at the gaps during the assembly of the inner formwork 32 to prevent leakage during concrete pouring.

[0020] A construction method for a manhole middle partition laminated structure of a bridge hollow thin-walled high pier includes the following steps: Step 1, pour the pier body 1 of the hollow thin-walled high pier to the construction area of the middle partition, and set a chamfer 2 on the inner wall of the pier body 1. The steel bars of the pier body 1 are exposed upward along the lower pier body. Step 2, lift the prefabricated bottom formwork to the already poured pier body 1 and chamfer 2, pass a number of horizontal round pipes 17 through the hollow rings 12, place independent triangular support frames 18 at both ends of the horizontal round pipes 17, and lap both ends of the horizontal round pipes 17 on the semi-circular steel bars 19. Step 3, bind the horizontal exposed steel bars of the bottom formwork with the vertical exposed steel bars of the pier body 1, and bind the steel bar skeleton 20 of the bottom formwork with the vertical exposed steel bars of the pier body 1. Step 4, erect the inner formwork 32 at the reserved manhole 27. The inner formwork 32 is directly erected on the perforated angle steel 14, and the solid angle steel 21 at the lower end of the inner formwork 32 is in close contact with the perforated angle steel 14. Step Five: Horizontally weld several rows of hollow steel rings 23 on the inner wall of the inner formwork 32 at uniform intervals. The rows of hollow steel rings 23 are symmetrically arranged on the opposite inner wall of the inner formwork 32. A round steel pipe 24 is sleeved on each row of hollow steel rings 23 and the hollow steel rings 23 on the opposite inner formwork 32 at the same horizontal level. The round steel pipe 24 is vertically bent downward at the hollow steel rings 23 and tightly sleeved on the hollow steel rings 23, showing a cross arrangement. Step Six: Pour concrete on the bottom formwork to cover the steel reinforcement cage 20, the horizontally exposed steel bars of the bottom formwork, and the vertically exposed steel bars of the pier shaft 1, so that the three are integrally cast to form the middle partition and part of the pier shaft. Step Seven: After the concrete hardens, remove the horizontal round pipe 17, the independent triangular support frame 18, the round steel pipe 24, and the inner formwork 32. They can be reused after the subsequent pier shaft 1 is cast with concrete. The bottom formwork remains in place and bears the load together with the structure. Step Eight: After the middle partition hardens, cut off the redundant steel bars and continue to pour the upper pier shaft.

[0021] The above shows and describes the basic principles, main features, and advantages of the present invention. Without departing from the spirit and scope of the present invention, the present invention has various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A laminated structure of the middle partition plate of the manhole in the hollow thin-walled high pier of a bridge, comprising a pier body (1), a bottom formwork and an inner formwork (32), characterized in that: The inner wall of the pier shaft (1) is provided with a chamfer (2). The bottom formwork is arranged at the pier shaft (1) and the chamfer (2). The bottom formwork is composed of an external bottom formwork I (28), an external bottom formwork II (29), an internal bottom formwork I (30) and an internal bottom formwork II (31). Among them, the internal bottom formwork I (30) and the internal bottom formwork II (31) are cast into a concave shape so that they are spliced to form a reserved manhole (27). Between the adjacent formworks of the external bottom formwork I (28), the external bottom formwork II (29), the internal bottom formwork I (30) and the internal bottom formwork II (31), perforated T-shaped steels (10) are respectively embedded, and the hole positions on the perforated T-shaped steels (10) are aligned with each other. The perforated T-shaped steels (10) are connected by a number of anchor bolts (11). The exposed part at the top of the anchor bolt (11) is welded with a hollow ring (12). A horizontal circular pipe (17) passes through the hollow ring (12). Support assemblies are respectively arranged between the two ends of the horizontal circular pipe (17) and the pier shaft (1). An inner formwork (32) is arranged at the reserved manhole (27). A number of rows of hollow steel rings (23) are horizontally welded on the inner wall of the inner formwork (32). Circular steel pipes (24) are sleeved on the horizontally corresponding hollow steel rings (23) of the inner formwork (32). Lifting rings (25) are respectively welded on the circular steel pipes (24) and the inner formwork (32).

2. The laminated structure of the manhole middle partition of the hollow thin-walled high pier of a bridge according to claim 1, wherein: The upper surface of the bottom formwork is a rough surface (16) with unevenness. A steel bar framework (20) is tied above the bottom formwork. Reserved steel bar holes (22) are arranged around the upper surface of the bottom formwork. The hole positions of the reserved steel bar holes (22) correspond to the positions of the steel bars on the inner side of the pier shaft (1).

3. A laminated structure of the middle partition of the manhole of a hollow thin-walled high pier of a bridge according to claim 1, characterized in that: The diameter of the circular steel pipe (24) is smaller than that of the hollow steel ring (23), and it is vertically bent downward at the hollow steel ring (23) and tightly sleeved on the hollow steel ring (23), showing a cross arrangement. The circular steel pipe (24) and the hollow steel ring (23) form a support structure of the inner formwork (32). Angle steels (26) are welded between the splicing gaps of the inner formwork (32).

4. A manhole middle partition laminated structure for a hollow thin-walled high pier of a bridge according to claim 1, characterized in that: Before prefabrication, embedded steel bars are arranged on the bottom formwork. The embedded steel bars include a number of upper layer main bars (3) and lower layer main bars (4) in the transverse direction, and they are evenly spaced; a number of stirrups (5) are tied around the upper layer main bars (3) and the lower layer main bars (4), and are evenly distributed at equal distances in the transverse direction along the upper layer main bars (3) and the lower layer main bars (4). A number of peripheral shear studs (6) and internal shear studs (7) are welded along the longitudinal shear direction of the upper layer main bars (3) and the lower layer main bars (4). The lower ends of the peripheral shear studs (6) and the internal shear studs (7) respectively hook the lower layer main bars (4). The upper end of the peripheral shear stud (6) is welded with a shear stud rod (8). The upper end of the internal shear stud (7) is welded with an auxiliary lifting hook (9).

5. A laminated structure of the middle partition plate of the manhole in the hollow thin-walled high pier of a bridge according to claim 1, characterized in that: A circle of anchor rods (13) is embedded at the reserved manhole (27) of the internal bottom formwork I (30) and the internal bottom formwork II (31). The perforated angle steel (14) is inserted onto the embedded anchor rod (13). The perforated angle steel (14) and the anchor rod (13) are fixed into a whole with nuts (15) and the bottom formwork. The inner formwork (32) is erected on the perforated angle steel (14). A solid angle steel (21) is welded at the lower end of the inner formwork (32) and is in close contact with the perforated angle steel (14).

6. The laminated structure of the middle partition plate of the manhole of the hollow thin-wall high pier of the bridge according to claim 1, characterized in that: The support component includes an independent triangular support frame (18) and a semi-circular steel bar (19), and the semi-circular steel bar (19) is welded to the upper end of the independent triangular support frame (18).

7. A construction method for the laminated structure of the middle partition plate of the manhole in the hollow thin-walled high pier of a bridge, characterized in that: Adopting a laminated structure of a manhole middle partition for a hollow thin-wall high pier of a bridge as described in any one of claims 1 to 6, the following steps are included: Step 1, pour the pier body (1) of the hollow thin-wall high pier to the construction area of the middle partition, and set chamfers (2) on the inner wall of the pier body (1). The steel bars of the pier body (1) are exposed upward along the lower pier body; Step 2, lift the prefabricated bottom formwork to the cast pier body (1) and the chamfer (2), pass a number of horizontal round tubes (17) through the hollow ring (12), place the two ends of the horizontal round tube (17) on the independent triangular support frame (18) respectively, and the two ends of the horizontal round tube (17) are respectively lapped on the semi-circular steel bar (19); Step 3, bind the horizontally exposed steel bars of the bottom formwork with the vertically exposed steel bars of the pier body (1), and bind the steel bar framework 20 of the bottom formwork with the vertically exposed steel bars of the pier body (1); Step 4, erect an inner formwork (32) at the reserved manhole (27). The inner formwork (32) is directly erected on the perforated angle steel (14), and the solid angle steel (21) at the lower end of the inner formwork (32) is in close contact with the perforated angle steel (14); Step 5, horizontally weld several rows of hollow steel rings (23) on the inner wall of the inner formwork (32) with uniform spacing, and arrange rows of hollow steel rings (23) symmetrically on the opposite inner wall of the inner formwork (32). A round steel pipe (24) is sleeved on each row of hollow steel rings (23) and the hollow steel rings (23) on the opposite inner formwork (32) horizontally, and is vertically bent downward at the hollow steel ring (23) and tightly sleeved on the hollow steel ring (23), showing a cross arrangement; Step 6, pour concrete on the bottom formwork to cover the steel bar framework (20), the horizontally exposed steel bars of the bottom formwork and the vertically exposed steel bars of the pier body (1), so that the three are integrally poured to form the middle partition and part of the pier body; Step 7, after the concrete hardens, remove the horizontal round tube (17), the independent triangular support frame (18), the round steel pipe (24) and the inner formwork (32), and reuse them after the subsequent section of the pier body (1) is poured with concrete. The bottom formwork is left in place to jointly bear the force with the structure; Step 8, after the middle partition hardens, cut off the redundant steel bars and continue to pour the upper pier body.

Images