Construction method of large diameter variable cross-section hollow cast-in-place concrete cylindrical pier

Abstract

The invention relates to a construction method for a large-diameter variable-section hollow cast-in-place concrete cylindrical pier. The construction process of the large-diameter variable-section hollow cast-in-place concrete cylindrical pier is innovative. The outer plate of the integral top formwork and inner formwork system can be adjusted according to the requirements of different cross-sectional sizes of the pier column, and the inner formwork does not need to be removed, thereby reducing the construction cost and improving the construction efficiency. The steel bar precise positioning in-situ binding frame system is provided with columns both inside and outside, and the rigidity of the steel bar binding frame can be improved by rigid inner support rods and rigid outer support rods, thereby reducing the safety hazards of construction. The column top-variable cross-section-cavity top ring pipe combined spray curing system effectively solves the problem of concrete surface cracking that may be caused by uneven artificial watering, and the construction effect is remarkable. The annular attached formwork scaffolding system is convenient to construct, simple to operate, and has a reasonable force form, and has good technical and economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of highway bridges, and in particular relates to a construction method for a large-diameter variable-section hollow cast-in-place concrete cylindrical pier. Background Art

[0002] In bridge construction, cast-in-place concrete pier construction is a key link. As the lower structure of the bridge, the cast-in-place concrete pier bears the bridge deck load and is also affected by river impact, corrosion and earthquake, which is related to the service life. Therefore, accurately mastering the construction technology of cast-in-place concrete piers is the key to ensuring the quality of road construction.

[0003] There are two main methods for the construction of large-section piers: cast-in-place and prefabrication. Prefabrication is mostly used in projects with harsh construction environments and difficult logistical supplies, and most piers are still cast-in-place. The advantages of cast-in-place are strong integrity and high durability of piers, but the construction period is longer than prefabrication. There are many problems with the current construction technology of cast-in-place concrete piers for roads and bridges. For example, it is difficult to control cracks in cast-in-place concrete piers, and the appearance is prone to defects such as pockmarks, honeycombs, exposed reinforcement, and leakage. These problems are particularly common in the casting of large-section piers, and the casting technology of concrete piers needs to be improved and perfected.

[0004] For the construction of large-diameter variable-section hollow cast-in-place concrete cylindrical piers, it is urgent to propose a construction method that can improve construction efficiency while ensuring project quality and safety. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a construction method for a large-diameter variable-section hollow cast-in-situ concrete cylindrical pier.

[0006] This large-diameter variable-section hollow cast-in-place concrete cylindrical pier construction method includes the following construction steps:

[0007] S1. Install the integral top mold and non-disassembly inner mold system and adjust the adjustable outer panel;

[0008] S2. Install the steel bar to accurately position the in-situ tyre frame system, construct the internal support columns and fixed pillars, complete the internal and external support tyre frame, and finally set up the steel cage of the variable-section cylindrical pier;

[0009] S3. Install the external mold-rebar cage verticality precise positioning detection system so that the laser emitting end and the laser receiving end are connected to the external components; install the laser emitter and the laser receiving surface layer;

[0010] S4. After pouring the variable-section cylindrical pier, install the column top-variable-section-cavity top ring pipe spray curing system, and use the electric winch to drive the spray frame up and down to spray and cure the variable-section cylindrical pier;

[0011] S5. A ring-shaped scaffolding system is installed on the outside of the pier formwork of the variable-section cylindrical pier.

[0012] Preferably, the integral top mold non-disassembly inner mold system includes an inner mold non-disassembly maintenance system and an outer mold adjustment system, wherein the inner mold non-disassembly maintenance system includes an inner mold non-disassembly and an annular spray curing pipe on the variable-section cylindrical pier; the outer mold adjustment system includes a fixed plate, an adjustable outer plate, tension screws and an adjustment flange; in step S1, firstly, holes are reserved on the fixed plate, and then the non-disassembly inner mold, the fixed plate and the adjustable outer plate are set up, and then the tension screws and the adjustment flange are installed, and the adjustable outer plate is adjusted to meet the construction requirements of variable-section cylindrical piers with different cross-sections, and after the construction is formed, an annular spray curing pipe is arranged on the variable-section cylindrical pier.

[0013] Preferably, the steel bar precise positioning and in-situ binding frame system includes built-in support columns and rigid inner support rods installed in the steel bar cage, and the rigid inner support rods are supported between the built-in support columns and the steel bar cage; the steel bar cage includes longitudinal reinforcement and hoop reinforcement, and the outside of the steel bar cage is connected to a fixed column through a rigid outer support rod and a support rod tray, and the fixed column is provided with a first column clamp and a second column clamp for connecting the rigid outer support rod.

[0014] Preferably, in step S2, built-in supporting columns and fixed columns are pre-fabricated, and then the rigid inner support rods, the first column clamp, the second column clamp, the rigid outer support rods and the support rod tray are installed, and finally the longitudinal reinforcement and stirrup reinforcement of the steel cage are set up.

[0015] Preferably, the external mold-rebar cage verticality precise positioning detection system comprises a laser emitting end and a laser receiving end, both of which are connected to the external component by fixing screws, adjusting nuts and U-shaped rods; the laser emitting end comprises a bracket cross bar, a bracket diagonal rod, a bracket vertical rod, a transmitter suspension rod and a laser emitter; the laser receiving end comprises a bracket vertical rod, a laser receiving rod and a laser receiving surface layer; in step S3, the laser emitter is fixed to the inner side of the bracket cross bar by the transmitter suspension rod, and when the laser receiving end is applied, the laser receiving rod is welded on the bracket vertical rod and the laser receiving surface layer is installed.

[0016] Preferably, the column top-variable section-cavity top ring tube spray curing system includes an electric lifting system and a spray curing system, the electric lifting system includes a pedestal, an operating platform, an electric winch, steel ropes and lifting ears; the spray curing system includes a spray rack, a spray head, a water inlet pipe and a water storage tank; in step S4, firstly, a pedestal and an operating platform are set up on the road surface and an electric winch is placed thereon, the electric winch drives the spray rack connected by the steel rope and the lifting ear, and then the spray head is installed on the spray rack and connected to the water storage tank through the water inlet pipe, and the up and down movement of the spray head can perform spray curing on variable-section cylindrical piers of different cross-sectional sizes.

[0017] Preferably, the annular formwork scaffolding system includes a scaffolding, which is erected outside the pier formwork of the variable-section cylindrical pier. The scaffolding includes cross bars, vertical bars and cross connecting rods, and the cross bars, vertical bars and cross connecting rods of the scaffolding are combined and assembled with the pier formwork of the variable-section cylindrical pier.

[0018] A large-diameter variable-section hollow cast-in-situ concrete cylindrical pier is obtained by any of the above-mentioned methods.

[0019] The beneficial effects of the present invention are:

[0020] 1) The outer plate of the integral top formwork and the inner formwork system of the present invention can be adjusted according to the requirements of different cross-sectional sizes of the variable-section cylindrical pier, and the inner formwork does not need to be removed, which can reduce the construction cost and improve the construction efficiency.

[0021] 2) The steel bar precise positioning in-situ binding frame system of the present invention is provided with columns both inside and outside, and the rigidity of the steel bar binding frame can be improved by rigid inner support rods and rigid outer support rods, thereby reducing safety hazards in construction.

[0022] 3) The column top-variable section-cavity top ring tube combined spray curing system of the present invention abandons the traditional manual watering curing method and instead adopts a new technology of uniformly spraying curing water onto the concrete surface of the variable section cylindrical pier. This change effectively solves the problem of concrete surface cracking that may be caused by uneven manual watering, and the construction effect is remarkable.

[0023] 4) The annular attached formwork scaffolding system of the present invention is convenient to construct, simple to operate, has a reasonable force form, and has good technical and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the integral top mold and non-removable inner mold system structure;

[0025] Figure 2 Schematic diagram of the structural system of the tire frame for precise positioning and in-situ binding of steel bars;

[0026] Figure 3 Schematic diagram of the laser transmitting end structure;

[0027] Figure 4 Schematic diagram of the laser receiving end structure;

[0028] Figure 5 Top view of the screw U-shaped rod;

[0029] Figure 6 Schematic diagram of the system structure of the combined spray curing system of column top-variable cross section-cavity top ring pipe;

[0030] Figure 7 Schematic diagram of the annular formwork scaffolding system architecture.

[0031] Description of the accompanying drawings: 1 annular spray curing pipe, 2 fixed plate, 3 tension screw, 4 adjustment flange, 5 adjustable outer plate, 6 non-disassembly inner mold, 8 holes, 9 longitudinal reinforcement of steel cage, 10 supporting column, 11 stirrups of steel cage, 12 fixed pillar, 13 rigid outer support rod, 14 second support hoop, 15 rigid inner support rod, 16 first support hoop, 17 steel cage, 18 support rod tray, 19 support vertical rod, 20 support diagonal rod, 21 support horizontal rod rod, 22 transmitter boom, 23 laser transmitter, 24 fixing screw, 25 adjusting nut, 26 U-shaped rod, 27 laser receiving surface layer, 28 laser receiving rod, 29 steel rope, 30 spray rack, 31 electric winch, 32 operating platform, 33 bearing platform, 34 lifting ear, 35 spray head, 37 water storage tank, 38 water inlet pipe, 39 horizontal connecting rod, 40 variable-section cylindrical pier, 41 horizontal rod, 42 pier formwork, 43 scaffolding, 44 vertical rod. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0033] Embodiment 1

[0034] As an embodiment, the construction method of the large-diameter variable-section hollow cast-in-place concrete cylindrical pier includes the following construction steps:

[0035] S1. Install the integral top formwork non-removal inner formwork technology system, reserve holes 8 on the fixed plate 2, and set up the non-removal inner formwork 6, the fixed plate 2 and the adjustable outer plate 5 at the predetermined position. Then install the tension screw 3 and the adjustment flange 4, and adjust the adjustable outer plate 5 to meet the construction requirements of cylindrical piers with different cross-sections.

[0036] S2, installation of steel bar precise positioning in-situ tying frame technology system, including pre-installation of built-in support columns 10 and fixed pillars 12, followed by installation of rigid inner support rods 15, first pillar clamps 16, second pillar clamps 14, rigid outer support rods 13 and support rod trays 18, to complete the internal and external combined support frame and improve the overall rigidity. Finally, the steel cage longitudinal bars 9 and steel cage hoop bars 11 of the steel cage 17 are set up.

[0037] S3. After the steel cage 17 is installed in the integral top mold and non-removable inner mold technology system, the outer mold-steel cage verticality precise positioning detection technology system is installed, including pre-installing the fixing screw 24, the adjusting nut 25 and the U-shaped rod 26, so that the laser emitting end and the laser receiving end are connected to the external component. When the laser emitting end is installed, the bracket cross bar 21, the bracket diagonal rod 20 and the bracket vertical rod 19 need to be erected, and the laser transmitter 23 is fixed to the inner side of the bracket cross bar 21 through the transmitter suspension rod 22. When the laser receiving end is installed, the laser receiving rod 28 is welded on the bracket vertical rod 19 and the laser receiving surface layer 27 is installed.

[0038] S4, casting the variable-section cylindrical pier 40, installing the column top-variable section-cavity top ring pipe spray curing technology system, firstly, setting up the foundation 33 and the operating platform 32 on the road surface and placing the electric winch 31 thereon, and driving the spray rack 30 connected by the steel rope 29 and the lifting lug 34 through the electric winch 31. Then, the spray head 35 is installed on the spray rack 30 and connected to the water tank 37 through the water inlet pipe 38. The up and down movement of the spray head 35 can spray and cure the variable-section cylindrical piers 40 with different cross-sectional sizes.

[0039] S5. Install the annular formwork scaffolding technology system, and assemble the horizontal bars 41, vertical bars 44 and horizontal connecting rods 39 of the scaffolding 43 with the pier formwork 42 of the variable-section cylindrical pier 40 to improve the construction efficiency of the pier column.

[0040] In the above method, after the variable-section cylindrical pier 40 is constructed and formed, an annular spray curing pipe 1 is arranged on the variable-section cylindrical pier 40 .

[0041] Embodiment 2

[0042] As another embodiment, this embodiment 2 is proposed on the basis of embodiment 1. This method uses a large-diameter variable-section hollow cast-in-place concrete cylindrical pier construction system, such as Figures 1 to 7 As shown, it includes an integral top formwork and inner formwork system that does not require disassembly, an in-situ tyre frame system for precise positioning of steel bars and binding, an outer formwork-steel cage verticality precise positioning detection system, a column top-variable section-cavity top ring pipe combined spray curing system and a ring-shaped attached formwork scaffolding technology system.

[0043] The integral top formwork non-disassembly inner formwork system includes an inner formwork non-disassembly maintenance system and an outer formwork adjustment system. The steel bar precise positioning in-situ tying frame system includes a built-in support column 10. The steel bar precise positioning in-situ tying frame system includes a built-in support column 10 and a fixed support column 12. The steel bar cage 17 is fixed between the built-in support column 10 and the fixed support column 12.

[0044] The column top-variable section-cavity top ring tube spray curing system includes an electric lifting system and a spray curing system. The spray curing system is mounted on the variable section cylindrical pier 40. The electric lifting system controls the spraying position of the spray curing system through an electric winch 31 and a steel rope 29.

[0045] like Figure 1 As shown, the integral top mold non-disassembly inner mold system is composed of an inner mold non-disassembly maintenance system and an outer mold adjustment system. The inner mold non-disassembly maintenance system includes a non-disassembly inner mold 6 and an annular spray curing pipe 1 on a variable-section cylindrical pier 40; and the outer mold adjustment system is composed of a fixed plate 2, an outer plate 5 with holes 8, a tension screw 3 and an adjustment flange 4.

[0046] like Figure 2 As shown, the steel bar precise positioning in-situ binding tire frame system includes installing built-in support columns 10 and rigid inner support rods 15 in a steel cage 17 to improve the rigidity of the overall structure from the inside. The steel cage 17 is composed of steel cage longitudinal bars 9 and steel cage hoop bars 11. A first support hoop 16 and a second support hoop 14 are provided, and the rigid outer support rods 13 and support rod trays 18 are used to improve the external structural rigidity of the steel cage 17 by fixing the support 12.

[0047] Embodiment 3

[0048] As another embodiment, this embodiment 3 proposes a more specific large-diameter variable-section hollow cast-in-place concrete cylindrical pier construction system based on the embodiment 2:

[0049] like Figures 3 to 5 As shown, the external mold-rebar cage verticality precise positioning detection system includes a laser emitting end and a laser receiving end, and is connected to the external component through a fixing screw 24, an adjusting nut 25 and a U-shaped rod 26. The laser emitting end is composed of a bracket cross bar 21, a bracket diagonal rod 20, a bracket vertical rod 19, a transmitter suspension rod 22 and a laser transmitter 23; the laser receiving end includes a bracket vertical rod 19, a laser receiving rod 28 and a laser receiving surface layer 27, and the verticality is detected and adjusted through the data fed back by the laser receiving surface layer 27.

[0050] like Figure 6As shown, the column top-variable section-cavity top ring tube spray curing system includes an electric lifting system and a spray curing system, and the electric lifting system is composed of a base 33, an operating platform 32, an electric winch 31, a steel rope 29 and a lifting lug 34; the spray curing system includes a spray rack 30, a spray head 35, a water inlet pipe 38 and a water storage tank 37, the spray head 35 and the lifting lug 34 are installed on the spray rack 30, one end of the steel rope 29 is connected to the electric winch 31, and the other end is used to hang the spray rack 30 from the top of the variable-section cylindrical pier 40, so as to control the up and down movement of the spray head 35 to perform spray curing on the variable-section cylindrical piers 40 with different cross-sectional sizes.

[0051] like Figure 7 As shown, the annular formwork scaffolding system is a scaffolding 43 set up on the pier formwork 42 of the variable-section cylindrical pier 40 , and the scaffolding 43 is composed of a horizontal rod 41 , a vertical rod 44 and a horizontal connecting rod 39 .

[0052] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0053] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A construction method for a large-diameter variable-section hollow cast-in-place concrete cylindrical pier, characterized in that: The construction steps include: S1. Install the integral top mold and non-removal inner mold system and adjust the adjustable outer panel; S2. Install the steel bar to accurately position the in-situ tyre frame system, construct the internal support columns and fixed pillars, complete the internal and external support tyre frame, and finally set up the steel cage of the variable-section cylindrical pier; S3. Install the external mold-rebar cage verticality precise positioning detection system so that the laser emitting end and the laser receiving end are connected to the external components; install the laser emitter and the laser receiving surface layer; S4. After pouring the variable-section cylindrical pier, install the column top-variable-section-cavity top ring pipe spray curing system, and use the electric winch to drive the spray frame up and down to spray and cure the variable-section cylindrical pier; S5. A circular formwork scaffolding system is installed on the outside of the pier formwork of the variable-section cylindrical pier.

2. The construction method of large-diameter variable-section hollow cast-in-place concrete cylindrical pier according to claim 1 is characterized in that: The integral top formwork and non-disassembly inner formwork system includes an inner formwork non-disassembly maintenance system and an outer formwork adjustment system. The inner formwork non-disassembly maintenance system includes an inner formwork non-disassembly maintenance system and an annular spray curing pipe on a variable-section cylindrical pier; the outer formwork adjustment system includes a fixed plate, an adjustable outer plate, tension screws and an adjustment flange; in step S1, firstly, holes are reserved on the fixed plate, and then the non-disassembly inner formwork, the fixed plate and the adjustable outer plate are set up, and then the tension screws and the adjustment flange are installed, and the adjustable outer plate is adjusted to meet the construction requirements of variable-section cylindrical piers with different cross-sections. After the construction is formed, an annular spray curing pipe is arranged on the variable-section cylindrical pier.

3. The construction method of large-diameter variable-section hollow cast-in-place concrete cylindrical pier according to claim 1 is characterized in that: The steel bar precise positioning and in-situ binding frame system includes built-in support columns and rigid inner support rods installed in the steel bar cage, and the rigid inner support rods are supported between the built-in support columns and the steel bar cage; the steel bar cage includes longitudinal bars and stirrups, and the outside of the steel bar cage is connected to a fixed column through a rigid outer support rod and a support rod tray, and the fixed column is provided with a first column clamp and a second column clamp for connecting the rigid outer support rod.

4. The construction method of large-diameter variable-section hollow cast-in-place concrete cylindrical pier according to claim 3 is characterized in that: In step S2, built-in support columns and fixed columns are pre-fabricated, and then rigid inner support rods, first column clamps, second column clamps, rigid outer support rods and support rod trays are installed, and finally the longitudinal reinforcement and stirrups of the reinforcement cage are set up.

5. The construction method of large-diameter variable-section hollow cast-in-place concrete cylindrical pier according to claim 1 is characterized in that: The external mold-rebar cage verticality precise positioning detection system includes a laser emitting end and a laser receiving end, both of which are connected to an external component through a fixing screw, an adjusting nut and a U-shaped rod; the laser emitting end includes a bracket cross bar, a bracket diagonal rod, a bracket vertical rod, a transmitter suspension rod and a laser transmitter; the laser receiving end includes a bracket vertical rod, a laser receiving rod and a laser receiving surface layer; in step S3, the laser emitter is fixed to the inner side of the bracket cross bar through the transmitter suspension rod, and when the laser receiving end is applied, the laser receiving rod is welded on the bracket vertical rod and the laser receiving surface layer is installed.

6. The construction method of large-diameter variable-section hollow cast-in-place concrete cylindrical pier according to claim 1 is characterized in that: The column top-variable section-cavity top ring tube spray curing system includes an electric lifting system and a spray curing system, wherein the electric lifting system includes a pedestal, an operating platform, an electric winch, a steel rope and a lifting lug; the spray curing system includes a spray rack, a spray head, a water inlet pipe and a water storage tank; in step S4, firstly, a pedestal and an operating platform are set up on the road surface and an electric winch is placed thereon, and the spray rack connected by the steel rope and the lifting lug is driven by the electric winch, and then the spray head is installed on the spray rack and connected to the water storage tank through the water inlet pipe, and the up and down movement of the spray head can perform spray curing on variable-section cylindrical piers of different cross-sectional sizes.

7. The construction method of large-diameter variable-section hollow cast-in-place concrete cylindrical pier according to claim 1 is characterized in that: The annular formwork scaffolding system comprises a scaffolding, which is erected outside the pier formwork of the variable-section cylindrical pier. The scaffolding comprises cross bars, vertical bars and cross connecting bars, which are combined and assembled with the pier formwork of the variable-section cylindrical pier.

8. Large diameter variable cross-section hollow cast-in-place concrete cylindrical pier, characterized by: Obtained by the method according to any one of claims 1 to 7.

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