Pier column straining beam construction method

Abstract

The invention relates to a pier column straining beam construction method which comprises the specific steps that S1, pier column pouring sections are divided, and each divided pier column pouring section comprises a pier column and a straining beam; s2, the pier column and the straining beam end in the first pier column pouring section are poured; s3, a pier column and a straining beam end in the second pier column pouring section are poured, a hanging bracket formwork is installed, and a straining beam middle section in the first pier column pouring section is constructed; s4, the pier column and the straining beam end in the third pier column pouring section are poured, the hanging bracket formwork is transferred to the straining beam end in the second pier column pouring section, and a straining beam middle section in the second pier column pouring section is constructed; and S5, construction of the pier columns and the straining beams forms line production until construction of all the pier columns and the straining beams is completed. The construction of the pier column and the straining beam forms line production, the construction efficiency is greatly improved, and efficient, convenient and safe construction of the pier column straining beam is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge design and construction, and in particular to a pier tie beam construction method. Background Art

[0002] At present, expressways are developing rapidly. However, due to the changing terrain and environment of expressway bridges, most structures such as bridge piers and tie beams are constructed by cast-in-place method. One of the main factors affecting the efficient and rapid construction of piers and tie beams is that the multiple tie beams between piers and the construction of piers are mutually constrained. In conventional operations, tie beams and piers are often cast simultaneously, which invisibly delays the overall construction period of piers and tie beams.

[0003] The three methods commonly used in tie beam construction are the scaffolding method, steel rod method and hoop method, each of which has its own advantages and disadvantages; the scaffolding method has high requirements for the ground foundation, the scaffolding erection period is long, and it is not suitable for multiple upper and lower tie beams; the steel rod method construction requires holes to be reserved on the pier in the early stage and filled in the later stage, and the process is relatively cumbersome; the local hollowing effect and welding defects of the hoop method have certain safety hazards, and may cause damage to the pier structure. In terms of construction, the precise installation of the hoop requires aerial work, and the pre-compression of the hoop is difficult. Summary of the invention

[0004] The present invention aims to solve the deficiencies of the prior art and provides a pier tie beam construction method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A pier tie beam construction method, the specific steps are:

[0007] S1. Divide the pier casting sections;

[0008] The pier column template includes several standard pier column templates and special-shaped templates at the intersection of pier column and tie beam. The pier column casting segment division needs to match the pier column template. Each divided pier column casting segment includes a pier column and a tie beam.

[0009] S2, pouring the piers and tie beam ends in the first pier pouring section;

[0010] Tie up the steel bars of the pier and tie beam ends. The steel bars of the tie beam ends penetrate the special-shaped formwork and extend into the middle section of the tie beam to be constructed later. They are connected with the steel bars of the middle section of the tie beam as a reserved steel bar joint. Set up the standard pier formwork and special-shaped formwork in the first pier casting section and pour concrete.

[0011] S3, pour the pier and the end of the tie beam in the second pier pouring section, install the hanger formwork, and construct the middle section of the tie beam in the first pier pouring section;

[0012] The hanger formwork includes load-bearing beams, suspension rods and bottom beam structures;

[0013] After the concrete of the tie beam end in the first pier casting section is cured to the required strength, the special-shaped formwork is removed, a cushion beam is placed on the top surface of the tie beam end, the assembled load-bearing beam and the suspension rod are hoisted onto the cushion beam as a whole, the bottom beam structure is assembled on the ground directly below the tie beam, the suspension rod is lowered to connect the bottom beam structure, the tied tie beam reinforcement skeleton is hoisted onto the bottom formwork of the bottom beam structure as a whole, and the position of the tie beam reinforcement skeleton is adjusted and fixed, the bottom beam structure is continued to be lifted to the bottom elevation of the tie beam, the reserved reinforcement extending into the middle section of the tie beam is connected to the tie beam reinforcement skeleton by a reinforcement connection joint, the side formwork is installed, and the concrete of the middle section of the tie beam is poured;

[0014] S4, pour the pier and the end of the tie beam in the third pier pouring section, transfer the hanger template to the end of the tie beam in the second pier pouring section, and construct the middle section of the tie beam in the second pier pouring section;

[0015] S5. Repeat step S4 to form a flow line operation for the construction of piers and tie beams until the construction of all piers and tie beams is completed.

[0016] In step S2, before tying the steel bars at the ends of the pier and tie beam, the joint between the pier and the pile foundation is processed first.

[0017] In step S3, after the suspension rod falls and connects to the bottom beam structure, the bottom beam structure is first lifted to 20 cm above the ground to pre-press the hanger template. After the pre-pressing is completed, the tie beam reinforcement skeleton is hoisted and placed.

[0018] In step S3, after the position of the tie beam reinforcement skeleton is adjusted, the corresponding steel bars of the tie beam reinforcement skeleton correspond to the positions of the steel bars extending from the end of the tie beam into the middle section of the tie beam, and after the bottom beam structure is lifted into place, the coaxiality of the corresponding steel bars should be within the allowable error range of the steel bar connection joint.

[0019] In step S4, the specific process of transferring the hanger formwork is as follows: after the concrete of the middle section of the tie beam in the first pier casting section is cured to the design strength, the side formwork of the middle section of the tie beam is first removed, and then the suspension rod is lowered synchronously until the bottom beam structure falls smoothly on the ground, the connection between the bottom beam structure and the suspension rod is released, and a cushion beam is placed on the top surface of the tie beam end in the second pier casting section, the load-bearing beam and the suspension rod located in the first pier casting section are lifted upward as a whole, the load-bearing beam is rotated horizontally and smoothly passes through the tie beam end in the second pier casting section, and the load-bearing beam and the suspension rod are placed as a whole on the cushion beam on the top surface of the tie beam end in the second pier casting section.

[0020] The beneficial effects of the present invention are as follows: the construction of the pier column and the tie beam of the present invention forms a flow operation, the construction efficiency is greatly improved, and the efficient, convenient and safe construction of the pier column and the tie beam is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the step S4 of the present invention when it is completed;

[0022] Figure 2 It is a schematic diagram of the pier column formwork in the present invention;

[0023] Figure 3 It is a schematic diagram of the ground installation of the tie beam reinforcement frame in the present invention;

[0024] Figure 4 A schematic diagram of the connection between the reserved steel bars and the tie beam steel bar skeleton in the present invention;

[0025] Figure 5 It is a side elevation schematic diagram of the hanger structure in the present invention;

[0026] Figure 6 It is a schematic diagram of pouring the tie beam in the present invention;

[0027] In the figure: 1- pier casting section; 2- pier; 3- tie beam; 4- pier formwork; 5- hanger formwork; 6- cushion beam; 7- tie beam reinforcement skeleton; 8- reinforcement connection joint;

[0028] 31-tie beam end; 32-tie beam middle section;

[0029] 41-standard pier formwork; 42-special-shaped formwork;

[0030] 51- load-bearing beam; 52- suspension rod; 53- bottom beam structure;

[0031] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0033] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0036] like Figures 1 to 6 As shown, a pier tie beam construction method, the specific steps are:

[0037] S1, divide the pier column casting section 1;

[0038] The pier column template 4 includes a plurality of standard pier column templates 41 and special-shaped templates 42 at the intersection of the pier column and the tie beam. The pier column casting section 1 needs to be matched with the pier column template 4 when it is divided. Each divided pier column casting section 1 includes a pier column 2 and a tie beam 3.

[0039] S2, casting the pier 2 and the tie beam end 31 in the first pier casting section 1;

[0040] Process the joint between the pier column 2 and the pile foundation, roughen and clean the concrete at the joint between the pier column 2 and the pile foundation;

[0041] The steel bars of the pier column 2 and the tie beam end 31 are tied, and the steel bars of the tie beam end 31 penetrate the special-shaped formwork 42 and extend into the middle section 32 of the tie beam to be constructed later, and are connected to the steel bars of the middle section 32 of the tie beam as a reserved steel bar joint;

[0042] The standard pier column formwork 41 and the special-shaped formwork 42 in the first pier column casting section 1 are set up using lifting equipment, and the concrete is poured using a truck pump;

[0043] S3, casting the pier 2 and the tie beam end 31 in the second pier casting section 1, installing the hanger template 5, and constructing the tie beam middle section 32 in the first pier casting section 1;

[0044] The hanger template 5 includes a load-bearing beam 51, a suspension rod 52 and a bottom beam structure 53;

[0045] The specific process of constructing the middle section 32 of the tie beam in the first pier casting section 1 is as follows: after the concrete of the tie beam end 31 in the first pier casting section 1 is cured to the design strength, the special-shaped formwork 42 is removed, a cushion beam 6 is placed on the top surface of the tie beam end 31, and the load-bearing beam 51 and the suspension rod 52 assembled as one are hoisted onto the cushion beam 6 as a whole, and the bottom beam structure 53 is assembled on the ground directly below the tie beam 3, and the suspension rod 52 is dropped to connect the bottom beam structure 53, and the bottom beam structure 53 is first lifted to 20 cm above the ground, and the hanger formwork 5 is pre-assembled. After the pre-pressing is completed, the tied tie beam reinforcement skeleton 7 is hoisted as a whole onto the bottom formwork of the bottom beam structure 53, and the position of the tie beam reinforcement skeleton 7 is adjusted and fixed, so that the tie beam reinforcement skeleton 7 and the bottom beam structure 53 form a whole, and no relative displacement occurs during the hoisting process, and the bottom beam structure 53 is continuously lifted to the bottom surface elevation of the tie beam 3, and the reserved reinforcement extending into the middle section 32 of the tie beam is connected to the tie beam reinforcement skeleton 7 by using a reinforcement connection joint 8 with excellent connection performance and high fault tolerance, and the side formwork is installed, and the concrete of the middle section 32 of the tie beam is poured;

[0046] The steel bar connection joint 8 may adopt the structure disclosed in patent number CN 103741887B;

[0047] After the position adjustment of the tie beam reinforcement skeleton 7 is completed, the corresponding reinforcements of the tie beam reinforcement skeleton 7 correspond to the reinforcement positions of the tie beam end 31 extending into the tie beam middle section 32, and after the bottom beam structure 53 is lifted into place, the coaxiality of the corresponding reinforcements should be within the allowable error range of the reinforcement connection joint 8;

[0048] S4, casting the pier 2 and the tie beam end 31 in the third pier casting section 1, transferring the hanger template 5 to the tie beam end 31 in the second pier casting section 1, and constructing the tie beam middle section 32 in the second pier casting section 1;

[0049] The specific process of transferring the hanger formwork 5 is as follows: after the concrete of the middle section 32 of the tie beam in the first pier casting section 1 is cured to the design strength, the side formwork of the middle section 32 of the tie beam is first removed, and then the suspension rod 52 is synchronously lowered until the bottom beam structure 53 falls smoothly on the ground, the connection between the bottom beam structure 53 and the suspension rod 52 is released, and a cushion beam 6 is placed on the top surface of the tie beam end 31 in the second pier casting section 1, and the load-bearing beam 51 and the suspension rod 52 in the first pier casting section 1 are lifted upward as a whole, and the load-bearing beam 51 is horizontally rotated and smoothly passes through the tie beam end 31 in the second pier casting section 1, and the load-bearing beam 51 and the suspension rod 52 are placed as a whole on the cushion beam 6 on the top surface of the tie beam end 31 in the second pier casting section 1;

[0050] The specific process of constructing the tie beam middle section 32 in the second pier casting section 1 is as follows: hoist the tied tie beam steel bar skeleton 7 onto the bottom formwork of the bottom beam structure 53 again, and adjust and fix the position of the tie beam steel bar skeleton 7 so that the tie beam steel bar skeleton 7 and the bottom beam structure 53 form a whole and do not cause relative displacement during the hoisting process; hoist the bottom beam structure 53 together with the tie beam steel bar skeleton 7 of the tie beam middle section 32 of the second pier casting section 1 on the top surface of the first tie beam 3 as a whole, and adjust the position of the bottom beam structure 53, drop the suspension rod 52 to connect the bottom beam structure 53, lift the bottom beam structure 53, lift the top surface of the bottom formwork of the bottom beam structure 53 to the bottom surface elevation of the tie beam 3 of the second pier casting section 1, use the steel bar connection joint 8 with excellent connection performance and high fault tolerance to connect the reserved steel bars extending into the tie beam middle section 32 with the tie beam steel bar skeleton 7, install the side formwork, and cast the concrete of the tie beam middle section 32 of the second pier casting section 1;

[0051] S5, repeating step S4, the construction of the piers 2 and the tie beams 3 forms a flow operation until the construction of all the piers 2 and the tie beams 3 is completed.

[0052] In the construction method provided by the present invention, the construction of the pier column 2 and the tie beam 3 forms a flow operation, and the construction efficiency is greatly improved.

[0053] The structure of the hanger formwork 5 in the present invention mainly includes three major parts: a load-bearing beam 51, a suspension rod 52, and a bottom beam structure 53. During the specific construction, the load-bearing beam 51 and the suspension rod 52 are installed and transferred as a whole; the bottom beam structure 53 and the tie beam steel bar skeleton 7 are installed and transferred as a whole; and the tie beam steel bar skeleton 7 is prefabricated in a processing plant and hoisted as a whole on site; the construction operations all meet the requirements of highly assembled construction.

[0054] The hanger formwork 5 in the present invention is convenient for pre-stressing operation and can realize ground pre-stressing; the operations such as steel bar binding of the tie beam steel bar skeleton 7 are transferred from high altitude to the processing plant for implementation; and the aerial operations such as the aerial erection of the tie beam formwork support existing in conventional construction are eliminated; the aerial operation time is greatly reduced and the construction safety is improved.

[0055] The hanger formwork 5 in the present invention can be used circulated on multiple bridge piers 2; compared with the conventional support method, it saves a lot of support usage, and does not require measures such as foundation treatment of the ground, which is more economical for high pier construction.

[0056] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A pier tie beam construction method, characterized in that: The specific steps are: S1. Dividing the pier casting sections (1); The pier column template (4) includes a plurality of standard pier column templates (41) and special-shaped templates (42) at the intersection of the pier column and the tie beam. When the pier column casting section (1) is divided, it needs to match the pier column template (4). Each divided pier column casting section (1) includes a section of pier column (2) and a tie beam (3). S2, casting the pier (2) and the tie beam end (31) in the first pier casting section (1); The steel bars of the pier column (2) and the tie beam end (31) are tied, the steel bars of the tie beam end (31) penetrate the special-shaped formwork (42) and extend into the middle section (32) of the tie beam to be constructed later, and are connected as a reserved steel bar joint with the steel bars of the middle section (32) of the tie beam, and a standard pier column formwork (41) and a special-shaped formwork (42) in the first pier column casting section (1) are set up, and concrete is poured; S3, casting the pier (2) and the end of the tie beam (31) in the second pier casting section (1), installing the hanger formwork (5), and constructing the middle section (32) of the tie beam in the first pier casting section (1); The hanger template (5) comprises a load-bearing beam (51), a suspension rod (52) and a bottom beam structure (53); After the concrete of the tie beam end (31) in the first pier column casting section (1) is cured to the required design strength, the special-shaped formwork (42) is removed, a cushion beam (6) is placed on the top surface of the tie beam end (31), the load-bearing beam (51) and the suspension rod (52) assembled as one are hoisted onto the cushion beam (6), a bottom beam structure (53) is assembled on the ground directly below the tie beam (3), the suspension rod (52) is lowered to connect the bottom beam structure (53), the tied tie beam steel bar skeleton (7) is hoisted onto the bottom formwork of the bottom beam structure (53), the position of the tie beam steel bar skeleton (7) is adjusted and fixed, the bottom beam structure (53) is continuously lifted to the bottom surface elevation of the tie beam (3), the reserved steel bars extending into the middle section (32) of the tie beam are connected to the tie beam steel bar skeleton (7) by using a steel bar connection joint (8), the side formwork is installed, and the concrete of the middle section (32) of the tie beam is poured; S4, casting the pier (2) and the end of the tie beam (31) in the third pier casting section (1), transferring the hanger template (5) to the end of the tie beam (31) in the second pier casting section (1), and constructing the middle section (32) of the tie beam in the second pier casting section (1); S5, repeating step S4, the construction of the piers (2) and the tie beams (3) forms a flow operation until the construction of all the piers (2) and the tie beams (3) is completed.

2. A pier tie beam construction method according to claim 1, characterized in that: In step S2, before tying the steel bars of the pier column (2) and the tie beam end (31), the joint between the pier column (2) and the pile foundation is processed, and the concrete at the joint between the pier column (2) and the pile foundation is roughened and cleaned.

3. A pier tie beam construction method according to claim 2, characterized in that: In step S3, after the suspension rod (52) falls and connects to the bottom beam structure (53), the bottom beam structure (53) is first lifted to 20 cm above the ground, and the hanger template (5) is pre-pressed. After the pre-pressing is completed, the tie beam steel bar skeleton (7) is hoisted and placed.

4. A pier tie beam construction method according to claim 3, characterized in that: In step S3, after the position adjustment of the tie beam reinforcement skeleton (7) is completed, the corresponding reinforcement of the tie beam reinforcement skeleton (7) corresponds to the position of the reinforcement of the tie beam end (31) extending into the middle section (32) of the tie beam, and after the bottom beam structure (53) is lifted into place, the coaxiality of the corresponding reinforcement should be within the allowable error range of the reinforcement connection joint (8).

5. A pier tie beam construction method according to claim 4, characterized in that: In step S4, the specific process of transferring the hanger formwork (5) is as follows: after the concrete of the middle section (32) of the tie beam in the first pier column casting section (1) is cured to the design strength, the side formwork of the middle section (32) of the tie beam is first removed, and then the suspension rod (52) is synchronously lowered until the bottom beam structure (53) falls smoothly on the ground, the connection between the bottom beam structure (53) and the suspension rod (52) is released, and a cushion beam (6) is placed on the top surface of the tie beam end (31) in the second pier column casting section (1), and the load-bearing beam (51) and the suspension rod (52) in the first pier column casting section (1) are lifted upward as a whole, the load-bearing beam (51) is horizontally rotated and smoothly passes through the tie beam end (31) in the second pier column casting section (1), and the load-bearing beam (51) and the suspension rod (52) are placed as a whole on the cushion beam (6) on the top surface of the tie beam end (31) in the second pier column casting section (1).

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