Method for vibrating cast-in-place concrete of herringbone column of cooling tower

Abstract

The invention discloses a cooling tower herringbone column cast-in-place concrete vibrating method, and belongs to the technical field of cooling tower herringbone column construction of constructional engineering. The method comprises the following steps: mounting herringbone column steel bars; a guide rail is mounted at the axis of the herringbone column; a plug-in vibrating rod assembly is mounted on the guide rail; mounting a herringbone column template; and pouring herringbone column concrete. The device has the advantages that it is guaranteed that the whole circle of concrete of the herringbone column is vibrated evenly and does not make contact with surrounding steel bars, the risk that a steel bar protection layer cushion block falls off is reduced, and when the concrete pouring face rises, the pulling-up opportunity of the insertion type vibrating rod assembly is determined through buoyancy of the air bag, and then manual pulling-up is adopted; it is guaranteed that the depth of a vibrating rod inserted into concrete is always the optimal vibrating depth, and the herringbone column concrete construction quality is improved; repair caused by insufficient thickness of the protective layer or even rib exposure is reduced, and construction cost and maintenance investment are saved.

Description

Technical Field

[0001] This invention belongs to the field of cooling tower construction technology in building engineering, and in particular provides a method for vibrating cast-in-place concrete for cooling tower A-frame columns. Background Technology

[0002] The main construction process for cast-in-place concrete for cooling tower A-frame columns is as follows: rebar tying – A-frame column formwork installation – concrete pouring – formwork removal. During this construction, the A-frame column, being a slender, inclined structure, presents significant challenges for concrete vibration. Because the A-frame column is circular, using a plate vibrator results in misalignment with the curved surface of the formwork, and the large diameter of the A-frame column prevents the vibrator from penetrating it completely. Furthermore, the rebar cover spacers are tightly attached to the formwork surface, making them prone to detaching during plate vibrator operation. This leads to insufficient rebar cover thickness, affecting the lifespan of the A-frame column and potentially causing exposed rebar. When using an immersion vibrator, the vibrator sinks to the bottom and rests on the lower rebar due to its own weight. In this case, vibration can easily cause localized over-vibration of the lower concrete, leading to segregation, and insufficient vibration of the upper concrete. Additionally, the vibrator's placement on the lower rebar causes significant disturbance, easily causing the rebar cover spacers to detach, resulting in insufficient rebar cover thickness, affecting the lifespan of the A-frame column, and potentially causing exposed rebar. Summary of the Invention

[0003] The purpose of this invention is to provide a method for vibrating cast-in-place concrete for A-frame columns in cooling towers. This method solves problems such as incomplete vibration due to misalignment between the vibrator and the curved surface of the formwork, and over-vibration of the lower concrete caused by the vibrator sinking to the bottom and resting on the reinforcing steel due to its own weight, all of which affect the service life of the A-frame columns.

[0004] This invention primarily involves erecting a guide rail coaxial with the center of the herringbone column, and installing an immersion vibrator assembly on the guide rail. An inflatable capsule is installed on the vibrator assembly. This method ensures the vibrator remains centered on the herringbone column, guaranteeing effective vibration of the entire circumference of the concrete without touching the surrounding reinforcing steel, reducing the risk of the steel reinforcement protective layer spacers falling off. Furthermore, as the concrete surface rises, the buoyancy of the inflatable capsule determines the timing of pulling up the immersion vibrator assembly. The inflatable capsule on the vibrator assembly allows for manual pulling up during the concrete surface rise, ensuring the vibrator is always inserted to the optimal vibration depth, thereby improving the construction quality of the herringbone column concrete.

[0005] The construction steps of this invention are as follows:

[0006] (1) Install the reinforcing steel bars of the herringbone column;

[0007] (2) Tie the lower positioning device 7, and insert the guide rail 2 into the center hole of the lower positioning device 7 along the axis of the herringbone column;

[0008] (3) Assemble the vibratory rod bracket 8, the insert vibratory rod 9, and the traction rope 10 to form the insert vibratory rod assembly 3. Install the air capsule 4 on the vibratory rod assembly 3, and then thread the insert vibratory rod assembly 3 onto the guide rail 2, ensuring that the insert vibratory rod 9 faces upward; slide the vibratory rod assembly 3 and the air capsule 4 to the bottom.

[0009] (4) Insert the upper positioning device 7 into the guide rail 2 and tie it to the top of the herringbone column;

[0010] (5) Install the herringbone column formwork 5;

[0011] (6) Pour concrete 6, lift the immersion vibrator assembly 3, repeat this step until concrete 6 is poured to the top of the herringbone column 1 meter, remove the upper positioning device 7, the immersion vibrator assembly 3 and the air capsule 4, pull out the guide rail 2, and the concrete 6 is poured.

[0012] (7) After the concrete 6 reaches the required strength, remove the formwork 5 of the herringbone column.

[0013] The guide rail 2 in this invention is made of ordinary 40×40mm square tube, and its length L2 = the length of the herringbone column axis + 200mm; the positioning device 7 is made of φ10 threaded steel, and the outer diameter R1 of the positioning device 7 is equal to the inner diameter of the herringbone column steel bar 1. The center of the central square hole overlaps with the axis of the herringbone column, and the size of the square hole L3×L3 = 50×50mm.

[0014] The insertable vibrator assembly 3 of this invention consists of a vibrator bracket 8, an insertable vibrator 9, and a traction rope 10. The vibrator bracket 8 is made of φ10 threaded steel, in the shape of a steel cage, with a length L4 = 500mm, dimensions L5×L5 = 100×100mm, and a bottom square hole size L6×L6 = 50×50mm. The circumferential steel bars are evenly arranged along the length, and the bottom sealing steel bars are preferably used to ensure that the insertable vibrator 9 does not fall out. The insertable vibrator 9 is an extended vibrator. The traction rope is made of 10mm thick nylon rope. The length of the insertable vibrator and the traction rope is the length of the A-frame column + 1000mm.

[0015] The air-filled capsule 4 is made by filling a rubber capsule with air into a drain pipe with an outer diameter of 110mm used for water tightness testing.

[0016] The method of this invention mainly involves setting up a guide rail 2 to ensure that the immersion vibrator assembly 3 is always positioned at the axial center of the herringbone column for vibration, without touching the surrounding reinforcing bars, thus reducing the risk of the reinforcing bar protective layer spacers falling off. At the same time, the buoyancy of the airbag is used to determine the timing of lifting the immersion vibrator assembly 3, and then manual lifting is used to ensure that the immersion vibrator 9 is always inserted into the concrete at the optimal vibration depth, thereby achieving the purpose of improving the construction quality of the herringbone column concrete.

[0017] The beneficial effects of this invention are:

[0018] 1. Advanced features: It is simple to manufacture and easy to use.

[0019] 2. Necessity: The spacers for the protective layer of the reinforcing steel bars in the herringbone column prevent disturbance and provide good vibration for the concrete, thereby ensuring the construction quality of the herringbone column concrete and guaranteeing the service life of the herringbone column.

[0020] 3. Cost savings: This method ensures the thickness of the protective layer for the herringbone column, reducing repairs caused by insufficient protective layer thickness or even exposed reinforcement, thus saving construction costs and maintenance investment. Attached Figure Description

[0021] Figure 1 This is an overall schematic diagram of the present invention. It includes: 1. Herringbone column reinforcement; 2. Guide rail; 3. Insertion vibrator assembly; 4. Inflatable capsule; 5. Herringbone column formwork; 6. Concrete; and 7. Positioning device.

[0022] Figure 2 This is a schematic diagram of the positioning device 7 and the guide rail 2. Wherein, L1×L1=40×40mm, L2=axial length of the herringbone column + 200mm. R1=inner diameter of the herringbone column reinforcing bar 1. L3×L3=50×50mm.

[0023] Figure 3 This is a schematic diagram of the insert vibrator assembly 3, which includes a vibrator bracket 8, an insert vibrator 9, and a traction rope 10. L4 = 500mm, L5×L5 = 100×100mm, and L6×L6 = 50×50mm. Detailed Implementation

[0024] To make the method of the present invention easier to understand, the implementation process of the method is briefly described below.

[0025] 1. Tie the reinforcing bars of the herringbone column according to the drawings.

[0026] 2. Tie the lower positioning device 7 to the bottom of the inner ring of the herringbone column steel bar 1, perpendicular to the axis of the herringbone column.

[0027] 3. Insert the guide rail 2 into the center hole of the lower positioning device 7.

[0028] 4. Assemble the vibratory rod bracket 8, the insert vibratory rod 9, and the traction rope 10 into an insert vibratory rod assembly 3. Install the air capsule 4 on the insert vibratory rod assembly 3, and place the insert vibratory rod assembly 3 on the guide rail 2 and slide it to the bottom.

[0029] 5. Place the upper positioning device 7 onto the guide rail 2 and tie it to the top of the inner ring of the herringbone column steel bar 1.

[0030] 6. Install the herringbone column formwork 5.

[0031] 7. Pour concrete 6. While pouring, manually tighten the traction rope 10. When the tension decreases, it means that the inflatable capsule 4 is being held firmly by the concrete 6, generating buoyancy. At this point, pull the traction rope 10 upwards. When the tension increases, it means that the inflatable capsule 4 has completely floated out of the concrete 6. Stop pulling the traction rope 10 upwards, but keep it taut. Repeat this step until the concrete 6 is poured to 1 meter below the top of the A-frame column.

[0032] 8. When concrete 6 reaches 1 meter above the top of the herringbone column, remove the upper positioning device 7, pull out the immersion vibrator assembly 3 and the air capsule 4 from the guide rail 2, then pull out the guide rail 2, and pour concrete 6 until the herringbone column is full. This part of the concrete can be directly vibrated by hand with the immersion vibrator 10. Simply clean the guide rail 2, the immersion vibrator assembly 3, and the air capsule 4 for easy use in pouring the next herringbone column.

[0033] 9. After the concrete reaches the design and specification requirements, remove the formwork 5 for the herringbone column and carry out subsequent curing as required.

Claims

1. A method for vibrating cast-in-place concrete for a cooling tower's herringbone column, characterized in that, The construction steps are as follows: (1) Install the reinforcing steel bars for the herringbone column (1); (2) Tie the lower positioning device (7) and insert the guide rail (2) into the center hole of the lower positioning device (7) along the axis of the herringbone column; (3) Assemble the vibratory rod bracket (8), the insert vibratory rod (9), and the traction rope (10) to form the insert vibratory rod assembly (3). Install the air capsule (4) on the insert vibratory rod assembly (3), and then thread the insert vibratory rod assembly (3) onto the guide rail (2), ensuring that the insert vibratory rod (9) faces upward; slide the insert vibratory rod assembly (2) and the air capsule (4) to the bottom; (4) Insert the upper positioning device (7) into the guide rail (2) and tie it to the top of the herringbone column; (5) Install the herringbone column formwork (5); (6) Pour concrete (6), lift the immersion vibrator assembly (3) and repeat this step until the concrete (6) is poured to 1 meter above the top of the herringbone column. Remove the upper positioning device (7), the immersion vibrator assembly (3) and the air capsule (4), pull out the guide rail (2), and pour the remaining concrete (6) until it is full. (7) After the concrete (6) reaches the required strength, remove the formwork (5) of the herringbone column.

2. The method for vibrating cast-in-place concrete for a cooling tower A-frame column according to claim 1, characterized in that, The guide rail (2) is made of ordinary 40×40mm square tube, and the length L2 = the length of the herringbone column axis + 200mm; the positioning device (7) is made of φ10 threaded steel, the outer diameter R1 of the positioning device (7) = the inner diameter of the herringbone column steel bar (1), the center of the central square hole overlaps with the axis of the herringbone column, and the size of the square hole L3×L3 = 50×50mm.

3. The method for vibrating cast-in-place concrete for a cooling tower A-frame column according to claim 1, characterized in that, The immersion vibrator assembly (3) consists of a vibrator bracket (8), an immersion vibrator (9), and a traction rope (10). The vibrator bracket (8) is made of φ10 threaded steel, in the shape of a steel cage, with a length L4 = 500mm, a size of L5×L5 = 100×100mm, and a bottom square hole size of L6×L6 = 50×50mm. The circumferential steel bars are evenly arranged along the length, and the bottom sealing steel bars should ensure that the immersion vibrator (9) does not come out. The immersion vibrator (9) is an extended vibrator. The traction rope is made of 10mm thick nylon rope. The length of the vibrator and the traction rope is the length of the A-frame column + 1000mm.

4. The method for vibrating cast-in-place concrete for a cooling tower A-frame column according to claim 1, characterized in that, The air-filled capsule (4) is made by filling a rubber capsule with air into a drain pipe with an outer diameter of 110 mm for water tightness testing.

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