Large-section high pier column pouring and vibrating method

Abstract

The invention discloses a large-section high pier column pouring and vibrating method which comprises the following steps: S1, firstly pouring concrete with the height of L1 as first-section concrete; s2, a plurality of vibrating rods are inserted into the first section of concrete, vibrating is started, meanwhile, the concrete continues to be poured upwards, and the vibrating time is t1; and S3, after the vibrating time is t1, the multiple vibrating rods are lifted upwards by the height of L1 at the same time, the vibrating time is continued to be t1, and the process is repeated till the pier top is reached. The technical problems that according to a conventional vibrating method, vibrating is difficult and the work efficiency is low during large-section high pier column concrete pouring are solved.

Description

Technical Field

[0001] The present invention relates to the field of beam bridge pier construction, and more particularly to a method for casting and vibrating large-section high piers. Background Art

[0002] Modern beam bridges have high bearing capacity requirements. Piers generally have large cross-sections, high heights, and dense steel bars. Conventional vibration technology requires the vibrating rod to be continuously pulled out of the concrete and then inserted into the concrete for vibration. Pulling the vibrating rod out of the large-section high pier and moving it to the next vibration point is time-consuming and labor-intensive, with low efficiency, resulting in a very slow pouring speed and the risk of uneven and loose vibration, and even cold joints. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for casting and vibrating large-section high pier columns, so as to solve the technical problems of difficult vibration and low efficiency in casting large-section high pier columns by conventional vibrating methods.

[0004] The technical solution adopted by the present invention to solve this technical problem is: a method for casting and vibrating large-section high pier columns, comprising the following steps: S1, pour the concrete at height L1 first as the first section of concrete; S2, insert multiple vibrating rods into the first section of concrete and start vibrating, while continuing to pour concrete upwards, the vibration time is t1; S3. After the vibration time reaches t1, lift multiple vibrating rods up to a height of L1 at the same time and continue vibrating for t1, and repeat this cycle until the top of the pier.

[0005] As a further solution of the present invention, a vibrating rod of φ70 is used, and the effective vibration radius is 0.8 to 0.9 times the diameter of the vibrating rod.

[0006] As a further solution of the present invention, the vibrating rod is supported and fixed by a positioning frame.

[0007] As a further solution of the present invention, the positioning frame is welded with ∠5×5 angle steel according to the position of the vibrating rod, and the two ends of the positioning frame are connected to the steel formwork of the high pier column with bolts. The positioning frame is provided with a positioning point, which can support the vibrating rod and allow the vibrator of the vibrating rod to pass through the positioning point and enter the concrete pouring area.

[0008] As a further solution of the present invention, before placing the vibrating rod, a mark is made every L1 in the direction from the vibrator of the vibrating rod to the motor of the vibrating rod to control the lifting height of the vibrating rod.

[0009] As a further solution of the present invention, during the pouring process, it is ensured that the rising speed of the concrete is less than the vibrating speed of the vibrating rod.

[0010] As a further solution of the present invention, in step S1 , before pouring concrete, a measuring rope is provided in the pouring area for measuring and controlling the pouring height.

[0011] The present invention includes at least the following beneficial effects: The method for casting and vibrating large-section high pier columns is a method for vibrating at multiple points simultaneously using multiple vibrating rods. During the casting and vibrating process of large-section high pier concrete, there is no need to move the vibrating rods downwards. It is only necessary to vibrate for a specified time and then lift the vibrating rods upwards. The method has high work efficiency and guaranteed vibration quality, and solves the technical problems of difficulty in moving rods and poor vibration quality. At the same time, the method solves quality problems such as uneven vibration, loose vibration, and cold seams that may be caused by vibration difficulties. Because the method is simple to operate and easy to control, it also solves the problem that the quality of traditional vibration is greatly affected by the level of the vibrator, improves the quality of the project, and has a high promotion value in similar projects.

[0012] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a plan view of the positioning frame in Example 1 of the present invention; Figure 2 This is a schematic diagram of the placement of four vibrators in Example 1 of the present invention; Figure 3 This is a schematic diagram of the first floor concrete after pouring in Example 1 of the present invention; Figure 4 It is a schematic diagram of the cyclic casting process of Example 1 of the present invention.

[0014] Among them, 1-positioning frame, 2-effective vibration area, 3-vibrating rod, 4-first section of concrete, 5-measuring rope. DETAILED DESCRIPTION

[0015] The present invention is described in detail and completely below with reference to the accompanying drawings. Those skilled in the art will be able to implement the present invention based on this description. Before describing the present invention with reference to the accompanying drawings, it should be noted that the technical solutions and technical features provided in various parts of the present invention, including those described below, may be combined with each other unless they conflict.

[0016] In addition, the embodiments of the present invention described below are generally only part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making any creative efforts should fall within the scope of protection of the present invention.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific implementation process is as follows: Example 1 Taking a 1.6m (length) × 1.6m (width) × 10m (height) pier as an example, vibration is carried out, specifically including: 1. Determine the position of the vibrator The vibrating rod is φ70, and the effective vibration radius is 0.8~0.9 times the diameter of the vibrating rod. The effective vibration area in actual construction is calculated as 60cm. The first row of vibrating rods is set 30cm away from the edge of the pier column template, and the spacing between the middle vibrating rods is 100cm. A total of 4 vibrating rods are set to cover the entire pier column section. The layout is as follows: Figure 1 shown.

[0018] 2. Place the vibrator Use ∠5×5 angle steel to weld the positioning frame according to the position of the vibrating rod. The positioning point is 10cm×10cm. The two ends of the positioning frame are connected to the steel template with bolts. Before placing the vibrating rod, make a mark every 50cm from the vibrator to the motor direction to control the lifting height of the vibrating rod. For details, see Figure 2 shown.

[0019] 3. Determine the vibration method (1) Calculate the concrete rising speed Based on the concrete pumping speed Q of the pump truck and the cross-sectional area S of the pier column, calculate the concrete rising speed V in the formwork: V=Q / 120S; Q…………Concrete pumping speed, generally 40m 3 / h; S…………cross-sectional area of pier, m2; V…………concrete rising speed in the formwork, m / 30s; According to calculations, the rising speed of the 1.6m×1.6m pier column concrete in the formwork is V=0.13m / 30s.

[0020] (2) Determine the concrete vibration method The rising speed of concrete is lower than the vibration speed of the vibrating rod. Therefore, during the entire pouring process, concrete can be poured continuously. Vibration needs to be done at intervals, with each interval being about 90 seconds. After the concrete rises 50cm, the next vibration is carried out.

[0021] 4. Pour the first section of concrete Since the vibrator length of the vibrator is about 50cm, the pouring height L1 of the first section of concrete is 50cm. The pouring height is controlled by a measuring rope. After pouring 50cm, four vibrators are inserted into the bottom of the concrete and vibration begins. During the vibration, one commander and four vibrators are equipped. The commander directs the vibrators to vibrate and stop at the same time. The vibration time is 30s. After stopping the vibration, the commander directs the 4m vibrators to lift the vibrators up 50cm at the same time. During the whole process, concrete is poured continuously. Figure 3 shown.

[0022] 5. Pour concrete to the top of the pier The concrete is poured continuously. The commander instructs the vibrator to vibrate for 30 seconds every time the concrete rises 50cm in the formwork. This process is repeated until the concrete is poured to the top of the pier. Figure 4 shown.

[0023] During the entire pouring process, the vibrator must completely obey the instructions of the commander and only need to lift the vibrating rod upwards according to the commander's requirements.

[0024] Comparative Example 1 Taking a 1.6m (length) × 1.6m (width) × 10m (height) pier as an example, conventional vibrating pouring is performed. The specific methods include: 1. Preparation of vibrating rod Two vibrators placed the vibrating rods at the bottom of the pier formwork and prepared for vibration.

[0025] 2. Concrete pouring The concrete is pumped into the pier formwork and poured to a thickness of 50cm. The vibrator starts vibrating. After vibrating one point, the vibrator rod is raised to the top of the pier, and then lowered to another vibrating point and starts vibrating until all the concrete layers are vibrated. Then the next layer of concrete is poured until it reaches the top of the pier.

[0026] The piers cast in Example 1 and Comparative Example 1 were tested, and the results are shown in Table 1.

[0027] Table 1 By comparison, it can be seen that the new method of vibrating the pier column greatly improves the pouring efficiency and improves the appearance quality of the concrete.

[0028] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A method for casting and vibrating large-section high pier columns, characterized in that: The following steps are involved: S1, pour the concrete at height L1 first as the first section of concrete; S2, insert multiple vibrating rods into the first section of concrete and start vibrating, while continuing to pour concrete upwards, the vibration time is t1; S3. After the vibration time reaches t1, lift multiple vibrating rods up to a height of L1 at the same time and continue vibrating for t1, and repeat this cycle until the top of the pier.

2. The method for casting and vibrating large-section high pier columns according to claim 1, characterized in that: The vibrating rod is φ70, and the effective vibration radius is 0.8~0.9 times the diameter of the vibrating rod.

3. The method for casting and vibrating large-section high pier columns according to claim 1, characterized in that: The vibrating rod is supported and fixed by a positioning frame.

4. The method for casting and vibrating large-section high pier columns according to claim 3, characterized in that: The positioning frame is welded with ∠5×5 angle steel according to the position of the vibrating rod. The two ends of the positioning frame are connected to the steel formwork of the high pier column with bolts. The positioning frame is provided with positioning points, which can support the vibrating rod and allow the vibrator of the vibrating rod to pass through the positioning points and enter the concrete pouring area.

5. The method for casting and vibrating large-section high pier columns according to claim 4, characterized in that: Before placing the vibrator, make a mark every L1 from the vibrator of the vibrator to the motor direction of the vibrator to control the lifting height of the vibrator.

6. The method for casting and vibrating large-section high pier columns according to claim 1, characterized in that: During the pouring process, ensure that the rising speed of the concrete is less than the vibration speed of the vibrating rod.

7. The method for casting and vibrating large-section high pier columns according to claim 1, characterized in that: In step S1, before pouring concrete, a measuring rope is provided in the pouring area for measuring and controlling the pouring height.

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