Positioning mechanism of large embedded foundation bolt connected with flange plate at bottom end of steel chimney

Abstract

The utility model discloses a positioning mechanism of large -scale pre -buried anchor bolt of connection steel quality chimney bottom end flange disc, has solved the problem of time -consuming and labor -intensive and the poor installation accuracy of large -scale pre -buried anchor bolt positioning of prior art, including square concrete foundation platform (1), on the top end surface of square concrete foundation platform (1), the main reinforcement (2) in the ring concrete step of pre -pouring is constructed, the horizontal lower ring steel sheet (3) is welded and is connected on the main reinforcement (2), the outer circle lower -through -connection hole (36) of large -scale pre -buried anchor bolt is provided on the horizontal lower ring steel sheet (3), the upper end between each large -scale pre -buried anchor bolt (5) that sets up on the outer circumference of horizontal lower ring steel sheet (3) is provided with horizontal upper ring steel sheet (4), and the outer circle upper -through -connection hole (46) is arranged with equal interval radian on the horizontal upper ring steel sheet (4), the utility model improves the installation accuracy of pre -buried anchor bolt, improves construction efficiency.

Description

Technical Field

[0001] This utility model relates to the foundation of a steel chimney at the tail end of a gas turbine in a gas-fired power plant, and particularly to a positioning mechanism for a large pre-embedded anchor bolt that connects to the bottom flange of the steel chimney. Background Technology

[0002] In the civil construction of gas turbine power plants, the tail flue of the gas turbine power generation system is generally constructed using a steel chimney. The construction process for this type of steel chimney is as follows: First, a square concrete foundation platform is built. A ring-shaped steel reinforcement frame is then constructed on the concrete foundation platform. Large pre-embedded anchor bolts are positioned and fixed to the ring-shaped steel reinforcement frame using a hoisting method. Next, a ring-shaped concrete pouring formwork is erected on both sides of the ring frame. After pouring the concrete, a ring-shaped concrete foundation step is formed. Large anchor bolts are pre-embedded on the top surface of this ring-shaped concrete foundation step. Then, the flange at the bottom of the first section of the ring-shaped steel chimney wall is hoisted to the pre-embedded large anchor bolts and firmly fixed. The second section of the ring-shaped steel chimney wall is then hoisted onto the first section of the ring-shaped steel chimney wall. The top of the chimney wall is welded together with the top of the chimney wall. This process is repeated upwards to complete the welding and assembly of the entire steel chimney wall, thus constructing the entire steel chimney. The positioning of the large embedded anchor bolts is crucial in this process. Because these large anchor bolts are long and heavy, they require hoisting to position and connect to the annular steel reinforcement frame. During installation, the anchor bolts are prone to shifting and tilting, making it difficult to guarantee installation accuracy and directly affecting the smooth connection and installation of the subsequent first section of the annular steel chimney wall. Furthermore, the installation process is cumbersome, requiring significant manpower and time, resulting in low construction efficiency. Existing installation methods are insufficient to meet construction requirements. Therefore, a new positioning mechanism for large embedded anchor bolts needs to be developed to solve these problems. Summary of the Invention

[0003] This utility model provides a positioning mechanism for large pre-embedded anchor bolts that connect to the bottom flange of a steel chimney, solving the technical problems of time-consuming and labor-intensive positioning and poor installation accuracy of large pre-embedded anchor bolts in the prior art.

[0004] This utility model solves the above technical problems through the following technical solution: A positioning mechanism for large pre-embedded anchor bolts connecting the bottom flange of a steel chimney, comprising a square concrete foundation cap. On the top end face of the square concrete foundation cap, the main reinforcement bars of a pre-poured annular concrete step are constructed, and a horizontal lower annular steel plate is welded and connected to the main reinforcement bars. The horizontal lower annular steel plate is provided with outer-circle lower through holes for the large pre-embedded anchor bolts, and the outer-circle lower through holes are arranged on the outer circumference of the horizontal lower annular steel plate at equal radian intervals. The lower ends of the large pre-embedded anchor bolts are arranged in the outer-circle lower through holes. A lower backing plate and a first fastening nut are respectively arranged at the lower end of each large pre-embedded anchor bolt below the horizontal lower annular steel plate, and a second fastening nut is arranged on each large pre-embedded anchor bolt above the horizontal lower annular steel plate. A horizontal upper annular steel plate is arranged between the upper ends of the large pre-embedded anchor bolts disposed on the outer circumference of the horizontal lower annular steel plate. Outer-circle upper through holes are arranged on the horizontal upper annular steel plate at equal radian intervals, the upper ends of the large pre-embedded anchor bolts are arranged in the outer-circle upper through holes. An upper backing plate and a third fastening nut are respectively arranged on each large pre-embedded anchor bolt below the horizontal upper annular steel plate, and a fourth fastening nut is arranged on each large pre-embedded anchor bolt above the horizontal upper annular steel plate.

[0005] The horizontal upper annular steel plate is formed by splicing four arc-shaped steel plates each with a 90-degree radian, that is, composed of a first upper horizontal arc-shaped steel plate, a second upper horizontal arc-shaped steel plate, a third upper horizontal arc-shaped steel plate and a fourth upper horizontal arc-shaped steel plate, and an upper connecting plate is arranged at the splicing position between every two adjacent upper horizontal arc-shaped steel plates. Inner-circle upper through holes arranged at equal radian intervals are provided on the inner side of the outer-circle upper through holes arranged at equal radian intervals on the horizontal upper annular steel plate.

[0006] A "ye"-shaped horizontal support frame is arranged between the third upper horizontal arc-shaped steel plate and the fourth upper horizontal arc-shaped steel plate; an inverted "ye"-shaped horizontal support frame is arranged between the first upper horizontal arc-shaped steel plate and the second upper horizontal arc-shaped steel plate.

[0007] The horizontal lower annular steel plate is formed by splicing four arc-shaped steel plates each with a 90-degree radian, that is, composed of a fifth lower horizontal arc-shaped steel plate, a sixth lower horizontal arc-shaped steel plate, a seventh lower horizontal arc-shaped steel plate and an eighth lower horizontal arc-shaped steel plate, and a lower connecting plate is arranged at the splicing position between every two adjacent lower horizontal arc-shaped steel plates. Inner-circle lower through holes arranged at equal radian intervals are provided on the inner side of the outer-circle lower through holes arranged at equal radian intervals on the horizontal lower annular steel plate.

[0008] A lower "ye"-shaped horizontal support frame is arranged between the seventh lower horizontal arc-shaped steel plate and the eighth lower horizontal arc-shaped steel plate; a lower inverted "ye"-shaped horizontal support frame is arranged between the fifth lower horizontal arc-shaped steel plate and the sixth lower horizontal arc-shaped steel plate.

[0009] This invention improves the installation accuracy of pre-embedded anchor bolts, simplifies the pre-embedded positioning and installation procedure, increases construction efficiency, and reduces construction costs. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model from a top view. Figure 2 yes Figure 1 Sectional view along line AA in the middle; Figure 3 This is a schematic diagram of the horizontal annular steel plate 3 of this utility model; Figure 4 This is a schematic diagram of the structure of the horizontal annular steel plate 4 of this utility model. Detailed Implementation

[0011] The present invention will now be described in detail with reference to the accompanying drawings: A positioning mechanism for large pre-embedded anchor bolts connecting to the bottom flange of a steel chimney includes a square concrete foundation 1. On the top surface of the square concrete foundation 1, a main reinforcing bar 2 is constructed within a pre-cast annular concrete step. The main reinforcing bar 2 can be pre-embedded during the pouring of the concrete foundation 1, or it can be constructed by rebar installation after the concrete foundation 1 is completed. A horizontal lower annular steel plate 3 is welded to the main reinforcing bar 2. The horizontal lower annular steel plate 3 serves as a base for positioning the bottom end of the large pre-embedded anchor bolt 5. The horizontal lower annular steel plate 3 is provided with outer ring lower through holes 36 for large pre-embedded anchor bolts. These outer ring lower through holes 36 are evenly spaced and arranged at arc angles on the outer circumference of the plate. The position of each outer ring lower through hole 36 is determined according to the design position of the large pre-embedded anchor bolt 5. Each large pre-embedded anchor bolt 5 is hoisted and installed in the corresponding outer ring lower through hole 36 on the horizontal lower annular steel plate 3 using a hoisting device. The lower end of the large pre-embedded anchor bolt 5 is positioned in the outer ring lower through hole 36 below the horizontal lower annular steel plate 3. The lower end of each large embedded anchor bolt 5 is provided with a lower pad 6 and a first fastening nut 7. A second fastening nut 8 is provided on the large embedded anchor bolt 5 above the horizontal lower annular steel plate 3. The large embedded anchor bolt 5 is fixed by the first fastening nut 7 and the second fastening nut 8. A horizontal upper annular steel plate 4 is provided between the upper ends of each large embedded anchor bolt 5 on the outer circumference of the horizontal lower annular steel plate 3. The horizontal upper annular steel plate 4 and the horizontal lower annular steel plate 3 are arranged parallel to each other and correspond to each other, together completing the fixing of each large embedded anchor bolt. The anchor bolts 5 are positioned and fixed by means of an outer ring through hole 46 arranged at equal intervals on the horizontal annular steel plate 4. The upper end of the large pre-embedded anchor bolt 5 is set in the outer ring through hole 46. An upper pad 10 and a third fastening nut 9 are respectively set on the large pre-embedded anchor bolt 5 below the horizontal annular steel plate 4. A fourth fastening nut 11 is set on the large pre-embedded anchor bolt 5 above the horizontal annular steel plate 4. The third fastening nut 9 and the fourth fastening nut 11 fix the upper end of the large pre-embedded anchor bolt 5.

[0012] The horizontal annular steel plate 4 is composed of four 90-degree arc-shaped steel plates spliced ​​together, namely, the first upper horizontal arc-shaped steel plate 41, the second upper horizontal arc-shaped steel plate 42, the third upper horizontal arc-shaped steel plate 43, and the fourth upper horizontal arc-shaped steel plate 44. An upper connecting plate 45 is provided at the splicing point of two adjacent upper horizontal arc-shaped steel plates. On the horizontal annular steel plate 4, through holes 46 are arranged at equal intervals on the outer ring with equal intervals on the inner ring with equal intervals on the inner ring. The way in which the four upper horizontal arc-shaped steel plates are joined together to form the horizontal annular steel plate 4 facilitates hoisting and positioning.

[0013] A "ye"-shaped horizontal support frame 401 is arranged between the third upper horizontal arc steel plate 43 and the fourth upper horizontal arc steel plate 44; an inverted "ye"-shaped horizontal support frame 402 is arranged between the first upper horizontal arc steel plate 41 and the second upper horizontal arc steel plate 42; these two horizontal support frames ensure the stability of the annular steel plate and can resist the impact force generated during subsequent concrete pouring.

[0014] The lower horizontal annular steel plate 3 is formed by splicing four arc steel plates each with a 90-degree radian, that is, it is composed of the fifth lower horizontal arc steel plate 31, the sixth lower horizontal arc steel plate 32, the seventh lower horizontal arc steel plate 33 and the eighth lower horizontal arc steel plate 34, and a lower connecting plate 35 is arranged at the splicing position of two adjacent lower horizontal arc steel plates; inner-circle lower through holes 36 arranged at equal radian intervals are arranged on the inner side of outer-circle lower through holes 37 arranged at equal radian intervals on the lower horizontal annular steel plate 3.

[0015] A lower "ye"-shaped horizontal support frame is arranged between the seventh lower horizontal arc steel plate 33 and the eighth lower horizontal arc steel plate 34; a lower inverted "ye"-shaped horizontal support frame is arranged between the fifth lower horizontal arc steel plate 31 and the sixth lower horizontal arc steel plate 32.

[0016] The construction process of the utility model is as follows: Step 1: Fabricate the lower horizontal annular steel plate 3 and the upper horizontal annular steel plate 4 according to the shape and size of the pre-installed bottom flange of the steel chimney, and machine corresponding bolt through holes on the lower horizontal annular steel plate 3 and the upper horizontal annular steel plate 4 according to the positions of the screw holes on the bottom flange of the steel chimney; the lower horizontal annular steel plate 3 is formed by splicing four arc steel plates each with a 90-degree radian; the upper horizontal annular steel plate 4 is formed by splicing four arc steel plates each with a 90-degree radian; Step 2: Firstly, the lower horizontal annular steel plate 3 composed of the fifth lower horizontal arc steel plate 31, the sixth lower horizontal arc steel plate 32, the seventh lower horizontal arc steel plate 33 and the eighth lower horizontal arc steel plate 34 is positioned and welded on the main reinforcement 2 in the annular concrete step, two adjacent lower horizontal arc steel plates are connected by welding the lower connecting plate 35, and kept in a horizontal state; the main reinforcements 2 on both sides of the lower horizontal annular steel plate 3 can be higher than the lower horizontal annular steel plate 3; Step 3: Use hoisting equipment to sequentially pass the lower end of each large pre-embedded anchor bolt 5 through the corresponding bolt through hole on the lower horizontal annular steel plate 3, and fasten them through the lower backing plate 6, the first fastening nut 7 and the second fastening nut 8, so that the large pre-embedded anchor bolts 5 are fixed on the lower horizontal annular steel plate 3; Fourth step: The first upper horizontal arc-shaped steel plate 41 is hoisted and connected directly above the fifth lower horizontal arc-shaped steel plate 31, so that the large pre-embedded anchor bolts 5 are inserted into the corresponding through bolt holes on the first upper horizontal arc-shaped steel plate 41, and fixed by the upper pad 10, the third fastening nut 9 and the fourth fastening nut 11. The second upper horizontal arc-shaped steel plate 42, the third upper horizontal arc-shaped steel plate 43 and the fourth upper horizontal arc-shaped steel plate 44 are fixed in the same way; thus completing the positioning and fixing of all the large pre-embedded anchor bolts 5. Step 5: Erect ring formwork on both sides of the main reinforcement 2 in the pre-cast ring concrete step to complete the casting system of the ring concrete step. Step 6: Pour concrete for the annular concrete step. The top surface of the concrete pouring should be lower than the upper threaded section of the large embedded anchor bolt 5 below the horizontal annular steel plate 4. Step 7: After the concrete has set, first remove the fourth fastening nut 11 by rotating it. Then, remove the horizontal ring steel plate 4, the upper pad 10, and the third fastening nut 9. This completes the pre-embedding of the large embedded anchor bolts for the bottom flange of the steel chimney.

Claims

1. A positioning mechanism for large pre-embedded anchor bolts connecting to the bottom flange of a steel chimney, comprising a square concrete foundation (1), wherein main reinforcing bars (2) are constructed in a pre-cast annular concrete step on the top surface of the square concrete foundation (1), characterized in that, A lower horizontal annular steel plate (3) is welded and connected to the main reinforcement (2), and the lower horizontal annular steel plate (3) is provided with outer-circle lower through holes (36) for large pre-embedded anchor bolts, which are arranged on the outer circumference of the lower horizontal annular steel plate (3) at equal angular intervals; the lower ends of the large pre-embedded anchor bolts (5) are arranged in the outer-circle lower through holes (36), and the lower end of each large pre-embedded anchor bolt (5) below the lower horizontal annular steel plate (3) is respectively provided with a lower backing plate (6) and a first fastening nut (7), and the part of the large pre-embedded anchor bolt (5) above the lower horizontal annular steel plate (3) is provided with a second fastening nut (8); an upper horizontal annular steel plate (4) is arranged between the upper ends of the large pre-embedded anchor bolts (5) disposed on the outer circumference of the lower horizontal annular steel plate (3), the upper horizontal annular steel plate (4) is provided with outer-circle upper through holes (46) arranged at equal angular intervals, the upper ends of the large pre-embedded anchor bolts (5) are arranged in the outer-circle upper through holes (46), the part of each large pre-embedded anchor bolt (5) below the upper horizontal annular steel plate (4) is respectively provided with an upper backing plate (10) and a third fastening nut (9), and the part of the large pre-embedded anchor bolt (5) above the upper horizontal annular steel plate (4) is provided with a fourth fastening nut (11).

2. The positioning mechanism for a large pre-embedded anchor bolt connecting the bottom flange of a steel chimney according to claim 1, characterized in that, The upper horizontal annular steel plate (4) is formed by splicing four arc-shaped steel plates each with a 90-degree radian, that is, composed of a first upper horizontal arc-shaped steel plate (41), a second upper horizontal arc-shaped steel plate (42), a third upper horizontal arc-shaped steel plate (43) and a fourth upper horizontal arc-shaped steel plate (44), and an upper connection plate (45) is arranged at the splicing position between two adjacent upper horizontal arc-shaped steel plates; inner-circle upper through holes (47) arranged at equal angular intervals are provided on the inner side of the outer-circle upper through holes (46) arranged at equal angular intervals on the upper horizontal annular steel plate (4).

3. The positioning mechanism for a large pre-embedded anchor bolt connecting the bottom flange of a steel chimney according to claim 2, characterized in that, A "ye"-shaped horizontal support frame (401) is arranged between the third upper horizontal arc-shaped steel plate (43) and the fourth upper horizontal arc-shaped steel plate (44); an inverted "ye"-shaped horizontal support frame (402) is arranged between the first upper horizontal arc-shaped steel plate (41) and the second upper horizontal arc-shaped steel plate (42).

4. The positioning mechanism for a large pre-embedded anchor bolt connecting the bottom flange of a steel chimney according to claim 1, characterized in that, The lower horizontal annular steel plate (3) is formed by splicing four arc-shaped steel plates each with a 90-degree radian, that is, composed of a fifth lower horizontal arc-shaped steel plate (31), a sixth lower horizontal arc-shaped steel plate (32), a seventh lower horizontal arc-shaped steel plate (33) and an eighth lower horizontal arc-shaped steel plate (34), and a lower connection plate (35) is arranged at the splicing position between two adjacent lower horizontal arc-shaped steel plates; inner-circle lower through holes (37) arranged at equal angular intervals are provided on the inner side of the outer-circle lower through holes (36) arranged at equal angular intervals on the lower horizontal annular steel plate (3).

5. The positioning mechanism for a large pre-embedded anchor bolt connecting the bottom flange of a steel chimney according to claim 4, characterized in that, A lower "ye"-shaped horizontal support frame is arranged between the seventh lower horizontal arc-shaped steel plate (33) and the eighth lower horizontal arc-shaped steel plate (34); a lower inverted "ye"-shaped horizontal support frame is arranged between the fifth lower horizontal arc-shaped steel plate (31) and the sixth lower horizontal arc-shaped steel plate (32).

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