Method for installing steel bars using thin-walled pier column steel bar lifting tools

Abstract

The invention discloses a method for installing steel bars by using a thin-walled pier column steel bar hoisting tool, and the steps are as follows: steel bar hoisting tool → connecting the completed pier column steel bars → hoisting to the pier body operation point by a lifting device → installing and connecting the steel bars → loosening and removing the top sleeve connection → performing the next cycle operation. The invention can improve construction efficiency, speed up construction progress, reduce safety risks, and can be reused while ensuring construction quality, reducing cost investment.

Description

Technical Field

[0001] The invention relates to a bridge pier column reinforcement installation project, in particular to a method for installing reinforcement using a thin-wall pier column reinforcement hoisting tool. Technical Background

[0002] In the steel bar installation project of bridge piers, straight threaded sleeves are currently mostly used for connection. The amount of steel bar installation for bridge piers is very large, and the whole process is done at high altitude. Traditional steel bar installation requires transportation to the working surface in bundles or individually, and then installation individually. The construction efficiency is low and the progress is slow. In addition, the steel bar is heavy, and the construction risk is mostly level II to III. Therefore, the cost of manual installation is high, which has a great impact on the construction period. It is difficult to reach the progress node to complete the corresponding workload and realize the phased plan; therefore, in order to reduce the number of manual installation days and labor intensity, the use time of machine tools, the investment of auxiliary tools, the organization and management of on-site safety, etc., which are closely related to the investment of comprehensive costs, we urgently need to develop a new practice method for steel bar installation, seek benefits from safety and convenience, simplify the original installation process, and improve efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a method for installing steel bars using a thin-walled pier column steel bar lifting tool to address the deficiencies in the above-mentioned prior art, which can improve construction efficiency, speed up construction progress, reduce safety risks while ensuring construction quality, and can be reused to reduce cost investment. The steps of the present invention are as follows: steel bar lifting tool → connect the completed pier column steel bars → lift them to the pier body operation point through a lifting and hoisting device → install and connect the steel bars → loosen and remove the top sleeve connection → proceed to the next cycle operation.

[0004] The present invention is specifically implemented through the following technical scheme: A method for installing steel bars using a thin-walled pier column steel bar lifting tool comprises the following steps:

[0005] A. Production of steel bar lifting tools:

[0006] (1) Make an I-beam with a length of 4 to 4.5 meters, and drill a small hole every 11 to 15 cm on the web of the I-beam;

[0007] (2) Pass the steel rope through the small hole of the I-beam, rotate the end to form an effective overlap length, and use three locking clips to clamp and fix the overlap. The length of the steel rope can be flexibly adjusted according to the length of the main reinforcement of the hoisting pier column;

[0008] (3) Use steel bars to make a ring, drill a small hole at the bottom of the ring, pass the movable end of the steel rope through the inner ring of the ring, rotate the end of the steel rope around itself to form an effective overlap length, and fix the overlap with three locking clips;

[0009] (4) Select a connecting bolt with a nut at the end, pass the screw through the small hole of the ring formed by the steel bar, and apply butter on the contact surface between the screw and the ring to reduce friction resistance;

[0010] (5) Make a small steel plate and drill a small hole in the center;

[0011] (6) Place the small rolling bearing on the small steel plate first, then use the connecting bolts to pass through the ring, small rolling bearing and small steel plate in turn, and then tighten them with nuts. The inner ring of the small rolling bearing and the two sides of the screw of the connecting bolt are spot welded with gas shielded welding, and the outer ring of the small rolling bearing is spot welded with the small steel plate below, so as to convert the sliding friction between the rotating screw and the outer ring of the bearing into rolling friction;

[0012] (7) Weld the threaded connection sleeve to the bottom of the small steel plate;

[0013] B. Pier column reinforcement production:

[0014] According to the construction drawings, the steel bars are cut into sections, and the steel bar end threads are processed using a steel bar straight thread rolling machine in the processing plant, and then transported to the construction site by trailer;

[0015] C. Steel bar hoisting and installation:

[0016] An operation area is set up on the ground in the hardened area on site, and the processed steel bars are placed one by one. The top ends are connected with threaded connection sleeves. 30 to 35 main reinforcements of the pier body can be connected each time and connected to the lifting beam above. They are lifted to the pier body operation point by a tower crane or a crane, and after correction in place, the bottom sleeve of the main reinforcement of the pier body of this section is connected. Use a special wrench to tighten the bottom sleeve of the main reinforcement, and then loosen and remove the threaded connection sleeve at the top of this section. The installation of the main reinforcement of the pier body is completed in batches, and the next cycle of operation is carried out.

[0017] Preferably, the I-beam model is 16, and the diameter of the small hole drilled on the web is 12 mm.

[0018] Preferably, the steel rope has a length of 55 cm and a diameter of 10 mm;

[0019] Preferably, the circular ring is formed by a steel bar with a width of 12 mm and a thickness of 6 mm, a diameter of 10 to 15 cm, a bottom drilling hole of φ7 mm, and an arc transition with a length of 6 cm and a width of 7 mm is set in the prepared drilling area.

[0020] Preferably, the connecting bolt has a diameter of 6 mm and is equipped with a nut;

[0021] Preferably, the small rolling bearing is a rolling bearing with a diameter of 8 cm and a thickness of 1.5 cm;

[0022] Preferably, the small steel plate is 7 cm long, 7 cm wide, and 3 mm thick, and a 7 mm small hole is drilled at the center.

[0023] Preferably, in step C, the top end of the processed steel bar is connected to the threaded connection sleeve, and 30 to 35 main bars of the pier body can be connected each time.

[0024] The present invention provides a method for installing steel bars using a thin-walled pier column steel bar lifting tool, which has the following main advantages: it can improve construction efficiency, speed up construction progress, reduce safety risks while ensuring construction quality, and can be reused to reduce cost investment. The operator screws the steel bar to be installed into the connecting sleeve on the ground platform, and can lift 30 to 35 main bars of the pier body each time. Taking the hollow pier of this project as an example, it only takes 8 times to lift 256 main bars of the pier body to the working surface for installation, reducing the bundling operation. The workers feed the steel bars individually at high altitude and then connect them upright, and the repeated operation has high labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the overall hoisting elevation view of the present invention;

[0026] Figure 2 It is a large-scale drawing of a single lifting tool of the present invention;

[0027] In the figure: 1-I-beam, 2-steel rope, 3-circular ring, 4-connecting bolt, 5-small rolling bearing, 6-small steel plate, 7-threaded connection sleeve, 8-processed steel bar. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0030] like Figure 1-2 As shown, the steps of the method for installing steel bars by using a thin-walled pier column steel bar lifting tool of the present invention are as follows:

[0031] A. Production of steel bar lifting tools:

[0032] (1) An I-beam 1 with a length of 4 to 4.5 meters and a model number of 16 is manufactured, and small holes with a diameter of 12 mm are drilled at intervals of 11 to 15 cm on the web of the I-beam.

[0033] (2) Make a steel rope 2 with a length of 55 cm and a diameter of 10 mm. Pass the steel rope 2 through the small hole of the I-beam 1, turn the end back to form an effective overlap length, and use three locking clips to clamp and fix the overlap. The length of the steel rope 2 can be flexibly adjusted according to the length of the main reinforcement of the hoisting pier column.

[0034] (3) Make a ring 3 made of a steel bar with a width of 12 mm and a thickness of 6 mm. The diameter of the ring 3 is 10 to 15 cm. Drill a small hole with a diameter of 7 mm at the bottom of the ring 3. Pass the movable end of the steel rope 2 through the inner ring of the ring 3. The end of the steel rope 2 is rotated on itself to form an effective overlap length. The overlap is fixed with three locking clips.

[0035] (4) Make a 6 mm connecting bolt 4 with a nut at the end, pass the screw through the small hole of the ring 3 formed by the steel bar, and apply butter on the contact surface between the screw and the ring 3 to reduce friction resistance.

[0036] (5) Use a small rolling bearing 5 with a diameter of about 8 cm and a thickness of 1.5 cm. Place the small rolling bearing 5 on the small steel plate 6 first, then use the connecting bolt 4 to pass through the ring 3, the small rolling bearing 5 and the small steel plate 6 in sequence, insert the nut from the lower end of the threaded connection sleeve 7, connect it with the thread of the screw, and then tighten the nut. A nut limiter is arranged above and below the small steel plate 6 to prevent the nut from loosening and slipping due to multiple rotations of the screw; the inner ring and both sides of the screw are spot welded by gas shielded welding, and the outer ring side of the bearing is spot welded to the small steel plate below, so as to convert the sliding friction between the rotating screw and the outer ring of the bearing into rolling friction;

[0037] After the screw nut is tightened, place the small rolling bearing 5 flat on the small steel plate 6, spot weld the inner ring to both sides of the screw with gas shielded welding, and spot weld the outer ring of the bearing to the small steel plate 6 below, so as to convert the sliding friction between the rotating screw and the outer ring of the bearing into rolling friction, increase the rotation flexibility of the connecting parts between the lower and upper ends, facilitate the tightening and rotation of the straight thread, and avoid tying the upper steel rope 2.

[0038] (6) Make a small steel plate 6 with a length of 7 cm, a width of 7 cm and a thickness of 3 mm, drill a 7 mm small hole in the center, connect it with the connecting bolt 4, and install the nut.

[0039] (7) Weld the finished steel bar threaded connection sleeve 7 to the small steel plate 6. Taking this project as an example, the steel bar threaded connection sleeve 7 with a steel bar model of 28 or 32 is welded to the small steel plate 6.

[0040] B. Pier column reinforcement production:

[0041] According to the construction drawings, the materials are cut into sections, and the end threads of the steel bars are processed using a steel bar straight thread rolling machine in the processing plant, and then transported to the construction site by trailer.

[0042] C. Steel bar hoisting and installation:

[0043] An operation area is set up on the ground in the hardened area on site, and the processed steel bars 8 are placed one by one. The top ends are connected to the finished steel bar threaded connection sleeves 7. 30 to 35 pier body main bars can be connected each time, and connected to the upper I16 lifting beam. They are lifted to the pier body operation point by a tower crane or a crane, and after correction in place, the bottom sleeve of the pier body main bar of this section is connected. A special wrench is used to tighten the bottom sleeve of the main bar. The installation of the pier main bars is completed in batches, and then the top sleeve is loosened and removed to carry out the next cycle of operation.

[0044] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for installing steel bars using a thin-walled pier column steel bar lifting tool, characterized in that: The steps include: A. Production of steel bar lifting tools: (1) Make an I-beam with a length of 4 to 4.5 meters, and drill a small hole every 11 to 15 cm on the web of the I-beam; (2) Pass the steel rope through the small hole of the I-beam, rotate the end to form an effective overlap length, and use three locking clips to clamp and fix the overlap. The length of the steel rope can be flexibly adjusted according to the length of the main reinforcement of the hoisting pier column; (3) Use steel bars to make a ring, drill a small hole at the bottom of the ring, pass the movable end of the steel rope through the inner ring of the ring, rotate the end of the steel rope around itself to form an effective overlap length, and fix the overlap with three locking clips; (4) Select a connecting bolt with a nut at the end, pass the screw through the small hole of the ring formed by the steel bar, and apply butter on the contact surface between the screw and the ring to reduce friction resistance; (5) Make a small steel plate and drill a small hole in the center; (6) Place the small rolling bearing on the small steel plate first, then use the connecting bolts to pass through the ring, small rolling bearing and small steel plate in turn, and then tighten them with nuts. The inner ring of the small rolling bearing and the two sides of the screw of the connecting bolt are spot welded with gas shielded welding, and the outer ring of the small rolling bearing is spot welded with the small steel plate below, so as to convert the sliding friction between the rotating screw and the outer ring of the bearing into rolling friction; (7) Weld the threaded connection sleeve to the bottom of the small steel plate; B. Pier column reinforcement production: According to the construction drawings, the steel bars are cut into sections, and the steel bar end threads are processed using a steel bar straight thread rolling machine in the processing plant, and then transported to the construction site by trailer; C. Steel bar hoisting and installation: An operation area is set up on the ground in the hardened area on site, and the processed steel bars are placed one by one. The top ends are connected to the threaded connection sleeves and connected to the lifting beams above. They are lifted to the pier operation point by a tower crane or a crane. After correction and positioning, the bottom sleeves of the main reinforcement of the pier body of this section are connected. A special wrench is used to tighten the bottom sleeves of the main reinforcement, and then the threaded connection sleeves at the top of this section are loosened and removed. The installation of the main reinforcement of the pier body is completed in batches, and the next cycle of operation is carried out.

2. The method for installing steel bars using a thin-walled pier column steel bar lifting tool according to claim 1, characterized in that: The I-beam model is 16, and the diameter of the small hole drilled on the web is 12 mm.

3. The method for installing steel bars using a thin-walled pier column steel bar lifting tool according to claim 1, characterized in that: The steel rope has a length of 55 cm and a diameter of 10 mm.

4. The method for installing steel bars using a thin-walled pier column steel bar lifting tool according to claim 1, characterized in that: The circular ring is formed by a steel bar with a width of 12 mm and a thickness of 6 mm, a diameter of 10 to 15 cm, a bottom hole with a diameter of φ7 mm, and an arc transition with a length of 6 cm and a width of 7 mm is arranged in the prepared drilling area.

5. The method for installing steel bars using a thin-walled pier column steel bar lifting tool according to claim 1, characterized in that: The connecting bolt has a diameter of 6 mm and is equipped with a nut.

6. A method for installing steel bars using a thin-walled pier column steel bar lifting tool according to claim 1, characterized in that: The small rolling bearing is a rolling bearing with a diameter of 8 cm and a thickness of 1.5 cm.

7. The method for installing steel bars using a thin-walled pier column steel bar lifting tool according to claim 1, characterized in that: The small steel plate is 7 cm long, 7 cm wide and 3 mm thick, and a 7 mm small hole is drilled in the center.

8. The method for installing steel bars using a thin-walled pier column steel bar lifting tool according to claim 1, characterized in that: In step C, the top end of the processed steel bar is connected to the threaded connection sleeve, and 30 to 35 main bars of the pier body can be connected each time.

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