Integral hoisting construction method for pre-buried anchor bolts of column equipment

Abstract

The application discloses a kind of tower equipment pre-buried anchor bolt integral hoisting construction methods, first, the positioning axis consistent with the axis of positioning mould is ejected along the center of equipment foundation;After installing vertical support, positioning mould is hoisted as a whole, and each anchor bolt is sequentially assembled into the mounting hole of positioning mould, so that positioning mould and anchor bolt are connected into a whole in the air;The positioning mould and anchor bolt that have been assembled are hoisted into the equipment foundation insert bar, after anchor bolt anchor plate falls below horizontal support elevation, horizontal support construction is carried out, then positioning mould and anchor bolt are dropped to positioning mould support frame, anchor bolt is calibrated and reinforced, then steel binding, formwork installation and concrete pouring are carried out, equipment foundation construction is completed, and formwork is removed and positioning mould is removed.The application adopts positioning mould and anchor bolt integral assembly in the air, reduces the precision error generated by secondary assembly on site, and improves the pre-buried anchor bolt integral hoisting efficiency.

Description

Technical Field

[0001] This invention relates to the field of anchor bolt installation technology, and more specifically, to a method for the overall hoisting and installation of pre-embedded anchor bolts for tower equipment. Background Technology

[0002] During the installation of large tower equipment, the anchor bolts are pre-embedded in the reinforced concrete structure of the ring-shaped equipment foundation on the upper part of the raft. Due to the large number and weight of the anchor bolts on the equipment foundation, the adjustment time of the axis elevation during the on-site hoisting process is too long, resulting in low overall construction efficiency.

[0003] For example, during the construction of the distillation unit of the 200,000-ton-per-year high-purity polysilicon project of Xinjiang Central Hesheng Silicon Industry undertaken by China National Chemical Engineering Second Construction Group Co., Ltd., the distillation units SJ-1 and SJ-2 were raft foundations. The anchor bolts for the foundations of the distillation tower and reduction tower were M90×2720mm and M80×2500mm, respectively. There were a large number of anchor bolts on the equipment foundations. If the traditional construction method were used, the construction progress would be slow and the construction cost would be high. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for the overall hoisting construction of pre-embedded anchor bolts for tower equipment, so as to improve the overall installation efficiency of pre-embedded anchor bolts.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] A method for the overall hoisting of pre-embedded anchor bolts for tower equipment includes the following steps:

[0007] Step 1: Measure and lay out the lines.

[0008] A positioning axis, aligned with the upper axis of the positioning mold, is projected along the center of the equipment foundation.

[0009] Step two, install the positioning mold support frame.

[0010] The positioning mold support frame includes vertical support and horizontal support. First, install the vertical support, which includes multiple columns. One column is set at the center of the equipment foundation, and the remaining columns are set inside the intersection of the reinforcing bars of the equipment foundation.

[0011] Step 3: Assemble the positioning mold and anchor bolts in mid-air.

[0012] The positioning mold includes a coaxial double-layer ring and an internal support for supporting the double-layer ring. The double-layer ring has corresponding mounting holes for installing anchor bolts.

[0013] After the positioning mold is lifted as a whole, each anchor bolt is assembled into the mounting hole of the positioning mold in sequence, so that the positioning mold and the anchor bolt are connected into a whole in the air;

[0014] Step four: Install the positioning mold and anchor bolts as a whole.

[0015] The assembled positioning mold and anchor bolts are hoisted into the reinforcement bars of the equipment foundation. After the anchor bolts are lowered below the horizontal support elevation, the horizontal support is constructed. After the horizontal support is completed, the positioning mold and anchor bolts are lowered into the positioning mold support frame. During the installation process, the axis of the positioning mold corresponds to the axis of the equipment foundation.

[0016] Step 5: Anchor bolt calibration and reinforcement;

[0017] Step six: Reinforcing bar binding, formwork installation, and concrete pouring;

[0018] Step 7: Remove the positioning template.

[0019] Once the equipment foundation construction is completed, the formwork and positioning molds will be removed.

[0020] Furthermore, in step two, a stiffening beam is set at each of the longitudinal and transverse axes at the top of the positioning mold, and a lifting lug is set at each end of each stiffening beam as the main lifting point of the positioning mold, for a total of 4 main lifting points. The lifting lugs serving as the main lifting points are connected to the crane hook through steel wire ropes.

[0021] Furthermore, four lifting lugs are provided on the upper ring of the positioning mold, and these four lifting lugs are connected to the crane hook via a hand chain hoist.

[0022] Furthermore, in step three, the lifting height of the positioning mold is 40cm greater than the length of the anchor bolts.

[0023] Furthermore, in step four, when installing the horizontal support, the horizontal support is connected to the central column along the outer column to form a whole, and the horizontal support extends 500mm out of the outer column as a positioning mold placement point.

[0024] Furthermore, in step four, when installing the horizontal support, the horizontal support is placed on the temporary support angle steel and connected to the vertical support to form a whole. After the horizontal support is completed, the whole structure is lowered.

[0025] Furthermore, in step five, adjacent anchor bolts are welded together with steel bars on the anchor bolt anchor plate to form a whole, and the anchor bolts are welded together with steel bars and pre-reserved reinforcing bars in the equipment foundation in the other two directions, so that the entire anchor bolt and the equipment foundation steel bars form a whole.

[0026] Furthermore, in step seven, after the positioning template is removed, calcium-based grease is applied to the exposed threads of the anchor bolts, and they are wrapped with tape and then covered with PVC pipes for finished product protection.

[0027] Compared with traditional construction methods, this invention uses positioning molds and anchor bolts to be assembled in the air as a whole, which reduces the accuracy error caused by secondary assembly on site. Before hoisting, it is not necessary to repeatedly check the axis elevation of the anchor bolts. The axis elevation is verified when the whole is hoisted to the support frame, which improves the matching degree of the first hoisting and positioning.

[0028] This invention uses precise layout to pre-calculate and set the positioning axis of the equipment foundation and the elevation control points of the positioning mold support frame, which reduces the time for adjusting the axis elevation during the overall hoisting of the anchor bolts of large towers on site and improves the overall hoisting efficiency of the pre-embedded anchor bolts.

[0029] The main cost of using the method described in this invention is in machinery costs, while labor costs and safety measures costs are relatively small. Under the premise of ensuring safety and quality, it accelerates the construction progress and reduces the input of construction costs. Attached Figure Description

[0030] The accompanying drawings, which are provided to further illustrate the invention and form part of this application, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0031] Figure 1 This is a schematic diagram of the aerial assembly of the positioning mold and anchor bolts described in this invention;

[0032] Figure 2 This refers to the positioning mold lifting lug setting and assembly sequence described in this invention.

[0033] In the diagram, 1-upper ring, 2-lower ring, 3-internal support, 4-anchor bolt, 5-stiffening beam, 6-lifting lug, 7-positioning nut. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the present invention will be further described clearly and completely below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0035] The present invention provides a typical embodiment of a method for hoisting pre-embedded anchor bolts for tower equipment. The overall concept is to pre-install the anchor bolts in the air to form a positioning mold to form a whole, and use a truck crane for positioning and hoisting. This method solves the problem of difficult installation of large anchor bolts in the equipment foundation and positioning mold, and improves the installation accuracy of anchor bolts.

[0036] 1. Measurement and layout of control axis and elevation control points

[0037] To accelerate the installation speed and overall accuracy, first, use a string line to pop out the 45° "rice-shaped" positioning axes along the center of the equipment foundation. These positioning axes are consistent with the axes on the positioning mold to ensure that the positioning mold corresponds to the equipment foundation axes after overall hoisting.

[0038] Use a level to mark a unified elevation point along the inner side of the upper part of the reinforcement bars inserted into the raft of the equipment foundation, so that the length of the anchor bolt 4 exposed from the positioning mold + the height of the positioning mold + the size of the supporting channel steel + the surplus value from the top surface of the foundation = the height exposed from the top surface of the foundation designed in the drawing.

[0039] 2. Installation of the positioning mold support frame

[0040] The positioning mold support frame uses [16 channel steel as vertical and horizontal supports. Among them, there are a total of nine vertical support columns. One column is set at the center of the equipment foundation, and the other eight columns are evenly arranged inside the intersection of the reinforcement bars inserted into the equipment foundation. The horizontal support is connected into a whole along the outer columns and the central column. The horizontal support projects 500 mm out of the outer columns as the placement point for the positioning mold.

[0041] Since the size of the anchor plate of the anchor bolt is 360 mm and the spacing between adjacent anchor bolts 4 is 470 mm, if the horizontal support is set in advance, due to the small distance, it is difficult to construct when the positioning mold and the anchor bolt 4 are hoisted into the annular reinforcement bars of the equipment foundation as a whole. Therefore, the construction of the horizontal support needs to be carried out after the lower anchor plate of the anchor bolt 4 is hoisted as a whole. To accelerate the overall hoisting speed, calculate the bottom elevation of the horizontal support based on the exposed length of the anchor bolt 4 and weld angle steel as a temporary support during the construction of the horizontal support to reduce the installation time of the horizontal support during the overall hoisting and falling process.

[0042] 3. Reinforcement of the positioning mold and setting of lifting points

[0043] The positioning mold is a double-layer circular ring structure, as Figure 1 shown, including the upper circular ring 1 and the lower circular ring 2. The upper circular ring 1 and the lower circular ring 2 are connected into a whole through the internal support 3. The height of the positioning mold is 600 mm. Corresponding installation holes for installing the anchor bolt 4 are opened on the upper circular ring 1 and the lower circular ring 2.

[0044] To prevent the positioning mold from deforming due to stress concentration during hoisting, set HW200×200 section steel as the stiffening beam 5 along the longitudinal and transverse axis positions at the top of the positioning mold. Two lifting lugs 6 are symmetrically set at both ends of the section steel as the main lifting points of the positioning mold. During the in-air assembly process of the bolts after hoisting, to prevent the positioning mold from being affected by the weight of the anchor bolt 4 and losing stability, set a lifting lug every 45° on the positioning mold based on the position of the lifting lug of the section steel, with a total of 8 lifting point positions.

[0045] 4. In-air assembly of the positioning mold and the anchor bolt

[0046] A 50t truck crane was used to connect the wire rope to the main lifting lug to lift the positioning mold. The remaining four lifting points were connected to the hooks of the 50t truck crane using 2t hand chain hoists.

[0047] The positioning mold is lifted as a whole by the above 8 lifting points. The lifting height is about 40cm greater than the anchor bolt 4. The assembly sequence of the anchor bolt 4 in the air needs to be arranged in advance. The 25t truck crane uses slings to lift the anchor bolt 4 to the positioning mold and assemble it according to the established construction sequence.

[0048] Anchor bolt 4 aerial assembly sequence according to Figure 1 The assembly is carried out in the following order: first, assemble the anchor bolts 4 near the main lifting point, then assemble the anchor bolts 4 near the other lifting points, and finally assemble the anchor bolts 4 in the remaining parts. Each assembly area is assembled in a diagonal manner.

[0049] After each anchor bolt 4 is assembled into the positioning mold, the positioning nut 7 is fixed to the anchor bolt 4 on the upper part of the positioning mold, so that the positioning mold and the anchor bolt 4 are connected into a whole. After the whole assembly is completed in the air, the next process is carried out.

[0050] 5. The positioning mold and anchor bolts are installed as a whole.

[0051] The assembled positioning mold and anchor bolts are hoisted into the reinforcement bars of the equipment foundation. After the upper axis of the positioning mold is aligned with the axis of the equipment foundation, it is slowly lowered.

[0052] After the anchor plate of the anchor bolt falls below the horizontal support of the positioning mold, the horizontal support construction is carried out. The [16 channel steel horizontal support is placed on the temporary support angle steel and connected to the vertical support to form a whole. After the horizontal support construction is completed, the whole thing is lowered. During the descent, a plumb bob is used to check whether the axis of the positioning mold is perpendicular to the axis of the equipment foundation. If there is any deviation, it is adjusted in time. After the adjustment is completed, the positioning mold and the anchor bolt 4 are slowly lowered as a whole to the positioning mold support frame.

[0053] When positioning, the clockwise 0°, 90°, 180° and 270° lines on the positioning template should be aligned sequentially with the center line laid out on the raft foundation. After ensuring accuracy, remove the hook and proceed with the overall installation of the next equipment foundation positioning mold and anchor bolts.

[0054] During the hoisting process, the crane commander closely observed the condition of the positioning mold and anchor bolts. Dedicated personnel were assigned to monitor the entire process to ensure safety without any blind spots.

[0055] 6. Anchor bolt calibration, reinforcement, and retesting

[0056] After the anchor bolts 4 are hoisted as a whole, each anchor bolt 4 needs to be reinforced around its perimeter. Adjacent anchor bolts 4 are welded to the anchor plate with HRB400E16 steel bars to form a whole. In the other two directions of each anchor bolt 4, HRB400E32 steel bars are welded to the pre-reserved reinforcing bars of the equipment foundation to make the entire anchor bolt 4 and the equipment foundation steel bars form a whole.

[0057] After the pre-embedded anchor bolts 4 are in place, the installation dimensions of the pre-embedded anchor bolts 4 should be checked in a timely manner according to the specifications.

[0058] 7. Reinforcing bar binding and formwork installation

[0059] After the anchor bolts 4 pass inspection, the reinforcing bars are tied. During the tying of the reinforcing bars on the inner and outer sides of the equipment foundation, avoid disturbing the anchor bolts 4. During the reinforcement of the formwork, the arrangement of the tie rods should avoid the anchor bolts 4.

[0060] 8. Concrete pouring

[0061] During concrete pouring, the vibrator should avoid contact with the anchor bolts 4 while in operation. Grade 1 aggregate should be selected for the concrete. The concrete should be poured and vibrated to ensure compaction. The amount of concrete poured and the vibration time should be controlled. During concrete pouring, a dedicated person should be assigned to monitor the stability of the formwork and the compactness of the concrete. Any problems found should be dealt with in a timely manner to ensure the quality of concrete pouring.

[0062] 9. Removal of positioning templates and protection of finished products

[0063] After the equipment foundation construction is completed, the formwork and positioning molds are removed. During the removal of the positioning molds, a gas welding cutting tool is used to remove them in sections to avoid damaging the exposed parts of the anchor bolts 4. After removing the positioning formwork, the dimensions of the anchor bolts 4 must be checked to ensure correct installation. After the positioning formwork is removed, the exposed threads should be promptly coated with calcium-based grease, wrapped with tape, and then covered with PVC pipe for finished product protection, providing favorable conditions for subsequent equipment installation.

[0064] The scope of protection claimed by this invention is not limited to the specific embodiments described above. For those skilled in the art, this invention can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for the overall hoisting and installation of pre-embedded anchor bolts for tower equipment, characterized in that, Including the following steps: Step 1: Measure and lay out the lines. A positioning axis, aligned with the upper axis of the positioning mold, is projected along the center of the equipment foundation. Step two, install the positioning mold support frame. The positioning mold support frame includes vertical support and horizontal support. First, install the vertical support, which includes multiple columns. One column is set at the center of the equipment foundation, and the remaining columns are set inside the intersection of the reinforcing bars of the equipment foundation. Step 3: Assemble the positioning mold and anchor bolts in mid-air. The positioning mold includes a coaxial double-layer ring and an internal support for supporting the double-layer ring. The double-layer ring has corresponding mounting holes for installing anchor bolts. After the positioning mold is lifted as a whole, each anchor bolt is assembled into the mounting hole of the positioning mold in sequence, so that the positioning mold and the anchor bolt are connected into a whole in the air; Step four: Install the positioning mold and anchor bolts as a whole. The assembled positioning mold and anchor bolts are hoisted into the reinforcement bars of the equipment foundation. After the anchor bolts are lowered below the horizontal support elevation, the horizontal support is constructed. After the horizontal support is completed, the positioning mold and anchor bolts are lowered into the positioning mold support frame. During the installation process, the axis of the positioning mold corresponds to the axis of the equipment foundation. Step 5: Anchor bolt calibration and reinforcement; Step six: Reinforcing bar binding, formwork installation, and concrete pouring; Step 7: Remove the positioning template. Once the equipment foundation construction is completed, the formwork and positioning molds will be removed.

2. The method according to claim 1, characterized in that: In step two, a stiffening beam is set at each of the longitudinal and transverse axes at the top of the positioning mold. Each stiffening beam has a lifting lug at each end as the main lifting point of the positioning mold, for a total of 4 main lifting points. The lifting lugs serving as the main lifting points are connected to the crane hook by steel wire ropes.

3. The method according to claim 2, characterized in that: Four lifting lugs are installed on the upper ring of the positioning mold, and the four lifting lugs are connected to the crane hook by a hand chain hoist.

4. The method according to claim 1 or 3, characterized in that: In step three, the lifting height of the positioning mold is 40cm greater than the length of the anchor bolts.

5. The method according to claim 4, characterized in that: In step four, when installing the horizontal support, the horizontal support is connected to the central column along the outer column to form a whole, and the horizontal support extends 500mm out of the outer column as the positioning mold placement point.

6. The method according to claim 5, characterized in that: In step four, when installing the horizontal supports, place the horizontal supports on the temporary support angle steel and connect them with the vertical supports to form a whole. After the horizontal supports are installed, the whole structure is lowered.

7. The method according to claim 1 or 6, characterized in that: In step five, adjacent anchor bolts are welded together with steel bars on the anchor bolt anchor plate to form a whole. In the other two directions, steel bars are welded together with the pre-reserved reinforcing bars of the equipment foundation to form a whole with the steel bars of the equipment foundation.

8. The method according to claim 7, characterized in that: In step seven, after the positioning template is removed, calcium-based grease is applied to the exposed threads of the anchor bolts, and they are wrapped with tape and then covered with PVC pipes for finished product protection.

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