A verticality adjusting device and its using method for the construction of "one pile and two columns"

Abstract

The present invention relates to a verticality adjustment device for "one pile and two columns" construction and a method for using the device. The verticality adjustment device comprises a base, a vertical adjustment plate, and a vertical adjustment frame. The base is used to be fixed at the opening of the pile hole, the base is rectangular, and an avoidance hole corresponding to the pile hole is opened at the center of the base. The vertical adjustment plate is placed on the base, and the vertical adjustment plate is in the shape of a "well". It comprises a first adjustment frame for allowing double steel pipe columns to pass through and a positioning frame fixed on each side of the first adjustment frame. The first adjustment frame is provided with a first adjustment bolt for adjusting the verticality of the double steel pipe columns, and the positioning frame is provided with a second adjustment bolt for adjusting the flatness of the vertical adjustment plate. The first adjustment frame is provided corresponding to the avoidance hole. The vertical adjustment frame comprises a support leg fixed on the base and an adjustment frame fixed on the upper part of the support leg. The adjustment frame comprises a second adjustment frame corresponding to the upper and lower parts of the first adjustment frame. The second adjustment frame is provided with a third adjustment bolt for adjusting the verticality of the double steel pipe columns. The verticality adjustment accuracy of the double steel pipe columns is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground structure construction, and in particular relates to a verticality adjustment device for "one pile and two columns" construction and a method for using the device. Background Art

[0002] With the rapid development of national technology and economy, large-scale construction projects are developing in the direction of height and depth. Compared with the traditional open forward construction method, the reverse construction method of underground projects has the advantages of reducing foundation pit deformation, saving support costs, shortening construction period, etc. It is an energy-saving and environmentally friendly green construction technology, which has led to the increasingly widespread application of reverse construction technology.

[0003] Reverse construction methods include "one pile, one column" and "one pile, two columns." These two methods serve as the primary support for the completed main structure and construction loads. After the underground structure is completed, the steel pipe columns are generally encased in concrete to serve as the permanent load-bearing columns of the basement structure. Therefore, the positioning and verticality of the steel pipe columns must be strictly controlled to meet design requirements. Excessive verticality of the steel pipe columns will increase the additional bending moment of the columns when bearing loads and create difficulties in the construction of the columns encased in concrete. The "one pile, two columns" construction method requires both columns to be lowered and adjusted simultaneously, making verticality control even more difficult and construction more challenging. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a verticality adjustment device and method for use for "one pile and two columns" construction, so as to solve the problems in the prior art of difficulty in adjusting the verticality of steel pipe columns and the high construction difficulty during "one pile and two columns" construction.

[0005] To achieve the above-mentioned purpose, the technical solution of the verticality adjustment device for "one pile and two columns" construction adopted by the present invention is:

[0006] A verticality adjustment device for "one pile and two columns" construction, comprising:

[0007] Base: used to be fixed at the opening of the pile hole. The base is rectangular, and a avoidance hole corresponding to the pile hole is opened in the center of the base;

[0008] Vertical adjustment plate: Placed on the base, the vertical adjustment plate is in the shape of a "well" and includes a first adjustment frame for the double steel pipe columns to pass through and a positioning frame fixed to each side of the first adjustment frame. The first adjustment frame is provided with a first adjustment bolt for adjusting the verticality of the double steel pipe columns, and the positioning frame is provided with a second adjustment bolt for adjusting the flatness of the vertical adjustment plate; the first adjustment frame is provided corresponding to the avoidance hole;

[0009] Vertical adjustment frame: includes a support leg fixed on the base and an adjustment frame fixed on the upper part of the support leg. The adjustment frame includes a second adjustment frame corresponding to the first adjustment frame above and below. The second adjustment frame is provided with a third adjustment bolt for adjusting the verticality of the double steel pipe column.

[0010] The verticality adjustment device for "one pile and two columns" construction in the present invention includes a base, a vertical adjustment plate arranged on the base, and a vertical adjustment frame fixed on the base. Specifically, the vertical adjustment plate includes a first adjustment frame and a positioning frame. The first adjustment frame is provided with a first adjustment bolt, and the first adjustment bolt can perform a preliminary adjustment on the verticality of the double steel pipe columns; the vertical adjustment frame includes a support leg fixed on the base and an adjustment frame fixed on the upper part of the support leg. The adjustment frame includes a second adjustment frame corresponding to the first adjustment frame above and below. The second adjustment frame is provided with a third adjustment bolt. The third adjustment bolt is used to perform a second adjustment on the verticality of the double steel pipe columns. The structural setting of the adjustment device of the present invention can adjust the verticality of the double steel pipe columns twice, thereby ensuring the verticality adjustment accuracy of the double steel pipe columns.

[0011] Furthermore, the first adjustment frame and the second adjustment frame are both rectangular frames, the first adjustment frame is provided with six first adjustment bolts, and the second adjustment frame is provided with six third adjustment bolts.

[0012] Beneficial effect: The first adjustment frame and the second adjustment frame are arranged in a rectangular shape, which facilitates the arrangement of the first adjustment bolt and the third adjustment bolt.

[0013] An obliquely arranged reinforcement rib is fixed between the adjustment frame and the supporting legs.

[0014] Beneficial effect: ensuring that the vertical adjustment frame has a higher structural strength.

[0015] A ladder is provided between the adjustment frame and the base.

[0016] Beneficial effect: It is convenient for construction workers to move up and down between the adjustment frame and the base, so as to facilitate adjustment of the third adjustment bolt of the second adjustment frame of the adjustment frame.

[0017] To achieve the above-mentioned purpose, the technical solution of the method for using a vertical adjustment device for "one pile and two columns" construction adopted by the present invention is:

[0018] A method for using a vertical adjustment device for "one pile and two columns" construction, comprising:

[0019] This method is used based on the verticality adjustment device used in the "one pile and two columns" construction;

[0020] Step 1: Pile foundation drilling, using a rotary drilling machine to form a variable diameter pile hole with a larger top and a smaller bottom;

[0021] Step 2: Install the base; make the center of the base coaxial with the center of the pile hole and then fix the base to the ground;

[0022] Step 3: Hoist the steel cage into the pile hole; hoist the steel cage in sections and weld the joints of two adjacent sections of the steel cage together;

[0023] Step 4: Install the vertical adjustment plate; make the direction of the vertical adjustment plate consistent with the design direction of the double steel pipe column;

[0024] Step 5: Hoist and position the double steel pipe columns. Use the crawler crane hook to hoist the double steel pipe columns so that their positioning direction is consistent with the design direction on the drawing. After the double steel pipe columns are hoisted into place, check their elevation and position. After the check is completed, weld positioning columns around the double steel pipe columns to support them on the vertical adjustment plate through the positioning columns. Release the crawler crane hook. Then, turn on the laser inclinometer to dynamically observe the verticality of the double steel pipe columns. Perform preliminary verticality adjustments on the double steel pipe columns by adjusting the first adjustment bolt on the first adjustment frame.

[0025] Step 6: Hoisting and installation of the vertical adjustment frame; after the double steel pipe columns are adjusted vertically in the vertical adjustment plate to meet the design requirements, use a crawler crane to hoist the vertical adjustment frame. After the vertical adjustment frame is positioned, it is fixedly connected to the base. After the vertical adjustment frame is installed, the upper end of the double steel pipe columns is located above the vertical adjustment frame. Adjust the third adjusting bolt on the second adjusting frame to perform a secondary vertical adjustment of the double steel pipe columns.

[0026] Beneficial effect: The method for using the verticality adjustment device for "one pile and two columns" construction of the present invention is as follows: after the double steel pipe columns are hoisted into the vertical adjustment plate and adjusted into position, the first adjusting bolt on the first adjusting frame is adjusted. The first adjusting bolt can perform a preliminary adjustment on the verticality of the double steel pipe columns. After the preliminary adjustment, the verticality of the double steel pipe columns is relatively precise and is hung on the vertical adjustment plate through the positioning column. After the verticality of the double steel pipe columns is preliminarily adjusted, the vertical adjustment frame is hoisted and fixed. At this time, the upper end of the vertical adjustment frame is located above the vertical adjustment frame. The third adjusting bolt on the second adjusting frame of the vertical adjustment frame is adjusted to perform a secondary adjustment of the verticality of the double pipe columns. When the third adjusting bolt adjusts the verticality of the double steel pipe columns, the double steel pipe columns perform a slight adjustment with the contact position of the positioning column and the vertical adjustment frame as the center of the circle, so that the verticality of the double steel pipe columns is more precise.

[0027] Furthermore, in step 4, after the vertical adjustment plate is placed, the second adjustment bolt on the positioning frame is adjusted to check the flatness of the vertical adjustment plate itself, and the first adjustment bolt on the vertical adjustment plate is tightened to ensure that the first adjustment bolt can move freely.

[0028] Beneficial effect: The provision of the second adjusting bolt can facilitate the adjustment of the flatness of the vertical adjustment plate.

[0029] In step five, when the double steel pipe columns pass through the first adjustment frame of the vertical adjustment plate, the hoisting process should be carried out slowly. During the hoisting process, personnel should be arranged to gently support the double steel pipe columns to ensure that the double steel pipe columns are offset within a smaller range.

[0030] Beneficial effects: slow down the speed when hoisting the double steel pipe columns and arrange personnel to gently support the double steel pipe columns when hoisting them to avoid collision and damage to the double steel pipe columns during hoisting.

[0031] In step five, the elevation verification of the double steel pipe column is mainly carried out through dual control of the elevation control line of the outer wall of the double steel pipe column and the elevation of the cross steel plate in the center of the steel pipe column; the position verification of the double steel pipe column is mainly carried out through dual control of the position control line engraved on the base and the positioning coordinates of the center point of the double steel pipe column.

[0032] Beneficial effect: ensuring that the elevation of the double steel pipe column is more accurate and that the position of the double steel pipe column is more accurate.

[0033] The double steel pipe columns are connected by steel plates, and the steel plates are arranged at intervals in the axial direction of the steel pipe columns.

[0034] Beneficial effects: The connection between the double steel pipe columns is simpler and more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the base in the present invention;

[0036] Figure 2 It is a structural schematic diagram of the vertical adjustment plate in the present invention;

[0037] Figure 3 It is a structural schematic diagram of the vertical adjustment frame in the present invention;

[0038] Figure 4 This is a diagram showing the use of the verticality adjustment device for "one pile and two columns" construction in the present invention;

[0039] Figure 5 It is a structural schematic diagram of two steel pipe columns in the present invention.

[0040] Figure markings: 1-base; 2-avoidance hole; 3-first steel section; 4-second steel section; 5-third steel section; 6-fourth steel section; 7-first connecting rod; 8-second connecting rod; 9-third connecting rod; 10-fourth connecting rod; 11-first adjusting bolt; 12-second adjusting bolt; 13-vertical adjustment plate; 14-first adjusting frame; 15-positioning frame; 16-vertical adjustment frame; 17-support leg; 18-adjustment frame; 19-first support rod; 20-second support rod; 21-third support rod; 22-fourth support rod; 23-second adjusting frame; 24-third adjusting bolt; 25-reinforcement rib; 26-ladder; 27-double steel pipe column; 28-steel plate. DETAILED DESCRIPTION

[0041] The following is a further detailed description of a "one pile two columns" construction verticality adjustment device and its use method of the present invention in conjunction with the accompanying drawings and specific embodiments:

[0042] The verticality adjustment device for "one pile and two columns" construction of the present invention is a device for adjusting the verticality of double steel pipe columns. The double steel pipe columns 27 are two steel pipe columns arranged side by side with a spacing of steel plates 28, and each steel pipe column is welded with studs arranged in a row on the circumference. In this embodiment, the steel plate 28 between the two steel pipe columns is a Q345B steel plate. The length of the steel plate 28 is 14 mm, and multiple steel plates 28 are arranged at intervals along the extension direction of the steel pipe column. The spacing between adjacent steel plates 28 is 4000 mm. When welding the steel plates 28, the steel plates 28 should avoid the studs on the circumference of the steel pipe column.

[0043] Before connecting the double steel pipe columns 27, ensure that their axes are aligned and horizontal when laid flat. The period between connection and hoisting should not exceed 24 hours to prevent inelastic deformation of the pile body due to its own weight or other factors. After connection, measure the surface flatness of each column using a laser inclinometer and weld the laser inclinometer mounting plate to ensure the laser inclinometer's accuracy after vertical hoisting.

[0044] "One pile and two columns" construction vertical adjustment device Figure 1 As shown, it includes a chassis, a vertical adjustment plate 13 and a vertical adjustment frame 16. Specifically, the base 1 is fixed at the mouth of the pile hole. The base 1 is rectangular and includes a rectangular frame welded from four I-beams and a rectangular steel plate welded to the bottom of the rectangular frame. An avoidance hole 2 is opened at the center of the rectangular steel plate. In this embodiment, the avoidance hole 2 is a circular hole and the avoidance hole 2 is arranged corresponding to the pile hole.

[0045] A vertical adjustment plate 13 is provided in the rectangular frame of the base 1. The vertical adjustment plate 13 is in the shape of a "well" and includes a first adjustment frame 14 and a positioning frame 15 for the double steel pipe column 27 to pass through. In this embodiment, the first adjustment frame 14 is a rectangular frame, and the positioning frame 15 is also a rectangular frame. A rectangular frame is provided on each side of the first adjustment frame 14. In this way, the first adjustment frame 14 and the positioning frames 15 provided on each side of the first adjustment frame 14 form a "well" shaped structure.

[0046] In this embodiment, the vertical adjustment plate 13 includes a first section steel 3 and a second section steel 4 arranged in parallel and spaced apart in the left and right directions, and a third section steel 5 and a fourth section steel 6 arranged in parallel and spaced apart in the front and rear directions. The first section steel 3 is welded to the third section steel 5 and the fourth section steel 6 respectively, and the front end of the first section steel 3 is located in front of the third section steel 5, and the rear end of the first section steel 3 is located behind the third section steel 5; the second section steel 4 is welded to the third section steel 5 and the fourth section steel 6 respectively, and the front end of the second section steel 4 is located in front of the third section steel 5, and the rear end of the second section steel 4 is located behind the fourth section steel 6; the front end of the first section steel 3 and the front end of the second section steel 4 are welded with a first connecting rod 7, and the front end of the first section steel 3 is welded to the front end of the second section steel 4. A second connecting rod 8 is welded to the rear end of the second section steel 4; the left end of the third section steel 5 is located on the left side of the first section steel 3, the right end of the third section steel 5 is located on the right side of the second section steel 4, the left end of the fourth section steel 6 is located on the left side of the first section steel 3, and the right end of the fourth section steel 6 is located on the right side of the second section steel 4. The left end of the third section steel 5 and the left end of the fourth section steel 6 are fixedly connected with a third connecting rod 9, and the right end of the third section steel 5 and the right end of the fourth section steel 6 are fixedly connected with a fourth connecting rod 10. In this embodiment, the first section steel 3, the second section steel 4, the third section steel 5, the fourth section steel 6, the first connecting rod 7, the second connecting rod 8, the third connecting rod 9, and the fourth connecting rod 10 are all I-beams.

[0047] In this embodiment, the first adjustment frame 14 is surrounded by a first section steel 3, a second section steel 4, a third section steel 5, and a fourth section steel 6. Two first adjustment bolts 11 are respectively provided on the first section steel 3 of the first adjustment frame 14 along the front and rear directions, and two first adjustment bolts 11 are provided at positions of the second section steel 4 corresponding to the first adjustment bolts 11 on the first section steel 3. The first adjustment bolts 11 on the first section steel 3 and the first adjustment bolts 11 on the second section steel 4 are both extended in the left and right directions; a first adjustment bolt 11 is provided on the third section steel 5 of the first adjustment frame 14, and a first adjustment bolt 11 is provided on the fourth section steel 6 of the first adjustment frame 14, and the first adjustment bolt 11 on the third section steel 5 and the first adjustment bolt 11 on the fourth section steel 6 are oppositely arranged and both extend in the front and rear directions.

[0048] The first adjusting bolt 11 on the front side of the first section steel 3, the first adjusting bolt 11 on the front side of the second section steel 4, and the first adjusting bolt 11 on the third section steel 5 are used to adjust the verticality of one of the steel pipes in the double steel pipe column 27; the first adjusting bolt 11 on the rear side of the first section steel 3, the first adjusting bolt 11 on the rear side of the second section steel 4, and the first adjusting bolt 11 on the fourth section steel 6 are used to adjust the verticality of the other steel pipe in the double steel pipe column 27.

[0049] The first connecting rod 7, the first steel section 3, the second steel section 4, and the third steel section 5 form a positioning frame 15; the second connecting rod 8, the first steel section 3, the second steel section 4, and the fourth steel section 6 form a positioning frame 15; the third connecting rod 9, the first steel section 3, the third steel section 5, and the fourth steel section 6 form a positioning frame 15; the fourth connecting rod 10, the second steel section 4, the third steel section 5, and the fourth steel section 6 form a positioning frame 15; two second adjusting bolts 12 extending in the up and down directions are respectively provided on the first connecting rod 7, the second connecting rod 8, the third connecting rod 9, and the fourth connecting rod 10 of the positioning frame 15, and the lower ends of the second adjusting bolts 12 are in pressure contact with the rectangular steel plate of the base 1 to adjust the flatness of the vertical disk by adjusting each second adjusting bolt 12.

[0050] The vertical adjustment frame 16 is detachably connected to the base 1, and the adjustment frame 18 includes a support leg 17 fixed on the base 1 and an adjustment frame 18 fixed on the top of the support leg 17. The adjustment frame 18 is a rectangular frame. The adjustment frame 18 includes a rectangular frame and a "well" structure support frame fixed inside the rectangular frame. The support frame is welded by a first support rod 19 and a second support rod 20 arranged in parallel and spaced apart in the left and right directions, and a third support rod 21 and a fourth support rod 22 arranged in parallel and spaced apart in the front and back directions. A second adjustment frame 23 corresponding to the first adjustment frame 14 is provided inside the adjustment frame 18. In this embodiment, the second adjustment frame 23 is a rectangular frame, and the second adjustment frame 23 is surrounded by the first support rod 19, the second support rod 20, the third support rod 21, and the fourth support rod 22. Two third adjusting bolts are arranged on the first support rod 19 at intervals along the front-to-back direction, two third adjusting bolts are arranged on the second support rod 20 at positions corresponding to the third adjusting bolts of the first support rod 19, one third adjusting bolt is arranged on the third support rod 21, and one third adjusting bolt is arranged on the fourth support rod 22 at a position corresponding to the third adjusting bolt on the third support rod 21; the third adjusting bolt on the first support rod 19 and the third adjusting bolt on the second support rod 20 are both extended in the left-right direction, and the third adjusting bolt on the third support rod 21 and the third adjusting bolt on the fourth support rod 22 are both extended in the front-to-back direction.

[0051] The third adjusting bolt on the front side of the first support rod 19, the third adjusting bolt on the third support rod 21, and the third adjusting bolt on the front side of the second support rod 20 are used to adjust the verticality of one of the double steel pipe columns 27. The third adjusting bolt on the rear side of the first support rod 19, the third adjusting bolt on the fourth support rod 22, and the third adjusting bolt on the rear side of the second support rod 20 are used to adjust the verticality of the other double steel pipe column 27.

[0052] In this embodiment, the legs 17 of the vertical adjustment frame 16 are detachably connected to the base 1 by bolts. In order to increase the structural strength of the vertical adjustment frame 16, in this embodiment, obliquely arranged reinforcing ribs 25 are fixed between the adjustment frame 18 and the legs 17 of the vertical adjustment frame 16. Two reinforcing ribs 25 are provided on each side of the vertical adjustment frame 16, and the two reinforcing ribs 25 are distributed in an "eight" shape.

[0053] In order to facilitate construction workers to climb onto the adjustment frame 18 of the vertical adjustment frame 16 to adjust the third adjustment bolt, in this embodiment, a ladder 26 is provided between the adjustment frame 18 and the base 1 .

[0054] The design of the vertical adjustment frame 16 must ensure 200mm of free movement clearance around the twin steel pipe columns 27 to ensure sufficient space for vertical adjustment. The height of the vertical adjustment frame 16 is controlled according to the depth of the steel pipes, with a height ratio of 1:10. The height of the vertical adjustment frame 16 should be kept below 4m to meet on-site concrete pouring and safety requirements.

[0055] The installation and use method of the "one pile, two columns" construction verticality adjustment device of the present invention for adjusting the verticality of the double steel pipe columns 27 includes the following steps:

[0056] Step 1: Drilling the pile foundation. An excavator is used to drill the pile foundation, creating a variable diameter pile hole that is larger at the top and smaller at the bottom. Before drilling the pile foundation, the center point of the pile hole is staked out according to the designed position. A rotary drilling rig is then used with a core drill to drill the pile hole. The casing is then installed. The casing is made of 20mm thick steel plate and should be installed 200mm above the ground.

[0057] When drilling the pile foundation, a rotary drilling machine drilling process is adopted. A 2000mm diameter drill bit is first used to drill the hole to the designed depth in one go, and then the hole is expanded in stages every 200mm (i.e. 2000mm→2200mm→2400mm→2600mm). When constructing in soil layers or rock layers with lower strength, cross-stage drilling can be carried out. After the rotary drilling machine completes the construction of the hole size of the reverse pile body, a 3000mm drill bit is used to expand the insertion section of the double steel pipe column 27 of the underground structure to form an ultra-large variable diameter pile hole with a larger top and a smaller bottom.

[0058] Mud is required to protect the wall during the drilling process. The mud density should be controlled at 1.1-1.3 according to the soil quality. After the drilling is completed, an ultrasonic hole detector is used to test the verticality of the pile hole, sediment thickness, and aperture. The steel cage can be hoisted only after meeting the requirements.

[0059] Step 2: Install the base 1; set the center of the base 1 coaxially with the center of the pile hole and then fix the base to the embedded bolts embedded in the ground to fix the base 1 on the ground.

[0060] Before installing the base 1, clean the debris and mud on the concrete around the casing after the hole detection is completed, and then install the base 1 on the concrete. The center of the base 1 is coaxial with the center of the casing and the center of the pile hole, and the deviation shall not exceed 10mm.

[0061] The installation of base 1 must meet the levelness requirements, and the height difference of each point of base 1 shall not exceed 5mm.

[0062] Step 3: Hoist the steel cage into the pile hole. The steel cage is hoisted in sections and the joints of two adjacent sections are welded together.

[0063] When hoisting the steel cage in sections, the length of each section of the steel cage is controlled according to the length of the main reinforcement of the steel cage. The joints are welded joints, the single-sided welding is not less than 10d, and the section joint rate is controlled below 50%. The net distance between adjacent main reinforcement welding points is not less than 500mm.

[0064] Step 4: Install the vertical adjustment plate 13 so that the direction of the vertical adjustment plate 13 is consistent with the design direction of the double steel pipe column 27; after the vertical adjustment plate 13 is placed, adjust the second adjusting bolt 12 on the positioning frame 15, check the flatness of the vertical adjustment plate 13 itself, and at the same time adjust the first adjusting bolt 11 on the vertical adjustment plate 13 to ensure that the first adjusting bolt 11 moves freely.

[0065] Step 5: Hoisting and positioning of the double steel pipe column 27; Use a crawler crane to synchronously lift the connected double steel pipe columns 27 from the special tire frame and keep them in an upright state. After ensuring safety, transfer them to the pile hole position so that the positioning direction of the double steel pipe columns 27 is consistent with the design direction in the drawing; when the double steel pipe columns 27 pass through the first adjustment frame 14 of the vertical adjustment plate 13, the hoisting process should be carried out slowly and controlled within 2m / min. During the hoisting process, personnel should be arranged to gently support the double steel pipe columns 27 to ensure that the double steel pipe columns 27 deviate within a smaller range to avoid the shear bolts on the outer wall of the double steel pipe columns 27 colliding with the steel cage.

[0066] After the double steel pipe column 27 is hoisted into place, it meets the elevation and position of the double steel pipe column 27. The elevation verification of the double steel pipe column 27 is mainly carried out through dual control of the elevation control line of the outer wall of the double steel pipe column 27 and the elevation of the cross steel plate in the center of the steel pipe column, ensuring that the elevation accuracy is controlled within the range of 5mm; the position verification of the double steel pipe column 27 is mainly carried out through dual control of the position control line engraved on the base 1 and the positioning coordinates of the center point of the double steel pipe column 27, ensuring that the position accuracy of the double steel pipe column 27 is controlled within the range of 5mm.

[0067] After the review is completed, 8 positioning columns are welded around the double steel pipe column 27 to support the double steel pipe column 27 on the vertical adjustment plate 13 through the positioning columns. The crawler crane hook can be released only after the positioning plate welding is completed and reaches a certain strength. Then, the laser inclinometer is turned on to dynamically observe the verticality of the double steel pipe column 27. When the verticality cannot meet the design requirement of ≤1 / 500, the verticality of the double steel pipe column 27 is initially adjusted by adjusting the first adjusting bolt 11 on the first adjusting frame 14 according to the X / Y axis deviation value displayed by the inclinometer until the X / Y axis deviation values of the double steel pipe column 27 meet the design requirements.

[0068] Step 6: Hoisting and installation of the vertical adjustment frame 16; after the double steel pipe column 27 is adjusted vertically in the vertical adjustment plate 13 to meet the design requirements, the vertical adjustment frame 16 is hoisted by a crawler crane. After the vertical adjustment frame 16 is positioned, it is fixedly connected to the base 1 by bolts. After the vertical adjustment frame 16 is installed, the upper end of the double steel pipe column 27 is located above the vertical adjustment frame 16. Adjust the third adjusting bolt on the second adjusting frame 23 to perform a secondary vertical adjustment of the verticality of the double steel pipe column 27. The secondary vertical adjustment accuracy can reach 1 / 1000, far exceeding the design accuracy requirement.

[0069] The present invention utilizes the aforementioned verticality adjustment device to adjust the verticality of the dual steel pipe columns 27, enabling the dual steel pipe columns 27 to be hoisted, lowered, and adjusted vertically as a whole, reducing a significant amount of repetitive work and simplifying operation. Furthermore, the verticality adjustment device of the present invention utilizes a first adjustment bolt 11 on a first adjustment frame 14 of a vertical adjustment plate 13 to perform a preliminary adjustment of the verticality of the dual steel pipe columns 27, achieving a verticality adjustment accuracy of 1 / 500. After the vertical adjustment frame 16 is installed, a second adjustment bolt 23 on an adjustment frame 18 of the vertical adjustment frame 16 is utilized to perform a secondary adjustment of the verticality of the dual steel pipe columns 27, achieving a secondary vertical adjustment accuracy of 1 / 1000, thereby fully ensuring that the verticality of the dual steel pipe columns 27 meets the design accuracy requirements.

[0070] In the above embodiment, the first adjustment frame and the second adjustment frame are both rectangular frames, the first adjustment frame is provided with six first adjustment bolts, and the second adjustment frame is provided with six third adjustment bolts; in other embodiments, the first adjustment frame and the second adjustment frame can also be similar to the external contour of the double steel pipe column.

[0071] In the above embodiment, an obliquely arranged reinforcing rib is fixed between the adjustment frame and the supporting legs; in other embodiments, the reinforcing rib may not be provided.

[0072] In the above embodiment, a ladder is provided between the adjustment frame and the base; in other embodiments, the ladder may not be provided.

[0073] In the above embodiment, in step 4, after the vertical adjustment plate is placed, the second adjusting bolt on the positioning frame is adjusted to check the flatness of the vertical adjustment plate itself, and at the same time, the first adjusting bolt on the vertical adjustment plate is tightened to ensure that the first adjusting bolt moves freely. In other embodiments, after checking the flatness of the vertical adjustment plate itself, it is not necessary to attempt to tighten the first adjusting bolt on the vertical adjustment plate.

[0074] In the above embodiment, in step five, when the double steel pipe columns pass through the first adjustment frame of the vertical adjustment plate, the hoisting process should be carried out slowly, and personnel need to be arranged to gently support the double steel pipe columns during the hoisting process to ensure that the double steel pipe columns are offset within a smaller range; in other embodiments, when a single or double steel pipe column passes through the first adjustment frame of the vertical adjustment plate, only the hoisting speed is slowed down, and there is no need to arrange personnel to gently support the double steel pipe columns.

[0075] In the above embodiment, the double steel pipe columns are connected by steel plates, and the steel plates are arranged at intervals in the axial direction of the steel pipe columns; in other embodiments, the double steel pipe columns can also be connected by connecting rods.

Claims

1. A method for using a verticality adjustment device for "one pile and two columns" construction, characterized by: include: Base: used to be fixed at the opening of the pile hole. The base is rectangular, and a avoidance hole corresponding to the pile hole is opened in the center of the base; Vertical adjustment plate: Placed on the base, the vertical adjustment plate is in the shape of a "well" and includes a first adjustment frame for the dual steel pipe columns to pass through and positioning frames fixed to each side of the first adjustment frame. The first adjustment frame is provided with a first adjustment bolt for adjusting the verticality of the dual steel pipe columns, and the positioning frame is provided with a second adjustment bolt for adjusting the flatness of the vertical adjustment plate. The first adjustment frame is provided corresponding to the avoidance hole. Vertical adjustment frame: includes a support leg fixed on the base and an adjustment frame fixed on the upper part of the support leg, the adjustment frame includes a second adjustment frame corresponding to the first adjustment frame above and below, and the second adjustment frame is provided with a third adjustment bolt for adjusting the verticality of the double steel pipe column; Step 1: Pile foundation drilling, using a rotary drilling machine to form a variable diameter pile hole with a larger top and a smaller bottom; Step 2: Install the base; make the center of the base coaxial with the center of the pile hole and then fix the base to the ground; Step 3: Hoist the steel cage into the pile hole; hoist the steel cage in sections and weld the joints of two adjacent sections of the steel cage together; Step 4: Install the vertical adjustment plate; make the direction of the vertical adjustment plate consistent with the design direction of the double steel pipe column; Step 5: Hoist and position the double steel pipe columns; use the crawler crane hook to hoist the double steel pipe columns so that the positioning direction of the double steel pipe columns is consistent with the design direction on the drawing; After the double steel pipe columns are hoisted into place, their elevation and position are checked. After the check is complete, positioning columns are welded around the double steel pipe columns to support them on the vertical adjustment plate. The crawler crane hook is then released. A laser inclinometer is then used to dynamically monitor the verticality of the double steel pipe columns. Preliminary verticality adjustments are made by adjusting the first adjusting bolt on the first adjusting frame. Step 6: Install the vertical adjustment frame. After the double steel pipe columns are adjusted to the design requirements in the vertical adjustment plate, use a crawler crane to install the vertical adjustment frame. After the vertical adjustment frame is positioned, it is fixedly connected to the base. After the vertical adjustment frame is installed, the upper ends of the double steel pipe columns are located above the vertical adjustment frame. Adjust the third adjusting bolt on the second adjusting frame to perform a secondary vertical adjustment of the double steel pipe columns. In step 5, when the double steel pipe columns pass through the first adjustment frame of the vertical adjustment plate, the hoisting process should be carried out slowly. During the hoisting process, personnel should gently support the double steel pipe columns to ensure that the double steel pipe columns deflect within a small range. The double steel pipe columns are connected by steel plates, which are arranged at intervals in the axial direction of the steel pipe columns; each steel pipe column is welded with bolts arranged in rows in the circumference; In step 4, after the vertical adjustment plate is placed, the second adjusting bolt on the positioning frame is adjusted to check the flatness of the vertical adjustment plate itself. At the same time, the first adjusting bolt on the vertical adjustment plate is tightened to ensure that the first adjusting bolt moves freely.

2. The method for using the verticality adjustment device for "one pile and two columns" construction according to claim 1 is characterized in that: The first adjustment frame and the second adjustment frame are both rectangular frames. The first adjustment frame is provided with six first adjustment bolts, and the second adjustment frame is provided with six third adjustment bolts.

3. The method for using the verticality adjustment device for "one pile and two columns" construction according to claim 1 or 2, characterized in that: An obliquely arranged reinforcement rib is fixed between the adjustment frame and the supporting legs.

4. The method for using the verticality adjustment device for "one pile and two columns" construction according to claim 1 or 2, characterized in that: A ladder is provided between the adjustment frame and the base.

5. The method for using the verticality adjustment device for "one pile and two columns" construction according to claim 1 is characterized in that: In step five, the elevation of the double steel pipe column is double-controlled by the elevation control line of the outer wall of the double steel pipe column and the elevation of the cross steel plate in the center of the steel pipe column; the position of the double steel pipe column is double-controlled by the position control line engraved on the base and the positioning coordinates of the center point of the double steel pipe column.

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