Clamping and fixing device for butt joint of large-diameter steel pipe piles and segmented installation method of large-diameter steel pipe piles

Abstract

The invention relates to a clamping and fixing device for butt joint of large-diameter steel pipe piles and a segmented installation method of the large-diameter steel pipe piles. The clamping and fixing device is provided with a base, the base is provided with an installation hole, and at least three positioning components and at least three clamping and fixing components are arranged on the edge of the installation hole and are rotationally and symmetrically distributed with the circle center of the installation hole as a fixed point. According to the segmented installation method for the large-diameter steel pipe pile, when a previous steel pipe is downwards hoisted to a pile foundation hole opening, the steel pipe is fixed through the clamping and fixing device, then a next steel pipe is hoisted for butt welding, the next steel pipe is downwards lowered after welding, and all the steel pipes are welded in this way; and the upper end part of the last section of the steel pipe is radially positioned by using a clamping device, so that the steel pipe is positioned at the designed position in the radial direction. And then a sounding pipe and an auxiliary reinforcement cage are hoisted, and pile foundation guide pipe method pouring is carried out. By means of the device and the construction and installation method, accurate center alignment of the steel pipes is achieved, the segmented butt joint precision of the steel pipes is further improved, construction is convenient, and cost is saved.

Description

Technical Field

[0001] The invention provides a facility and a method for building construction, in particular to a clamping device for butting large-diameter steel pipe piles and a segmented installation method for large-diameter steel pipe piles. Background Art

[0002] Pile foundation is the foundation of a building. Steel pipe cast-in-place pile is a new type of pile foundation structure. During construction, the pile hole is first dug according to the design, and then the steel pipe is lowered into the pile hole, and then the auxiliary steel cage is lowered into the steel pipe, and concrete is poured to form the pile foundation.

[0003] Due to the advantages of strong bearing capacity, high degree of mechanized construction and material saving, cast-in-place steel pipe piles are widely used in water conservancy and hydropower reserved rock cofferdam reinforcement, slope protection, port and shipping terminal reinforcement, slope reinforcement and civil building foundation reinforcement.

[0004] Among them, in the construction of highway bridge and culvert foundation reinforcement and other fields, steel pipe piles with a diameter of more than 1.5m and a wall thickness of more than 20mm (i.e. large-diameter steel pipe piles) have been greatly promoted and applied.

[0005] However, due to the limitations of external transportation conditions, large-diameter steel pipes are manufactured and transported in sections and then welded and butted together during on-site construction and installation.

[0006] During on-site construction and installation, the sections of large-diameter steel pipes are horizontally connected and then lifted vertically into the pile holes. This construction method requires the use of heavy lifting equipment, has high construction costs and high lifting risks, and is not an ideal installation method.

[0007] Another on-site construction and installation method is to install in sections, and then vertically connect the sections at the entrance of the pile foundation and then insert them into the pile hole. Sectional lifting can reduce the requirements for lifting equipment. However, it is difficult to ensure the docking accuracy when connecting sections, and it is difficult to stabilize the docked steel pipe at the entrance of the pile foundation during docking. For this reason, a common method is to set a steel stretcher at the entrance of the pile hole and use the stretcher to fix the vertical steel pipe. However, when this method is used, the sectioned docking of the steel pipe is prone to deviation (the upper and lower sections are not aligned with the center), and the poor groove accuracy of the welding at the docking is not conducive to welding; and the steel pipe is not easy to find the center, and the distance between the outer wall of the steel pipe and the inner wall of the pile hole is difficult to control, which restricts the construction quality of the sectioned lifting of the steel pipe pile.

[0008] Therefore, it is necessary to design a device or construction method that is conducive to improving the construction quality of steel pipe pile segmented lifting and reducing the construction cost during segmented lifting. Summary of the invention

[0009] In order to solve the above technical problems, the present invention provides a fastening device for butt-jointing large-diameter steel pipe piles and a segmented installation method for large-diameter steel pipe piles.

[0010] Among them, the clamping device for docking large-diameter steel pipe piles provided by the present invention is arranged at the pile foundation mouth and has a base. The base has an installation hole that passes through from top to bottom. The installation hole has the same outer contour as the steel pipe to be installed and its diameter is larger than the outer diameter of the steel pipe to be installed.

[0011] At least three positioning components and at least three fixing components are arranged at the edge of the installation hole and are rotationally symmetrically distributed with the center of the installation hole as a fixed point.

[0012] Among them, each positioning component has a positioning card plate that can extend and retract toward the center of the mounting hole, which is used for radial positioning of the steel pipe; the end of the positioning card plate facing the center of the mounting hole is the front end of the positioning card plate. After the positioning card plate is fully extended, the front end of the positioning card plate is tangent to a virtual circle whose diameter is smaller than the diameter of the steel pipe; after the positioning card plate is fully retracted, the front end of the positioning card plate is tangent to a virtual circle whose diameter is larger than the diameter of the steel pipe.

[0013] Among them, each fixing component has a movable tongue that can extend and retract toward the center of the mounting hole, and the front end of the movable tongue is used to provide friction to the outer wall of the steel pipe, and make the sum of the friction provided by all the movable tongues greater than the gravity of the steel pipe; the end of the movable tongue facing the center of the mounting hole is the front end of the movable tongue, and after the movable tongue is fully extended, the front end of the movable tongue is tangent to a virtual circle with a diameter smaller than the diameter of the steel pipe; after the movable tongue is fully retracted, the front end of the movable tongue is tangent to a virtual circle with a diameter greater than the diameter of the steel pipe.

[0014] The center of each virtual circle coincides with the center of the mounting hole.

[0015] For example, the fixing device for connecting large-diameter steel pipe piles has four positioning members and four fixing members, and the positioning members and the fixing members are crossed and equidistantly distributed around the installation hole.

[0016] For example, in the above-mentioned clamping device for docking large-diameter steel pipe piles, a plurality of auxiliary reinforcement blocks are arranged at the edge of the installation hole and are rotationally symmetrically distributed with the center of the installation hole as a fixed point.

[0017] The auxiliary reinforcement block is fixed to the steel pipe by welding to the outer wall of the steel pipe; a part of the auxiliary reinforcement block is located on the seat.

[0018] The auxiliary reinforcement blocks, the positioning components and the clamping components are cross-distributed around the installation holes.

[0019] As in the above-mentioned clamping device for docking large-diameter steel pipe piles, the base includes beams distributed around the pile foundation opening, the beams are connected to each other at the ends to form a square, and the beams are I-beams.

[0020] A fixing member is arranged on the virtual line between the midpoint of each beam and the center of the mounting hole.

[0021] A bottom plate is arranged between the cross beam and the pile foundation opening. The bottom plate is arranged horizontally, a mounting hole is provided in the center, and the edges around the bottom plate are fixed on the cross beam.

[0022] Positioning members are arranged on the bottom plate at the diagonal lines of the square.

[0023] As mentioned above, the fixing device for docking large-diameter steel pipe piles, wherein the positioning component has a pair of parallel vertical plates fixed on the base, a positioning clamping plate is arranged in the gap formed between the two vertical plates, and the axial center line of the positioning clamping plate coincides with the ray passing through the center of the installation hole.

[0024] The two vertical plates are oppositely provided with strip holes, the lower end of the strip hole is inclined toward the center of the installation hole, and the upper end of the strip hole is inclined away from the center of the installation hole, and the inclination angle is: forming an angle of 10°-45° with the plumb line.

[0025] Pin shafts are arranged on both sides of the positioning clamping plate, and the pin shafts penetrate into the strip holes and are clearance-matched with the strip holes.

[0026] At least when the pin shaft slides to the lower end of the strip hole, the front end of the positioning clamp plate is tangent to a virtual circle whose diameter is smaller than the diameter of the steel pipe; when the pin shaft slides to the upper end of the strip hole and has not reached the notch, the front end of the positioning clamp plate is tangent to a virtual circle whose diameter is larger than the diameter of the steel pipe.

[0027] For example, in the above-mentioned fastening device for docking large-diameter steel pipe piles, a notch for accommodating a pin shaft is provided at the upper end of the strip hole, close to the side away from the center of the installation hole.

[0028] A handle extending out of the slit and used for moving the positioning card plate is arranged on the upper end of the positioning card plate.

[0029] As in the above-mentioned fixing device for docking large-diameter steel pipe piles, the fixing member has a hinge seat arranged on a base; has a movable tongue; and the rear end of the movable tongue is hinged to the hinge seat.

[0030] The front end of the movable tongue is an arc-shaped edge. The movable tongue rotates with the hinge seat as the center until the front end points to the center direction of the mounting hole and forms any angle of 10°-30° with the horizontal plane. The arc-shaped edge can be tangent to the plumb line.

[0031] The curved edges have a pattern that increases friction.

[0032] A support column is arranged on the base, a telescopic rod is arranged on the support column, one end of the telescopic rod is hinged to the support column, and the other end is hinged to the front end of the movable latch tongue.

[0033] The large-diameter steel pipe pile segmented installation method provided by the present invention comprises the following steps: Step 1: Arrange the fastening device for docking the large-diameter steel pipe piles according to claim 1 at the opening of the pile foundation, and correct the positioning so that the center of the installation hole is aligned with the center of the pile foundation hole; Step 2: Lift the steel pipe in sections, pass the first section of the steel pipe through the installation hole and hang it down into the pile foundation hole, the upper end of the steel pipe is exposed above the installation hole, and stop hanging; Step 3: Use positioning components to radially position the steel pipe; Step 4: Use the clamping member to contact and clamp the outer wall of the steel pipe to fix the steel pipe in the axial direction; Step 5: Weld the auxiliary reinforcement blocks around the steel pipe; after welding, loosen the positioning components and the clamping components, and the steel pipe slides down due to gravity until the auxiliary reinforcement blocks contact the base; Step 6: Use the positioning component to locate the center of the steel pipe; use the clamping component to contact and clamp the outer wall of the steel pipe; Step 7: Weld the auxiliary clamping plate at the upper end of the steel pipe 50cm away from the port; after welding, hoist the second section of the steel pipe, butt the upper and lower sections of the steel pipe and align them before welding; after welding, disconnect the welding of the auxiliary reinforcement block and the steel pipe, loosen the positioning component and the clamping component, lower the first section of the steel pipe and the second section of the steel pipe into the pile hole; and make the upper end of the second section of the steel pipe partially exposed above the installation hole, and stop hanging; Step 8: Repeat steps 3-7 until all sections of steel pipes are lowered; Step 9: After the steel pipe is lowered, the upper end of the last section of the steel pipe is radially positioned by using a positioning member so that the steel pipe is in the designed position in the radial direction; the clamping member is contacted and clamped with the outer wall of the steel pipe to fix the steel pipe in the axial direction; Then hoist the sonic detection pipe and auxiliary steel cage, and perform the pile foundation conduit method of pouring; Step 10: After the pile foundation conduit method is used to pour the concrete until it begins to set, the fastening device for the large-diameter steel pipe piles can be removed.

[0034] As in the above-mentioned segmented installation method of large-diameter steel pipe piles, wherein the center of the steel pipe is positioned using a positioning component, specifically: the pin shafts on both sides of the positioning clamp are respectively slid down toward the lower end of the strip hole, and the front end of the positioning clamp is extended, and the depth of the pin shafts on both sides of each positioning clamp sliding down toward the lower end of the strip hole is different, resulting in different lengths of the front end of the positioning clamp extending, so as to achieve different pushing distances on the outer wall of the steel pipe, so that the steel pipe is in the designed position in the radial direction.

[0035] As in the above-mentioned segmented installation method of large-diameter steel pipe piles, wherein the use of a clamping member to contact and clamp the steel pipe is specifically as follows: starting the telescopic rod, pushing the movable clamping tongue and rotating it around the hinge seat, so that the front end of the movable clamping tongue is pressed against the steel pipe wall, increasing the friction between the front end of the movable clamping tongue and the steel pipe wall, and offsetting the gravity of the steel pipe.

[0036] Beneficial technical effects: The device and construction and installation method of the present invention, for large-diameter deep-hole steel pipe piles, adopts the technology of fixed segmented lifting and docking at the pile foundation hole and entering the hole segment by segment, so as to realize accurate center alignment of the steel pipe, further improve the docking accuracy of the steel pipe segments, facilitate docking welding, improve the center accuracy of the steel pipe installation, accurately control the distance between the steel pipe and the pile hole wall, ensure the size of the steel pipe protective layer constructed in the gap between the steel pipe and the pile hole wall, improve the overall construction quality of the steel pipe pile, give full play to the comprehensive efficiency of the steel pipe pile, improve the reinforcement effect, facilitate construction, and save costs.

[0037] The device has a simple structure, a high degree of standardization, and is easy to manufacture. The device can effectively improve the construction efficiency of segmented lifting of steel pipes in large-diameter steel pipe pile holes, reduce the use of large-scale heavy lifting equipment, and has good economy.

[0038] The device is recyclable, simple to manufacture, quick and convenient to assemble, simple and flexible to operate, highly practical, and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the device structure of the present invention; Figure 2 It is a schematic diagram of the structure of the positioning component of the present invention; Figure 3 The present invention is a positioning component structure, which mainly shows the structural relationship among the strip hole, the notch, the pin shaft and the vertical plate.

[0040] Figure 4 The present invention is a positioning component structure, which mainly shows the structural relationship among the positioning clamp, the handle and the vertical plate.

[0041] Figure 5 It is a schematic diagram of the structure of the fixing component of the present invention.

[0042] Reference numerals: Crossbeam 1; bottom plate 2; fixing member 3; mounting hole 4; auxiliary reinforcement block 5; steel pipe 6; positioning member 7; positioning clamping plate 8; pin shaft 9; strip hole 10; vertical plate 12; notch 11; handle 13; hinge seat 14; movable tongue 15; telescopic rod 16; support column 17; front end surface of movable tongue 18; hinge pin 19. DETAILED DESCRIPTION

[0043] In the construction of highway bridge and culvert foundation reinforcement and other fields, the steel pipe used in large-diameter steel pipe piles has a diameter of 1.5m or more, a wall thickness of 20mm or more, and a length of 10m; for a steel pipe pile with a diameter of 1.5 meters (i.e. 1500mm), its weight = cross-sectional area × length × density weight = cross-sectional area × length × density. If the thickness is 20mm and the length is 10m, the weight is about 7330kg.

[0044] In this example, virtual circles are used for description in many places. The virtual circles used in each example are all centered at the center of the mounting hole (the centers coincide with each other). Among them, the virtual circles with diameters larger than the diameter of the steel pipe may or may not be the same circle; the virtual circles with diameters smaller than the diameter of the steel pipe may or may not be the same circle.

[0045] The clamping device for connecting large-diameter steel pipe piles is arranged at the opening of the pile foundation and comprises a base, a positioning member 7, a clamping member 3, and an auxiliary reinforcement block 5.

[0046] Specifically, at least three positioning components, at least three fixing components, and a plurality of auxiliary reinforcement blocks are provided. These components are rotationally symmetrically distributed around the mounting hole with the center of the mounting hole as a fixed point, and the components are cross-distributed with each other.

[0047] The preferred example is, Figure 1 , with four positioning members 7 and four fixing members 3, and four auxiliary reinforcement blocks 5. Among them, the positioning members and the fixing members are crossed and equidistantly distributed around the mounting hole 4.

[0048] Example 1: Wherein, the base of the present invention: refer to Figure 1 , including beams 1 distributed around the pile foundation opening, the beams 1 are connected end to end to form a square. Of course, the beams can also be rectangular or circular, but the pile foundation hole itself is circular, so a square is the most appropriate. The beam 1 is an I-beam (or H-beam). In this example, it is made of H-beam with a specification of 200×200×8×12 (height×width×web thickness×flange thickness).

[0049] A bottom plate 2 is arranged between the cross beam 1 and the pile opening. The bottom plate is arranged horizontally, and the edges are fixed on the cross beam 1. The bottom plate 2 is made of a steel plate with a thickness of 20 mm. A mounting hole 4 is opened in the center of the bottom plate, and the mounting hole 4 has the same outer contour as the steel pipe 6 to be installed. For example, if the installed steel pipe is a square pipe, then the mounting hole opened should also be a square hole, or if the installed steel pipe is a special-shaped pipe, then the mounting hole opened should also be a special-shaped hole. However, in common construction, round pipes are installed, so this example uses round pipe piles as an example, and the mounting hole is also a round hole. The diameter of the mounting hole is larger than the outer diameter of the steel pipe to be installed (the radius of the mounting hole R = the diameter of the steel pipe to be installed r + 5cm).

[0050] One example is that the edge of the mounting hole 4 of the present invention is basically tangent to the inner edge of the beam 1, which is equivalent to the bottom plate occupying only a very small area. This structure makes the overall weight of the device small and occupies a small area. In this example, the fixing member 3 is welded to the midpoint of each beam, and the positioning member 7 is welded to the bottom plate on the diagonal of the square.

[0051] Another example is that there is a large space between the crossbeam 1 and the mounting hole 4, that is, the crossbeam forms a square, which is much larger than the area of ​​the mounting hole, so a larger mounting plate is required; this structure makes the overall weight of the device large and occupies a large area, but the contact area with the ground is large and more stable. In this example, the fixing components and positioning components are welded to the bottom plate instead of the crossbeam (because the crossbeam is too far away from the mounting hole).

[0052] In this example, the bottom plate 2 and the cross beam 1 are formed by welding. The H-shaped steel of the cross beam 1 is two flanges distributed up and down. The flanges are placed horizontally, and the web is placed vertically. The bottom plate 2 is welded to the flanges that are grounded below. When the cross beam 1, bottom plate 2, clamping member 3, and positioning member 7 are welded and assembled, the weld height is required to be not less than 10mm and the weld width is not less than 8mm. The function of the base is to form a large-diameter pile mouth working platform and foundation platform. It is necessary to weld hoisting holes on the base.

[0053] Among them, the positioning member 7 of the present invention: refer to Figure 2-Figure 4 The positioning member 7 of the present invention is welded to the base plate, and is preferably located on the diagonal of the square formed by the crossbeam. The positioning member 7 mainly bears the radial force of the steel pipe, which is smaller than the axial gravity of the steel pipe borne by the fixing member. Therefore, the positioning member 7 is arranged at the relatively weak structure of the crossbeam connection.

[0054] The positioning member 7 has a pair of parallel vertical plates 12 fixed on the base. The vertical plates 12 are made of Q235 steel plates with a height of 250 mm, a length of 250 mm, and a thickness of 20 mm. In order to increase the strength of the vertical plates, the rear ends of the two vertical plates can be welded together with another vertical plate. The lower edge of the vertical plate 12 is welded to the base, and one example is welded to the bottom plate 2.

[0055] A 44mm wide gap is formed between the two vertical plates, and a positioning card plate 8 is arranged in the gap, and the positioning card plate 8 is arranged parallel to the two vertical plates 12; the axis line of the positioning card plate coincides with the ray passing through the center of the mounting hole 4, that is, the positioning card plate 8 points to the center of the mounting hole, and the end of the positioning card plate facing the center of the mounting hole is the front end of the positioning card plate. The positioning card plate can extend and retract toward the center of the mounting hole, and is used to radially position the steel pipe 6.

[0056] In this example, the positioning card plate 8 is made of Q235 steel plate, with a length of 200mm, a height of 120mm, and a thickness of 40mm. In order to make the front end of the positioning card plate fit better with the outer surface of the steel pipe, the front end of the positioning card plate can be ground into an inner concave arc shape adapted to the outer surface of the steel pipe.

[0057] Strip holes 10 are arranged opposite to each other on the two vertical plates. The strip holes are arranged obliquely, with the lower end of the strip hole inclined toward the center of the mounting hole, and the upper end of the strip hole inclined away from the center of the mounting hole. The inclination angle is: 20°-40° with the plumb line, preferably 30°; the length of the strip hole 10 is greater than 200mm.

[0058] Pins 9 are provided on both sides of the positioning card plate. The pins 9 are inserted into the strip holes 10 and are clearance-matched with the strip holes (so that the pins can slide smoothly in the strip holes and the clearance is not too large). In one example, an M20 bolt is used as the pin 9, and nuts are used as retaining rings at both ends; in another example, two M20 bolts are used as the pin 9, and nuts are used as retaining rings at both ends of the bolts; the center distance between the two bolts is 60mm-70mm. The two pins are more conducive to sharing the shear force on the bolts, increasing the friction of the bolts in the strip holes, and stabilizing the state of the positioning card plate 8.

[0059] When the pin 9 slides to the lower end of the strip hole 10, the front end of the positioning card 8 will extend forward and be tangent to a virtual circle with a diameter smaller than the diameter of the steel pipe, which ensures that when the positioning card extends forward, it can smoothly and effectively contact the outer wall of the steel pipe and generate a certain radial thrust on the steel pipe 6; when the pin slides to the upper end of the strip hole and does not reach the notch, the front end of the positioning card shrinks backward and is tangent to a virtual circle with a diameter larger than the diameter of the steel pipe, which ensures that when the positioning card shrinks backward, it can cut off contact with the outer wall of the steel pipe. The stroke of the positioning card extending forward and shrinking backward is related to the length and inclination angle of the strip hole. When the positioning card plate contacts the outer wall of the steel pipe and generates radial thrust on the steel pipe, it is also related to the inclination angle of the strip hole. If the inclination angle is smaller (approaching vertical), the thrust that can be borne is greater, and the friction of the bolt in the strip hole is greater, but the travel of the positioning card plate in the front and rear directions is smaller; and if the inclination angle is larger (approaching horizontal), the thrust that can be borne is smaller (when it exceeds 40°, it can hardly bear the thrust), and the friction of the bolt in the strip hole is smaller, but the travel of the positioning card plate in the front and rear directions is larger. Under comprehensive design, the strip hole 10 is set to form an angle of 30° with the plumb line, and the length of the strip hole is 220mm.

[0060] When the front end of the positioning clamp plate is effectively in contact with the outer wall of the steel pipe, the downward sliding motion of the steel pipe under the influence of gravity is transmitted to the positioning clamp plate 8, causing the positioning clamp plate to move downward. Through the cooperation of the pin shaft 9 and the strip hole 10, the positioning clamp plate will increase the clamping force on the outer wall of the steel pipe. On the one hand, it can better form a thrust on the outer wall of the steel pipe. After the thrusts of the positioning clamp plate in four directions are balanced, the steel pipe can be radially positioned; on the other hand, it can clamp the steel pipe to offset a small part of the downward gravity of the steel pipe.

[0061] A notch 11 for accommodating the pin is provided at the upper end of the strip hole, away from the center of the mounting hole. When the pin slides to the uppermost end of the strip hole, the pin can be directly placed in the notch 11 to prevent it from sliding into the lower end of the strip hole again due to the gravity of the positioning plate.

[0062] A handle 13 is provided on the upper end of the positioning card plate 9, and the handle needs to extend out of the gap for easy operation. The handle is used to toggle the positioning card plate, and the handle is made of Φ20mm round steel.

[0063] Among them, the fixing member 3 of the present invention: refer to Figure 1 A fixing component 3 is arranged on the virtual line between the midpoint of each crossbeam 1 and the center of the mounting hole, and the hinge seat 14 and the support column 17 of the fixing component can be welded to the crossbeam or the bottom plate.

[0064] refer to Figure 5 The fixing member 3 includes a hinge seat 14 and a movable tongue 15. The hinge seat 14 is arranged on the base, and the rear end of the movable tongue 15 is hinged to the hinge seat. The structure of the hinge seat 14 can be similar to the vertical plate of the positioning member, and a gap is formed between two steel plates welded to the bottom plate. The movable tongue 15 is arranged in the gap. The movable tongue is a Q235 steel plate with a thickness of 40mm, a length of 250mm and a height of 100mm. A hinge pin 19 is used to pass through the hinge seat and the movable tongue respectively. The steel plate of the hinge seat adopts a 20mm thick steel plate, a height of 200mm and a width of 200mm; the hinge pin 19 adopts an M30 bolt.

[0065] The optimal design of the front end of the movable tongue 15: 1. The front end of the movable tongue is an outwardly convex arc edge, which means that there is an arc transition between the upper edge and the lower edge of the front end face 18 of the movable tongue. Therefore, when the movable tongue rotates with the hinge seat as the center of the circle until the front end points to the center direction of the mounting hole and forms any angle of 10°-30° with the horizontal plane, the arc edge can be tangent to the plumb line, which makes the front end face 18 of the movable tongue effectively contact the outer wall of the steel pipe when the outer wall of the steel pipe approaches or moves away from the front end of the movable tongue (approaching or moving away within a range); and when the movable tongue is rotated to form one of the angles of 10°-30° with the horizontal plane, the arc edge should be tangent to the outer wall of the steel pipe (this requirement is mainly controlled by the length of the movable tongue). This ensures that the front end face 18 of the movable tongue can smoothly and effectively contact the outer wall of the steel pipe, and is tightly attached to the outer wall of the steel pipe, generating huge friction. The sum of the friction provided by all the active tongues is greater than the weight of the steel pipe 6, which is used to offset the weight of the steel pipe. 2. The left and right edges of the front end face 18 of the active tongue are in an inwardly concave arc shape adapted to the outer surface of the steel pipe, which can better fit the outer surface of the steel pipe and increase the friction. 3. The front end face 18 of the active tongue has a pattern that increases friction, preferably horizontal stripes or saw teeth.

[0066] The movable tongue 15 takes the hinge seat 14 as the center of the circle. When it rotates backward, the movable tongue is equivalent to shrinking backward and will be tangent to a virtual circle whose diameter is larger than the diameter of the steel pipe. This ensures that the movable tongue can cut off the contact with the outer wall of the steel pipe when shrinking backward.

[0067] A support column 17 is welded on the base. The support column 17 is an H-shaped steel with a specification of 200×200×8×12. The support column is located behind the hinge seat (the rear is far away from the center direction of the installation hole). A telescopic rod 16 is set on the support column. The telescopic rod is a 10t micro jack. One end of the telescopic rod 16 is hinged to the upper end of the support column, and the other end is hinged to the front end of the movable tongue. The rotation of the movable tongue is driven by the telescopic rod. When working, the telescopic rod pushes the front end of the movable tongue to close to the wall of the steel pipe, generating a huge friction force. The four clamping components clamp the steel pipe, overcome the gravity of the steel pipe, and keep the steel pipe stationary in the axial direction. At the same time, they also cooperate with the positioning card plate to position the steel pipe radially. Of course, in order to ensure multiple safety, in actual work, when the crane hoists the steel pipe, although the clamping components and the positioning card plate lock the steel pipe, the steel pipe is not removed from the crane, and the crane still keeps lifting the steel pipe.

[0068] Among them, the auxiliary reinforcement block 5 of the present invention: refer to Figure 1 Four or six auxiliary reinforcement blocks 5 are arranged at the edge of the mounting hole, and are rotationally symmetrically distributed with the center of the mounting hole as a fixed point. The auxiliary reinforcement block 5 and the positioning member 7 and the fixing member 3 are crossed and equidistantly distributed around the mounting hole 4. The auxiliary reinforcement block is used to be fixed to the steel pipe by welding to the outer wall of the steel pipe. A part of the auxiliary reinforcement block is on the seat, and it can be directly supported on the base without connection or welding, or the auxiliary reinforcement block can be fixed to the base by welding. The auxiliary reinforcement block 5 is a Q235 steel plate with a thickness of 20 mm, a length of 250 mm and a height of 100 mm.

[0069] Example 2: The steps for installing large diameter steel pipe piles in sections are as follows: Step 1: Set the fastening device for connecting the large-diameter steel pipe pile at the opening of the pile foundation, and calibrate the positioning so that the center of the installation hole is aligned with the center of the pile foundation hole.

[0070] Step 2: Lift the steel pipe 6 in sections, pass the first section of the steel pipe through the installation hole and hang it down into the pile foundation hole, with the upper end of the steel pipe exposed above the installation hole. After the exposed length is about 1m, stop hanging; Step 3: Tighten the positioning member 7 to position the steel pipe 6 radially; specifically, slide the pins 9 on both sides of the positioning card plate 8 toward the lower end of the strip hole 10, and extend the front end of the positioning card plate to effectively contact the outer wall of the steel pipe.

[0071] Step 4: Use the clamping member 3 to contact and clamp the outer wall of the steel pipe to fix the steel pipe 6 in the axial direction. Specifically, start the telescopic rod 16, push the movable tongue 15 and rotate it around the hinge seat, so that the front end of the movable tongue is pressed against the steel pipe wall, increase the friction between the front end of the movable tongue and the steel pipe wall, and offset the gravity of the steel pipe.

[0072] Step 5: Weld the auxiliary reinforcement block 5 around the steel pipe, 50 cm below the pipe mouth of the steel pipe; after welding, loosen the positioning member 7 and the clamping member 3, and the steel pipe 6 slides down under the cooperation of the crane, until the lower edge of the auxiliary reinforcement block 5 is supported on the base and then stops. At this time, the upper end of the steel pipe is about 50 cm away from the port.

[0073] Step 6: radially position and axially fix the steel pipe again, specifically: use the positioning member to position the center of the steel pipe so that the steel pipe is in the designed position in the radial direction (specifically, the distance from the inner wall of the pile hole in all directions of the outer wall of the steel pipe is equal, which is 5 cm). The pins on both sides of the positioning card plate slide down to the lower end of the strip hole respectively, and the front end of the positioning card plate 8 extends out, and the depth of the pins on both sides of each positioning card plate sliding down to the lower end of the strip hole is different, so that the front end of the positioning card plate extends out to different lengths, so as to achieve different pushing distances on the outer wall of the steel pipe, so that the steel pipe is in the designed position in the radial direction.

[0074] As shown in step 4, the clamping member is used to contact and clamp the outer wall of the steel pipe, so that the steel pipe is fixed in the axial direction.

[0075] Step 7: Weld the auxiliary clamping plate at the upper end of the steel pipe 50cm away from the port; after welding, hoist the second section of the steel pipe, butt the upper and lower sections of the steel pipe and align them before welding; welding is carried out by two people in the same direction and uniform welding, and the non-destructive testing of the butt weld of the steel pipe is qualified. After welding, melt the welding between the auxiliary reinforcement block 5 and the steel pipe 6, loosen the positioning component 7, and then loosen the clamping component 3, lower the first section of the steel pipe and the second section of the steel pipe into the pile hole; and stop hanging when the upper end of the second section of the steel pipe is exposed 1m above the installation hole.

[0076] The auxiliary alignment plates here specifically refer to: 3-6 plates (preferably 4 plates) are welded outside the upper pipe opening of the first section of steel pipe and are roughly equidistantly distributed on the circumference of the pipe opening, the lower end of the plates is welded to the outer wall of the upper pipe opening of the steel pipe, and the upper end of the plates extends above the pipe opening. When the second section of steel pipe is hoisted, the lower end of the second section of steel pipe is directly inserted into the enclosure formed by these plates, so that the pipe opening of the first section of steel pipe can be aligned with the pipe opening of the second section of steel pipe.

[0077] Step 8: Repeat steps 3-7 until all the steel pipes are lowered; Step 9: After all the steel pipes are lowered, tighten the positioning member 7 and the fixing member 3, and radially position the upper end of the last section of the steel pipe so that the steel pipe is in the designed position in the radial direction (refer to step 6 for the specific process method); then hoist the sonic detection pipe and the auxiliary steel cage, and perform the pile foundation conduit method pouring to prevent the steel pipe from floating and deflecting during the hoisting of the sonic detection pipe and the auxiliary steel cage and the pile foundation conduit method pouring.

[0078] Step 10: After the pile foundation conduit method is used to pour the concrete until it begins to set, the fastening device for the large-diameter steel pipe piles can be removed.

Claims

1. A fastening device for connecting large diameter steel pipe piles, arranged at the opening of the pile foundation, characterized in that: The base has a mounting hole which passes through the base from top to bottom. The mounting hole has the same outer contour as the steel pipe to be installed and has a diameter larger than the outer diameter of the steel pipe to be installed. At least three positioning components and at least three fixing components are arranged at the edge of the installation hole and are rotationally symmetrically distributed with the center of the installation hole as a fixed point; Each positioning member has a positioning card that can be extended and retracted toward the center of the mounting hole, and is used to radially position the steel pipe; the end of the positioning card facing the center of the mounting hole is the front end of the positioning card. When the positioning card is fully extended, the front end of the positioning card is tangent to a virtual circle whose diameter is smaller than the diameter of the steel pipe; when the positioning card is fully retracted, the front end of the positioning card is tangent to a virtual circle whose diameter is larger than the diameter of the steel pipe; Each fastening member has an active tongue that can extend and retract toward the center of the mounting hole, and the front end of the active tongue is used to provide friction to the outer wall of the steel pipe, and the sum of the friction provided by all active tongues is greater than the gravity of the steel pipe; the end of the active tongue facing the center of the mounting hole is the front end of the active tongue, and when the active tongue is fully extended, the front end of the active tongue is tangent to a virtual circle with a diameter smaller than the diameter of the steel pipe; when the active tongue is fully retracted, the front end of the active tongue is tangent to a virtual circle with a diameter greater than the diameter of the steel pipe; The center of each virtual circle coincides with the center of the mounting hole.

2. The fastening device for connecting large-diameter steel pipe piles according to claim 1, characterized in that: The utility model has four positioning components and four fixing components, and the positioning components and the fixing components are crossed and evenly distributed around the installation hole.

3. The fastening device for connecting large-diameter steel pipe piles according to claim 1, characterized in that: A number of auxiliary reinforcement blocks are arranged at the edge of the mounting hole and are rotationally symmetrically distributed with the center of the mounting hole as a fixed point; The auxiliary reinforcement block is fixed to the steel pipe by welding to the outer wall of the steel pipe; a part of the auxiliary reinforcement block is located on the seat; The auxiliary reinforcement blocks, the positioning components and the clamping components are cross-distributed around the installation holes.

4. The fastening device for connecting large-diameter steel pipe piles according to claim 1, characterized in that: The base comprises beams distributed around the pile foundation opening, the beams are connected end to end to form a square, and the beams are I-beams; A fixing member is arranged on the virtual line between the midpoint of each beam and the center of the mounting hole; A bottom plate is arranged between the cross beam and the pile foundation opening, the bottom plate is arranged horizontally, a mounting hole is provided in the center, and the edges around the bottom plate are fixed on the cross beam; Positioning members are arranged on the bottom plate at the diagonal lines of the square.

5. The fastening device for connecting large-diameter steel pipe piles according to claim 1, characterized in that: The positioning member comprises a pair of parallel vertical plates fixed on the base, a positioning clamping plate is arranged in the gap formed between the two vertical plates, and the axis of the positioning clamping plate coincides with the ray passing through the center of the installation hole; The two vertical plates are provided with strip holes opposite to each other, the lower end of the strip hole is inclined toward the center of the mounting hole, and the upper end of the strip hole is inclined away from the center of the mounting hole, and the inclination angle is: forming an angle of 10°-45° with the plumb line; Pins are arranged on both sides of the positioning card plate, and the pins are inserted into the strip holes and are clearance-matched with the strip holes; At least when the pin shaft slides to the lower end of the strip hole, the front end of the positioning clamp plate is tangent to a virtual circle whose diameter is smaller than the diameter of the steel pipe; when the pin shaft slides to the upper end of the strip hole and has not reached the notch, the front end of the positioning clamp plate is tangent to a virtual circle whose diameter is larger than the diameter of the steel pipe.

6. The fastening device for connecting large-diameter steel pipe piles as claimed in claim 5, characterized in that: The upper end of the strip hole is close to the side away from the center of the mounting hole, and a notch for accommodating the pin is provided; A handle extending out of the slit and used for moving the positioning card plate is arranged on the upper end of the positioning card plate.

7. The fastening device for connecting large-diameter steel pipe piles according to claim 1, characterized in that: The fastening member has a hinge seat arranged on the base; a movable latch tongue; the rear end of the movable latch tongue is hinged to the hinge seat; The front end of the movable tongue is an arc-shaped edge. The movable tongue rotates with the hinge seat as the center until the front end points to the center direction of the mounting hole and forms any angle of 10°-30° with the horizontal plane. The arc-shaped edge can be tangent to the plumb line. The curved edges have a pattern that increases friction; A support column is arranged on the base, a telescopic rod is arranged on the support column, one end of the telescopic rod is hinged to the support column, and the other end is hinged to the front end of the movable latch tongue.

8. The segmented installation method of large diameter steel pipe piles is characterized by: The steps are: Step 1: Arrange the fastening device for docking the large-diameter steel pipe piles according to claim 1 at the opening of the pile foundation, and correct the positioning so that the center of the installation hole is aligned with the center of the pile foundation hole; Step 2: Lift the steel pipe in sections, pass the first section of the steel pipe through the installation hole and lift it down into the pile foundation hole, the upper end of the steel pipe is exposed above the installation hole, and stop lifting; Step 3: Use positioning components to radially position the steel pipe; Step 4: Use the clamping member to contact and clamp the outer wall of the steel pipe to fix the steel pipe in the axial direction; Step 5: Weld the auxiliary reinforcement blocks around the steel pipe; after welding, loosen the positioning components and the clamping components, and the steel pipe slides down due to gravity until the auxiliary reinforcement blocks contact the base; Step 6: Use the positioning component to locate the center of the steel pipe; use the clamping component to contact and clamp the outer wall of the steel pipe; Step 7: Weld the auxiliary clamping plate at the upper end of the steel pipe 50cm away from the port; after welding, hoist the second section of the steel pipe, butt the upper and lower sections of the steel pipe and align them before welding; after welding, disconnect the welding of the auxiliary reinforcement block and the steel pipe, loosen the positioning component and the clamping component, lower the first section of the steel pipe and the second section of the steel pipe into the pile hole; and make the upper end of the second section of the steel pipe partially exposed above the installation hole, and stop hanging; Step 8: Repeat steps 3-7 until all sections of steel pipes are lowered; Step 9: After the steel pipe is lowered, the upper end of the last section of the steel pipe is radially positioned by using a positioning member so that the steel pipe is in the designed position in the radial direction; the clamping member is contacted and clamped with the outer wall of the steel pipe to fix the steel pipe in the axial direction; Then hoist the sonic detection pipe and auxiliary steel cage, and perform the pile foundation conduit method of pouring; Step 10: After the pile foundation conduit method is used to pour the concrete until it begins to set, the fastening device for the large-diameter steel pipe piles can be removed.

9. The method for installing large-diameter steel pipe piles in sections according to claim 8, characterized in that: The center of the steel pipe is positioned by using a positioning component, specifically: the pin shafts on both sides of the positioning clamp are respectively slid down toward the lower end of the strip hole, and the front end of the positioning clamp is extended, and the depth of the pin shafts on both sides of each positioning clamp sliding down toward the lower end of the strip hole is different, resulting in different lengths of the front end of the positioning clamp extending, so as to achieve different pushing distances on the outer wall of the steel pipe, so that the steel pipe is in the designed position in the radial direction.

10. The method for installing large-diameter steel pipe piles in sections according to claim 8, characterized in that: The method of using the clamping member to contact and clamp the steel pipe is specifically as follows: starting the telescopic rod, pushing the movable clamping tongue and rotating it around the hinge seat, so that the front end of the movable clamping tongue is pressed against the steel pipe wall, increasing the friction between the front end of the movable clamping tongue and the steel pipe wall, and offsetting the gravity of the steel pipe.

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