Steel tube concrete connection node and its construction method

Abstract

A steel tube concrete connection node and a construction method thereof, the connection node comprising: a first clamp, a second clamp and a plurality of fastening components, the second clamp being a semicircular cylinder designed to be concentric, coaxial and cocircular with the first clamp, and being fastened by hinges to form a tight-allowance cylindrical cylinder structure, scale lines are provided at intermediate height positions on the first clamp and the second clamp, and support plate insertion holes and observation holes are provided along the scale lines; the plurality of fastening components are used to fix the first clamp and the second clamp, when the connection node is inserted into a lower steel tube, the positioning support plate is clamped in position so that the lower steel tube port is flush with the scale lines, at this time, the upper steel tube is installed to dock with the lower steel tube, the clamp is fixed by the fastening components, the positioning support plate is pulled out and the upper and lower steel tubes are spot welded through the support plate insertion holes, after the clamp is removed, the upper and lower steel tubes are circumferentially welded, thereby realizing quick and accurate welding of two sections of steel tube concrete to be poured.

Description

Technical Field

[0001] The invention relates to the technical field of steel tube concrete structures, in particular to a steel tube concrete connection node and a construction method thereof. Background Art

[0002] Steel tube concrete structure is a composite structure formed by filling concrete inside a steel tube. The characteristics of steel tube concrete structure are its high load-bearing capacity, good seismic performance and high construction efficiency. Due to the synergistic effect of steel tube and concrete, steel tube concrete has high compressive strength and durability, can withstand large loads and remain stable in harsh environments.

[0003] Welding connection is one of the most common connection methods between steel tube concrete. The connection of steel tubes in traditional steel tube concrete structures generally adopts the process technology and construction method of manual lifting, direct docking by lifting equipment, and welding after overlap, which makes it difficult to ensure the docking accuracy of steel tube concrete. Summary of the invention

[0004] The object of the present invention is to provide a steel tube concrete connection node and a construction method thereof, which can quickly and accurately combine, assemble and weld two sections of steel tube concrete to be poured that need to be connected together.

[0005] The technical solution of the present invention is:

[0006] A steel tube concrete connection node, comprising: a first clamp, a semicircular cylinder; a second clamp, a semicircular cylinder designed to be concentric, coaxial and cocircular with the first clamp, connected to the first clamp by a hinge, the hinge adopts a heavy-duty high-precision hinge, the first clamp and the second clamp are buckled together by the hinge to form a tight-allowance cylindrical cylinder structure, and are sleeved on the spliced ​​steel tube concrete, scale lines are provided at the middle height positions of the first clamp and the second clamp, and support plate insertion holes and observation holes are provided along the scale lines, the observation holes and the support plate insertion holes are consistent in height position on the tight-allowance cylindrical cylinder structure, the observation holes are convenient for observing the docking of the upper steel pipe and the lower steel pipe through the observation holes, ensuring that the docking is quickly completed in one time, and the upper and lower steel pipes after docking can also be spot welded through the observation holes, the support plate insertion holes of the first clamp and the support plate insertion holes of the second clamp are symmetrically arranged; a plurality of groups of fastening components are used to fix the first clamp and the second clamp, each group of fastening components comprises: two symmetrically arranged fastening ribs, each fastening rib is provided with a positioning pin hole and bolt mounting holes, the two fastening ribs are respectively arranged on the ends of the first clamp and the second clamp away from the hinge; a locating pin is inserted into the two locating pin holes; a connecting bolt is inserted into the two bolt mounting holes for fixing the two fastening ribs; a positioning support plate can be inserted into the other support plate insertion hole from one of the support plate insertion holes so that the two ends are respectively located in the two support plate insertion holes, and are located in the middle position of the tight margin cylindrical body structure, and are used to position the lower steel pipe. The positioning support plate is inserted from the support plate insertion hole, and the position can be stuck so that the lower steel pipe does not move up, ensuring that the middle height position of the clamp is flush with the port of the lower steel pipe; the main function of the positioning support plate is to ensure that the lower steel pipe can be supported by the positioning support plate when the connection node is inserted into the lower steel pipe, confirm from the observation hole whether the port surface of the lower steel pipe is at the scale line position, and lightly tighten the bolts to preliminarily fix the lower steel pipe, and then take out the positioning support plate, and mechanically hoist the upper steel pipe, slowly enter the connection node, and align with the top surface of the lower steel pipe, and fix the upper steel pipe after confirming through the observation hole.

[0007] Furthermore, the locating pin hole is a conical channel, and the locating pin is a conical locating pin that matches the locating pin hole structure, so that the positioning and assembly accuracy of the first clamp and the second clamp is higher, and the radial, axial and circumferential positioning of the two clamps are more precise and interference-free, thereby ensuring geometric accuracy and working accuracy. By fastening the locating pin hole and the locating pin on the rib plate, and using the bolt mounting hole and the through-bolt, the clamp can be easily and quickly disassembled and assembled, and it is more firm and reliable.

[0008] Furthermore, hinge mounting platforms are provided on the side surfaces of the first clamping mold and the second clamping mold, and the two blades of the hinge are respectively fixed on the corresponding hinge mounting platforms.

[0009] Furthermore, a positioning groove is provided on the hinge installation platform of the first clamp, and a positioning boss matching the positioning groove structure is provided on the hinge installation platform of the second clamp, so that the positioning and assembly accuracy of the two clamps is higher, and the geometric accuracy and working accuracy are guaranteed.

[0010] Furthermore, one end surface of the positioning support plate is a front striking working surface, and the other end surface of the positioning support plate is a rear striking working surface. A hook tongue is provided at one end of the positioning support plate close to the front striking working surface, thereby eliminating the unsafe phenomena such as the laborious and time-consuming manual lifting of the docking equipment, and the possibility of falling or tilting and injuring people.

[0011] Furthermore, the tube mouths at both ends of the tight-allowance cylindrical tube structure formed by the buckling of the first clamp and the second clamp adopt a tapered chamfer transition design, which not only enables the two steel pipes to be quickly connected together through the clamp when they are put together and assembled, but also is safe and labor-saving, reduces the time occupied by the lifting machinery, and reduces the labor intensity of the workers.

[0012] Furthermore, a construction method of a steel tube concrete connection node comprises the following steps:

[0013] Step 1: Select a tight-allowance cylindrical structure with an inner diameter matching the outer diameter of the steel tube concrete according to the outer diameter, insert the positioning support plate from the support plate insertion hole, use a hoist to hoist the tight-allowance cylindrical structure formed by the first clamp and the second clamp, and put it on the lower steel pipe. Observe and adjust the position of the tight-allowance cylindrical structure through the observation hole to ensure that the lower steel pipe port is aligned and that the lower steel pipe port surface is flush with the scale line position of the connection node. At this time, drive the positioning pin, tighten the connecting bolts on the fastening rib plate, and then pull out the positioning support plate. After that, the support plate insertion hole is used as an observation welding hole;

[0014] Step 2: Lift the upper steel pipe, insert it into the upper part of the tight allowance cylindrical structure and slowly drop it down. Observe and adjust the position of the upper steel pipe through the observation hole to ensure that the upper and lower steel pipe ports are aligned. At this time, tighten the connecting bolts on the tightening rib plate and tap the positioning pin to make the positioning of the tight allowance cylindrical structure more accurate. In this process, tighten the connecting bolts while observing the docking of the upper and lower steel pipes, and make compensation adjustments if necessary;

[0015] Step 3: After confirming that the upper steel pipe and the lower steel pipe are completely aligned, spot welding and stage welding are performed in the insertion hole and the observation hole of the support plate. After welding, remove the connecting bolts and positioning pins, and remove the first clamping mold and the second clamping mold;

[0016] Step 4: After removing the first clamp and the second clamp, the butt joint of the upper steel pipe and the lower steel pipe is completely exposed. At this time, the butt joint of the upper steel pipe and the lower steel pipe is welded in a whole circle.

[0017] Furthermore, a processing and manufacturing process of parts of a steel tube concrete connection node includes the following steps:

[0018] Step 1: Cut the clamping mold; the length is controlled to be 3 times the outer diameter D of the steel tube concrete to be poured, that is, the net length of the cut clamping mold is 3D. At the same time, the upper and lower end surfaces of the two clamping molds are finely processed;

[0019] Step 2: Turn the inner hole of the clamping die; roughly turn the inner circle of the bar material so that the inner hole diameter d is equal to four-fifths of the outer diameter D of the steel tube concrete to be poured, that is, the size of the inner hole of the clamping die after the first processing is 4 / 5D; fine turn the outer circle of the bar material so that the outer diameter is equal to 1.15 to 1.20 times the outer diameter D of the steel tube concrete to be poured, that is, the size of the outer diameter of the clamping die after the first processing is 1.15D to 1.20D;

[0020] Step 3: Use a CNC milling machine to split the cylindrical clamp into two clamps, the first clamp and the second clamp, so that the first clamp and the second clamp meet the concentric, coaxial and cocircular design; thereafter, use a special fixture to process on a metal cutting device to finely process: the first clamp boss plane, the first clamp boss side surface and the first clamp positioning assembly split surface, the first clamp tight allowance plane, a total of 4 positioning matching surfaces;

[0021] Step 4: Similarly, the second clamping die positioning groove plane, the second clamping die positioning groove side surface, the second clamping die positioning assembly split surface, and the second clamping die tightening allowance plane are also finely processed;

[0022] Step 5: insert a 2.00mm thick copper plate or silicon steel sheet between the tight margin plane of the first clamp and the tight margin plane of the second clamp to close the tight margin space between the first clamp and the second clamp to form a relatively closed cylinder for easy turning. Use a clamp to assemble the first clamp and the second clamp together, and turn the outer circle of the clamp assembly on the machining center. The machining amount is 5mm to 10mm, that is, the final outer diameter of the clamp is 1.13 to 1.15 times the outer diameter D of the steel tube concrete to be poured, that is, the final outer diameter size of the clamp is 1.13D to 1.15D, and scale lines are processed in the middle of the outer cylindrical surface of the first clamp and the second clamp;

[0023] Step 6: Weld the fastening ribs; process the positioning pin holes and bolt installation holes on the fastening ribs, and install the positioning pins and connecting bolts; weld 2 fastening ribs on the upper and lower parts of the two clamps, for a total of 4 fastening ribs;

[0024] Step 7: Install the hinges; process the hinge installation platform of the first clamping mold and the hinge installation platform of the second clamping mold, as well as the hinge installation screw holes on the two clamping molds, and install the two hinges in place;

[0025] Step 8: Use the hinges, positioning pins and connecting bolts installed in place to ensure that the first clamp and the second clamp are tightly installed in place. On the CNC lathe equipment, use the outer cylindrical surface and the two end surfaces of the tight allowance cylindrical barrel structure formed by the two clamps as the processing alignment reference to process the support plate insertion holes in the middle of the two clamps, as well as the observation holes of the first clamp and the second clamp;

[0026] Step 9: On the CNC lathe equipment, the outer cylindrical surface and the two end surfaces of the tight allowance cylindrical barrel structure formed by the two clamps are used as the machining alignment reference, and the inner cylindrical surface of the clamp is machined to make the inner hole diameter equal to the outer diameter D of the steel tube concrete to be poured; at the same time, the barrel hole of the tight allowance cylindrical barrel structure formed by the buckling of the first clamp and the second clamp is processed with a 1:80 taper transition, so that the upper and lower holes of the two clamps are in the shape of a "micro-trumpet", so that it is convenient to insert the lower steel pipe and the upper steel pipe, and realize the rapid alignment and positioning of the steel tube concrete to be poured.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention utilizes the concentric, coaxial, cocircular and tight margin processing, manufacturing and assembly principles of the first clamping mold and the second clamping mold to quickly and accurately combine, assemble, connect and weld the two sections of steel pipes to be poured with concrete, thereby realizing the complete assembly welding of the two sections of steel pipe concrete to be poured. This is not only fast and accurate, but also the stiffness, strength and toughness of the butt joint and welding nodes are higher than those of the original steel pipe parent material itself.

[0029] 2. The present invention uses a fastening component to achieve higher positioning and assembly accuracy of the first clamp and the second clamp, and the geometric accuracy and working accuracy are guaranteed. A fastening rib is provided at the tight allowance process seam between the first clamp and the second clamp, and the bolt mounting holes of the fastening rib are used in conjunction with the through bolts, so that the clamp can be easily and quickly disassembled and assembled, and it is more firm and reliable.

[0030] 3. The middle scale lines and observation holes on the first clamp and the second clamp of the present invention can facilitate observation of the docking status of the two steel pipes, ensuring rapid docking in one go. The coordinated installation and use of the support plate insertion hole and the positioning support plate eliminates the laborious and time-consuming, unsafe phenomena such as injuries caused by falling or skewing of the traditional manual lifting of the docking equipment.

[0031] 4. The steel tube concrete connection node clamping structure of the present invention adopts the processing, manufacturing process and construction mode of splitting-inserting-inserting-fastening and then welding, which ensures that the radial and axial connections of the two steel tube concretes to be poured are accurate and the welding is firm. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a front view of the internal structure schematic diagram of the present invention.

[0033] Figure 2 for Figure 1 AA section view in.

[0034] Figure 3 for Figure 1 BB section view in.

[0035] Figure 4 This is the front view of the first clamp.

[0036] Figure 5 for Figure 4 CC section view.

[0037] Figure 6 This is the front view of the second clamp.

[0038] Figure 7 for Figure 6 Middle DD section view.

[0039] Figure 8 It is a schematic diagram of the positioning support plate structure.

[0040] Among them, 1. first clamp, 2. second clamp, 3. hinge, 31. hinge installation platform, 32. positioning groove, 33. positioning boss, 34. hinge installation screw, 4. pouring concrete, 5. fastening assembly, 51. first group of fastening assembly, 52. second group of fastening assembly, 53. positioning pin, 54. connecting bolt, 6. steel tube concrete, 61. upper steel pipe, 62. lower steel pipe, 7. support plate insertion hole, 8. positioning support plate, 81. front striking working surface, 82. rear striking working surface, 83. hook tongue, 9. scale line, 10. observation hole. DETAILED DESCRIPTION

[0041] Combine the following Figures 1 to 8 , the specific embodiments of the present invention are described in detail. In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0043] Example

[0044] like Figure 1 As shown, a steel tube concrete connection node includes: a first clamping mold 1, a second clamping mold 2 and a plurality of fastening components 5, the first clamping mold 1 is a semicircular cylinder; the second clamping mold 2 is a semicircular cylinder designed to be concentric, coaxial and cocircular with the first clamping mold 1, the first clamping mold 1 and the second clamping mold 2 are connected by a hinge 3, and the hinge 3 adopts a heavy-duty high-precision hinge, such as Figure 2 As shown, the first clamping mold 1 and the second clamping mold 2 are buckled together by hinges 3 to form a tight-end cylindrical structure, and are sleeved on the spliced ​​steel tube concrete 6. The two steel tube concrete 6 that need to be butt-jointed are respectively called upper steel tube 61 and lower steel tube 62. Figure 3 As shown, the steel tube concrete 6 includes a steel tube and a cast concrete 4 filled inside. Figure 4 and Figure 6 As shown, the first clamping die 1 and the second clamping die 2 are both provided with scale lines 9, which are arranged along the outer circumference of the tight-allowance cylindrical structure, and support plate insertion holes 7 and observation holes 10 are arranged along the scale lines 9. The scale lines 9 are mainly convenient for horizontal positioning, such as Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the first clamping die 1 and the second clamping die 2 are both provided with an observation hole 10 on their sides, and the observation hole 10 is consistent with the height position of the support plate insertion hole 7 on the tight margin cylindrical structure. The observation hole 10 is convenient for observing the docking of the upper steel pipe 61 and the lower steel pipe 62 to ensure that they are docked in place quickly at one time, and the observation hole 10 can also be used to complete spot welding of the upper steel pipe 61 and the lower steel pipe 62 after docking, as shown in FIG. Figure 5 and Figure 7As shown, the support plate insertion hole 7 of the first clamping mold 1 and the support plate insertion hole 7 of the second clamping mold 2 are symmetrically arranged; multiple groups of fastening components 5 are used to fix the first clamping mold 1 and the second clamping mold 2, and each group of fastening components 5 includes: two symmetrically arranged fastening ribs, each fastening rib is provided with a positioning pin hole and a bolt mounting hole, the two fastening ribs are respectively arranged on the first clamping mold 1 and the second clamping mold 2 at one end away from the hinge 3, and the positioning pin 53 is inserted into the two positioning pin holes; the connecting bolt 54 is inserted into the two bolt mounting holes to fix the two fastening ribs; wherein the first group of fastening components 51 is arranged near the top position of the tightening margin cylindrical barrel structure, and includes two fastening ribs, one of which is provided with a fastening rib The first clamping mold 1 is arranged on the second clamping mold 2, and the other fastening rib plate is arranged on the second clamping mold 2. The locating pin 53 is inserted into the two locating pin holes, and the connecting bolt 54 is inserted into the two bolt mounting holes to fix the two fastening rib plates of the first group of fastening components 51. The second group of fastening components 52 is arranged near the bottom of the tight allowance cylindrical barrel structure, and one fastening rib plate is arranged on the first clamping mold 1, and the other fastening rib plate is arranged on the second clamping mold 2. The locating pin 53 is inserted into the two locating pin holes, and the connecting bolt 54 is inserted into the two bolt mounting holes to fix the two fastening rib plates of the second group of fastening components 52. Through the upper and lower groups of fastening components 5, the positioning of the connection node is more accurate and in place; Figure 3 As shown, the positioning support plate 8 can be inserted from one of the support plate insertion holes 7 into the other support plate insertion hole 7, so that the two ends are respectively located in the two support plate insertion holes 7, and are located in the middle position of the tight margin cylindrical structure, which is used to position the lower steel pipe 62. When the connection node is inserted into the lower steel pipe 62, the positioning support plate 8 is locked in position so that the lower steel pipe 62 cannot move up, thereby playing a positioning guarantee role that the clamping mold scale line 9 is flush with the end of the lower steel pipe 62. The main function of the positioning support plate 8 is to ensure that the lower steel pipe 62 is supported by the positioning support plate 8 when the connection node is inserted into the lower steel pipe 62, confirm from the observation hole 10 whether the lower steel pipe 62 is at the scale line 9 position, and lightly tighten the bolts to preliminarily fix the lower steel pipe 62, and then take out the positioning support plate 8, and mechanically lift the upper steel pipe 61, slowly enter the connection node, and align with the top surface of the lower steel pipe 62. After confirming through the observation hole 10, fix the upper steel pipe 61.

[0045] like Figure 5 and Figure 7 As shown, the locating pin hole is a conical channel, and the locating pin 53 is a conical locating pin that matches the locating pin hole structure, so that the positioning and assembly accuracy of the first clamp 1 and the second clamp 2 are higher, and the radial, axial and circumferential positioning of the two clamps are more precise and interference-free, thereby ensuring geometric accuracy and working accuracy. By fastening the locating pin hole on the rib plate and the locating pin 53, and using the bolt mounting hole and the through-type connecting bolt 54, the clamps can be easily and quickly disassembled and assembled, and are more firm and reliable.

[0046] like Figure 1 , Figure 2 , Figure 5 and Figure 7 As shown, hinge mounting platforms 31 are provided on the side surfaces of the first clamping mold 1 and the second clamping mold 2 , and two blades of the hinge 3 are respectively fixed on the corresponding hinge mounting platforms 31 .

[0047] like Figure 5 and Figure 7 As shown, a positioning groove 32 is provided on the hinge mounting platform 31 of the first clamp 1, and a positioning boss 33 matching the positioning groove 32 structure is provided on the hinge mounting platform 31 of the second clamp 2. Through the cooperation of the positioning groove 32 and the positioning boss 33, the positioning and assembly accuracy of the two clamps are made higher, and the geometric accuracy and working accuracy are guaranteed.

[0048] like Figure 3 and Figure 8 As shown, one end face of the positioning support plate 8 is a front striking working surface 81, and the other end face of the positioning support plate 8 is a rear striking working surface 82. A hook tongue 83 is provided at one end of the positioning support plate 8 close to the front striking working surface 81. When the connection node is inserted into the lower steel pipe 62, the positioning support plate 8 is locked in position so that the lower steel pipe 62 cannot move up, thereby playing a role in positioning and ensuring that the clamping mold scale line 9 is flush with the end of the lower steel pipe 62, and can also play a role in supporting the weight of the connection node to a certain extent, eliminating the unsafe phenomena such as the laborious and time-consuming manual lifting of the docking equipment, and the falling or tilting that may injure people.

[0049] In some embodiments, the barrel mouths at both ends of the tight-allowance cylindrical barrel structure formed by the first clamp 1 and the second clamp 2 are designed to be tapered chamfered transition structures, and upper and lower steel pipe loading ports are designed. This not only allows the two steel pipes to be quickly connected together through the clamps when they are put together and assembled, but also is safe and labor-saving, reduces the time occupied by lifting machinery, and reduces the labor intensity of workers.

[0050] A construction method for a steel tube concrete connection node comprises the following steps:

[0051] The first step: according to the outer diameter of the steel tube concrete 6 to be poured, a connection node with an inner diameter matching its outer diameter is selected, which can also be said to be a tight-allowance cylindrical structure formed by the first clamping mold 1 and the second clamping mold 2. The connection node is hoisted by a hoist and inserted into the lower steel tube 62. The positioning support plate 8 is inserted from the support plate insertion hole 7. According to the scale line 9 of the connection node, the position of the tight-allowance cylindrical structure is observed and adjusted through the observation hole 10 to ensure that the end surface of the lower steel tube 62 is flush with the scale line 9 of the connection node. At this time, the positioning pin 53 is driven in, and the connecting bolt 54 on the tightening rib plate is tightened. The connecting bolt 54 on the upper tightening rib plate should be tightened 1 to 1.5 turns less, which can prevent the connection node from loosening and sliding down, and leave a gap margin for the insertion of the upper steel tube 61. Then the positioning support plate 8 is pulled out. After that, the support plate insertion hole 7 is used as an observation welding hole;

[0052] Step 2: Lift the upper steel pipe 61, insert it into the upper part of the connection node and slowly drop it. According to the scale line 9 of the connection node, observe and adjust the position of the upper steel pipe 61 through the observation hole 10 to ensure that the ports of the upper steel pipe 61 and the lower steel pipe 62 are aligned. At this time, tighten the connection bolts 54 on the fastening rib plate, and tap the positioning pins 53 on the upper and lower fastening rib plates to make the positioning of the connection node more accurate. In this process, tighten the connection bolts 54 while observing the docking of the upper steel pipe 61 and the lower steel pipe 62, and make compensation adjustments when necessary.

[0053] Step 3: After confirming that the upper steel pipe 61 and the lower steel pipe 62 are completely aligned, spot welding and staged welding are performed in the multiple observation holes 10 and the two support plate insertion holes 7 according to the steel pipe welding technical requirements and quality standards. When the welding in the holes is completed, the connecting bolts 54 and the positioning pins 53 can be removed to dismantle the connection nodes;

[0054] Step 4: After removing the connection node, the butt joint of the upper steel pipe 61 and the lower steel pipe 62 is completely exposed, providing space and conditions for full circle welding of the butt steel pipes. At this time, full circle welding is performed in accordance with the steel pipe welding technical requirements and quality standards until the welding meets the standards.

[0055] A processing and manufacturing process for parts of a steel tube concrete connection node includes the following steps:

[0056] Step 1: Cut the clamping mold; the length is controlled to be 3 times the outer diameter D of the steel tube concrete 6 to be poured, that is, the net length of the cut clamping mold is 3D, and at the same time, the upper and lower end surfaces of the two clamping molds are finely processed;

[0057] Step 2: Turn the inner hole of the clamping die; roughly turn the inner circle of the bar material so that the inner hole diameter d is equal to four-fifths of the outer diameter D of the steel tube concrete 6 to be poured, that is, the size of the inner hole of the clamping die after the first processing is 4 / 5D; fine turn the outer circle of the bar material so that the outer diameter is equal to 1.15 to 1.20 times the outer diameter D of the steel tube concrete 6 to be poured, that is, the size of the outer diameter of the clamping die after the first processing is 1.15D to 1.20D;

[0058] Step 3: Use a CNC milling machine or machining center to split the cylindrical clamp into two clamps, i.e., the first clamp 1 and the second clamp 2, so that the first clamp 1 and the second clamp 2 meet the concentric, coaxial and cocircular design; thereafter, use a special fixture to finely machine on the metal cutting equipment: the first clamp boss plane, the first clamp boss side surface and the first clamp positioning assembly split surface, the first clamp tight allowance plane, a total of 4 positioning matching surfaces;

[0059] Step 4: Similarly, the second clamping die positioning groove plane, the second clamping die positioning groove side surface, the second clamping die positioning assembly split surface, and the second clamping die tightening allowance plane are also finely processed;

[0060] Step 5: insert a 2.00mm thick copper plate or silicon steel sheet between the tight margin plane of the first clamping die 1 and the tight margin plane of the second clamping die 2, so that the tight margin space between the first clamping die 1 and the second clamping die 2 is closed to form a relatively closed cylinder, which is convenient for turning processing. The first clamping die 1 and the second clamping die 2 are assembled together by using a fixture, and the outer circle of the clamping die assembly is processed on a machining center for turning processing. The processing amount in the diameter direction is 5mm to 10mm, that is, the final outer diameter of the clamping die is 1.13 to 1.15 times the outer diameter D of the steel tube concrete 6 to be poured, 1.13D to 1.15D, and a scale line 9 is processed in the middle of the outer cylindrical surface of the first clamping die 1 and the second clamping die 2;

[0061] Step 6: Weld the fastening ribs; process the positioning pin holes and bolt installation holes on the fastening ribs, and install the positioning pins 53 and the connecting bolts 54; weld a set of fastening components 5 on the upper and lower parts of the two clamps, each set of fastening components 5 includes two fastening ribs, a total of 4 fastening ribs;

[0062] Step 7: Install the hinge 3; Process the hinge mounting platform 31 of the first clamping mold 1 and the hinge mounting platform 31 of the second clamping mold 2, as well as the hinge mounting screw holes on the two clamping molds, and install the two hinges 3 in place through the hinge mounting screws 34;

[0063] Step 8: Use the hinge 3, positioning pin 53 and connecting bolt 54 installed in place to ensure that the first clamp 1 and the second clamp 2 are tightly installed in place. On the CNC lathe equipment, use the outer cylindrical surface and the two end surfaces of the tight-allowance cylindrical barrel structure formed by the two clamps as the machining alignment reference to machine the support plate insertion holes 7 in the middle of the two clamps, as well as the observation holes 10 of the first clamp 1 and the observation holes 10 of the second clamp 2;

[0064] Step 9: On the CNC lathe equipment, the outer cylindrical surface and the two end surfaces of the tight allowance cylindrical barrel structure formed by the two clamps are used as the machining alignment reference, and the inner cylindrical surface of the clamp is machined so that the inner hole diameter d is equal to the outer diameter D of the steel tube concrete 6 to be poured. At the same time, the barrel hole of the tight allowance cylindrical barrel structure formed by the first clamp 1 and the second clamp 2 is subjected to a 1:80 taper transition processing, so that the upper and lower holes of the two clamps are in the shape of a "micro-trumpet", so that it is convenient to insert the lower steel pipe and the upper steel pipe, and realize the rapid alignment and positioning of the steel tube concrete to be poured.

[0065] The above disclosures are only several preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A steel tube concrete connection node, characterized in that: include: The first clamping mold (1) is a semicircular cylinder; The second clamping mold (2) is a semicircular cylinder designed to be concentric, coaxial and cocircular with the first clamping mold (1), and is connected to the first clamping mold (1) through a hinge (3). The first clamping mold (1) and the second clamping mold (2) are buckled together through the hinge (3) to form a tight-allowance cylindrical cylinder structure. A scale line (9) is provided at the middle height position of the first clamping mold (1) and the second clamping mold (2), and a support plate insertion hole (7) and an observation hole (10) are provided along the scale line (9). The support plate insertion hole (7) of the first clamping mold (1) and the support plate insertion hole (7) of the second clamping mold (2) are symmetrically arranged. A plurality of sets of fastening components (5) are used to fix the first clamping mold (1) and the second clamping mold (2), each set of fastening components (5) comprising: two symmetrically arranged fastening ribs, each fastening rib is provided with a positioning pin hole and a bolt mounting hole, the two fastening ribs are respectively arranged on one end of the first clamping mold (1) and the second clamping mold (2) away from the hinge (3); a positioning pin (53) is inserted into the two positioning pin holes; and a connecting bolt (54) is inserted into the two bolt mounting holes to fix the two fastening ribs; A positioning support plate (8) which can be inserted from one support plate insertion hole (7) into another support plate insertion hole (7), with both ends respectively located in the two support plate insertion holes (7) and located in the middle of the tight margin cylindrical structure, for positioning the lower steel pipe (62); One end surface of the positioning support plate (8) is a front striking working surface (81), the other end surface of the positioning support plate (8) is a rear striking working surface (82), and a hook tongue (83) is provided at one end of the positioning support plate (8) close to the front striking working surface (81); The barrel openings at both ends of the tight-allowance cylindrical barrel structure formed by buckling the first clamping die (1) and the second clamping die (2) adopt a tapered chamfer transition design; When the steel tube concrete connection node is being constructed: The first step: according to the outer diameter of the steel tube concrete (6), a tight-allowance cylindrical tube structure with an inner diameter matching its outer diameter is selected, and the positioning support plate (8) is inserted from the support plate insertion hole (7). The tight-allowance cylindrical tube structure formed by the first clamping mold (1) and the second clamping mold (2) is hoisted by a hoist, and is inserted onto the lower steel tube (62). The position of the tight-allowance cylindrical tube structure is observed and adjusted through the observation hole (10), and it is ensured that the port of the lower steel tube (62) is aligned with the lower part of the tight-allowance cylindrical tube structure, and that the port surface of the lower steel tube (62) is flush with the scale line (9) of the connection node. At this time, the positioning pin (53) is driven in, and the connecting bolt (54) on the fastening rib plate is tightened, and then the positioning support plate (8) is pulled out. Thereafter, the support plate insertion hole (7) is used as an observation welding hole; Step 2: Lift the upper steel pipe (61), insert it into the upper part of the tight allowance cylindrical structure and slowly drop it down. Observe and adjust the position of the upper steel pipe (61) through the observation hole (10) to ensure that the ends of the upper steel pipe (61) and the lower steel pipe (62) are aligned. At this time, tighten the connecting bolts (54) on the fastening rib plate and tap the positioning pin (53) to make the positioning of the tight allowance cylindrical structure more accurate. Step 3: After confirming that the upper steel pipe (61) and the lower steel pipe (62) are completely aligned, spot welding and staged welding are performed in the support plate insertion hole (7) and the observation hole (10). After welding is completed, the connecting bolts (54) and the positioning pins (53) are removed, and the first clamping mold (1) and the second clamping mold (2) are removed; Step 4: After the first clamping die (1) and the second clamping die (2) are removed, the butt joint between the upper steel pipe (61) and the lower steel pipe (62) is completely exposed. At this time, the butt joint between the upper steel pipe (61) and the lower steel pipe (62) is welded in a full circle.

2. A steel tube concrete connection node according to claim 1, characterized in that: The positioning pin hole is a conical channel, and the positioning pin (53) is a conical positioning pin that matches the positioning pin hole structure.

3. A steel tube concrete connection node according to claim 1, characterized in that: Hinge mounting platforms (31) are provided on the side surfaces of the first clamping mold (1) and the second clamping mold (2), and the two blades of the hinge (3) are respectively fixed on the corresponding hinge mounting platforms (31).

4. A steel tube concrete connection node according to claim 3, characterized in that: A positioning groove (32) is provided on the hinge installation platform (31) of the first clamping mold (1), and a positioning boss (33) matching the structure of the positioning groove (32) is provided on the hinge installation platform (31) of the second clamping mold (2).

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