A steel cage guide cone butt joint construction method and connecting sleeve

Abstract

The present invention discloses a method for butt-jointing a guide cone of a steel cage and a connecting sleeve. The butt-jointing method comprises the following steps: step one, processing the main reinforcement of the steel cage; step two, bending, forming and welding the reinforcement; step three, forming the first segment of the steel cage; step four, forming the second segment of the steel cage; step five, forming the remaining segments of the steel cage; etc. The connecting sleeve comprises a first inner screw sleeve and a second inner screw sleeve, the second inner screw sleeve is locked on the end of the main reinforcement of the steel cage by a lock nut, and the first inner screw sleeve and the second inner screw sleeve are connected by a tapered inner shoulder and a threaded connection of a shrinking through hole of the outer screw sleeve. The butt-jointing method utilizes the combined action of the guide cones of the guide and the connecting sleeve to achieve coaxial butt-jointing, so that the main reinforcement of the steel cage is aligned, the end spacing is adjustable, and the spiral line is on the same track. The construction cost is low, the joint connection performance is stable and reliable, and the performance requirements of the Class I joint specified in the industry standard "Technical Specification for Mechanical Connection of Steel Bars" JGJ107 are met.

Description

Technical Field

[0001] The invention relates to the technical field of steel cage butt joint construction, and in particular to a steel cage guide cone butt joint construction method and a connecting sleeve. Background Art

[0002] With the rapid development of new building industrialization, the industrialized production and on-site assembly installation of formed steel products will be the general trend. For example, composite formed steel products such as pile foundation steel cages, ground-anchored wall steel skeletons, coarse-diameter steel meshes, concrete cast-in-place beam-column-slab steel skeletons, and prefabricated assembled concrete component steel skeletons will develop towards factory-based centralized production and modular assembly construction of composite formed steel products. The key factors restricting the industrial installation and application of composite formed steel products are the connection of multiple non-rotatable and non-axially movable fixed steel bars and the construction method of connecting the steel cage or skeleton.

[0003] In the field of construction engineering, it is often necessary to connect multiple fixed steel bars in groups to form a certain steel cage skeleton of a certain building structure. During on-site construction, it is often encountered that the two steel bars to be connected can neither rotate nor move axially. In addition, due to the errors in the connection of the steel bars during cutting, assembly forming, transportation, and hoisting construction, the ends of the two connected steel bars are separated by a certain distance to form a gap. The axes of the two steel bars are often offset and cannot be coaxial. It is difficult for the spiral lines of multiple steel bar threads to be on the same track at the same time. In this case, the straight thread sleeve connection joints such as standard type, positive and negative thread type, extended thread head type, extended thread head single and double lock nut type cannot be effectively and reliably connected, that is, it is impossible to ensure the smooth connection and buckle during sleeve connection, the effective thread length after sleeve connection, and it is impossible to achieve the end faces of the two steel bars after connection to effectively eliminate the thread pair matching gap, thereby affecting the ultimate tensile strength and residual deformation of the steel cage butt joint. In the connection conditions of steel cage skeletons, overall butt joints of steel mesh sheets, "post-cast strips" in building structure construction, connections of prefabricated concrete components, and connections of formed steel bar composite products in cast-in-place concrete projects, it is quite common that groups of multiple fixed steel bars cannot be effectively connected, making it difficult to achieve the Grade I joint performance specified in JGJ107 for the steel cage design requirements.

[0004] The invention patent with application number CN201510909544.4 discloses a new type of coaxial butt joint sleeve for steel bars, comprising a coaxial butt joint sleeve, connecting steel bars I and II connected at both ends of the coaxial butt joint sleeve, one end of the coaxial butt joint sleeve is provided with an equal diameter shrinkage with a diameter larger than the diameter of the connecting steel bar I, a first inner sleeve is provided in the coaxial butt joint sleeve, the outer diameter of the first inner sleeve is larger than the diameter of the equal diameter shrinkage but smaller than the inner diameter of the coaxial butt joint sleeve, a central countersunk hole is opened at one end of the first inner sleeve, the countersunk hole is processed with an internal thread, the end section of the connecting steel bar I is processed with an external thread, and the connecting steel bar I is provided with a central countersunk hole. The end portion passes through the equal-diameter constriction and is screwed together with the internal thread of the countersunk hole of the first inner sleeve. A guide head is provided at the other end of the first inner sleeve. The inner wall of the other end section of the coaxial butt sleeve is provided with an internal thread, which is screwed together with the external thread on the wall of one end of the added second inner sleeve. The center hole of the second inner sleeve is a through hole with an internal thread machined on the inner wall of the through hole. The end section of the connecting steel bar II is machined with an external thread and is screwed together with the internal thread on the inner wall of the through hole. The diameter of the through hole is greater than or equal to the diameter of the guide head. This invention can moderately adjust the length and eccentricity of the steel bar; when the prefabricated column beam is installed in place, the steel bar joint can be fine-tuned to improve the installation accuracy of the component; no material deformation or stress will be generated, and the connection quality is reliable and stable. However, the guiding principle of the coaxial butt sleeve is to guide the guide head into the through hole of the second inner sleeve, and then connect the first inner sleeve with the second inner sleeve through the coaxial butt sleeve, thereby achieving the purpose of connecting the connecting steel bar I with the connecting steel bar II, so as to achieve appropriate adjustment of the length and eccentricity of the steel bars. However, the guide cone head and the through hole are in line contact after connection, so the coaxiality of the connecting steel bar I and the connecting steel bar II after connection is low. Summary of the Invention

[0005] The purpose of the present invention is to provide a construction method for butt jointing of a steel cage guide cone and a connecting sleeve, which solves the problem of rapid coaxial butt jointing under the condition of large deformation during the processing, transportation and lifting of the steel cage.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for butting a steel cage guide cone, comprising the following steps:

[0008] Step 1: Processing the main reinforcement of the steel cage, cutting the main reinforcement to a fixed length, threading the end, grinding and chamfering the end face, using an automated straight thread processing production line or a steel bar sawing machine or a straight thread forming machine to cut the main reinforcement of the steel cage to a fixed length according to the designed length of the steel cage, high-precision roll-forming straight threads, flat grinding and chamfering the steel end face;

[0009] The steel cage segment has a long thread end at one end and a short thread end at the other end. It is composed of multiple steel cage main bars, multiple reinforcing bars and stirrups. The multiple steel cage main bars are welded to the multiple reinforcing bars one by one to form a steel cage structure. The two ends of the steel cage main bars are provided with threaded screw heads, wherein one end is a long thread screw head and the other end is a short thread screw head. The length of the short thread screw head is equal to the internal thread depth of the first internal screw sleeve, and the length of the long thread screw head is equal to the sum of the internal thread depth of the second internal screw sleeve and the thickness of the lock nut. The diameter, length and accuracy of the long thread screw head and the short thread screw head are checked and controlled with a through-ring gauge, a stop ring gauge and a length gauge. After passing the self-inspection, a steel screw head protective cap is added.

[0010] Step 2: bend and weld the reinforcement ribs. The reinforcement ribs are cut, bent and welded on a cutting, bending and welding machine, or cut, bent and welded in steps using a cutting machine and an arc bending machine.

[0011] Step 3: Forming and processing the first section of the steel cage, using fixed support steel plate table molds to fix the two ends of the main reinforcement of the steel cage, the fixed support steel plate table mold is inserted into the mounting seat, or the fixed plate and movable plate of the steel cage roll welding machine are used to fix and position the reinforcement bars one by one, or the steel cage roll welding production line is used for automatic axial positioning, and the main reinforcement bars of the steel cage are welded or tied to multiple reinforcement bars one by one to form the first section of the steel cage;

[0012] After the main bars and reinforcing bars of the first section of the steel cage are welded or tied to form, the stirrups are wound, welded or tied using a steel cage winding machine, a steel cage roll welding machine or a steel cage rolling welding production line;

[0013] The stirrups in the joint connection section are wound together for several turns and stored at both ends of the steel cage without welding. After the steel cage segments are connected on site, the wound stirrups are opened and welded or tied to the main reinforcement of the steel cage, and the stirrups are overlapped and welded;

[0014] The plurality of main reinforcement bars of the reinforcement cage include a plurality of first reinforcement bars and a plurality of second reinforcement bars, the first reinforcement bars and the second reinforcement bars are evenly spaced around the outer circumference of the reinforcement bar, and the length of the first reinforcement bar and the axial offset of the second reinforcement bar are not less than thirty-five times the nominal diameter of the reinforcement bar. In order to increase the rigidity of the reinforcement cage segment during transportation and installation, auxiliary main reinforcement bars are added to the plurality of main reinforcement bars of the reinforcement cage, and an auxiliary main reinforcement bar is connected to one end of the first reinforcement bar or one end of the second reinforcement bar via a connecting sleeve so that the end of the first reinforcement bar is flush with the end of the second reinforcement bar.

[0015] Step 4: Forming and processing the second section of the steel cage. Use the first section of the steel cage to make a template. Form and process the second section of the steel cage according to step 3. Then, mark one of the main bars of the steel cage that is connected to the first section of the steel cage and the second section of the steel cage.

[0016] Step 5: forming and processing the remaining steel cage segments, repeating step 4 to sequentially form and process the remaining steel cage segments;

[0017] Step 6: Inspection of the forming quality of the steel cage segments. The forming quality of the steel cage segments is subject to self-inspection and random inspection by quality inspectors according to the quality of the hidden steel bar engineering of the steel bar sub-project. The quality of the steel cage segment forming processing is first self-inspected. On the basis of passing the self-inspection, the quality inspector will conduct random inspection. After passing the inspection, the adjacent steel cage segments will be prepared for transportation in sequence. Before transportation, a fixed support steel plate table mold is installed at both ends of the steel cage segment.

[0018] Step 7: Hoisting the first section of the steel cage. After the steel cage section is transported to the installation site, use the main and auxiliary hooks of a truck crane or a self-propelled crane to lift the first section of the steel cage, and use the deadweight of the first section of the steel cage to gradually make it vertical or horizontal like a beam steel cage.

[0019] A lifting ring is installed on the fixed support steel plate table form installed on the long thread end of the first segment of the steel cage. The lifting ring and the main hook of the lifting equipment serve as the main lifting point. The short thread end of the first segment of the steel cage is lifted horizontally in combination using the fixed support steel plate table form and the auxiliary hook of the lifting equipment as the auxiliary lifting point. The dead weight of the first segment of the steel cage is gradually used to make it vertical or horizontal.

[0020] Remove the fixed support steel plate formwork and multiple auxiliary main bars at the lower end of the short threaded end of the first segment of the vertical steel cage, or the fixed support steel plate formwork and multiple auxiliary main bars at the connecting end of the horizontal beam steel cage, or remove the fixed support steel plate formwork and multiple auxiliary main bars on the ground before lifting, lower the first segment of the vertical steel cage into the pile hole or the installation position of the beam steel cage until the pile cage has a certain installation height remaining, use the pit mouth fixture on the pile hole wellhead cap or use the reinforcement bar and the crossbeam support to support the first segment of the steel cage, install the lock nut at one end of the long thread head of the steel cage main bar to the root of the thread, screw the second inner screw sleeve until it touches the end face of the steel cage main bar, and wait for the next segment of the steel cage to be connected;

[0021] Step 8: Hoist the second section of the steel cage. Repeat step 7 to hoist the second section of the steel cage in a vertical or horizontal state, position it and lower it, and place it in position according to the marked main reinforcement bars on the first and second sections of the steel cage.

[0022] Before the second section of the steel cage is lowered to prepare for docking with the first section of the steel cage, remove the fixed support steel plate table formwork and multiple auxiliary main bars installed at the lower end of the second section of the vertical steel cage, i.e., the short thread end, or the fixed support steel plate table formwork and multiple auxiliary main bars installed at the connection end of the horizontal beam steel cage. Alternatively, remove the fixed support steel plate table formwork and multiple auxiliary main bars on the ground before lifting, or remove the threaded protective caps at the ends of the main bars of the second section of the steel cage. Insert the outer threaded sleeve into one end of the short threaded end of the main bar of the steel cage, and screw the first inner threaded sleeve until it is tightened against the end face of the main bar of the steel cage, and reach the specified tightening torque value.

[0023] Step 9: Coarsely adjust the position of the first and second segments of the steel cage. When the lower end of the second segment is lowered to the top of the first segment, if the deformation of the main reinforcement of the steel cage exceeds the axial and radial allowable range of the connecting sleeve, the second segment of the steel cage needs to be coarsely adjusted.

[0024] When the axis offset is large, find the marked main reinforcement bars and the main reinforcement bars with the largest offset among the multiple main reinforcement bars in the first section of the reinforcement cage, install guides at the ends of the marked main reinforcement bars and the main reinforcement bars with the largest offset, and after the guides are installed, lower the second section of the reinforcement cage. Under the guidance of the guides, make the main reinforcement bars of the two adjacent reinforcement cage sections correspond to each other, and rely on the deadweight of the second section of the reinforcement cage and the guides to automatically align it into position;

[0025] When the spacing between the ends of the main reinforcement bars of the steel cage exceeds the maximum adjustment value allowed by the connecting sleeve, a connecting sleeve is installed as a traction device at the maximum spacing between the ends of the main reinforcement bars of the second section of the steel cage. By screwing and moving the second inner screw sleeve and the outer screw sleeve, the spacing between the ends of the main reinforcement bars of the steel cage is tightened and adjusted to adjust the spacing at the maximum spacing between the ends of the main reinforcement bars of the second section of the steel cage so that it is controlled within the maximum spacing range allowed by the connecting sleeve. When the adjustment with one connecting sleeve cannot meet the requirements, the number of connecting sleeves can be appropriately increased.

[0026] The first section of the steel cage and the second section of the steel cage are finely adjusted and connected. The first inner screw sleeve is first tightened to the specified torque value, and then the outer screw sleeve is suspended above the first inner screw sleeve by an auxiliary clamp, and the second section of the steel cage is continued to be lowered. In the process of lowering the second section of the steel cage, the first inner screw sleeve first contacts the main reinforcement position of the second inner screw sleeve at the end of the steel cage, and the second inner screw sleeve is unscrewed so that the tapered seat hole of the second inner screw sleeve is fitted with the cone column of the first inner screw sleeve; then the outer screw sleeve is screwed to be connected to the external thread of the second inner screw sleeve, and the specified tightening torque value is reached. Finally, the lock nut is screwed to make the lock nut fit tightly with the outside of the second inner screw sleeve and lock it, and the specified torque value is reached; continue to lower the second section of the steel cage, and when the multiple steel cage main reinforcements of the second section of the steel cage all reach the maximum spacing condition allowed by the connection of the connecting sleeve, they can be connected one by one or multiple times with an installation wrench at the same time, and then the guide is removed;

[0027] After the connection is completed, use a calibrated torque wrench for testing and a caliper for detecting the length of exposed threads to check the installation tightening torque value and the exposed thread length, check the minimum installation tightening torque value between the outer screw sleeve and the second inner screw sleeve, the minimum installation tightening torque value between the lock nut and the second inner screw sleeve, the exposed thread length between the outer screw sleeve and the second inner screw sleeve, and the exposed thread length of the lock nut; the minimum installation tightening torque value should not be less than the minimum tightening torque value specified in the standard; the exposed thread length should be within the length range specified in the standard; when the minimum tightening torque value specified in the standard and the maximum exposed thread length allowed after installation are reached, the connection of the connecting sleeve can be determined to be qualified;

[0028] Step 11: After the first and second sections of the steel cage are connected and fixed, and the corresponding main reinforcement bars in the first and second sections of the steel cage are all connected and inspected to be qualified, the stirrups stored in several circles at the ends of the steel cage sections are released, and the stirrups are welded or tied to the main reinforcement bars of the steel cage, and the two stirrups are overlapped and welded or tied;

[0029] Step 12: Hoist and connect the remaining steel cage segments, repeat steps 7 to 11 respectively, lower the connected steel cage segments to the pile cage wellhead pedestal one by one, use pit fixtures, or reinforcement bars and beams to support the connected steel cage segments, and wait for the next steel cage segment to be connected, until all the steel cage segments are connected.

[0030] Preferably, the mounting seat comprises a base, a pillar and a mounting shaft from bottom to top, and the mounting shaft is cantilevered and mounted on the top of the pillar.

[0031] Preferably, the fixed supporting steel plate table formwork includes a supporting steel plate ring frame, multiple ribs and a connecting sleeve. The supporting steel plate ring frame is in the shape of a circular ring with multiple connecting holes. Multiple connecting holes are evenly spaced on the supporting steel plate ring frame. The threaded heads of multiple main reinforcement bars of the steel cage are fixed at the connecting holes through upper and lower lock nuts. The multiple ribs are vertically and radially distributed around the connecting sleeve, and the connecting sleeve is adapted to the installation axis; the lifting ring is detachably installed in the connecting sleeve.

[0032] Preferably, the pit mouth fixer includes at least two pit mouth fixers used simultaneously when supporting, and the two fixed cross frames are arranged in a staggered manner at different heights to adjust the vertical state of the steel cage segments when docking and the horizontal state of the upper end surface; each pit mouth fixer includes at least one fixed cross frame, two screw support legs, and two connecting pieces; the fixed cross frame includes a cross bar, and a screw support leg is liftably connected to each end of the cross bar by a screw, and the bottom of the screw support leg is a square or circular plate structure; at least two connecting pieces are provided on the cross bar, and the connecting pieces include at least one fixed plate and two U-shaped clips, the fixed plate is a plate-like square structure, fixedly arranged on one side of the cross bar, and a U-shaped clip is movably connected to the upper and lower ends of the fixed plate by bolts, and the main reinforcement of the steel cage is clamped in the two U-shaped clips arranged upper and lower.

[0033] Preferably, the guide includes a first guide lobe and a second guide lobe, and the first guide lobe and the second guide lobe are connected to form a cylindrical shell through a dovetail groove, and an internal threaded hole adapted to the external thread of the second internal screw sleeve is provided at one end of the cylindrical shell.

[0034] A connecting sleeve used in a method for butting a guide cone of a steel cage, comprising a first inner threaded sleeve connected to the end of a main reinforcement bar of a steel cage segment, and a second inner threaded sleeve connected to the end of a main reinforcement bar of another steel cage segment. The second inner threaded sleeve is locked to the end of the main reinforcement bar of the steel cage via a lock nut, and the first inner threaded sleeve and the second inner threaded sleeve are connected via a tapered inner shoulder and a threaded connection via a shrinking through-hole of the outer threaded sleeve.

[0035] The first internal screw sleeve is a sleeve with different tapered columns at both ends. An internal thread, a thread undercut groove and a tapered shoulder column are sequentially arranged on the inner hole wall of the first internal screw sleeve. The internal thread is a right-hand thread.

[0036] The second internal screw sleeve is a sleeve with a tapered seat hole at one end, and threads, thread undercuts and shaft shoulder blocks are sequentially arranged on the inner hole wall and the outer cylindrical wall, wherein the inner thread is a right-hand thread and the thread on the outer wall is a left-hand thread;

[0037] The outer screw sleeve is a sleeve with a narrowed through hole at one end and an internal threaded hole at the other end. Partial left-handed threads and partial light holes are provided on the wall of the internal threaded hole of the sleeve. A first tapered hole seat is provided on the inner side of the narrowed through hole. The first tapered hole seat matches the cone column at one end of the first inner screw sleeve. The depth of the inner threaded hole of the outer screw sleeve is not greater than the sum of the length of the external thread of the second inner screw sleeve and the height of the outer cylinder of the first inner screw sleeve. The internal thread of the outer screw sleeve matches the external thread of the second inner screw sleeve.

[0038] The lock nut is a nut, and its rotation direction and pitch are the same as the internal thread of the second internal thread sleeve;

[0039] The end of the main reinforcement of the steel cage is inserted into the through hole with a shrinkage on the outer screw sleeve, and the conical column of the first inner screw sleeve is against the conical seat hole of the second inner screw sleeve. The outer screw sleeve sleeved outside the first inner screw sleeve is connected to the outer thread of the second inner screw sleeve through a left-handed thread to realize the connection and locking of the ends of the corresponding two main reinforcement bars of the two adjacent steel cage segments. Finally, the second inner screw sleeve is back-pressure-locked by the lock nut.

[0040] Preferably, the outer cylindrical surface of the outer screw sleeve is a semicircular hexagonal prism, a hexagonal body, a dodecagonal body or a cylinder.

[0041] In the present invention, the fixed support steel plate table formwork has the functions of both rigid support and lifting fixture. It can be used as a fixed support positioning auxiliary tool for the forming processing of the steel cage segment, and can also be used as an auxiliary tool for the transportation and lifting of the steel cage segment, which helps to reduce the deformation of the steel cage segment.

[0042] The connecting sleeve utilizes the guide cone principle to automatically align and connect two main bars of the steel cage with a small axis offset. Specifically, the first inner threaded sleeve with a tapered top column and the second inner threaded sleeve with a tapered seat hole are used to realize the self-guiding of the radial offset of the small-deformation steel cage main bar under the condition of small axis offset deformation, the common track of the helical line of the steel cage main bar and the helical line of the connecting sleeve, and the self-adjustment of the end spacing of the steel cage main bar within the range of no more than the maximum spacing allowed by the connecting sleeve. This can ensure that the main bars of the steel cage are quickly docked and stably connected, and the operation is convenient. The tensile strength and residual deformation value after connection meet the performance index requirements of Class I joints specified in the "Technical Code for Mechanical Connection of Steel Bars" JGJ107-2016. The connection quality is stable and reliable, and the comprehensive social, economic and environmental benefits are significantly improved. The system can be widely used in strong connections of cast-in-place concrete structure steel cage skeletons, prefabricated assembled concrete components, pile foundation steel cages, ground-connected wall steel cage skeletons, steel mesh skeletons, and building mixed structure steel skeletons and steel structures, and has a very broad prospect for promotion and application.

[0043] By utilizing the characteristics that the minor diameter of the inner screw hole of the outer screw sleeve is larger than the outer diameter of the first inner screw sleeve, and the end face of the first inner screw sleeve and the inner screw hole shoulder of the outer screw sleeve are freely engaged through the guide cone, the end thread of the main reinforcement of the steel cage is connected with the first inner screw sleeve and the second inner screw sleeve in a spiral common track.

[0044] The self-locking and the matching clearance of the thread pair are eliminated by screwing the lock nut and the second inner screw sleeve together.

[0045] The guide and connecting sleeve traction device are used to adjust and reduce the large deformation of the main reinforcement of the steel cage when it is connected, so that the steel bars of the connecting sleeve are aligned, the spiral line is on the same track and the end spacing can be adjusted, providing basic conditions for safe connection construction.

[0046] The threads at the ends of the main reinforcement of the steel cage are lengthened, and the threads of the lengthened main reinforcement of the steel cage are processed by a high-precision rolling straight thread forming machine. The thread cylindricity and the cumulative error of the pitch are greatly improved, and the tensile strength of the thread is higher than the tensile strength of the steel base material.

[0047] The connecting sleeve can adjust the spacing length of the main reinforcement ends of the steel cage, automatically guide and freely move the outer screw sleeve for fastening, adapting to the actual docking conditions of the variable thread connection length, radial displacement and multi-helix non-co-track of the main reinforcement of the grouped steel cage, solving the problem of rapid installation and docking of the steel cage.

[0048] The coaxial docking construction method of the present invention first utilizes the supporting steel plate table form and the guide to reduce the large deformation adjustment and introduction before the connection of the connecting sleeve, and then utilizes the combined effect of the guide cone of the connecting sleeve, that is, the first inner screw sleeve with a cone top and the second inner screw sleeve with a cone hole to realize the docking of the small deformation steel cage segment. The steel cage docking construction method reduces the large deformation during the steel cage docking construction through the two processes of rough adjustment and precise docking, so that the main reinforcement of the steel cage of the connecting sleeve is aligned, the spiral line is on the same track, and the end spacing is adjustable, providing basic conditions for safe docking construction, low construction cost, stable and reliable connection performance, and playing an important role in improving the stability, reliability and construction convenience of the mechanical connection of grouped fixed steel bars.

[0049] For the connection of prefabricated and assembled concrete components, it can replace the wet connection of grouting sleeves. For the connection of composite steel products such as steel cages, steel skeletons, and steel meshes, it improves the convenience of docking construction and reduces the residual deformation of the joints compared to the upsetting straight thread connection, cold-extruded sleeve connection, and extended wire straight thread connection.

[0050] In step three, the steel cage docking construction adopts a combination of fixed support steel plate formwork and auxiliary main reinforcement for positioning welding and forming. On the one hand, it improves the position accuracy of the main reinforcement welding and forming, and on the other hand, it can be used to reduce the deformation of the steel cage during transportation and hoisting. In the step nine, a guide is used to adjust the large axis offset deformation during the construction of the steel cage, so that it can achieve automatic alignment between the connecting sleeve and the connecting main reinforcement. The connecting sleeve is used as a tractor to control the steel cage end plane formed by three points, so that the spacing between the ends of the main reinforcement of the steel cage is not greater than the maximum adjustment value allowed by the connecting sleeve, so that under the condition of unequal spacing between the main reinforcements of the steel cage, a reliable connection is achieved using a guide cone adjustable straight thread sleeve; a guide cone adjustable straight thread sleeve is used to achieve micro-adjustment connection under the conditions of unequal spacing between the ends of the main reinforcement of the steel cage, axis centerline offset, and non-co-track of multiple spiral threads of the steel bars to be connected, so that it has the flexible docking ability of adjustable spacing between the ends of the steel bars to be connected, self-guiding of eccentric axis displacement, and co-track of multiple connecting spirals. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the connecting sleeve of the present invention;

[0052] Figure 2 Schematic diagram of the cross-sectional structure of the connecting sleeve of the present invention;

[0053] Figure 3 Schematic diagram of the first internal screw sleeve of the present invention;

[0054] Figure 4 Schematic diagram of the second inner screw sleeve of the present invention;

[0055] Figure 5 It is a schematic diagram of the outer screw sleeve of the present invention;

[0056] Figure 6 This is a schematic diagram of the lock nut of the present invention;

[0057] Figure 7 This is a schematic diagram of the steel cage segment forming process of the present invention;

[0058] Figure 8 Schematic diagram of a pit mouth fixture supporting a steel cage segment according to the present invention;

[0059] Figure 9 Schematic diagram of the fixed support steel plate table form and the hanging ring structure of the present invention

[0060] Figure 10 A schematic diagram of a pithead retainer according to the present invention;

[0061] Figure 11 This is a schematic diagram of the guide of the present invention;

[0062] Figure 12 A top view of the guide of the present invention;

[0063] Figure 13 It is a cross-sectional view of the guide of the present invention;

[0064] Figure 14 This is a schematic diagram of the guide in use of the present invention;

[0065] Figure 15 A sectional view of the guide of the present invention in use;

[0066] In the figure: 1. Connecting sleeve; 2. Steel cage segment; 3. Fixed support steel plate table; 4. Pit mouth fixture; 5. Guide; 6. Mounting seat; 7. Hook; 11. First inner screw sleeve; 12. Second inner screw sleeve; 13. Outer screw sleeve; 14. Lock nut; 20. Main reinforcement of steel cage; 21. Reinforcement rib; 30. Support steel plate ring frame; 31. Rib; 32. Connecting sleeve; 40. Fixed cross frame; 50. First guide petal; 51. Second guide petal; 60. Base; 61. Pillar; 62. Mounting shaft; 200. First reinforcement; 201. Second reinforcement; 400. Cross bar; 401. Screw support leg; 402. Connector; 403. Fixing plate; 404. U-shaped clip. DETAILED DESCRIPTION

[0067] The present invention will be further described below with reference to the accompanying drawings:

[0068] like Figures 1 to 15 As shown, a method for connecting a steel cage guide cone and a steel bar guide cone is provided, comprising the following steps:

[0069] Step 1: Processing the main reinforcement 20 of the steel cage, cutting the main reinforcement 20 to a predetermined length, threading the end, grinding and chamfering the end surface, and using an automated straight thread processing production line for steel bars or a steel bar sawing machine or a straight thread forming machine to cut the main reinforcement 20 of the steel cage to a predetermined length, roll-form straight threads with high precision, and grind and chamfer the end surface of the steel bars according to the segment length of the designed length of the steel cage;

[0070] One end of the steel cage segment 2 is a long thread end and the other end is a short thread end. It is composed of a plurality of steel cage main bars 20, a plurality of reinforcing bars 21 and stirrups. The plurality of steel cage main bars 20 are welded one by one with the plurality of reinforcing bars 21 to form a steel cage-like structure; both ends of the steel cage main bars 20 are provided with threaded wire heads, wherein one end is a long thread wire head and the other end is a short thread wire head. The length of the short thread wire head is equal to the internal thread depth of the first internal screw sleeve 11, and the length of the long thread wire head is equal to the sum of the internal thread depth of the second internal screw sleeve 12 and the thickness of the lock nut 12. The diameter, length and accuracy of the long thread wire head and the short thread wire head are checked and controlled with a through-ring gauge, a stop ring gauge and a length card ruler. After passing the self-inspection, a steel wire head protective cap is added;

[0071] Step 2: bend and weld the reinforcement rib 21. The reinforcement rib 21 can be cut, bent, and welded on a cutting, bending, and welding machine, or cut, bent, and welded in steps using a cutting machine and an arc bending machine.

[0072] Step three, forming and processing the first section of the steel cage, using the fixed support steel plate table mold 3 to fix the support at both ends of the main reinforcement 20 of the steel cage, the fixed support steel plate table mold 3 is plugged into the mounting seat 6, or the fixed disk and the movable disk of the steel cage roll welding machine are fixed and supported one by one, or the steel cage roll welding production line is used for automatic axial positioning, and the main reinforcement 20 of the steel cage is welded or tied with multiple reinforcement 21 to form the first section of the steel cage; after the main reinforcement and reinforcement 21 of the first section of the steel cage are welded or tied to form, the steel cage winding machine, the steel cage roll welding machine or the steel cage reinforcement roll welding production line is used to carry out stirrup winding, welding or tying; the stirrups in the joint connection section are wound together for several circles, reserved and stored at both ends of the steel cage without welding, and the several circles of stirrups that are wound together are opened and welded or tied with the main reinforcement 20 of the steel cage after the on-site steel cage segment 2 is docked, and the lap welding between the stirrups is carried out;

[0073] The plurality of main reinforcement bars 20 of the reinforcement cage include a plurality of first reinforcement bars 200 and a plurality of second reinforcement bars 201. The first reinforcement bars 200 and the second reinforcement bars 201 are evenly spaced around the outer circumference of the reinforcement bar 21. The length of the first reinforcement bars 200 and the axial position of the second reinforcement bars 201 are offset by no less than thirty-five times the nominal diameter of the reinforcement bars. To increase the rigidity of the reinforcement cage segment 2 during transportation and installation, auxiliary main bars are provided to the plurality of main reinforcement bars 20 of the reinforcement cage. An auxiliary main bar is connected to one end of the first reinforcement bar 200 or one end of the second reinforcement bar 201 via a connecting sleeve 1 so that the ends of the first reinforcement bar 200 and the second reinforcement bar 201 are flush.

[0074] Step 4: Forming and processing the second section of the steel cage. Use the first section of the steel cage to make a template. Form and process the second section of the steel cage according to step 3. Then, mark one of the main reinforcement bars 20 of the steel cage corresponding to the first section of the steel cage and the second section of the steel cage.

[0075] Step 5: forming and processing the remaining steel cage segments 2, repeating step 4, forming and processing the remaining steel cage segments 2 in sequence;

[0076] Step 6: Check the forming quality of the steel cage segment 2. The forming quality of the steel cage segment 2 is subject to self-inspection and random inspection by the quality inspector according to the quality of the hidden steel bar engineering of the steel bar sub-project. The quality of the forming processing of the steel cage segment 2 is first self-inspected. On the basis of passing the self-inspection, the quality inspector will conduct random inspection. After passing the inspection, the adjacent steel cage segments 2 will be prepared for transportation in sequence. Before transportation, a fixed support steel plate table mold 3 is installed at both ends of the steel cage segment 2.

[0077] In this example, the mounting base 6 includes a base 60, a support 61 and a mounting shaft 62 from bottom to top, and the mounting shaft 62 is cantilevered and mounted on the top of the support 61;

[0078] The fixed support steel plate table formwork 3 includes a support steel plate ring frame 30, multiple ribs 31 and a connecting sleeve 32. The support steel plate ring frame 30 is in the shape of a circular ring with multiple connecting holes. Multiple connecting holes are evenly spaced on the support steel plate ring frame 30. The threaded heads of multiple main reinforcement cage bars 20 are fixed at the connecting holes through upper and lower lock nuts. The multiple ribs 31 are vertically and radially distributed around the connecting sleeve 32. The connecting sleeve 32 is adapted to the installation shaft 62. The lifting ring 7 is detachably mounted in the connecting sleeve 32 through a pin shaft.

[0079] Step seven, hoisting the first segment of the steel cage. After the steel cage segment 2 is transported to the installation site, the main and auxiliary hooks of the automobile crane or self-propelled crane are used to lift the first segment of the steel cage, and the deadweight of the first segment of the steel cage is used to gradually make it vertical or horizontal; a lifting ring 7 is installed on the fixed support steel plate table mold 3 installed on the long threaded end of the first segment of the steel cage, and the lifting ring 7 and the main hook of the lifting equipment are used as the main lifting points. The short threaded end of the first segment of the steel cage is used to use the fixed support steel plate table mold 3 and the auxiliary hook of the lifting equipment as the auxiliary lifting point for combined horizontal lifting, and the deadweight of the first segment of the steel cage is gradually made vertical or horizontal; the lower end of the first segment of the steel cage in the vertical state, i.e., the short screw The fixed support steel plate table formwork 3 and multiple auxiliary main bars at the thread end, or the fixed support steel plate table formwork 3 and multiple auxiliary main bars at the connecting end of the horizontal beam reinforcement cage, or the fixed support steel plate table formwork 3 and multiple auxiliary main bars are removed on the ground before lifting, and the first segment of the reinforcement cage in the vertical state is lowered into the pile hole or the installation position of the beam reinforcement cage until the pile cage has a certain installation height remaining. The first segment of the reinforcement cage is supported by the pit fixture 4 on the pile hole wellhead cap or by means of the reinforcement bar 21 and the crossbeam support, and the lock nut 14 is installed at one end of the long thread head of the reinforcement cage main bar 20 to the root of the thread, and the second inner screw sleeve 12 is screwed until it is against the end face of the reinforcement cage main bar 20, and the next segment of the reinforcement cage segment 2 is waited for to be docked;

[0080] In this example, the pit mouth fixer 4 includes at least two pit mouth fixers 4 used simultaneously when supporting, and the two fixed cross frames 40 are arranged in a staggered manner to adjust the vertical state of the steel cage segment 2 when docking and the horizontal state of the upper end surface; each pit mouth fixer 4 includes at least one fixed cross frame 40, two screw support legs 401, and two connecting pieces 402; the fixed cross frame 40 includes a cross bar 400, and a screw support leg 401 is connected to each end of the cross bar 400 by a screw so as to be lifted and lowered. The bottom of the screw support leg 401 is a square or circular plate structure; at least two connecting members 402 are provided on the cross bar 400, and the connecting member 402 includes at least one fixed plate 403 and two U-shaped clips 404. The fixed plate 403 is a plate-shaped square structure and is fixedly arranged on one side of the cross bar 400. A U-shaped clip 404 is movably connected to the upper and lower ends of the fixed plate 403 by bolts. The main reinforcement 20 of the steel cage is clamped in the two U-shaped clips 404 arranged in an upper and lower manner;

[0081] Step 8, hoisting the second section of the steel cage, repeating step 7, hoisting the second section of the steel cage in a vertical or horizontal state, positioning and lowering it, and placing the main reinforcement 20 of the steel cage in the position according to the mark on the first section of the steel cage and the second section of the steel cage; before the second section of the steel cage is lowered to be ready for docking with the first section of the steel cage, remove the fixed support steel plate table mold 3 and multiple auxiliary main reinforcements installed at the lower end of the second section of the vertical steel cage, i.e., the short thread end, or the fixed support steel plate table mold 3 and multiple auxiliary main reinforcements installed at the connecting end of the horizontal beam steel cage, or remove the fixed support steel plate table mold 3 and multiple auxiliary main reinforcements on the ground before lifting, or the threaded protective cap of the main reinforcement end of the second section of the steel cage, insert the outer screw sleeve 13 into one end of the short thread head of the main reinforcement 20 of the steel cage, screw the first inner screw sleeve 11 until it is tight against the end face of the main reinforcement 20 of the steel cage, and reach the specified tightening torque value;

[0082] Step nine: Coarsely adjust the position of the first and second segments of the steel cage. When the lower end of the second segment of the steel cage is lowered to the top of the first segment of the steel cage, if the deformation of the main reinforcement 20 of the steel cage exceeds the axial and radial allowable range of the connecting sleeve 1, the second segment of the steel cage needs to be coarsely adjusted.

[0083] When the axis offset is large, find the marked main reinforcement bar 20 and the main reinforcement bar 20 with the largest offset among the multiple main reinforcement bars 20 of the first segment of the reinforcement cage, install the guide 5 at the ends of the marked main reinforcement bar 20 and the main reinforcement bar 20 with the largest offset, and after the guide 5 is installed, lower the second segment of the reinforcement cage. Under the guidance of the guide 5, the main reinforcement bars 20 of the two adjacent reinforcement cage segments 2 are made to correspond to each other, and the second segment of the reinforcement cage is automatically aligned into position by relying on its own weight and the guide 5.

[0084] In this example, the guide 5 includes a first guide flap 50 and a second guide flap 51, which are connected to form a cylindrical shell by a dovetail groove. An internal threaded hole 52 that matches the external thread of the second internal screw sleeve 12 is provided at one end of the cylindrical shell.

[0085] When the distance between the ends of the main reinforcement bars 20 of the steel cage exceeds the maximum adjustment value allowed by the connecting sleeve 1, the connecting sleeve 1 is installed as a tractor at the maximum distance between the ends of the main reinforcement bars 20 of the second section of the steel cage, and the second inner screw sleeve 12 and the outer screw sleeve 13 are screwed and moved to tighten the distance between the ends of the main reinforcement bars 20 of the steel cage, and the distance between the ends of the main reinforcement bars 20 of the second section of the steel cage is adjusted to be within the maximum distance range allowed by the connecting sleeve 1; when the adjustment with one connecting sleeve 1 cannot meet the requirements, the number of connecting sleeves 1 can be appropriately increased;

[0086] Step 10, fine-tune the docking of the first segment of the steel cage and the second segment of the steel cage, first tighten the first inner screw sleeve 11 to the specified torque value, then hang the outer screw sleeve 13 above the first inner screw sleeve 11 with the help of an auxiliary clamp, and continue to lower the second segment of the steel cage; in the process of lowering the second segment of the steel cage, the first inner screw sleeve 11 at the end of the steel cage first contacts the main reinforcement part of the second inner screw sleeve 12, and the second inner screw sleeve 12 is unscrewed to make the tapered seat hole of the second inner screw sleeve 12 stick to the cone column of the first inner screw sleeve 11 Close; then screw the outer screw sleeve 13 so that it is buckled with the outer thread of the second inner screw sleeve 12 and reaches the specified tightening torque value, and finally screw the lock nut 14 so that the lock nut 14 is tightly fitted and locked with the outer side of the second inner screw sleeve 12 and reaches the specified torque value; continue to lower the second section of the steel cage, and when the multiple steel cage main bars 20 of the second section of the steel cage have reached the maximum allowable spacing condition of the connection sleeve 1, they can be buckled one by one or multiple bars at the same time with the installation wrench, and then remove the guide 5;

[0087] After the connection is completed, use a calibrated torque wrench for testing and a caliper for detecting the length of exposed threads to check the installation tightening torque value and the exposed thread length, check the minimum installation tightening torque value between the outer screw sleeve 13 and the second inner screw sleeve 12, the minimum installation tightening torque value between the lock nut 14 and the second inner screw sleeve 12, the exposed thread length between the outer screw sleeve 13 and the second inner screw sleeve 12, and the exposed thread length of the lock nut 14; the minimum installation tightening torque value should not be less than the minimum tightening torque value specified in the standard; the exposed thread length should be within the length range specified in the standard; when the minimum tightening torque value specified in the standard and the maximum exposed thread length allowed after installation are reached, the connection of the connecting sleeve 1 can be determined to be qualified;

[0088] Step 11: After the first and second sections of the steel cage are connected and fixed, and the corresponding main reinforcement bars 20 in the first and second sections of the steel cage are all connected and inspected to be qualified, the stirrups stored in the ends of the steel cage sections 2 are released, and the stirrups are welded or tied to the main reinforcement bars 20 and the two stirrups are overlapped and welded or tied;

[0089] Step 12: Hoist and connect the remaining steel cage segments 2, repeat steps 7 to 11 respectively, lower the connected steel cage segments 2 to the pile cage wellhead pedestal section by section, use the pit fixture 4, or the reinforcement ribs 21 and the crossbeam to support the connected steel cage segments 2, and wait for the docking construction of the next steel cage segment 2 until all the steel cage segments 2 are docked.

[0090] A connecting sleeve used in a construction method for butt-jointing a steel cage guide cone comprises a first inner threaded sleeve 11 connected to the end of a main reinforcement 20 of a steel cage segment 2, and a second inner threaded sleeve 12 connected to the end of the main reinforcement 20 of another steel cage segment 2. The second inner threaded sleeve 12 is locked to the end of the main reinforcement 20 of the steel cage by a lock nut 14. The first inner threaded sleeve 11 and the second inner threaded sleeve 12 are connected by a tapered inner shoulder and a threaded connection through a shrinking through hole of an outer threaded sleeve 13.

[0091] The first internal thread sleeve 11 is a sleeve with different tapered columns at both ends. An internal thread, a thread backing groove and a tapered shoulder block column are sequentially arranged on the inner hole wall of the first internal thread sleeve 11, and the internal thread is a right-hand thread; the second internal thread sleeve 12 is a sleeve with a tapered seat hole at one end, and a thread, a thread backing groove and a shoulder block are sequentially arranged on the inner hole wall and the outer cylindrical wall, wherein the internal thread is a right-hand thread and the thread on the outer wall is a left-hand thread.

[0092] The outer screw sleeve 13 is a sleeve with a narrowed through hole at one end and an internally threaded hole at the other end. The inner threaded hole of the sleeve is partially left-handed and partially has a light hole. A first tapered hole seat is provided inside the narrowed through hole. The first tapered hole seat matches the cone column at one end of the first inner screw sleeve 11. The depth of the inner thread of the outer screw sleeve 13 is no greater than the sum of the length of the outer thread of the second inner screw sleeve 12 and the height of the outer cylinder of the first inner screw sleeve 11. The inner thread of the outer screw sleeve 13 matches the outer thread of the second inner screw sleeve 12. The outer cylinder of the outer screw sleeve 13 is a semicircular hexagonal prism, a hexagon, a dodecagon, or a cylinder.

[0093] The lock nut 14 is a nut, and its rotation direction and pitch are the same as the internal thread of the second internal thread sleeve 12.

[0094] Working principle: The end of the main reinforcement 20 of the steel cage is inserted into the through hole with a narrowed end of the outer screw sleeve 13, and the conical column of the first inner screw sleeve 11 falls into the conical seat hole of the second inner screw sleeve 12. The outer screw sleeve 13, which is sleeved outside the first inner screw sleeve 11, is connected to the outer thread of the second inner screw sleeve 12 through a left-handed thread to realize the connection and locking of the ends of the corresponding two main reinforcement 20 of the two adjacent steel cage segments 2. Finally, the lock nut 14 back-pressure locks the second inner screw sleeve 12 according to the specified tightening torque value.

[0095] The above embodiments are merely some explanations of the concept and implementation of the present invention, and are not intended to limit the same. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A method for butt jointing of steel cage guide cones, characterized in that: The invention relates to a connecting sleeve for use in a construction method for butting a guide cone of a steel cage. The connecting sleeve comprises a first inner screw sleeve (11) connected to an end of a main steel cage bar (20) of a steel cage segment (2), and a second inner screw sleeve (12) connected to an end of a main steel cage bar (20) of another steel cage segment (2). The second inner screw sleeve (12) is locked to the end of the main steel cage bar (20) via a lock nut (14). The first inner screw sleeve (11) and the second inner screw sleeve (12) are connected via an outer screw sleeve (13). The first inner screw sleeve (11) is a sleeve with different cone columns at both ends, and an inner thread is provided on the inner hole wall of the first inner screw sleeve (11); The second inner screw sleeve (12) is a sleeve with a tapered seat hole at one end, and threads are provided on the inner hole wall and the outer cylindrical wall; The outer screw sleeve (13) is a sleeve with a shrinking through hole at one end and an internal threaded hole at the other end. A first tapered hole seat is provided at the inner side of the shrinking through hole. The first tapered hole seat matches the cone column at one end of the first inner screw sleeve (11); the internal thread of the outer screw sleeve (13) matches the external thread of the second inner screw sleeve (12); The lock nut (14) is a nut, and its rotation direction and pitch are the same as the internal thread of the second internal thread sleeve (12); The end of the main reinforcement bar (20) of the steel cage is inserted into the through hole with a narrowed opening of the outer screw sleeve (13), and the cone column of the first inner screw sleeve (11) falls into the cone seat hole of the second inner screw sleeve (12), and the outer screw sleeve (13) which is sleeved outside the first inner screw sleeve (11) is connected with the second inner screw sleeve (12), so as to realize the connection and locking of the end of the corresponding two main reinforcement bars (20) of the two adjacent steel cage segments (2), and finally the second inner screw sleeve (12) is back-pressed and locked by the lock nut (14); The steel cage guide cone docking construction method comprises the following steps: Step 1: Processing the main reinforcement (20) of the steel cage, cutting the main reinforcement (20) of the steel cage to a predetermined length according to the segment length of the designed length of the steel cage, high-precision rolling forming straight threads, flat grinding and chamfering the steel end faces; The steel cage segment (2) has a long thread end at one end and a short thread end at the other end, and is composed of a plurality of steel cage main bars (20), a plurality of reinforcing bars (21) and stirrups. The plurality of steel cage main bars (20) are welded one by one with the plurality of reinforcing bars (21) to form a steel cage structure. Both ends of the steel cage main bars (20) are provided with threaded wire heads, wherein one end is a long threaded wire head and the other end is a short threaded wire head. After passing the self-inspection, a steel wire head protective cap is added. Step 2: bend and weld the reinforcing rib (21), and perform cutting, rounding, and welding of the reinforcing rib (21); Step 3: Forming and processing the first section of the steel cage, using a fixed support steel plate table mold (3) to fix and support the two ends of the steel cage main reinforcement (20), plugging the fixed support steel plate table mold (3) into the mounting seat (6), and welding or tying the steel cage main reinforcement (20) to the plurality of reinforcing ribs (21) one by one to form the first section of the steel cage; After the main reinforcement and reinforcing bars (21) of the first section of the steel cage are welded or tied to form, the stirrups are wound, welded or tied; the stirrups in the joint connection section are wound together for several turns and reserved for storage at both ends of the steel cage without being welded; The plurality of main reinforcement bars (20) of the reinforcement cage include a plurality of first reinforcement bars (200) and a plurality of second reinforcement bars (201), the first reinforcement bars (200) and the second reinforcement bars (201) being evenly spaced on the outer perimeter of the reinforcement bar (21), the length of the first reinforcement bar (200) and the second reinforcement bar (201) being offset from each other in the axial direction by not less than thirty-five times the nominal diameter of the reinforcement bar; an auxiliary main reinforcement bar is connected to one end of the first reinforcement bar (200) or one end of the second reinforcement bar (201) via a connecting sleeve (1) so that the end of the first reinforcement bar (200) and the end of the second reinforcement bar (201) are flush; Step 4: Forming and processing the second section of the steel cage, using the first section of the steel cage to make a template, forming and processing the second section of the steel cage according to step 3, and then making a mark on one of the main reinforcement bars (20) of the steel cage corresponding to the connection between the first section of the steel cage and the second section of the steel cage; Step 5, forming and processing the remaining steel cage segments (2), repeating step 4, forming and processing the remaining steel cage segments (2) in sequence; Step 6, inspection of the forming quality of the steel cage segment (2). The quality of the forming process of the steel cage segment (2) is first self-inspected. If the self-inspection is qualified, the quality inspector will conduct a random inspection. After the inspection is qualified, the adjacent steel cage segments (2) are prepared for transportation in sequence. Before transportation, a fixed support steel plate table mold (3) is installed at both ends of the steel cage segment (2); Step 7: hoisting the first section of the steel cage. After the steel cage section (2) is transported to the installation site, the first section of the steel cage is hoisted and its own weight is used to gradually make it vertical or horizontal. A lifting ring (7) is installed on the fixed support steel plate table form (3) installed on the long thread end of the first segment of the steel cage. The lifting ring (7) and the main hook of the lifting equipment serve as main lifting points. The short thread end of the first segment of the steel cage is lifted horizontally in a combined manner using the fixed support steel plate table form (3) and the auxiliary hook of the lifting equipment as auxiliary lifting points, and the dead weight of the first segment of the steel cage is gradually used to make it vertical or horizontal. Remove the fixed support steel plate table formwork (3) and multiple auxiliary main bars at the lower end of the first segment of the vertical steel cage, i.e., the short thread end, or the fixed support steel plate table formwork (3) and multiple auxiliary main bars at the connecting end of the horizontal beam steel cage, or remove the fixed support steel plate table formwork (3) and multiple auxiliary main bars on the ground before lifting, lower the first segment of the vertical steel cage into the pile hole or the installation position of the beam steel cage until the pile cage has a certain installation height remaining, use the pit head fixture (4) on the pile hole wellhead cap or use the reinforcement bar (21) and the crossbeam support to support the first segment of the steel cage, install the lock nut (14) at the root of the thread at one end of the long thread head of the steel cage main bar (20), screw the second inner screw sleeve (12) until it contacts the end face of the steel cage main bar (20), and wait for the next segment of the steel cage segment (2) to be connected; Step eight, hoisting the second section of the steel cage, repeating step seven, hoisting the second section of the steel cage in a vertical or horizontal state, placing it in a position, and placing it in position according to the marked main reinforcement (20) on the first section of the steel cage and the second section of the steel cage; Before the second section of the steel cage is lowered to prepare for docking with the first section of the steel cage, the fixed support steel plate table formwork (3) and multiple auxiliary main bars installed at the lower end of the second section of the vertical steel cage, i.e., the short thread end, or the fixed support steel plate table formwork (3) and multiple auxiliary main bars installed at the connecting end of the horizontal beam steel cage are dismantled, or before lifting, the fixed support steel plate table formwork (3) and multiple auxiliary main bars, or the threaded protective cap of the main bar end of the second section of the steel cage are dismantled on the ground, and the outer screw sleeve (13) is inserted into one end of the short thread head of the main bar (20) of the steel cage, and the first inner screw sleeve (11) is screwed until it is tightened against the end face of the main bar (20) of the steel cage, and the specified tightening torque value is reached; Step nine, coarsely adjust the position of the first segment of the steel cage and the second segment of the steel cage. When the lower end of the second segment of the steel cage is lowered to the top of the first segment of the steel cage, the deformation of the main reinforcement (20) of the steel cage exceeds the axial and radial allowable range of the connecting sleeve (1), the second segment of the steel cage needs to be coarsely adjusted; When the axis is greatly offset, the marked steel cage main reinforcement (20) and the steel cage main reinforcement (20) with the largest offset are found among the multiple steel cage main reinforcements (20) of the first section of the steel cage, and the guide (5) is installed at the ends of the marked steel cage main reinforcement (20) and the steel cage main reinforcement (20) with the largest offset. After the guide (5) is installed, the second section of the steel cage is lowered. Under the guidance of the guide (5), the steel cage main reinforcements (20) of the two adjacent steel cage sections (2) are made to correspond to each other, and the second section of the steel cage is automatically aligned in place by relying on the deadweight of the second section of the steel cage and the guide (5); When the spacing between the ends of the main reinforcement bars (20) of the steel cage exceeds the maximum adjustment value allowed by the connecting sleeve (1), the connecting sleeve (1) is installed as a tractor at the maximum spacing between the ends of the main reinforcement bars (20) of the steel cage in the second section of the steel cage, and the spacing between the ends of the main reinforcement bars (20) of the steel cage is tightened and adjusted by screwing the second inner screw sleeve (12) and the outer screw sleeve (13), and the spacing at the maximum spacing between the ends of the main reinforcement bars (20) of the steel cage in the second section of the steel cage is adjusted so that it is controlled within the maximum spacing range allowed by the connecting sleeve (1); when the adjustment with one connecting sleeve (1) cannot meet the requirements, the number of connecting sleeves (1) is appropriately increased; Step 10, fine-tuning the docking of the first segment of the steel cage and the second segment of the steel cage, first tightening the first inner screw sleeve (11) to the specified torque value, then hanging the outer screw sleeve (13) above the first inner screw sleeve (11) with the help of an auxiliary clamp, and continuing to lower the second segment of the steel cage; in the process of lowering the second segment of the steel cage, at the end of the steel cage, the first inner screw sleeve (11) first contacts the main reinforcement part of the second inner screw sleeve (12), and the second inner screw sleeve (12) is unscrewed so that the cone seat hole of the second inner screw sleeve (12) is in contact with the cone column of the first inner screw sleeve (11). Close; then screw the outer screw sleeve (13) to make it buckle with the outer thread of the second inner screw sleeve (12) and reach the specified tightening torque value, and finally screw the lock nut (14) so ​​that the lock nut (14) and the outer side of the second inner screw sleeve (12) are tightly fitted and locked, and reach the specified torque value; continue to lower the second section of the steel cage, when the multiple steel cage main bars (20) of the second section of the steel cage all reach the maximum allowable spacing condition of the connection sleeve (1), they can be buckled one by one or multiple bars at the same time with the installation wrench, and then remove the guide (5); After the connection is completed, check the minimum installation tightening torque value between the outer screw sleeve (13) and the second inner screw sleeve (12), the minimum installation tightening torque value between the lock nut (14) and the second inner screw sleeve (12), the exposed thread length between the outer screw sleeve (13) and the second inner screw sleeve (12), and the exposed thread length of the lock nut (14). When the minimum tightening torque value specified in the standard and the maximum exposed thread length allowed after installation are reached, the connection of the connecting sleeve (1) can be determined to be qualified; Step 11: After the first segment of the steel cage and the second segment of the steel cage are connected and fixed, and the corresponding main reinforcement bars (20) in the first segment of the steel cage and the second segment of the steel cage are all connected and inspected to be qualified, the stirrups stored in several circles at the end of the steel cage segment (2) are released, and the stirrups are welded or tied to the main reinforcement bars (20) of the steel cage and the two stirrups are overlapped and welded or tied; In step 12, the remaining steel cage segments (2) are hoisted and connected, and steps 7 to 11 are repeated respectively, and the connected steel cage segments (2) are lowered to the pile cage wellhead pedestal one by one, and the connected steel cage segments (2) are supported by the pit head fixture (4), or the reinforcement (21) and the crossbeam, and the next steel cage segment (2) is waited for to be connected, until all the steel cage segments (2) are connected.

2. The method for connecting a steel cage guide cone to a joint according to claim 1, wherein: The mounting seat (6) comprises, from bottom to top, a base (60), a support (61) and a mounting shaft (62), wherein the mounting shaft (62) is cantilevered and mounted on the top of the support (61).

3. The method for connecting a steel cage guide cone to a joint according to claim 2, wherein: The fixed support steel plate table formwork (3) comprises a support steel plate ring frame (30), a plurality of ribs (31) and a connecting sleeve (32). The support steel plate ring frame (30) is in the shape of a multi-connection hole ring. A plurality of connection holes are evenly spaced on the support steel plate ring frame (30). The threaded heads of a plurality of main reinforcement cage bars (20) are fixed at the connection holes through upper and lower lock nuts. The plurality of ribs (31) are vertically and radially distributed around the connecting sleeve (32). The connecting sleeve (32) is adapted to the installation shaft (62); and the lifting ring (7) is detachably mounted in the connecting sleeve (32).

4. The method for connecting a steel cage guide cone to a joint according to claim 1, wherein: The pit mouth fixer (4) includes at least two pit mouth fixers (4) used simultaneously when supporting, and the two fixed cross frames (40) are arranged in a staggered manner to adjust the vertical state of the steel cage segments (2) when docking and the horizontal state of the upper end surface; each pit mouth fixer (4) includes at least one fixed cross frame (40), two screw support legs (401), and two connecting pieces (402); the fixed cross frame (40) includes a cross bar (400), and a screw support leg (401) is connected to each end of the cross bar (400) by a screw to be lifted and lowered. ), the bottom of the screw support leg (401) is a square or circular plate structure; at least two connecting members (402) are provided on the cross bar (400), and the connecting member (402) includes at least one fixed plate (403) and two U-shaped clips (404), the fixed plate (403) is a plate-shaped square structure, fixedly arranged on one side of the cross bar (400), and a U-shaped clip (404) is movably connected to the upper and lower ends of the fixed plate (403), and the main reinforcement of the steel cage (20) is clamped in the two U-shaped clips (404) arranged in an upper and lower manner.

5. The method for connecting a steel cage guide cone to a joint according to claim 1, wherein: The guide (5) comprises a first guide flap (50) and a second guide flap (51), wherein the first guide flap (50) and the second guide flap (51) are connected to form a cylindrical shell via a dovetail groove, and an internal threaded hole (52) adapted to the external thread of the second internal screw sleeve (12) is provided at one end of the cylindrical shell.

6. The method for connecting a steel cage guide cone to a joint according to claim 1, wherein: The outer cylindrical surface of the outer screw sleeve (13) is a semicircular hexagonal prism, a hexagonal body, a dodecagonal body or a cylinder.

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