A removable form, adjustable leveling form shell column construction device and its construction method

Abstract

The application relates to the technical field of site device construction, and discloses a construction device and a construction method of a formwork shell column body without formwork dismounting and leveling, which comprises an upper formwork shell column, a bottom formwork shell column, a lower formwork shell column, an adjustable bolt assembly and a supporting system; steel reinforcement cages are arranged in the upper formwork shell column and the lower formwork shell column, and upper to-be-connected steel reinforcements and lower to-be-connected steel reinforcements are arranged in one-to-one correspondence; the bottom formwork shell column is arranged outside the connecting part of the upper formwork shell column and the lower formwork shell column; and the supporting system is connected between the upper formwork shell column, the lower formwork shell column and a base layer. Through cooperation of the adjustable bolt assembly, the split-splicing type bottom formwork shell column and the supporting system, assembly connection, leveling installation and outside enclosing construction of the connecting part of the formwork shell column are realized.

Description

Technical Field

[0001] This invention relates to the field of construction technology for construction site equipment, and more specifically, to a construction device and construction method for a formwork-free, adjustable flat shell column. Background Technology

[0002] With the continuous development of prefabricated buildings, the construction industry has placed higher demands on the industrialization, construction efficiency, connection reliability, and on-site adaptability of vertical component construction. As a crucial load-bearing component in building structures, the construction quality of columns directly affects the overall structural load-bearing capacity, connection stability, and construction progress. Currently, in prefabricated building construction and construction scenarios combining cast-in-place and precast methods, column construction typically requires consideration of multiple stages, including component transportation, on-site installation, rebar connection, formwork erection, and concrete pouring.

[0003] Among the existing column construction methods, a common approach is to use precast columns. While this method can reduce some on-site formwork and binding processes, precast columns are typically large and heavy, placing high demands on machinery, construction sites, and installation accuracy during transportation, hoisting, and on-site transfer. This is especially true when construction sites are limited or hoisting conditions are complex, leading to problems such as inconvenient transportation, difficult hoisting, and easy damage to components.

[0004] On the other hand, existing methods for connecting the upper and lower sections of column reinforcement bars mainly include lap splices, sleeve splices, or grouting splices. In actual construction, these connection methods are typically quite sensitive to the accuracy of pre-embedding, installation, and on-site construction conditions. When there are positional or height errors in the upper and lower sections of reinforcement bars, problems such as difficulty in butt jointing, reduced connection efficiency, and difficulty in controlling the construction accuracy of the connection area can easily arise, thus affecting the construction quality of the column connection area.

[0005] Furthermore, the erection and dismantling of formwork still constitute a significant portion of the workload during column casting. For existing partial formwork or template construction methods, additional reinforcement structures or subsequent formwork removal procedures are typically required, increasing on-site construction steps and labor input, and extending the construction period. Moreover, during formwork removal, the column surface and corners may suffer damage and require substantial repairs, which is detrimental to construction quality control.

[0006] Meanwhile, some existing column construction structures still suffer from problems in on-site assembly, connection positioning, and support correction, such as insufficiently tight coordination between components, reliance on repeated on-site adjustments during installation, and inadequate construction continuity. In particular, the lack of reasonable structural coordination at the connection points between upper and lower components, column bases, and temporary support points during the pouring stage can easily increase the difficulty of construction organization and hinder the improvement of prefabricated construction levels. Summary of the Invention

[0007] In view of this, the present invention proposes a construction device and construction method for a formwork-free, adjustable-level formwork column, which aims to solve the problems existing in the current column construction process, such as inconvenient transportation and hoisting of components, low connection accuracy when connecting upper and lower sections of steel bars, difficulty in leveling the column connection parts, cumbersome formwork construction procedures, and low efficiency of on-site support and correction.

[0008] In one aspect, the present invention proposes a construction device for a formwork-free, adjustable flat shell column, comprising: Upper mold shell column, bottom mold shell column, lower mold shell column, adjustable bolt assembly and support system; The upper formwork column is provided with a steel cage, which includes multiple upper steel bars to be connected arranged along the axial direction of the upper formwork column, and the lower ends of the upper steel bars to be connected extend out of the upper formwork column. The lower formwork column is provided with a steel cage, which includes multiple lower steel bars to be connected arranged along the axial direction of the lower formwork column. The upper ends of the lower steel bars to be connected extend out of the lower formwork column, and the lower steel bars to be connected correspond one-to-one with the upper steel bars to be connected. The adjustable bolt assembly is configured one-to-one with the upper and lower reinforcing bars to be connected. The adjustable bolt assembly includes a positioning nut, an upper connecting nut, a lower connecting nut, and a lower fastening nut. The positioning nut and the upper connecting nut are disposed on the upper reinforcing bar to be connected, and the lower connecting nut and the lower fastening nut are disposed on the lower reinforcing bar to be connected. The upper connecting nut is threaded to the upper reinforcing bar to be connected, and the lower fastening nut is threaded to the lower reinforcing bar to be connected. The lower connecting nut is connected to both the upper connecting nut and the lower fastening nut, for connecting the upper reinforcing bar to be connected and the lower reinforcing bar to be connected. The bottom mold shell column is located outside the connection between the upper mold shell column and the lower mold shell column. The bottom mold shell column includes a first half mold shell and a second half mold shell that are spliced ​​together. The first half mold shell and the second half mold shell are connected by a set of tie bolts. The support system is connected between the upper mold column, the lower mold column, and the base layer.

[0009] Furthermore, the lower end of the upper reinforcing bar to be connected extends out of the upper mold shell column and has external threads on its outer side. The positioning nut and the upper connecting nut are sleeved on the upper reinforcing bar to be connected along the axial direction of the upper reinforcing bar to be connected, and the positioning nut and the upper connecting nut are threadedly connected to the upper reinforcing bar to be connected respectively. The upper end of the lower reinforcing bar to be connected extends out of the lower mold shell column and has external threads on its outer side. The lower connecting nut and the lower fastening nut are sleeved on the lower reinforcing bar to be connected along the axial direction of the lower reinforcing bar to be connected, and the lower fastening nut is threadedly connected to the lower reinforcing bar to be connected.

[0010] Furthermore, the upper connecting nut is provided with internal threads and external threads. The upper connecting nut is threadedly connected to the upper reinforcing bar to be connected through the internal threads. The lower connecting nut is provided with an upper internal thread. The lower connecting nut is sleeved on the lower reinforcing bar to be connected. The upper internal thread of the lower connecting nut is threadedly connected to the external thread of the upper connecting nut.

[0011] Furthermore, the lower part of the lower connecting nut is provided with a reduced diameter area for the lower reinforcing bar to be connected to pass through. The lower fastening nut is threadedly connected to the lower reinforcing bar to be connected and is located below the lower connecting nut. The lower connecting nut moves upward along the lower reinforcing bar to be connected and engages with the external thread of the upper connecting nut until the reduced diameter area abuts against the lower fastening nut.

[0012] Furthermore, the upper end of the lower fastening nut is provided with a limiting protrusion, the lower end of the lower connecting nut is provided with a first interlocking plane, the upper end of the limiting protrusion is provided with a second interlocking plane, and the first interlocking plane and the second interlocking plane are in contact.

[0013] Furthermore, the positioning nut is positioned above the upper connecting nut, and the positioning nut is threadedly connected to the upper reinforcing bar to be connected and abuts against the upper end face of the upper connecting nut, thereby locking the axial position of the upper connecting nut on the upper reinforcing bar to be connected.

[0014] Furthermore, the first half of the mold shell and the second half of the mold shell are spliced ​​together in the vertical direction to form a hollow column structure. Several sets of tie bolts are arranged at intervals in the vertical direction to lock and fix the first half of the mold shell and the second half of the mold shell. A sealing strip is provided at the splice joint of the first half of the mold shell and the second half of the mold shell.

[0015] Furthermore, an L-shaped steel liner is installed on the upper inner side of the first half of the mold shell, and the L-shaped steel liner is arranged along the axial length of the first half of the mold shell. The inner side of the second half of the mold shell does not have an L-shaped steel liner.

[0016] Furthermore, the support system includes anchor bolts, support rods, clamps, and pins. The anchor bolts are fixed to the base layer. The lower end of the support rod is fixed to the base layer by the anchor bolts. The other end of the support rod is connected to the clamp. The clamp is set on the outer periphery of the upper mold column. The clamp has a reserved pin hole, and the pin passes through the reserved pin hole.

[0017] On the other hand, this application also provides a method for constructing a column without formwork removal and with adjustable flat formwork, for realizing the above-mentioned construction device for a column without formwork removal and with adjustable flat formwork, comprising: S1: Roughen the upper concrete contact surface of the lower formwork column, clean the slag and dust, and confirm that the external threads of the upper and lower reinforcing bars to be connected are undamaged and free from rust. S2: Lift the upper formwork column and keep it in the lifted state. Place the positioning nut and the upper connecting nut on the lower end of the upper steel bar to be connected. Screw the upper connecting nut into the external thread of the upper steel bar to be connected, leaving a leveling area. S3: Place the lower connecting nut and the lower fastening nut axially onto the upper end of the lower reinforcing bar to be connected, and tighten the lower fastening nut to the preset position as a limiting base; S4: Use hoisting equipment to slowly lower the upper formwork column to directly above the lower formwork column, so that the upper reinforcing bars to be connected correspond one-to-one with the lower reinforcing bars to be connected; S5: Rotate the upper connecting nut to adjust the height of each upper steel bar to be connected, so as to achieve horizontal balancing of all axial column bars; turn the lower connecting nut upward to engage with the external thread of the upper connecting nut until the bottom of the lower connecting nut with the lower fastening nut; tighten the lower fastening nut so that the interlocking plane of the lower connecting nut is in contact with the interlocking plane of the lower fastening nut, and then tighten the positioning nut to lock the leveling position of the upper connecting nut; S6: A sealing strip is installed at the corresponding position of the splicing seam between the first half mold shell and the second half mold shell. The first half mold shell and the second half mold shell are spliced ​​to the outside of the connection between the upper mold shell column and the lower mold shell column, and locked and fixed by the tie bolt group. S7: Connect the support system between the upper formwork column, the lower formwork column and the base layer, and adjust the length of the support system to calibrate the verticality of the formwork column; S8: Pour concrete into the hollow column formed by the upper molded column, the bottom molded column and the lower molded column; S9: Once the concrete has reached its design strength, remove the support system.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting an upper formwork column, a bottom formwork column, and a lower formwork column, and placing the bottom formwork column outside the connection between the upper and lower formwork columns, an outer enclosure structure can be formed in the connection area of ​​the upper and lower formwork columns, thereby facilitating the overall installation and subsequent construction of the connection part; by setting reinforcing cages in the upper and lower formwork columns respectively, and setting the upper reinforcing bars to be connected and the lower reinforcing bars to be connected one-to-one, a clear connection foundation can be provided for the rebar connection between the upper and lower formwork columns; by setting adjustable bolts... The components are connected to the upper and lower reinforcing bars to be connected using positioning nuts, upper connecting nuts, lower connecting nuts, and lower fastening nuts, respectively. This forms a connection structure between corresponding upper and lower reinforcing bars, facilitating assembly and adjustment of the connection parts. By setting the bottom formwork columns as first and second half-formworks that can be spliced ​​together and connected using tie bolt groups, the assembly and fixation of the outer formwork structure of the connection part is facilitated. A support system connecting the upper formwork columns, lower formwork columns, and the base layer provides external support for the formwork column construction device during installation. Therefore, this construction device has the advantages of a clear structural composition, convenient assembly of connection parts, and easy formation of a complete formwork structure on the outer side of the connection area. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is an overall installation diagram of a formwork-free, adjustable flat mold shell column construction device provided in an embodiment of the present invention; Figure 2 This is a structural breakdown diagram of a formwork-free, adjustable flat mold shell column construction device provided in an embodiment of the present invention; Figure 3 An adjustable bolt construction drawing for an adjustable flat mold shell column construction device that requires no formwork removal, provided in an embodiment of the present invention; Figure 4 This is a detailed structural diagram of the lower large nut of a construction device for an adjustable flat mold shell column that does not require demolding, provided in an embodiment of the present invention. Figure 5 This is a detailed structural diagram of the lower fastening nut of a formwork-free, adjustable flat mold shell column construction device provided in an embodiment of the present invention; Figure 6 This is a detailed structural diagram of a small mold shell column of a construction device for a mold-free, adjustable flat mold shell column provided in an embodiment of the present invention; Figure 7A detailed structural diagram of the support system for a formwork-free, adjustable flat-formwork column construction device provided in an embodiment of the present invention; Figure 8 The flowchart illustrates a construction method for a formwork-free, adjustable flat shell column, as provided in an embodiment of the present invention.

[0020] Among them, 10. Upper formwork column; 11. Upper reinforcing bar to be connected; 20. Bottom formwork column; 21. First half of the formwork; 22. Second half of the formwork; 23. L-shaped steel lining; 24. Tie bolt assembly; 25. Sealing strip; 30. Lower formwork column; 31. Lower reinforcing bar to be connected; 40. Adjustable bolt assembly; 41. Positioning nut; 42. Upper connecting nut; 43. Lower connecting nut; 431. Upper internal thread; 432. Reduction diameter area; 433. First interlocking plane; 44. Lower fastening nut; 441. Limiting protrusion; 442. Second interlocking plane; 443. Internal thread; 50. Support system; 51. Anchor bolt; 52. Support rod; 53. Clamp; 531. Reserved pin hole; 54. Pin. Detailed Implementation

[0021] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] See Figure 1-7 As shown, this application proposes a construction device for a formwork-free, adjustable flat shell column, comprising: Upper mold shell column 10, bottom mold shell column 20, lower mold shell column 30, adjustable bolt assembly 40 and support system 50; The upper formwork column 10 is provided with a steel cage, which includes multiple upper steel bars 11 to be connected arranged along the axial direction of the upper formwork column 10, with the lower ends of the upper steel bars 11 extending out of the upper formwork column 10. The lower formwork column 30 is provided with a steel cage, which includes multiple lower steel bars 31 arranged along the axial direction of the lower formwork column 30. The upper ends of the lower steel bars 31 extend out of the lower formwork column 30, and the lower steel bars 31 and the upper steel bars 11 are arranged in a one-to-one correspondence. The adjustable bolt assembly 40 is provided in a one-to-one correspondence with the upper reinforcing bar 11 and the lower reinforcing bar 31 to be connected. The adjustable bolt assembly 40 includes a positioning nut 41, an upper connecting nut 42, a lower connecting nut 43 and a lower fastening nut 44. The positioning nut 41 and the upper connecting nut 42 are provided on the upper reinforcing bar 11 to be connected, and the lower connecting nut 43 and the lower fastening nut 44 are provided on the lower reinforcing bar 31 to be connected. The upper connecting nut 42 is threaded to the upper reinforcing bar 11 to be connected, and the lower fastening nut 44 is threaded to the lower reinforcing bar 31 to be connected. The lower connecting nut 43 is connected to the upper connecting nut 42 and the lower fastening nut 44 respectively, and is used to connect the upper reinforcing bar 11 to be connected and the lower reinforcing bar 31 to be connected. The bottom mold shell column 20 is located on the outside of the connection between the upper mold shell column 10 and the lower mold shell column 30. The bottom mold shell column 20 includes a first half mold shell 21 and a second half mold shell 22 that are spliced ​​together. The first half mold shell 21 and the second half mold shell 22 are connected by a tie bolt group 24. The support system 50 is connected between the upper mold column 10, the lower mold column 30 and the base layer.

[0023] Specifically, the upper formwork column 10 and the lower formwork column 30 serve as the upper prefabricated formwork structure and the lower existing formwork structure of the column to be assembled, respectively. Both have pre-installed reinforcing cages inside to form an integrated component between the external formwork structure and the internal reinforcing steel. The upper reinforcing steel 11 to be connected extends from the lower end of the upper formwork column 10, and the lower reinforcing steel 31 to be connected extends from the upper end of the lower formwork column 30. They are axially opposite to each other and correspond one-to-one, so as to form corresponding steel connection positions when the upper and lower column sections are joined. Adjustable bolt assemblies 40 are respectively assembled on the corresponding upper reinforcing steel 11 and lower reinforcing steel 31. The positioning nut 41 and the upper connecting nut 42 are located on one side of the upper reinforcing steel 11, and the lower connecting nut 43 and the lower fastening nut 44 are located on one side of the lower reinforcing steel 31. Through the cooperation of the above-mentioned threaded connectors, the connection between the corresponding upper and lower reinforcing steels is realized, while providing a connection foundation for subsequent adjustment of the docking position and installation fixation. The bottom formwork... Column 20 is located on the outside of the connection between the upper formwork column 10 and the lower formwork column 30. Its function is to form the connection area between the upper and lower formwork columns on the outer periphery. The first half of the formwork 21 and the second half of the formwork 22 are spliced ​​together to form the formwork structure outside the connection. The two half of the formwork are connected and fixed by tie bolt group 24 to ensure the structural stability after splicing. The support system 50 is located on the outer support position of the entire column installation part and is connected between the upper formwork column 10, the lower formwork column 30 and the base layer. The base layer refers to the lower foundation part used to bear and support the construction device. It is usually the foundation, bottom plate, floor slab, top surface of ground beam or other lower bearing structure surface that can provide installation support at the column installation position. The support system 50 forms external support and installation constraints for the upper formwork column 10 and the lower formwork column 30 with the help of the base layer, so that the entire formwork column construction device remains stable during the upper and lower connection and subsequent construction.

[0024] In some embodiments of this application, the lower end of the upper reinforcing bar 11 to be connected extends out of the upper mold shell column 10 and is provided with external threads on the outside. The positioning nut 41 and the upper connecting nut 42 are sleeved on the upper reinforcing bar 11 along the axial direction of the upper reinforcing bar 11 to be connected. The positioning nut 41 and the upper connecting nut 42 are threadedly connected to the upper reinforcing bar 11 to be connected. The upper end of the lower reinforcing bar 31 to be connected extends out of the lower mold shell column 30 and is provided with external threads on the outside. The lower connecting nut 43 and the lower fastening nut 44 are sleeved on the lower reinforcing bar 31 along the axial direction of the lower reinforcing bar 31 to be connected. The lower fastening nut 44 is threadedly connected to the lower reinforcing bar 31 to be connected.

[0025] Specifically, the upper reinforcing bar 11 and the lower reinforcing bar 31 are both connecting end reinforcing bars used for butt jointing of upper and lower column sections. The lower end of the upper reinforcing bar 11 extends downward from the bottom of the upper formwork column 10, and the upper end of the lower reinforcing bar 31 extends upward from the top of the lower formwork column 30. External threads are machined on the outer sides of both extended portions to serve as the thread base for assembly and engagement of the connecting parts. The positioning nut 41 and the upper connecting nut 42 are sequentially sleeved on the upper reinforcing bar 11 along its axial direction. Both are connected to the external threads of the upper reinforcing bar 11 through their respective threaded structures, thus being installed at the extended end of the upper reinforcing bar 11. The positioning nut 41 is located above the upper connecting nut 42 and is used to... 2. After adjusting to the corresponding position, axially limit it; the lower connecting nut 43 and the lower fastening nut 44 are sleeved on the lower reinforcing bar 31 to be connected along the axial direction of the lower reinforcing bar 31 to be connected. The lower fastening nut 44 is screwed into the external thread of the lower reinforcing bar 31 to be connected, thereby fixing it in the predetermined position of the lower reinforcing bar 31 to be connected. The lower connecting nut 43 can be assembled on its outer side along the axial direction of the lower reinforcing bar 31 to be connected, and connected with the upper connecting nut 42 located above. By pre-setting the connecting ends of the upper and lower reinforcing bars to be externally threaded, and assembling the corresponding nut-type connectors on their outer sides, the upper mold shell column 10 side and the lower mold shell column 30 side both form a connecting end structure that can be docked, providing an assembly basis for the alignment, connection and leveling of the upper and lower mold shell columns.

[0026] In some embodiments of this application, the upper connecting nut 42 is provided with internal threads and external threads. The upper connecting nut 42 is threadedly connected to the upper reinforcing bar 11 to be connected through the internal threads. The lower connecting nut 43 is provided with an upper internal thread 431. The lower connecting nut 43 is sleeved on the lower reinforcing bar 31 to be connected. The upper internal thread 431 of the lower connecting nut 43 is threadedly connected to the external thread of the upper connecting nut 42.

[0027] Specifically, the upper connecting nut 42 is a connector with both inner and outer threaded structures. Its inner thread engages with the outer thread on the outside of the upper reinforcing bar 11, allowing the upper connecting nut 42 to be installed at the protruding end of the upper reinforcing bar 11 and its assembly position to be adjusted axially along the upper reinforcing bar 11. Its outer thread is located on the outer circumference of the upper connecting nut 42 and is used to form a threaded engagement with the lower connecting nut 43. The lower connecting nut 43 has an internal thread and is fitted axially along the outside of the lower reinforcing bar 31, allowing the lower reinforcing bar 31 to pass through the lower connecting nut 43 and positioning the lower connecting nut 43 at the upper end. The position between the connecting nut 42 and the lower fastening nut 44 is such that, after the upper and lower mold shell columns are aligned, the lower connecting nut 43 is screwed into the outer thread of the upper connecting nut 42 through its upper internal thread 431, thus forming an intermediate connection structure between the upper reinforcing bar 11 and the lower reinforcing bar 31. In other words, one end of the upper connecting nut 42 is threaded to the upper reinforcing bar 11, and the other end is threaded to the lower connecting nut 43 through its external thread. Thus, the upper connecting nut 42 serves both as a connecting part connected to the upper reinforcing bar 11 and as a transitional connecting part that engages with the lower connecting nut 43, providing a structural basis for the connection and subsequent adjustment between the corresponding upper and lower reinforcing bars.

[0028] In some embodiments of this application, the lower connecting nut 43 is provided with a reduced diameter region 432 for the lower reinforcing bar 31 to be connected to pass through. The lower fastening nut 44 is threadedly connected to the lower reinforcing bar 31 and located below the lower connecting nut 43. The lower connecting nut 43 moves upward along the lower reinforcing bar 31 and engages with the external thread of the upper connecting nut 42 until the reduced diameter region 432 abuts against the lower fastening nut 44.

[0029] Specifically, the lower part of the lower connecting nut 43 forms a reduced diameter region 432. The inner diameter of the reduced diameter region 432 is smaller than that of the part of the lower connecting nut 43 with the upper internal thread 431, but still retains space for the lower reinforcing bar 31 to pass through, so that the lower reinforcing bar 31 can be axially inserted into the lower connecting nut 43. The lower fastening nut 44 has an internal thread 443. The lower fastening nut 44 is screwed into the external thread on the outside of the lower reinforcing bar 31 through the internal thread 443 and is located below the lower connecting nut 43, thus forming a lower limiting reference component on the lower reinforcing bar 31. After the upper mold column and the lower mold column are aligned, the lower connecting nut 43 is rotated to move the lower connecting nut 43 upward along the lower reinforcing bar 31. The lower connecting nut 43 moves upward, and its upper internal thread 431 engages with the outer thread of the upper connecting nut 42. As the lower connecting nut 43 continues to move upward, its lower reduced diameter area 432 gradually approaches the lower fastening nut 44 until the reduced diameter area 432 abuts against the lower fastening nut 44. At this time, the axial position of the lower connecting nut 43 on the lower reinforcing bar 31 to be connected is limited. That is to say, during the upward screwing assembly process, the lower connecting nut 43 forms a threaded connection with the upper connecting nut 42 through its upper internal thread 431, and abuts against the lower fastening nut 44 through its lower reduced diameter area 432. This forms an axial positioning relationship between the upper connecting nut 42 and the lower fastening nut 44, providing a structural basis for the stable assembly of subsequent connecting parts.

[0030] In some embodiments of this application, the upper end of the lower fastening nut 44 is provided with a limiting protrusion 441, the lower end of the lower connecting nut 43 is provided with a first interlocking plane 433, the upper end of the limiting protrusion 441 is provided with a second interlocking plane 442, and the first interlocking plane 433 and the second interlocking plane 442 are in contact.

[0031] Specifically, a limiting protrusion 441 is formed at the upper end of the lower fastening nut 44. This limiting protrusion 441 is located on the upper side of the lower fastening nut 44 and extends axially toward the lower connecting nut 43. It is used to form an upper and lower corresponding limiting engagement with the lower connecting nut 43 after the lower connecting nut 43 moves downward to a predetermined position. A first interlocking plane 433 is formed at the lower end of the lower connecting nut 43, and a second interlocking plane 442 is formed at the upper end of the limiting protrusion 441. When the lower connecting nut 43 moves downward along the lower reinforcing bar 31 to be connected and reaches the position to engage with the lower fastening nut 44, the first interlocking plane 433 and the second interlocking plane 442... The two parts fit together so that the lower connecting nut 43 and the lower fastening nut 44 not only form an axial abutment relationship, but also a mutually mating end face contact relationship. The aforementioned limiting protrusion 441 is equivalent to a partial protruding structure set on the upper end of the lower fastening nut 44. Its top forms a second interlocking plane 442 for mating with the lower connecting nut 43, while the first interlocking plane 433 at the lower end of the lower connecting nut 43 serves as its corresponding mating surface. After the two fit together, the lower connecting nut 43 and the lower fastening nut 44 form a relatively clear mating interface at the corresponding positions, providing a structural basis for maintaining the relative positional relationship between the two in the assembled state.

[0032] In some embodiments of this application, the positioning nut 41 is disposed above the upper connecting nut 42. The positioning nut 41 is threadedly connected to the upper reinforcing bar 11 to be connected and abuts against the upper end face of the upper connecting nut 42, thereby locking the axial position of the upper connecting nut 42 on the upper reinforcing bar 11 to be connected.

[0033] Specifically, both the positioning nut 41 and the upper connecting nut 42 are assembled on the protruding end of the upper reinforcing bar 11 to be connected, with the positioning nut 41 located above the upper connecting nut 42. They are sequentially arranged along the axial direction of the upper reinforcing bar 11. The upper connecting nut 42 first engages with the external thread of the upper reinforcing bar 11 through its internal thread to be installed at the corresponding axial position. The positioning nut 41 then screws downwards along the upper reinforcing bar 11, and its lower end face presses against the upper end face of the upper connecting nut 42. When the positioning nut 41 and the upper connecting nut 42 are tightly pressed together, the positioning nut 41... The upper connecting nut 42 is located on the lower side, and the two form an axially adjacent locking relationship on the upper reinforcing bar 11 to be connected, thereby limiting the axial position of the upper connecting nut 42 on the upper reinforcing bar 11 to be connected; that is, the positioning nut 41 itself does not directly participate in the connection between the upper and lower reinforcing bars to be connected, but acts as a locking element set above the upper connecting nut 42. Through the threaded connection with the upper reinforcing bar 11 to be connected and the tight fit with the upper end face of the upper connecting nut 42, the upper connecting nut 42 can maintain a relatively stable assembly state after being adjusted to the predetermined position.

[0034] In some embodiments of this application, the first half-mold shell 21 and the second half-mold shell 22 are spliced ​​together in the vertical direction to form a hollow column structure. Several sets of tie bolt groups 24 are arranged at intervals in the vertical direction for locking and fixing the first half-mold shell 21 and the second half-mold shell 22. A sealing strip 25 is provided at the splice seam of the first half-mold shell 21 and the second half-mold shell 22.

[0035] Specifically, the first half-shell 21 and the second half-shell 22 are two separate mold shell components located on the outside of the connection between the upper mold shell column 10 and the lower mold shell column 30. During installation, they are vertically joined together to form a hollow column structure that covers the outside of the connection. "Vertically joined" means that the first half-shell 21 and the second half-shell 22 extend along the column height and are assembled along their opposite sides to form a complete outer circumferential mold shell. Tie bolt assemblies 24 are located between the first half-shell 21 and the second half-shell 22, spaced vertically at intervals. Several sets of tie bolts 24 are arranged, each set passing through and connecting to corresponding parts of the two halves of the mold shell, to pull and fix the first half of the mold shell 21 and the second half of the mold shell 22 in the direction of mutual approach, so that the bottom mold shell column 20 after splicing maintains a stable combined state; at the same time, a sealing strip 25 is set at the splicing seam formed by splicing the first half of the mold shell 21 and the second half of the mold shell 22. The sealing strip 25 is located between the butt joint edges of the first half of the mold shell 21 and the second half of the mold shell 22 or at the position corresponding to the splicing seam, and is used to seal the splicing seam so that when the two halves of the mold shell are spliced ​​to form a hollow column structure, the connection seam remains closed.

[0036] In some embodiments of this application, an L-shaped steel liner 23 is installed on the upper inner side of the first half of the mold shell 21. The L-shaped steel liner 23 is arranged along the axial length of the first half of the mold shell 21. The inner side of the second half of the mold shell 22 does not have an L-shaped steel liner 23.

[0037] Specifically, the L-shaped steel liner 23 is installed on the upper inner side of the first half-mold shell 21. It is an inner liner component set on one side of the inner wall of the first half-mold shell 21, and it is arranged along the axial length of the first half-mold shell 21, that is, it extends continuously along the height direction of the first half-mold shell 21, so that the L-shaped steel liner 23 forms a continuous inner mating structure in the corresponding axial section of the first half-mold shell 21. Since the L-shaped steel liner 23 has an L-shaped cross-section structure, it can be attached to the two intersecting inner surfaces of the first half-mold shell 21, thereby forming a mating installation relationship with the inner side of the first half-mold shell 21. Furthermore, the L-shaped steel liner 23 is only provided on the upper inner side of the first half of the mold shell 21, while the inner side of the second half of the mold shell 22 is not provided with the L-shaped steel liner 23. That is, the second half of the mold shell 22 only retains the mold shell body structure. This makes the first half of the mold shell 21 and the second half of the mold shell 22 different in their inner structure. The first half of the mold shell 21 with the L-shaped steel liner 23 is located on the corresponding side after being spliced ​​to form the bottom mold shell column 20, while the second half of the mold shell 22 without the L-shaped steel liner 23 is located on the other side. The two work together to form the split mold shell structure on the outer side of the connecting part.

[0038] In some embodiments of this application, the support system 50 includes anchor bolts 51, support rods 52, clamps 53, and pins 54. The anchor bolts 51 are fixed to the base layer. The lower end of the support rod 52 is fixed to the base layer by the anchor bolts 51. The other end of the support rod 52 is connected to the clamps 53. The clamps 53 are disposed on the outer periphery of the upper mold column 10. The clamps 53 are provided with reserved pin holes 531, and the pins 54 are inserted into the reserved pin holes 531.

[0039] Specifically, the support system 50, as a temporary support structure set on the outside of the formwork column construction site, includes anchor bolts 51, support rods 52, clamps 53, and pins 54. The anchor bolts 51 are fixed to the base layer, which is the lower load-bearing foundation of the construction device, typically a foundation, base plate, floor slab, top surface of a ground beam, or other lower structural surface that can provide fixed support at the column installation location. The lower end of the support rod 52 is fixed to the base layer by the anchor bolts 51, providing a stable lower support point for one end of the support rod 52. The other end of the support rod 52 is connected to the clamps 53, thus forming a support connection between the base layer and the outer periphery of the column. The clamps 53 are set on the upper formwork. The outer periphery of the column 10, i.e., the clamp 53, is arranged around or surrounds the corresponding position on the outside of the upper formwork column 10, so as to form an external constraint on the upper formwork column 10 through the connection with the support rod 52. At the same time, the clamp 53 is provided with a reserved pin hole 531, and the pin 54 passes through the reserved pin hole 531, so that after the clamp 53 surrounds the outer periphery of the upper formwork column 10, the corresponding part can be assembled and fixed by means of the pin 54. This makes the clamp 53 and the upper formwork column 10 form a relatively stable circumferential holding relationship, and makes the support rod 52, clamp 53 and base layer form a complete support transmission path, thereby providing a structural foundation for the support positioning of the upper formwork column 10 during installation and construction.

[0040] In another preferred embodiment based on the above embodiments, see [reference] Figure 8 As shown, this embodiment provides a construction method for a formwork-free, adjustable flat shell column, including: S1: Roughen the upper concrete contact surface of the lower formwork column 30, clean the slag and dust, and confirm that the external threads of the upper steel bar 11 and the lower steel bar 31 to be connected are undamaged and free of rust. S2: Lift the upper formwork column 10 and keep it in the lifted state. Place the positioning nut 41 and the upper connecting nut 42 on the lower end of the upper steel bar 11 to be connected. Screw the upper connecting nut 42 into the external thread of the upper steel bar 11 to be connected, leaving a leveling area. S3: The lower connecting nut 43 and the lower fastening nut 44 are sequentially sleeved axially onto the upper end of the lower reinforcing bar 31 to be connected, and the lower fastening nut 44 is tightened to the preset position as a limiting base; S4: The upper formwork column 10 is slowly lowered to the lower formwork column 30 using hoisting equipment, so that the upper steel bars 11 to be connected correspond one-to-one with the lower steel bars 31 to be connected. S5: Rotate the upper connecting nut 42 to adjust the height of each upper steel bar 11 to be connected, so as to achieve horizontal balancing of all axial column bars; turn the lower connecting nut 43 upward to engage with the external thread of the upper connecting nut 42 until the bottom of the lower connecting nut 43 abuts against the lower fastening nut 44; tighten the lower fastening nut 44 so that the interlocking plane of the lower connecting nut 43 fits against the interlocking plane of the lower fastening nut 44, and then tighten the positioning nut 41 to lock the leveling position of the upper connecting nut 42; S6: A sealing strip 25 is set at the corresponding position of the splicing seam of the first half mold shell 21 and the second half mold shell 22. The first half mold shell 21 and the second half mold shell 22 are spliced ​​to the outside of the connection between the upper mold shell column 10 and the lower mold shell column 30, and locked and fixed by the tie bolt group 24. S7: Connect the support system 50 between the upper mold column 10, the lower mold column 30 and the base layer, and adjust the length of the support system 50 to calibrate the verticality of the mold column; S8: Pour concrete into the hollow column formed by the upper molded column 10, the bottom molded column 20 and the lower molded column 30; S9: After the concrete reaches the design strength, remove the support system 50.

[0041] Understandably, by first treating the upper concrete contact surface of the lower formwork column 30 and inspecting the external thread condition of the upper reinforcing bars 11 and lower reinforcing bars 31 to be connected, a better assembly foundation can be provided for the subsequent connection and installation between the upper formwork column 10 and the lower formwork column 30. By pre-assembling the positioning nut 41 and the upper connecting nut 42 on the upper reinforcing bar 11 to be connected, and pre-assembling the lower connecting nut 43 and the lower fastening nut 44 on the lower reinforcing bar 31 to be connected, the upper and lower connecting ends can be relatively complete before hoisting and alignment. The pre-assembled state facilitates subsequent docking operations. By hoisting the upper formwork column 10 directly above the lower formwork column 30, and utilizing the cooperation between the upper connecting nut 42, the lower connecting nut 43, the lower fastening nut 44, and the positioning nut 41, the corresponding rebar connection positions are adjusted and locked, enabling a relatively stable connection between the upper rebar 11 and the lower rebar 31 to be connected. During upward tightening, the lower connecting nut 43 engages with the external thread of the upper connecting nut 42 through its internal thread 431, and through its... The reduced diameter area 432 at the bottom abuts against the lower fastening nut 44. Simultaneously, the first interlocking plane 433 at the lower end of the lower connecting nut 43 fits against the second interlocking plane 442 at the upper end of the lower fastening nut 44, thus facilitating the definition of the assembly position of the connection part. By splicing the first half-mold 21 and the second half-mold 22 on the outside of the connection between the upper mold shell column 10 and the lower mold shell column 30, and using the tie bolt group 24 and sealing strip 25 for locking and sealing, a complete bottom mold shell column 20 structure can be formed on the outside of the connection part. Through the support system... The support system 50 connects the upper formwork column 10, the lower formwork column 30, and the base layer, and adjusts the support system 50 to support and calibrate the installation state of the formwork column. Based on this, by pouring concrete into the hollow column formed by the upper formwork column 10, the bottom formwork column 20, and the lower formwork column 30, and removing the support system 50 after the concrete reaches the design strength, the construction process of the formwork column can be completed. Thus, this construction method has the characteristics of a clear connection and installation sequence, a more complete outer forming of the connection part, and a smoother connection of the construction process.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A construction device for a formwork-free, adjustable flat-formwork column, characterized in that, include: Upper mold shell column, bottom mold shell column, lower mold shell column, adjustable bolt assembly and support system; The upper formwork column is provided with a steel cage, which includes multiple upper steel bars to be connected arranged along the axial direction of the upper formwork column, and the lower ends of the upper steel bars to be connected extend out of the upper formwork column. The lower formwork column is provided with a steel cage, which includes multiple lower steel bars to be connected arranged along the axial direction of the lower formwork column. The upper ends of the lower steel bars to be connected extend out of the lower formwork column, and the lower steel bars to be connected correspond one-to-one with the upper steel bars to be connected. The adjustable bolt assembly is configured one-to-one with the upper and lower reinforcing bars to be connected. The adjustable bolt assembly includes a positioning nut, an upper connecting nut, a lower connecting nut, and a lower fastening nut. The positioning nut and the upper connecting nut are disposed on the upper reinforcing bar to be connected, and the lower connecting nut and the lower fastening nut are disposed on the lower reinforcing bar to be connected. The upper connecting nut is threaded to the upper reinforcing bar to be connected, and the lower fastening nut is threaded to the lower reinforcing bar to be connected. The lower connecting nut is connected to both the upper connecting nut and the lower fastening nut, for connecting the upper reinforcing bar to be connected and the lower reinforcing bar to be connected. The bottom mold shell column is located outside the connection between the upper mold shell column and the lower mold shell column. The bottom mold shell column includes a first half mold shell and a second half mold shell that are spliced ​​together. The first half mold shell and the second half mold shell are connected by a set of tie bolts. The support system is connected between the upper mold column, the lower mold column, and the base layer.

2. The construction device for a formwork-free, adjustable flat-formwork column according to claim 1, characterized in that, The lower end of the upper reinforcing bar to be connected extends out of the upper mold shell column and has external threads on the outside. The positioning nut and the upper connecting nut are sleeved on the upper reinforcing bar to be connected along the axial direction of the upper reinforcing bar to be connected. The positioning nut and the upper connecting nut are threadedly connected to the upper reinforcing bar to be connected. The upper end of the lower reinforcing bar to be connected extends out of the lower mold shell column and has external threads on the outside. The lower connecting nut and the lower fastening nut are sleeved on the lower reinforcing bar to be connected along the axial direction of the lower reinforcing bar to be connected. The lower fastening nut is threadedly connected to the lower reinforcing bar to be connected.

3. The construction device for a formwork-free, adjustable flat shell column according to claim 2, characterized in that, The upper connecting nut has internal and external threads. The upper connecting nut is threadedly connected to the upper reinforcing bar to be connected through the internal thread. The lower connecting nut has an upper internal thread. The lower connecting nut is sleeved on the lower reinforcing bar to be connected. The upper internal thread of the lower connecting nut is threadedly connected to the external thread of the upper connecting nut.

4. The construction device for a formwork-free, adjustable flat-formwork column according to claim 3, characterized in that, The lower part of the lower connecting nut is provided with a reduced diameter area for the lower reinforcing bar to be connected to pass through. The lower fastening nut is threadedly connected to the lower reinforcing bar to be connected and is located below the lower connecting nut. The lower connecting nut moves upward along the lower reinforcing bar to be connected and engages with the external thread of the upper connecting nut until the reduced diameter area abuts against the lower fastening nut.

5. The formwork-free, adjustable flat mold shell column construction device according to claim 4, characterized in that, The upper end of the lower fastening nut is provided with a limiting protrusion, the lower end of the lower connecting nut is provided with a first interlocking plane, and the upper end of the limiting protrusion is provided with a second interlocking plane. The first interlocking plane and the second interlocking plane are in contact with each other.

6. The construction device for a formwork-free, adjustable flat shell column according to claim 5, characterized in that, The positioning nut is positioned above the upper connecting nut. The positioning nut is threadedly connected to the upper reinforcing bar to be connected and abuts against the upper end face of the upper connecting nut, thereby locking the axial position of the upper connecting nut on the upper reinforcing bar to be connected.

7. The construction device for a formwork-free, adjustable flat shell column according to claim 6, characterized in that, The first half of the mold shell and the second half of the mold shell are spliced ​​together in the vertical direction to form a hollow column structure. Several sets of tie bolts are arranged at intervals in the vertical direction to lock and fix the first half of the mold shell and the second half of the mold shell. A sealing strip is provided at the splice joint of the first half of the mold shell and the second half of the mold shell.

8. The formwork-free, adjustable flat mold shell column construction device according to claim 7, characterized in that, An L-shaped steel liner is installed on the upper inner side of the first half of the mold shell, and the L-shaped steel liner is arranged along the axial length of the first half of the mold shell. The inner side of the second half of the mold shell does not have an L-shaped steel liner.

9. The construction device for a formwork-free, adjustable flat-formwork column according to claim 8, characterized in that, The support system includes anchor bolts, support rods, clamps, and pins. The anchor bolts are fixed to the base layer. The lower end of the support rod is fixed to the base layer by the anchor bolts. The other end of the support rod is connected to the clamp. The clamp is set on the outer periphery of the upper mold column. The clamp has a reserved pin hole, and the pin passes through the reserved pin hole.

10. A method for constructing a formwork-free, adjustable flat-formwork column, used to implement the formwork-free, adjustable flat-formwork column construction device as described in any one of claims 1-9, characterized in that, include: S1: Roughen the upper concrete contact surface of the lower formwork column, clean the slag and dust, and confirm that the external threads of the upper and lower reinforcing bars to be connected are undamaged and free from rust. S2: Lift the upper formwork column and keep it in the lifted state. Place the positioning nut and the upper connecting nut on the lower end of the upper steel bar to be connected. Screw the upper connecting nut into the external thread of the upper steel bar to be connected, leaving a leveling area. S3: Place the lower connecting nut and the lower fastening nut axially onto the upper end of the lower reinforcing bar to be connected, and tighten the lower fastening nut to the preset position as a limiting base; S4: Use hoisting equipment to slowly lower the upper formwork column to directly above the lower formwork column, so that the upper reinforcing bars to be connected correspond one-to-one with the lower reinforcing bars to be connected; S5: Rotate the upper connecting nut to adjust the height of each upper steel bar to be connected, so as to achieve horizontal balancing of all axial column bars; turn the lower connecting nut upward to engage with the external thread of the upper connecting nut until the bottom of the lower connecting nut with the lower fastening nut; tighten the lower fastening nut so that the interlocking plane of the lower connecting nut is in contact with the interlocking plane of the lower fastening nut, and then tighten the positioning nut to lock the leveling position of the upper connecting nut; S6: A sealing strip is installed at the corresponding position of the splicing seam between the first half mold shell and the second half mold shell. The first half mold shell and the second half mold shell are spliced ​​to the outside of the connection between the upper mold shell column and the lower mold shell column, and locked and fixed by the tie bolt group. S7: Connect the support system between the upper formwork column, the lower formwork column and the base layer, and adjust the length of the support system to calibrate the verticality of the formwork column; S8: Pour concrete into the hollow column formed by the upper molded column, the bottom molded column and the lower molded column; S9: Once the concrete has reached its design strength, remove the support system.

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