A new type of construction elevator top return structure and construction method

Abstract

The present invention discloses a novel construction elevator top-return structure and a construction method thereof, wherein the top-return structure is respectively connected to the basement top plate corresponding to the construction elevator foundation area and the basement bottom plate below the basement top plate; the top-return structure comprises: a cross beam, which is arranged on the basement top plate, and the upper end surface of the cross beam is flush with the upper end surface of the basement top plate, and the lower end surface of the cross beam is flush with the lower end surface of the basement top plate; a first anchor plate, which is pre-embedded and arranged in the intersection area of the cross beam, and the lower end surface of the first anchor plate is exposed at the lower end surface of the cross beam; a second anchor plate, which is pre-embedded and arranged in the basement bottom plate area just below the cross beam, and the upper end surface of the second anchor plate is exposed at the upper end surface of the basement bottom plate; a lattice column, whose upper end surface is welded and fixed to the lower end surface of the first anchor plate, and whose lower end surface is welded and fixed to the upper end surface of the second anchor plate. This scheme saves construction cost and construction period and can speed up the later finishing work under the premise of ensuring construction quality.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a novel construction elevator top return structure and a construction method thereof. Background Art

[0002] In recent years, with the rapid development of my country's economy, the construction of high-rise and super-high-rise buildings has been in full swing. To fully utilize planned building land, the demand for underground space has increased. Underground garages, underground shopping malls, and civil air defense facilities are an indispensable part of high-rise buildings. In construction projects, on-site construction elevator foundations are generally placed on the basement ceiling. Because the weight of the construction elevator and its foundation exceeds the allowable load of the basement ceiling, the construction elevator foundation needs to be back-jacked. This weight is transferred to the structural foundation through the back-jacking structure to ensure the structural safety of the basement floor.

[0003] Traditional construction elevator foundations typically use a full-frame construction method using fasteners and steel pipes. This method is not only slow to install and dismantle, but also requires a large number of steel pipes and consumes a lot of manpower, which greatly increases construction costs. At the same time, the full-frame construction method also occupies a large amount of basement space, which may interfere with other specialized engineering construction and make it difficult to achieve rapid synchronization of construction progress. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to propose a new construction elevator top return structure and construction method thereof which are convenient to construct, occupy little space, have a reliable and stable structure, use little material and are low in cost.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0006] A novel construction elevator roof return structure is provided in a basement. A construction elevator foundation is provided on the basement roof. The roof return structure is connected to the basement roof corresponding to the construction elevator foundation area and the basement floor below the basement roof. The roof return structure includes:

[0007] A cross beam is provided on the basement top plate, wherein the upper end surface of the cross beam is flush with the upper end surface of the basement top plate, and the lower end surface of the cross beam is flush with the lower end surface of the basement top plate;

[0008] A first anchor plate is pre-embedded in the intersection area of the cross beam, and the lower end surface of the first anchor plate is exposed on the lower end surface of the cross beam;

[0009] A second anchor plate is pre-buried in the basement floor area just below the cross beam, with the upper end surface of the second anchor plate exposed on the upper end surface of the basement floor;

[0010] The lattice column has an upper end surface that is welded and fixed to the lower end surface of the first anchor plate, and a lower end surface that is welded and fixed to the upper end surface of the second anchor plate.

[0011] As a possible implementation method, further, a steel skeleton with a rectangular cross-sectional profile is pre-embedded in the cross beam, and the steel skeleton includes surface bars, bottom bars and stirrups, wherein the layout specification of the surface bars is 3C22, the layout specification of the bottom bars is 2C12, and the layout specification of the stirrups is C8@100.

[0012] As a possible implementation manner, further, the lattice column is formed by welding and fixing 16# double-jointed channel steel.

[0013] As a preferred embodiment, this solution also preferably includes:

[0014] A plurality of first reinforcing bolts are arranged around the edge of the first anchor plate and one end of the first reinforcing bolts passes through the first anchor plate and is embedded and fixed in the cross beam;

[0015] A plurality of second reinforcing bolts are arranged around the edge of the second anchor plate and one end of the second reinforcing bolts passes through the second anchor plate and is embedded and fixed in the basement floor;

[0016] Multiple first reinforcement plates, which are right-angled triangular plate structures and are respectively arranged on both sides of the lattice column and the first anchor plate welded fixed end, the right-angled surface corresponding to one of the right-angled sides of the first reinforcement plate is attached to the first anchor plate and welded fixed, and the right-angled surface corresponding to the other right-angled side of the first reinforcement plate is attached to the side surface of the lattice column and welded fixed;

[0017] Multiple second reinforcement plates are right-angled triangular plate structures and are respectively arranged on both sides of the welded fixed end of the lattice column and the second anchor plate. The right-angled surface corresponding to one of the right-angled sides of the second reinforcement plate is attached to the second anchor plate and welded fixed, and the right-angled surface corresponding to the other right-angled side of the second reinforcement plate is attached to the side of the lattice column and welded fixed.

[0018] As a preferred embodiment, preferably, the lower end face of the second anchor plate is also provided with a reinforcing plate with a cross-shaped outline, the height of the reinforcing plate is less than the thickness of the basement floor, and a plurality of through holes are provided at intervals on the reinforcing plate, the aperture of the through holes is greater than 5 mm and less than 15 mm.

[0019] As a preferred embodiment, preferably, the thickness of the basement top plate is 300 mm;

[0020] The length, width and thickness of the first anchor plate and the second anchor plate are both 250×250×20mm;

[0021] The cross beam is composed of a pair of load-bearing beams crossing each other in the middle, and the length, width and thickness specifications of one of the load-bearing beams are 1200×240×300mm.

[0022] As a preferred embodiment, the lattice column is preferably a rectangular frame structure formed by welding and fixing 16# double-jointed channel steel;

[0023] The lower end surface of the first anchor plate is further provided with a first positioning frame adapted to the inner wall profile of the upper end of the lattice column. The side surfaces of the first positioning frame are threaded through the lattice column and the first positioning frame in sequence and locked by first locking bolts, thereby fixing the upper end of the lattice column relative to the first positioning frame.

[0024] The upper end surface of the second anchor plate is also provided with a second positioning frame adapted to the inner wall contour of the lower end of the lattice column. The side surfaces of the second positioning frame are threaded through the lattice column and the second positioning frame in sequence through second locking bolts and locked, thereby fixing the lower end of the lattice column relative to the second positioning frame.

[0025] Based on the above-mentioned top-returning structure, the present invention further provides a construction method of a novel construction elevator top-returning structure, which includes the above-mentioned novel construction elevator top-returning structure. The construction method includes the following steps:

[0026] S01. If the basement top slab thickness is less than the preset thickness, it will be supplemented to the preset thickness. At the same time, a pouring space for the hidden beam will be reserved at the corresponding location of the construction elevator foundation.

[0027] S02. Pre-embed a first anchor plate in the center of the construction elevator foundation in the reserved casting space, and simultaneously set up a positioning frame for assisting in the layout of the cross beams, and secure it with anchor bolts;

[0028] S03. Bundle the steel cage for casting the cross beam in the positioning frame, then cast the cross beam according to the corresponding template, so that the cross beam is buried in the basement top slab, and the first anchor plate is pre-buried;

[0029] S04. Pre-embed a second anchor plate in the basement floor area directly below the cross beam;

[0030] S05. Assemble the lattice column, weld and fix the upper end of the lattice column to the first anchor plate, and weld and fix the lower end of the lattice column to the second anchor plate, thereby completing the top-back structure construction.

[0031] As a preferred embodiment, preferably, a number of steel fibers are embedded in the side walls of the casting space reserved for laying hidden beams, wherein the steel fibers are embedded before the initial setting of the basement roof, and the steel fibers exposed in the casting space for laying hidden beams are wavy; in addition, the side walls of the casting space reserved for laying hidden beams are also roughened.

[0032] As a preferred embodiment, the lattice column is preferably assembled on site, and the assembly method is as follows:

[0033] (1) Lock and fix the two ends of one channel steel to the first positioning frame of the first anchor plate and the second positioning frame of the second anchor plate respectively;

[0034] (2) Lock and fix the two ends of the other channel steel to the first positioning frame of the first anchor plate and the second positioning frame of the second anchor plate respectively;

[0035] (3) The two channel steels are welded and fixed to form a lattice column, and then the two ends of the two channel steels are welded and fixed to the first anchor plate and the second anchor plate respectively to complete the welding and fixing of the two ends of the lattice column.

[0036] By adopting the above-mentioned technical solution, the present invention has the following beneficial effects compared with the prior art: this solution utilizes double-jointed channel steel lattice columns as the top return for the construction elevator foundation, optimizes the traditional solution, sets a cross-shaped hidden beam in the construction elevator foundation at the top plate position for reinforcement, and uses 16# double-jointed channel steel as the top return column to form a top return system, avoiding the use of a full-height steel pipe frame to return the top, reducing construction costs, and reducing the area affected by other professional engineering construction. At the same time, it ensures the construction progress and saves construction costs; and the use of double-jointed channel steel lattice columns to return the top of the construction elevator foundation is extremely rare in China. The present invention can effectively transfer the weight of the construction elevator foundation to the structural foundation through the top return structure, ensuring the structural safety of the basement floor. At the same time, the construction process is simple, not only avoiding the full-height return of the steel pipe frame affecting other professional construction work surfaces such as fire protection and HVAC in the basement stage, but also reducing the subsequent basement finishing workload. At the same time, while ensuring the construction quality, it saves construction costs and construction period, and can speed up the later finishing work. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a schematic cross-sectional view of a simplified application implementation structure of Example 1 of the present invention;

[0039] Figure 2 This is one of the schematic diagrams of the implementation structure of Example 1 of the present invention;

[0040] Figure 3 This is one of the simplified schematic diagrams of the construction method of Example 1 of the present invention;

[0041] Figure 4 This is a schematic diagram of the construction effect of a double-layer basement in Example 1 of the present invention;

[0042] Figure 5 This is a schematic cross-sectional view of a simplified application implementation structure of Example 2 of the present invention;

[0043] Figure 6 This is one of the schematic diagrams of the implementation structure of Example 2 of the present invention;

[0044] Figure 7 This is the second schematic diagram of the simplified implementation structure of Example 2 of the present invention;

[0045] Figure 8 This is one of the schematic diagrams of the implementation structure of Example 3 of the present invention;

[0046] Figure 9 This is a schematic cross-sectional view of a simplified application implementation structure of Example 4 of the present invention;

[0047] Figure 10 This is one of the schematic diagrams of the implementation structure of Example 4 of the present invention;

[0048] Figure 11 It is a brief structural diagram of the auxiliary formwork with holes mentioned in the construction method of Example 4 of the present invention. DETAILED DESCRIPTION

[0049] The present invention will be described in further detail below with reference to the accompanying drawings and examples. It is particularly noted that the following examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Similarly, the following examples are only some embodiments of the present invention and are not intended to be exhaustive. All other embodiments obtained by those of ordinary skill in the art without creative effort are intended to fall within the scope of protection of the present invention.

[0050] Example 1

[0051] like Figure 1 or Figure 2 As shown, this embodiment provides a novel construction elevator roof return structure, which is arranged in a basement. A construction elevator foundation is provided on the basement roof 1 of the basement. The roof return structure is respectively connected to the basement roof 1 corresponding to the construction elevator foundation area and the basement floor 2 below the basement roof 1; the roof return structure includes:

[0052] The cross beam 3 is arranged on the basement top plate 1, and the upper end surface of the cross beam 3 is flush with the upper end surface of the basement top plate 1, and the lower end surface of the cross beam 3 is flush with the lower end surface of the basement top plate 1;

[0053] The first anchor plate 4 is pre-buried and arranged in the intersection area of the cross beam 3, and the lower end surface of the first anchor plate 4 is exposed on the lower end surface of the cross beam;

[0054] The second anchor plate 5 is pre-buried in the basement floor 2 area just below the cross beam 3, and the upper end surface of the second anchor plate 5 is exposed on the upper end surface of the basement floor 2;

[0055] The upper end surface of the lattice column 6 is welded and fixed to the lower end surface of the first anchor plate 4 , and the lower end surface of the lattice column 6 is welded and fixed to the upper end surface of the second anchor plate 5 .

[0056] Among them, the cross beam 3 described in this embodiment is pre-embedded with a steel frame with a rectangular cross-sectional profile, and the steel frame includes surface bars, bottom bars and stirrups. The layout specification of the surface bars is 3C22, the layout specification of the bottom bars is 2C12, and the layout specification of the stirrups is C8@100.

[0057] The lattice column described in this embodiment is a rectangular frame structure formed by welding and fixing 16# double-jointed channel steel.

[0058] In addition, in this embodiment, the thickness of the basement top plate 1 is 300 mm; the length, width and thickness specifications of the first anchor plate 4 and the second anchor plate 5 are both 250×250×20 mm; the cross beam 3 is composed of a pair of load-bearing beams crossed in the middle, and the length, width and thickness specifications of one of the load-bearing beams are 1200×240×300 mm.

[0059] Currently, there's no practical engineering experience to draw upon for the use of double-jointed channel steel lattice columns for elevator foundations in domestic construction projects. This patented solution, based on the elevator foundations of the China Resources MixC project, optimizes traditional solutions by reinforcing the elevator foundations with cross-shaped hidden beams at the top plate. Furthermore, 16# double-jointed channel steel columns are used to create a top-return system, eliminating the need for full-height steel pipe trusses. This reduces construction costs and minimizes the impact on other specialized engineering areas. This approach also ensures progress and saves costs.

[0060] Through this return structure, the weight of the construction elevator and its foundation borne by the construction elevator foundation is transferred to the structural foundation (i.e., the basement floor 2) through the return system lattice columns 6 formed by 16# double-jointed channel steel. This new return system can effectively transfer the load borne by the construction elevator foundation on the structural surface of the basement top plate 1 to the structural foundation, which not only ensures construction safety, but also ensures the structural safety of the basement floor.

[0061] exist Figure 1 and Figure 2 Based on the shown Figure 3 Based on the roof-returning structure of this embodiment, the construction method of the roof-returning structure of this embodiment includes the following steps:

[0062] S01. If the thickness of the basement top plate 1 is less than the preset thickness, fill it up to the preset thickness. At the same time, reserve a pouring space for laying the hidden beam (i.e., the cross beam 3) at the corresponding location of the construction elevator foundation;

[0063] S02. Pre-embed the first anchor plate 4 in the center of the construction elevator foundation position in the reserved casting space, and set a positioning frame 7 for assisting in the layout of the cross beam 3, and fix it with anchor bolts;

[0064] S03, tying the steel cage for casting the cross beam 3 in the positioning frame, and then casting according to the corresponding template, so that the cross beam is buried in the basement top plate 1, and the first anchor plate 4 is pre-buried;

[0065] S04. Pre-embed a second anchor plate 5 in the basement floor 2 area directly below the cross beam 3;

[0066] S05, assembling the lattice column 6, welding and fixing the upper end of the lattice column 6 to the first anchor plate 4, and welding and fixing the lower end of the lattice column 6 to the second anchor plate 5, thereby completing the construction of the roof-returning structure.

[0067] Figure 4 The top-return installation structure of a double-layer basement is shown. Its structure and corresponding installation method are the same as those of the above-mentioned single-layer basement solution, so they will not be repeated.

[0068] Example 2

[0069] like Figures 5 to 7 As shown in FIG1 , this embodiment is substantially the same as embodiment 1, except that, in this embodiment, as a preferred embodiment, the solution of this embodiment further includes:

[0070] A plurality of first reinforcing bolts 41 are arranged around the edge of the first anchor plate 4 and one end of the first reinforcing bolts 41 passes through the first anchor plate 4 and is embedded and fixed in the cross beam 3;

[0071] A plurality of second reinforcing bolts 51 are arranged around the edge of the second anchor plate 5 and one end of the second reinforcing bolts 51 passes through the second anchor plate 5 and is embedded and fixed in the basement floor 2;

[0072] Multiple first reinforcing plates 42 are of right-angled triangular plate structure and are respectively arranged on both sides of the welded fixed end of the lattice column 6 and the first anchor plate 4. The right-angled surface corresponding to one of the right-angled sides of the first reinforcing plate 42 is attached to the first anchor plate 4 and welded fixed, and the right-angled surface corresponding to the other right-angled side of the first reinforcing plate 42 is attached to the side surface of the lattice column 6 and welded fixed;

[0073] Multiple second reinforcement plates 52 are right-angled triangular plate structures and are respectively arranged on both sides of the welded fixed ends of the lattice column 6 and the second anchor plate 5. The right-angled surface corresponding to one of the right-angled sides of the second reinforcement plate 52 is attached to the second anchor plate 5 and welded fixed, and the right-angled surface corresponding to the other right-angled side of the second reinforcement plate 52 is attached to the side surface of the lattice column 6 and welded fixed.

[0074] The rest of the installation structures not mentioned in this embodiment are the same as those in embodiment 1 and will not be described in detail.

[0075] In the construction method of the roof-returning structure, the first reinforcing bolts 41 and the second reinforcing bolts 51 of this embodiment are pre-buried in the cross beam 3 and the basement floor 2 when they are cast.

[0076] In addition, the first reinforcement plate 42 and the second reinforcement plate 52 of the present embodiment are pre-positioned and welded in advance when the two ends of the lattice column 6 are not welded to the first anchor plate 41 and the second anchor plate 51, that is, after the upper end of the lattice column 6 is aligned with the first anchor plate 4, the first reinforcement plate 42 is welded first, and then the upper end edge of the lattice column 6 is welded to the first anchor plate 4, so as to prevent problems such as heat offset caused by the welding process of the lattice column 6, reduce the welding difficulty, improve work efficiency and ensure quality. Similarly, after the lower end of the lattice column 6 is aligned with the second anchor plate 5, the second reinforcement plate 52 is welded first, and then the lower end edge of the lattice column 6 is welded to the second anchor plate 5; the rest of the construction methods of this embodiment are roughly the same as those in Example 1 and will not be repeated here.

[0077] Example 3

[0078] like Figure 8 As shown, this embodiment is substantially the same as embodiment 2, with the difference being that, in this embodiment, as a preferred embodiment, preferably, the lower end surface of the second anchor plate 5 is further provided with a reinforcing plate 53 having a cross-shaped outline, the height of the reinforcing plate 53 being less than the thickness of the basement floor, and a plurality of through holes 531 being spaced apart on the reinforcing plate 53, the aperture of the through hole 531 being greater than 5 mm and less than 15 mm.

[0079] The through holes 531 on the reinforcing plate 53 are mainly used to improve the embedded strength of the second anchor plate 5 to prevent it from shifting or detaching.

[0080] In addition, the structural numbers and the installation method of the return top structure not mentioned in this embodiment are roughly the same as those in Example 2 and will not be repeated here.

[0081] Example 4

[0082] like Figure 9 or Figure 10As shown, this embodiment is substantially the same as the second embodiment, except that, in this embodiment, the lower end surface of the first anchor plate 4 is further provided with a first positioning frame 43 adapted to the inner wall profile of the upper end of the lattice column 6, and the side surfaces of the first positioning frame 43 are threaded through the lattice column 6 and the first positioning frame 43 by first locking bolts 44 in sequence and locked, thereby fixing the upper end of the lattice column 6 relative to the first positioning frame 43;

[0083] The upper end surface of the second anchor plate 5 is further provided with a second positioning frame 55 adapted to the inner wall contour of the lower end of the lattice column 6. The side surfaces of the second positioning frame 55 are threaded through the lattice column 6 and the second positioning frame 55 in sequence and locked by second locking bolts 54, thereby fixing the lower end of the lattice column 6 relative to the second positioning frame 55.

[0084] In the structure of this embodiment, the lattice column 6 is a pair of 16# channel steels welded and assembled on site, or assembly gaps are reserved at both ends thereof and then closed after assembly.

[0085] Based on the above-mentioned roof-returning structure, the construction method of this embodiment includes the following steps:

[0086] S01. If the thickness of the basement top plate 1 is less than the preset thickness, fill it up to the preset thickness. At the same time, reserve a pouring space for laying hidden beams at the corresponding location of the construction elevator foundation.

[0087] S02. Pre-embed the first anchor plate 4 in the center of the construction elevator foundation position in the reserved casting space, and set a positioning frame for assisting in the layout of the cross beam 3, and fix it with anchor bolts;

[0088] S03, tying the steel cage for casting the cross beam in the positioning frame, and then casting according to the corresponding template, so that the cross beam 3 is buried in the basement top plate, and the first anchor plate 4 is pre-buried;

[0089] S04. Pre-embed a second anchor plate 5 in the basement floor area directly below the cross beam 3;

[0090] S05, assembling the lattice column 6, welding and fixing the upper end of the lattice column 6 to the first anchor plate 4, and welding and fixing the lower end of the lattice column 6 to the second anchor plate 5, thereby completing the construction of the roof-returning structure.

[0091] The on-site assembly method for lattice columns is:

[0092] (1) Lock and fix the two ends of one channel steel to the first positioning bracket 43 of the first anchor plate 4 and the second positioning bracket 55 of the second anchor plate 5 respectively;

[0093] (2) Lock and fix the two ends of the other channel steel to the first positioning bracket 43 of the first anchor plate 4 and the second positioning bracket 55 of the second anchor plate 5 respectively;

[0094] (3) The two channel steels are welded and fixed to form a lattice column 6, and then the two ends of the two channel steels are welded and fixed to the first anchor plate 4 and the second anchor plate 5 respectively to complete the welding and fixing of the two ends of the lattice column.

[0095] In order to improve the bonding strength between the cross beam 3 and the basement top plate 1, as a preferred embodiment, preferably, in step S01, a plurality of steel fibers are embedded in the side walls of the casting space reserved for laying the hidden beam. Figure 11 A perforated auxiliary formwork 6 for assisting in the insertion of steel fibers is shown. A number of insertion holes 61 are provided on the perforated auxiliary formwork 6. When the concrete between the basement top plate 1 and the casting space has not completely set, the pre-buried steel fibers are inserted by replacing the formwork, or when installing the formwork, the perforated auxiliary formwork 6 is installed and the steel fibers are inserted, and then the other end face is subjected to a detachable leak-proof treatment, and the steel fibers exposed in the casting space for laying hidden beams are wavy; in addition, the side walls of the casting space reserved for laying hidden beams are also roughened.

[0096] The above descriptions are only some embodiments of the present invention and do not limit the scope of protection of the present invention. Any equivalent device or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A novel construction elevator return roof structure is provided in a basement, wherein a construction elevator foundation is provided on the basement roof of the basement, and the return roof structure is connected to the basement roof corresponding to the construction elevator foundation area and the basement floor below the basement roof; characterized in that: The top-return structure includes: A cross beam is provided on the basement top plate, wherein the upper end surface of the cross beam is flush with the upper end surface of the basement top plate, and the lower end surface of the cross beam is flush with the lower end surface of the basement top plate; A first anchor plate is pre-embedded in the intersection area of the cross beam, and the lower end surface of the first anchor plate is exposed on the lower end surface of the cross beam; A second anchor plate is pre-buried in the basement floor area just below the cross beam, with the upper end surface of the second anchor plate exposed on the upper end surface of the basement floor; a lattice column, the upper end face of which is welded and fixed to the lower end face of the first anchor plate, and the lower end face of which is welded and fixed to the upper end face of the second anchor plate; A plurality of first reinforcing bolts are arranged around the edge of the first anchor plate and one end of the first reinforcing bolts passes through the first anchor plate and is embedded and fixed in the cross beam; A plurality of second reinforcing bolts are arranged around the edge of the second anchor plate and one end of the second reinforcing bolts passes through the second anchor plate and is embedded and fixed in the basement floor; Multiple first reinforcement plates, which are right-angled triangular plate structures and are respectively arranged on both sides of the lattice column and the first anchor plate welded fixed end, the right-angled surface corresponding to one of the right-angled sides of the first reinforcement plate is attached to the first anchor plate and welded fixed, and the right-angled surface corresponding to the other right-angled side of the first reinforcement plate is attached to the side surface of the lattice column and welded fixed; Multiple second reinforcement plates, which are right-angled triangular plate structures and are respectively arranged on both sides of the lattice column and the second anchor plate welded fixed end, the right-angled surface corresponding to one of the right-angled sides of the second reinforcement plate is attached to the second anchor plate and welded fixed, and the right-angled surface corresponding to the other right-angled side of the second reinforcement plate is attached to the side surface of the lattice column and welded fixed; The lower end surface of the first anchor plate is further provided with a first positioning frame adapted to the inner wall profile of the upper end of the lattice column, and the side surfaces of the first positioning frame are threaded through the lattice column and the first positioning frame in sequence and locked by first locking bolts, thereby fixing the upper end of the lattice column relative to the first positioning frame; The upper end surface of the second anchor plate is further provided with a second positioning frame adapted to the inner wall profile of the lower end of the lattice column. The side surfaces of the second positioning frame are threaded through the lattice column and the second positioning frame by second locking bolts in sequence and locked, thereby fixing the lower end of the lattice column relative to the second positioning frame. A plurality of wavy steel fibers are also provided at the junction of the cross beam and the basement top plate, one end of the steel fibers is pre-embedded in the basement top plate, and the other end is inserted into the cross beam; The lower end surface of the second anchor plate is further provided with a reinforcing plate with a cross-shaped outline. The height of the reinforcing plate is less than the thickness of the basement floor, and a plurality of through holes are provided at intervals on the reinforcing plate.

2. A novel construction elevator top return structure as claimed in claim 1, characterized in that: A steel frame with a rectangular cross-section is embedded in the cross beam. The steel frame includes surface bars, bottom bars and stirrups. The surface bars are arranged in a specification of 3C22, the bottom bars are arranged in a specification of 2C12, and the stirrups are arranged in a specification of C8@100.

3. A novel construction elevator top return structure as claimed in claim 1, characterized in that: The lattice columns are formed by welding and fixing 16# double-jointed channel steel.

4. A novel construction elevator top return structure according to any one of claims 1 to 3, characterized in that: The diameter of the through hole is greater than 5 mm and less than 15 mm.

5. A new type of construction elevator top return structure as claimed in claim 4, characterized in that: The thickness of the basement roof is 300 mm; The length, width and thickness of the first anchor plate and the second anchor plate are both 250×250×20mm; The cross beam is composed of a pair of load-bearing beams crossing each other in the middle, and the length, width and thickness specifications of one of the load-bearing beams are 1200×240×300mm.

6. A new construction method for a construction elevator top return structure, characterized in that: It includes the novel construction elevator top return structure as claimed in claim 5, and the construction method includes the following steps: S01. If the basement top slab thickness is less than the preset thickness, it will be supplemented to the preset thickness. At the same time, a pouring space for the hidden beam will be reserved at the corresponding location of the construction elevator foundation. S02. Pre-embed a first anchor plate in the center of the construction elevator foundation in the reserved casting space, and simultaneously set up a positioning frame for assisting in the layout of the cross beams, and secure it with anchor bolts; S03. Bundle the steel cage for casting the cross beam in the positioning frame, then cast the cross beam according to the corresponding template, so that the cross beam is buried in the basement top slab, and the first anchor plate is pre-buried; S04. Pre-embed a second anchor plate in the basement floor area directly below the cross beam; S05. Assemble the lattice column, weld and fix the upper end of the lattice column to the first anchor plate, and weld and fix the lower end of the lattice column to the second anchor plate, thereby completing the top-back structure construction.

7. A construction method for a new type of construction elevator top return structure as claimed in claim 6, characterized in that: A number of steel fibers are embedded in the side walls of the casting space reserved for laying hidden beams. The steel fibers are embedded before the initial setting of the basement roof, and the steel fibers exposed in the casting space for laying hidden beams are wavy. In addition, the side walls of the casting space reserved for laying hidden beams are also roughened.

8. The construction method of a novel construction elevator top return structure according to claim 6, characterized in that: The lattice column is assembled on site, and the assembly method is as follows: (1) Lock and fix the two ends of one channel steel to the first positioning frame of the first anchor plate and the second positioning frame of the second anchor plate respectively; (2) Lock and fix the two ends of the other channel steel to the first positioning frame of the first anchor plate and the second positioning frame of the second anchor plate respectively; (3) The two channel steels are welded and fixed to form a lattice column, and then the two ends of the two channel steels are welded and fixed to the first anchor plate and the second anchor plate respectively to complete the welding and fixing of the two ends of the lattice column.

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