Full-scale test device and test method for bearing capacity of girder-free suspended formwork system

Abstract

The invention discloses a girder-free suspended formwork system bearing capacity full-scale test device and test method, and relates to the technical field of underground engineering, the girder-free suspended formwork system bearing capacity full-scale test device comprises a frame column and a frame beam which are connected with each other, the frame beam comprises a lower frame beam and an upper frame beam, and the upper frame beam is provided with a plurality of displacement correction beams; each displacement correction beam is connected with the upper frame beam through a first connecting assembly; a plurality of bearing beams are arranged on the lower frame beam, each bearing beam is connected with the lower frame beam through a second connecting assembly, a test suspended formwork system is connected to the bearing beams, and a safety protection assembly is arranged below the test suspended formwork system. According to the full-scale test device for the bearing capacity of the girder-free suspended formwork system and the test method, which adopt the structure, not only can the full-scale test device be used as a supplement for mechanical analysis of the test suspended formwork system during design of a test suspended formwork scheme, but also the overall stress performance and the stress performance of each part of the test suspended formwork system can be observed more intuitively; the method can be used as an important basis for scheme optimization, construction monitoring and deformation control.

Description

Technical Field

[0001] The invention relates to the technical field of underground engineering, and in particular to a full-scale test device and a test method for the bearing capacity of a main beam-free hanging formwork system. Background Art

[0002] In civil engineering construction, when there are working environment restrictions, such as insufficient ground space or insufficient foundation bearing capacity, which makes it difficult to set up a traditional ground-supported formwork system (such as full-span brackets), hanging formwork technology becomes an efficient and feasible solution, which allows concrete pouring operations to be carried out smoothly without relying on a ground-supported formwork system.

[0003] The hanging formwork technology constructs a working platform specially used for steel bar binding and concrete pouring by hanging the formwork on a specially designed hanging formwork support system. The hanging formwork system generally includes main beams, secondary beams, hangers, main ribs, secondary ribs, formwork, etc. The main ribs, secondary ribs and formwork directly bear the loads of cast-in-place reinforced concrete, construction equipment, construction personnel, etc. The loads are transferred to the main beams and secondary beams through the hangers. The main beams and secondary beams transfer the total construction load to the supports or surrounding load-bearing structures. If there is an available load-bearing structure (such as reinforced concrete slab) on the upper part of the hanging formwork system, the main beam can be omitted and the hangers can be directly fixed to the existing upper load-bearing structure (anchored or mechanically connected) to transfer the load directly to the load-bearing structure through the hangers.

[0004] As there are currently no standard specifications for the selection and design of hanging formwork systems, it is necessary to conduct corresponding mechanical analysis of their stress performance during the formulation of the hanging formwork system design plan. Especially for concrete projects with higher risks, on the premise of mechanical calculation of the hanging formwork system design plan, it is necessary to carry out full-scale tests in combination with the on-site construction plan to evaluate the safety and stability of the hanging formwork system, so as to provide a basis for subsequent design and construction plan optimization, on-site construction monitoring and deformation control. Summary of the invention

[0005] The purpose of the present invention is to provide a full-scale test device and test method for the bearing capacity of a main beam-less hanging formwork system, so as to solve the problems raised in the above-mentioned background technology, so that the upper part of the test hanging formwork system has a usable load-bearing structure, and the hanger can be fixed to the upper load-bearing structure, without setting up main and secondary beams for load transfer. In order to test the bearing capacity of the test hanging formwork system and evaluate the safety of the hanging formwork design scheme, a test method is designed.

[0006] To achieve the above-mentioned purpose, the present invention provides a full-scale test device for the bearing capacity of a main beam-free hanging formwork system, comprising mutually connected frame columns and frame beams, the frame beams comprising a lower frame beam and an upper frame beam, the upper frame beam is provided with a plurality of displacement correction beams, each of the displacement correction beams is connected to the upper frame beam through a first connecting component; the lower frame beam is provided with a plurality of load-bearing beams, each of the load-bearing beams is connected to the lower frame beam through a second connecting component, the load-bearing beams are connected to a test hanging formwork system, and a safety protection component is provided below the test hanging formwork system.

[0007] Preferably, the first connecting assembly includes anchor bolts and a fixing steel plate 1 arranged at both ends of the displacement correction beam, the fixing steel plate 1 is arranged above the displacement correction beam, and the anchor bolts pass through the fixing steel plate 1 and are fixedly connected to the upper frame beam.

[0008] Preferably, the second connecting assembly includes a second fixed steel plate, a U-shaped screw and a fixed angle steel arranged at the end of the load-bearing beam, the fixed angle steel is arranged on the lower surface of the lower frame beam, the second fixed steel plate is arranged above the load-bearing beam, and the U-shaped screw passes through the second fixed steel plate and the fixed angle steel for fixed connection.

[0009] Preferably, the load-bearing beam is formed by a plurality of groups of double-jointed channel steels, each group of double-jointed channel steels is separated by a hoisting gap and are placed back to back; A plurality of bearing beam hanging holes are arranged above the bearing beam.

[0010] Preferably, the displacement correction beam is formed by a plurality of groups of I-beams, each group of the I-beams is provided with a trolley, and an electric hoist is provided between the hanging hole of the trolley and the hanging hole of the load-bearing beam.

[0011] Preferably, the test hanging formwork system includes a hanging rod and a template, the template is provided with main ribs and secondary ribs, one end of the hanging rod is fixedly connected to the main ribs and the secondary ribs, and the other end of the hanging rod passes through the lifting gap and is fixedly connected to the load-bearing beam via a nut and a steel pad.

[0012] Preferably, a plurality of steel bars are fixedly arranged at the deflection measuring points of the main ribs, the secondary ribs and the template.

[0013] Preferably, the safety protection component includes a sand pit, and a plurality of jacks are arranged in the sand pit, and the plurality of jacks are arranged below the test hanging mold system.

[0014] Preferably, an enlarged foundation is provided below the frame column.

[0015] A test method for a full-scale test device for bearing capacity of a main beam-free hanging formwork system comprises the following steps: Step S1, installing the experimental device and the test hanging mold system; Step S2, installing two groups of displacement sensors, the L1 group of sensors is used to measure the deflection of the load-bearing beam, and the L2 group of sensors is used to measure the deflection of the template, the main rib and the secondary rib of the test hanging formwork system; Step S3, conducting a self-bearing capacity test of the test hanging formwork system to determine whether the test hanging formwork system can bear its own gravity load; Step S4, performing a preload test; Step S5, performing a loading test; Step S6, determining the bearing capacity limit state; Step S7, unloading, dismantling the test hanging mold system; Step S8: When the load-bearing capacity of the tested hanging formwork system does not meet the requirements, the number and spacing of the load-bearing beams are re-determined according to the spacing between the hanging rods, and the above steps S1 to S7 are repeated.

[0016] Therefore, the present invention adopts a full-scale test device and test method for the bearing capacity of a main beamless hanging formwork system with the above-mentioned structure, which can not only serve as a supplement to the mechanical analysis of the test hanging formwork system when designing the test hanging formwork scheme, but also can more intuitively observe the overall and component stress performance of the test hanging formwork system. It can serve as an important basis for scheme optimization, construction monitoring and deformation control, thereby improving the safety and reliability of the formwork project.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a test device of a full-scale test device and a test method embodiment of the bearing capacity of a main beam-free hanging formwork system of the present invention; Figure 2 It is a structural schematic diagram of a frame column and a frame beam of a full-scale test device and a test method for the bearing capacity of a main beam-free hanging formwork system of the present invention; Figure 3 It is a structural schematic diagram of a second connection assembly of a full-scale test device and test method for bearing capacity of a main beam-free hanging formwork system of the present invention; Figure 4 It is a structural schematic diagram of a first connecting component of a full-scale test device and test method for the bearing capacity of a main beam-free hanging formwork system of the present invention; Figure 5 It is a structural schematic diagram of a safety protection component of a full-scale test device and test method for the bearing capacity of a main beam-free hanging formwork system of the present invention; Figure 6A schematic diagram of the structure and connection of steel bars of a full-scale test device and test method for the bearing capacity of a main beam-free hanging formwork system according to the present invention; Figure 7 It is a schematic diagram of the assembly structure of a test device and a test hanging formwork system for a full-scale test device and a test method for the bearing capacity of a main beam-free hanging formwork system of the present invention; Figure numerals: 1. frame column; 2. frame beam; 21. upper frame beam; 22. lower frame beam; 3. load-bearing beam; 4. displacement correction beam; 5. safety protection component; 6. expanded foundation; 7. load-bearing beam hanging hole; 8. fixed steel plate two; 9. U-shaped screw; 10. fixed angle steel; 11. hand trolley; 12. anchor bolt; 13. fixed steel plate one; 14. sand pit; 15. jack; 16. measured deflection member; 17. steel bar; 18. hanger; 19. main rib; 20. template. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0020] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] Example See also Figure 1-7 The present invention provides a full-scale test device for the bearing capacity of a main beam-free hanging formwork system, comprising a frame column 1 and a frame beam 2 connected to each other, such as Figure 2As shown, the frame beam 2 and the frame column 1 are the main bearing structures of the experimental device, and an enlarged foundation 6 is arranged below the frame column 1. The enlarged foundation 6, the frame column 1 and the frame beam 2 are all reinforced concrete structures. The frame beam 2 includes a lower frame beam 22 and an upper frame beam 21, and a plurality of displacement correction beams 4 are arranged on the upper frame beam 21, and each displacement correction beam 4 is connected to the upper frame beam 21 through a first connecting component; a plurality of bearing beams 3 are arranged on the lower frame beam 22, and each bearing beam 3 is connected to the lower frame beam 22 through a second connecting component, and a test hanging formwork system is connected to the bearing beam 3, and a safety protection component 5 is arranged below the test hanging formwork system.

[0022] like Figure 3 As shown, the load-bearing beam 3 is formed by several groups of double-jointed channel steels, and the two ends are fixed on the lower frame beam 22 through the second connecting assembly. The second connecting assembly includes a fixed steel plate 28, a U-shaped screw 9 and a fixed angle steel 10 arranged at the end of the load-bearing beam 3. The fixed angle steel 10 is arranged on the lower surface of the lower frame beam 22. The fixed steel plate 28 is arranged above the load-bearing beam 3. The U-shaped screw 9 passes through the fixed steel plate 28 and the fixed angle steel 10 for fixed connection. The number and spacing of the load-bearing beams 3 are determined by the number and spacing of the rows of the suspension rods 18. There is a hoisting gap between each group of double-jointed channel steels and they are placed back to back. It is necessary to ensure that the test suspension rod 18 can pass through the gap. A number of load-bearing beam hanging holes 7 are arranged above the load-bearing beam 3. Five load-bearing beam hanging holes 7 are arranged at the 1 / 6 span, 1 / 3 span, 1 / 2 span, 2 / 3 span, and 5 / 6 span of the load-bearing beam 3. The load-bearing beam hanging holes 7 are used to hang electric hoists.

[0023] like Figure 4 As shown, the displacement correction beam 4 is composed of 5 groups of I-beams, and the two ends are fixed to the upper frame beam 21 through the first connecting assembly. The function of the displacement correction beam 4 is to eliminate the influence of the self-deflection of the load-bearing beam 3 on the test results after being loaded. The first connecting assembly includes anchor bolts 12 and a fixed steel plate 13 arranged at both ends of the displacement correction beam 4. The fixed steel plate 13 is arranged above the displacement correction beam 4, and the anchor bolts 12 pass through the fixed steel plate 13 and are fixedly connected to the upper frame beam 21. The displacement correction beam 4 is perpendicular to the layout direction of the load-bearing beam 3. The positions of the 5 groups of displacement correction beams 4 correspond to the 1 / 6 span, 1 / 3 span, 1 / 2 span, 2 / 3 span, and 5 / 6 span of the load-bearing beam 3, respectively. A trolley 11 is arranged on each group of I-beams. The number and spacing of the trolleys 11 are determined by the number and spacing of the rows of the suspension rods 18. An electric hoist (not shown in the figure) is arranged between the hanging hole of the trolley 11 and the hanging hole 7 of the load-bearing beam.

[0024] The test hanging formwork system includes a hanging rod 18 and a template 20. The template 20 is provided with a plurality of main ribs 19 and a plurality of secondary ribs (not shown in the figure). One end of the hanging rod 18 is fixedly connected to the main ribs 19 and the secondary ribs, and the other end of the hanging rod 18 passes through the hanging gap and is fixedly connected to the load-bearing beam 3 through nuts and steel pads. A plurality of steel bars 17 are fixedly provided at the deflection measuring points of the main ribs 19, the secondary ribs and the template 20.

[0025] like Figure 5 As shown, the safety protection component 5 includes a sand pit 14, in which a plurality of jacks 15 are arranged. The jacks 15 are electric hydraulic jacks. The plurality of jacks 15 are arranged below the test hanging mold system. The function of the sand pit 14 is to provide a buffer for the components that may fall when the test device or the test hanging mold system fails. The jacks 15 are buried below the surface of the sand and soil. The top rod is raised during loading and unloading, and the top rod is lowered when measuring readings, as a safety guarantee for the loading and unloading process.

[0026] A test method for a full-scale test device for bearing capacity of a main beam-free hanging formwork system comprises the following steps: The existing subway station transfer stair slab is closely attached to the bottom slab of a new subway station (the net distance between the cast-in-place bottom slab and the existing stair slab is only 5cm). The existing track area is below the stair slab, and the design bearing capacity of the stair slab is much lower than the load during the pouring of the new station bottom slab. Therefore, the bottom slab cannot be poured by setting up a formwork 20 bracket above the existing stair slab. In order not to affect the operation of the existing line, a hanging formwork system needs to be set up above the existing station stair slab to pour the new station bottom slab. 5m above the existing stair slab is the existing station top slab, and the hanger 18 can be implanted into the existing station top slab and anchored as the hanging point of the test hanging formwork system.

[0027] Step S1, install the experimental device and test the hanging mold system. The specific steps are as follows: like Figure 7 As shown, according to the design plan, the row spacing between the suspension rods 18 is determined, and the number and spacing of the load-bearing beams 3 are determined according to the number and spacing of the suspension rods 18, and the number and spacing of the hand-pushing trolleys 11 on the displacement correction beam 4 are determined at the same time. The main ribs 19, secondary ribs, and templates 20 are installed on the surface of the sand pit 14, and the suspension rods 18 are connected to the test hanging mold system according to the design plan. Bolt connection, welding, etc. are selected according to actual conditions, and the test hanging mold system is lifted to a certain height from the surface of the sand pit 14 using the jack 15. The other end of the suspension rod 18 passes through the hoisting gap between the double-jointed channel steels of the load-bearing beam 3, and the protruding end is threaded and fixed to the load-bearing beam 3 through a nut and a steel pad. An electric hoist is installed between the hanging hole 7 of the load-bearing beam and the hanging hole of the hand-pushing trolley 11 of the displacement correction beam 4.

[0028] The preliminary design of the hanging formwork scheme in this embodiment is as follows: the steel formwork 20 is 4mm thick, 6m long and 5m wide; the hanging rod 18 uses Φ25HRB steel bars, and the spacing of the hanging rods 18 in the length direction of the formwork 20 is 1.2m, and the spacing in the width direction is 1m; the main ribs 19 are standard No. 10 I-beams, arranged in parallel length direction, with a spacing of 500mm. According to the number of rows and spacing between the hanging rods 18, 5 load-bearing beams 3 are set, and 5 hand-pushed trolleys 11 are set for each displacement correction beam 4, and pushed to the corresponding position, and the spacing is set to 1m.

[0029] Step S2, install two groups of displacement sensors, the L1 group of sensors is used to measure the deflection of the load-bearing beam 3, and the L2 group of sensors is used to measure the deflection of the template 20, the main rib 19 and the secondary rib of the test hanging formwork system. The specific steps are as follows: The deflection of the test hanging formwork system and the load-bearing beam 3 is measured using LVDT linear displacement sensors, which are arranged directly above the measured component. The LVDT linear displacement sensors are divided into two groups, one of which is used to measure the deflection of the load-bearing beam 3, recorded as the L1 group of sensors; the other group is used to measure the deflection of the template 20, the main rib 19, and the secondary rib in the test hanging formwork system, recorded as the L2 group of sensors. Combined with the mechanical analysis results of the test hanging formwork system, the density of displacement measurement points should be increased in areas with drastic displacement changes or greater risks (mid-span, weak bearing capacity areas, etc.).

[0030] Since the main rib 19, secondary rib and formwork 20 components will be covered during the test simulation concrete pouring, welding can be performed in advance at the deflection measuring point of the deflection component 16 to be measured. Figure 6 The steel bar 17 shown in the figure is used, during the test, to measure the vertical displacement of the steel bar 17 by an LVDT linear displacement sensor instead of the deflection of the above-mentioned components.

[0031] The test hanging formwork system uses strain gauges and combines relevant conversion methods to measure the stress of the hanger rod 18, template 20, main rib 19, and secondary rib in the test hanging formwork system. The density of strain measurement points should be increased in areas with high stress or weak bearing capacity (welded nodes of template 20, stress concentration areas, etc.) in combination with the mechanical analysis results of the hanging formwork system.

[0032] Step S3: Conduct a self-bearing capacity test on the test hanging formwork system to determine whether the test hanging formwork system can bear its own gravity load. The specific steps are as follows: After the installation of the test device, test hanging formwork system and sensors is completed, the on-site test personnel retreat to the safe area and record the initial reading of the L1 group sensor (the displacement sensor reading here refers to the displacement data obtained by converting the displacement sensor voltage signal through calibration data) h0 and the initial reading of the L2 group sensor H0; operate the hydraulic cylinder to retract the push rod to make the hanging formwork system suspended in the air. After the displacement sensor and strain readings are stable (load holding time 10 minutes), adjust the deflection of the load-bearing beam 3 through the electric hoist to make the L1 group sensor reading return to the initial reading h0. After the displacement sensor and strain readings are stabilized again (load holding time 10 minutes), record the L2 group sensor reading H1 and the strain measurement point sensor reading, and judge whether the hanging formwork system can bear its own gravity load through the corresponding measured values.

[0033] Step S4: perform a preload test. The specific steps are as follows: Before the formal loading test, the deformation caused by the close cooperation of the components of the test hanging formwork system is observed by piling precast concrete counterweights on the formwork 20. The total weight of the precast concrete counterweights is 0.1G (G is the sum of the loads of reinforced concrete structure, construction personnel, construction machinery, etc. within the construction range of the hanging formwork. At the same time, for the convenience of operation, the weight of steel bars, construction personnel, construction machinery, etc. are converted into corresponding concrete weights).

[0034] Before loading, the jack 15 push rod should be propped up to the bottom of the template 20. After loading is completed, the test personnel retreat to a safe area and operate the hydraulic cylinder to retract the push rod to suspend the test template system. After the LVDT linear displacement sensor and strain readings are stable (load holding time 10 minutes), the deflection of the load-bearing beam 3 is adjusted by the electric hoist to make the L1 group LVDT linear displacement sensor reading return to the initial reading h0. After the LVDT linear displacement sensor and strain readings are stabilized again (load holding time 10 minutes), record the L2 group LVDT linear displacement sensor reading H2 and the LVDT linear displacement sensor reading at the strain measurement point.

[0035] Step S5: Perform a loading test. The specific steps are as follows: Pour concrete according to the structural design plan and construction plan of the hanging formwork construction scope.

[0036] The loading test adopts the method of graded loading. When the total load p s (s is the load level number) When the load has not reached 1G, the additional load Δp for each level s+1 The load application area can be determined by the requirements of layered pouring and local pouring. The measured displacement and stress data are used as the basis for construction monitoring and deformation control during the construction phase. When the total applied load p s After exceeding 1G, in order to determine the safety margin of the experimental hanging mold assembly, press Δp s+1The graded load of =0.2G increases the concrete pouring amount step by step.

[0037] When pouring concrete for each loading test, the top rod of the jack 15 should be lifted to the bottom of the template 20. After the pouring is completed, the test personnel retreat to the safe area and operate the hydraulic cylinder to retract the top rod to make the experimental hanging template assembly suspended in the air. After the LVDT linear displacement sensor and strain readings are stable (load holding time 10min), the deflection of the load beam 3 is adjusted by the electric hoist to make the L1 group LVDT linear displacement sensor reading return to the initial reading h0. After the LVDT linear displacement sensor and strain readings are stabilized again (load holding time 10min), the L2 group LVDT linear displacement sensor reading H is recorded. s+2 And the LVDT linear displacement sensor readings at the strain measurement point.

[0038] Step S6: Determine the ultimate bearing capacity state. The specific steps are as follows: Determination criteria for ultimate bearing capacity state: (1) During the test, if any of the following signs are observed, it can be determined that the structure has reached or exceeded the ultimate bearing capacity state: ① When the load is no longer increasing, the strain value measured by the stress measuring point changes continuously; ② The node weld cracks; ③ The formwork 20 bolts or rivets are sheared off; ④ The main load-bearing bolts are loose and the node plate is deformed; ⑤ The compressive or bending parts are buckled or the whole is unstable.

[0039] (2) If the construction site has requirements for the template 20 deflection, if the relative displacement measured by the displacement sensor is H1-H0, H2-H0 or H s+2 - If H0 exceeds the allowable deflection of the template 20, it is also determined that the template 20 has reached or exceeded the ultimate bearing capacity state.

[0040] When the above-mentioned bearing capacity limit state judgment standard appears during the loading process, the previous load value p is taken s-1 As the ultimate load; when it occurs within the specified load duration, take the average value of the current load value and the previous load value (p s +p s-1 ) / 2 as the ultimate load; when it occurs after the specified load duration, take the load value of this level p s as the ultimate load.

[0041] Step S7: Unloading and dismantling the test hanging mold system. The specific steps are as follows: The jack 15 is operated to continuously raise the top rod to relieve the load on the load beam 3 until the displacement sensor reading of the load beam 3 is close to the initial reading h0, the top fixing bolts of the suspension rod 18 are removed, the concrete is broken in blocks, and then the other components of the experimental suspension formwork assembly are removed.

[0042] Step S8: When the load-bearing capacity of the tested hanging formwork system does not meet the requirements, or when it is necessary to compare and optimize multiple schemes for other reasons such as economic efficiency, the number and spacing of the load-bearing beams 3 can be re-determined according to the row spacing between the hanging rods 18, and the above steps S1 to S7 are repeated.

[0043] Therefore, the present invention adopts a full-scale test device and test method for the bearing capacity of a main beamless hanging formwork system with the above-mentioned structure, which can not only serve as a supplement to the mechanical analysis of the test hanging formwork system when designing the test hanging formwork scheme, but also can more intuitively observe the overall and component stress performance of the test hanging formwork system. It can serve as an important basis for scheme optimization, construction monitoring and deformation control, thereby improving the safety and reliability of the formwork project.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A full-scale test device for the bearing capacity of a main beam-free hanging formwork system, characterized in that: It comprises mutually connected frame columns and frame beams, the frame beams comprise lower frame beams and upper frame beams, the upper frame beams are provided with a plurality of displacement correction beams, each of the displacement correction beams is connected to the upper frame beam via a first connection assembly; the lower frame beams are provided with a plurality of load-bearing beams, each of the load-bearing beams is connected to the lower frame beam via a second connection assembly, the load-bearing beams are connected with a test hanging formwork system, and a safety protection assembly is provided below the test hanging formwork system.

2. A full-scale test device for bearing capacity of a main beam-free hanging formwork system according to claim 1, characterized in that: The first connection assembly includes anchor bolts and a fixing steel plate 1 arranged at both ends of the displacement correction beam. The fixing steel plate 1 is arranged above the displacement correction beam, and the anchor bolts pass through the fixing steel plate 1 and are fixedly connected to the upper frame beam.

3. A full-scale test device for bearing capacity of a main beam-free hanging formwork system according to claim 2, characterized in that: The second connecting assembly includes a second fixed steel plate, a U-shaped screw and a fixed angle steel arranged at the end of the load-bearing beam, the fixed angle steel is arranged on the lower surface of the lower frame beam, the second fixed steel plate is arranged above the load-bearing beam, and the U-shaped screw passes through the second fixed steel plate and the fixed angle steel for fixed connection.

4. A full-scale test device for bearing capacity of a main beam-free hanging formwork system according to claim 3, characterized in that: The load-bearing beam is formed by a plurality of groups of double-jointed channel steels, each group of double-jointed channel steels is separated by a hoisting gap and are placed back to back; A plurality of bearing beam hanging holes are arranged above the bearing beam.

5. A full-scale test device for bearing capacity of a main beam-free hanging formwork system according to claim 4, characterized in that: The displacement correction beam is composed of a plurality of groups of I-beams, each group of the I-beams is provided with a trolley, and an electric hoist is provided between the hanging hole of the trolley and the hanging hole of the load-bearing beam.

6. A full-scale test device for bearing capacity of a main beam-free hanging formwork system according to claim 5, characterized in that: The test hanging formwork system includes a hanging rod and a template, the template is provided with a main rib and a secondary rib, one end of the hanging rod is fixedly connected to the main rib and the secondary rib, and the other end of the hanging rod passes through the hanging gap and is fixedly connected to the load-bearing beam via a nut and a steel pad.

7. A full-scale test device for bearing capacity of a main beam-free hanging formwork system according to claim 6, characterized in that: A plurality of steel bars are fixedly arranged at the deflection measuring points of the main ribs, the secondary ribs and the template.

8. A full-scale test device for bearing capacity of a main beam-free hanging formwork system according to claim 7, characterized in that: The safety protection component comprises a sand pit, in which a plurality of jacks are arranged, and the plurality of jacks are arranged below the test hanging formwork system.

9. A full-scale test device for bearing capacity of a main beam-free hanging formwork system according to claim 8, characterized in that: An enlarged foundation is arranged below the frame column.

10. A test method using a full-scale test device for bearing capacity of a main beam-free hanging formwork system as described in any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1, installing the experimental device and the test hanging mold system; Step S2, installing two groups of displacement sensors, the L1 group of sensors is used to measure the deflection of the load-bearing beam, and the L2 group of sensors is used to measure the deflection of the template, the main rib and the secondary rib of the test hanging formwork system; Step S3, conducting a self-bearing capacity test of the test hanging formwork system to determine whether the test hanging formwork system can bear its own gravity load; Step S4, performing a preload test; Step S5, performing a loading test; Step S6, determining the bearing capacity limit state; Step S7, unloading, dismantling the test hanging mold system; Step S8: When the load-bearing capacity of the tested hanging formwork system does not meet the requirements, the number and spacing of the load-bearing beams are re-determined according to the spacing between the hanging rods, and the above steps S1 to S7 are repeated.

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