Mounting structure of assembly type dense rib floor system body and construction method of mounting structure

Abstract

The invention belongs to the technical field of constructional engineering, and particularly relates to a mounting structure of an assembly type dense rib floor system body and a construction method thereof.The mounting structure comprises a dense rib prefabricated bottom plate, and the dense rib prefabricated bottom plate is composed of dense rib prefabricated bottom plate ribbed beam overhanging steel bars, dense rib prefabricated bottom plate ribbed beams and dense rib prefabricated bottom plate ribbed beam stirrups; external threads are machined at the ends of the dense rib prefabricated bottom plate ribbed beam overhanging steel bars, and the two dense rib prefabricated bottom plate ribbed beam overhanging steel bars are connected through a steel bar connector; according to the steel bar connector, when the prefabricated parts are connected, the steel bars do not need to be rotated, only the pre-tightening bolts need to be installed in the bolt holes reserved in the upper connector and the lower connector, the pre-tightening force needs to be applied, and therefore reliable thread pair connection is formed between the internal threads of the upper connector and the lower connector and the external threads of the steel bars of the prefabricated parts; the connection mode is not affected by the construction environment, installation is convenient, connection is reliable, and cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering, and in particular relates to an installation structure of an assembled multi-ribbed floor and a construction method thereof. Background Art

[0002] Prefabricated concrete structures are mostly built with prefabricated reinforced concrete components using industrialized technology. They have many advantages such as excellent quality, short construction period, energy saving, reduced consumption, and clean production. Prefabricated reinforced concrete components are prefabricated in factories and connected to form a whole through connectors on site. Therefore, the steel connection of prefabricated concrete structures is the key to structural safety, and the construction technology of steel connection also has a great impact on construction quality and installation efficiency. The industry standard "Technical Code for Prefabricated Concrete Structures" (JGJ 1-2014, hereinafter referred to as "Code") points out: "The key to the success or failure of prefabricated structures lies in the connection technology between prefabricated components, and between prefabricated components and cast-in-place and post-cast concrete, including the selection of connection joints and the structural design of connection nodes", "The connection technology of prefabricated components is the key and core technology of prefabricated structures." Compared with ordinary floor slabs, dense rib floor slabs are a kind of floor slab structure with good force and economic performance, convenient and fast construction, wide application range, light weight, and small seismic action. In recent years, the country has vigorously promoted the engineering application of prefabricated buildings, and the whole cast dense rib floor slabs have also been continuously developing in the direction of prefabricated dense rib floor slabs. Prefabricated multi-ribbed floor also belongs to prefabricated concrete structure. Therefore, the connection of rib beam steel bars in prefabricated multi-ribbed floor is crucial to the safety of the overall building structure. In addition, how to improve the assembly rate of prefabricated multi-ribbed floor and reduce the use of formwork is also a key issue.

[0003] At present, the mainstream connection methods of prefabricated components in the construction industry mainly include welding, binding connection, grouting sleeve connection, extrusion sleeve connection, straight thread sleeve connection, etc. In the actual construction process, they still have the following problems:

[0004] 1. Steel bar welding requires special construction equipment, materials and electricity, and has high requirements for power supply. It has strict requirements for construction personnel and construction environment, poor quality controllability, and a high probability of defective products.

[0005] 2. The steel bar binding connection needs to be overlapped, which requires a large amount of steel bars and has poor force transmission performance. In addition, the overlap of steel bar binding will occupy the area of ​​the component and may affect the concrete pouring.

[0006] 3. Grouting sleeve joints are expensive, complicated to operate, and difficult to detect. The grouting sleeve connection operation procedures are complex and require high professionalism. There are many links and factors that affect the quality during construction, and they are difficult to avoid and control. In addition, the grouting construction is significantly affected by the ambient temperature, which limits the construction area and season. The grouting material must be used up within 30 minutes after adding water, and it can only be discarded after the timeout.

[0007] 4. The traditional steel bar straight threaded sleeve joint is not suitable for connecting the longitudinal reinforcement of prefabricated components and the longitudinal reinforcement of the formed steel bar skeleton because the steel bar needs to be rotated to connect the steel bar.

[0008] 5. Since the width and depth of the extrusion indentation of the cold-extruded sleeve joint are difficult to control during on-site operation, there are hidden dangers in the quality of the steel bar connection.

[0009] In summary, how to achieve reliable connection between the steel bars of a formed steel skeleton or precast concrete components similar to an assembled multi-rib floor structure, while reducing the use of formwork and improving the assembly rate, and making the connection method unaffected by the construction environment, easy to operate, economical and environmentally friendly, is a technical problem that needs to be urgently solved by technicians in this field. Summary of the invention

[0010] The purpose of the present invention is to provide an installation structure of an assembled multi-ribbed floor and a construction method thereof, so as to solve the problems raised in the background technology.

[0011] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0012] An installation structure of an assembled multi-ribbed floor, comprising a multi-ribbed prefabricated floor 00, wherein the multi-ribbed prefabricated floor 00 is composed of multi-ribbed prefabricated floor rib beam extended steel bars 001, multi-ribbed prefabricated floor rib beam 002, and multi-ribbed prefabricated floor rib beam stirrups 003, wherein the ends of the multi-ribbed prefabricated floor rib beam extended steel bars 001 are processed with external threads, and two multi-ribbed prefabricated floor rib beam extended steel bars 001 are connected by a steel bar connector;

[0013] The steel bar connector is composed of an upper connector 11, a lower connector 12, a pre-tightening bolt 13, and a pre-tightening nut 14. The upper connector 11 and the lower connector 12 are both provided with internal threads matching the external threads of the protruding steel bars 001 of the dense-ribbed prefabricated bottom plate rib beam, and the internal threads are triangular threads. The upper connector 11 is provided with an upper bolt hole 111, and the lower connector 12 is provided with a lower bolt hole 121. The pre-tightening bolt 13 passes through the upper bolt hole 111 and the lower bolt hole 121 and is connected to the pre-tightening nut 14.

[0014] A method for constructing an assembled multi-ribbed floor body, using the installation structure of the assembled multi-ribbed floor body to carry out construction, comprising the following steps:

[0015] Step 1: Lay the prefabricated ribbed bottom plate with ribbed beams and threaded protruding steel bars on the supporting structure at the bottom of the plate in sequence;

[0016] Step 2: Place the prefabricated steel cage without support formwork at the joint of two opposite prefabricated ribbed bottom plates;

[0017] Step 3, butting the new radial split steel bar connector with the protruding steel bars of the dense-rib prefabricated bottom plate rib beam to form a reliable threaded pair connection structure;

[0018] Step 4: Install the plastic cavity shell in the reserved space on the upper part of the dense-rib prefabricated bottom plate;

[0019] Step 5, tying the upper steel bars of the dense-ribbed prefabricated bottom plate rib beam and laying the steel mesh;

[0020] Step 6: pour concrete. After the concrete dries and solidifies, it forms an integral force-bearing structure together with the prefabricated steel cage, the prefabricated ribbed bottom plate, the hollow plastic shell, the steel mesh and other components.

[0021] The laying of the multi-ribbed prefabricated baseboard in step 1 specifically includes the following steps:

[0022] Step 1-1, during the processing and production of the multi-ribbed prefabricated base plate, the ends of the protruding steel bars of the rib beams of the multi-ribbed base plate should be stripped and threaded to facilitate the subsequent reliable connection with the steel bar connector;

[0023] Step 1-2: When laying the multi-ribbed precast slab, the outrigger rib beam reinforcements of two opposing precast multi-ribbed slabs should be aligned accordingly and ensure top contact.

[0024] The specific placement steps in step 2 are:

[0025] Step 2-1, the prefabricated steel cage without formwork includes a steel cage frame, a thin steel plate at the bottom of the steel cage, prefabricated steel cage stirrups, and prefabricated steel cage stress bars;

[0026] Step 2-2: After the rib beams of two corresponding precast multi-ribbed bottom plates have their protruding steel bars connected to the steel bar connectors, the precast steel cage without support formwork is placed on the supporting structure at the joint of the two corresponding precast multi-ribbed bottom plates.

[0027] The specific steps of butt jointing the extended steel bars in step 3 are as follows:

[0028] Step 3-1, splice and install the upper connector and the lower connector with the end of the protruding steel bar of the prefabricated multi-ribbed floor rib beam, so that the internal threads of the upper and lower connectors and the external threads of the end of the protruding steel bar of the prefabricated multi-ribbed floor rib beam form a reliable thread pair connection;

[0029] Step 3-2: Install pre-tightening bolts at the bolt holes reserved in the upper and lower connectors, and apply pre-tightening force to the pre-tightening bolts to make the upper connector and the lower connector fit tightly at the contact surface.

[0030] The specific steps for installing the plastic cavity shell in step 4 are as follows:

[0031] Step 4-1, place the customized fully enclosed standardized plastic cavity shell in the reserved space on the upper part of the dense-rib prefabricated bottom plate in sequence;

[0032] Step 4-2: After the plastic cavity shells are installed, level the tops thereof to ensure that all the plastic cavity shells are approximately at the same height.

[0033] The specific steps of step 5 of tying the upper steel bars of the dense-ribbed prefabricated bottom plate rib beam and laying the steel mesh are as follows:

[0034] Step 5-1, tie the transverse and longitudinal stress-bearing steel bars on the upper part of the prefabricated bottom plate rib beam respectively;

[0035] Step 5-2: Lay the steel mesh on the prefabricated steel cage, the prefabricated ribbed bottom plate, the leveled standard cavity plastic shell and other components that have been installed;

[0036] Step 5-3: Locally increase the density of the steel mesh above the joints of the two dense-ribbed precast bottom plates.

[0037] The specific pouring steps in step 6 are:

[0038] Step 6-1, the thin steel plate at the bottom of the prefabricated steel cage at the joint of the dense-ribbed prefabricated bottom plate is used as a template when pouring concrete;

[0039] Step 6-2: Arrange a small aluminum formwork at the intersection of the four prefabricated ribbed bottom slab rib beams, and use it together with the thin steel plate at the bottom of the prefabricated steel cage as a formwork for pouring concrete;

[0040] Step 6-3: After the concrete is poured, it should be cured in accordance with relevant regulations.

[0041] The steel bar connector adopted by the present invention does not need to rotate the steel bars when connecting prefabricated components. It only needs to install pre-tightening bolts at the bolt holes reserved in the upper and lower connectors and apply pre-tightening force to form a reliable threaded pair connection between the internal threads of the upper and lower connectors and the external threads of the steel bars of the prefabricated components. The connection method is not affected by the construction environment, is easy to install, has reliable connection and low cost.

[0042] The radial split steel bar connector uses a threaded structure to withstand axial tension, which will inevitably produce a large radial component force. Compared with the existing axially split steel bar sleeves, the steel bar connector used in the present invention has lower requirements for the centering of the steel bars, can allow a larger construction error, and has obvious advantages in the force transmission method. The steel bar connector uses four bolts to counteract the radial component force generated when the threaded structure is subjected to axial tension. Compared with the existing radially split steel bar sleeves, this method is simple to process, convenient to construct, and reliable in connection.

[0043] The prefabricated steel cage with free formwork is used at the joints of the dense ribbed prefabricated bottom plate. The lower part of the prefabricated steel cage with free formwork is welded with a thin steel plate, which can be used as a formwork during the construction stage and can be directly used as part of the main structure during the use stage. It can improve the assembly rate and greatly reduce the use of formwork, shorten the construction period and is economical and environmentally friendly.

[0044] During construction, it is not affected by the construction environment and there is no open flame operation scene. The installation operation procedures of the new radial split steel bar connector and the prefabricated steel bar cage without support formwork at the joints are simple and do not require high professional skills from the construction personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention is further illustrated by means of the non-limiting examples given in the accompanying drawings.

[0046] Figure 1 It is a flow chart of a construction method of an assembled multi-ribbed floor structure of the present invention;

[0047] Figure 2 It is a schematic diagram of the overall structure of the formwork-free assembled multi-rib floor of the present invention;

[0048] Figure 3 This is a schematic diagram of a multi-ribbed prefabricated bottom plate of the present invention;

[0049] Figure 4 It is an overall schematic diagram of the steel bar connector of the present invention;

[0050] Figure 5 It is a front view of the steel bar connector of the present invention;

[0051] Figure 6 This is a schematic diagram of a prefabricated steel cage without support formwork of the present invention;

[0052] Figure 7 It is a schematic diagram of the connection method of the joints of the assembled multi-ribbed floor slab using steel bar connectors without disassembly formwork;

[0053] Figure 8 It is a schematic diagram of the arrangement of the steel bars of the upper rib beam of the multi-rib prefabricated bottom plate of the present invention;

[0054] Fig. 9 It is a schematic diagram of a steel mesh of the present invention.

[0055] The main component symbols are described as follows:

[0056] Precast dense-ribbed base plate 00, precast dense-ribbed base plate rib beam extending steel bars 001, precast dense-ribbed base plate rib beam 002, precast dense-ribbed base plate rib beam stirrups 003, reserved space 004 on the upper part of the precast dense-ribbed base plate, steel bar connector 10, upper connector 11, upper bolt hole 111, lower connector 12, lower bolt hole 121, pre-tightening bolts 13, pre-tightening nuts 14, precast steel cage 20 without formwork support, precast steel cage longitudinal bars 21, precast steel cage stirrups 22, precast steel cage lower thin steel plate 23, standardized plastic cavity shell 30, top binding steel bars 40 of precast dense-ribbed base plate rib beam, longitudinal binding steel bars 41, transverse binding steel bars 42, steel mesh 50, longitudinal steel bars 51, transverse steel bars 52, dense transverse steel bars 53, and post-cast concrete 60. DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0058] An installation structure of an assembled ribbed floor and a construction method thereof mainly include the following steps:

[0059] Step 1: Lay the dense-ribbed prefabricated base plate with rib beams and threaded protruding steel bars on the supporting structure at the bottom of the plate in sequence.

[0060] like Figure 3 As shown, the multi-ribbed prefabricated bottom plate 00 with rib beams and threaded protruding steel bars is composed of multi-ribbed prefabricated bottom plate rib beam protruding steel bars 001, multi-ribbed prefabricated bottom plate rib beams 002, multi-ribbed prefabricated bottom plate rib beam stirrups 003, and multi-ribbed prefabricated top reserved space 004. During the processing and production of the multi-ribbed prefabricated bottom plate 00, the ends of the protruding steel bars 001 of the rib beams of the multi-ribbed bottom plate should be stripped and threaded to facilitate the subsequent reliable connection with the radial split steel bar connector 10. When laying the multi-ribbed prefabricated bottom plate 00, the protruding steel bars 001 of the two relative prefabricated multi-ribbed bottom plates should be aligned accordingly and ensure top contact. The end external thread of the protruding steel bars of the rib beams of the multi-ribbed bottom plate is a triangular thread, and the detailed parameters of the external thread are taken according to the metric thread standard specification ISO68-1:1998.

[0061] Step 2: Place the prefabricated steel cage with free formwork at the joint between two opposite prefabricated dense-ribbed bottom plates.

[0062] like Figure 4As shown, the prefabricated steel cage 20 without support formwork is composed of prefabricated steel cage longitudinal force reinforcement 21, prefabricated steel cage hoop reinforcement 22, and prefabricated steel cage lower thin steel plate 23. After the rib beam protruding steel bars 001 of two corresponding dense-ribbed prefabricated bottom plates are connected with the new radial split steel bar connector 10, the prefabricated steel cage 20 without support formwork is placed on the supporting structure at the joint of the two corresponding dense-ribbed prefabricated bottom plates 00.

[0063] Step 3: connect the new radial split steel bar connector with the protruding steel bars of the dense-rib prefabricated bottom plate rib beam to form a reliable threaded connection structure.

[0064] like Figure 5 and Figure 6 As shown, the steel bar connector is composed of an upper connector 11, an upper bolt hole 111, a lower connector 12, a lower bolt hole 121, a pre-tightening bolt 13, and a pre-tightening nut 14. The upper connector 11 and the lower connector 12 are spliced ​​and installed with the end of the protruding steel bar 001 of the prefabricated multi-ribbed bottom plate rib beam, so that the internal threads of the upper and lower connectors form a reliable threaded pair connection with the external threads of the end of the protruding steel bar of the prefabricated multi-ribbed bottom plate rib beam; pre-tightening bolts are installed at the bolt holes 111 / 121 reserved in the upper and lower connectors, and pre-tightening force is applied to the pre-tightening bolt 13, so that the upper connector and the lower connector fit tightly at the contact surface. The internal threads of the upper connector and the lower connector are triangular threads, and the detailed parameters of the internal threads are taken according to the metric thread standard specification ISO68-1:1998.

[0065] Step 4: Install the plastic cavity shell in the reserved space on the upper part of the dense-rib prefabricated bottom plate.

[0066] like Figure 2 As shown, the customized fully enclosed standardized plastic cavity shells 30 are placed in sequence in the reserved space on the upper part of the prefabricated ribbed bottom plate; after the plastic cavity shells are installed, the tops thereof are leveled to ensure that all the plastic cavity shells are approximately at the same height.

[0067] Step 5: Tie up the upper reinforcement of the dense-ribbed prefabricated bottom plate rib beam and lay the reinforcement mesh.

[0068] like Figure 8 and Fig. 9As shown, the upper steel bars 40 of the tied dense ribbed prefabricated bottom plate rib beam are composed of longitudinal tied steel bars 41 and transverse tied steel bars 42, and the steel mesh 50 is composed of longitudinal steel bars 51, transverse steel bars 52, and dense transverse steel bars 53, which are respectively tied to the longitudinal 41 and transverse 42 stress-bearing steel bars of the upper part of the prefabricated bottom plate rib beam; the steel mesh 50 is laid on the prefabricated steel cage 20 without support formwork that has been installed, the dense ribbed prefabricated bottom plate 00, and the standard cavity plastic shell 30 after leveling treatment; the steel mesh 50 above the joint of the two dense ribbed prefabricated bottom plates 00 can be partially densely arranged. The size of the transverse and longitudinal stress-bearing steel bars on the upper part of the tied prefabricated bottom plate rib beam is 20mm; the steel mesh is composed of 8mm steel bars arranged transversely and longitudinally, and the arrangement spacing is 200mm; the size of the partially densely arranged part of the steel mesh laid above the joint of the two dense ribbed prefabricated bottom plates is 8mm.

[0069] Step 6: pour concrete. After the concrete dries and solidifies, it forms an integral force-bearing structure together with the prefabricated steel cage, the prefabricated ribbed bottom plate, the hollow plastic shell, the steel mesh and other components.

[0070] like Figure 2 and Figure 7 As shown, the thin steel plate 23 at the bottom of the prefabricated steel cage 20 of the prefabricated bottom 00 plate is used as a template when pouring concrete; a small aluminum template is arranged at the intersection of the rib beams of the four prefabricated bottom slabs, and the thin steel plate at the bottom of the prefabricated steel cage is used as a template for pouring concrete; after the concrete is poured, it should be maintained in accordance with the corresponding regulations. The size of the small aluminum template is 200mm×200mm.

[0071] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An installation structure of an assembled ribbed floor, characterized in that: It comprises a dense ribbed prefabricated bottom plate, which is composed of a dense ribbed prefabricated bottom plate rib beam protruding steel bars, a dense ribbed prefabricated bottom plate rib beam, and a dense ribbed prefabricated bottom plate rib beam stirrup, the ends of the dense ribbed prefabricated bottom plate rib beam protruding steel bars are processed with external threads, and the two dense ribbed prefabricated bottom plate rib beam protruding steel bars are connected by a steel bar connector; The steel bar connector is composed of an upper connector, a lower connector, a pre-tightening bolt, and a pre-tightening nut. The upper connector and the lower connector are both provided with internal threads that match the external threads of the protruding steel bars of the dense-ribbed prefabricated bottom plate rib beam. The internal threads are triangular threads. The upper connector is provided with an upper bolt hole, and the lower connector is provided with a lower bolt hole. The pre-tightening bolt passes through the upper bolt hole and the lower bolt hole and is connected to the pre-tightening nut.

2. A construction method for an assembled ribbed floor structure, characterized in that: The construction using the installation structure of the assembled ribbed floor body in claim 1 comprises the following steps: Step 1: Lay the prefabricated ribbed bottom plate with ribbed beams and threaded protruding steel bars on the supporting structure at the bottom of the plate in sequence; Step 2: Place the prefabricated steel cage without support formwork at the joint of two opposite prefabricated ribbed bottom plates; Step 3, butt the steel bar connector with the protruding steel bars of the multi-ribbed prefabricated bottom plate rib beam to form a reliable threaded pair connection structure; Step 4: Install the plastic cavity shell in the reserved space on the upper part of the dense-rib prefabricated bottom plate; Step 5, tying the upper steel bars of the dense-ribbed prefabricated bottom plate rib beam and laying the steel mesh; Step 6: pour concrete. After the concrete dries and solidifies, it forms an integral force-bearing structure together with the prefabricated steel cage, the dense-ribbed prefabricated bottom plate, the cavity plastic shell, the steel mesh and other components.

3. The construction method of a prefabricated ribbed floor according to claim 2, characterized in that: The laying of the multi-ribbed prefabricated baseboard in step 1 specifically includes the following steps: Step 1-1, during the processing and production of the multi-ribbed prefabricated base plate, the ends of the protruding steel bars of the rib beams of the multi-ribbed base plate should be stripped and threaded to facilitate the subsequent reliable connection with the steel bar connector; Step 1-2: When laying the multi-ribbed precast slab, the outrigger rib beam reinforcements of two opposing precast multi-ribbed slabs should be aligned accordingly and ensure top contact.

4. The construction method of a prefabricated ribbed floor structure according to claim 2, characterized in that: The specific placement steps in step 2 are: Step 2-1, the prefabricated steel cage without formwork includes a steel cage frame and a thin steel plate at the bottom of the steel cage, prefabricated steel cage stirrups, and prefabricated steel cage stress bars; Step 2-2: After the rib beams of the two corresponding precast dense-ribbed bottom plates have been connected to the new radial split-type steel bar connector, the precast steel cage without support formwork is placed on the supporting structure at the joint of the two corresponding precast dense-ribbed bottom plates.

5. The construction method of a prefabricated ribbed floor according to claim 2, characterized in that: The specific steps of butt jointing the overhanging steel bars in step 3 are as follows: Step 3-1, splice and install the upper connector and the lower connector with the end of the protruding steel bar of the prefabricated multi-ribbed floor rib beam, so that the internal threads of the upper and lower connectors and the external threads of the end of the protruding steel bar of the prefabricated multi-ribbed floor rib beam form a reliable thread pair connection; Step 3-2: Install pre-tightening bolts at the bolt holes reserved in the upper and lower connectors, and apply pre-tightening force to the pre-tightening bolts to make the upper connector and the lower connector fit tightly at the contact surface.

6. The construction method of a prefabricated ribbed floor according to claim 2, characterized in that: The specific steps for installing the plastic cavity shell in step 4 are as follows: Step 4-1, place the customized fully enclosed standardized plastic cavity shell in the reserved space on the upper part of the dense-rib prefabricated bottom plate in sequence; Step 4-2: After the plastic cavity shells are installed, level the tops thereof to ensure that all the plastic cavity shells are approximately at the same height.

7. The construction method of a prefabricated ribbed floor structure according to claim 2, characterized in that: The specific steps of step 5 of tying the upper steel bars of the dense-ribbed prefabricated bottom plate rib beam and laying the steel mesh are as follows: Step 5-1, tie the transverse and longitudinal stress-bearing steel bars on the upper part of the prefabricated bottom plate rib beam respectively; Step 5-2: Lay the steel mesh on the prefabricated steel cage, the prefabricated ribbed bottom plate, the leveled standard cavity plastic shell and other components that have been installed; Step 5-3: Locally increase the density of the steel mesh above the joints of the two dense-ribbed precast bottom plates.

8. The construction method of a prefabricated ribbed floor structure according to claim 2, characterized in that: The specific pouring steps in step 6 are: Step 6-1, the thin steel plate at the bottom of the prefabricated steel cage at the joint of the dense-ribbed prefabricated bottom plate is used as a template when pouring concrete; Step 6-2: Arrange a small aluminum formwork at the intersection of the four prefabricated ribbed bottom slab rib beams, and use it together with the thin steel plate at the bottom of the prefabricated steel cage as a formwork for pouring concrete; Step 6-3: After the concrete is poured, it should be cured in accordance with relevant regulations.

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