Independent node assembled frame structure and construction method

Abstract

The present invention provides an independent node assembled frame structure and construction method. The method comprises: determining the position of the prefabricated node and placing it; mechanically connecting the main beam steel frame and the secondary beam steel frame between the prefabricated nodes; installing the main beam frame and the secondary beam frame under the main beam steel frame and the secondary beam steel frame respectively; pouring concrete into the main beam frame and the secondary beam frame; laying the floor slab on the frame formed by the main beam frame and the secondary beam frame, leaving a post-casting strip between the adjacent two span frame floors and casting concrete therein; installing the column steel frame on the prefabricated node; sleeve the column frame on the column steel frame; installing the previous layer of prefabricated nodes on the column steel frame; pouring concrete in the column frame to complete a frame construction process. The frame construction of the present invention is centered on the prefabricated node, eliminating the construction process of the on-site assembled building node. The beam frame and the column frame play the role of positioning and serving as a template. There is no process of template disassembly and reuse during construction, which greatly reduces the construction cost.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and in particular to an independent node assembled frame structure and a construction method thereof. Background Art

[0002] In recent years, with the promotion of policies, prefabricated buildings are gradually becoming the mainstream form of construction. Compared with traditional buildings, prefabricated buildings need to meet higher conditions. Its prefabrication rate, assembly rate, and green construction are all important standards for evaluation and control. Although prefabricated buildings have been widely used in the general environment, they have obvious advantages and disadvantages. Through a comprehensive analysis of the shortcomings of current prefabricated buildings, we can formulate a complete solution to promote the development of the prefabricated building industry. At present, the main prefabricated building practices in my country are based on prefabricated reinforced concrete structural systems (PC). After a period of practice, it can be understood that in addition to the precision problems such as dimensional deviation in the production of PC components, due to process problems and improper operation of construction personnel during construction, the overall structure will be unevenly stressed, especially the node position is the most complicated. If the node part is not handled well, serious problems such as structural failure will occur. At present, the common quality problems of prefabricated buildings are mainly: (1) dimensional deviation of components; (2) clogging of sleeve grouting; (3) treatment of exposed steel bars; (4) insufficient anchoring capacity of anchors; (5) weak protection measures during component transportation; (6) component stacking problems; (7) inadequate cleaning of bottom debris before grouting connection. Prefabricated buildings have many advantages, such as fast construction progress, energy saving and environmental protection, and saving of formwork; however, traditional cast-in-place buildings have their own advantages. "More prefabrication or more cast-in-place is not the essence of prefabrication." Therefore, how to make good use of the advantages of cast-in-place in prefabricated buildings is an important content that needs to be studied in the next step of prefabricated buildings.

[0003] In addition to the above-mentioned problems, prefabricated frame structures also have their own unique technical problems, which can be summarized as the following five points: (1) The wet construction at the nodes of prefabricated buildings leads to a lack of integrity, unsatisfactory shear and seismic performance, and the overall stress performance cannot be guaranteed; (2) The lengths of the reserved exposed steel bars of PC components vary. During transportation, the exposed steel bars of the components will be bent or artificially processed into a curved shape for the convenience of transportation, resulting in a decrease in the yield strength of the steel bars; (3) The current sleeve grouting method has drawbacks that cannot be ignored, mainly reflected in the lack of effective detection methods for the density of the grouting material at the grout-anchor connection joint. In addition to the quality problems of the grouting materials on the market, the detection requires a damage test, and the structural reinforcement after the damage test affects the safety; (4) The columns and beams do not combine the advantages of cast-in-place, and a large number of prestressed components are used, resulting in a single mechanical property; (5) There is no reference for actual operation positioning, which may lead to the formation of splicing seams. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems, thereby providing an independent node assembled frame structure and a construction method.

[0005] To achieve the above object, in a first aspect, the present invention provides a method for constructing an independent node assembled frame structure, the method comprising the following steps:

[0006] 1) Determine the location of the prefabricated nodes and place them;

[0007] 2) Connect sleeves to the steel bar threaded joints of the main beam steel bar skeleton and the secondary beam steel bar skeleton, and move the main beam steel bar skeleton and the secondary beam steel bar skeleton to between the two prefabricated nodes. Insert the main beam steel bar threaded joints and the secondary beam steel bar threaded joints extending out of the prefabricated nodes into the sleeves and align them with the steel bar threaded joints of the main beam steel bar skeleton and the secondary beam steel bar skeleton, and then rotate and tighten the sleeves in the direction of the prefabricated nodes;

[0008] 3) installing the main beam frame and the secondary beam frame under the main beam reinforcement skeleton and the secondary beam reinforcement skeleton respectively, wherein the main beam frame and the secondary beam frame are U-shaped groove structures;

[0009] 4) Pour concrete into the main beam frame and secondary beam frame, and vibrate the concrete;

[0010] 5) After the initial setting of the concrete in the main beam frame and the secondary beam frame, the floor slab is laid on the frame surrounded by the main beam frame and the secondary beam frame, and a post-casting strip is left in the middle of the floor slabs laid on the frames of the two adjacent spans. After the installation of the floor slabs of the two adjacent spans is completed, concrete is cast in the post-casting strip to make the floor slabs of the two adjacent spans and the frame structure form a whole;

[0011] 6) Connect the sleeve to the steel bar threaded joint of the column steel bar skeleton, move the column steel bar skeleton to each prefabricated node, insert the column steel bar threaded joint extending above the prefabricated node into the sleeve and align it with the steel bar threaded joint of the column steel bar skeleton, and then rotate and tighten the sleeve in the direction of the prefabricated node;

[0012] 7) Sleeve the column frame onto the column reinforcement skeleton, wherein the column frame is a thin-walled tube that is sealed on all sides and opened at the top and bottom, and a pouring port is opened on one side of the upper end;

[0013] 8) Install the upper prefabricated node on the column reinforcement skeleton, specifically: insert the column reinforcement threaded joint extending below the upper prefabricated node into the sleeve above the column reinforcement skeleton and align it with the reinforcement threaded joint inside, then rotate and tighten the sleeve in the direction of the upper prefabricated node;

[0014] 9) Pour concrete into the column frame through the pouring port and vibrate the concrete. After the concrete pouring is completed, seal the pouring port to prevent leakage. At this time, the construction process of one frame is completed. Repeat the above steps to complete the construction process of the next frame.

[0015] Furthermore, the following steps are also included between step 3) and step 4):

[0016] 10) Install a detachable beam frame fixing bracket under the steel bar threaded joints extending in all directions of the prefabricated node, and set a supporting device in the middle below the main beam frame and the secondary beam frame.

[0017] Furthermore, in the step 10), the detachable beam frame fixing bracket is a hollow right-angled triangular prism, and bolts are provided on the smaller right-angled surface of the hollow right-angled triangular prism. The connection between the detachable fixing bracket and the prefabricated node is achieved by the bolts cooperating with the bolt holes reserved on the prefabricated node.

[0018] Furthermore, in the step 2), the length of each steel bar threaded joint of the main beam steel bar skeleton and the secondary beam steel bar skeleton is half of the length of the sleeve.

[0019] Furthermore, in the step 3), the length between the prefabricated nodes at both ends of the main beam frame is greater than 2 cm of the main beam frame, and the length between the prefabricated nodes at both ends of the secondary beam frame is greater than 2 cm of the secondary beam frame. After the main beam frame and the secondary beam frame are installed, the joints are sealed with sealing materials to ensure that there is no leakage when pouring concrete.

[0020] Furthermore, the floor slab in step 5) is an octagon with four chamfered corners.

[0021] Furthermore, in the step 7), the height of the column frame is 6 cm lower than the total height of the column reinforcement skeleton, and the total height of the column reinforcement skeleton includes the height of the sleeve. After the column reinforcement skeleton is connected to the prefabricated node of the upper layer, the 6 cm gap is sealed with sponge or foam to ensure that there is no leakage when pouring concrete.

[0022] In a second aspect, the present invention provides an independent node assembled frame structure, the structure comprising: a prefabricated node, a main beam steel frame, a secondary beam steel frame, a column steel frame, a main beam frame, a secondary beam frame and a column frame;

[0023] The main beam reinforcement skeleton and the secondary beam reinforcement skeleton are arranged between two adjacent prefabricated nodes in the horizontal direction, and the reinforcement threaded joint of the main beam reinforcement skeleton and the main beam reinforcement threaded joint extending out of the prefabricated node are connected by sleeve threads, and the reinforcement threaded joint of the secondary beam reinforcement skeleton and the secondary beam reinforcement threaded joint extending out of the prefabricated node are connected by sleeve threads; the main beam frame and the secondary beam frame are U-shaped groove structures, respectively wrapped around the outer periphery of the main beam reinforcement skeleton and the secondary beam reinforcement skeleton with the groove upward, and concrete is poured in the main beam frame and the secondary beam frame, and the concrete poured in the main beam frame and the secondary beam frame is flush with the upper end surface of the prefabricated node, and a floor slab is laid on the frame surrounded by the main beam frame and the secondary beam frame, and a post-cast strip is provided between the floor slabs laid on the frames of two adjacent spans, and concrete is poured in the post-cast strip;

[0024] The column reinforcement skeleton is arranged between two adjacent prefabricated nodes in the vertical direction, and the reinforcement threaded joint of the column reinforcement skeleton and the column reinforcement threaded joint extending below the prefabricated node are connected by a sleeve thread; the column frame is a thin-walled tube with an annular seal and upper and lower openings, and concrete is poured in the column frame.

[0025] Furthermore, the structure also includes a detachable fixing bracket installed below the steel bar threaded joints extending in all directions of the prefabricated node. The detachable fixing bracket is a hollow right-angled triangular prism. Bolts are provided on the smaller right-angled surface of the hollow right-angled triangular prism. The connection between the detachable fixing bracket and the prefabricated node is achieved by the bolts cooperating with the bolt holes reserved on the prefabricated node.

[0026] Furthermore, the floor slab is an octagon with four chamfered corners.

[0027] The present invention integrates the nodes of the assembled frame structure into one, and there is no steel bar joint inside the node. Compared with the traditional assembled building in structure, it has the characteristics of "strong node and weak component"; except for the prefabricated nodes, there is no exposed steel bar in the whole assembly system, which is convenient for processing and manufacturing in the factory and transportation outside the factory, and can avoid the problem of uneven force caused by damage to the steel bars of the component during transportation; the prefabricated column frame and the prefabricated beam frame are used to accurately locate the on-site construction and have the function of the template at the same time. The whole construction process does not have the process of template disassembly and reuse, which greatly reduces the construction cost and has the characteristics of energy saving and environmental protection; the idea of ​​the assembled building is to disassemble the whole into components, and the idea of ​​the present invention goes a step further, the components are refined into parts, the traditional prefabricated columns and prefabricated beams are converted into column frames and beam frames, and the advantages of the cast-in-place method are combined, and this discretization method is used to save economy and improve quality from the three aspects of production, transportation and construction, so that the construction process is more environmentally friendly, the construction method is more convenient and fast, and the refined parts are more suitable for automatic processing, thereby improving production efficiency; the present invention does not require a grouting process, and can completely avoid various problems caused by grouting. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A flow chart of a method for constructing an independent node assembled frame structure provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of a prefabricated node provided in an embodiment of the present invention;

[0030] Figure 3 for Figure 2 A schematic diagram of the front view structure of

[0031] Figure 4 for Figure 2 Schematic diagram of the internal reinforcement structure;

[0032] Figure 5A schematic diagram of a main beam reinforcement skeleton structure provided by an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of a secondary beam reinforcement skeleton structure provided by an embodiment of the present invention;

[0034] Figure 7 A schematic diagram of a column reinforcement skeleton structure provided by an embodiment of the present invention;

[0035] Figure 8 A schematic diagram of the main beam frame and secondary beam frame structure provided by an embodiment of the present invention;

[0036] Fig. 9 A schematic diagram of a column frame structure provided by an embodiment of the present invention;

[0037] Fig.10 A schematic diagram of the placement of prefabricated nodes provided in an embodiment of the present invention;

[0038] Fig.11 The main beam reinforcement skeleton and the secondary beam reinforcement skeleton are Fig.10 Structural diagram of prefabricated node connections;

[0039] Fig.12 The main beam frame and the secondary beam frame are respectively Fig.11 Schematic diagram of the installation structure of the middle main beam reinforcement skeleton and the secondary beam reinforcement skeleton;

[0040] Fig.13 Fix brackets for removable beam frames and Fig.10 Schematic diagram of the installation structure of the prefabricated node;

[0041] Fig.14 for Fig.13 A schematic diagram of the structure of the detachable beam frame fixing bracket;

[0042] Fig.15 for Fig.12 Structural schematic diagram of pouring concrete in the middle main beam frame and secondary beam frame;

[0043] Fig.16 For Fig.15 A structural diagram of installing the floor slab on a frame formed by a main beam frame and a secondary beam frame;

[0044] Fig.17 for Fig.16 Structural diagram of the middle floor;

[0045] Fig.18 For Fig.16 A schematic diagram of the structure of installing a column reinforcement skeleton on a prefabricated node is shown;

[0046] Fig.19 For Fig.18 A schematic diagram of the structure of installing a column frame on a column reinforcement skeleton is shown;

[0047] Fig. 20 For Fig.19 A schematic diagram of the structure of installing the upper prefabricated nodes on the column frame shown;

[0048] Fig.21 For Fig. 20 The schematic diagram of the structure of pouring concrete in the column frame shown;

[0049] Fig. 22 A schematic diagram of an independent node assembly frame structure provided by an embodiment of the present invention;

[0050] The accompanying drawings are marked as follows:

[0051] 1-prefabricated node, 1.1-reinforcement skeleton, 1.11-main beam reinforcement, 1.12-secondary beam reinforcement, 1.13-column reinforcement, 1.14-stirrups, 1.15-reinforcement threaded joint, 1.2-concrete body, 1.21-reserved beam frame bracket installation hole, 2-main beam reinforcement skeleton, 2.1-main beam reinforcement, 2.2-stirrups, 2.3-sleeve, 3-secondary beam reinforcement skeleton, 3.1-secondary beam reinforcement, 3.2-stirrups, 3.3-sleeve, 4-column reinforcement skeleton, 4.1-column reinforcement, 4.2-stirrups, 4.3-sleeve, 5-main beam frame, 6-secondary beam frame, 7-column frame, 8-floor slab, 9-post-cast strip, 10-beam frame detachable fixing bracket. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] The present invention aims to fundamentally solve the problems of poor integrity and insufficient mechanical properties of the existing prefabricated frame structure beam-column nodes. It starts from reducing production and processing costs and facilitating component transportation, and finally combines the advantages of cast-in-place and applies them to the on-site construction of prefabricated beams and columns, so as to achieve the advantages of improving building quality, increasing the speed of prefabricated construction, reducing labor costs on the construction site, increasing the assembly rate, and energy saving and environmental protection, which are the advantages of new prefabricated buildings.

[0054] Figure 1 A flow chart of a method for constructing an independent node assembled frame structure provided in an embodiment of the present invention.

[0055] like Figure 1As shown, the method for constructing an independent node assembled frame structure provided by an embodiment of the present invention comprises the following steps:

[0056] In step 101, the position of the prefabricated node is determined and placed. Each prefabricated node is prefabricated in a factory. First, the steel skeleton inside the entire prefabricated node is built, and then the template in the factory is used to cast the entire prefabricated node in one step. The steel bar threaded joints extending out of the prefabricated node can be mechanically connected to the sleeve. The length of each joint is determined according to the length of the sleeve, which is half of the length of the sleeve. The structure is as follows Figures 2 to 4 The location of each prefabricated node is determined by on-site surveying personnel after laying out and measuring. Fig.10 shown.

[0057] In step 102, the main beam reinforcement skeleton and the secondary beam reinforcement skeleton are installed: sleeves are connected to the threaded joints of the reinforcements of the main beam reinforcement skeleton and the secondary beam reinforcement skeleton, such as Figure 5 and Figure 6 As shown, the main beam reinforcement skeleton and the secondary beam reinforcement skeleton are moved between two adjacent prefabricated nodes, and the main beam reinforcement threaded joints and the secondary beam reinforcement threaded joints extending from the prefabricated nodes are inserted into the sleeves and aligned with the reinforcement threaded joints of the main beam reinforcement skeleton and the secondary beam reinforcement skeleton, and then mechanically connected by rotating and tightening the sleeves in the direction of the prefabricated nodes. The installation result is shown in Fig.11 shown.

[0058] During the specific implementation, the main beam steel frame and the secondary beam steel frame are hoisted to the position where they need to be installed. The hoisting equipment cannot be loosened during installation. When the on-site construction conditions allow, four steel frames can be installed at the same time. If the hoisting equipment is insufficient or the site conditions do not allow, two steel frames can be installed at the same time to save construction time and improve construction efficiency. During the installation process, the sleeve is first fully sleeved on the steel threaded joints of the main beam steel frame and the steel threaded joints of the secondary beam steel frame. The length of the sleeve is twice the length of the steel threaded joints of the steel frame. After the construction personnel align the steel threaded joints of the steel frame and the protruding steel threaded joints on the prefabricated node, they use a wrench to rotate the full sleeve clockwise toward the prefabricated node. When the sleeve is completely connected to the two steel threaded joints, continue to connect the next sleeve according to the above steps. Since the joint part is half the length of the sleeve, there is no need to worry about the problem that the steel bar plus the sleeve are too long and the other side cannot be installed. The constraints of the hoist can be released after the installation of the main and secondary beam steel frames are completed. Among them, in this step, after rotating and tightening the sleeve, the stirrups can be increased outside the steel bar threaded joint between the sleeve and the prefabricated node to increase the shear resistance of the main beam steel bar skeleton joint and the secondary beam steel bar skeleton.

[0059] In step 103, the main beam frame and the secondary beam frame are installed: the main beam frame and the secondary beam frame are installed below the main beam reinforcement skeleton and the secondary beam reinforcement skeleton respectively, and the main beam frame and the secondary beam frame are U-shaped groove structures, such as Figure 8 The main beam frame and the secondary beam frame are prefabricated in the factory with high-strength cement mortar and high-strength steel wire mesh. In order to ensure that the formwork and the cast-in-place concrete form a whole, it is also necessary to set a suitable roughness on the inside of the beam frame. The beam frame can not only play the role of on-site positioning, but also play the role of formwork, which can increase the accuracy of prefabricated construction and save the consumption of formwork, and play a role in energy conservation and environmental protection. The installation results are shown in Fig.12 shown.

[0060] During the specific implementation, the main beam frame and the secondary beam frame are hoisted to the lower part of the installed main beam reinforcement skeleton and the secondary beam reinforcement skeleton by a hoist. In order to facilitate the overlap, the length of the beam frame should be about 2cm smaller than the actual length between the two nodes. After the beam frame is installed, the joints are sealed with plugging materials to ensure that there will be no leakage when pouring concrete. Similar to the installation of the beam reinforcement skeleton, four beam frames can be installed at the same time when site conditions permit, and two can be installed at the same time if not permitted; unlike the installation of the beam reinforcement skeleton, since a certain margin is left in the sleeve when the beam reinforcement skeleton is installed, and the length of the beam frame is fixed, if the beam frame cannot be installed, it can be fed back that the positioning of the prefabricated node is inaccurate.

[0061] In step 104, a detachable beam frame fixing bracket is installed under the steel bar skeleton extending outward in all directions of the prefabricated node, and a vertical support is set in the middle of the main beam frame and the secondary beam frame. Installing the detachable beam frame fixing bracket is mainly to fix the beam frame installed in step 103. The detachable beam frame fixing bracket is as follows: Fig.14 As shown in the figure, in order to meet the force requirements, this bracket is designed as a hollow right-angled triangular prism. Bolts are provided on the smaller right-angled surface of the hollow right-angled triangular prism. The bolts cooperate with the bolt holes reserved on the prefabricated nodes to realize the connection between the detachable fixed bracket and the prefabricated node. When installing, just screw the bolts at the tail of the bracket clockwise into the holes reserved in the prefabricated nodes. After the concrete in the beam frame solidifies, it can be disassembled. This bracket is easy to install and disassemble, and can be used flexibly according to the installation sequence of the beam frame. After installation, Fig.13 Install the support device ( Fig.13 The purpose is to prevent the beam from deflecting due to its own weight or the beam frame from breaking in the middle due to its inability to bear its own weight.

[0062] In step 105, concrete is poured into the main beam frame and the secondary beam frame. In order to prevent quality problems caused by uneven distribution of coarse and fine aggregates, it is necessary to vibrate when pouring concrete. After the concrete pouring in the beam frame is completed, it is leveled to keep the main beam and the secondary beam flush with the upper part of the precast node. Fig.15 shown.

[0063] In step 106, after the concrete in the main beam frame and the secondary beam frame is initially set, the floor slab is laid on the frame surrounded by the main beam frame and the secondary beam frame, and a post-casting strip is left between the floor slabs laid on the frames of two adjacent spans, and concrete is cast in the post-casting strip to form a whole with the floor slab and the frame structure. Fig.16 shown.

[0064] In specific implementation, after the concrete in the beam frame is initially set, the floor slab is laid. Since the threaded joints of the steel bars connecting the upper part of the prefabricated node with the column steel bar skeleton cannot be blocked, the floor slab is designed as an octagon with four chamfered corners in the embodiment of the present invention, such as Fig.17 As shown, the floor slab can be a composite slab with better performance or a hollow slab directly. The specific situation needs to be selected according to the local earthquake level and the use of the building. A post-cast strip must be left in the middle of the floor slabs laid on the adjacent span frames. The cast-in-place concrete in the post-cast strip is connected to ensure the integrity and mechanical properties of each floor slab.

[0065] In step 107, a sleeve is connected to the threaded joint of the steel bar of the column steel bar skeleton, such as Figure 7 As shown, move the column reinforcement skeleton to each prefabricated node, align the steel bar thread joints of the column reinforcement skeleton extending outward above the prefabricated node with the steel bar thread joints of the column reinforcement skeleton, and then extend them into the sleeve, and rotate and tighten the sleeve in the direction of the prefabricated node, as shown in FIG. Fig.18 shown.

[0066] In specific implementation, the column reinforcement skeleton can be installed after the concrete on the post-cast strip of the floor construction joint reaches a certain strength. The column reinforcement skeleton is first hoisted to the installation position, and the construction personnel use tools to rotate the sleeve on the steel bar threaded joint of the column reinforcement skeleton downward counterclockwise until the sleeve is completely locked on the upper and lower threaded joints. In order to improve construction efficiency, two workers can construct a node at the same time; in order to ensure safety, the hoisting equipment cannot be loosened when installing the column reinforcement skeleton, and the hoisting equipment will be released after the installation is completed. Since two points can determine a line, and only one point below can be determined when installing the column reinforcement skeleton, special attention should be paid to the verticality when installing the column reinforcement skeleton. Whether it is vertical is the key to successful installation, and a technician can monitor it in real time when installing the column reinforcement skeleton.

[0067] In step 108, the column frame is sleeved on the column reinforcement frame. The column frame is a thin-walled tube with sealed sides and upper and lower openings, and a pouring port is opened on one side of the upper end. The structure of the column frame is as follows: Fig. 9 As shown. The column frame is made by prefabricating fiber-reinforced polymer in the factory using long fiber winding method, spin casting method, etc. to form a thin-walled tube that is sealed on all sides. The column frame can not only play the role of on-site positioning, but also play the role of template, which can increase the accuracy of prefabricated construction and save the consumption of templates, playing the role of energy saving and environmental protection.

[0068] During the specific implementation, the column frame is hoisted to the top of the column reinforcement skeleton by a hoisting device, and then slowly lowered toward the center point. There are two key points in this step. First, there should be no gap between the bottom of the column frame and the prefabricated node of the lower layer, so as to avoid leakage when pouring concrete. If the gap exists due to factors such as production accuracy, it is necessary to use corresponding tools and materials to seal the gap in time; secondly, in order to facilitate the connection between the upper steel bar threaded joint of the column reinforcement skeleton and the column reinforcement threaded joint extending outward from the lower part of the upper prefabricated node, the height of the column frame should be about 6cm lower than the column reinforcement skeleton. After the connection with the upper prefabricated node is completed, the 6cm gap should be sealed with sponge or foam, such as Fig.19 In the embodiment of the present invention, the height of the column frame is about 6 cm lower than the column reinforcement tube, which can facilitate the wrench operation after the column reinforcement threaded joint extending from the upper part of the column reinforcement skeleton is aligned with the column reinforcement threaded joint extending from the lower part of the upper prefabricated node, that is, the wrench can enter the rotating sleeve through the 6 cm gap.

[0069] In step 109, the upper prefabricated node is installed, specifically: the steel bar threaded joint extending below the upper prefabricated node is aligned with the steel bar threaded joint sleeve above the column steel bar skeleton, and the sleeve is rotated and tightened in the direction of the upper prefabricated node, such as Fig. 20 shown.

[0070] In step 110, concrete is poured into the column frame through the pouring opening of the column frame, and the concrete is vibrated. To facilitate pouring, the pouring opening can be set in the form of a bell mouth. After the concrete pouring is completed, the pouring opening is sealed to prevent leakage. At this time, the construction process of a frame structure is completed, and the above steps are repeated to complete the construction process of the next frame. Fig.21 shown.

[0071] The above-mentioned prefabricated nodes of the present invention are independent nodes, which are dry-constructed nodes. They do not require subsequent pouring or grouting. They can be used after being transported to the site after being prefabricated in the factory, eliminating the relatively complicated on-site node construction process and avoiding wet construction, especially the problems caused by sleeve grouting. The frame construction of the present invention is centered on the prefabricated nodes. The beam frames and column frames wrap the internal steel skeleton and dock with the prefabricated nodes. The beam frames and column frames play a role in positioning and serving as templates. The entire construction process does not involve the process of template disassembly and reuse, which greatly reduces construction costs and has the characteristics of energy saving and environmental protection. The prefabricated components are refined into parts, and all parts are easy to process and manufacture in the factory. The shapes of batch parts are regular and the same, so they can be easily transported from the factory to the construction site. Figure 7 The column reinforcement skeleton shown, Figure 5 The main beam reinforcement skeleton and Figure 6The secondary beam steel skeleton shown can be processed in the factory and then transported to the construction site. Since there is no concrete wrapped on the outside and the shape is regular, the weight and shape are less affected during transportation. In addition, the production of this steel skeleton only requires three processes: cutting, bending and spot welding (or binding). The production method is simple and easy to implement. The stirrups on both sides of the main beam and secondary beam steel skeletons need to be reinforced. If the conditions on the construction site permit, a steel processing plant can be built on site. After the steel bars are transported in batches to the site, they can be processed in appropriate amounts according to daily demand. This can solve the problem of material stacking. Compared with the transportation of steel skeletons, the transportation of raw materials for steel bars can not only save transportation space, but also realize the transportation from the steel bar factory to the site. There is no need for secondary transportation from the assembly factory to the site, which can greatly save transportation costs.

[0072] like Fig.21 and 22 As shown, an embodiment of the present invention provides an independent node assembled frame structure constructed by the above method, which includes a prefabricated node 1, a main beam steel frame 2, a secondary beam steel frame 3, a column steel frame 4, a main beam frame 5, a secondary beam frame 6 and a column frame 7. During construction, with the prefabricated node 1 as the center, the main beam frame 5, the secondary beam frame 6 and the column frame 7 wrap the internal steel frame and dock with the prefabricated node 1.

[0073] like Figures 2 to 4 As shown, the prefabricated node 1 is prefabricated in a factory, and comprises a steel skeleton 1.1 and a concrete body 1.2. The concrete body 1.2 is provided with reserved beam frame bracket mounting holes 1.21.

[0074] The steel bar skeleton 1.1 includes main beam steel bars 1.11, secondary beam steel bars 1.12, column steel bars 1.13 and stirrups 1.14. The two ends of the main beam steel bars 1.11, secondary beam steel bars 1.12 and column steel bars 1.13 are provided with steel bar threaded joints 1.15. The steel bar threaded joints 1.15 can be mechanically connected with the sleeves on the main beam steel bar skeleton 2, secondary beam steel bar skeleton 3 and column steel bar skeleton 4. The length of each joint is determined according to the length of the sleeve, which is half of the sleeve length. During prefabrication, the steel bar skeleton 1.1 inside the entire prefabricated node 1 is first erected, and then the whole is cast in one step using the formwork in the factory. The steel bar threaded joints 1.15 extending outward from the prefabricated node 1.1 can be mechanically connected with the sleeve, and the concrete body 1.2 completely wraps the steel bar skeleton of the prefabricated node 1 and leaves a protective layer thickness. When manufactured in the factory, no steel bars shall be exposed except for the steel bar threaded joints. The arrangement of the steel bars in the prefabricated node is as follows: Figure 4As shown, all the internal steel bars are integral, and stirrups 1.14 are densely arranged at the lower part of the junction of the main beam steel bar 1.11, the secondary beam steel bar 1.12 and the column steel bar 1.13 of the prefabricated node 1. The main beam steel bar 1.11, the secondary beam steel bar 1.12 and the column steel bar 1.13 in the node are staggered. In order to meet the requirements of current standards such as GB 50010 and GB / T 51231, the distance from the frame column edge to the steel bar threaded joint of the present invention meets ≥0.5hb and ≥300mm, where hb is the cross-sectional height of the beam, such as Figure 3 shown.

[0075] like Figure 5 As shown, the main beam reinforcement skeleton 2 includes main beam reinforcement 2.1, stirrups 2.2 and sleeves 2.3. Stirrups 2.2 are arranged outside the main beam reinforcement 2.1, and the arrangement density of stirrups 2.2 at both ends of the main beam reinforcement 2.1 is greater than that of stirrups 2.2 in the middle. Threaded joints are provided at both ends of the main beam reinforcement 2.1, and sleeves 2.3 are threadedly sleeved on the joints.

[0076] like Figure 6 As shown, the secondary beam reinforcement skeleton 3 includes secondary beam reinforcement 3.1, stirrups 3.2 and sleeves 3.3. The stirrups 3.2 are arranged outside the secondary beam reinforcement 3.1, and the arrangement density of the stirrups 3.2 at both ends of the secondary beam reinforcement 3.1 is greater than that of the stirrups 3.2 in the middle. Both ends of the secondary beam reinforcement 3.1 are provided with reinforcement threaded joints, and the sleeves 3.3 are threadedly sleeved on the joints.

[0077] like Figure 7 As shown, the column reinforcement skeleton 4 includes column reinforcement 4.1, stirrups 4.2 and sleeves 4.3, and the stirrups 4.2 are evenly arranged outside the column reinforcement 4.1. Both ends of the column reinforcement 4.1 are provided with reinforcement threaded joints, and the joints are threadedly sleeved with sleeves 4.3.

[0078] like Figure 8 As shown, the main beam frame 5 and the secondary beam frame 6 have the same structure, which is a U-shaped groove structure, and are formed by prefabricating high-strength cement mortar and high-strength steel wire mesh in a factory.

[0079] like Fig. 9 As shown, the column frame 7 is a thin-walled tube which is sealed on all sides and opened at the top and bottom, and a casting port 7.1 is opened on one side of the upper end. The column frame 7 is made by prefabricating fiber-reinforced polymer in a factory using a long fiber winding method, a spin casting method, etc. to form a thin-walled tube which is sealed on all sides.

[0080] like Fig.21 and 22As shown, the main beam reinforcement skeleton 2 and the secondary beam reinforcement skeleton 3 are arranged between two adjacent prefabricated nodes 1 in the horizontal direction, and the reinforcement threaded joint of the main beam reinforcement skeleton 2 and the main beam reinforcement threaded joint extending out of the prefabricated node 1 are threadedly connected through sleeves 2.3, and the reinforcement threaded joint of the secondary beam reinforcement skeleton 3 and the secondary beam reinforcement threaded joint extending out of the prefabricated node 1 are threadedly connected through sleeves 3.3.

[0081] The main beam frame 5 and the secondary beam frame 6 are U-shaped trough structures prefabricated in the factory with high-strength cement mortar and high-strength steel wire mesh. The beam frame can play the role of on-site positioning and formwork, thereby increasing the accuracy of prefabricated construction and saving the consumption of formwork, playing the role of energy conservation and environmental protection. The main beam frame 5 and the secondary beam frame 6 respectively half-wrap the main beam steel frame 2 and the secondary beam steel frame 3 in the upward direction with the notch. Concrete is poured in the main beam frame 5 and the secondary beam frame 6. The concrete in the main beam frame 5 and the secondary beam frame 6 is flush with the upper end surface of the prefabricated node 1. The frame surrounded by the main beam frame 5 and the secondary beam frame 6 is paved with a floor slab 8, and a post-cast strip 9 is provided between the floor slabs laid on the frames of two adjacent spans. Fig.16 As shown, concrete is poured in the post-casting strip 9, and the cast-in-place concrete in the post-casting strip 9 ensures the integrity and mechanical properties of each floor slab. The floor slab 8 can be a composite floor slab with better performance at present or a hollow slab directly, and the specific situation needs to be selected according to the actual earthquake level and the use of the building.

[0082] The column reinforcement skeleton 4 is arranged between two adjacent prefabricated nodes 1 in the vertical direction, and the steel bar threaded joints of the column reinforcement skeleton 4 and the column reinforcement threaded joints extending upward and downward from the prefabricated node 1 are mechanically connected through sleeves 4.3. The column frame 7 is a thin-walled tube with sealed openings on all sides and upper and lower openings, and the column frame 7 is poured with concrete.

[0083] During specific implementation, in order to fix the installed main beam frame 5 and secondary beam frame 6, the embodiment of the present invention also includes a detachable fixing bracket 10 installed on the reserved hole 1.21 of the prefabricated node 1. In order to meet the force requirements, the detachable beam frame fixing bracket is designed as a hollow right-angled triangular prism. Bolts 10.1 are provided on the smaller surface of the hollow right-angled triangular prism. The bolts 10.1 cooperate with the beam frame bracket installation holes 1.21 reserved on the prefabricated node to realize the connection between the detachable fixing bracket and the prefabricated node. During installation, it is only necessary to screw the bolts at the tail of the bracket clockwise into the holes reserved in the prefabricated node, and then remove it after the concrete in the beam frame solidifies. This bracket is easy to install and disassemble, and can be flexibly used according to the installation sequence of the beam frame. After the installation is completed, Fig.13 shown.

[0084] In specific implementation, since the steel bar threaded joint connecting the upper part of the prefabricated node 1 with the column steel bar skeleton cannot be blocked, the floor slab 8 in the embodiment of the present invention is an octagon with chamfered corners, such as Fig.17 shown.

[0085] It should be noted that the main beam steel frame 2, the secondary beam steel frame 3, the column steel frame 4 and the steel structure in the prefabricated node 1 in the embodiment of the present invention can change the number and arrangement of steel bars according to the actual needs of the project during actual use.

[0086] In summary, the beneficial effects of the present invention are related to structure, production, transportation, energy saving, etc., and have the following advantages:

[0087] 1. The present invention does not require grouting throughout the entire process, and can solve the problems caused by the shortcomings of the current grouting wet construction process.

[0088] 2. The nodes are separated and the steel bars inside the nodes are arranged reasonably, so the integrity of the nodes is stronger and their mechanical properties are better than the current prefabricated wet construction nodes.

[0089] 3. The on-site production of nodes is relatively complicated, and the quality is often not guaranteed due to human or material influences. The prefabricated independent node factory production method of the present invention is simple, saving money and labor.

[0090] 4. The basic idea of ​​prefabricated buildings is to split the building into components. The idea of ​​the present invention goes a step further: the split components are further refined into parts. For example, the steel skeleton, column frame, and beam frame in the present invention are all manifestations of this idea. This approach can fundamentally improve production efficiency and save resources. The refined parts are more suitable for factory automation processing, which paves the way for the popularization of intelligent manufacturing in the future.

[0091] 5. The refined parts are smaller in size and more regular in shape, which is convenient for transportation. There is no excessively long exposed steel bars in the entire assembly system, so there is no need to worry about the steel bars being bent during transportation and their mechanical properties being reduced.

[0092] 6. The present invention combines the advantages of assembly and cast-in-place, taking the best of each, and solves the problem of single mechanical properties of prefabricated components.

[0093] 7. The column frame and beam frame have the dual functions of positioning and formwork during construction. The installation of the column frame and beam frame can reflect the positioning problems, thereby assisting on-site technicians to make timely adjustments.

[0094] 8. The steel frame can be manufactured on site, changing the transportation mode from "steel plant-prefabrication factory-site" to "steel plant-site", which can save secondary transportation costs.

[0095] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for constructing an independent node assembled frame structure, characterized in that: The steps include: 1) Determine the position of the prefabricated node and place it; the prefabricated node includes a steel frame and a concrete body, the concrete body is provided with a reserved beam frame bracket installation hole, the steel frame includes a main beam steel, a secondary beam steel, a column steel and stirrups, and the two ends of the main beam steel, the secondary beam steel and the column steel are provided with steel thread joints, and the steel thread joints can be mechanically connected with the sleeves on the main beam steel frame, the secondary beam steel frame and the column steel frame; 2) Connect sleeves to the steel bar threaded joints of the main beam steel bar skeleton and the secondary beam steel bar skeleton, and move the main beam steel bar skeleton and the secondary beam steel bar skeleton to between the two prefabricated nodes. Extend the main beam steel bar threaded joints and the secondary beam steel bar threaded joints extending out of the prefabricated nodes into the sleeves respectively and align them with the steel bar threaded joints of the main beam steel bar skeleton and the secondary beam steel bar skeleton, and then rotate and tighten the sleeves in the direction of the prefabricated nodes; 3) installing the main beam frame and the secondary beam frame under the main beam reinforcement skeleton and the secondary beam reinforcement skeleton respectively, wherein the main beam frame and the secondary beam frame are U-shaped groove structures; 4) Pour concrete into the main beam frame and secondary beam frame, and vibrate the concrete; 5) After the initial setting of the concrete in the main beam frame and the secondary beam frame, the floor slab is laid on the frame surrounded by the main beam frame and the secondary beam frame, and a post-casting strip is left in the middle of the floor slabs laid on the frames of the two adjacent spans. After the installation of the floor slabs of the two adjacent spans is completed, concrete is cast in the post-casting strip to make the floor slabs of the two adjacent spans and the frame structure form a whole; 6) Connect the sleeve to the steel bar threaded joint of the column steel bar skeleton, move the column steel bar skeleton to each prefabricated node, insert the column steel bar threaded joint extending above the prefabricated node into the sleeve and align it with the steel bar threaded joint of the column steel bar skeleton, and then rotate and tighten the sleeve in the direction of the prefabricated node; 7) Sleeve the column frame onto the column reinforcement skeleton, wherein the column frame is a thin-walled tube that is sealed on all sides and opened at the top and bottom, and a pouring port is opened on one side of the upper end; 8) Install the upper prefabricated node on the column reinforcement skeleton, specifically: insert the column reinforcement threaded joint extending below the upper prefabricated node into the sleeve above the column reinforcement skeleton and align it with the reinforcement threaded joint inside, then rotate and tighten the sleeve in the direction of the upper prefabricated node; 9) Pour concrete into the column frame through the pouring port and vibrate the concrete. After the concrete pouring is completed, seal the pouring port to prevent leakage. At this time, one frame construction process is completed. Repeat the above steps to complete the next frame construction process.

2. The method for constructing an independent node assembled frame structure according to claim 1, characterized in that: The following steps are also included between step 3) and step 4): 10) Install a detachable beam frame fixing bracket under the steel bar threaded joints extending in all directions of the prefabricated node, and set a supporting device in the middle below the main beam frame and the secondary beam frame.

3. The method for constructing an independent node assembled frame structure according to claim 2, characterized in that: In the step 10), the detachable beam frame fixing bracket is a hollow right-angled triangular prism, and bolts are provided on the smaller right-angled surface of the hollow right-angled triangular prism. The connection between the detachable fixing bracket and the prefabricated node is achieved by the bolts cooperating with the bolt holes reserved on the prefabricated node.

4. The method for constructing an independent node assembled frame structure according to claim 1, characterized in that: In the step 2), the length of each steel bar threaded joint of the main beam steel bar skeleton and the secondary beam steel bar skeleton is half of the sleeve length.

5. The method for constructing an independent node assembled frame structure according to claim 1, characterized in that: In the step 3), the length between the prefabricated nodes at both ends of the main beam frame is 2 cm longer than that of the main beam frame, and the length between the prefabricated nodes at both ends of the secondary beam frame is 2 cm longer than that of the secondary beam frame. After the main beam frame and the secondary beam frame are installed, the joints are sealed with sealing materials to ensure that there is no leakage when pouring concrete.

6. The method for constructing an independent node assembled frame structure according to claim 1, characterized in that: The floor slab in step 5) is an octagon with four chamfered corners.

7. The method for constructing an independent node assembled frame structure according to claim 1, characterized in that: In the step 7), the height of the column frame is 6 cm lower than the total height of the column reinforcement skeleton, and the total height of the column reinforcement skeleton includes the height of the sleeve. After the column reinforcement skeleton is connected to the prefabricated node of the upper layer, the 6 cm gap is sealed with sponge or foam to ensure that there is no leakage when pouring concrete.

8. An independent node assembled frame structure, characterized in that: include: Prefabricated nodes, main beam steel frame, secondary beam steel frame, column steel frame, main beam frame, secondary beam frame and column frame; the prefabricated nodes include steel frame and concrete body, the concrete body is provided with reserved beam frame bracket mounting holes, the steel frame includes main beam steel, secondary beam steel, column steel and stirrups, the two ends of the main beam steel, secondary beam steel and column steel are provided with steel thread joints, and the steel thread joints can be mechanically connected with the sleeves on the main beam steel frame, secondary beam steel frame and column steel frame; The main beam reinforcement skeleton and the secondary beam reinforcement skeleton are arranged between two adjacent prefabricated nodes in the horizontal direction, and the reinforcement threaded joint of the main beam reinforcement skeleton and the main beam reinforcement threaded joint extending out of the prefabricated node are connected by sleeve threads, and the reinforcement threaded joint of the secondary beam reinforcement skeleton and the secondary beam reinforcement threaded joint extending out of the prefabricated node are connected by sleeve threads; the main beam frame and the secondary beam frame are U-shaped groove structures, respectively wrapped around the outer periphery of the main beam reinforcement skeleton and the secondary beam reinforcement skeleton with the groove upward, and concrete is poured in the main beam frame and the secondary beam frame, and the concrete poured in the main beam frame and the secondary beam frame is flush with the upper end surface of the prefabricated node, and a floor slab is laid on the frame surrounded by the main beam frame and the secondary beam frame, and a post-cast strip is provided between the floor slabs laid on the frames of two adjacent spans, and concrete is poured in the post-cast strip; The column reinforcement skeleton is arranged between two adjacent prefabricated nodes in the vertical direction, and the reinforcement threaded joint of the column reinforcement skeleton and the column reinforcement threaded joint extending below the prefabricated node are connected by a sleeve thread; the column frame is a thin-walled tube with an annular seal and upper and lower openings, and concrete is poured in the column frame.

9. The independent node assembled frame structure according to claim 8, characterized in that: It also includes a detachable fixing bracket installed under the steel bar threaded joints extending in all directions of the prefabricated node. The detachable fixing bracket is a hollow right-angled triangular prism. Bolts are provided on the smaller right-angled surface of the hollow right-angled triangular prism. The connection between the detachable fixing bracket and the prefabricated node is achieved by the bolts cooperating with the bolt holes reserved on the prefabricated node.

10. The independent node assembled frame structure according to claim 8, characterized in that: The floor slab is an octagon with four chamfered corners.

Images