A beam string main girder structure for formwork support

Abstract

The utility model relates to the technical field of concrete construction, concretely is a kind of beam string main beam structure for formwork support, including channel steel structure, support shaft structure and flexible structure;Channel steel structure is formed by two Q235B hot-rolled ordinary channel steel slot opposite, web bolt fixed whole force section, support shaft structure contains 3 solid steel pipe support axle link and the force transmission support that bolt is fixed in channel steel flange, flexible structure is connected by first slipknot screw rod, positive and negative silk stud, second slipknot screw rod, double-hole lock wire device, galvanized steel wire rope with nylon bushing, flat mouth slipknot bolt in proper order, and flat mouth slipknot bolt connects support axle link piece, the utility model is used for the beam string main beam structure for formwork support, and the amount of steel and tension bolt is reduced by beam string prestress design, realizes component standardization prefabrication and quick assembly, module can be reused to reduce material loss and construction waste, improve construction efficiency, economy and environmental protection, structure is stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of concrete construction technology, specifically a tensioned beam main rib structure for formwork support. Background Technology

[0002] In concrete formwork engineering, formwork support devices are key components for ensuring construction safety and the quality of concrete pouring. Currently, traditional formwork supports mostly use full-span scaffolding, single steel supports, or customized truss structures. Over the long term, these support methods have gradually revealed their incompatibility with modern construction needs, and there is an urgent need for targeted optimization to meet the higher requirements of concrete construction in terms of efficiency, cost, and environmental protection.

[0003] Traditional formwork support systems suffer from several prominent problems: First, they are inefficient. The erection of full-span scaffolding is cumbersome, time-consuming, and labor-intensive, requiring significant manpower and time investment. Customized truss structures, due to their unique structural characteristics, are difficult to assemble on-site, making standardized prefabrication and rapid assembly impossible, severely impacting the overall construction progress. Second, they are costly. Existing formwork construction systems have high requirements for the number of tie bolts and the amount of supporting steel, leading to increased construction costs and hindering economic control. Third, they are not environmentally friendly. The reuse rate of support formwork and components is low, resulting in a large number of waste components after each construction phase. This does not align with the green construction concept advocated by the current construction industry and is detrimental to resource conservation and environmental friendliness. Therefore, in light of these issues, there is an urgent need to develop a tensioned beam main rib structure for formwork support to overcome the shortcomings in current practical applications. Utility Model Content

[0004] The purpose of this utility model is to provide a tensioned beam main rib structure for template support, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A tensioned beam main rib structure for template support includes a channel steel structure, a support shaft structure, and a flexible structure; The channel steel structure consists of two channel steels with their slots facing each other and their webs maintaining a certain distance and being fixed together with bolts. The support shaft structure includes a support shaft member and a force transmission support, and the support shaft member is bolted to the channel steel structure through the force transmission support. The flexible structure is connected to the channel steel structure and the support shaft member respectively to apply prestress to the support shaft member.

[0006] As a further embodiment of this utility model: the channel steel structure is made of Q235B hot-rolled ordinary channel steel, and four holes are evenly opened on the web of the two channel steels. Bolts are passed through the four holes on the web of the channel steel to fix the two channel steels.

[0007] As a further embodiment of this utility model: the support shaft member consists of three solid steel pipes, and both ends of the support shaft member have internal threaded nut structures. The support shaft member is connected to the force transmission support and the flexible structure respectively through the internal threaded nut structures at both ends.

[0008] As a further embodiment of this utility model: the force transmission support is fixed to the flange of the channel steel structure by bolts, and a hole is opened in the middle of the force transmission support. The bolt passes through the hole on the force transmission support to connect the support shaft member to the force transmission support.

[0009] As a further embodiment of this utility model: the flexible structure includes a first swivel screw, a positive and negative threaded stud, a second swivel screw, a steel wire rope, and a flat-mouth swivel bolt; The first swivel bolt and the second swivel bolt are connected by the positive and negative threaded studs, and the first swivel bolt is bolted to the channel steel structure. One end of the wire rope is connected to the second slip knot screw, and the other end of the wire rope is connected to the support shaft member through the flat-mouth slip knot bolt.

[0010] As a further embodiment of this utility model: both the first and second swivel screws are composed of a lifting lug and a screw, and the screw is provided with threads; The positive and negative thread stud is a hollow tubular structure with positive and negative threads at both ends. The screw of the first swivel screw is connected to the positive thread end of the positive and negative thread stud, and the screw of the second swivel screw is connected to the negative thread end of the positive and negative thread stud. The lifting lug of the first swivel bolt is connected to the channel steel bolt, and the lifting lug of the second swivel bolt is inserted into the wire rope.

[0011] As a further embodiment of this utility model: the flexible structure also includes a double-hole locking device, the two ends of the steel wire rope passing through the double holes of the double-hole locking device and folding back, and the steel wire rope being squeezed and fixed by tightening the bolts of the double-hole locking device, wherein the rated locking force of the double-hole locking device is not less than 80% of the breaking tensile force of the steel wire rope.

[0012] As a further embodiment of this utility model: the wire rope is a galvanized wire rope, and the two ends of the wire rope are bolted together to form a rope loop. The rope loop is provided with a nylon bushing, and the entire wire rope is jointless.

[0013] As a further embodiment of this utility model: the flat-mouth slip bolt consists of a head and a screw, the head has a square flat structure, and a through hole is provided in the center of the head, through which the steel wire rope passes; The threaded rod of the flat-mouth swivel bolt is connected to the support shaft member, and the flat-mouth swivel bolt can rotate freely or swing within a small range.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through the prestressed design of the tensioned beam, significantly reduces the amount of supporting steel and lowers material input costs while meeting the requirements of formwork support load and installation. At the same time, all components of the device can be prefabricated in a standardized manner, which greatly simplifies the on-site assembly process, enables rapid assembly, and effectively improves construction efficiency. 2. This utility model can reduce the number of tie bolts, further reduce economic costs, and alleviate the overall cost pressure of the project; moreover, the modules and templates of the device can be reused, and the dismantled parts can be reused in subsequent template projects after cleaning and maintenance, which reduces material consumption and construction waste, conforms to the concept of green construction, and takes into account both economy and environmental protection. 3. In addition, the channel steel structure uses hot-rolled ordinary channel steel of Q235B material with relatively fixed channel openings to form an integral stress-bearing section, ensuring the structural load-bearing stability; the support shaft members are solid steel pipes with internal threaded nuts at both ends, which, together with the force transmission support, can evenly transfer the force to the channel steel structure and avoid local stress concentration; in the flexible structure, the positive and negative threaded studs can adjust the tension stress and overall length of the wire rope, the rated locking force of the double-hole wire lock is not less than 80% of the breaking tensile force of the wire rope, the galvanized steel wire rope with nylon bushing can prevent friction damage, and the flat-mouth slip bolt can rotate freely or swing within a small range to avoid assembly difficulties. The synergistic effect of each component further improves the reliability and practicality of the device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main rib structure of the tensioned beam used for template support according to this utility model.

[0016] Figure 2 This is a structural schematic diagram of the support shaft member in this utility model.

[0017] Figure 3 This is a schematic diagram of the force transmission support in this utility model.

[0018] Figure 4 This is a schematic diagram of the wire rope locking mechanism in this utility model.

[0019] Figure 5 This is a schematic diagram of the flat-mouth slip bolt in this utility model.

[0020] In the diagram: 1-channel steel, 21-support shaft member, 22-force transmission support, 31-first slip knot screw, 32-positive and negative threaded stud, 33-second slip knot screw, 34-double hole locking device, 35-steel wire rope, 36-flat head slip knot bolt. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0023] Please see Figures 1-5 The present invention provides a tensioned beam main rib structure for template support, comprising three core components: a channel steel structure, a support shaft structure, and a flexible structure. The components work together to achieve the stability, efficiency, and environmental protection requirements of template support.

[0024] In one embodiment of this utility model, the channel steel structure consists of two channel steels 1, with their slots facing each other and their webs maintaining a certain distance. According to the "Steel Structure Design Standard" (GB 50017-2017), the web spacing of a double-channel steel lattice section needs to be determined through virtual axis stability calculation. Taking a 5# Q235B channel steel as an example, when the support span is 2.4m and the design load is 20kN / ㎡, the corresponding web spacing is taken as 60mm. The calculated virtual axis gyration radius is 34mm. At this time, the overall section stability coefficient φ≥0.75, which meets the bearing capacity requirements. Both channel steels 1 are made of Q235B hot-rolled ordinary channel steel, and four bolt holes are evenly opened on their webs. The two channel steels 1 are fixed by bolts passing through the holes, so that the channel steel structure forms an integral load-bearing section.

[0025] During the initial stage of construction, when installing the channel steel structure, first place the two channel steels 1 with their slots facing each other, adjust and fix the preset spacing between the webs, and then pass the bolts through the four bolt holes on the webs in sequence, tighten the bolts to ensure that the two channel steels 1 are firmly connected, forming an overall load-bearing structure that can withstand the load of the template.

[0026] The use of hot-rolled ordinary channel steel of Q235B material ensures the basic load-bearing capacity of the channel steel structure. The design of opposite channel openings and bolt fixation makes the structure form an integral stress section, avoiding the problem of uneven stress on individual channel steels. At the same time, the standardized channel steel specifications and pre-set bolt hole positions lay the foundation for subsequent connection with other structures and standardized prefabrication of components.

[0027] In one embodiment of this utility model, the support shaft structure includes a support shaft member 21 and a force transmission support 22. The support shaft member 21 consists of three solid steel pipes with internally threaded nuts at both ends, arranged parallel and at equal intervals along the length of the channel steel structure (i.e., the span direction of the template support). The axis of the middle steel pipe coincides with the center line of symmetry of the channel steel, while the axes of the two side steel pipes are located on either side of the center line of symmetry. The distance between the axes of two adjacent steel pipes is 600mm ± 50mm, forming a plane perpendicular to the web plane of the channel steel structure. The axes of the three steel pipes are in the same vertical plane, ensuring that force is directly transmitted vertically to the channel steel. The force transmission support 22 is fixed to the flange of the channel steel structure by bolts. The force transmission support 22 has a central hole, and one end of the support shaft member 21 passes through the hole in the force transmission support 22 and is bolted to it, thus fixing the support shaft structure to the channel steel structure.

[0028] After the channel steel structure is installed, first fix the force transmission support 22 to the flange of the channel steel 1 with bolts according to the design position. Then, align one end of the support shaft member 21 with the middle hole of the force transmission support 22, insert bolts and tighten them to make the support shaft member 21 and the force transmission support 22 firmly connected, thus completing the installation of the support shaft structure. During the installation process, it is necessary to ensure that the position and spacing of the three support shaft members 21 meet the load distribution requirements.

[0029] The support shaft members 21, made of three solid steel pipes, have strong bending resistance, and the internal threaded nut structure at both ends facilitates quick connection with the force transmission support 22. The force transmission support 22, as a connecting medium, evenly transmits the force of the support shaft members 21 to the channel steel structure, avoiding local stress concentration. At the same time, the modular support shaft structure design reduces the difficulty of on-site assembly and improves construction efficiency.

[0030] In one embodiment of this utility model, please refer to Figure 4 and 5 The flexible structure includes a first slip knot screw 31, a positive and negative threaded stud 32, a second slip knot screw 33, a double-hole wire lock 34, a steel wire rope 35, and a flat-head slip knot bolt 36; wherein: Both the first swivel screw 31 and the second swivel screw 33 consist of a lug and a screw, with the screw portion having threads. The positive and negative thread stud 32 is a hollow tubular structure with positive and negative threads at its two ends, respectively. The screw end of the first swivel screw 31 is connected to the positive thread end of the positive and negative thread stud 32, and the screw end of the second swivel screw 33 is connected to the negative thread end of the positive and negative thread stud 32, thereby realizing the connection between the first swivel screw 31 and the second swivel screw 33. The wire rope 35 is made of galvanized wire rope, and its two ends are bolted together to form rope loops. Nylon bushings are installed inside the rope loops. The entire wire rope 35 is jointless. The lifting lug of the second slip knot screw 33 is inserted into one end of the rope loop of the wire rope 35 to realize the connection between the flexible structure and the second slip knot screw 33. When using the double-hole wire locker 34, both ends of the wire rope 35 pass through the two holes of the double-hole wire locker 34 and are folded back. The wire rope 35 is squeezed and fixed by tightening the bolts of the double-hole wire locker 34. The rated locking force of the double-hole wire locker 34 is not less than 80% of the breaking tensile force of the wire rope 35. The flat-mouth slip bolt 36 consists of a head and a screw. The head has a square flat structure with a through hole in the center. The steel wire rope 35 is inserted into the through hole of the head of the flat-mouth slip bolt 36. The screw end is connected to the internal thread nut structure at both ends of the support shaft member 21 to realize the connection between the flexible structure and the support shaft structure.

[0031] After the support shaft structure is installed, install the flexible structure according to the following steps: First, screw the screw end of the first swivel screw 31 with the positive thread end of the positive and negative thread stud 32, and screw the screw end of the second swivel screw 33 with the negative thread end of the positive and negative thread stud 32 to initially connect the first swivel screw 31, the positive and negative thread stud 32 and the second swivel screw 33. The lifting lug of the first slip knot screw 31 is connected to the preset position of the channel steel structure by bolts, and the lifting lug of the second slip knot screw 33 is inserted into one end of the rope loop of the wire rope 35. Pass both ends of the wire rope 35 through the two holes of the double-hole locking device 34 respectively. After folding the wire rope 35 back, tighten the bolt of the double-hole locking device 34 until the locking force of the double-hole locking device 34 on the wire rope 35 reaches the rated requirement (not less than 80% of the breaking tensile force of the wire rope 35). Insert the head of the flat-mouth swivel bolt 36 through the through hole into the wire rope 35, and screw its screw end into the internal thread nut structure at both ends of the support shaft member 21. Tighten the bolt to ensure a firm connection. During installation, the hole alignment can be adjusted by rotating the head of the flat-mouth swivel bolt 36 (which can rotate freely or swing slightly) to avoid assembly difficulties caused by hole misalignment.

[0032] Therefore, the design of the positive and negative threaded studs 32 allows for length adjustment by rotation, thereby regulating the tension stress of the wire rope 35 and ensuring that the stress on the flexible structure meets the requirements of the template support. The galvanized wire rope 35 has rust-proof capabilities, and the nylon bushing inside the rope loop prevents friction damage between the wire rope 35 and metal parts, extending its service life. The jointless design avoids weak points at the joints. The high rated locking force of the double-hole wire lock 34 ensures the stability of the wire rope 35, while the rotatable head of the flat-mouth slip bolt 36 reduces assembly difficulty and improves on-site construction efficiency. The modular connection of the entire flexible structure with other structures realizes the standardized prefabrication of components, facilitating cleaning, maintenance, and reuse after dismantling, reducing material waste and construction debris.

[0033] In one embodiment of this utility model, please refer to Figures 1-5 After completing the phased installation of the aforementioned channel steel structure, support shaft structure, and flexible structure, the overall construction of the formwork support shall be completed according to the following steps: Template fixing: Fix both ends of the channel steel 1 to the template with tie bolts, and install square timber vertical supports on the outside of the template to further reinforce the template and ensure that the template remains stable during concrete pouring; Prestress Adjustment: By rotating the positive and negative threaded studs 32, a prestress of 80% of the rated breaking strength of the wire rope 35 is applied. The prestress value is indirectly controlled by the correspondence between torque and prestress. Taking an M16 stud of grade 8.8 as an example, when the torque reaches 180-200 N·m, the corresponding prestress is approximately 19-21 kN (i.e., the target prestress for an 8mm wire rope). During on-site operation, place the wrench in the middle of the positive and negative threaded studs 32 and slowly apply torque to the target range. For every 0.1 turn of the M16 stud, the torque increases by approximately 8-10 N·m (under lubrication). Therefore, from the initial state of no torque to the target value, it takes 2.1 to 2.3 turns. During testing, if the torque displayed on the wrench's digital display is within 180-200 N·m and the wire rope is not slack, the prestress is considered to be up to standard. After application, check the verticality and flatness of the template. If it does not meet the design requirements, continue to rotate the positive and negative threaded studs 32 for fine adjustment until the template parameters meet the standards. Acceptance: After the prestressing adjustment is completed, a comprehensive inspection is carried out on the connection firmness, stress state and formwork stability of the entire tensioned beam main rib structure. Once it is confirmed that it meets the construction specifications, the concrete pouring process can begin.

[0034] Once the formwork support is complete (concrete pouring and reaching design strength), dismantle the device following these steps: First, remove the square timber vertical supports on the outside of the formwork; Loosen the positive and negative threaded studs 32 to release the prestress of the wire rope 35; Remove the following components in sequence: flat-mouth slipknot bolt 36, double-hole wire lock 34, steel wire rope 35, second slipknot screw 33, positive and negative thread stud 32, and first slipknot screw 31. Remove the support shaft member 21 and the force transmission support 22; Finally, remove the connecting bolts of the channel steel structure and separate the two channel steels 1; All dismantled components should be cleaned (removing concrete residue, etc.) and maintained (such as rust removal and applying anti-rust paint, etc.). After cleaning, they can be reused in subsequent formwork projects.

[0035] In summary, this utility model, through the coordinated operation of channel steel structure, support shaft structure and flexible structure, combined with the prestressed design of tensioned beams, significantly reduces the amount of supporting steel and the number of tie bolts while meeting the requirements of formwork support load and installation, thus lowering economic costs. At the same time, all components can be standardized and prefabricated, quickly assembled, and reused after dismantling, reducing material waste and construction waste, and effectively improving construction efficiency, economy and environmental protection.

[0036] It should be noted that, in this utility model, unless otherwise explicitly specified and limited, the terms "sliding," "rotating," "fixed," and "equipped" should be interpreted broadly. For example, they can refer to welded connections, bolted connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tensioned beam main rib structure for template support, characterized in that, This includes channel steel structures, support shaft structures, and flexible structures; The channel steel structure consists of two channel steels with their slots facing each other and their webs maintaining a certain distance and being fixed together with bolts. The support shaft structure includes a support shaft member and a force transmission support, and the support shaft member is bolted to the channel steel structure through the force transmission support. The flexible structure is connected to the channel steel structure and the support shaft member respectively to apply prestress to the support shaft member.

2. The tensioned beam main rib structure for template support according to claim 1, characterized in that, The channel steel structure is made of Q235B hot-rolled ordinary channel steel. Four holes are evenly opened on the web of the two channel steels, and bolts are passed through the four holes on the web of the channel steels to fix the two channel steels.

3. The tensioned beam main rib structure for template support according to claim 1, characterized in that, The support shaft member consists of three solid steel pipes, with internal threaded nuts at both ends. The support shaft member is connected to the force transmission support and the flexible structure respectively through the internal threaded nuts at both ends.

4. The tensioned beam main rib structure for template support according to claim 1, characterized in that, The force transmission support is fixed to the flange of the channel steel structure by bolts. The force transmission support has a hole in the middle. The bolt passes through the hole in the force transmission support to connect the support shaft member to the force transmission support.

5. The tensioned beam main rib structure for template support according to claim 1, characterized in that, The flexible structure includes a first slip knot screw, a positive and negative threaded stud, a second slip knot screw, a steel wire rope, and a flat-mouth slip knot bolt; The first swivel bolt and the second swivel bolt are connected by the positive and negative threaded studs, and the first swivel bolt is bolted to the channel steel structure. One end of the wire rope is connected to the second slip knot screw, and the other end of the wire rope is connected to the support shaft member through the flat-mouth slip knot bolt.

6. The tensioned beam main rib structure for template support according to claim 5, characterized in that, Both the first and second swivel screws consist of a lug and a screw, with the screw having threads. The positive and negative thread stud is a hollow tubular structure with positive and negative threads at both ends. The screw of the first swivel screw is connected to the positive thread end of the positive and negative thread stud, and the screw of the second swivel screw is connected to the negative thread end of the positive and negative thread stud. The lifting lug of the first swivel bolt is connected to the channel steel bolt, and the lifting lug of the second swivel bolt is inserted into the wire rope.

7. The tensioned beam main rib structure for template support according to claim 5, characterized in that, The flexible structure also includes a double-hole locking device. The two ends of the steel wire rope pass through the two holes of the double-hole locking device and are folded back. The steel wire rope is squeezed and fixed by tightening the bolts of the double-hole locking device. The rated locking force of the double-hole locking device is not less than 80% of the breaking tensile force of the steel wire rope.

8. The tensioned beam main rib structure for template support according to claim 5, characterized in that, The wire rope is made of galvanized steel wire rope. The two ends of the wire rope are bolted together to form rope loops. The rope loops are fitted with nylon bushings, and the entire wire rope is jointless.

9. The tensioned beam main rib structure for template support according to claim 5, characterized in that, The flat-mouth slip bolt consists of a head and a screw. The head has a square and flat structure, and a through hole is opened in the center of the head. The steel wire rope passes through the through hole. The threaded rod of the flat-mouth swivel bolt is connected to the support shaft member, and the flat-mouth swivel bolt can rotate freely or swing within a small range.

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