Prestressed steel strand reinforced grating arch frame

Abstract

The utility model discloses a prestressed steel strand reinforced grating arch frame, which belongs to the technical field of engineering support and comprises a plurality of steel strands, a plurality of lock bodies and a plurality of grating arch frame components, the plurality of lock bodies are respectively fixedly connected on two sides of the grating arch frame components, and the plurality of grating arch frame components are mutually connected to form the grating arch frame. The grid arch frame component comprises a plurality of grids, and main ribs are fixedly connected to the four corners of the grids in a penetrating mode. The two ends of the lock body are fixedly connected with the corresponding main ribs on the two sides respectively. The steel strand is fixedly connected to the lock body and is fixedly connected with the main rib through the lock body. According to the utility model, the overall structural rigidity is enhanced under the action of prestress, so that the bearing capacity of an early support stage and the resistance to ground pressure deformation are effectively improved. And the distribution and transmission mechanism of the load is also optimized. The stability and durability of the supporting structure are remarkably improved, and the supporting structure has important significance for improving the safety and long-term performance of tunnel engineering.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering support, and particularly relates to a lattice arch reinforced by prestressed steel strands. Background Technique

[0002] In contemporary tunnel engineering practice, the lattice arch, as a key component of the initial support system, has significant application value. Compared with the traditional I-beam arch, the construction process of the lattice arch is more simplified, thus optimizing the convenience of construction operations and significantly improving the efficiency of engineering construction. In addition, from an economic perspective, the lattice arch shows relative advantages in terms of material costs, and combined with its fast construction characteristics, it helps to effectively reduce the total project cost.

[0003] Tunnel excavation activities disturb the original stress state of the stratum, resulting in the redistribution of stresses in the surrounding rock. This stress adjustment may trigger a series of responses in the surrounding rock, including deformation, crack generation, and in extreme cases, local structural instability or collapse. Therefore, the fundamental purpose of implementing tunnel support is to effectively control the mechanical behavior of these surrounding rocks to ensure safety during the construction stage and maintain the long-term structural stability of the tunnel.

[0004] The application of the lattice arch is mainly reflected in the initial support of tunnels, especially in sections with relatively low surrounding rock grades. Thanks to its good flexibility, it can relatively effectively adapt to the formation deformation caused by excavation. However, due to its relatively low overall structural stiffness, in geological environments where higher initial support strength is required to maintain the stability of the excavation face, the lattice arch may not be able to provide sufficient immediate bearing capacity.

[0005] In order to overcome the limitations of the lattice arch in dealing with tunnel deformation and its deficiency in providing initial support strength in current tunnel engineering, a lattice arch reinforced by prestressed steel strands is proposed. Content of the Utility Model

[0006] To solve the above technical problems, the utility model proposes a lattice arch reinforced by prestressed steel strands.

[0007] To achieve the above object, the utility model provides a lattice arch reinforced by prestressed steel strands, comprising:

[0008] A number of steel strands, a number of locking bodies, and a number of lattice arch components, wherein the number of the locking bodies are respectively fixedly connected to both sides of the lattice arch components, and the number of the lattice arch components are connected to each other to form a lattice arch;

[0009] The grid arch frame component includes several grids, and main bars penetrate and are fixedly connected to the four corners of the several grids; both ends of the lock body are fixedly connected to the corresponding main bars on both sides; the steel strand is fixedly connected to the lock body and is fixedly connected to the main bar through the lock body.

[0010] Preferably, the lock body includes a U-shaped lock, a main bar lock, and a connecting rod; there are two main bar locks, which are respectively fixedly connected to both ends of the connecting rod, and the main bar is fixedly connected inside the main bar lock; several U-shaped locks are provided and symmetrically fixedly connected to the connecting rod, and the steel strand is fixedly connected inside the U-shaped lock.

[0011] Preferably, a lock head protrudes from the connecting rod, the width of the lock head is greater than the width of the connecting rod, two bolt holes are provided in the lock head, and the end of the U-shaped lock passes through the two bolt holes and is fastened by a nut; the steel strand is fixed between the U-shaped lock and the lock head.

[0012] Preferably, the main bar lock includes an upper lock buckle and a lower lock buckle, and the upper lock buckle and the lower lock buckle are engaged through an uneven structure. Holes are provided at the engaging positions of the end of the connecting rod, the upper lock buckle, and the lower lock buckle. The connecting rod is inserted into the engaging position from the side so that the holes of the connecting rod correspond to the holes of the upper lock buckle and the lower lock buckle, and a fixing bolt is provided through the holes of the upper lock buckle, the lower lock buckle, and the connecting rod.

[0013] Preferably, raised saw teeth are provided on the inner side of the U-shaped lock.

[0014] Preferably, adjacent grid arch frame components are connected through a connecting ring; an angle steel connecting plate is fixedly connected to the end of the grid arch frame component, a reserved hole is provided on one side of the angle steel connecting plate, and the connecting ring penetrates through the reserved holes on the adjacent two angle steel connecting plates to connect the adjacent two grid arch frame components.

[0015] Preferably, the connecting ring includes a main body and an anchor head. The main body is a ring with a notch, the anchor head is fixedly connected to the notch of the main body, depressions are provided at both ends of the anchor head, the end of the main body is embedded in the depression, and the connection between the main body and the anchor head is fixed by a bolt.

[0016] Preferably, the diameter of the anchor head is greater than the diameter of the reserved hole, and the diameter of the main body is less than the diameter of the reserved hole.

[0017] Compared with the prior art, the present utility model has the following advantages and technical effects:

[0018] 1. The lattice arch is significantly strengthened in its ability to resist deformation caused by the deformation of the surrounding rock masses on both sides through its tight connection and fixation with prestressed steel strands. The lattice arch under prestress has a high structural stiffness, which enables it to exhibit a small deformation amount when bearing loads, thus ensuring that the strength requirements in the early support stage of the tunnel are met and effectively enhancing the safety during the construction process.

[0019] 2. Compared with the traditional I-beam arch, the prestressed lattice arch has a higher customization ability and can be fabricated into various shapes and sizes according to specific design requirements to meet the needs in different engineering environments. In addition, the construction process of the prestressed lattice arch is designed to be more simple and efficient, which helps to reduce the construction time, thereby shortening the construction period and reducing the construction cost while improving the engineering adaptability.

[0020] 3. The integration of the lattice arch and prestressed steel strands significantly enhances the overall performance of the structure. This structural design effectively disperses the loads and promotes their uniform transfer, greatly reducing the possibility of component deformation. By enhancing the overall stability and durability, this combination not only optimizes the mechanical response of the support structure but also improves the safety of the tunnel project and the reliability of long-term service. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0022] Figure 1 is a schematic structural diagram of the lattice arch strengthened by prestressed steel strands of the present utility model;

[0023] Figure 2 is a schematic structural diagram of the lock body in the present utility model;

[0024] Figure 3 is a schematic structural diagram of the top lattice arch component in the present utility model;

[0025] Figure 4 is a folding schematic diagram of the lattice arch strengthened by prestressed steel strands of the present utility model;

[0026] Figure 5 is a schematic structural diagram of the connecting plate and connecting ring in the present utility model;

[0027] Figure 6 is a schematic structural diagram of the connecting ring in the present utility model.

[0028] In the figure: 1. Steel strand; 2. Lock body; 3. Grid arch frame component; 4. U-shaped lock; 401. Convex sawtooth; 5. Main reinforcement lock; 501. Upper locking buckle; 502. Upper locking buckle; 503. Locking buckle shaft; 6. Connecting rod; 7. Lock head; 8. Main reinforcement; 9. Connecting ring; 901. Main body; 902. Anchor head; 10. Angle steel connecting plate. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0031] Refer to Figures 1 to 6 As shown, this embodiment provides a grid arch frame reinforced by prestressed steel strands, including:

[0032] A plurality of steel strands 1, a plurality of lock bodies 2, and a plurality of grid arch frame components 3. A plurality of lock bodies 2 are respectively fixedly connected to both sides of the grid arch frame components 3, and a plurality of grid arch frame components 3 are connected to each other to form a grid arch frame;

[0033] The grid arch frame component 3 includes a plurality of grids, and main reinforcements 8 penetrate and are fixedly connected to the four corners of the plurality of grids; both ends of the lock body 2 are respectively fixedly connected to the corresponding main reinforcements 8 on both sides; the steel strand 1 is fixedly connected to the lock body 2 and is fixedly connected to the main reinforcement 8 through the lock body 2.

[0034] The steel strand 1 is tightly combined with the grid arch frame component 3 through the lock body 2 to achieve the transfer and fixation of prestress. This design optimizes the mechanical properties of the grid arch frame component 3, enhances its overall structural stiffness through the action of prestress, and thus effectively improves the bearing capacity in the early support stage and the resistance to ground pressure deformation. The lock body 2 is respectively fixed on both sides of the grid arch frame component 3 to provide uniform support and stability. At the same time, the synergistic effect of the grid arch frame component 3 and the prestressed steel strand 1 not only enhances the integrity of the structure, but also optimizes the load distribution and transfer mechanism. Such a design significantly improves the stability and durability of the support structure, which is of great significance for improving the safety and long-term performance of tunnel engineering.

[0035] Furthermore, for the grid arch component 3 structure with a larger span, in order to enhance the stability and bearing capacity of the middle part, a lock body 2 can be added to the middle area of ​​the grid arch component 3. This arrangement can more effectively disperse the load and ensure that the entire structure remains balanced and stable when subjected to stress.

[0036] Specifically, when implementing the present invention, the application of the prestressed steel strand 1 needs to be completed with the help of anchors and tensioning equipment. The function of these equipment is to stretch the steel strand 1 to a prestressed level predetermined by the design, thereby introducing prestress into the structure.

[0037] According to a further optimized solution, the lock body 2 includes a U-shaped lock 4, a main reinforcement lock 5 and a connecting rod 6; there are two main reinforcement locks 5, which are respectively fixedly connected to the two ends of the connecting rod 6, and the main reinforcement 8 is fixedly connected to the main reinforcement lock 5; there are several U-shaped locks 4, which are symmetrically fixed to the connecting rod 6, and the steel strand 1 is fixedly connected to the U-shaped lock 4.

[0038] Furthermore, the U-shaped lock 4 is made of high-strength metal material to ensure its performance stability when subjected to tension and pressure.

[0039] To further optimize the solution, a locking head 7 is protruding from the connecting rod 6, the width of the locking head 7 is greater than the width of the connecting rod 6, two bolt holes are opened in the locking head 7, the ends of the U-shaped lock 4 pass through the two bolt holes and are fastened by nuts; the steel wire rope 1 is fixed between the U-shaped lock 4 and the locking head 7.

[0040] By widening the rod body at the lock head 7 on the connecting rod 6, the overall structural strength is significantly improved. This widened design is also of practical value because it provides a larger area for opening bolt holes, thereby facilitating the use of bolts to stably fix the U-shaped lock 4 during installation. The U-shaped lock 4 is passed through the bolt holes preset in the lock head 7. Subsequently, nuts are matched through the bolt holes and the bolts are tightened to achieve a fixed connection between the U-shaped lock 4 and the lock head 7, thereby ensuring the integrity and structural strength of the assembly.

[0041] To further optimize the solution, the main reinforcement lock 5 includes an upper locking buckle 502 and a lower locking buckle, which are engaged with each other through a concave-convex structure, and holes are provided at the end of the connecting rod 6 and the engaging part of the upper locking buckle 502 and the lower locking buckle. The connecting rod 6 is inserted into the engaging part from the side so that the hole of the connecting rod 6 corresponds to the hole of the upper locking buckle 502 and the lower locking buckle, and fixing bolts are arranged through the holes of the upper locking buckle 502, the lower locking buckle and the connecting rod 6.

[0042] The upper locking buckle 502 and the lower locking buckle are connected to the connecting rod 6 through the fixing bolts inserted into the holes thereof, and this mechanism realizes the assembly of the main reinforcement lock 5 and ensures its fixation with the connecting rod 6. This design enables the main reinforcement lock 5 to effectively lock the reinforcement and maintain the stability and integrity of the structural assembly during the construction process.

[0043] Furthermore, one end of the upper locking buckle 502 and the lower locking buckle away from the connecting rod 6 are fixedly connected by bolts.

[0044] Furthermore, the inner sides of the upper locking buckle 502 and the lower locking buckle are precisely machined to form raised traces. This design aims to enhance the biting strength between the locking buckle and the main reinforcement 8, ensuring that the lock body 2 does not slip under stress. By preventing the sliding of the lock body 2, this structure effectively avoids the reduction of the pre-tensioned length of the prestressed steel strand 1, thereby maintaining the stability and effectiveness of the prestress system.

[0045] In a further optimized solution, raised sawteeth 401 are provided inside the U-shaped lock 4.

[0046] This design aims to improve the contact and biting effect with the prestressed steel strand 1, ensuring that the lock can firmly fix the steel strand 1 and effectively transfer and maintain the prestress state.

[0047] In a further optimized solution, adjacent two grid arch frame components 3 are connected by a connecting ring 9; an angle steel connecting plate 10 is fixedly connected to the end of the grid arch frame component 3, a reserved hole is provided on one side of the angle steel connecting plate 10, and the connecting ring 9 passes through the reserved holes on the adjacent two angle steel connecting plates 10 to connect the adjacent two grid arch frame components 3.

[0048] The connecting ring 9 passes through the reserved holes in the angle steel connecting plate 10, in this way to ensure the fixed connection of the upper and lower grid arch frame component assemblies; the connecting ring 9 has sufficient strength to bear the structural load, and the design allows the angle steel connecting plate 10 to freely rotate within a certain angle in the connecting ring 9, so that the upper and lower parts of the grid arch frame component assembly have a certain degree of adaptability and flexibility. The foldable grid arch frame has the ability to quickly unfold and accurately position at the predetermined installation position, significantly improving the efficiency of tunnel arch erection construction; compared with the traditional manual arch erection method, the foldable grid arch frame can effectively reduce the labor intensity of construction personnel due to its convenient design and simplified installation process.

[0049] In a further optimized solution, the connecting ring 9 includes a main body 901 and an anchor head 902. The main body 901 is in a ring shape with a notch, the anchor head 902 is fixedly connected to the notch of the main body 901, depressions are provided at both ends of the anchor head 902, the end of the main body 901 is embedded in the depressions, and the connection between the main body 901 and the anchor head 902 is fixed by bolts.

[0050] During the installation process, first pass the main body 901 through the reserved hole in the angle steel connecting plate 10, and then firmly connect the main body 901 and the anchor head 902 together with bolts.

[0051] In a further optimized solution, the diameter of the anchor head 902 is larger than the diameter of the reserved hole, and the diameter of the main body 901 is smaller than the diameter of the reserved hole.

[0052] To ensure that the main body 901 bears the load of the lattice girder component 3, the diameter of the anchor head 902 of the connecting ring 9 is designed to be slightly larger than the diameter of the reserved hole of the angle steel connecting plate 10 to prevent the anchor head 902 from slipping.

[0053] Deployment of the lattice girder: During the deployment of the folded lattice girder inside the tunnel, first transport the folded lattice girder to the designated position. Subsequently, use professional arch erection equipment to unfold the folded lattice girder and accurately position it at the predetermined installation position.

[0054] The details not elaborated in this utility model are all well-known conventional technical means in the art.

[0055] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this utility model and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this utility model.

[0056] The embodiments described above are only descriptions of the preferred modes of this utility model and do not limit the scope of this utility model. Without departing from the design spirit of this utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of this utility model should all fall within the protection scope determined by the claims of this utility model.

Claims

1. A grid arch reinforced with prestressed steel strands, characterized in that: include: A plurality of steel strands (1), a plurality of lock bodies (2) and a plurality of grille arch components (3), wherein the plurality of lock bodies (2) are respectively fixed to two sides of the grille arch components (3), and the plurality of grille arch components (3) are mutually connected to form a grille arch; The grid arch frame component (3) comprises a plurality of grids, and main bars (8) are fixedly connected through the four corners of the plurality of grids; the two ends of the lock body (2) are respectively fixedly connected to the main bars (8) corresponding to the two sides; the steel strand (1) is fixedly connected to the lock body (2), and is fixedly connected to the main bars (8) through the lock body (2).

2. The grid arch reinforced with prestressed steel strands according to claim 1, characterized in that: The lock body (2) comprises a U-shaped lock (4), a main rib lock (5) and a connecting rod (6); there are two main rib locks (5) which are respectively fixedly connected to the two ends of the connecting rod (6); the main rib (8) is fixedly connected inside the main rib lock (5); a plurality of U-shaped locks (4) are provided which are symmetrically fixedly connected to the connecting rod (6); the steel strand (1) is fixedly connected inside the U-shaped lock (4).

3. The grid arch reinforced with prestressed steel strands according to claim 2, characterized in that: A lock head (7) is protrudingly provided on the connecting rod (6), the width of the lock head (7) is greater than the width of the connecting rod (6), two bolt holes are opened in the lock head (7), the ends of the U-shaped lock (4) pass through the two bolt holes and are fastened by nuts; the steel strand (1) is fixed between the U-shaped lock (4) and the lock head (7).

4. The grid arch reinforced with prestressed steel strands according to claim 2, characterized in that: The main rib lock (5) comprises an upper locking buckle (502) and a lower locking buckle, wherein the upper locking buckle (502) and the lower locking buckle are engaged with each other through a concave-convex structure, and holes are provided at the end of the connecting rod (6) and at the engaging part of the upper locking buckle (502) and the lower locking buckle. The connecting rod (6) is inserted into the engaging part from the side so that the hole of the connecting rod (6) corresponds to the hole of the upper locking buckle (502) and the lower locking buckle, and fixing bolts are provided through the holes of the upper locking buckle (502), the lower locking buckle and the connecting rod (6).

5. The grid arch reinforced with prestressed steel strands according to claim 2, characterized in that: The inner side of the U-shaped lock (4) is provided with raised serrations (401).

6. The grid arch reinforced with prestressed steel strands according to claim 1, characterized in that: Two adjacent grille arch components (3) are connected via a connecting ring (9); an angle steel connecting plate (10) is fixedly connected to the end of the grille arch component (3), a reserved hole is provided on one side of the angle steel connecting plate (10), and the connecting ring (9) passes through the reserved holes on the two adjacent angle steel connecting plates (10) to connect the two adjacent grille arch components (3).

7. The grid arch reinforced with prestressed steel strands according to claim 6, characterized in that: The connecting ring (9) comprises a main body (901) and an anchor head (902); the main body (901) is annular with a notch; the anchor head (902) is fixedly connected to the notch of the main body (901); recesses are provided at both ends of the anchor head (902); the end of the main body (901) is embedded in the recess; the connection between the main body (901) and the anchor head (902) is fixed by bolts.

8. The grid arch reinforced with prestressed steel strands according to claim 7, characterized in that: The diameter of the anchor head (902) is larger than the diameter of the reserved hole, and the diameter of the main body (901) is smaller than the diameter of the reserved hole.

Images