Hinged prestress tensioning device and reinforcement method for shield tunnels

Abstract

In shield tunnel construction, there are challenges in construction within narrow, smooth annular structures, insufficient adaptability to tunnel segments of different diameters, and a need for improved construction convenience and equipment versatility. [Solution] The present invention provides a hinged prestress tensioning device and reinforcement method for shield tunnels. The device includes two sets of reinforcing members installed relative to each other, a prestressed pre-stretching member installed between the two reinforcing members, and a prestress bolt installed within the prestressed pre-stretching member. The prestress bolt completes the prestress tensioning on the prestressed pre-stretching member, and both ends are connected to the two sets of reinforcing members via high-strength nuts. By adopting a hinge structure, the reinforcing members can adapt to the angle of the handholes of tunnel segments of different diameters, making it suitable for construction within narrow and smooth annular structures. It improves the convenience of construction and the versatility of the equipment, and is suitable for efficient reinforcement of shield tunnel segments.

Description

Technical Field

[0001] The present invention relates to the field of shield tunnel construction and reinforcement technology, and more specifically, to a hinge-type prestress tensioning device for shield tunnels and a reinforcement method thereof.

Background Art

[0002] In the field of shield tunnel construction and reinforcement, the prestress reinforcement method is an important means to improve the segment structure performance. Currently, there are mainly two technical routes: prestress bracing work and external prestress tensioning devices. The prestress bracing work enhances the rigidity of the segment by applying prestress, but its volume and weight are large, occupying the construction space. Especially under the limited construction conditions in the tunnel, the convenience of operation is greatly restricted. In addition, the prestress bracing work usually causes a certain degree of interference to subsequent water conservancy and power construction, affecting the construction efficiency and progress.

[0003] In contrast, the external prestress tensioning device mainly applies prestress by the post-tensioning method, and transmits the prestress to the structure through subsequent tensioning operations to achieve the reinforcement purpose. However, in a narrow and smooth circular structure such as a shield tunnel, the external prestress tensioning device is inconvenient during construction at the upper part of the circular ring where it is difficult to climb artificially, and it is difficult to adapt to the construction requirements of different tunnel diameters and manhole angles, resulting in low applicability.

[0004] For example, the prestress bracing work technology disclosed in Patent Document 1 can effectively improve the segment rigidity, but it is necessary to arrange a plurality of steel columns, occupying a large amount of space, restricting the construction operation range, and having an adverse impact on subsequent construction processes such as the layout of the water conservancy and power systems. Inside a narrow shield tunnel, the limitations of such a device are particularly prominent.

[0005] Furthermore, Patent Document 2 discloses an external bolt prestress tensioning device for application to tunnel segment joints. This device applies prestress by a post-tensioning method, but it is less convenient when working in areas where artificial manipulation is difficult, such as the upper part of an annular structure. Moreover, this device employs an integrally molded design, making it impossible to adjust to tunnel access hole angles of different diameters, thus limiting its application in various situations.

[0006] Therefore, providing a hinged prestress tensioning device for shield tunnels and a reinforcement method thereof, which can be applied to areas where manual operation is inconvenient and significantly improve construction efficiency and equipment versatility, is an urgent issue that engineers in this field must address. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] CN114263485B [Patent Document 2] CN119145877A [Overview of the project] [Problems that the invention aims to solve]

[0008] The present invention provides a hinged prestress tensioning device for shield tunnels and a reinforcement method thereof, aiming to solve one of the problems of the background art described above, to be applicable to areas where manual operation is inconvenient, and to significantly improve construction efficiency and equipment versatility. [Means for solving the problem]

[0009] To achieve the above objective, the present invention employs the following technical solution: A hinged prestress tensioning device for shield tunnels includes the following: Reinforcement member: Relatively 2 To be installed; Prestressed pre-stretching member: Installed between the two reinforcing members; Prestress bolt: Installed within the prestressed member, completing prestress tensioning on the prestressed member, both ends of the prestress bolt extend beyond the prestressed member, and both ends of the prestress bolt are connected via high-strength nuts. 2 It is connected to the aforementioned reinforcing member.

[0010] Furthermore, each set of reinforcing members includes a connecting rod reaction block, a perforated lug plate, and a connecting rod, wherein the connecting rod reaction block is rotatably mounted on the perforated lug plate via the connecting rod, the ends of the prestress bolts are connected to the connecting rod reaction block via high-strength nuts, and the perforated lug plate is fixed to the shield segment via segment bolts.

[0011] Furthermore, the prestressed pre-stretched member includes clamping steel plates and fixing bolts, two of which are installed, each of which is provided with a pre-screw hole, and the prestress bolts are installed between the two clamping steel plates, and the prestress bolts are connected to the clamping steel plates via wedge-shaped clamps.

[0012] Furthermore, clamping grooves are provided at one end of each of the two clamping steel plates that are in close proximity to each other, and the prestress bolts are installed within these clamping grooves.

[0013] Furthermore, two prestress bolts are installed, the two prestress bolts are installed parallel to each other between the two clamping steel plates, each prestress bolt is connected to the clamping steel plate via a wedge-shaped clamp, and the end of each prestress bolt is connected to the connecting rod reaction block via a high-strength nut. Furthermore, fixing bolts are included, and the two clamping steel plates are detachably connected via the fixing bolts.

[0014] A method for reinforcing a hinged prestress tensioning device for shield tunnels includes the following steps: Step 1: Clamp the prestress bolt between two clamping steel plates and fasten the two clamping steel plates together with fixing bolts; Step 2: Secure both ends of the prestress bolt between the two clamping steel plates via wedge-shaped clamps, and bring the through-type jack into contact with the clamping steel plates to perform prestress tensioning on the prestress bolt. Simultaneously, the wedge-shaped clamps, with their unique wedge-shaped structure, complete the prestressing of the prestress bolt, thus completing the prestress tensioning. Step 3: After prestress tensioning is complete, connect the ends of each prestress bolt to the connecting rod reaction block via high-strength nuts, and secure the perforated lugs to the shield segments via segment bolts, completing the installation of the hinged prestress tensioning device; Step 4: Loosen the fixing bolts and transfer the prestress to the reinforcing member via the fastened high-strength nuts, completing the reinforcement. [Effects of the Invention]

[0015] The above technical solution provides the following advantages compared to conventional technology: The prestress bolt completes the prestress tensioning on the prestressed pre-stretched member, and the prestressed pre-stretched member and the reinforcing member are connected via high-strength nuts, thereby achieving efficient reinforcement of the shield tunnel. The design of the perforated lug plate and connecting rod reaction block solves the problem of insufficient adaptability of the reinforcing member. The combination of wedge-shaped clamps and through-type jacks significantly improves the operational stability and uniformity of the load-bearing force during prestress tensioning, effectively solving the problem of eccentric load-bearing force during the prestressing process and improving the construction quality and safety of the shield tunnel. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic diagram of the structure of a hinge-type prestress tensioning device for shield tunnels according to the present invention. [Figure 2] This is a schematic diagram of the structure of the prestressed pre-stretched member according to the present invention. [Figure 3] This is a schematic diagram illustrating the connection between a prestressed bolt and a wedge-shaped clamp according to the present invention. [Figure 4] This is a schematic diagram of the structure of the reinforcing member according to the present invention. [Figure 5]It is a front view of the reinforcing member according to the present invention. [Figure 6] It is a left side view of the reinforcing member according to the present invention. [Figure 7] It is a bottom view of the reinforcing member according to the present invention. [Figure 8] It is a schematic structural view of the clamping steel plate according to the present invention. [Figure 9] It is a plan view of the clamping steel plate according to the present invention. [Figure 10] It is a left side view of the clamping steel plate according to the present invention. [Figure 11] It is a schematic structural view of the wedge clamp according to the present invention.

Mode for Carrying Out the Invention

[0017] Hereinafter, while referring to the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present invention.

[0018] Referring to FIGS. 1 to 11, the embodiment of the present invention discloses a hinge-type prestress tensioning device for a shield tunnel, including the following: Reinforcing member: The reinforcing members are relatively 2 Installed;

[0019] Prestress pretensioning member: The prestress pretensioning member is installed between two reinforcing members; the reinforcing members can cooperate with the prestress pretensioning member to reinforce the shield tunnel;

[0020] Prestress bolt 6: The prestress bolt 6 is installed in the prestress pretensioning member. The prestress bolt 6 completes prestress tensioning on the prestress pretensioning member. Both ends of the prestress bolt 6 extend beyond the prestress pretensioning member. Both ends of the prestress bolt 6 pass through high-strength nuts 7 2The prestress bolt 6 is connected to the reinforcing member; the prestress bolt 6 completes the prestress tension on the prestressed member and connects the prestressed member and the reinforcing member via the high-strength nut 7, which allows for quick fastening and connection, ensuring long-term stability after prestressing.

[0021] In other cases, each The reinforcing member includes a connecting rod reaction block 2, a perforated lug plate 1, and a connecting rod 8. The connecting rod reaction block 2 is rotatably mounted on the perforated lug plate 1 via the connecting rod 8, the ends of the prestress bolts 6 are connected to the connecting rod reaction block 2 via high-strength nuts 7, and the perforated lug plate 1 is fixed to the shield segment via segment bolts 9. The connecting rod reaction block 2 rotates axially with the perforated lug plate 1 as the fixed end via the connecting rod 8, allowing the reinforcing member to adapt to various different segment handhole angles, effectively solving the problem of eccentric force bearing during the prestressing process. The connecting rod reaction block 2, through its hinge characteristics, uniformly transmits prestress to the shield segment, further increasing the circumferential and longitudinal rigidity of the shield segment. The hinge structure allows for effective adjustment of the installation angle during the construction process, avoiding installation difficulties due to mismatched handhole positions, and adapting to various shield tunnel segment shapes and specifications.

[0022] In this embodiment, the prestressed pre-fastened member includes a clamping steel plate 3 and a fixing bolt 5. Two clamping steel plates 3 are installed, each clamping steel plate 3 is provided with a pre-screw hole 4, and a prestress bolt 6 is installed between the two clamping steel plates 3. The prestress bolt 6 is connected to the clamping steel plate 3 via a wedge-shaped clamp 10. Screws can be selectively screwed into the pre-screw holes 4, resulting in a better fixing action.

[0023] In this embodiment, clamping grooves 11 are provided at one end of each of the two clamping steel plates 3 that are close to each other, and the prestress bolts 6 are installed within the clamping grooves 11; this provides better fixation of the prestress bolts 6.

[0024] In this embodiment, two prestress bolts 6 are installed, and the two prestress bolts 6 are installed parallel to each other between two clamping steel plates 3. Each prestress bolt 6 is connected to the clamping steel plate 3 via a wedge-shaped clamp 10, and the end of each prestress bolt 6 is connected to the connecting rod reaction block 2 via a high-strength nut 7. The wedge-shaped clamp 10 has a unique wedge-shaped structure, and after tension is applied by a through-type jack, the wedge-shaped clamp 10 reliably holds the prestress and ensures reliable transmission of the tension.

[0025] In this embodiment, the clamping steel plates 3 are detachably connected via the fixing bolts 5, which include fixing bolts 5.

[0026] The method for reinforcing a hinged prestress tensioning device for shield tunnels specifically includes the following steps: Step 1: Clamp the prestress bolt 6 with the two clamping steel plates 3 and fasten the two clamping steel plates 3 with the fixing bolts 5; Step 2: The ends of the prestress bolt 6 are fixed between the two clamping steel plates 3 via the wedge-shaped clamp 10, and the through-type jack is brought into contact with the clamping steel plates 3 to perform a prestress tensioning operation on the prestress bolt 6. At the same time, the wedge-shaped clamp 10, with its unique wedge-shaped structure, completes the prestress holding of the prestress bolt 6, thus completing the prestress tensioning; Step 3: After prestress tensioning is complete, the ends of each prestress bolt 6 are connected to the connecting rod reaction block 2 via high-strength nuts 7, and the perforated lugs 1 are fixed to the shield segments via segment bolts 9, completing the installation of the hinged prestress tensioning device; Step 4: Loosen the fixing bolt 5 and transfer the prestress to the reinforcing member via the fastened high-strength nut 7, completing the reinforcement.

[0027] Furthermore, in this embodiment, considering the high humidity and highly corrosive environment inside the shield tunnel, the prestress bolts 6 are made of high-strength steel and treated with an anti-corrosion coating, or composite material bolts are selected to significantly improve their corrosion resistance and long-term stability, thereby guaranteeing the service life of the device.

[0028] The clamping steel plate 3 is pre-filled with screw holes, and the combination of screw holes and fixing bolts 5 allows for quick assembly of the components, improving construction efficiency.

[0029] Each example in this specification is described step-by-step, with each example focusing on its differences from other examples, and identical or similar parts between examples should be referenced to one another. The apparatus disclosed in the examples is described relatively briefly to correspond to the method disclosed in the examples, and relevant parts should be referred to in the description of the method.

[0030] Based on the above description of the disclosed embodiments, those skilled in the art can implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the invention. Accordingly, the present invention is not limited to these embodiments shown herein, but rather fits to the broadest extent that corresponds to the principles and novel features disclosed herein. [Explanation of symbols]

[0031] 1. Ear plate with hole 2-rod reaction block 3 Clamping steel plate 4 spare screw holes 5 Fixing bolts 6. Prestressed bolts 7 High-strength nuts 8 consecutive rods 9-segment bolt 10 Wedge-shaped clamps 11 Holding groove

Claims

1. A hinged prestress tensioning device for a shield tunnel, comprising: two reinforcing members installed relative to each other; a prestress pre-tensioning member installed between the two reinforcing members; and a prestress bolt installed within the prestress pre-tensioning member, completing prestress tensioning on the prestress pre-tensioning member, with both ends extending beyond the prestress pre-tensioning member and both ends connected to the two reinforcing members via high-strength nuts, wherein each of the reinforcing members comprises a connecting rod reaction block, a perforated lug plate and a connecting rod, and the connecting rod reaction block is connected via the connecting rod and the perforated A hinged prestress tensioning device for a shield tunnel, characterized in that it is rotatably mounted on an ear plate, the ends of the prestress bolts are connected to the connecting rod reaction block via high-strength nuts, the perforated ear plate is fixed to the shield segment via segment bolts, the prestress pre-tensioning member includes a clamping steel plate and fixing bolts, two clamping steel plates are installed, each clamping steel plate is provided with a pre-threaded hole, the prestress bolts are installed between the two clamping steel plates, and the prestress bolts are connected to the clamping steel plate via a wedge-shaped clamp.

2. The hinge-type prestress tensioning device for a shield tunnel according to claim 1, characterized in that clamping grooves are provided at one end of the two clamping steel plates that are in close proximity to each other, and the prestress bolts are installed in the clamping grooves.

3. The hinge-type prestress tensioning device for a shield tunnel according to claim 2, characterized in that two prestress bolts are installed, the two prestress bolts are installed parallel to the two clamping steel plates, each prestress bolt is connected to the clamping steel plate via a wedge-shaped clamp, and the end of each prestress bolt is connected to the connecting rod reaction block via a high-strength nut.

4. The hinged prestress tensioning device for a shield tunnel according to claim 3, further comprising fixing bolts, wherein the two clamping steel plates are detachably connected via the fixing bolts.

5. A method for reinforcing a hinged prestress tensioning device for a shield tunnel according to claim 4, comprising the following steps: Step 1: Clamp a prestress bolt between two clamping steel plates and fasten the two clamping steel plates with fixing bolts; Step 2: Fix both ends of the prestress bolt between the two clamping steel plates via wedge-shaped clamps, bring a through-type jack into contact with the clamping steel plates, perform a prestress tensioning operation on the prestress bolt, and at the same time, the wedge-shaped clamp completes the prestress holding of the prestress bolt due to its unique wedge-shaped structure, thus completing the prestress tensioning; Step 3: After the prestress tensioning is completed, connect the ends of each prestress bolt to the connecting rod reaction force block via high-strength nuts, fix the perforated lugs to the shield segment via segment bolts, and complete the installation of the hinged prestress tensioning device; Step 4: Loosen the fixing bolts, transmit the prestress to the reinforcing member via the fastened high-strength nuts, and complete the reinforcement.

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