A hinged prestressed tensioning device and its reinforcement method suitable for shield tunnels

Abstract

The present invention discloses an articulated prestressed tensioning device and reinforcement method suitable for shield tunnels. It relates to the technical field of shield tunnel construction and reinforcement, including: a reinforcement component, wherein two groups of the reinforcement components are arranged relatively; a prestressed pre-tensioning component, wherein the prestressed pre-tensioning component is arranged between the two reinforcement components; a prestressed screw, wherein the prestressed screw is arranged in the prestressed pre-tensioning component, wherein the prestressed screw completes prestressing on the prestressed pre-tensioning component, wherein both ends of the prestressed screw extend beyond the prestressed pre-tensioning component, and both ends of the prestressed screw are connected to the two groups of reinforcement components through high-strength nuts. The present invention adopts an articulated structure to enable the reinforcement component to adapt to the hand hole angles of tunnel segments of different diameters, and is suitable for construction in narrow and smooth circular structures; it improves the convenience of construction and the universality of the equipment, and is suitable for efficient reinforcement of shield tunnel segments.

Description

Technical Field

[0001] The invention relates to the technical field of shield tunnel construction and reinforcement, and more particularly to an articulated prestressed tensioning device suitable for a shield tunnel and a reinforcement method thereof. Background Art

[0002] In the field of shield tunnel construction and reinforcement, prestressed reinforcement methods are an important means to improve the structural performance of the segments. Currently, there are two main technical routes: prestressed supports and external prestressed tensioning devices. Among them, prestressed supports enhance the rigidity of the segments by applying prestress, but they are large in size and weight, occupying construction space, and their ease of operation is greatly limited, especially under limited construction conditions in the tunnel. In addition, prestressed supports usually cause a certain degree of interference to subsequent water conservancy and power construction, thereby affecting project efficiency and construction progress.

[0003] In contrast, external prestressing tensioning devices mostly use the post-tensioning method to apply prestress, which transfers the prestress to the structure through subsequent tensioning operations to achieve the purpose of reinforcement. However, in the narrow and smooth circular structure of shield tunnels, the external prestressing tensioning device is inconvenient to construct on the upper part of the circular ring where it is difficult to climb manually, and it is difficult to adapt to the construction requirements of different tunnel diameters and hand hole angles, and its applicability is low.

[0004] For example, the prestressed support technology disclosed in the invention patent CN114263485B can effectively improve the rigidity of the pipe segment, but it requires the deployment of multiple steel supports, which takes up a lot of space, limits the scope of construction operations, and has an adverse impact on the subsequent construction links such as the deployment of water conservancy and power systems. The limitations of using such devices are particularly prominent inside narrow shield tunnels.

[0005] For another example, the invention patent CN119145877A discloses an external bolt prestressing tensioning device suitable for tunnel segment joints. The device uses the post-tensioning method to apply prestress, but its convenience is poor when constructing in areas that are difficult to operate manually, such as the upper part of the ring. In addition, the device adopts an integrated molding design and cannot be adjusted to adapt to the hand hole angles of tunnels with different diameters, thus limiting its application in various scenarios.

[0006] Therefore, how to provide an articulated prestressed tensioning device and its reinforcement method suitable for shield tunnels that is suitable for areas where manual operation is inconvenient, thereby significantly improving construction efficiency and the universality of equipment is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0007] In view of this, the present invention provides an articulated prestressed tensioning device suitable for shield tunnels and a reinforcement method thereof, aiming to solve one of the problems in the above-mentioned background technology, and is suitable for areas where manual operation is inconvenient, thereby significantly improving construction efficiency and the universality of the equipment.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] An articulated prestressed tensioning device suitable for a shield tunnel, comprising:

[0010] A reinforcement component, wherein two groups of the reinforcement components are arranged opposite to each other;

[0011] A prestressed pre-tensioning component, wherein the prestressed pre-tensioning component is arranged between the two reinforcement components;

[0012] A prestressed screw rod, wherein the prestressed screw rod is arranged in the prestressed pre-tensioning component, the prestressed screw rod completes prestressing tensioning on the prestressed pre-tensioning component, both ends of the prestressed screw rod exceed the prestressed pre-tensioning component, and both ends of the prestressed screw rod are connected to the two groups of reinforcement components through high-strength nuts.

[0013] Furthermore, each group of the reinforcement components includes a connecting rod reaction block, a perforated ear plate and a connecting rod. The connecting rod reaction block is rotatably arranged on the perforated ear plate through the connecting rod. The end of the prestressed screw is connected to the connecting rod reaction block through a high-strength nut, and the perforated ear plate is fixed to the shield segment through segment bolts.

[0014] Furthermore, the prestressed pre-tensioning assembly includes a clamping steel plate and a fixing bolt. Two clamping steel plates are provided, each of the clamping steel plates is provided with a reserved screw hole, and the prestressed screw is arranged between the two clamping steel plates. The prestressed screw is connected to the clamping steel plates through a wedge-shaped clip.

[0015] Furthermore, a clamping groove is provided at one end of the two clamping steel plates close to each other, and the prestressed screw is arranged in the clamping groove.

[0016] Furthermore, two prestressed screws are provided, and the two prestressed screws are arranged in parallel between the two clamping steel plates, each of the prestressed screws is connected to the clamping steel plates through a wedge-shaped clip, and the end of each prestressed screw is connected to the connecting rod reaction block through a high-strength nut.

[0017] Furthermore, it also includes a fixing bolt, and the two clamping steel plates are detachably connected through the fixing bolt.

[0018] A method for reinforcing an articulated prestressed tensioning device suitable for a shield tunnel comprises the following steps:

[0019] Step 1: Clamp the prestressed screw rod with two clamping steel plates, and lock the two clamping steel plates with fixing bolts;

[0020] Step 2: Both ends of the prestressed screw are fixed between two clamping steel plates by wedge-shaped clips, and a through-type jack is used to press against the clamping steel plates to perform prestressing tensioning on the prestressed screw. At the same time, the wedge-shaped clip completes the prestressing load on the prestressed screw through its unique wedge-shaped structure, and the prestressing tensioning is completed;

[0021] Step 3: After the prestressing is completed, the end of each prestressing screw is connected to the connecting rod reaction block through a high-strength nut, and the ear plate with holes is fixed to the shield segment through the segment bolts, and the articulated prestressing tensioning device is installed;

[0022] Step 4: Loosen the fixing bolts so that the prestress is transferred to the reinforced components through the locked high-strength nuts, and the reinforcement is completed.

[0023] It can be seen from the above technical scheme that, compared with the prior art, the present invention discloses an articulated prestressed tensioning device suitable for shield tunnels and a reinforcement method thereof, wherein prestressed tensioning is completed on a prestressed pre-tensioning assembly through a prestressed screw, and then the prestressed pre-tensioning assembly and the reinforcement assembly are connected through a high-strength nut, thereby realizing efficient reinforcement of the shield tunnel; the problem of poor adaptability of the reinforcement assembly is solved by adopting the design of perforated ear plates and connecting rod reaction blocks; the operational stability and force uniformity of the prestressed tensioning are significantly improved by cooperating with a wedge-shaped clip and a through-type jack, thereby effectively solving the problem of force eccentricity during the prestressing process, thereby improving the construction quality and safety of the shield tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of an articulated prestressed tensioning device suitable for a shield tunnel provided by the present invention;

[0026] Figure 2 A schematic diagram of the structure of the prestressed pre-tensioning assembly provided by the present invention;

[0027] Figure 3 A schematic diagram of the connection between the prestressed screw rod and the wedge-shaped clip provided by the present invention;

[0028] Figure 4A schematic diagram of the structure of the reinforcement assembly provided by the present invention;

[0029] Figure 5 A front view of the reinforcement assembly provided by the present invention;

[0030] Figure 6 A left side view of the reinforcement assembly provided by the present invention;

[0031] Figure 7 A bottom view of the reinforcement assembly provided by the present invention;

[0032] Figure 8 A schematic diagram of the structure of the clamping steel plate provided by the present invention;

[0033] Fig. 9 A top view of the clamping steel plate provided by the present invention;

[0034] Fig.10 A left side view of the clamping steel plate provided by the present invention;

[0035] Fig.11 This is a schematic structural diagram of the wedge-shaped clip provided by the present invention.

[0036] Among them: 1 is a perforated ear plate; 2 is a connecting rod reaction block; 3 is a clamping steel plate; 4 is a reserved screw hole; 5 is a fixing bolt; 6 is a prestressed screw; 7 is a high-strength nut; 8 is a connecting rod; 9 is a segment bolt; 10 is a wedge-shaped clip; 11 is a clamping groove. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-11 The embodiment of the present invention discloses an articulated prestressed tensioning device suitable for a shield tunnel, comprising:

[0039] A reinforcement component, wherein two groups of reinforcement components are arranged relatively;

[0040] Prestressed pre-tensioning components, which are arranged between two reinforcement components; the reinforcement components can cooperate with the prestressed pre-tensioning components to reinforce the shield tunnel;

[0041] Prestressed screw 6, prestressed screw 6 is arranged in the prestressed pre-tensioning component, the prestressed screw 6 completes prestressed tensioning on the prestressed pre-tensioning component, both ends of the prestressed screw 6 exceed the prestressed pre-tensioning component, and the two ends of the prestressed screw 6 are connected to the two groups of reinforcement components through high-strength nuts 7; the prestressed screw 6 completes prestressed tensioning on the prestressed pre-tensioning component, and then connects the prestressed pre-tensioning component and the reinforcement component through the high-strength nuts 7, and the high-strength nuts 7 can quickly lock the connection to ensure long-term stability after the prestress is applied.

[0042] In this embodiment, each group of reinforcement components includes a connecting rod reaction block 2, a perforated ear plate 1 and a connecting rod 8. The connecting rod reaction block 2 is rotatably set on the perforated ear plate 1 through the connecting rod 8. The end of the prestressed screw 6 is connected to the connecting rod reaction block 2 through a high-strength nut 7. The perforated ear plate 1 is fixed to the shield segment through a segment bolt 9; the connecting rod reaction block 2 is rotated around the axis with the perforated ear plate 1 as the fixed end through the connecting rod 8, so that the reinforcement component can adapt to various different segment hand hole angles and effectively solve the problem of eccentric force during the prestressing process. The connecting rod reaction block 2 transfers the prestress evenly to the shield segment through its hinged characteristics, further enhancing the circumferential and longitudinal stiffness of the shield segment; the hinged structure can effectively adjust the installation angle during the construction process, avoid installation difficulties caused by mismatching the hand hole positions, and adapt to various shapes and specifications of shield tunnel segments.

[0043] In this embodiment, the prestressed pre-tensioning assembly includes a clamping steel plate 3 and a fixing bolt 5. Two clamping steel plates 3 are provided, each clamping steel plate 3 is provided with a reserved screw hole 4, and a prestressed screw 6 is arranged between the two clamping steel plates 3. The prestressed screw 6 is connected to the clamping steel plate 3 through a wedge-shaped clip 10; the reserved screw hole 4 can be selectively screwed into a screw to achieve a better fixing effect.

[0044] In this embodiment, a clamping groove 11 is provided at one end of the two clamping steel plates 3 close to each other, and the prestressed screw 6 is arranged in the clamping groove 11 to better fix the prestressed screw 6.

[0045] In this embodiment, two prestressed screw rods 6 are provided, and the two prestressed screw rods 6 are arranged in parallel between two clamping steel plates 3. Each prestressed screw rod 6 is connected to the clamping steel plate 3 through a wedge-shaped clip 10, and the end of each prestressed screw rod 6 is connected to the connecting rod reaction block 2 through a high-strength nut 7; the wedge-shaped clip 10 has a unique wedge-shaped structure. After the tensioning force is applied by the through-type jack, the wedge-shaped clip 10 can firmly hold the prestressing force to ensure the reliable transmission of the tensioning force.

[0046] In this embodiment, a fixing bolt 5 is further included, and the two clamping steel plates 3 are detachably connected via the fixing bolt 5 .

[0047] A reinforcement method for an articulated prestressed tensioning device suitable for a shield tunnel comprises the following steps:

[0048] Step 1: Clamp the prestressed screw 6 with two clamping steel plates 3, and lock the two clamping steel plates 3 with fixing bolts 5;

[0049] Step 2: Both ends of the prestressed screw rod 6 are fixed between the two clamping steel plates 3 by means of a wedge-shaped clip 10, and a through-type jack is used to press against the clamping steel plates 3 to perform prestress tensioning operation on the prestressed screw rod 6. At the same time, the wedge-shaped clip 10 completes the prestressing of the prestressed screw rod 6 through its unique wedge-shaped structure, and the prestress tensioning is completed;

[0050] Step 3: After the prestressing is completed, the end of each prestressing screw rod 6 is connected to the connecting rod reaction block 2 through a high-strength nut 7, and the perforated ear plate 1 is fixed to the shield segment through the segment bolt 9, and the articulated prestressing tensioning device is installed;

[0051] Step 4: Loosen the fixing bolt 5 so that the prestress is transferred to the reinforcement component through the locked high-strength nut 7, and the reinforcement is completed.

[0052] In addition, in this embodiment, considering the high humidity and highly corrosive environment inside the shield tunnel, the prestressed screw 6 adopts a high-strength steel screw and is treated with an anti-corrosion coating, or a composite material screw is selected to significantly improve its corrosion resistance and long-term stability, thereby ensuring the service life of the device.

[0053] The clamping steel plate 3 is provided with threaded holes, and the assembly of the components can be completed quickly through the threaded holes and the fixing bolts 5, thereby improving the construction efficiency.

[0054] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0055] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An articulated prestressed tensioning device suitable for a shield tunnel, characterized in that: include: A reinforcement component, wherein two groups of the reinforcement components are arranged opposite to each other; A prestressed pre-tensioning component, wherein the prestressed pre-tensioning component is arranged between the two reinforcement components; A prestressed screw rod, wherein the prestressed screw rod is arranged in the prestressed pre-tensioning assembly, the prestressed screw rod completes prestressing on the prestressed pre-tensioning assembly, both ends of the prestressed screw rod exceed the prestressed pre-tensioning assembly, and both ends of the prestressed screw rod are connected to the two groups of reinforcement assemblies through high-strength nuts; Each group of the reinforcement components includes a connecting rod reaction block, a perforated ear plate and a connecting rod, wherein the connecting rod reaction block is rotatably arranged on the perforated ear plate through the connecting rod, the end of the prestressed screw is connected to the connecting rod reaction block through a high-strength nut, and the perforated ear plate is fixed to the shield segment through segment bolts; The prestressed pre-tensioning assembly includes a clamping steel plate and a fixing bolt. Two clamping steel plates are provided, each of which is provided with a reserved screw hole. The prestressed screw is arranged between the two clamping steel plates, and the prestressed screw is connected to the clamping steel plates through a wedge-shaped clip.

2. The articulated prestressed tensioning device suitable for a shield tunnel according to claim 1, characterized in that: A clamping groove is provided at one end of the two clamping steel plates close to each other, and the prestressed screw is arranged in the clamping groove.

3. The articulated prestressed tensioning device suitable for a shield tunnel according to claim 2, characterized in that: Two prestressed screws are provided, and the two prestressed screws are arranged in parallel between the two clamping steel plates. Each prestressed screw is connected to the clamping steel plate through a wedge-shaped clip, and the end of each prestressed screw is connected to the connecting rod reaction block through a high-strength nut.

4. The articulated prestressed tensioning device suitable for a shield tunnel according to claim 3, characterized in that: It also includes a fixing bolt, through which the two clamping steel plates are detachably connected.

5. A reinforcement method for an articulated prestressed tensioning device suitable for a shield tunnel, according to claim 4, characterized in that: The specific steps include: Step 1: Clamp the prestressed screw rod with two clamping steel plates, and lock the two clamping steel plates with fixing bolts; Step 2: Both ends of the prestressed screw are fixed between two clamping steel plates by wedge-shaped clips, and a through-type jack is used to press against the clamping steel plates to perform prestressing tensioning on the prestressed screw. At the same time, the wedge-shaped clip completes the prestressing load on the prestressed screw through its unique wedge-shaped structure, and the prestressing tensioning is completed; Step 3: After the prestressing is completed, the end of each prestressing screw is connected to the connecting rod reaction block through a high-strength nut, and the ear plate with holes is fixed to the shield segment through the segment bolts, and the articulated prestressing tensioning device is installed; Step 4: Loosen the fixing bolts so that the prestress is transferred to the reinforced components through the locked high-strength nuts, and the reinforcement is completed.

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