Variable cross-section assembled shield tunnel bending bolt and use method thereof

Abstract

The application discloses a variable cross-section assembled shield tunnel bent bolt and a using method thereof, and belongs to the technical field of shield tunnel construction. The bolt comprises an assembled bolt variable cross-section unit, a bolt assembling surface connecting unit, an assembled bolt constant cross-section unit and a bolt fastener. The bolt assembling surface connecting unit is used for connecting two bolts and internally provided with a bonding agent. The bolt fastener is assembled on the assembled bolt variable cross-section unit, and tightly holds the inserted assembled bolt constant cross-section unit under the action of an elastic member, so that the two bolts are tightly matched. The application can effectively solve the bolt assembly difficulty problem caused by the position deviation of screw holes between segments, avoid the bolt shedding phenomenon in a period of time after bolt assembly, fully exert the bending and shearing resistance performance of the bent bolt, reduce the deformation of the shield tunnel, and guarantee the safe operation of trains.

Description

Technical Field

[0001] This invention belongs to the field of rail transit segment joint bolts, and is a variable cross-section assembled shield tunnel bent bolt and its application method. Background Technology

[0002] With the development of cities and the utilization of underground space in my country, the number of shield tunnels that have been built or are under construction has increased significantly. During shield tunnel construction, slight deviations between segments are inevitable due to factors such as segment manufacturing and installation. This leads to insufficient tightness in the connection between segments, making the installation of traditional bolts difficult and affecting the tunnel's service life and safety. Furthermore, traditional bolts are prone to detachment after a period of use due to external environmental forces and train vibrations. The existence of segment joint bolts is to ensure the firmness and safety of the segment connection, providing bending and shear resistance and preventing segment loosening or detachment. During construction, the installation of traditional bolts is difficult, requiring significant manpower, resources, and effort, and can easily damage the plain concrete of the segments during installation. Therefore, inventing a bolt that is easy to install during construction without compromising its bending resistance has become an urgent need in the industry. Summary of the Invention

[0003] To address the difficulties in bolt installation during current construction processes, the present invention aims to provide a variable cross-section prefabricated shield tunnel bent bolt. By sequentially installing prefabricated bolt variable cross-section units, prefabricated bolt constant cross-section units, bolt assembly surface connection units, bolt fasteners, and springs, the bent bolt is ensured to be easy to install and possesses excellent bending resistance, while effectively preventing bolt detachment.

[0004] This invention is achieved using the following technical solution: A variable cross-section assembled shield tunnel bent bolt, comprising: The assembly bolt variable cross-section unit has one end face diameter larger than the other end face diameter. The larger diameter end face is provided with a circular groove and a circular annular groove surrounding the circular groove. Multiple fasteners are provided in the circular annular groove. The bolt assembly surface connection unit is located in the circular groove and has a larger cylindrical cavity, a smaller cylindrical cavity, and multiple cylindrical channels. The smaller cylindrical cavity is located on the end face of the bolt assembly surface connection unit, the larger cylindrical cavity is connected to the bottom of the smaller cylindrical cavity, and the multiple cylindrical channels are located on the other end face of the bolt assembly surface connection unit and communicate with the larger cylindrical cavity. The assembly bolt constant section unit has a circular groove on its peripheral wall. One end of the assembly bolt constant section unit extends into the larger cylindrical cavity. The circular groove is located at the smaller cylindrical cavity. The cavity wall of the smaller cylindrical cavity prevents the assembly bolt constant section unit from detaching. An adhesive is placed inside the larger cylindrical cavity and enters the circular groove through the cylindrical channel to bond the variable cross-section unit of the assembly bolt, the bolt assembly surface connection unit, and the constant cross-section unit of the assembly bolt. Multiple bolt fasteners are slidably fitted onto the fixing member, and the bolt fasteners are elastically supported by an elastic member to extend and lock the bolt assembly surface connection unit.

[0005] Furthermore, the number of the fasteners is four, and they are evenly spaced in the annular groove; The bolt fastener includes a connecting part and a locking part. The connecting part is slidably sleeved on the fixing member. The locking part is vertically connected to the connecting part. The end of the locking part extends to the circular groove to lock the bolt assembly surface connecting unit.

[0006] Furthermore, from the center of the bolt assembly surface connecting unit end face to the edge, the number of multiple small cylindrical channels gradually increases, and the radius of each small cylindrical channel gradually decreases.

[0007] Furthermore, the height of the smaller cylindrical cavity is greater than the height of the annular groove, allowing the bolt assembly surface connection unit and the assembly bolt constant cross-section unit to move relative to each other within a certain range.

[0008] Furthermore, the circular groove, the annular groove, and the bolt assembly surface connection unit are all at the same height.

[0009] Furthermore, the diameter of the variable cross-section unit of the assembly bolt on the bolt assembly surface is greater than the diameter of the constant cross-section unit of the assembly bolt on the bolt assembly surface.

[0010] This invention also provides a method for using variable cross-section assembled shield tunnel bent bolts, including: Provides a bolted variable cross-section unit, with elastic elements and bolt fasteners respectively fitted on its fixing parts, and assembles it onto the corresponding pipe segments; Assemble the tunnel segments; Provides a constant section unit for assembly bolts and a connection unit for bolt assembly surfaces. The end of the constant section unit for assembly bolts is inserted into the larger cylindrical cavity, and an adhesive is added to the larger cylindrical cavity. Compress the elastic element to open multiple bolt fasteners, insert the bolt assembly surface connection unit into the circular groove, and release the elastic element to push the multiple bolt fasteners to lock the bolt assembly surface connection unit. The constant cross-section unit of the assembly bolt undergoes piston movement within the bolt assembly surface connection unit, squeezing the adhesive from the larger cylindrical cavity out through multiple smaller cylindrical channels, thereby bonding the variable cross-section unit of the assembly bolt, the bolt assembly surface connection unit, and the constant cross-section unit of the assembly bolt. Beneficial effects

[0011] This invention relates to a variable cross-section assembled shield tunnel bent bolt. Compared with the prior art, this invention sequentially installs an assembled bolt variable cross-section unit, an assembled bolt constant cross-section unit, a bolt assembly surface connection unit, and a bolt fastener and spring connection, ensuring that the bent bolt is easy to install and has good bending resistance, while effectively avoiding the problem of bolt falling off. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0013] Figure 1 This is a schematic diagram of a variable cross-section assembled shield tunnel bent bolt according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the assembly bolt variable cross-section unit according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the constant cross-section unit of the assembly bolts according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the bolt assembly surface connection unit according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a bolt fastener according to an embodiment of the present invention; Figure label: 1. Variable cross-section unit for assembled bolts; 2. Constant cross-section unit for assembled bolts; 3. Bolt assembly surface connection unit; 4. Bolt fastener; 5. Spring; 6. Cylinder; 7. Small cylindrical channel; 8. Circular groove; 9. Circular groove; 10. Larger cylindrical cavity; 11. Smaller cylindrical cavity; 12. Circular pit / groove Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0015] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific examples. Example

[0017] Please see Figure 1-5 In this embodiment, an 8.8 grade high-strength bent bolt is used. The diameter of the assembly surface of the bolt variable cross-section unit is 60mm, the diameter of the circular groove is 40mm, and the diameter of the bolt assembly surface connection unit is 30mm. Therefore, there is a 10mm error margin in the assembly of the bolt assembly surface connection unit. The diameter of the circular groove is between 44mm and 56mm, the diameter of the larger cylindrical cavity is 28mm, the diameter of the smaller cylindrical cavity is 24mm, the height of the circular groove, the circular groove, and the bolt assembly surface connection unit is 10mm, and the spring fastener elongates by 9mm. Figure 1 As shown, within the error range, all constant section units of the assembly bolts can be held in place by spring fasteners, achieving a tight connection.

[0018] The variable cross-section unit and the constant cross-section unit of the assembled bolts are tightly connected through the bolt assembly surface connection unit, bolt fasteners and springs.

[0019] The cross-sectional diameter of the assembly bolt variable cross-section unit gradually changes from small to large. The diameter of the bolt assembly face is larger than the diameter of the other end face. A circular groove with a radius slightly larger than the diameter of the constant cross-section unit of the assembly bolt on the bolt assembly face is dug in the middle of the large diameter end face. At the same time, a circular annular groove is opened around the circular groove. Four cylinders are set in four directions inside the circular annular groove to accommodate the bolt fasteners and springs.

[0020] The bolt-assembly surface connection unit is a cylinder with a cross-sectional radius slightly smaller than the radius of the circular groove. Inside the cylinder, there is a larger cylindrical cavity and a smaller cylindrical cavity. The larger cylindrical cavity has multiple small cylindrical channels connecting to the assembly surface cross-section, and the smaller cylindrical cavity is connected to the other end face. During assembly, a chemical adhesive is injected into the larger cylindrical cavity.

[0021] The radius of the assembly surface of the bolt constant section unit is slightly smaller than the radius of the circular groove and slightly smaller than the radius of the bolt assembly surface connection unit. It is consistent with the radius of the larger cylindrical cavity within the bolt assembly surface connection unit. A circular groove is formed on the end face, with its height and radius consistent with the smaller cylindrical cavity. The radius of the other end face of the bolt constant section unit is consistent with the radius of the bolt assembly surface connection unit, and the radius remains unchanged.

[0022] The bolt fastener is made of steel, and the radius of the bolt fastener ring is slightly larger than the radius of the cylinder, and it fits onto the cylinder.

[0023] Within the circular groove area, all bolt-assembled connection units can be secured by bolt fasteners for a tight connection.

[0024] The constant section unit of the assembly bolt moves like a piston within the bolt assembly surface connection unit, which can squeeze the chemical adhesive in the larger cylindrical cavity out from multiple smaller cylindrical channels to achieve the bonding purpose.

[0025] The bolts are fitted onto four cylinders and connected to the bolt variable cross-section unit and bolt fasteners. The springs can adjust the position of the bolt fasteners according to the position of the bolt assembly surface connection unit.

[0026] The variable cross-section assembly bolt unit is assembled first through the large hole before the segment assembly, and then assembled after the segment assembly, with the constant cross-section assembly bolt unit in order to prevent it from falling off.

[0027] The circular groove, the annular groove, and the bolt assembly surface connection unit are all at the same height.

[0028] In the bolt-assembled surface connection unit, the radius of multiple small cylindrical channels gradually decreases from the center to the periphery, but the number gradually increases, and they are arranged radially, which is conducive to the uniform distribution of chemical adhesive.

[0029] The spring is initially in a compressed state, and the bolt fastener connected to it is in an open state. After the constant section unit of the assembled bolt is assembled, the spring is depressurized, and the bolt fastener locks the constant section unit of the assembled bolt.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A variable cross-section assembled shield tunnel bent bolt, characterized in that, include: The assembly bolt variable cross-section unit has one end face diameter larger than the other end face diameter. The larger diameter end face is provided with a circular groove and a circular annular groove surrounding the circular groove. Multiple fasteners are provided in the circular annular groove. The bolt assembly surface connection unit is located in the circular groove and has a larger cylindrical cavity, a smaller cylindrical cavity, and multiple cylindrical channels. The smaller cylindrical cavity is located on the end face of the bolt assembly surface connection unit, the larger cylindrical cavity is connected to the bottom of the smaller cylindrical cavity, and the multiple cylindrical channels are located on the other end face of the bolt assembly surface connection unit and communicate with the larger cylindrical cavity. The assembly bolt constant section unit has a circular groove on its peripheral wall. One end of the assembly bolt constant section unit extends into the larger cylindrical cavity. The circular groove is located at the smaller cylindrical cavity. The cavity wall of the smaller cylindrical cavity prevents the assembly bolt constant section unit from detaching. An adhesive is placed inside the larger cylindrical cavity and enters the circular groove through the cylindrical channel to bond the variable cross-section unit of the assembly bolt, the bolt assembly surface connection unit, and the constant cross-section unit of the assembly bolt. Multiple bolt fasteners are slidably fitted onto the fixing member, and the bolt fasteners are elastically supported by an elastic member to extend and lock the bolt assembly surface connection unit.

2. The variable cross-section assembled shield tunnel bent bolt according to claim 1, characterized in that, The number of fasteners is four, and they are evenly spaced in the annular groove; The bolt fastener includes a connecting part and a locking part. The connecting part is slidably sleeved on the fixing member. The locking part is vertically connected to the connecting part. The end of the locking part extends to the circular groove to lock the bolt assembly surface connecting unit.

3. The variable cross-section assembled shield tunnel bent bolt according to claim 1, characterized in that, From the center of the bolt assembly surface connecting unit end face to the edge, the number of multiple small cylindrical channels gradually increases, and the radius of each small cylindrical channel gradually decreases.

4. The variable cross-section assembled shield tunnel bent bolt according to claim 1, characterized in that, The height of the smaller cylindrical cavity is greater than the height of the annular groove, allowing the bolt assembly surface connection unit and the assembly bolt constant cross-section unit to move relative to each other within a certain range.

5. A variable cross-section assembled shield tunnel bent bolt according to claim 1, characterized in that, The circular groove, the annular groove, and the bolt assembly surface connection unit are all at the same height.

6. A variable cross-section assembled shield tunnel bent bolt according to claim 1, characterized in that, The diameter of the variable cross-section unit of the assembly bolt on the bolt assembly surface is greater than the diameter of the constant cross-section unit of the assembly bolt on the bolt assembly surface.

7. A method for using a variable cross-section assembled shield tunnel bent bolt as described in claim 1, characterized in that, include: Provides a bolted variable cross-section unit, with elastic elements and bolt fasteners respectively fitted on its fixing parts, and assembles it onto the corresponding pipe segments; Assemble the tunnel segments; Provides a constant section unit for assembly bolts and a connection unit for bolt assembly surfaces. The end of the constant section unit for assembly bolts is inserted into the larger cylindrical cavity, and an adhesive is added to the larger cylindrical cavity. Compress the elastic element to open multiple bolt fasteners, insert the bolt assembly surface connection unit into the circular groove, and release the elastic element to push the multiple bolt fasteners to lock the bolt assembly surface connection unit. The constant cross-section unit of the assembly bolt undergoes piston movement within the bolt assembly surface connection unit, squeezing the adhesive from the larger cylindrical cavity out through multiple smaller cylindrical channels, thereby bonding the variable cross-section unit of the assembly bolt, the bolt assembly surface connection unit, and the constant cross-section unit of the assembly bolt.

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