Tunnel starting tunneling construction method

Abstract

The invention relates to a tunnel starting tunneling construction method which comprises the steps that the posture of a sleeve device is adjusted to be aligned to a to-be-fixed position of a starting tunnel portal area, and posture adjustment comprises the height, the horizontal swing angle and the pitching angle of the center line of the sleeve device. The sleeve device is fixedly connected with a steel pipe piece of a starting tunnel portal; filling a first type of filling medium into the filler sealing space, and keeping the pressure in the filler sealing space at a first pressure value; a closed tunneling space is formed among the sleeve device, the starting tunnel portal area and the tunneling main machine. And the tunneling main machine is controlled to move along the tunneling space and conduct tunneling to break a tunnel portal area, and along with tunneling of the tunneling main machine, tunnel segments are assembled ring by ring and propelled. The posture of the sleeve device is adjusted at multiple angles, so that accurate adjustment of the sleeve device is achieved, and the assembly and adjustment modes of the sleeve device are flexible.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a tunnel initial excavation construction method. Background Art

[0002] The sleeve device is fixed in the starting tunnel area to cooperate with the main tunneling machine for tunneling construction. The joint surface between the sleeve device and the steel pipe segment in the starting tunnel area is sealed, and when the main tunneling machine breaks through the tunnel area, the soil pressure between the soil layer and the main tunneling machine is different, which can easily cause the main tunneling machine to deviate from the excavation direction and cause water and sand gushing.

[0003] During the process of connecting the sleeve device with the steel pipe segments around the starting tunnel area, due to the large size and weight of the sleeve device, it is difficult to adjust the surface fit between the end face of the sleeve device and the steel pipe segment, which can easily lead to technical problems such as excessive local gaps and affecting the sealing effect of the joints, and therefore needs to be improved. Summary of the invention

[0004] In order to overcome the problems existing in the related art, an embodiment of the present invention provides a tunnel initial excavation construction method to solve the technical problems of excavation direction deviation of the excavation main machine and difficulty in adjusting the sleeve device.

[0005] According to a first aspect of an embodiment of the present invention, there is provided a tunnel excavation construction method, comprising: Adjust the attitude of the sleeve device to align with the waiting fixed position in the starting tunnel area, and the attitude adjustment includes the height, horizontal swing angle and pitch angle of the center line of the sleeve device; The sleeve device is fixedly connected to the steel pipe segment of the starting tunnel; A type of filling medium is filled into the filling sealing space, and the pressure in the filling sealing space is maintained at a first pressure value; wherein the sleeve device is provided with at least two sealing components, the sealing components are elastically abutted against the outer peripheral wall of the excavation main machine, the filling sealing space is the space between two adjacent sealing components and the outer peripheral wall of the excavation main machine, and the type of filling medium is one of grease or liquid; A closed excavation space is formed between the sleeve device, the starting tunnel area and the excavation main machine; The excavation main machine is controlled to move along the excavation space and excavate to break the tunnel gate area. As the excavation main machine advances, the tunnel segments are assembled and advanced ring by ring.

[0006] In one embodiment, the closed excavation space formed by the sleeve device, the starting tunnel area and the excavation main machine further includes: The second type of filling medium is filled into the excavation space to obtain the soil bin pressure value. When the soil bin pressure value reaches the second pressure value, the injection of the second type of filling medium is stopped and the soil bin pressure value is detected in real time. Check the joint surface between the sleeve device and the starting tunnel area; Maintaining the pressure in the excavation space at a second pressure value for a preset period of time; When the pressure value change in the excavation space is within the allowable decay range, the excavation host allows the excavation operation to be performed.

[0007] In one embodiment, the sleeve device and the steel pipe segment of the launch portal are connected by a welding piece, and the welding piece is sealed around the area of ​​the sleeve device and the steel pipe segment.

[0008] In one embodiment, the second type of filling medium is one or more of bentonite, clay, bentonite, clay, slurry, and polymer materials.

[0009] In one embodiment, the adjustment sleeve device is aligned to the position to be fixed in the starting tunnel area, including: The starting trolley is moved along the track to the starting tunnel gate area, and the starting trolley is provided with a lifting assembly and an adjusting frame device; Controlling the lifting and lowering movement of the lifting assembly to move the starting trolley and the sleeve device as a whole, and the center line of the sleeve device is lifted to a preset center position of the starting tunnel gate area; The central axis of the sleeve device is adjusted to align with the preset central position of the starting tunnel door through the adjustment frame device.

[0010] In one embodiment, the adjustment frame device includes an adjustment platform, which is used to support the sleeve device. The adjustment frame device also includes at least one of a translation assembly, a rotation assembly and a side thrust assembly. The translation assembly is used to push the adjustment platform to move and / or swing along the axial direction of the sleeve device, the side thrust assembly is used to push the adjustment platform to move along the radial direction of the sleeve device, and the rotation assembly is used to drive the sleeve device to rotate relative to the adjustment platform to adjust the end face posture of the sleeve device.

[0011] In one embodiment, the step of filling a type of filling medium into the filler sealed space and maintaining the pressure in the filler sealed space at a first pressure value comprises: A type of filling medium is injected from the injection port at the lower side of the sleeve device, each of the injection ports is correspondingly connected to a filler sealing space, and a vent hole is provided at the top of each filler sealing space, wherein the type of filling medium is one of grease or liquid; When a type of filling medium overflows from the vent hole, the vent hole is controlled to be closed; Continue to fill the first type of filling medium until the pressure in the sealing space of the filling material reaches a first pressure value.

[0012] In one embodiment, the sealing assembly adopts a shield tail brush assembly, and a type of filling medium is pre-filled in each shield tail brush assembly; or, The sealing component adopts a sealing ring or a rubber piece.

[0013] In one embodiment, the sleeve assembly supports the main boring machine; wherein, A plurality of support mechanisms are fixed at intervals on the inner wall of the sleeve device, and at least part of the support mechanisms are distributed in the bottom area of ​​the filler sealing space; The excavation main machine is mounted on the support mechanism to adjust the center line of the excavation main machine and the center line of the sleeve device to coincide with each other.

[0014] In one embodiment, the support mechanism includes at least two sets of guide rails, and the guide surfaces at the top of the plurality of sets of guide rails gradually converge from the opening of the sleeve device toward the cave entrance area.

[0015] In one embodiment, as the tunneling machine advances, assembling tunnel segments ring by ring and advancing them includes: Controlling the excavation host to break open the tunnel gate area; After the excavation main machine excavates a ring of tunnel segments, the segments are assembled and connected to form a ring of tunnel segments; When the excavation depth of the excavation main machine exceeds that of the sealing component, the sealing component elastically abuts against the outer peripheral wall of the tunnel segment; A type of filling medium is continuously injected into the filler sealing space until a third pressure value is reached, and the third pressure value is greater than the soil pressure.

[0016] In one embodiment, as the tunneling machine advances, assembling tunnel segments ring by ring and advancing them includes: Controlling the excavation host to break open the tunnel gate area; After the main tunneling machine excavates one ring of depth each time, the pipe jacking machine equipment pushes a new ring of tunnel segments into the tunnel; When the excavation depth of the excavation main machine exceeds that of the sealing component, the sealing component elastically abuts against the outer peripheral wall of the tunnel segment; During the advancement of each ring of tunnel segments, a type of filling medium is always injected into the filler sealing space until a third pressure value is reached, and the third pressure value is greater than the soil pressure.

[0017] The technical solution provided by the embodiment of the present invention may include the following beneficial effects: the posture of the sleeve device can be adjusted at multiple angles, thereby achieving precise adjustment of the sleeve device, and the assembly and adjustment methods of the sleeve device are flexible. A type of filling medium cooperates with the sealing component between the sleeve device and the excavation host to form multiple seals, and provides pressure support for the sealing component so that the sealing component can seal the space and reduce the risk of leakage. The excavation space is a closed space, and the excavation host can reduce risks and improve construction safety during the excavation and breaking of the tunnel door.

[0018] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] Figure 1 It is a block diagram showing a tunnel excavation and construction method according to an embodiment.

[0021] Figure 2 The present invention is a flowchart showing a pressure maintaining process of a tunneling space according to an embodiment.

[0022] Figure 3 It is a schematic diagram showing the adjustment of the sleeve device installed on the starting trolley according to one embodiment.

[0023] Figure 4 The diagram is a schematic diagram showing a pressure-maintaining cross section of a sleeve device connected to a tunnel segment according to an embodiment.

[0024] In the figure, there are a starting trolley 10; a lifting assembly 11; an adjusting frame device 20; a translation assembly 21; a side thrust assembly 22; a rotating assembly 23; an adjustment platform 24; a sleeve device 30; a sealing assembly 31; a shield tail brush assembly 311; a type of filling medium 32; a filling sealing space 33; an excavation main machine 40; a starting tunnel portal area 50; and an excavation space 60. DETAILED DESCRIPTION

[0025] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside", etc. appear to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figures 1 to 4 As shown, the present invention provides a tunnel initial excavation construction method, and the tunnel initial excavation construction method comprises the following steps: S101, adjust the posture of the sleeve device 30 to align with the position to be fixed in the starting tunnel portal area 50. The posture adjustment includes the height of the center line of the sleeve device 30, the horizontal swing angle and the pitch angle. The sleeve device 30 is placed on the adjustment frame device 20, and moves along the tunnel guide rail to the starting tunnel portal area 50 with the starting trolley 10. By adjusting the starting trolley 10 and the adjustment frame device 20, the posture of the sleeve device 30 is adjusted to achieve precise adjustment of the connection position of the sleeve device 30. The posture adjustment of the sleeve device 30 is completed on the starting trolley 10, without the need to add other adjustment equipment, thereby improving construction efficiency and reducing operation difficulty.

[0029] S102, the sleeve device 30 is fixedly connected to the steel pipe segment of the starting tunnel 50. The sleeve device 30 is connected to the steel pipe segment, and the joint is sealed. In an optional embodiment, the sleeve device 30 is connected to the steel pipe segment by welding, and the weld is sealed to form a sealed connection. In another optional embodiment, the sleeve device 30 is mechanically connected to the steel pipe segment, and the sleeve device 30 and the steel pipe segment are locked and connected by fasteners to form a joint seal, which is convenient for disassembly and can be reused. In another optional embodiment, the sleeve device 30 and the steel pipe segment are abutted, and the abutment mechanism pushes the sleeve device 30 to fit the surface of the steel pipe segment. An elastic seal is set at the joint to achieve abutment sealing. Alternatively, the pull rod mechanism is fixed to the steel pipe segment, and the pull rod mechanism connects the sleeve device 30 and tightens the sleeve device 30 to abut against the steel pipe segment. The above-mentioned different embodiments can be used in combination or independently to adapt to different construction scenarios.

[0030] S103, fill a type of filling medium 32 into the filling sealing space 33, and keep the pressure in the filling sealing space 33 at a first pressure value. The sleeve device 30 is provided with at least two sealing components 31, and the sealing components 31 are elastically abutted against the outer peripheral wall of the excavation main machine 40, and the filling sealing space 33 is the space between two adjacent sealing components 31 and the outer peripheral wall of the excavation main machine 40. In this step, the sealing component 31 has a suitable elastic deformation effect to fit the outer peripheral wall of the excavation main machine 40. The type of filling medium 32 is filled between two adjacent sealing components 31, which can provide balanced support for the sealing component 31. Preferably, the type of filling medium 32 is configured as a fluid, such as grease, hydraulic oil, water, slurry, etc.

[0031] S104, a closed excavation space 60 is formed between the sleeve device 30, the starting tunnel portal area 50 and the excavation main machine 40. The excavation main machine 40 is installed on the sleeve device 30, and the sleeve device 30 and the excavation main machine 40 are sealed by the sealing assembly 31, and the joint surface between the sleeve assembly and the starting tunnel portal area 50 is sealed. The soil bin of the excavation main machine 40 is closed, so as to construct a closed excavation space 60 between the sleeve device 30, the starting tunnel portal area 50 and the excavation main machine 40.

[0032] S105, controlling the excavation main machine 40 to move along the excavation space 60 and excavate the tunnel portal area. As the excavation main machine 40 advances, the tunnel segments are assembled and advanced ring by ring.

[0033] Therefore, in this embodiment, the posture of the sleeve device 30 is adjusted at multiple angles, thereby achieving precise adjustment of the sleeve device 30, and the assembly and adjustment methods of the sleeve device 30 are flexible. A type of filling medium 32 is combined with the sealing component 31 between the sleeve device 30 and the excavation host 40 to form multiple seals. A type of filling medium 32 provides balanced pressure support for the sealing component 31 to improve the pressure resistance of the sealing component 31 from the excavation space 60 direction and reduce the risk of leakage. The excavation space 60 is a closed space, and the excavation host 40 can reduce risks and improve construction safety during the excavation and breaking of the tunnel door.

[0034] Furthermore, in step S104, a closed excavation space 60 is formed between the sleeve device 30, the starting tunnel area 50 and the excavation main machine 40, and the following steps are performed to further improve the construction safety of the excavation main machine 40 breaking the starting tunnel area 50. The steps include: S201, fill the second type of filling medium into the excavation space 60, and obtain the soil bin pressure value. When the soil bin pressure value reaches the second pressure value, stop injecting the second type of filling medium and then detect the soil bin pressure value in real time. The second type of filling medium fills the excavation space 60, thereby increasing the pressure in the stubborn space. Further preferably, the filling pressure of the second type of filling medium is substantially the same as the soil pressure behind the starting tunnel area 50, so that the excavation main body is always in the same pressure range during the excavation process, so that stable excavation can be maintained, and the excavation pressure changes little. Accordingly, the excavation construction accuracy of the excavation main machine 40 is high. Preferably, the second type of filling medium adopts a granular structure that expands when exposed to water, wherein water is added to the excavation space 60 after the granules are filled to form an expansion pressure. For example, the second type of filling medium can be set to one or more of bentonite, clay, bentonite, clay, slurry, and polymer materials.

[0035] S202, check the joint surface of the sleeve device 30 and the starting tunnel area 50. Perform a pressure holding test on the sleeve device 30, and observe the surrounding area of ​​the sleeve device 30 to determine whether there is penetration of the second type of filling medium or water in the surrounding area. Furthermore, in addition to checking the leakage around the sleeve device 30, it is also necessary to check the change in the second pressure value. If the pressure change is large, there may be a leakage point. For example, the preset time can be set to 5 minutes to 20 minutes. For example, according to the actual construction requirements, the preset time is set to 5 minutes, 10 minutes, 15 minutes, and 20 minutes.

[0036] S203, maintaining the pressure in the excavation space 60 at the second pressure value for a preset time. After the second type of filling medium completely fills the excavation space 60, continue to test the pressure in the excavation space 60. The second pressure value can be adjusted based on the soil pressure at the back of the initial tunnel portal area 50, so as to maintain the balance of the inner and outer sides of the initial tunnel portal area 50. For example, the second pressure value is set to 0.3Mpa-0.5Mpa.

[0037] S204, when the pressure value change in the excavation space 60 is within the allowable decay range, the excavation host 40 allows the excavation operation to be performed. After confirming that there is no leakage around the sleeve device 30, the pressure is maintained in place and the excavation operation can be performed. The allowable decay range is the reduction value of the pressure in the excavation space 60 during the pressure maintenance process, and the reduction value is adjusted according to the tunnel construction depth.

[0038] In one embodiment, the sleeve device 30 and the tunnel segment are connected by welding, the weld is an annular weld, and the welding area is sealed. In a preferred embodiment, the sleeve device 30 and the steel segment of the starting tunnel 50 are connected by a welding piece, and the welding piece is sealed around the area of ​​the sleeve device 30 and the steel segment. The welding piece is located at the intersection of the sleeve device 30 and the steel segment, thereby connecting the sleeve device 30 and the steel segment respectively. The welding piece can be configured as an arc-shaped piece to limit the corner of the closed sleeve device 30 and the steel segment, thereby achieving a sealing operation. In addition, the welding piece is cut to avoid damage to the sleeve device 30, and the sleeve device 30 can be reused.

[0039] Furthermore, the inner side of the sleeve device 30 is welded to the steel pipe segment by annular seam, thereby forming a sealing structure between the sleeve device 30 and the steel pipe segment. Accordingly, the weldment is connected to the outer side of the sleeve device 30, thereby forming a two-way sealing connection structure between the sleeve device 30 and the weldment, and the sealing effect is good.

[0040] In step S101, adjusting the sleeve device 30 to align with the position to be fixed in the starting tunnel area 50 includes the following steps: S301, move the starting trolley 10 along the track to the starting tunnel area 50. The starting trolley 10 is provided with a lifting assembly 11 and an adjustment frame device 20. The starting trolley 10 moves along the guide rail and has a large sliding range. The starting trolley 10 is modified, and a lifting assembly 11 is provided on the starting trolley 10. The lifting mechanism can control the overall lifting and lowering of the starting trolley 10, thereby adjusting the center line height of the sleeve device 30 on the starting trolley 10. The adjustment frame device 20 is installed on the starting trolley 10, and is used to perform secondary adjustments on the horizontal swing angle and pitch angle of the center line of the sleeve device 30.

[0041] S302 , controlling the lifting assembly 11 to move upward and downward so that the starting trolley 10 and the sleeve device 30 move as a whole, and the center line of the sleeve device 30 is lifted to a preset center position of the starting tunnel area 50 .

[0042] S303 , adjusting the central axis of the sleeve device 30 to align with the preset central position of the starting tunnel door 50 through the adjusting frame device 20 .

[0043] like Figures 1 to 4As shown, the lifting assembly 11 is located on opposite sides of the starting trolley 10. If the lifting assembly 11 on one side of the starting trolley 10 is raised and the lifting assembly 11 on the other side is stationary or lowered, the angle of the center line of the sleeve device 30 in the pitch direction can be adjusted, so that the center line of the sleeve device 30 and the preset center position of the starting portal area 50 are on the same horizontal plane.

[0044] Afterwards, the adjusting frame device 20 adjusts the angle of the center line of the sleeve device 30 along the horizontal plane direction to coincide with the preset center position of the starting tunnel area 50, which constitutes a refined position adjustment of the sleeve device 30. In addition, the adjusting frame device 20 is located on the starting trolley 10, making full use of existing equipment without adding additional equipment, thereby streamlining construction costs.

[0045] In one embodiment, the adjustment frame device 20 includes an adjustment platform 24, which is used to lift the sleeve device 30. The adjustment platform 24 is used to support and limit the position of the sleeve device 30 to form a preliminary positioning. Preferably, the adjustment platform 24 is provided with a recessed structure, which limits the outer peripheral wall of the sleeve device 30, thereby preventing the sleeve device 30 from rolling.

[0046] The adjustment frame device 20 adjusts the sleeve device 30 with the axial direction of the sleeve device 30 as the front-to-back direction and the axial direction perpendicular to the sleeve device 30 as the left-to-right direction.

[0047] The adjustment frame device 20 also includes at least one of a translation assembly 21, a rotation assembly 23 and a side push assembly 22. The translation assembly 21 is used to push the adjustment platform 24 to move and / or swing along the axial direction of the sleeve device 30. When the height of the starting trolley 10 is adjusted to coincide with the center line of the sleeve device 30 and the preset center position of the starting tunnel area 50, the translation assembly 21 can push the adjustment platform 24 to move in the front-back direction to push the sleeve device 30 to a position close to or in contact with the steel pipe segment.

[0048] Further, when the translation assembly 21 is set as a hydraulic cylinder mechanism, the whole horizontal push can be realized. When the translation assembly 21 is provided with two hydraulic cylinder mechanisms distributed at intervals, synchronous horizontal push can be realized. Alternatively, one hydraulic cylinder mechanism is extended and retracted, and the other hydraulic cylinder mechanism is stationary, so as to realize the plane swing. The extension and retraction amounts of the two hydraulic cylinder mechanisms are different, so as to realize the plane swing. Preferably, the hydraulic cylinder mechanism is hinged and rotated with the adjustment platform 24.

[0049] Further, the side thrust assembly 22 is used to push the adjustment platform 24 horizontally to move along the radial direction of the sleeve device 30. The side thrust assembly 22 can push the adjustment platform 24 to move in the left and right directions to push the sleeve device 30 to the preset center position aligned with the starting tunnel area 50. When the side thrust assembly 22 is set as a hydraulic mechanism, the adjustment platform 24 can be pushed horizontally to the left or right. When the side thrust assembly 22 includes two hydraulic mechanisms arranged relatively to each other, the two hydraulic mechanisms are distributed on both sides of the adjustment platform 24, and the adjustment platform 24 can be pushed horizontally to the left or right. Alternatively, when the side thrust assembly 22 includes four hydraulic mechanisms arranged relatively to each other, a group of two hydraulic mechanisms are distributed at intervals on one side of the adjustment platform 24, one of which is telescopically changed, and the other hydraulic mechanism is stationary to achieve plane swing. The telescopic amounts of the two hydraulic mechanisms are different, thereby achieving plane swing. Preferably, the hydraulic mechanism is hinged and rotated with the adjustment platform 24.

[0050] Further, the rotating assembly 23 is used to drive the sleeve device 30 to rotate relative to the adjustment platform 24 to adjust the end face posture of the sleeve device 30. The rotating assembly 23 drives the sleeve device 30 to rotate, thereby adjusting the curved surface of the end face of the sleeve device 30 to coincide with the curved surface of the steel pipe segment. Preferably, when the rotating assembly 23 is configured as a telescopic mechanism, the telescopic mechanism connects the adjustment platform 24 and the sleeve device 30 to achieve circumferential rotation of the sleeve device 30 to adjust the end face angle of the sleeve device 30. When the rotating assembly 23 is configured as two telescopic mechanisms, the two telescopic mechanisms are respectively connected to the two sides of the sleeve device 30 to achieve rotation of both sides.

[0051] In the above step S103, a type of filling medium 32 is filled into the filler sealed space 33, and the pressure in the filler sealed space 33 is maintained at a first pressure value, including the following steps: S401, a type of filling medium 32 is injected from the injection port on the lower side of the sleeve device 30, each injection port is connected to a filler sealed space 33, and an air outlet is provided at the top of each filler sealed space 33. The type of filling medium 32 is injected from the bottom area of ​​the sleeve device 30, so that the type of filling medium 32 can be gradually filled upward and the air can be discharged, which can not only achieve full filling of the type of filling medium 32, but also reduce the amount of bubbles.

[0052] S402, when the first type of filling medium 32 overflows from the vent hole, the vent hole is controlled to be closed. When the first type of filling medium 32 empties the air in the filling sealed space 33 and overflows from the top vent hole of the sleeve device 30, it indicates that the filling sealed space 33 is full. At this time, the pressure of the first type of filling medium 32 in the filling sealed space 33 is small, and is only the pressure generated by its own weight.

[0053] S403, continue to fill the first type of filling medium 32 until the pressure in the filler sealed space 33 reaches the first pressure value. The first type of filling medium 32 is continued to be filled into the filler sealed space 33 to apply pressure to the filler sealed space 33, thereby increasing the pressure value in the filler sealed space 33.

[0054] By adjusting the filling direction and filling sequence of a type of filling medium 32 , it is possible to achieve the effect of less residual gas in the filling sealing space 33 , balanced pressure in all directions, and providing effective balanced support for the sealing component 31 .

[0055] Preferably, the sealing assembly 31 adopts a shield tail brush assembly 311, and a type of filling medium 32 is pre-filled in each shield tail brush assembly 311. Three shield tail brush assemblies 311 are provided, and a type of filling medium 32 is pre-filled in each shield tail brush assembly 311, so that the shield tail brush assembly 311 can effectively prevent the type of filling medium 32 in the filler sealing space 33 from penetrating into the shield tail brush assembly 311, and can also avoid the generation of bubbles.

[0056] In another embodiment, the sealing component 31 is a sealing ring or a rubber member. The sealing ring or the rubber member is an annular structural member, and the sealing component 31 is elastic to the outer peripheral wall of the sleeve device 30, thereby forming an elastic sealing structure. Optionally, the sealing component 31 is a hollow sealing ring, and the sealing ring is filled with gas or liquid to achieve elastic compression of the sleeve device 30. Optionally, the sealing component 31 is a rubber member, which is inclined and the end of the rubber member elastically fits the outer peripheral wall of the sleeve device 30.

[0057] In one embodiment, the sleeve device 30 is assembled to support the excavation main machine 40, wherein a plurality of support mechanisms are fixed at intervals on the inner wall of the sleeve device 30, and at least part of the support mechanisms are distributed in the bottom area of ​​the filler sealing space 33. The excavation main machine 40 is mounted on the support mechanisms to adjust the center line of the excavation main machine 40 to coincide with the center line of the sleeve device 30.

[0058] The support mechanisms are distributed at intervals in the bottom area of ​​the filler sealing space 33 to support and lift the excavation host 40. The support mechanisms are distributed at intervals in the bottom of the sleeve device 30 to form multi-point support positioning.

[0059] Preferably, the support mechanism includes at least two sets of guide rails, and the guide surfaces at the top of the multiple sets of guide rails gradually converge from the opening of the sleeve device 30 to the direction of the tunnel portal area. The sealing assembly 31 is provided with three support mechanisms that are spaced apart to support the tunneling main machine 40 at multiple points to achieve automatic centering. The guide surfaces at the top of the multiple sets of guide rails gradually converge from the opening of the sleeve device 30 to the direction of the tunnel portal area to achieve the gradual alignment of the tunneling main machine 40 to the center of the tunnel portal area, and the alignment effect is good.

[0060] In one embodiment, the technical solution disclosed in the above embodiment is applied to shield construction, and the tunnel segments are assembled ring by ring as the tunneling main machine 40 advances, including the following steps: The tunneling main machine 40 is controlled to break the tunnel portal area. The tunneling main machine 40 runs and digs the segment structure of the tunnel portal area to slowly advance into the soil layer outside the tunnel segment.

[0061] After the main boring machine 40 excavates a ring of tunnel segments, it is assembled and connected to form a ring of tunnel segments. The main boring machine 40 is gradually advanced along the sleeve device 30. As the excavation depth of the main boring machine 40 is greater than or equal to the width of a ring of tunnel segments, a new ring of tunnel segments is assembled, and the tunnel segments are located behind the main boring machine 40.

[0062] When the excavation depth of the main excavation machine 40 exceeds the sealing assembly 31, the sealing assembly 31 elastically abuts against the outer peripheral wall of the tunnel segment. Part of the tunnel segment is located in the main tunnel, and this part of the tunnel segment constitutes a negative ring segment. Part of the tunnel segment goes deep into the soil layer from the portal area to form the tunnel segment structure.

[0063] like Figures 1 to 4 As shown, a type of filling medium 32 is continuously injected into the filling sealing space 33 until a third pressure value is reached, and the third pressure value is greater than the soil pressure. The sealing component 31 elastically abuts against the negative ring segment, thereby preventing the liquid in the excavated soil layer from entering the sleeve device 30. The filling sealing space 33 seals the gap between the sleeve device 30 and the negative ring segment under high pressure support, thereby providing a stable sealing effect. During the shield construction process, the injection of the type of filling medium 32 can be stopped after the pressure maintenance of the type of filling medium 32 is completed, and there is no need to continuously inject the type of filling medium 32.

[0064] In another embodiment, the technical solution disclosed in the above embodiment is applied to the construction of the pipe jacking method, and the tunnel segments are assembled ring by ring as the tunneling main machine 40 advances, including the following steps: The tunneling main machine 40 is controlled to break the tunnel portal area. The tunneling main machine 40 runs and digs the segment structure of the tunnel portal area to slowly advance into the soil layer outside the tunnel segment.

[0065] After each ring of tunneling depth of the main boring machine 40, the pipe jacking machine equipment pushes a new ring of tunnel segments into the tunnel. The main boring machine 40 gradually advances along the sleeve device 30. As the excavation depth of the main boring machine 40 is greater than or equal to the width of a ring of tunnel segments, the pipe jacking machine equipment retreats and assembles a new ring of tunnel segments in front of the pipe jacking machine equipment. The pipe jacking machine equipment pushes the tunnel segments into the tunnel excavated by the main boring machine 40 to achieve segment construction.

[0066] When the excavation depth of the main excavation machine 40 exceeds the sealing assembly 31, the sealing assembly 31 elastically contacts the outer peripheral wall of the tunnel segment. The jacking machine equipment pushes the newly added tunnel segment into the tunnel, thereby realizing the tunnel construction. The tunnel segment pushed by the sealing assembly 31 is moving and changing. Every time the jacking machine equipment pushes the newly added tunnel segment to move, the injection mechanism always keeps injecting a type of filling medium 32 into the filling sealing space 33.

[0067] During the advancement of each ring of tunnel segments, the first type of filling medium 32 is always injected into the filling sealing space 33 until a third pressure value is reached, and the third pressure value is greater than the soil pressure. During the jacking construction process, as the tunnel segments are pushed and moved, the first type of filling medium 32 needs to be continuously injected to supplement the first type of filling medium 32 brought out by the movement of the tunnel segments.

[0068] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0069] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A tunnel initial excavation construction method, characterized in that: include: Adjust the attitude of the sleeve device to align with the waiting fixed position in the starting tunnel area, and the attitude adjustment includes the height, horizontal swing angle and pitch angle of the center line of the sleeve device; The sleeve device is fixedly connected to the steel pipe segment of the starting tunnel; A type of filling medium is filled into the filling sealing space, and the pressure in the filling sealing space is maintained at a first pressure value; wherein the sleeve device is provided with at least two sealing components, the sealing components are elastically abutted against the outer peripheral wall of the excavation main machine, and the filling sealing space is the space between two adjacent sealing components and the outer peripheral wall of the excavation main machine; A closed excavation space is formed between the sleeve device, the starting tunnel area and the excavation main machine; The excavation main machine is controlled to move along the excavation space and excavate to break the tunnel gate area. As the excavation main machine advances, the tunnel segments are assembled and advanced ring by ring.

2. The tunnel excavation construction method according to claim 1, characterized in that: The closed excavation space formed by the sleeve device, the starting tunnel area and the excavation main machine also includes: The second type of filling medium is filled into the excavation space to obtain the soil bin pressure value. When the soil bin pressure value reaches the second pressure value, the injection of the second type of filling medium is stopped and the soil bin pressure value is detected in real time. Check the joint surface between the sleeve device and the starting tunnel area; Maintaining the pressure in the excavation space at a second pressure value for a preset period of time; When the pressure value change in the excavation space is within the allowable decay range, the excavation host allows the excavation operation to be performed.

3. The tunnel excavation construction method according to claim 2, characterized in that: The sleeve device and the steel pipe segment of the starting tunnel are connected by a welding piece, and the welding piece is arranged to seal the area surrounding the sleeve device and the steel pipe segment.

4. The tunnel excavation construction method according to claim 2, characterized in that: The second type of filling medium is one or more of bentonite, clay, bentonite, clay, slurry and polymer materials.

5. The tunnel excavation construction method according to claim 1, characterized in that: The adjustment sleeve device is aligned to the position to be fixed in the starting tunnel area, including: The starting trolley is moved along the track to the starting tunnel gate area, and the starting trolley is provided with a lifting assembly and an adjusting frame device; Controlling the lifting and lowering movement of the lifting assembly to move the starting trolley and the sleeve device as a whole, and the center line of the sleeve device is lifted to a preset center position of the starting tunnel gate area; The central axis of the sleeve device is adjusted to align with the preset central position of the starting tunnel door through the adjustment frame device.

6. The tunnel excavation construction method according to claim 5, characterized in that: The adjustment frame device includes an adjustment platform, and the adjustment platform is used to lift the sleeve device. The adjustment frame device also includes at least one of a translation component, a rotation component and a side thrust component. The translation component is used to push the adjustment platform to move and / or swing along the axial direction of the sleeve device, the side thrust component is used to push the adjustment platform to move along the radial direction of the sleeve device, and the rotation component is used to drive the sleeve device to rotate relative to the adjustment platform to adjust the end face posture of the sleeve device.

7. The tunnel excavation construction method according to claim 1, characterized in that: The step of filling a type of filling medium into the filler sealed space and maintaining the pressure in the filler sealed space at a first pressure value comprises: A type of filling medium is injected from the injection port at the lower side of the sleeve device, each of the injection ports is correspondingly connected to a filler sealing space, and a vent hole is provided at the top of each filler sealing space, wherein the type of filling medium is one of grease or liquid; When a type of filling medium overflows from the vent hole, the vent hole is controlled to be closed; Continue to fill the first type of filling medium until the pressure in the sealing space of the filling material reaches a first pressure value.

8. The tunnel excavation construction method according to claim 7, characterized in that: The sealing assembly adopts a shield tail brush assembly, and a type of filling medium is pre-filled in each shield tail brush assembly; or, The sealing component adopts a sealing ring or a rubber piece.

9. The tunnel excavation construction method according to claim 1, characterized in that: The sleeve device assembly supports the excavation host; wherein, A plurality of support mechanisms are fixed at intervals on the inner wall of the sleeve device, and at least part of the support mechanisms are distributed in the bottom area of ​​the filler sealing space; The excavation main machine is mounted on the support mechanism to adjust the center line of the excavation main machine and the center line of the sleeve device to coincide with each other.

10. The tunnel excavation construction method according to claim 9, characterized in that: The support mechanism comprises at least two groups of guide rails, and the guide surfaces at the tops of the multiple groups of guide rails gradually converge from the opening of the sleeve device toward the cave entrance area.

11. The tunnel excavation construction method according to any one of claims 1 to 10, characterized in that: As the tunneling machine advances, the tunnel segments are assembled and advanced one by one, including: Controlling the excavation host to break open the tunnel gate area; After the excavation main machine excavates a ring of tunnel segments, the segments are assembled and connected to form a ring of tunnel segments; When the excavation depth of the excavation main machine exceeds that of the sealing component, the sealing component elastically abuts against the outer peripheral wall of the tunnel segment; A type of filling medium is continuously injected into the filler sealing space until a third pressure value is reached, and the third pressure value is greater than the soil pressure.

12. The tunnel excavation construction method according to any one of claims 1 to 10, characterized in that: As the tunneling machine advances, the tunnel segments are assembled and advanced one by one, including: Controlling the excavation host to break open the tunnel gate area; After the main tunneling machine excavates one ring of depth each time, the pipe jacking machine equipment pushes a new ring of tunnel segments into the tunnel; When the excavation depth of the excavation main machine exceeds that of the sealing component, the sealing component elastically abuts against the outer peripheral wall of the tunnel segment; During the advancement of each ring of tunnel segments, a type of filling medium is always injected into the filler sealing space until a third pressure value is reached, and the third pressure value is greater than the soil pressure.

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