Temporary tunnel supporting device and method

Abstract

The invention discloses a tunnel temporary supporting device and method, and relates to the technical field of tunnel engineering.The tunnel temporary supporting device comprises a supporting arch part movably installed in a constructed tunnel in the direction of the constructed tunnel, and the supporting arch part is used for supporting and isolating exposed surrounding rock; the support arch part comprises an isolation arch and a support truss; the whole isolation arch is of an arc-shaped arch crown structure, the structural size of the isolation arch is matched with the outline of a constructed tunnel, and the isolation arch is supported at the bottom of exposed surrounding rock. The two ends of the isolation arch are supported on the ground of the constructed tunnel; the supporting truss is of an arc-shaped truss structure, the structural size of the supporting truss is matched with the outline of the inner circumferential side of the isolation arch, and the supporting truss is supported below the isolation arch and fixedly connected with the isolation arch. The two ends of the supporting truss are supported on the ground of a constructed tunnel. The whole tunnel temporary supporting device and method can prevent exposed surrounding rock deformation and exposed surrounding rock chipping, a safe operation area is provided, and construction safety and construction efficiency are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering, and in particular to a temporary tunnel supporting device and a supporting method. Background Art

[0002] With the long-term use of tunnels after construction, tunnel supports may develop damage defects due to surrounding rock stress, groundwater erosion, weathering, etc., which may reduce the mechanical properties of the tunnel support and even cause support failure and collapse, resulting in personal injury and property loss. To ensure the long-term and stable operation of existing tunnels, tunnel supports need to be frequently inspected. When potential risks are found in tunnel supports, they need to be repaired or replaced in a timely manner. The existing primary support removal and replacement process is as follows: 1. Remove the original primary support; 2. Transport the waste slag; 3. Initial spraying of concrete on the surrounding rock; 4. Laying of steel mesh; 5. Installation of steel arch frames; 6. Re-spraying of concrete. After removing the original primary support, to ensure construction safety, the next section of the old primary support must be removed only after the new primary support is formed, which takes a long time to construct. If the removal of old primary supports and the pouring of new ones are carried out simultaneously, the surrounding rock will be exposed for a long period of time. During this period, construction workers and equipment may be exposed to the unsupported surrounding rock. To ensure the safety of personnel and equipment and the normal operation of the construction, the exposed surrounding rock must be quickly and effectively supported and isolated. However, there is currently a lack of such temporary support and protection devices after the removal of tunnel primary supports. Summary of the Invention

[0003] The purpose of the present invention is to provide a temporary tunnel support device and support method to solve the problems existing in the prior art, to prevent deformation and falling of exposed surrounding rock, to provide a safe working area, and to ensure construction safety and efficiency.

[0004] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides a temporary tunnel support device, comprising a support arch portion movably installed in the tunnel being constructed along the direction of the tunnel being constructed, the support arch portion being used to support and isolate exposed surrounding rock;

[0005] The supporting arch portion includes an isolation arch and a supporting truss;

[0006] The isolation arch is an overall arc-shaped arch structure, the structural dimensions of which match the outline of the tunnel being constructed and are supported on the bottom of the exposed surrounding rock; both ends of the isolation arch are supported on the ground of the tunnel being constructed;

[0007] The supporting truss is an arc-shaped truss structure, the structural dimensions of which match the contour of the inner circumference of the isolation arch, and is supported below the isolation arch and fixedly connected to the isolation arch; both ends of the supporting truss are supported on the ground of the tunnel being constructed.

[0008] Optionally, the isolation arch includes a plurality of arc-shaped steel plates, each of the arc-shaped steel plates is spliced ​​in sequence along the circumference of the isolation arch, and each of the arc-shaped steel plates is fixedly connected to the supporting truss.

[0009] Optionally, the support truss includes a plurality of truss units, and the truss units are sequentially connected along the circumference of the support truss;

[0010] The truss unit includes a first support frame, a second support frame and a plurality of connecting rods. The structure of the first support frame is larger than that of the second support frame and is connected to the inner peripheral wall of the isolation arch. The second support frame is spaced apart on the side of the first support frame away from the isolation arch. The connecting rods are evenly distributed between the first support frame and the second support frame, and the two ends of the connecting rods are respectively connected to the first support frame and the second support frame.

[0011] Optionally, each of the connecting rods is divided into a support rod and a reinforcement rod;

[0012] The first support frame and the second support frame are both rectangular frame structures, and the support rods are connected between two opposite vertices of the first support frame and the second support frame;

[0013] The reinforcing rod is connected between two adjacent support rods, one end of the reinforcing rod is connected to the position where one support rod is connected to the first support frame, and the other end of the reinforcing rod is connected to the position where the other support rod is connected to the second support frame.

[0014] Optionally, the first support frame, the second support frame, the support rod and the reinforcing rod are all made of rectangular tubes.

[0015] Optionally, the supporting arch portion further includes two supporting bases; the two supporting bases are spaced apart along the width direction of the constructed tunnel and are both supported on the ground of the constructed tunnel;

[0016] One end of the isolation arch and one end of the support truss are both fixed at the top position of one support base; the other end of the isolation arch and the other end of the support truss are both fixed at the top position of another support base.

[0017] Optionally, it further comprises two telescopic support parts both of which can be telescopically extended in the vertical direction; the two telescopic support parts are respectively arranged between the two ends of the isolation arch and the support truss and the ground.

[0018] Optionally, the telescopic support portion includes a hydraulic base, a hydraulic support top and a hydraulic cylinder;

[0019] The hydraulic base is supported on the ground of the tunnel being constructed, the hydraulic support top is spaced apart above the hydraulic base, the hydraulic cylinder is arranged between the hydraulic base and the hydraulic support top, and the piston rod of the hydraulic cylinder extends in the vertical direction; the hydraulic base is provided with an oil pump for transporting the hydraulic oil in the hydraulic cylinder.

[0020] Optionally, it further comprises two movable platform parts; the two movable platform parts are respectively arranged between the two ends of the isolation arch and the support truss and the ground;

[0021] The mobile platform part includes an adjustment platform, a sliding sleeve and a sliding rail; the adjustment platform is used to support the bottom of the isolation arch and the end of the support truss, the sliding rail extends along the direction of the constructed tunnel, and the sliding sleeve is installed on the adjustment platform and slidably set on the sliding rail.

[0022] A support method is also provided, comprising the following steps:

[0023] S1. Design Dimensions: Through investigation and testing, the specifications, surrounding rock stress and grade of the tunnel to be constructed are obtained, and the specifications and dimensions of the supporting arch, adjustment platform and slide rails of the temporary tunnel support device are designed;

[0024] S2. Prefabricate the temporary tunnel support device: Lay slide rails according to the direction of the tunnel to be constructed, assemble the slide sleeves on the slide rails; cast the adjustment platform of corresponding height on the slide sleeve according to pre-designed dimensions; after the adjustment platform solidifies, install the telescopic support portion on the adjustment platform; install a support base above the telescopic support portion, and assemble the support truss and isolation arch on the support base; prefabricate a corresponding number of temporary tunnel support devices according to the required construction plan;

[0025] S3. Remove the required distance of the tunnel primary support according to the required construction plan;

[0026] S4, moving the temporary tunnel support device to below the exposed surrounding rock; adjusting the telescopic support portion, and lifting the temporary tunnel support device until the isolation arch contacts and supports the exposed surrounding rock;

[0027] S5. Construction personnel and construction equipment are located under the temporary tunnel support device and remove the primary tunnel support of the next area according to the required construction plan;

[0028] S6. Adjust the telescopic support portion, lower the temporary tunnel support device, and move the temporary tunnel support device to the next exposed surrounding rock;

[0029] S7. Support the exposed surrounding rock after the temporary tunnel support device is removed.

[0030] Compared with the prior art, the present invention has achieved the following technical effects:

[0031] The temporary tunnel support device disclosed in the present invention can be pre-assembled before the primary support of the tunnel is removed. After the primary support of the tunnel is removed, it can be moved to the exposed surrounding rock in a timely and rapid manner to support the exposed surrounding rock, reduce deformation of the exposed surrounding rock, and avoid damage to construction personnel and construction equipment after the exposed surrounding rock collapses and blocks fall. After the primary support of the tunnel is removed, the exposed surrounding rock can be quickly and effectively supported, ensuring construction safety and smooth construction. At the same time, a safe working area is provided for further removal of the primary support of the tunnel, so that the removal of the primary support of the old tunnel and the construction of the primary support of the new tunnel can be carried out simultaneously, ensuring the construction progress. The entire device not only fills the gap in the existing technology, but also provides strong technical support for tunnel construction and tunnel support replacement. In addition, compared with the existing tunnel support device, the present invention can be reused multiple times in the same tunnel, saving construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 It is a schematic diagram of the overall structure of the temporary tunnel support device disclosed in the present invention;

[0034] Figure 2 It is a structural schematic diagram of the supporting arch part disclosed in the present invention;

[0035] Figure 3 is a structural diagram of the support truss disclosed in the present invention; wherein Figure 3 (a) is a schematic diagram of the truss unit structure disclosed in the present invention; Figure 3 (b) is a schematic structural diagram of two truss units spliced ​​together according to the present invention; Figure 3 (c) is a schematic diagram of the overall structure of the support truss disclosed in the present invention;

[0036] Figure 4 It is a structural schematic diagram of the telescopic support portion of the present invention;

[0037] Figure 5 It is a structural schematic diagram of the mobile platform portion of the present invention;

[0038] Figure 6 It is a schematic diagram of the arrangement of the temporary tunnel support device of the present invention;

[0039] Among them: 1. Isolation arch; 2. Support truss; 3. Support base; 4. Hydraulic support top; 5. Piston rod; 6. Hydraulic cylinder; 7. Oil pipe; 8. Telescopic support part; 9. Oil pump; 10. Hydraulic base; 11. Adjustment table; 12. Slide sleeve; 13. Slide rail; 14. First support frame; 15. Second support frame; 16. Support rod; 17. Reinforcement rod. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0041] The purpose of the present invention is to provide a temporary tunnel support device and support method to solve the problems existing in the prior art, to prevent deformation and falling of exposed surrounding rock, to provide a safe working area, and to ensure construction safety and efficiency.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] like Figures 1 to 6 As shown, the present invention provides a temporary tunnel support device, including a supporting arch part that can be movably installed in the tunnel to be constructed along the direction of the tunnel to be constructed, the supporting arch part is used to support and isolate the exposed surrounding rock, prevent the exposed surrounding rock from deformation and collapse and fall, and provide a safe working space for the construction equipment and construction personnel below it; the supporting arch part includes an isolation arch 1 and a supporting truss 2; the isolation arch 1 is an overall arc-shaped arch structure, and its structural dimensions match the contour of the tunnel to be constructed, and is supported on the bottom of the exposed surrounding rock; both ends of the isolation arch 1 are supported on the ground of the tunnel to be constructed; the isolation arch 1 is used to contact and isolate the exposed surrounding rock, and can isolate the debris collapsed by the exposed surrounding rock; the supporting truss 2 is an arc-shaped truss structure, and its structural dimensions match the contour of the inner circumference of the isolation arch 1, and is supported below the isolation arch 1 and fixedly connected to the isolation arch 1; both ends of the supporting truss 2 are supported on the ground of the tunnel to be constructed; the supporting truss 2 is used to support the isolation arch 1 and the exposed surrounding rock, and is the main force-bearing structure in the entire supporting arch part. In this embodiment, the isolation arch 1 and the supporting truss 2 are preferably connected by welding to ensure the strength of the connection between the two.

[0044] The temporary tunnel support device disclosed in the present invention can be pre-assembled before the primary support of the tunnel is removed. After the primary support of the tunnel is removed, it can be moved to the exposed surrounding rock in a timely and rapid manner to support the exposed surrounding rock, reduce deformation of the exposed surrounding rock, and avoid damage to construction personnel and construction equipment after the exposed surrounding rock collapses and blocks fall. After the primary support of the tunnel is removed, the exposed surrounding rock can be quickly and effectively supported, ensuring construction safety and smooth construction. At the same time, a safe working area is provided for further removal of the primary support of the tunnel, so that the removal of the primary support of the old tunnel and the construction of the primary support of the new tunnel can be carried out simultaneously, ensuring the construction progress. The entire device not only fills the gap in the existing technology, but also provides strong technical support for tunnel construction and tunnel support replacement. In addition, compared with the existing tunnel support device, the present invention can be reused multiple times in the same tunnel, saving construction costs.

[0045] In a specific embodiment, the isolation arch 1 is made of steel plates to ensure the effectiveness of supporting the exposed surrounding rock; preferably, the isolation arch 1 includes a plurality of arc-shaped steel plates, each of which is spliced ​​in sequence along the circumference of the isolation arch 1, and each of the arc-shaped steel plates is fixedly connected to the support truss 2.

[0046] In a specific embodiment, the support truss 2 includes a plurality of truss units, each truss unit is connected in sequence along the circumference of the support truss 2, and preferably two adjacent truss units are welded together; the truss unit includes a first support frame 14, a second support frame 15 and a plurality of connecting rods, the structure of the first support frame 14 is larger than that of the second support frame 15, and is connected to the inner circumferential wall of the isolation arch 1, and the second support frame 15 is arranged at intervals on the side of the first support frame 14 away from the isolation arch 1; each connecting rod is evenly distributed between the first support frame 14 and the second support frame 15, and the two ends of the connecting rod are respectively connected to the first support frame 14 and the second support frame 15, the connecting rod is used to conduct stress, and preferably welding is used to complete the connection between the connecting rod and the first support frame 14 and the second support frame 15.

[0047] In this embodiment, the isolation arch 1 has a semicircular dome structure, the size of its semicircle determined by the outline of the tunnel being constructed. In the case where the isolation arch 1 comprises multiple curved steel plates, each of the curved steel plates forming the isolation arch 1 is an arc-shaped structure. After splicing, the entire isolation arch 1 forms a semicircular dome structure. The supporting truss 2 has a semicircular truss structure, the size of its semicircle determined by the outline of the isolation arch 1. Because the first support frame 14 is larger than the second support frame 15, the truss unit ends closer to the isolation arch 1 are larger, while those facing away from the isolation arch 1 are smaller. When the truss units are connected around a common center, a semicircular arch structure is formed.

[0048] In this embodiment, the radius of the isolation arch 1 and the radius of the support truss 2 are proportional to the radius of the tunnel vault being constructed. Due to thickness considerations, the outer radius of the isolation arch 1 coincides with the cross-sectional radius of the tunnel surrounding rock. The inner radius of the isolation arch 1 is equal to the cross-sectional radius of the tunnel surrounding rock minus the thickness of the isolation arch 1. The outer radius of the support truss 2 is equal to the inner radius of the isolation arch 1. The inner radius of the support truss 2 is calculated based on the required support force through structural mechanics.

[0049] In a specific embodiment, each connecting rod is divided into a support rod 16 and a reinforcement rod 17; the first support frame 14 and the second support frame 15 are both rectangular frame structures, and a support rod 16 is connected between the two opposite vertices of the first support frame 14 and the second support frame 15; a reinforcement rod 17 is connected between two adjacent support rods 16, one end of the reinforcement rod 17 is connected to the position where one support rod 16 is connected to the first support frame 14, and the other end of the reinforcement rod 17 is connected to the position where the other support rod 16 is connected to the second support frame 15.

[0050] In this embodiment, the first support frame 14, the second support frame 15, the support rod 16 and the reinforcement rod 17 are all made of rectangular tubes. Among them, since the first support frame 14 and the second support frame 15 are both rectangular frame structures, four rectangular tubes are welded in sequence respectively, and the support rod 16 and the reinforcement rod 17 are both made of a whole rectangular tube.

[0051] In one specific embodiment, the support arch portion further includes two support bases 3 , spaced apart along the width of the tunnel being constructed and supported on the tunnel floor. One end of the isolation arch 1 and one end of the support truss 2 are secured to the top of one support base 3 ; the other end of the isolation arch 1 and the other end of the support truss 2 are secured to the top of the other support base 3 . The support bases 3 support the isolation arch 1 and the support truss 2 and transmit internal stress throughout the entire device. The two ends of the isolation arch 1 and the two ends of the support truss 2 are welded to the tops of their respective support bases.

[0052] In a specific embodiment, it also includes two telescopic support parts 8 that can be telescopically extended in the vertical direction; the two telescopic support parts 8 are respectively arranged between the two ends of the isolation arch 1 and the support truss 2 and the ground. The telescopic support part 8 is used to lift the supporting arch part so that the supporting arch part is in close contact with the exposed surrounding rock, ensuring that the supporting arch part can effectively support the exposed surrounding rock. Alternatively, the telescopic support part 8 is used to lower the supporting arch part so that it is separated from the exposed surrounding rock and is convenient for moving to the next area to be supported. In other words, the purpose of the entire telescopic support part 8 is to lift and lower the supporting arch part, provide support for the exposed surrounding rock after lifting, and release the surrounding rock after lowering to facilitate movement.

[0053] The two telescopic support portions 8 are respectively supported at the bottom ends of the isolation arch 1 and the support truss 2 to support the isolation arch 1 and the support truss 2 as a whole, thereby supporting the entire support arch portion. In the embodiment in which the support arch portion also includes two support bases 3, the telescopic support portions 8 are correspondingly supported below the support bases.

[0054] In one specific embodiment, the telescopic support portion 8 comprises a hydraulic base, a hydraulic support top 4, and a hydraulic cylinder 6. The hydraulic base is supported on the ground of the tunnel being constructed, with the hydraulic support top 4 spaced above the hydraulic base. The hydraulic cylinder 6 is positioned between the hydraulic base and the hydraulic support top 4, with the piston rod 5 of the hydraulic cylinder 6 extending vertically. An oil pump 9 is provided on the hydraulic base for delivering hydraulic oil from the hydraulic cylinder 6. When the oil pump 9 delivers or extracts hydraulic oil from the hydraulic cylinder 6, the piston rod 5, under the pressure of the hydraulic oil, rises upward, causing the hydraulic support top 4 and its supporting arch to lift upward and support the surrounding rock, or lowers downward, causing the hydraulic support top 4 and its supporting arch to drop away from the exposed surrounding rock, facilitating the movement of the entire device to the next supported area. The hydraulic support top 4 supports the bottom ends of the isolation arch 1 and the support truss 2, and transmits the internal stress of the entire device to the hydraulic cylinder 6 and the hydraulic base. Specifically, the arch feet of the isolation arch 1 and the support truss 2 are welded to the support base 3. In the embodiment in which the supporting arch part further comprises two supporting bases 3, the hydraulic supporting top 4 of the telescopic supporting part 8 is correspondingly supported below the supporting base.

[0055] In this embodiment, the piston rod 5 can extend upward to the top end position of the hydraulic cylinder 6, then the end of the hydraulic cylinder 6 extending away from the piston rod 5 abuts on the hydraulic base, and the end of the piston rod 5 extending from the hydraulic cylinder 6 abuts on the hydraulic support top 4; the piston rod 5 can also extend downward to the bottom end position of the hydraulic cylinder 6, then the end of the hydraulic cylinder 6 extending away from the piston rod 5 abuts on the hydraulic support top 4, and the end of the piston rod 5 extending from the hydraulic cylinder 6 abuts on the hydraulic base.

[0056] In this embodiment, the oil inlet and outlet of the oil pump 9 are each connected to an oil pipe 7. These two oil pipes 7 are connected to the rod chamber and rodless chamber of the hydraulic cylinder 6 via a reversing valve. Switching of the reversing valve enables reciprocating movement of the piston rod 5. Preferably, the oil pump 9 is mounted on a hydraulic base, and a portion of the oil pipe 7 is embedded within a hydraulic base 10 to protect it.

[0057] In this embodiment, at least two hydraulic cylinders 6 are provided between the hydraulic base and the hydraulic support top 4 , and the hydraulic cylinders 6 are evenly distributed to ensure the effectiveness of the support for the hydraulic support top 4 and the supporting arch part, and to ensure the stability of the support.

[0058] In a specific embodiment, it also includes two mobile platform portions; the two mobile platform portions are respectively arranged between the ends of the isolation arch 1 and the support truss 2 and the ground; the mobile platform portion includes an adjustment platform 11, a sliding sleeve 12, and a sliding rail 13; the adjustment platform 11 is used to support the bottom of the ends of the isolation arch 1 and the support truss 2, and the sliding rail 13 extends along the direction of the tunnel being constructed. The sliding sleeve 12 is installed on the adjustment platform 11 and is slidably arranged on the sliding rail 13 to achieve the movement of the entire tunnel temporary support device. In summary, the mobile platform portion is used to support the entire support arch portion and enable the support arch portion to move in the direction of the sliding rail 13, that is, to move along the direction of the tunnel being constructed.

[0059] The adjustment platform 11 can be made of cast concrete, and its specific height can be determined according to the height of the tunnel side wall to be constructed. It is used to support the isolation arch 1 and the support truss 2 and lift them to corresponding heights.

[0060] In combination with the manner in which the entire device includes the telescopic support portion 8, the adjustment platform 11 is used to be supported on the bottom end of the telescopic support portion 8 and to supplement in advance the height that the telescopic support portion 8 is insufficient to be raised to, that is, when the telescopic support portion 8 is raised to the upper limit, the supporting arch portion still does not contact and support the exposed surrounding rock, and an adjustment platform of a certain height can be prefabricated to supplement the height.

[0061] When the telescopic support part 8 includes a hydraulic base, a hydraulic support top 4 and a hydraulic cylinder 6, the adjustment platform 11 is supported on the bottom end of the hydraulic base.

[0062] In one specific embodiment, the temporary tunnel support device includes a support arch portion, two telescopic support portions 8, and two mobile platform portions. The support arch portion is provided with an isolation arch 1 and a support truss 2, each supported by a support base 3 at both ends. The telescopic support portion 8 includes a hydraulic base, a hydraulic support top 4, and a hydraulic cylinder 6, with the hydraulic support top 4 supported below the support base 3. The mobile platform portion includes an adjustment platform 11, a sliding sleeve 12, and a slide rail 13, with the adjustment platform 11 supported below the hydraulic base. The support base 3 supports the isolation arch 1 and support truss 2, connects the support arch portion with the telescopic support portion 8, and transfers stress transmitted from the isolation arch 1 and support truss 2 to the telescopic support portion 8 and the mobile platform portion, ultimately transmitting it to the ground.

[0063] In a specific implementation, a number of temporary tunnel support devices can be prefabricated according to the specific plan of the tunnel primary support replacement construction, and arranged in sequence according to the direction of the tunnel being constructed, thereby providing sufficient safe working space for construction.

[0064] Furthermore, a support method is provided, comprising the following steps:

[0065] S1. Design dimensions: Through investigation and testing, the specifications, surrounding rock stress and surrounding rock grade of the tunnel to be constructed are obtained, and the specifications and dimensions of the supporting arch part, the adjustment platform 11 and the slide rail 13 of the temporary tunnel support device are designed;

[0066] S2. Prefabricate temporary tunnel support devices: Lay slide rails 13 along the route of the tunnel being constructed, and assemble the slide sleeves 12 onto the slide rails 13. Cast an adjustment platform 11 of a corresponding height on the slide sleeves 12 according to pre-designed dimensions. After the adjustment platform 11 solidifies, install the telescopic support portion 8 on the adjustment platform 11. Install the support base 3 above the telescopic support portion 8, and assemble the support truss 2 and isolation arch 1 above the support base 3. Prefabricate the corresponding number of temporary tunnel support devices according to the required construction plan.

[0067] S3. Remove the required distance of the tunnel primary support according to the required construction plan;

[0068] S4. Move the temporary tunnel support device to below the exposed surrounding rock; adjust the telescopic support portion 8 and raise the temporary tunnel support device until the isolation arch 1 contacts and supports the exposed surrounding rock; preferably, the telescopic support portion 8 includes a hydraulic base, a hydraulic support top 4, and a hydraulic oil cylinder 6. When it is necessary to raise the temporary tunnel support device, turn on the oil pump 9 to raise and lower the temporary tunnel support device so that it is supported on the exposed surrounding rock;

[0069] S5. Construction personnel and construction equipment are located under the temporary tunnel support device and dismantle the primary tunnel support of the next area according to the required construction plan;

[0070] S6. Adjust the telescopic support portion 8 to lower the temporary tunnel support device and move it to the next exposed surrounding rock. Preferably, the telescopic support portion 8 includes a hydraulic base, a hydraulic support top 4, and a hydraulic oil cylinder 6. When the temporary tunnel support device needs to be lowered, the oil pump 9 is turned on to lower the temporary tunnel support device and then move it to the next exposed surrounding rock.

[0071] S7. Support the exposed surrounding rock after the temporary tunnel support device is removed.

[0072] Adaptive changes based on actual needs are all within the scope of protection of the present invention.

[0073] It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0074] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A temporary tunnel support device, characterized in that: It includes a support arch portion that can be movably installed in the tunnel being constructed along the direction of the tunnel being constructed, and the support arch portion is used to support and isolate the exposed surrounding rock; The supporting arch portion includes an isolation arch and a supporting truss; The isolation arch is an overall arc-shaped arch structure, the structural dimensions of which match the outline of the tunnel being constructed and are supported on the bottom of the exposed surrounding rock; both ends of the isolation arch are supported on the ground of the tunnel being constructed; The supporting truss is an arc-shaped truss structure, the structural dimensions of which match the contour of the inner circumference of the isolation arch, and is supported below the isolation arch and fixedly connected to the isolation arch; both ends of the supporting truss are supported on the ground of the tunnel being constructed.

2. The temporary tunnel support device according to claim 1, characterized in that: The isolation arch includes a plurality of arc-shaped steel plates, each of which is spliced ​​in sequence along the circumference of the isolation arch, and each of the arc-shaped steel plates is fixedly connected to the supporting truss.

3. The temporary tunnel support device according to claim 1, characterized in that: The supporting truss comprises a plurality of truss units, and the truss units are sequentially connected along the circumference of the supporting truss; The truss unit includes a first support frame, a second support frame and a plurality of connecting rods. The structure of the first support frame is larger than that of the second support frame and is connected to the inner peripheral wall of the isolation arch. The second support frame is spaced apart on the side of the first support frame away from the isolation arch. The connecting rods are evenly distributed between the first support frame and the second support frame, and the two ends of the connecting rods are respectively connected to the first support frame and the second support frame.

4. The temporary tunnel support device according to claim 3, characterized in that: Each of the connecting rods is divided into a support rod and a reinforcement rod; The first support frame and the second support frame are both rectangular frame structures, and the support rods are connected between two opposite vertices of the first support frame and the second support frame; The reinforcing rod is connected between two adjacent support rods, one end of the reinforcing rod is connected to the position where one support rod is connected to the first support frame, and the other end of the reinforcing rod is connected to the position where the other support rod is connected to the second support frame.

5. The temporary tunnel support device according to claim 4, characterized in that: The first support frame, the second support frame, the support rod and the reinforcing rod are all made of rectangular tubes.

6. The temporary tunnel support device according to claim 1, characterized in that: The supporting arch portion further includes two supporting bases; the two supporting bases are spaced apart along the width direction of the constructed tunnel and are both supported on the ground of the constructed tunnel; One end of the isolation arch and one end of the support truss are both fixed at the top position of one support base; the other end of the isolation arch and the other end of the support truss are both fixed at the top position of another support base.

7. The temporary tunnel support device according to claim 1, characterized in that: It also includes two telescopic support parts that can be telescopic in the vertical direction; the two telescopic support parts are respectively arranged between the two ends of the isolation arch and the support truss and the ground.

8. The temporary tunnel support device according to claim 7, characterized in that: The telescopic support part includes a hydraulic base, a hydraulic support top and a hydraulic cylinder; The hydraulic base is supported on the ground of the tunnel being constructed, the hydraulic support top is spaced apart above the hydraulic base, the hydraulic cylinder is arranged between the hydraulic base and the hydraulic support top, and the piston rod of the hydraulic cylinder extends in the vertical direction; the hydraulic base is provided with an oil pump for transporting the hydraulic oil in the hydraulic cylinder.

9. The temporary tunnel support device according to claim 1, characterized in that: It also includes two mobile platform parts; the two mobile platform parts are respectively arranged between the isolation arch and the two ends of the support truss and the ground; The mobile platform part includes an adjustment platform, a sliding sleeve and a sliding rail; the adjustment platform is used to support the bottom of the isolation arch and the end of the support truss, the sliding rail extends along the direction of the constructed tunnel, and the sliding sleeve is installed on the adjustment platform and slidably set on the sliding rail.

10. A tunnel support method using the temporary tunnel support device according to any one of claims 1 to 9, characterized in that: The steps include: S1. Design Dimensions: Through investigation and testing, the specifications, surrounding rock stress and grade of the tunnel to be constructed are obtained, and the specifications and dimensions of the supporting arch, adjustment platform and slide rails of the temporary tunnel support device are designed; S2. Prefabricate the temporary tunnel support device: lay slide rails according to the direction of the tunnel to be constructed, assemble the slide sleeves on the slide rails; cast the adjustment platform of corresponding height on the slide sleeve according to pre-designed dimensions; after the adjustment platform solidifies, install the telescopic support part on the adjustment platform; Installing a support base above the telescopic support portion, assembling a support truss and an isolation arch above the support base; prefabricating a corresponding number of temporary tunnel support devices according to the required construction plan; S3. Remove the required distance of the tunnel primary support according to the required construction plan; S4, moving the temporary tunnel support device to below the exposed surrounding rock; adjusting the telescopic support portion, and lifting the temporary tunnel support device until the isolation arch contacts and supports the exposed surrounding rock; S5. Construction personnel and construction equipment are located under the temporary tunnel support device and remove the primary tunnel support of the next area according to the required construction plan; S6. Adjust the telescopic support portion, lower the temporary tunnel support device, and move the temporary tunnel support device to the next exposed surrounding rock; S7. Support the exposed surrounding rock after the temporary tunnel support device is removed.

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