CN107956492B - Temporary supporting device for broken mountain tunnel steel arch frame - Google Patents
Temporary supporting device for broken mountain tunnel steel arch frame Download PDFInfo
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- CN107956492B CN107956492B CN201711407224.4A CN201711407224A CN107956492B CN 107956492 B CN107956492 B CN 107956492B CN 201711407224 A CN201711407224 A CN 201711407224A CN 107956492 B CN107956492 B CN 107956492B
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- Prior art keywords
- steel arch
- telescopic
- rod
- control box
- rods
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
Abstract
The invention provides a temporary supporting device for a broken tunnel steel arch with mountain, and belongs to the technical field of tunnel structure safety. The supporting device comprises two end fixing devices, a telescopic supporting rod and a control box; the two ends of the telescopic supporting rod are respectively connected with an end fixing device, and the middle part of the telescopic supporting rod is provided with a control box. The telescopic support rod is used for adjusting the size of the whole support device and controlling the distance between the two end fixing devices so that the two end fixing devices are respectively positioned at the left side and the right side of the cross section of the tunnel; the control box is used for micro-adjusting the length of the telescopic supporting rod. The invention is mainly suitable for the design of lining supporting devices at broken zones of mountain tunnels; the steel arch can be subjected to fine adjustment according to the stress and deformation characteristic change of the steel arch, so that the stress of the steel arch is reasonable; the end fixing device is convenient to connect with the steel arch without complex fixing procedures, and is convenient and quick; the installation and the disassembly are convenient, and the access of vehicles and other mechanical equipment is not affected.
Description
Technical Field
The invention belongs to the technical field of tunnel structure safety, and particularly relates to a temporary steel arch supporting device which is suitable for a primary lining steel arch supporting structure when a broken belt is penetrated in mine tunnel construction.
Background
In mountain tunnel construction, a new Olympic method is generally used as a theoretical basis, namely, the self-supporting capability of surrounding rocks is used as a base point, an anchor rod and sprayed concrete are used as main supporting means, and the supporting is timely carried out, so that the deformation and the relaxation of the surrounding rocks are controlled, and the surrounding rocks become a component of a supporting system. However, in the construction process, the surrounding rock is weak in self-bearing capacity in a rock mass crushing area due to complex and changeable geological conditions of the surrounding rock, and particularly in a broken belt area, the surrounding rock structure is unstable, so that the safety of a tunnel is greatly influenced.
At present, a composite lining structure is commonly adopted in mountain tunnel construction, namely, after the step excavation on a tunnel chamber is completed, primary lining construction is timely carried out, a steel arch is erected, concrete is sprayed, and the stability of surrounding rock is improved. However, due to the restrictions of the space in the cavity and the construction trolley and the influence of the construction process, the primary lining cannot be timely sealed into a ring, and the construction of the secondary lining is often delayed from the primary lining, and the construction interval is generally more than 70 m. Before the primary lining is sealed into a ring, the end part of the steel arch is generally reinforced by adopting a foot locking anchor rod, but surrounding rock is broken in a broken belt, the reinforcing effect of the foot locking anchor rod is limited, and grouting can play an anchoring effect only after a period of time. Therefore, the primary lining collapse accident often occurs in the engineering, and the construction progress and the engineering safety are seriously affected.
At present, to limit the convergence deformation of a tunnel, a transverse supporting beam with two ends respectively hinged on the inner wall of the tunnel is generally adopted, and the beam can only limit the extrusion deformation of two sides of the tunnel and can not provide upward supporting force for a steel arch.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a temporary supporting device for a broken tunnel steel arch with mountain, which is used for transversely connecting the steel arches at the left side and the right side of a cavity to form a temporary closed loop supporting structure before a primary lining is closed into a loop.
In order to achieve the above object, the present invention provides the following technical solutions:
a temporary supporting device for a broken and broken mountain tunnel steel arch comprises two end fixing devices, a telescopic supporting rod and a control box; wherein, an end fixing device is connected respectively at the both ends of scalable bracing piece, and the middle part of scalable bracing piece sets up the control box. The two end fixing devices are respectively fixed at two ends of the steel arch; the telescopic support rod is used for adjusting the size of the whole support device through free expansion and contraction of the telescopic support rod, and controlling the distance between the two end fixing devices to enable the two end fixing devices to be respectively positioned at the left end and the right end of the steel arch; the control box is used for micro-adjusting the length of the telescopic supporting rod.
The end fixing device comprises a fixed end box body with an opening at the front, a plurality of telescopic needles and a plurality of springs; wherein, a plurality of springs are distributed on the back wall inboard of stiff end box, and an expansion needle is embedded to every spring, and all expansion needles all can follow the place ahead of stiff end box and open and extend.
When the outer end part of the telescopic needle acts on the steel arch, a part of springs are extruded under the action of force, and the telescopic needles on the springs retract into the fixed end box body; meanwhile, the telescopic needles distributed around the steel arch without contacting the steel arch remain the same; the telescopic needles on the left side and the right side of the steel arch are limited to slide left and right, the steel arch is limited and fixed, and the steel arch is embedded into a groove consistent with the shape of the steel arch.
The telescopic support rod can be optionally telescopic, and the size of the whole support device can be adjusted in a large range according to the cross section size of the tunnel. In a preferred embodiment, the telescopic support rod comprises a left telescopic support rod and a right telescopic support rod, and the left telescopic support rod and the right telescopic support rod comprise a plurality of telescopic rods which are sequentially connected in a nested manner. By way of example and not limitation, the shaft of the telescoping rod may be provided with a bar-shaped opening and connected to the telescoping rod nested therewith using a bolt.
The control box comprises a micro-adjustment control rod, a control box body with left and right ends open and two connecting rods; the micro-adjusting control rod is arranged on the control box body in a penetrating way, and the two connecting rods are arranged in the control box body; one end of each of the two connecting rods is rotatably connected with the lower end of the micro-adjustment control rod, and in a preferred embodiment, the two connecting rods can be coaxially rotatably connected with the lower end of the micro-adjustment control rod; the other ends of the two connecting rods are respectively connected with the right end of the left telescopic supporting rod and the left end of the right telescopic supporting rod in a rotating way.
When the fine adjustment control rod moves downwards under the action of external force, the left telescopic support rod and the right telescopic support rod move leftwards and rightwards under the action of the two connecting rods respectively, and the steel arch is compressed to play a supporting role. When the fine adjustment control rod moves upwards, the left telescopic support rod and the right telescopic support rod shrink towards the middle under the action of the two connecting rods respectively.
Further, the top of control box is provided with the opening, and the opening below is provided with the fixed channel that suits with this opening shape and size, and fine adjustment control rod wears to locate on the control box through this fixed channel. The fixed channel comprises lateral wall and diapire, is provided with the profile of tooth draw-in groove on the lateral wall, has seted up the export on the diapire, and the lower extreme of fine setting control lever passes this export and extends to the control box inside and two connecting rods rotation connection.
Further, a pull rod is arranged in the micro-adjusting control rod, the lower end of the pull rod is connected with the middle parts of the two fixing rods through a hinge, and a compression spring is arranged between the two fixing rods; one end of each of the two fixing rods is rotatably connected with the lower part of the fine adjustment control rod, and in a preferred embodiment, the two fixing rods can be coaxially rotatably connected with the lower part of the fine adjustment control rod; the other ends of the two fixing rods are opened to two sides respectively under the action of the compression springs and are embedded in the tooth-shaped clamping grooves.
The working mode of the temporary supporting device for the broken mountain tunnel steel arch frame comprises the following steps: after the excavation of the upper step is completed, a groove is excavated on the soil body of the unexcavated lower step, the temporary supporting device of the broken tunnel steel arch with the mountain is placed in the groove, the telescopic supporting rods are opened, the end fixing devices at the two ends are contacted with the ends of the steel arch, the control box is operated to conduct micro-adjustment according to the fixing requirement of the steel arch, and after the adjustment is completed according to the requirement, the groove is backfilled by backfill, so that the entry and exit of a dregs car and other mechanical equipment are not influenced.
The temporary supporting device for the broken mountain tunnel steel arch provided by the invention can adjust the fixing devices at the two ends according to the sizes of the steel arch so as to be suitable for steel arches with different specifications and different sizes, can provide upward supporting force for the steel arch, and can limit the left-right swing of the steel arch. Meanwhile, the length of the telescopic supporting rod can be adjusted according to the section size of the tunnel so as to be suitable for mountain tunnels with different section sizes.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) The invention is mainly suitable for the design of lining supporting devices at broken zones of mountain tunnels;
(2) The invention can carry out fine adjustment according to the stress and deformation characteristic change of the steel arch so that the stress of the steel arch is reasonable;
(3) The end fixing devices at the two ends of the invention are conveniently connected with the steel arch without complex fixing procedures, thereby being convenient and quick;
(4) The invention is convenient to assemble and disassemble, and does not influence the in-out of vehicles and other mechanical equipment.
Drawings
FIG. 1 is a schematic installation view of a temporary supporting device for a broken mountain tunnel steel arch;
FIG. 2 is a schematic structural view of a temporary supporting device for a broken mountain tunnel steel arch;
FIG. 3 is a side view of the end fixture;
FIG. 4 is a front view of the end fixture;
FIG. 5 is a schematic diagram of a control box;
fig. 6 is a schematic view of a fine adjustment lever.
Description of the reference numerals
1. Tunnel primary lining
2. Steel arch
3 end fixing device, 3-1 fixed end box, 3-2 telescopic needle, 3-3 spring
4 telescopic support rod
5 control box, 5-1 micro-adjusting control rod, 5-2 control box body, 5-3 connecting rod, 5-4 pull rod, 5-5 tooth-shaped clamping groove, 5-6 fixing rod and 5-7 compression spring
6 backfill soil
Detailed Description
The technical scheme of the temporary supporting device for the broken and broken mountain tunnel steel arch provided by the invention is further described below with reference to specific embodiments and attached drawings. The advantages and features of the present invention will become more apparent in conjunction with the following description.
It should be noted that the embodiments of the present invention are preferred embodiments, and are not intended to limit the present invention in any way. The technical features or combinations of technical features described in the embodiments of the present invention should not be regarded as isolated, and they may be combined with each other to achieve a better technical effect. Additional implementations are also included within the scope of the preferred embodiments of the present invention and should be understood by those skilled in the art to which the embodiments of the present invention pertain.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative and not limitative. Thus, other examples of the exemplary embodiments may have different values.
The drawings of the invention are in a very simplified form and are not to scale precisely, but are for the purpose of illustrating embodiments of the invention conveniently and clearly, and are not intended to limit the scope of the invention. Any structural modification, proportional change or size adjustment should fall within the scope of the technical disclosure without affecting the effects and the achieved objects of the present invention. And the same reference numerals appearing in the drawings of the present invention denote the same features or elements, and may be used in different embodiments.
As shown in fig. 1 to 6, the invention provides a temporary supporting device for a broken and crushed mountain tunnel steel arch, which comprises two end fixing devices 3, a telescopic supporting rod 4 and a control box 5; wherein, the both ends of scalable bracing piece 4 are connected a tip fixing device 3 respectively, and the middle part of scalable bracing piece 4 sets up control box 5. The two end fixing devices 3 are respectively used for fixing the two ends of the steel arch 2; the telescopic supporting rod 4 is used for adjusting the size of the whole supporting device through free telescopic operation of the telescopic supporting rod, and controlling the distance between the two end fixing devices 3, so that the two end fixing devices 3 are respectively positioned at the left end and the right end of the steel arch 2; the control box 5 is used for micro-adjusting the length of the telescopic supporting rod 4.
The end fixing device 3 comprises a fixed end box body 3-1 with an open front, a plurality of telescopic needles 3-2 and a plurality of springs 3-3; wherein, a plurality of springs 3-3 are distributed on the inner side of the rear wall of the fixed end box body 3-1, for example, 8 rows by 20 columns of springs 3-3 can be distributed on the inner side of the rear wall of the fixed end box body 3-1; further, a retractable needle 3-2 is embedded in each spring 3-3, and all the retractable needles 3-2 can extend out from the front opening of the fixed end box 3-1.
When the outer end of the telescopic needle 3-2 acts on the steel arch 2, a part of springs 3-3 are extruded under the action of force, and the telescopic needle 3-2 on the springs 3-3 is retracted into the fixed end box body 3-1; meanwhile, the telescopic needles 3-2 which are distributed around the steel arch 2 and are not contacted with the steel arch 2 are kept as they are; thereby, the telescopic needles 3-2 at the lower part of the steel arch 2 provide supporting force for the steel arch, the telescopic needles at the left side and the right side of the steel arch 2 limit the left-right sliding of the steel arch 2, the steel arch 2 is limited and fixed, and the steel arch 2 is embedded into a groove with the same shape as the steel arch.
The telescopic supporting rod 4 can be optionally telescopic, and the size of the whole supporting device can be adjusted in a large range according to the cross section size of the tunnel. In a preferred embodiment, the telescopic support rod 4 comprises a left telescopic support rod and a right telescopic support rod, and the left telescopic support rod and the right telescopic support rod comprise a plurality of telescopic rods which are nested and connected in sequence. By way of example and not limitation, the shaft of the telescoping rod may be provided with a bar-shaped opening and connected to the telescoping rod nested therewith using a bolt.
The control box 5 comprises a micro-adjustment control rod 5-1, a control box body 5-2 with left and right ends open and two connecting rods 5-3; the micro-adjustment control rod 5-1 vertically penetrates through the control box body 5-2, and the two connecting rods 5-3 are both arranged in the control box body 5-2; one end of each of the two connecting rods 5-3 is rotatably connected with the lower end of the fine adjustment control rod 5-1, and in a preferred embodiment, the two connecting rods 5-3 can be coaxially rotatably connected with the lower end of the fine adjustment control rod 5-1; the other ends of the two connecting rods 5-3 are respectively connected with the right end of the left telescopic supporting rod and the left end of the right telescopic supporting rod in a rotating way. By way of example and not limitation, the pivotal connections may be hinged.
When the fine adjustment control rod 5-1 moves downwards under the action of external force, the left telescopic support rod and the right telescopic support rod move leftwards and rightwards under the action of the two connecting rods 5-3 respectively, so that the steel arch 2 is compressed and supported. When the fine adjustment control rod 5-1 moves upwards, the left telescopic support rod and the right telescopic support rod shrink towards the middle under the action of the two connecting rods 5-3 respectively.
Further, an opening is formed in the top of the control box body 5-2, a fixed channel which is matched with the opening in shape and size is formed below the opening, and the fine adjustment control rod 5-1 passes through the fixed channel and is arranged on the control box body 5-2 in a penetrating mode. The fixed channel is composed of a side wall and a bottom wall, the side wall is provided with a tooth-shaped clamping groove 5-5 with a notch obliquely downward, the bottom wall is provided with an outlet, and the lower end of the fine adjustment control rod 5-1 penetrates through the outlet to extend into the control box body 5-2 to be rotationally connected with the two connecting rods 5-3.
Further, a pull rod 5-4 is arranged in the fine adjustment control rod 5-1, the lower end of the pull rod 5-4 is connected with the middle parts of two fixing rods 5-6 through a hinge, and a compression spring 5-7 is arranged between the two fixing rods 5-6; one end of each of the two fixing rods 5-6 is rotatably connected with the lower part of the fine adjustment control rod 5-1, for example, the two fixing rods 5-6 can be hinged, and in a preferred embodiment, the two fixing rods 5-6 can be coaxially rotatably connected with the lower part of the fine adjustment control rod 5-1; the other ends of the two fixing rods 5-6 are respectively opened to two sides under the action of the compression springs 5-7 and are embedded in the tooth-shaped clamping grooves 5-5.
When the steel arch 2 is tightly pressed, the micro-adjustment control rod 5-1 moves downwards under the action of external force through the control box 5, meanwhile, the fixing rod 5-6 also moves downwards, the other end of the fixing rod 5-6 is embedded in the tooth-shaped clamping groove 5-5 under the action of the compression spring 5-7, the micro-adjustment control rod 5-1 is limited to move upwards, and pressing can be stopped when the end fixing devices 3 at two ends meet the requirement.
When the steel arch 2 is loosened, the pull rod 5-4 is pulled upwards, the end part of the fixed rod 5-6 leaves the tooth-shaped clamping groove 5-5 under the action of external force, at the moment, the fine adjustment control rod 5-1 is pulled upwards, the fine adjustment control rod 5-1 drives the connecting rod 5-3, the telescopic support rod 4 moves towards the middle, and when the end part fixing devices 3 at the two ends meet the requirement, the pull rod 5-4 can be stopped to lift up.
The working mode of the temporary supporting device for the broken mountain tunnel steel arch frame comprises the following steps: after the excavation of the upper step is completed, a groove is excavated on the soil body of the unexcavated lower step, the temporary supporting device of the broken tunnel steel arch with mountain is placed in the groove, the telescopic supporting rods 4 are opened, the end fixing devices 3 at the two ends are contacted with the end parts of the steel arch 2, the control box 5 is operated to perform micro-adjustment according to the fixing requirement of the steel arch 2, and after the adjustment is completed as required, the groove is backfilled by backfill soil 6, so that the entry and exit of a dregs car and other mechanical equipment are not influenced.
The temporary supporting device for the broken mountain tunnel steel arch provided by the invention can adjust the fixing devices at the two ends according to the sizes of the steel arch so as to be suitable for steel arches with different specifications and different sizes, can provide upward supporting force for the steel arch, and can limit the left-right swing of the steel arch. Meanwhile, the length of the telescopic supporting rod can be adjusted according to the section size of the tunnel so as to be suitable for mountain tunnels with different section sizes.
The above description is only illustrative of the preferred embodiments of the invention and is not intended to limit the scope of the invention in any way. Any alterations or modifications of the invention, which are obvious to those skilled in the art based on the teachings disclosed above, are intended to be equally effective embodiments, and are intended to be within the scope of the appended claims.
Claims (6)
1. Temporary supporting device for broken mountain tunnel steel arch frame is characterized in that: comprises two end fixing devices (3), a telescopic supporting rod (4) and a control box (5);
two ends of the telescopic supporting rod (4) are respectively connected with an end fixing device (3), and a control box (5) is arranged in the middle of the telescopic supporting rod (4);
the two end fixing devices (3) are respectively fixed at two ends of the steel arch (2); the telescopic supporting rod (4) adjusts the size of the whole supporting device through free expansion and contraction of the telescopic supporting rod, and controls the distance between the two end fixing devices (3) to enable the two end fixing devices (3) to be respectively positioned at the left end and the right end of the steel arch (2); the control box (5) is used for micro-adjusting the length of the telescopic supporting rod (4);
the end fixing device (3) comprises a fixed end box body (3-1) with an opening front, a plurality of telescopic needles (3-2) and a plurality of springs (3-3);
a plurality of springs (3-3) are distributed on the inner side of the rear wall of the fixed end box body (3-1), and a telescopic needle (3-2) is embedded in each spring (3-3); the telescopic needles (3-2) acting on the two ends of the steel arch (2) are compressed through the springs (3-3) and limit the left-right movement of the steel arch (2); the telescopic needles (3-2) which are distributed around the steel arch (2) and are not contacted with the steel arch (2) are kept in the original state, and the telescopic needles (3-2) positioned at the lower part of the steel arch (2) provide support for the steel arch (2);
the telescopic support rod (4) comprises a left telescopic support rod and a right telescopic support rod;
the left telescopic supporting rods and the right telescopic supporting rods comprise a plurality of telescopic rods which are sequentially connected in a nested manner and freely telescopic through the telescopic rods;
the control box (5) comprises a micro-adjusting control rod (5-1), a control box body (5-2) with left and right ends open and two connecting rods (5-3);
the fine adjustment control rod (5-1) is arranged on the control box body (5-2) in a penetrating way, and the two connecting rods (5-3) are arranged in the control box body (5-2); one end of each of the two connecting rods (5-3) is rotationally connected with the lower end of the micro-adjusting control rod (5-1), and the other ends of the two connecting rods (5-3) are rotationally connected with the right end of the left telescopic supporting rod and the left end of the right telescopic supporting rod respectively.
2. The broken mountain tunnel steel arch temporary support device according to claim 1, wherein: the telescopic rod body is provided with a strip-shaped opening and is connected with the telescopic rod nested with the strip-shaped opening by bolts.
3. The broken mountain tunnel steel arch temporary support device according to claim 1, wherein: one end of the two connecting rods (5-3) is coaxially and rotatably connected with the lower end of the fine adjustment control rod (5-1).
4. The broken mountain tunnel steel arch temporary support device according to claim 1, wherein: an opening is formed in the top of the control box body (5-2), a fixed channel which is matched with the opening in shape and size is formed below the opening, and the fine adjustment control rod (5-1) passes through the fixed channel and is arranged on the control box body (5-2) in a penetrating manner;
the fixed channel is composed of a side wall and a bottom wall, an outlet is formed in the bottom wall, and the lower end of the fine adjustment control rod (5-1) penetrates through the outlet and extends to the inside of the control box body (5-2) to be rotationally connected with the two connecting rods (5-3).
5. The broken mountain tunnel steel arch temporary support device of claim 4, wherein: tooth-shaped clamping grooves (5-5) are formed in the side walls;
the micro-adjusting control rod (5-1) is internally provided with a pull rod (5-4), the lower end of the pull rod (5-4) is connected with the middle parts of two fixed rods (5-6) through a hinge, and a compression spring (5-7) is arranged between the two fixed rods (5-6); one end of each of the two fixing rods (5-6) is rotationally connected with the lower part of the micro-adjusting control rod (5-1), and the other ends of the two fixing rods (5-6) are respectively opened to two sides under the action of the compression springs (5-7) and are embedded in the tooth-shaped clamping grooves (5-5).
6. The broken mountain tunnel steel arch temporary support device of claim 5, wherein: the two fixing rods (5-6) are coaxially and rotatably connected with the lower parts of the fine adjustment control rods (5-1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711407224.4A CN107956492B (en) | 2017-12-22 | 2017-12-22 | Temporary supporting device for broken mountain tunnel steel arch frame |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711407224.4A CN107956492B (en) | 2017-12-22 | 2017-12-22 | Temporary supporting device for broken mountain tunnel steel arch frame |
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| CN107956492A CN107956492A (en) | 2018-04-24 |
| CN107956492B true CN107956492B (en) | 2023-09-22 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110333136B (en) * | 2019-08-08 | 2024-03-29 | 西南交通大学 | Fault dislocation test device for simulating multi-angle crossing fault of deep buried tunnel |
| CN113513337A (en) * | 2021-03-04 | 2021-10-19 | 浙江交工集团股份有限公司 | Arch-free supporting tunnel passing through vault crushing section supporting structure and construction method thereof |
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| US20060059859A1 (en) * | 2004-08-05 | 2006-03-23 | Knerr Jacoby L | Arch support device |
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| WO2001051769A1 (en) * | 2000-01-11 | 2001-07-19 | Nordmarkens Betongprodukter Aktiebolag | Arc construction |
| CN204162995U (en) * | 2014-06-30 | 2015-02-18 | 同济大学 | Umbrella shaft type stretching device |
| CN104989421A (en) * | 2015-07-29 | 2015-10-21 | 中交第一公路勘察设计研究院有限公司 | Support structure for preventing settlement deformation of tunnels and construction method thereof |
| CN205977252U (en) * | 2016-08-23 | 2017-02-22 | 王道远 | Reinforcing lock foot stock the stiffness's connection structure |
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| CN107956492A (en) | 2018-04-24 |
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