CN110273697B - Prestressed supporting device and method for tunnel connecting channel excavation - Google Patents
Prestressed supporting device and method for tunnel connecting channel excavation Download PDFInfo
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- CN110273697B CN110273697B CN201910443974.XA CN201910443974A CN110273697B CN 110273697 B CN110273697 B CN 110273697B CN 201910443974 A CN201910443974 A CN 201910443974A CN 110273697 B CN110273697 B CN 110273697B
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000010276 construction Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 230000008014 freezing Effects 0.000 claims description 6
- 238000007710 freezing Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a prestress supporting device for tunnel connecting channel excavation, which is characterized by comprising a polygonal frame which is suitable for the section of a tunnel connecting channel, wherein a jack which extends outwards is arranged at the top of the intersecting angle of a stressed frame of the polygonal frame; the left side and the right side of the polygonal frame are symmetrical, and the frames are hinged by adopting pin shafts; the jack is connected with the structure that hinge lugs are arranged on the jack base and are hinged with the two frames together through the hinge lugs. After the opening of the connecting channel is formed, a truss frame is respectively arranged at the joint of the duct piece at two sides of the opening, so that all jacks are supported on the wall of the opening, and the tunnel engineering at the opening is not influenced and the construction safety is ensured in the construction process.
Description
Technical Field
The invention belongs to the technical field of tunnel excavation.
Background
With the modern development of cities, the development and utilization of urban underground space are increasingly remarkable, and more underground traffic facilities such as subways, tunnels and the like are put into construction. In tunnel engineering construction, in order to ensure engineering safety, convenient maintenance and setting auxiliary facilities such as pump house, etc., meeting fire safety requirements, a communication channel (communication lane) is generally required to be constructed between two parallel tunnels. The direction of the communication channel is generally perpendicular to the direction of the tunnel. In tunnel excavation engineering, a freezing method is adopted in a region with a flowing sand layer or a large water content, the sand layer is frozen and then the construction is carried out, and the internal stress of the concrete wall constructed after the freezing is larger and larger along with later thawing. When a connecting channel opening is opened at one side of a tunnel, once the original state of the original concrete wall is destroyed, stress is lost, so that the established tunnel is deformed, and the frozen pipe is broken or even the tunnel collapses due to overlarge deformation, thereby influencing the engineering quality of the whole tunnel. Therefore, in order to ensure the tunnel engineering quality and prevent deformation and collapse, the original tunnel needs to be reinforced and supported during construction of the connecting channel, and a certain prestress is given, so that no supporting device exists in the market at present.
Disclosure of Invention
The invention aims to design a prestress supporting device for tunnel connecting channel excavation,
Meanwhile, the supporting method using the device is provided, and the requirement of preventing deformation of the tunnel reinforcing support is met.
The technical proposal of the invention is that a prestress supporting device for tunnel connecting channel excavation
The tunnel is characterized by comprising a polygonal frame which is suitable for the section of a tunnel, wherein the frames of the polygonal frame are symmetrically arranged left and right, and the frames are hinged by adopting pin shafts; the top of the intersection angle of the two stressed frames is provided with a jack which extends outwards; the jack is connected with the structure that a hinge lug is arranged on the jack base and is hinged with the two stressed frames together through the hinge lug.
Furthermore, the polygonal frame is a regular polygonal frame suitable for a circular tunnel section, and jacks are arranged at the tops of all the intersecting angles around the polygonal frame.
Further, the regular polygon frame suitable for the circular tunnel section is preferably an octagon or decagon.
Further, the polygonal frame is a polygonal frame suitable for the section of the arched channel, wherein at least four frames are arranged at the arched part, one frame is respectively arranged at the two side vertical wall parts and is in an inner splayed shape, and one frame is arranged at the bottom plate part of the tunnel.
Further, the polygonal frame is a polygonal frame suitable for an arch tunnel section, wherein at least four frames are arranged at the arch part, one frame is arranged at each of two side vertical wall parts and is vertical, two frames are hinged at the bottom plate part, and the two bottom plate frames are in an inner angle smaller than 180 degrees and larger than 135 degrees and are supported in a lower horizontal groove of the tunnel bottom plate.
Further, the frame is formed by processing section steel.
The prestress supporting method provided by the invention comprises the following steps:
The prestress supporting method for tunnel connecting channel excavation by utilizing the prestress supporting device comprises the following steps:
Firstly, before a tunnel connecting channel opening is excavated, transporting a polygonal frame and a jack which are suitable for a tunnel section into the tunnel to be assembled and formed, detecting deformation stress of the tunnel at two sides of the opening, respectively arranging a truss of prestress supporting devices at two sides of the opening, supporting the periphery of the tunnel, and applying prestress to each supporting point by using the jack according to the deformation stress detection condition;
secondly, excavating a tunnel connecting channel hole, continuously monitoring the surface temperature and the convergence deformation condition of the frozen wall of the tunnel in real time in the excavating process, and adjusting the jack corresponding to the deformation position in time according to the deformation stress of each monitored point so as to control the frozen wall to be in the designed deformation range; when the supporting pressure of the prestress supporting device is insufficient to control deformation, more than one prestress supporting device can be added for supplementing;
And thirdly, when normal excavation construction is carried out after entering the tunnel portal, an operation mode of following excavation and supporting is adopted, temporary support is reinforced, deformation of a communication channel is controlled, and influence on the later-stage quality of the tunnel is reduced.
Further, when the selected bottom frame of the polygonal frame is formed by hinging two side frames, a lower horizontal groove which is suitable for the inner angle of the bottom frame is required to be constructed on the bottom plate of the tunnel in the first step.
The invention has the positive effects that:
1. The prestress supporting device for the tunnel connecting channel is provided, prestress is applied to each supporting point by a jack according to the deformation stress condition of the tunnel before and during the excavation of the connecting channel hole, the tunnel is prevented from being deformed, and the breakage of a freezing pipe caused by overlarge deformation of a freezing wall is avoided.
2. The invention is connected by the pin shaft, and is convenient to be disassembled and installed in a narrow tunnel.
3. The jack is installed and connected at the top of the intersection angle of the two stressed frames, so that each frame is a pressure receiving piece and is free from bending moment, and the frame member is simple in design, stable and portable as a whole.
Drawings
FIG. 1 is a schematic diagram of example 1;
FIG. 2 is a schematic diagram of example 2;
FIG. 3 is a schematic diagram of example 3;
FIG. 4 is a schematic diagram of example 4;
FIG. 5 is an enlarged view of a portion of FIG. 1 showing the connection structure of the jack;
Fig. 6 is a side view of fig. 5.
Detailed Description
Example 1
As shown in figure 1, the prestress supporting device suitable for excavating a connecting channel of a tunnel with a circular section comprises a regular octagonal frame 2 suitable for the section of the tunnel, wherein the frame of the octagonal frame 2 is formed by processing profile steel, and the two frames are hinged by a pin shaft; the top of the intersection angle of the two stressed frames of the regular octagonal frame 2 is provided with a jack 1 which extends outwards; the connection structure of the jack 1 is shown in fig. 5 and 6, the jack base is provided with a hinge lug, and the hinge lug and the two frames are hinged together.
The prestress support during excavation of the circular section tunnel connecting channel is as follows:
Firstly, before a circular section tunnel connecting channel opening is excavated, conveying an octagonal frame and a jack which are suitable for the tunnel section into the tunnel for assembly forming, detecting deformation stress of the tunnel at two sides of the opening, respectively arranging a truss supporting device at two sides of the opening, supporting the periphery of the tunnel, and applying prestress to all supporting points by the jack according to the deformation stress detection condition;
secondly, excavating a tunnel connecting channel hole, continuously monitoring the surface temperature and the convergence deformation condition of the frozen wall of the tunnel in real time in the excavating process, and adjusting the jack corresponding to the deformation position in time according to the deformation stress of each monitored point so as to control the frozen wall to be in the designed deformation range; when the supporting pressure of the prestress supporting device is insufficient to control deformation, more than one prestress supporting device can be added for supplementing;
And thirdly, when normal excavation construction is carried out after entering the tunnel portal, an operation mode of following excavation and supporting is adopted, temporary support is reinforced, deformation of a freezing wall of the communication channel is controlled, and influence on the later quality of the tunnel is reduced.
Example 2
As shown in figure 2, the prestress supporting device for excavating a connecting channel of an arch-shaped section tunnel comprises a heptagon frame 2 which is suitable for the arch-shaped section tunnel, wherein the heptagon frame 2 is formed by processing profile steel, and a frame is hinged with the frame by adopting a pin shaft; four frames are arranged at the arched part of the tunnel, one frame is arranged at each of the two side standing wall parts, one frame is arranged at the bottom part of the tunnel, the frames at the two side standing wall parts are support legs 3 in the shape of an inner splay, one frame at the bottom is called a support floor beam 5, and the support floor beam 5 is supported on the bottom plate of the tunnel; the tops of the stress intersection angles of the two frames of the heptagon frame 2 are provided with jacks 1 which extend outwards; the connection structure of the jack 1 is shown in fig. 5 and 6, the jack base is provided with a hinge lug, and the hinge lug and the two frames are hinged together.
The method for supporting the prestress during the excavation of the tunnel connecting channel in the embodiment is the same as that in the embodiment 1; the method is suitable for tunnels with large deformation stress at arch parts of the tunnels and small deformation stress at two sides and bottom, the supporting ground beams 5 are tension members, and the supporting mode can ensure that the tunnels have larger section space and other working procedures are carried out.
Example 3
As shown in figure 3, the prestress supporting device for excavating the connecting channel of the tunnel with the arch section comprises an octagonal frame 2 which is suitable for the tunnel with the arch section, wherein the octagonal frame 2 is formed by processing profile steel, and a frame is hinged with the frame by adopting a pin shaft; the arch part of the tunnel is provided with four frames, two vertical frames are respectively arranged at two side vertical wall parts and are called supporting legs 3, and the two frames at the bottom are hinged to form a lower lying supporting frame 6, form an inner angle smaller than 180 degrees and larger than 135 degrees and are supported in a lower lying groove of the bottom plate of the tunnel. The jacks 1 which extend outwards are arranged at the tops of the intersecting angles of the two stressed frames of the octagonal frame 2 (excluding the lower lying supporting frame 6); the connection structure of the jack 1 is shown in fig. 5 and 6, the jack base is provided with a hinge lug, and the hinge lug and the two frames are hinged together.
The prestress supporting method used in the tunnel connecting channel excavation is the same as that of the embodiment 1, but in the first step, a lower horizontal groove which is suitable for the inner angle of a bottom frame is required to be constructed on a tunnel bottom plate; the support type is suitable for tunnels with large deformation stress at arch parts of the tunnels, small deformation stress at two side parts and large bottom deformation stress, and the support type can ensure that the tunnels have the largest section space to ensure the execution of other working procedures.
Example 4
As shown in figure 4, the prestress supporting device suitable for the excavation of the connecting channel of the tunnel with the arch section comprises a polygonal frame 2 suitable for the tunnel with the arch section, which is a frame with symmetrical left and right sides, and the frames are hinged by pin shafts; the arched part is provided with four frames, two vertical frames are respectively arranged at two side vertical wall parts and are called supporting legs 3, the tunnel bottom plate part is provided with one frame and is a metal flat bar 7, and the rest frames are formed by processing section steel; the metal flat strip 7 plays a role of fixing the supporting leg 3; the top of the intersection angle of the two stressed frames of the polygonal frame 2 is provided with a jack 1 which extends outwards; the connection structure of the jack 1 is shown in fig. 5 and 6, and the jack base is provided with a hinge lug which is hinged with the two frames together.
The method for supporting the prestress during the excavation of the tunnel connecting channel in the embodiment is the same as that in the embodiment 1; this example is applicable to tunnel two group and the condition of bottom plate non-deformable, and top deformation stress acts on supporting leg 3 and supporting leg 4: the support form can ensure that the tunnel has the largest section space to ensure the progress of other working procedures.
Claims (6)
1. The prestress supporting device for tunnel connecting channel excavation comprises a polygonal frame which is suitable for tunnel section, wherein the frames of the polygonal frame are symmetrically arranged left and right, and jacks which extend outwards are arranged at the tops of the intersecting angles of two stressed frames; the frame is characterized in that the frames are hinged by adopting pin shafts; the jack is connected with the structure that a hinge lug is arranged on a base of the jack and is hinged with two stressed frames together through the hinge lug;
The polygonal frame is a regular polygonal frame suitable for a circular tunnel section, and jacks are arranged at the tops of all the intersecting angles around the polygonal frame; according to the deformation stress of each point, the jack corresponding to the deformation position is timely adjusted to control the freezing wall within the designed deformation range;
The polygonal frame is or is suitable for the cross section of an arched tunnel, wherein at least four frames are arranged at the arched part, one frame is respectively arranged at the two side vertical wall parts and is in an inward splayed shape, and one frame is arranged at the bottom plate part of the tunnel;
the polygonal frame is or is suitable for the cross section of an arched tunnel, wherein at least four frames are arranged at the arched part, one frame is arranged at each of two side vertical wall parts and is vertical, the tunnel bottom plate part is formed by hinging two frames and takes an inner angle of less than 180 degrees and more than 135 degrees, and the polygonal frame is supported in a lower horizontal groove of the tunnel bottom plate;
The polygonal frame is suitable for the section of an arched tunnel, wherein at least four frames are arranged at the arched position, a vertical frame is arranged at each of two side vertical wall positions, a frame is arranged at the bottom plate of the tunnel, supporting feet are arranged at the bottoms of the vertical frames, the frame at the bottom of the tunnel is connected between the two supporting feet, the frame at the bottom of the tunnel is formed by processing metal flat bars, and the rest frames are formed by processing section steel.
2. The pre-stressed support of claim 1, wherein the regular polygon frame is hexagonal.
3. The pre-stress support device of claim 1, wherein the regular polygonal frame is octagonal.
4. The pre-stressing support device according to claim 1, characterized in that the rim of the polygonal frame is formed by machining of profile steel.
5. A method of pre-stressing a tunnel junction with the pre-stressing device of claim 1, comprising:
firstly, before a tunnel connecting channel opening is excavated, transporting a polygonal frame and a jack which are suitable for a tunnel section into the tunnel to be assembled and formed, detecting deformation stress of the tunnel at two sides of the opening, and then respectively arranging a truss of prestress supporting devices at two sides of the opening to support the periphery of the tunnel, and applying prestress to each supporting point by using the jack according to the deformation stress detection condition;
Secondly, excavating a tunnel connecting channel hole, continuously monitoring the surface temperature and the convergence deformation condition of the frozen wall of the tunnel in real time in the excavating process, and adjusting the jack corresponding to the deformation position in time according to the deformation stress of each monitored point so as to control the frozen wall to be in the designed deformation range; when the supporting stress of the prestress supporting device is insufficient to control the deformation, more than one prestress supporting device can be added for supplementing;
And thirdly, when normal excavation construction is carried out after entering the tunnel portal, an operation mode of following excavation and supporting is adopted, temporary support is reinforced, deformation of a communication channel is controlled, and influence on the later-stage quality of the tunnel is reduced.
6. A method of pre-stressing a tunnel junction with the pre-stressing device of claim 1, comprising:
Firstly, before a tunnel connecting channel opening is excavated, transporting a polygonal frame and a jack which are suitable for a tunnel section into a tunnel to be assembled and formed, detecting deformation stress of the tunnel at two sides of the opening, constructing lower horizontal grooves which are suitable for inner angles of a bottom frame on tunnel bottom plates at two sides of the opening, respectively arranging a truss prestress supporting device, supporting the periphery of the tunnel, and applying prestress to supporting points by the jack according to deformation stress detection conditions;
Secondly, excavating a tunnel connecting channel hole, continuously monitoring the surface temperature and the convergence deformation condition of the frozen wall of the tunnel in real time in the excavating process, and adjusting the jack corresponding to the deformation position in time according to the deformation stress of each monitored point so as to control the frozen wall to be in the designed deformation range; when the supporting stress of the prestress supporting device is insufficient to control the deformation, more than one prestress supporting device can be added for supplementing;
And thirdly, when normal excavation construction is carried out after entering the tunnel portal, an operation mode of following excavation and supporting is adopted, temporary support is reinforced, deformation of a communication channel is controlled, and influence on the later-stage quality of the tunnel is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910443974.XA CN110273697B (en) | 2019-05-27 | 2019-05-27 | Prestressed supporting device and method for tunnel connecting channel excavation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910443974.XA CN110273697B (en) | 2019-05-27 | 2019-05-27 | Prestressed supporting device and method for tunnel connecting channel excavation |
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| CN110273697A CN110273697A (en) | 2019-09-24 |
| CN110273697B true CN110273697B (en) | 2024-05-24 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523775A (en) * | 2020-12-29 | 2021-03-19 | 广州轨道交通建设监理有限公司 | Novel contact channel prestress support device |
| CN112963007B (en) * | 2021-02-25 | 2024-05-14 | 河南鼎力人防设备有限公司 | Door opening supporting device for installing civil air defense door |
| CN113944487A (en) * | 2021-10-27 | 2022-01-18 | 浙江工业大学 | Shield constructs contact passageway section of jurisdiction bearing structure |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2590930A1 (en) * | 1985-11-29 | 1987-06-05 | Douaisis Sabes Stephanoise | MINING SLAUGHTER |
| CN86203486U (en) * | 1986-05-23 | 1987-10-03 | 煤炭工业部煤炭科学研究院重庆研究所 | Simple hydraulic support with slided top beam |
| CN1067706A (en) * | 1992-03-20 | 1993-01-06 | 朱国志 | Hydraulic arch support for soft-rock tunnel |
| CN201190575Y (en) * | 2008-05-26 | 2009-02-04 | 郑州四维机电设备制造有限公司 | Connecting bar type hydraulic support at fully-mechanized mining working faces for thin seam |
| CN102052083A (en) * | 2010-12-09 | 2011-05-11 | 中国矿业大学 | Polygonal hydraulic active support bracket |
| CN201991536U (en) * | 2011-03-22 | 2011-09-28 | 中建市政建设有限公司 | Device for replacing tail brush in shield tunneling process |
| CN206111211U (en) * | 2016-08-27 | 2017-04-19 | 中国建筑第六工程局有限公司 | A regular polygon prestressing force support for preventing circular tunnel deformation of side opening |
| CN206418479U (en) * | 2017-01-06 | 2017-08-18 | 长江水利委员会长江科学院 | One kind has the automatic tie rod system of cable feeler lever |
| CN210152680U (en) * | 2019-05-27 | 2020-03-17 | 山东科技大学 | Prestressing force strutting arrangement who uses when tunnel connection passageway excavates |
-
2019
- 2019-05-27 CN CN201910443974.XA patent/CN110273697B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2590930A1 (en) * | 1985-11-29 | 1987-06-05 | Douaisis Sabes Stephanoise | MINING SLAUGHTER |
| CN86203486U (en) * | 1986-05-23 | 1987-10-03 | 煤炭工业部煤炭科学研究院重庆研究所 | Simple hydraulic support with slided top beam |
| CN1067706A (en) * | 1992-03-20 | 1993-01-06 | 朱国志 | Hydraulic arch support for soft-rock tunnel |
| CN201190575Y (en) * | 2008-05-26 | 2009-02-04 | 郑州四维机电设备制造有限公司 | Connecting bar type hydraulic support at fully-mechanized mining working faces for thin seam |
| CN102052083A (en) * | 2010-12-09 | 2011-05-11 | 中国矿业大学 | Polygonal hydraulic active support bracket |
| CN201991536U (en) * | 2011-03-22 | 2011-09-28 | 中建市政建设有限公司 | Device for replacing tail brush in shield tunneling process |
| CN206111211U (en) * | 2016-08-27 | 2017-04-19 | 中国建筑第六工程局有限公司 | A regular polygon prestressing force support for preventing circular tunnel deformation of side opening |
| CN206418479U (en) * | 2017-01-06 | 2017-08-18 | 长江水利委员会长江科学院 | One kind has the automatic tie rod system of cable feeler lever |
| CN210152680U (en) * | 2019-05-27 | 2020-03-17 | 山东科技大学 | Prestressing force strutting arrangement who uses when tunnel connection passageway excavates |
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