CN110872950A - Small conduit advanced support method for tunnel construction - Google Patents
Small conduit advanced support method for tunnel construction Download PDFInfo
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- CN110872950A CN110872950A CN201911141428.7A CN201911141428A CN110872950A CN 110872950 A CN110872950 A CN 110872950A CN 201911141428 A CN201911141428 A CN 201911141428A CN 110872950 A CN110872950 A CN 110872950A
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- small
- guide pipe
- grouting
- small guide
- drilling
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000010276 construction Methods 0.000 title claims abstract description 29
- 238000005553 drilling Methods 0.000 claims abstract description 31
- 239000011435 rock Substances 0.000 claims abstract description 31
- 239000011440 grout Substances 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 238000005054 agglomeration Methods 0.000 claims description 3
- 230000002776 aggregation Effects 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000013213 extrapolation Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 238000007596 consolidation process Methods 0.000 abstract description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000243 solution Substances 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to the technical field of tunnel construction support, and discloses a small conduit advanced support method for tunnel construction, which comprises the following steps: s1 material selection and preparation: selecting a length of 3m and
the small guide tube is made of the hot-rolled seamless steel tube, and cylindrical pipes are drilled in a length range of 2.5m of the tube wall, and the distance between the cylindrical pipes is 15 multiplied by 15cm
The head end of the grouting small hole is closed and is polished into a sharp shape with an angle of 30 degrees by a polisher, a non-drilling area with the length of 80cm is reserved at the tail end of the grouting small hole to be used as a grout stopping section, and the tail part of the small guide pipe is provided with a grouting small hole
Description
Technical Field
The invention relates to the technical field of tunnel construction support, in particular to a small conduit advance support method for tunnel construction.
Background
The advanced small guide pipe is a technological method in the tunneling construction process of tunnel engineering, and is mainly used for pre-supporting the soft broken zone, the shallow buried zone, the cave mouth bias zone, the sand layer section, the sand-gravel section, the fault broken zone and other zones with short self-stabilizing time, and the advanced small guide pipe needs to be correspondingly supported in the tunneling construction process, so that the normal tunneling of the tunnel is ensured.
However, in the current tunnel construction process, support is mostly adopted in the form of a bracket, the support effect of the support mode is not ideal enough, and when a bad stratum is encountered, the corresponding support effect is difficult to play, so that the normal construction of the engineering is influenced. Accordingly, those skilled in the art have provided a method for pre-supporting a small duct in tunnel construction to solve the problems of the background art described above.
Disclosure of Invention
The invention aims to provide a small conduit advance support method for tunnel construction, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a small conduit advanced support method for tunnel construction comprises the following steps:
s1 material selection and preparation: selecting a length of 3m and
the small guide tube is made of the hot-rolled seamless steel tube, and cylindrical pipes are drilled in a length range of 2.5m of the tube wall, and the distance between the cylindrical pipes is 15 multiplied by 15cm
The head end of the grouting small hole is closed and is polished into a sharp shape with an angle of 30 degrees by a polisher, a non-drilling area with the length of 80cm is reserved at the tail end of the grouting small hole to be used as a grout stopping section, and the tail part of the small guide pipe is provided with a grouting small hole
Welding a circle of reinforcing hoop on the steel bar;
s2 measurement lofting: the preset position of the small guide pipe is arranged on the corresponding construction section, then a mark is made, and a corresponding control point is set so as to be used for controlling the extrapolation angle and the specific direction of the small guide pipe during drilling;
s3, preparing materials: adding the slurry into a stirring machine with barrel diameter of 500mm, barrel height of 500mm and motor power of 2200W according to a weight ratio of 1:0.4, and stirring for 60min until no agglomeration phenomenon exists in the slurry;
s4 drilling: drilling holes at the position where the small guide pipe is required to be reinforced by using a handheld air drill according to a preset position, blowing out dust and impurities in the holes by using a high-pressure fan, then driving the small guide pipe into the holes, checking whether a filler exists in the small guide pipe, if so, blowing out the filler by using high-pressure air, then plugging the periphery of the small guide pipe by using an anchoring agent, and enabling the small guide pipe to leak 20cm outside for connecting a grouting pipeline;
s5 connecting lines: connecting the slurry outlet end of the slurry injection pump with the small guide pipe through a pipeline, and connecting the slurry inlet end of the slurry injection pump with the stirring machine through a pipeline, wherein the slurry outlet end and the slurry inlet end of the slurry injection pump are both connected with the small guide pipe and the stirring machine through flanges;
s6 grouting: the grouting pump is controlled by an external controller to inject the grout in the stirrer into the small guide pipe, the grout is directly pressed into a rock body by taking the small hole in the small guide pipe as a channel under the pressure action of the grouting pump, and the stirrer is kept to continuously stir the grout in the grouting process.
As a still further scheme of the invention: the grouting pressure in the grouting process is gradually increased from small to large, namely: and (3) grouting by adopting small pressure, closing the exhaust hole after the small hole on the small guide pipe is full, pressurizing to the expected set final pressure, and keeping for more than 10min, wherein the grouting pressure is controlled to be 0.25-0.4 MPa.
As a still further scheme of the invention: in the drilling, should press into the little pipe according to the concrete condition of country rock, promptly: when the surrounding rock is sandy soil, the method should be adopted
Making a blowpipe by using the steel pipe, slowly inserting the blowpipe into soil, perforating by using high-pressure air, and driving a small guide pipe into the blowpipe after pore forming; when the surrounding rock is a rock body, drilling is carried out by adopting a phenomenon drilling device under the condition that the rock body can form a hole, and then the small guide pipe is driven into the hole by utilizing the matching of the drilling device and a traveling hammer; when the surrounding rock is a stratum with mixed earth and stones, construction can be carried out by adopting a mode of simultaneously drilling and pipe jacking.
As a still further scheme of the invention: before grouting, whether the pipelines are blocked and water leakage is detected, whether the management is smooth is detected by a pressure test method, namely, clear water is introduced into each pipeline for operation, and leakage is mended by an adhesive tape under the condition of water leakage.
As a still further scheme of the invention: the installation of the small guide pipe in the drilling process also comprises the following steps: the spacing between adjacent small conduits should also be determined according to the specific circumstances of the surrounding rock, namely: when a single-layer small conduit is adopted, the distance between the small conduits is 40 cm; b: the front and back rows of small ducts are distributed in a staggered way, and the lap joint length of the front and back rows of small ducts is more than or equal to 90 cm.
As a still further scheme of the invention: in the material preparation process, the rotating speed of the barrel body of the stirring machine is 28RPM, and the rotating speed of the motor of the stirring machine is 1380 RPM and 1400 RPM.
Compared with the prior art, the invention has the beneficial effects that: the method adopts a small conduit and consolidation combined advanced support system, improves the stability of the surrounding rock, inhibits the relaxation deformation of the surrounding rock, increases the construction safety, has stable and reliable reinforcement effect, is easy to control the grouting amount, obviously improves the support performance, is also suitable for construction of poor surrounding rock sections such as weak surrounding rock sections, fracture zones, shallow sections and the like, greatly increases the application range, and can be popularized and used in a large area.
Detailed Description
In the embodiment of the invention, a small conduit advanced support method for tunnel construction comprises the following steps:
s1 material selection and preparation: selecting a length of 3m and
the small guide tube is made of the hot-rolled seamless steel tube, and cylindrical pipes are drilled in a length range of 2.5m of the tube wall, and the distance between the cylindrical pipes is 15 multiplied by 15cm
The head end of the grouting small hole is closed and is polished into a sharp shape with an angle of 30 degrees by a polisher, a non-drilling area with the length of 80cm is reserved at the tail end of the grouting small hole to be used as a grout stopping section, and the tail part of the small guide pipe is provided with a grouting small hole
Welding a circle of reinforcing hoop on the steel bar;
s2 measurement lofting: the preset position of the small guide pipe is arranged on the corresponding construction section, then a mark is made, and a corresponding control point is set so as to be used for controlling the extrapolation angle and the specific direction of the small guide pipe during drilling;
s3, preparing materials: adding the slurry into a stirring machine with barrel diameter of 500mm, barrel height of 500mm and motor power of 2200W according to a weight ratio of 1:0.4, and stirring for 60min until no agglomeration phenomenon exists in the slurry;
s4 drilling: drilling holes at the position where the small guide pipe is required to be reinforced by using a handheld air drill according to a preset position, blowing out dust and impurities in the holes by using a high-pressure fan, then driving the small guide pipe into the holes, checking whether a filler exists in the small guide pipe, if so, blowing out the filler by using high-pressure air, then plugging the periphery of the small guide pipe by using an anchoring agent, and enabling the small guide pipe to leak 20cm outside for connecting a grouting pipeline;
s5 connecting lines: connecting the slurry outlet end of the slurry injection pump with the small guide pipe through a pipeline, and connecting the slurry inlet end of the slurry injection pump with the stirring machine through a pipeline, wherein the slurry outlet end and the slurry inlet end of the slurry injection pump are both connected with the small guide pipe and the stirring machine through flanges;
s6 grouting: the grouting pump is controlled by an external controller to inject the grout in the stirrer into the small guide pipe, the grout is directly pressed into a rock body by taking the small hole in the small guide pipe as a channel under the pressure action of the grouting pump, and the stirrer is kept to continuously stir the grout in the grouting process.
Preferably: the grouting pressure in the grouting process is gradually increased from small to large, namely: and (3) grouting by adopting small pressure, closing the exhaust hole after the small hole on the small guide pipe is full, pressurizing to the expected set final pressure, and keeping for more than 10min, wherein the grouting pressure is controlled to be 0.25-0.4 MPa.
Preferably: in the drilling, should drive into little pipe according to the concrete condition of country rock, promptly: when the surrounding rock is sandy soil, the method should be adopted
Making a blowpipe by using the steel pipe, slowly inserting the blowpipe into soil, perforating by using high-pressure air, and driving a small guide pipe into the blowpipe after pore forming; when the surrounding rock is a rock body, drilling is carried out by adopting a phenomenon drilling device under the condition that the rock body can form a hole, and then the small guide pipe is driven into the hole by utilizing the matching of the drilling device and a traveling hammer; when the surrounding rock is a stratum with mixed earth and stones, construction can be carried out by adopting a mode of simultaneously drilling and pipe jacking.
Preferably: before grouting, whether the pipelines are blocked and water leakage is detected, and whether the management is smooth is detected by a pressure test method, namely, clear water is introduced into each pipeline for operation, and leakage is mended by an adhesive tape for the water leakage condition.
Preferably: the installation of small pipe in the drilling process still includes, a: the spacing between adjacent small conduits should also be determined according to the specific circumstances of the surrounding rock, namely: when a single-layer small conduit is adopted, the distance between the small conduits is 40 cm; b: the front and back rows of small ducts are distributed in a staggered way, and the lap joint length of the front and back rows of small ducts is more than or equal to 90 cm.
Preferably: in the material preparation process, the rotating speed of the barrel body of the stirring machine is 28RPM, and the rotating speed of the motor of the stirring machine is 1380 RPM and 1400 RPM.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (6)
1. A small conduit advanced support method for tunnel construction is characterized by comprising the following steps:
s1 material selection and preparation: selecting a length of 3m and
the small guide tube is made of the hot-rolled seamless steel tube, and cylindrical pipes are drilled in a length range of 2.5m of the tube wall, and the distance between the cylindrical pipes is 15 multiplied by 15cm
The head end of the grouting small hole is closed and is polished into a sharp shape with an angle of 30 degrees by a polisher, a non-drilling area with the length of 80cm is reserved at the tail end of the grouting small hole to be used as a grout stopping section, and the tail part of the small guide pipe is provided with a grouting small hole
Welding a circle of reinforcing hoop on the steel bar;
s2 measurement lofting: the preset position of the small guide pipe is arranged on the corresponding construction section, then a mark is made, and a corresponding control point is set so as to be used for controlling the extrapolation angle and the specific direction of the small guide pipe during drilling;
s3, preparing materials: adding the slurry into a stirring machine with barrel diameter of 500mm, barrel height of 500mm and motor power of 2200W according to a weight ratio of 1:0.4, and stirring for 60min until no agglomeration phenomenon exists in the slurry;
s4 drilling: drilling holes at the position where the small guide pipe is required to be reinforced by using a handheld air drill according to a preset position, blowing out dust and impurities in the holes by using a high-pressure fan, then driving the small guide pipe into the holes, checking whether a filler exists in the small guide pipe, if so, blowing out the filler by using high-pressure air, then plugging the periphery of the small guide pipe by using an anchoring agent, and enabling the small guide pipe to leak 20cm outside for connecting a grouting pipeline;
s5 connecting lines: connecting the slurry outlet end of the slurry injection pump with the small guide pipe through a pipeline, and connecting the slurry inlet end of the slurry injection pump with the stirring machine through a pipeline, wherein the slurry outlet end and the slurry inlet end of the slurry injection pump are both connected with the small guide pipe and the stirring machine through flanges;
s6 grouting: the grouting pump is controlled by an external controller to inject the grout in the stirrer into the small guide pipe, the grout is directly pressed into a rock body by taking the small hole in the small guide pipe as a channel under the pressure action of the grouting pump, and the stirrer is kept to continuously stir the grout in the grouting process.
2. The method for the advance support of the small guide pipes in the tunnel construction according to claim 1, wherein the grouting pressure in the grouting is gradually increased from small to large, namely: and (3) grouting by adopting small pressure, closing the exhaust hole after the small hole on the small guide pipe is full, pressurizing to the expected set final pressure, and keeping for more than 10min, wherein the grouting pressure is controlled to be 0.25-0.4 MPa.
3. The method for the advance support of the small guide pipe in the tunnel construction according to claim 1, wherein in the drilling hole, the small guide pipe is driven according to the specific conditions of surrounding rocks, namely: when the surrounding rock is sandy soil, the method should be adopted
Making a blowpipe by using the steel pipe, slowly inserting the blowpipe into soil, perforating by using high-pressure air, and driving a small guide pipe into the blowpipe after pore forming; when the surrounding rock is the rock mass, under the condition that the rock mass can be formed into a hole, the phenomenon drilling equipment is adopted for drilling, and then the small guide pipe is matched with the traveling hammer by utilizing the drilling equipmentDriving in; when the surrounding rock is a stratum with mixed earth and stones, construction can be carried out by adopting a mode of simultaneously drilling and pipe jacking.
4. The method for the small duct advance support in tunnel construction according to claim 1, wherein before grouting, whether the pipelines are blocked and water leakage is detected, and whether the management is smooth is detected by a pressure test method, that is, clear water is introduced into each pipeline for operation, and for the water leakage, the leakage is repaired by an adhesive tape.
5. The method for the advance support of the small guide pipe in the tunnel construction according to claim 1, wherein the installation of the small guide pipe in the drilling process further comprises: the spacing between adjacent small conduits should also be determined according to the specific circumstances of the surrounding rock, namely: when a single-layer small conduit is adopted, the distance between the small conduits is 40 cm; b: the front and back rows of small ducts are distributed in a staggered way, and the lap joint length of the front and back rows of small ducts is more than or equal to 90 cm.
6. The method as claimed in claim 1, wherein the barrel rotation speed of the stirrer in the preparation process is 28RPM, and the motor rotation speed of the stirrer is 1380 RPM and 1400 RPM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911141428.7A CN110872950A (en) | 2019-11-20 | 2019-11-20 | Small conduit advanced support method for tunnel construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911141428.7A CN110872950A (en) | 2019-11-20 | 2019-11-20 | Small conduit advanced support method for tunnel construction |
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| Publication Number | Publication Date |
|---|---|
| CN110872950A true CN110872950A (en) | 2020-03-10 |
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ID=69717150
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911141428.7A Pending CN110872950A (en) | 2019-11-20 | 2019-11-20 | Small conduit advanced support method for tunnel construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847038A (en) * | 2021-09-18 | 2021-12-28 | 中电建铁路建设投资集团有限公司 | Single-row steel pipe advanced grouting reinforcement method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59203200A (en) * | 1983-05-04 | 1984-11-17 | 積水化学工業株式会社 | Method of reinforcing construction of tunnel |
| US20040144003A1 (en) * | 2003-01-24 | 2004-07-29 | Ferrari De Nobili S.R.L. | Continuous method of realisation of works underground, tunnels and excavations in general with works of consolidation, permeabilisation and drainage obtained through guided perforations |
| CN101196116A (en) * | 2007-12-28 | 2008-06-11 | 中铁十二局集团有限公司 | Three-connected-arch tunnel double-side cavity construction method for soft geological |
| CN107060779A (en) * | 2017-04-19 | 2017-08-18 | 中建八局第三建设有限公司 | A kind of anti-cut construction method of narrow regions ultra-deep passage inclined shaft |
| CN109630158A (en) * | 2018-12-10 | 2019-04-16 | 中交公局桥隧工程有限公司 | Construction process of advanced small guide pipe |
-
2019
- 2019-11-20 CN CN201911141428.7A patent/CN110872950A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59203200A (en) * | 1983-05-04 | 1984-11-17 | 積水化学工業株式会社 | Method of reinforcing construction of tunnel |
| US20040144003A1 (en) * | 2003-01-24 | 2004-07-29 | Ferrari De Nobili S.R.L. | Continuous method of realisation of works underground, tunnels and excavations in general with works of consolidation, permeabilisation and drainage obtained through guided perforations |
| CN101196116A (en) * | 2007-12-28 | 2008-06-11 | 中铁十二局集团有限公司 | Three-connected-arch tunnel double-side cavity construction method for soft geological |
| CN107060779A (en) * | 2017-04-19 | 2017-08-18 | 中建八局第三建设有限公司 | A kind of anti-cut construction method of narrow regions ultra-deep passage inclined shaft |
| CN109630158A (en) * | 2018-12-10 | 2019-04-16 | 中交公局桥隧工程有限公司 | Construction process of advanced small guide pipe |
Non-Patent Citations (1)
| Title |
|---|
| 吕先明: "浅谈小导管注浆技术在隧道工程中的应用", 《科技视界》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847038A (en) * | 2021-09-18 | 2021-12-28 | 中电建铁路建设投资集团有限公司 | Single-row steel pipe advanced grouting reinforcement method |
| CN113847038B (en) * | 2021-09-18 | 2024-04-02 | 中电建铁路建设投资集团有限公司 | Single-row steel pipe advanced grouting reinforcement method |
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