CN111828049B - Shallow-buried underground excavation tunnel advanced small guide pipe construction method - Google Patents
Shallow-buried underground excavation tunnel advanced small guide pipe construction method Download PDFInfo
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- CN111828049B CN111828049B CN202010736298.8A CN202010736298A CN111828049B CN 111828049 B CN111828049 B CN 111828049B CN 202010736298 A CN202010736298 A CN 202010736298A CN 111828049 B CN111828049 B CN 111828049B
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- 238000010276 construction Methods 0.000 title claims abstract description 19
- 238000009412 basement excavation Methods 0.000 title claims abstract description 16
- 239000003550 marker Substances 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000003466 welding Methods 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims description 28
- 238000013461 design Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000004080 punching Methods 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 7
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 244000025254 Cannabis sativa Species 0.000 description 3
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 3
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 3
- 235000009120 camo Nutrition 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 235000005607 chanvre indien Nutrition 0.000 description 3
- 239000011487 hemp Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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Classifications
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- 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
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- 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)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to a construction method of a shallow-buried underground excavation tunnel advanced small guide pipe, which comprises the following steps: firstly, punching a through hole on an I-shaped steel web plate, wherein the distance from the bottom of the through hole to the lower surface of the I-shaped steel is N; secondly, the drill rod penetrates through the through hole; thirdly, a marker post is taken and is tightly attached to the lower surface of the I-shaped steel, first and second marking points with the front-back distance of L are arranged on the marker post, the first marking points and the rear side surface of the web plate of the I-shaped steel are coplanar, the inclination angle of the advanced small guide pipe is defined to be delta, the theoretical vertical distance between the marker post at the second marking point and the drill rod is M, and the relation between L, M, N and delta is as follows: obtaining the allowable value range of M from M1 to M2 according to the value range of delta; measuring whether the actual vertical distance between the marker post and the drill rod at the second marking point is within the range of M1-M2, and if not, adjusting the inclination angle of the drill rod; and fifthly, inserting the small advanced guide pipe into the jack and welding the small advanced guide pipe with the I-shaped steel. The method is used for solving the problem that the angle of the lead small conduit does not meet the requirement after installation.
Description
Technical Field
The invention relates to a construction method of a shallow-buried underground excavation tunnel advanced small guide pipe.
Background
The shallow-buried underground excavation method is a method for carrying out various types of underground tunnel underground excavation construction in the underground close to the earth surface, in the construction process of the shallow-buried underground excavation method, I-shaped steel supports are gradually installed when earth is excavated forwards, extend along the circumferential direction of a tunnel and support the inner wall of the tunnel, and are arranged at intervals along the extending direction of the tunnel; before tunnel earthwork excavation, a small advancing guide pipe extending obliquely upwards needs to be pre-buried above a tunnel to prevent the earthwork above the tunnel from collapsing, the small advancing guide pipe is provided with a plurality of units, each unit is arranged at intervals along the length direction of the tunnel, each unit comprises a plurality of small advancing guide pipes, the small advancing guide pipes in each unit are arranged along the circumferential direction of the tunnel, the small advancing guide pipes need to incline obliquely by 5-10 degrees when being installed, when the small advancing guide pipes are installed, through holes for the small advancing guide pipes to pass through are arranged on a web plate of an I-shaped steel closest to a tunnel face, then a rock drill penetrates through the through holes and extends to the tunnel face to start drilling insertion holes for the small advancing guide pipes to extend into, the axes of the insertion holes incline obliquely by 5-10 degrees, after the insertion holes are drilled, the small advancing guide pipes are inserted into the insertion holes, after the small advancing guide pipes are inserted in place, the rear parts of the small advancing guide pipes are still inserted into the insertion holes on the I-shaped steel, and then fixedly connecting the small advanced guide pipe with the I-shaped steel, and finally grouting into the small advanced guide pipe (slurry overflow holes are formed in the pipe wall of the small advanced guide pipe, and slurry can enter the jack through the slurry overflow holes and is fixedly connected with the surrounding earthwork).
When the drilling of jack is established among the prior art, constructor comes direct drilling according to experience generally, and the inclination of the jack of drilling out often appears unsatisfied requirement's the condition, and this inclination that just makes the leading little pipe after finally installing also does not satisfy operation requirement, and then makes tunnel construction have the potential safety hazard.
Disclosure of Invention
The invention aims to provide a construction method of a shallow-buried underground excavation tunnel advanced small guide pipe, which is used for solving the problem that potential safety hazards exist in tunnel construction due to the fact that the angle of the installed advanced small guide pipe does not meet the requirement in the prior art.
In order to achieve the purpose, the construction method of the advanced small guide pipe of the shallow-buried underground excavation tunnel adopts the following technical scheme:
the method for constructing the advanced small guide pipe of the shallow-buried underground excavation tunnel comprises the following steps:
step one, according to a design drawing, forming a through hole in an I-shaped steel web plate closest to a tunnel face, wherein the distance from the hole bottom of the through hole to the lower surface of the I-shaped steel in the vertical direction is N;
secondly, a drill rod of the drilling equipment penetrates through a through hole in the I-shaped steel web plate and then is propped against the tunnel face, and the drill rod is supported on the hole bottom of the through hole and extends upwards in an inclined mode;
step three, taking a mark post, tightly attaching the mark post to the lower surface of the I-steel, extending the mark post in the front-back direction after tightly attaching, arranging a first mark point and a second mark point on the mark post, wherein the first mark point is positioned between the second mark point and the tunnel face, the distance between the first mark point and the second mark point in the front-back direction is L, the first mark point is positioned in the plane where the side face of the web of the I-steel, which is back to the tunnel face, defines the inclination angle of the advanced ductule after installation as delta, defines the theoretical vertical distance between the mark post and the drill rod at the second mark point as M, and then L, M, N and delta are in relation: the allowable value range of M is M1-M2 which can be calculated according to the value range of delta;
measuring the actual vertical distance between the marker post and the drill rod at the second marking point by using a measuring ruler in the working process of the drilling equipment, judging whether the actual vertical distance between the marker post and the drill rod at the second marking point is within the range of M1-M2, if not within the range of M1-M2, adjusting the inclination angle of the drill rod in the drilling equipment so that the actual vertical distance between the marker post and the drill rod at the second marking point is within the range of M1-M2, and repeating the operation until the drilling work of the jack meeting the requirements is completed;
and step five, after the drilling of the drilling equipment is completed, inserting the advanced small guide pipe into the jack, and welding and fixing the rear part of the advanced small guide pipe on the I-shaped steel.
The construction method of the advanced small guide pipe of the shallow-buried underground excavation tunnel provided by the invention has the beneficial effects that: by using the method, the allowable value range M1-M2 of the M can be obtained through calculation according to the allowable range of the inclination angle of the advanced small guide pipe, then whether the actual vertical distance between the marker post and the drill rod at the second marking point is within the range of M1-M2 is monitored in real time in the drilling process of the drilling equipment, if yes, the requirement is met, if not, the requirement is not met, the inclination angle of the drill rod needs to be adjusted in time, and therefore the finally drilled jack meets the requirement, therefore, the inclination angle of the advanced small guide pipe finally inserted into the jack can meet the requirement, and the probability of safety accidents in the subsequent tunnel construction process can be greatly reduced.
Further, before the advanced small guide pipe is welded, whether the inclination angle of the advanced small guide pipe meets the requirement is checked according to the method for confirming whether the inclination angle of the drill rod meets the requirement. Because the hole diameter of the jack drilled by the drilling equipment is larger than the outer diameter of the advanced small guide pipe, and the hole collapse condition is occasionally met, after the advanced small guide pipe is inserted, whether the inclination angle of the advanced small guide pipe meets the requirement or not is checked, and the checking method is consistent with the mode for determining whether the inclination angle of the drill rod meets the requirement or not.
Furthermore, the length of the mark rod is L, the end face of the mark rod close to the tunnel face forms a first mark point, and the end face of the mark rod back to the tunnel face forms a second mark point. Set up like this, when measuring the M value through the dipperstick, only need with the dipperstick paste tightly on the terminal surface of sighting rod dorsad face and make the upper end of dipperstick push up on the drilling rod can for it is comparatively convenient to measure.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of monitoring whether the inclination angle of a drill rod meets the requirement in an embodiment of the shallow-buried underground excavation tunnel advanced small guide pipe construction method provided by the invention;
fig. 2 is a schematic view for checking whether the inclination angle of the advanced small pipe after installation meets the requirement in the embodiment of the construction method for the advanced small pipe of the shallow-buried underground tunnel provided by the invention.
In the drawings: 1-I-steel, 2-perforation, 3-drill rod, 4-mark rod, 5-measuring scale and 6-advanced small conduit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The following further describes the embodiments of the present invention with reference to fig. 1 and 2.
The embodiment of the construction method of the advanced small guide pipe of the shallow-buried underground tunnel provided by the invention comprises the following steps:
the tunnel in this embodiment is defined to extend in the front-rear direction and to be excavated from the rear to the front when the tunnel is excavated.
The construction method of the shallow-buried underground excavation tunnel advanced small guide pipe comprises the following steps:
step one, according to a design drawing, a through hole 2 is formed in a web plate of an I-shaped steel 1 closest to a tunnel face, the diameter of the through hole 2 is larger than the radial maximum size of a drill bit on a drill rod 3 in drilling equipment, and the vertical distance from the hole bottom of the through hole 2 to the lower surface of the I-shaped steel 1 is N.
And step two, an operator enables a drill rod 3 of the drilling equipment to penetrate through the through hole 2 in the I-shaped steel 1 and prop against the tunnel face, the drill rod 3 is supported at the bottom of the through hole 2 after penetrating through the through hole 2, and the drill rod 3 obliquely extends from back to front and from bottom to top.
And step three, another operator takes a mark post 4, the mark post 4 is a square long rod, the length of the mark post 4 is L, the mark post 4 is tightly attached to the lower surface of the I-shaped steel 1, the length of the mark post 4 extends in the front-back direction, and after the mark post 4 is tightly attached, the front end surface of the mark post is coplanar with the back side surface of the web plate of the I-shaped steel 1. When the inclination angle of the small advancing pipe 6 from back to front and from bottom to top is defined as δ, the drill rod 3 should be kept to drill the jack forward at the inclination angle δ theoretically, and when the drill rod 3 drills forward at the inclination angle δ, the theoretical vertical distance from the upper edge of the rear end surface of the marker post 4 to the drill rod 3 is defined as M, the relation between L, M, N and δ is: and in the actual construction process, the value range of delta is 5-10 degrees, and according to the value range of delta, the allowable value range of M can be calculated to be M1-M2, namely, if the actual vertical distance between the upper edge of the rear end surface of the marker post 4 and the drill rod 3 is in the range of M1-M2 in the drilling process of the drilling equipment, the inserting hole drilled by the drilling equipment is satisfied.
Step four, an operator holding the marker post 4 takes a measuring ruler 5, the measuring ruler 5 is used for measuring the actual vertical distance from the upper edge of the rear end face of the marker post 4 to the drill rod 3, during measurement, the measuring ruler 5 is tightly attached to the rear end face of the marker post 4, the upper end of the measuring ruler 5 is abutted against the drill rod 3, the upper end face of the measuring ruler 5 is taken as a scale starting point, the actual vertical distance from the upper edge of the rear end face of the marker post 4 to the drill rod 3 can be easily read, if the measured actual vertical distance is within the range of M1-M2, the inclination angle of the jack drilled by the drill rod 3 meets the requirement, if the measured actual vertical distance is greater than M2, the inclination angle of the jack drilled by the vertical drill rod 3 is indicated, the front end of the drill rod 3 should be swung upwards until the measured actual vertical distance is within the range of M1-M2, and if the measured actual distance is less than M1, the drill pipe 3 is drilled with a too large angle of inclination and the front end of the drill pipe 3 should be swung down until the actual measured vertical distance is in the range of M1-M2. In the whole process of drilling by the drilling equipment, the measurement ruler 5 is required to be reused to detect whether the actual vertical distance from the upper edge of the rear end face of the marker post 4 to the drill rod 3 meets the requirement.
Step five, after the jack is drilled, the drilling equipment is taken out, then the small advanced guide pipe 6 penetrates through the through hole 2 in the I-beam 1 and is inserted into the jack, and after the small advanced guide pipe 6 is inserted into the jack and is inserted in place, the rear part of the small advanced guide pipe is still inserted into the through hole 2 in the I-beam 1; because the aperture of the jack is larger than the outer diameter of the small advanced guide tube 6, the small advanced guide tube 6 can swing in the jack in a small range, in order to prevent the inclination angle of the small advanced guide tube 6 from exceeding the allowable range during final fixing, after the small advanced guide tube 6 is inserted into the jack, the vertical distance M between the upper edge of the rear end surface of the measuring mark post 4 and the small advanced guide tube 6 is measured, if the measured vertical distance is within the range of M1-M2, the inclination angle of the small advanced guide tube 6 meets the requirement, then the small advanced guide tube 6 and the I-shaped steel 1 are welded and fixed, if the measured vertical distance is larger than M2, the inclination angle of the small advanced guide tube 6 is too small, the front end of the small advanced guide tube 6 should swing upwards until the measured vertical distance is within the range of M1-M2, then the small advanced guide tube 6 and the I-shaped steel 1 are welded and fixed, if the measured vertical distance is smaller than M1, the inclination angle of the leading small guide pipe 6 is too large, the front end of the leading small guide pipe 6 is swung downwards until the measured vertical distance is within the range of M1-M2, and then the leading small guide pipe 6 is welded and fixed with the I-shaped steel 1.
In the embodiment, the advanced small catheter 6 is provided with slurry overflow holes from a position away from the rear end by a set distance forward, the slurry overflow holes are arranged at intervals along the catheter wall and in a quincunx shape, the position away from the rear end by the set distance on the advanced small catheter 6 is defined as an initial position, a pipe section which is positioned at the rear side of the initial position and is close to the initial position is wrapped by a cement hemp rib, the wrapped cement hemp rib is in a wedge shape, the tip of the wedge shape is forward, and when the advanced small catheter 6 is inserted into the jack, the cement hemp rib wrapped on the advanced small catheter 6 can block a cavity between the advanced small catheter 6 and the wall of the jack; after the advanced small pipe 6 is inserted in place and welded and fixed with the I-steel 1, grouting is conducted into the advanced small pipe 6 through grouting equipment, and slurry can enter a cavity between the advanced small pipe 6 and the wall of the jack hole through a slurry overflow hole in the advanced small pipe 6, so that consolidation of the advanced small pipe 6 and surrounding earthwork is achieved.
In the above embodiment, the length of the marker post is L, the front end surface of the marker post forms the first marker point, and the rear end surface of the marker post forms the second marker point. In other embodiments, the length of the marker post may also be greater than L, the first marker point and the second marker point may be any marker points in the length direction of the marker post, and it is only necessary to ensure that the distance between the first marker point and the second marker point in the front-back direction is equal to L.
In the above embodiment, after the advanced small catheter is inserted into the insertion hole, in order to prevent the inclination angle of the advanced small catheter from not meeting the requirement, the inclination angle of the advanced small catheter is checked again by the marker post and the measuring ruler. In other embodiments, the small advanced guide pipe can be directly welded and fixed with the I-shaped steel after being inserted into the jack without checking, and the small advanced guide pipe can also be used.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (3)
1. A shallow buried underground excavation tunnel advanced small guide pipe construction method defines that a tunnel extends along the front-back direction, and is characterized by comprising the following steps:
step one, according to a design drawing, forming a through hole in an I-shaped steel web plate closest to a tunnel face, wherein the distance from the hole bottom of the through hole to the lower surface of the I-shaped steel in the vertical direction is N;
secondly, a drill rod of the drilling equipment penetrates through a through hole in the I-shaped steel web plate and then is propped against the tunnel face, and the drill rod is supported on the hole bottom of the through hole and extends upwards in an inclined mode;
step three, taking a mark post, tightly attaching the mark post to the lower surface of the I-steel, extending the mark post along the front-back direction after tightly attaching, arranging a first mark point and a second mark point on the mark post, wherein the first mark point is positioned between the second mark point and the tunnel face, the distance between the first mark point and the second mark point in the front-back direction is L, the first mark point is positioned in the plane where the side of the web of the I-steel, which is back to the tunnel face, defines the inclination angle from back to front and from bottom to top after the leading small catheter is installed as delta, and defines the theoretical vertical distance between the mark post and the drill rod at the second mark point as M, and the relation between L, M, N and delta is that: m = N-L × tan delta, and the allowable value range of M is M1-M2 according to the value range of delta;
measuring the actual vertical distance between the marker post and the drill rod at the second marking point by using a measuring ruler in the working process of the drilling equipment, judging whether the actual vertical distance between the marker post and the drill rod at the second marking point is within the range of M1-M2, if not within the range of M1-M2, adjusting the inclination angle of the drill rod in the drilling equipment so that the actual vertical distance between the marker post and the drill rod at the second marking point is within the range of M1-M2, and repeating the operation until the drilling work of the jack meeting the requirements is completed;
and step five, after the drilling of the drilling equipment is completed, inserting the advanced small guide pipe into the jack, and welding and fixing the rear part of the advanced small guide pipe on the I-shaped steel.
2. The method as claimed in claim 1, wherein before the welding of the advanced small guide pipe, the inclination angle of the advanced small guide pipe is checked according to the method for confirming whether the inclination angle of the drill rod meets the requirement.
3. The construction method of the small advancing guide pipe of the shallow underground excavation tunnel as claimed in claim 1 or 2, wherein the length of the marker post is L, the end surface of the marker post close to the tunnel face forms a first marker point, and the end surface of the marker post opposite to the tunnel face forms a second marker point.
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| CN202010736298.8A CN111828049B (en) | 2020-07-28 | 2020-07-28 | Shallow-buried underground excavation tunnel advanced small guide pipe construction method |
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| CN202010736298.8A CN111828049B (en) | 2020-07-28 | 2020-07-28 | Shallow-buried underground excavation tunnel advanced small guide pipe construction method |
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| CN111828049B true CN111828049B (en) | 2022-04-15 |
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| CN112796764A (en) * | 2020-12-30 | 2021-05-14 | 龚伦 | Peripheral hole arc drilling construction method for controlling tunnel overexcavation |
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| CN106761494A (en) * | 2017-03-14 | 2017-05-31 | 中铁十七局集团有限公司 | A kind of guider and method for tunnel pre-grouting armature boring |
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| CN207583398U (en) * | 2017-12-20 | 2018-07-06 | 中国水利水电第七工程局有限公司 | A kind of weak surrounding rock combination supporting device |
| CN208594950U (en) * | 2018-06-29 | 2019-03-12 | 中铁十局集团西北工程有限公司 | A kind of advanced tubule positioning fixture |
| CN110318762A (en) * | 2019-07-25 | 2019-10-11 | 中冶建工集团有限公司 | Advanced support method in hole at shallow buried covered excavation unsymmetrial loading tunnel roof fall |
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2020
- 2020-07-28 CN CN202010736298.8A patent/CN111828049B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204788167U (en) * | 2015-07-31 | 2015-11-18 | 孙学颖 | Assistant measuring device |
| CN106761494A (en) * | 2017-03-14 | 2017-05-31 | 中铁十七局集团有限公司 | A kind of guider and method for tunnel pre-grouting armature boring |
| CN207556437U (en) * | 2017-12-13 | 2018-06-29 | 四川银钢一通凸轮轴有限公司 | A kind of camshaft signal disk angle detection mechanism |
| CN207583398U (en) * | 2017-12-20 | 2018-07-06 | 中国水利水电第七工程局有限公司 | A kind of weak surrounding rock combination supporting device |
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