CN115653499A - Non-excavation horizontal directional drilling construction method for drainage pipeline at bottom of tunnel inverted arch - Google Patents
Non-excavation horizontal directional drilling construction method for drainage pipeline at bottom of tunnel inverted arch Download PDFInfo
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- CN115653499A CN115653499A CN202211389655.3A CN202211389655A CN115653499A CN 115653499 A CN115653499 A CN 115653499A CN 202211389655 A CN202211389655 A CN 202211389655A CN 115653499 A CN115653499 A CN 115653499A
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Abstract
The invention relates to a non-excavation horizontal directional drilling construction method for a drainage pipeline at the bottom of an inverted arch of a tunnel. The tunnel inverted arch can cause diseases due to underground water gathering and unsmooth drainage, and the arrangement of a reasonable drainage pipeline is very important. The method comprises the following steps: and horizontally drilling below the existing tunnel inverted arch by utilizing a non-excavation construction process of a horizontal directional drill, and laying a drainage pipeline with a drainage hole in the drilling hole. The invention adopts a non-excavation construction method to construct the drainage pipeline, avoids large-area excavation of the road surface of the constructed tunnel or the bottom of the inverted arch of the newly-built tunnel, has the advantages of no traffic closure, less waste slag, small influence on the safety and the environmental pollution of the tunnel structure, low construction safety risk and the like, saves the cost, realizes cost reduction and efficiency improvement, and provides a new idea for solving the problems of water seepage and drainage of the tunnel.
Description
Technical Field
The invention relates to the technical field of tunnel and underground engineering construction, in particular to a non-excavation horizontal directional drilling construction method for a drainage pipeline at the bottom of an inverted arch of a tunnel.
Background
The inverted arch of the tunnel can cause diseases due to underground water gathering and unsmooth drainage, and the safety of the whole structure of the tunnel is affected. For expansive mudstone tunnels, loess tunnels and tunnels with water in cold and severe cold areas, the bottom of the inverted arch is deformed under the action of underground water and the actions of rock-soil expansive force, water collapsibility and frost heaving force, and diseases such as deformation, cracking, pavement deformation and the like easily occur, so that the road surface of the tunnel is uneven, and the safe operation of the tunnel is influenced. In such tunnels, it is therefore of vital importance to have a reasonable drainage duct at the bottom of the inverted arch.
If the tunnel in operation is damaged, the bottom of the tunnel pavement or the inverted arch of the tunnel needs to be excavated when the drainage pipeline is laid, the traffic needs to be sealed, the engineering quantity is large, the construction period is long, and the construction cost is higher.
Disclosure of Invention
The invention aims to provide a non-excavation horizontal directional drilling construction method for a drainage pipeline at the bottom of an inverted arch of a tunnel, which solves the problems of underground water drainage at the bottom of the inverted arch of the tunnel and elimination of adverse effects of the underground water on the inverted arch of the tunnel and the road surface on the premise of not excavating the existing road surface and the inverted arch of the tunnel.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the trenchless horizontal directional drilling construction method of the drainage pipeline at the bottom of the inverted arch of the tunnel comprises the following steps:
and horizontally drilling below the existing tunnel inverted arch by utilizing a non-excavation construction process of a horizontal directional drill, and laying a drainage pipeline with a drainage hole in the drilled hole.
Further, the method comprises:
vertically excavating a drilling pit at the starting point of the tunnel, vertically excavating a lower pipe pit at the terminal point of the tunnel, wherein the bottom depths of the drilling pit and the lower pipe pit are the laying depths of two ends of a drainage pipeline;
a drilling machine is in place at the starting point of the tunnel, a drilling tool is installed, a drilling rod is drilled from a drilling pit, and a guide hole is horizontally drilled below the tunnel invert;
drilling a guide hole to the lower pipe pit, and carrying out grading reaming to form a drill hole;
and (4) putting a drainage pipeline into the lower pipe pit, utilizing the drill rod to carry out back dragging of the pipeline, laying the drainage pipeline in the drill hole, and connecting the drainage pipeline into the ditch outside the hole at the position where the drainage pipeline enters the drill pit.
And further, drilling a guide hole to the lower pipe pit, and performing hole washing operation in the process of drilling holes by stage reaming.
Further, before digging into the drilling pit and the pipe descending pit, the method also comprises the following steps:
and discharging the position of the through plane according to the through axis of the drainage pipeline below the tunnel inverted arch, marking, and measuring the discharging operation field.
Further, after the drilling machine is in place, the method also comprises the following steps:
and (5) anchoring and fixing the drilling machine by using a ground anchor, wherein the center line of the drilling machine is superposed with the crossing axis.
Further, the step reaming comprises the following steps:
selecting a proper back-reaming bit and the amount of feed per time, and performing back reaming once or for multiple times until the preset aperture or the reaming time is 1.2-1.5 times;
and when the hole expansion reaches the preset aperture, connecting the pipe laying, and dragging the pipe while back expanding until the end.
Further, the method is carried out in a sectional construction mode, and the sectional construction comprises the following steps:
dividing the path of the bore into a plurality of segments, dividing the drainage pipeline into a plurality of segment pipes;
arranging vertical pits at the sections of each section of the path to serve as section lower pipe pits;
sequentially putting the segmental pipeline in front of the segmental lower pipe pit from the tunnel end point to the tunnel starting point, back dragging and sequentially connecting the segmental pipeline to form a complete drainage pipeline;
and after the construction is finished, taking the segmented pipe descending pit as an inspection well of a drainage pipeline.
Compared with the prior art, the invention has the following beneficial effects:
the method can effectively discharge the underground water at the bottom of the tunnel invert, effectively eliminate the adverse effect of the underground water on the tunnel invert and the road surface, and ensure the safety of the tunnel road surface and the lining structure. The method has important significance for preventing the tunnel in the design stage and treating the tunnel invert which is built into the tunnel by groundwater diseases.
More importantly, the construction method is different from the mode that the traditional cast-in-place or prefabricated drainage pipeline is adopted in the design stage, and drainage measures are arranged after tunnel pavement, inverted arches and even inverted arch linings are excavated from the built tunnel, the drainage pipeline is constructed by using a horizontal directional drill and a non-excavation construction method, so that the large-area excavation of the tunnel pavement or the inverted arch bottom of the newly-built tunnel is avoided, and the construction method has the advantages of no traffic closure, less waste slag, small influence on the safety and environmental pollution of the tunnel structure, low construction safety risk and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings of the embodiments can be obtained according to the drawings without creative efforts.
FIG. 1 is a cross-sectional layout view of a drainage pipeline for horizontal directional drilling (without primary support).
FIG. 2 is a cross-sectional layout view of a drainage pipeline for horizontal directional drilling (with primary support).
FIG. 3 is a longitudinal section layout of a drainage pipeline for horizontal directional drilling.
FIG. 4 is a cross-sectional view of the drain pipe.
FIG. 5 is a schematic view of the construction process.
FIG. 6 is a flow chart of the construction process.
The labels in the figure are:
1-drainage pipeline, 2-tunnel inverted arch, 3-tunnel pavement structure, 4-drilling, 5-drainage hole, 6-tunnel design longitudinal slope, 7-primary support, 8-drilling machine, 9-drilling pit, 10-extra-tunnel ditch, 11-tunnel, 12-mountain, 13-pipe pit, 14-tunnel starting point and 15-tunnel terminal point.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the description of this patent, it is to be understood that the terms "front," "back," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the figures, which are based on the orientations and positional relationships shown in the figures, and are used for convenience in describing the patent and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "coupled" and "disposed" and the like are to be construed broadly and may include, for example, a fixed connection, an arrangement, a removable connection, an arrangement, or an integral connection, arrangement. The specific meaning of the above terms in this patent may be understood by one of ordinary skill in the art as appropriate.
In the description of the embodiment, the longitudinal direction of the tunnel is defined as the longitudinal direction, and the longitudinal direction from the starting point of the tunnel to the end point of the tunnel is defined as the front-to-back direction.
Referring to fig. 6, the present embodiment provides a trenchless horizontal directional drilling construction method for drainage pipes at the bottom of an inverted arch of a tunnel, which is different from the conventional cast-in-place or prefabricated drainage pipes, and the drainage measures are provided after the tunnel pavement and the inverted arch or even the inverted arch lining are excavated, and the method of the present invention can lay the drainage pipes under the existing tunnel without excavating the tunnel pavement and the inverted arch. The underground water at the bottom of the tunnel inverted arch can be led out by the laid drainage pipeline, so that the occurrence of diseases is prevented. Referring to fig. 5, the method uses a non-excavation construction process of a horizontal directional drill to horizontally drill a hole under an existing tunnel invert 2, and lays a drainage pipe 1 having a drainage hole 5 in a drilled hole 4. As shown in fig. 1 and 2, the method is applicable to existing tunnels with and without primary supports 7.
The method specifically comprises the following steps:
s1: and (3) measurement and paying-off:
and (4) according to the through axis of the drainage pipeline 1 below the tunnel invert 2, releasing the through plane position by using an RTK or total station, marking and measuring the releasing operation field.
S2: site arrangement:
according to the limited space of the field, the arrangement positions of the drilling machine 8, the drill rod, the slurry stirring and recycling system and other equipment are planned in advance.
S3: the equipment is connected in place:
and equipment and materials such as a mud pump, a mud tank, a mud stirring and recovery system, a drill rod and the like are reasonably distributed according to the plan.
S4: excavating a drilling pit 9 and a lower pipe pit 13:
and vertically developing a drilling pit in front of a tunnel starting point 14 and behind a tunnel terminal point 15 respectively, wherein the drilling pit at the tunnel starting point 14 is a drilling pit 9, the drilling pit at the tunnel terminal point 15 is a lower pipe pit 13, and the bottom depths of the drilling pit 9 and the lower pipe pit 13 are the laying depths of two ends of the drainage pipeline 1.
S5: trial drill
And (3) positioning the drilling machine 8 at the tunnel starting point 14 by using a total station, and anchoring and fixing the drilling machine 8 by using an earth anchor to ensure that the central line of the drilling machine 8 is coincident with the crossing axis.
And (5) installing a drilling tool, drilling a drilling rod from the drilling pit 9, and horizontally drilling a guide hole below the tunnel inverted arch 2. Before that, trial drilling is carried out, corresponding slurry is configured according to geological conditions, 1-3 drill rods are drilled, and whether each connecting part is firm or not is checked.
S6: drilling a guide hole:
and drilling a guide hole to the lower pipe pit 13.
S7: reaming:
the step of reaming forms a borehole 4, the step of reaming comprising the steps of:
selecting a proper back-expanding drill bit and the amount of feed each time according to the diameters and the types of the drainage pipelines and the difference of soil layers and underground water levels, and performing back expansion once or for multiple times until the preset aperture or the hole expansion is 1.2-1.5 times;
and when the hole expansion reaches the preset aperture, connecting the pipe laying, and dragging the pipe while back expanding until the end.
S8: hole washing:
and in the guide hole drilling and reaming construction process, whether hole washing measures are taken or not is determined according to the drilling pressure and the rotation pressure. When the hole is washed, the next procedure is not allowed until the pressure is reduced to a safe range. After the guiding and reaming are finished, 1-2 times of hole washing operation is carried out on the whole drilling hole 4 so as to reduce drilling cuttings in the hole.
S9: back dragging of the pipeline:
and (3) putting the drainage pipeline 1 into the lower pipe pit 13, as shown in figure 4, utilizing a drill rod to carry out pipeline back dragging, laying the drainage pipeline 1 in the drilled hole 4, and connecting the drainage pipeline 1 into the ditch 10 outside the hole at the position of the drilled hole 9.
S10: and (4) withdrawing the equipment.
The method is carried out in a sectional construction mode, and the sectional construction distance is determined according to the concrete condition of the tunnel and the performance condition of equipment; when the tunnel is long, the length of the segments is divided by the position of the inspection well of the drainage pipeline. The sectional construction comprises the following steps:
dividing the path of the bore 4 into a plurality of segments, dividing the drainage pipeline 1 into a plurality of segment pipes;
arranging vertical pits at the sections of each section of the path to serve as section pipe laying pits;
sequentially putting the segmental pipeline into a segmental under-pipe pit from the tunnel terminal point 15 to the tunnel starting point 4, pulling back and sequentially connecting the segmental pipelines to form a complete drainage pipeline 1;
and after the construction is finished, taking the sectional pipe laying pit as an inspection well of the drainage pipeline 1.
As shown in figure 3, the longitudinal slope gradient of the drainage pipeline laid by the invention is consistent with the longitudinal slope gradient of the designed tunnel, and the diameter of the drilled hole is generally 1.2-1.5 times of that of the drainage pipeline. The drainage pipeline can adopt a PE pipe or an HDPE pipe, the drainage pipeline interface adopts a hot melting connection mode, and drainage pipelines are provided with drainage holes which are arranged in a staggered quincunx manner. Underground water below the bottom of the tunnel inverted arch extends into the drilled hole and then enters the drainage pipeline through the drain hole, so that the underground water is introduced into the ditch outside the tunnel and is discharged.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (7)
1. The trenchless horizontal directional drilling construction method of the drainage pipeline at the bottom of the inverted arch of the tunnel is characterized by comprising the following steps of:
the method comprises the following steps:
a non-excavation construction process of a horizontal directional drill is utilized, horizontal drilling is carried out below an existing tunnel invert (2), and a drainage pipeline (1) with a drainage hole (5) is laid in a drill hole (4).
2. The trenchless horizontal directional drilling construction method of the drainage pipeline at the bottom of the inverted arch of the tunnel according to claim 1, characterized in that:
the method comprises the following steps:
vertically excavating a drilling pit (9) at a tunnel starting point (14), vertically excavating a pipe laying pit (13) at a tunnel terminal point (15), wherein the bottom depths of the drilling pit (9) and the pipe laying pit (13) are the laying depths of two ends of a drainage pipeline (1);
a drilling machine (8) is in place at the starting point (14) of the tunnel, a drilling tool is installed, a drilling rod is drilled from a drilling pit (9), and a guide hole is horizontally drilled below the tunnel inverted arch (2);
drilling a guide hole to a lower pipe pit (13), and carrying out stepped reaming to form a drill hole (4);
the drainage pipeline (1) is put into the lower pipe pit (13), the drill rod is used for dragging the pipeline back, the drainage pipeline (1) is laid in the drill hole (4), and the drainage pipeline (1) is connected into the ditch (10) outside the hole at the position of entering the drill pit (9).
3. The trenchless horizontal directional drilling construction method of the drainage pipeline at the bottom of the inverted arch of the tunnel according to claim 2, characterized in that:
and (5) drilling a guide hole to the lower pipe pit (13), and performing hole washing operation in the process of reaming in stages to form the drill hole (4).
4. The trenchless horizontal directional drilling construction method of the drainage pipeline at the bottom of the inverted arch of the tunnel as claimed in claim 3, characterized in that:
before digging into the drilling pit (9) and the lower pipe pit (13), the method also comprises the following steps:
and (3) according to the through axis of the drainage pipeline (1) below the tunnel inverted arch (2), discharging the through plane position, marking and measuring the discharging operation field.
5. The trenchless horizontal directional drilling construction method of the drainage pipeline at the bottom of the inverted arch of the tunnel according to claim 4, characterized in that:
after the drilling machine (8) is in place, the method also comprises the following steps:
and (3) anchoring and fixing the drilling machine (8) by using a ground anchor, wherein the center line of the drilling machine (8) is superposed with the crossing axis.
6. The trenchless horizontal directional drilling construction method of the drainage pipeline at the bottom of the inverted arch of the tunnel as claimed in claim 5, characterized in that:
the step reaming comprises the following steps:
selecting a proper back-reaming bit and the amount of feed per time, and performing back reaming once or for multiple times until the preset aperture or the reaming time is 1.2-1.5 times;
and when the hole expansion reaches the preset aperture, connecting the pipe laying, and dragging the pipe while back expanding until the end.
7. The trenchless horizontal directional drilling construction method of the drainage pipeline at the bottom of the inverted arch of the tunnel according to claim 6, characterized in that:
the method is carried out in a sectional construction mode, and the sectional construction comprises the following steps:
dividing the path of the bore (4) into a plurality of segments, dividing the drainage pipeline (1) into a plurality of segment pipes;
arranging vertical pits at the sections of each section of the path to serve as section pipe laying pits;
from the tunnel terminal (15) to the tunnel starting point (4), sequentially putting the segmental pipeline in front of the segmental pipe pit from the segmental pipe pit, pulling back and sequentially connecting the segmental pipeline to form a complete drainage pipeline (1);
and after the construction is finished, taking the sectional pipe laying pit as an inspection well of the drainage pipeline (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211389655.3A CN115653499A (en) | 2022-11-08 | 2022-11-08 | Non-excavation horizontal directional drilling construction method for drainage pipeline at bottom of tunnel inverted arch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211389655.3A CN115653499A (en) | 2022-11-08 | 2022-11-08 | Non-excavation horizontal directional drilling construction method for drainage pipeline at bottom of tunnel inverted arch |
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| CN115653499A true CN115653499A (en) | 2023-01-31 |
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| CN202211389655.3A Pending CN115653499A (en) | 2022-11-08 | 2022-11-08 | Non-excavation horizontal directional drilling construction method for drainage pipeline at bottom of tunnel inverted arch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024099281A1 (en) * | 2022-11-10 | 2024-05-16 | 中交第二公路勘察设计研究院有限公司 | Tunnel drainage method based on laying of drainage pipe using ultra-long-distance horizontal directional drilling |
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- 2022-11-08 CN CN202211389655.3A patent/CN115653499A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024099281A1 (en) * | 2022-11-10 | 2024-05-16 | 中交第二公路勘察设计研究院有限公司 | Tunnel drainage method based on laying of drainage pipe using ultra-long-distance horizontal directional drilling |
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