CN110985120A - Precipitation construction method and system for tunnel connection channel of fractured clay layer - Google Patents
Precipitation construction method and system for tunnel connection channel of fractured clay layer Download PDFInfo
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- CN110985120A CN110985120A CN201911418468.1A CN201911418468A CN110985120A CN 110985120 A CN110985120 A CN 110985120A CN 201911418468 A CN201911418468 A CN 201911418468A CN 110985120 A CN110985120 A CN 110985120A
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- 238000001556 precipitation Methods 0.000 title claims abstract description 94
- 238000010276 construction Methods 0.000 title claims abstract description 70
- 239000004927 clay Substances 0.000 title claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000002689 soil Substances 0.000 claims abstract description 61
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000005086 pumping Methods 0.000 claims abstract description 19
- 238000009412 basement excavation Methods 0.000 claims description 36
- 238000004891 communication Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 17
- 230000008595 infiltration Effects 0.000 abstract description 8
- 238000001764 infiltration Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 description 13
- 238000001914 filtration Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 239000012466 permeate Substances 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
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- Geochemistry & Mineralogy (AREA)
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- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to a precipitation construction method and a precipitation construction system for a tunnel connecting channel of a fractured clay layer. The negative pressure that forms in the downcomer among the pumping process can produce suction, pumps the intraformational water of soil around the downcomer, for the intraformational water of soil around the downcomer provides the drive power to the infiltration in the downcomer, and then promotes upper layer stagnant water and oozes to the downcomer through fissile clay layer, realizes the precipitation to fissile clay layer upper layer stagnant water.
Description
Technical Field
The invention relates to a precipitation construction method and system for a tunnel connection channel of a fractured clay layer.
Background
With the increasing requirements on the construction capacity of the infrastructure, the construction method and the system of the infrastructure are also continuously improved and developed. Tunnel construction is one of the basic construction techniques, and is common in construction of highways, railways, and the like. Tunnel construction generally need still need establish the contact passageway between two-way tunnels except that need excavate two-way tunnel, however to different geological conditions, the construction degree of difficulty of contact passageway is different. For the situation that the construction position of the communication channel has water stagnation on the upper layer, before the communication channel is excavated, precipitation is often needed.
At present, there is also a related technology related to precipitation construction of an interconnection channel, for example, application publication No. CN102400713A, entitled precipitation method disclosed in a method for precipitation auxiliary construction in an interconnection channel tunnel, the precipitation method is suitable for a soil layer with large permeability or a soil layer without cohesive soil, water outlet holes are located at four corners of the interconnection channel, a water outlet pipe has a certain inclination angle towards the inside of the tunnel, water in the soil layer can permeate into the water outlet pipe by virtue of gravity and flows into the tunnel along the water outlet pipe, and then the accumulated water in the tunnel is discharged by a water pump. However, for the connection channel constructed in the cracked clay layer with the upper layer of stagnant water, the penetration coefficient of the cohesive soil is small, and the connection channel has a good water-proof effect, so that the upper layer of stagnant water cannot automatically permeate into the water outlet pipe through gravity, and the precipitation method disclosed by the prior art document is not suitable for precipitation construction of the tunnel connection channel of the cracked clay layer.
And for the fractured clay layer, due to the characteristics of the soil layer, the soil layer is disturbed in the excavation process, and then the fractures of the clay are disturbed, so that the stagnant water on the upper layer can quickly permeate to the excavation surface through the fractures, the clay and the water on the construction surface are mixed together to form slurry, and great trouble and difficulty are brought to construction. Therefore, at present, a good precipitation mode is not provided for the construction of the tunnel connection channel of the fractured clay layer.
Disclosure of Invention
The invention aims to provide a precipitation construction method for a tunnel connection channel of a fractured clay layer, which can safely and conveniently carry out precipitation construction on the tunnel connection channel of the fractured clay layer; meanwhile, the invention also aims to provide a precipitation construction system for the tunnel connection channel of the fractured clay layer.
The tunnel connection channel precipitation construction method of the fractured clay layer adopts the following technical scheme:
a tunnel connection channel dewatering construction method for a fractured clay layer comprises the steps of pumping a dewatering pipe into a soil layer around an excavated area of a connection channel, and pumping water outwards through the dewatering pipe.
The beneficial effects are that: the negative pressure that forms in the downcomer in-process draws water can produce suction, pumps the intraformational water of soil around the downcomer, for the intraformational water of soil around the downcomer provides the drive power to the infiltration in the downcomer, under the prerequisite of not destroying the clay layer, overcomes the separation of clay layer to the stagnant water of going up, and then promotes the stagnant water of upper strata and oozes to the in the downcomer through fissile clay layer, realizes the precipitation to the stagnant water of fissile clay layer upper strata.
Furthermore, dewatering pipes are driven into the two sides of the connection channel excavation area and the bottom soil layer, and the plurality of dewatering pipes surround the connection channel excavation area in a U shape.
The beneficial effects are that: many downcomer are the U type and carry out half encirclement to the contact passageway excavation district, can carry out even, thorough suction to the water in the soil layer around the contact passageway excavation district, avoid local existence not influenced the excavation of later stage contact passageway by the water of suction.
Furthermore, the distance between two adjacent downcomer pipes is 1.5m-2.0 m.
The beneficial effects are that: the downcomer that suitable interval was arranged can carry out effective suction to the water around the corresponding position department of portal, avoids setting up too much downcomer and causes too big destruction to the integrality on clay layer and having tunnel segment to and construction cost's increase.
Furthermore, the outer ends of the downcomer pipes are converged on the main water pumping pipeline through pipelines, and water is pumped through the vacuum pumps connected in series on the main water pumping pipeline.
The beneficial effects are that: the vacuum pump on through total drinking-water pipeline pumps each downcomer simultaneously, improves the work efficiency of pump, in addition, need not to set up the pump alone to each downcomer, avoids increasing construction cost, avoids the single tube water yield to lead to the pump to damage for a short time simultaneously.
Furthermore, before pumping down pipes into the surrounding soil layer of the connection channel excavation area and pumping water, the upper part of the corresponding position of the hole door of the connection channel is reinforced.
The beneficial effects are that: the upper portion that corresponds the position to the portal of contact passageway is consolidated before next construction, avoids pumping water and later stage work progress in the upper portion that corresponds the position of portal collapse.
Further, the upper part of the corresponding position of the tunnel door of the communication channel is reinforced by leading the small guide pipe to be grouted.
The beneficial effects are that: the upper part of the corresponding position of the portal is reinforced by adopting advanced small conduit grouting, and simultaneously, the cracks of the fractured clay layer can be filled, and the downward permeation of the stagnant water on the upper layer through the cracks in the upper clay layer at the corresponding position of the portal is blocked, so that a waterless operation environment is created.
Furthermore, precipitation pipes are respectively driven into soil layers at two ends of the connection channel to perform precipitation construction, wherein the precipitation pipes driven into the soil layers at the two ends of the connection channel are spaced in the length direction of the connection channel.
The beneficial effects are that: the precipitation pipe is squeezed into simultaneously at both ends and efficient precipitation construction is realized, and in addition, the precipitation pipe at both ends utilizes the soil layer to separate the precipitation pipe at both ends along length direction interval, avoids the precipitation pipe to communicate each other and leads to being difficult to the evacuation.
And further, drilling holes in the tunnel pipe sheet, avoiding the joints of the pipe sheet at the positions of the holes and locating at the outer side of the inner excavation boundary line of the communication channel, and then driving down pipes into the holes.
The beneficial effects are that: avoid punching at section of jurisdiction seam crossing and cause too big damage to the tunnel segment, the water to the outside of contact passageway excavation boundary line is simultaneously sucked, and the outside water infiltration excavation regional in boundary when avoiding contact passageway excavation is interior and form mud.
And further, after the precipitation construction is finished, grouting is carried out through a precipitation pipe so as to realize the reinforcement of the surrounding soil layer.
The beneficial effects are that: the used downcomer is utilized for grouting, and the soil layer around the excavation area of the communication channel can be reinforced simply and conveniently.
The tunnel connection channel precipitation construction system of the fractured clay layer adopts the following technical scheme:
a tunnel connection channel precipitation construction system of a fractured clay layer comprises a plurality of precipitation pipes, a plurality of water pipes and a plurality of water pipes, wherein the precipitation pipes are used for being driven into surrounding soil layers of an excavation area of the connection channel; the vacuum pump is connected with the outer end of the downcomer through a pipeline and used for pumping the upper layer stagnant water in the soil layer through the downcomer.
The beneficial effects are that: the negative pressure that forms in the water pumping in-process downcomer can produce suction, pumps the intraformational water of soil around the downcomer, for the intraformational water of soil around the downcomer provides drive power to the infiltration in the downcomer, under the prerequisite of not destroying the clay layer, overcomes the separation of clay layer to last stagnant water, and then promotes the upper layer stagnant water and oozes to the downcomer through fissile clay layer for this precipitation construction can carry out precipitation to fissile clay layer upper layer stagnant water.
Furthermore, the outer ends of the plurality of downcomer pipes are all connected with a main water pumping pipeline through pipelines in a tandem manner, and the vacuum pump is connected with the main water pumping pipeline in series.
The beneficial effects are that: the vacuum pump on the pipeline is always drawn water and each downcomer is pumped simultaneously, the work efficiency of the vacuum pump is improved, in addition, the vacuum pump does not need to be independently arranged for each downcomer, the increase of construction cost is avoided, and the damage of the vacuum pump caused by the small water yield of a single pipe is avoided.
Further, a plurality of downcomer pipes are arranged in a U-shape to surround the communication channel excavation area.
The beneficial effects are that: many downcomer are the U type and carry out half encirclement to the portal corresponding position, can carry out even, thorough suction to stagnant water around the portal corresponding position, avoid local existence not influenced the excavation of later stage contact passageway by the water of suction.
Furthermore, the downcomer includes that one end-sealing, pipe wall are last to set up the body in a large amount of water holes of crossing, and the body is filled with the filter material, and the body be used for with outer end port position removable mounting of tube coupling have prevent that the filter material from being taken out away filter.
The beneficial effects are that: water in the soil layer is filtered by the filter material in the water hole entering pipe body, and soil layer particles in the water seepage are avoided causing the pipeline to block to influence the precipitation effect and lead to the vacuum pump to block up to break down, and also the soil layer particles are avoided losing to bring hidden danger for construction safety, and simultaneously, the filter material is guaranteed to filter and can not be taken out, and the convenience of the use of the precipitation pipe is improved.
Drawings
FIG. 1 is a schematic diagram of the driving position of a downcomer pipe in a tunnel connecting passage dewatering construction method using a fissured clay layer according to embodiment 1 of the invention;
fig. 2 is a schematic structural view of a precipitation pipe of a precipitation construction system used in embodiment 1 of the precipitation construction method for a tunnel connecting channel of a fissured clay layer according to the present invention;
fig. 3 is a schematic structural view of a water filtration cover of a precipitation pipe of a precipitation construction system used in embodiment 1 of the precipitation construction method for a tunnel communication channel of a fissured clay layer according to the present invention;
FIG. 4 is a schematic diagram of the position of a downcomer driven into a soil layer in embodiment 1 of a tunnel communication channel dewatering construction method using a fissured clay layer according to the present invention;
FIG. 5 is a schematic diagram of the position of a downcomer driven into a soil layer in an embodiment 2 of a tunnel communication channel dewatering construction method using a fissured clay layer according to the invention;
in the figure: 1-a downcomer pipe; 2-water outlet pipeline; 3-main water pumping pipeline; 4-a vacuum pump; 5-water through holes; 6-tunnel segment; 7-connecting a channel excavation area; 8, tunneling; 9-seam location; 10-filtering material; 11-a water filtering cover; 12-water filtration holes; 14-boundary line of the portal of the communication channel; 15-digging a boundary in the communication channel; 16-lead small catheter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
The concrete embodiment 1 of the tunnel connection channel precipitation construction method of the fissured clay layer of the invention is as follows: first, the structure and composition of the precipitation construction system used in the precipitation construction method will be described, as shown in fig. 1, the precipitation construction system includes a plurality of precipitation pipes 1, the specific structure of the precipitation pipes 1 is shown in fig. 2, one end of each precipitation pipe 1 is a tip for being inserted into a clay layer, and the other end is an outer end for being connected to a water outlet pipe 2.
As shown in figure 1, the water outlet pipeline 2 connected with the end part of each downcomer 1 is converged to the main water pumping pipeline 3, the main water pumping pipeline 3 is connected with the vacuum pump 4 in series, and when the vacuum pump is used, the vacuum pump 4 pumps the water to form negative pressure in the downcomer 1. As shown in fig. 2, a large number of water holes 5 are formed in the body of the downcomer 1, and water in the clay layer around the downcomer 1 can enter the pipe cavity of the downcomer 1 through the water holes 5. In this embodiment, the precipitation construction system has seven precipitation pipes 1.
In addition, in order to avoid soil layer particles in water from causing pipeline blockage to influence precipitation effect and lead to the vacuum pump 4 to be blocked, hidden dangers brought to construction safety due to soil layer particle loss are also avoided, and the filter material 10 is filled in the pipe body of the precipitation pipe 1 to filter water entering the precipitation pipe 1, so that the soil layer particles are prevented from being lost.
Specifically, the filter material 10 is placed in the filter screen bag and then placed in the precipitation pipe 1, so that the filter material can be conveniently taken out, and after precipitation construction is finished, the filter bag is pulled out, so that the filter material 10 can be conveniently taken out. In addition, the outer end port position of downcomer 1 can be dismantled and install filter lid 11, as shown in fig. 3, has seted up drainage hole 12 on the filter lid 11, and filter lid 11 is adorned soon on downcomer 1, blocks filter material 10 as filtering the piece, prevents that filter material 10 from deviating from the outer end port of downcomer 1, or is siphoned away by the vacuum pump. Meanwhile, when the water outlet pipeline 2 is connected, the water outlet pipeline 2 is directly sleeved on the water filtering cover 11 and is tightened. In this embodiment, the filter material 10 is coarse sand, and in other embodiments, the filter material may also be anthracite, cobblestone, or the like. In other embodiments, a filter screen can be fixed at the outer end port of the downcomer to serve as a filter element. Of course, if the filter material particles are large and can be directly blocked by the filter member, the filter bag may not be provided.
The precipitation construction method of the tunnel connection channel of the fractured clay layer comprises the following steps:
under the condition that tunnel segment 6 has been laid in the tunnel, at first drill on tunnel segment 6, the seam crossing 9 of tunnel segment 6 is avoided to the position of drilling to avoid drilling operation to cause too big destruction to tunnel segment 6, simultaneously, the drilling is located the contact passageway excavation district 7 outside. In this embodiment, since the boundary line 14 of the portal of the contact channel is smaller than the internal excavation boundary 15 of the contact channel, and the internal excavation boundary 15 of the contact channel is the boundary of the contact channel excavation area 7, the drill hole is located outside the internal excavation boundary line 15 of the contact channel to be excavated. In other embodiments, if the boundary line of the portal of the communication channel is the inner excavation boundary of the communication channel or is located outside the inner excavation boundary of the communication channel, the boundary of the portal of the communication channel may be used as the boundary of the excavation region of the communication channel, so that the drill hole is located outside the boundary of the portal of the communication channel.
And (3) driving the downcomer 1 into the drilled hole along the parallel arrangement direction of the two tunnels 8, so that the downcomer 1 is inserted into a soil layer between the two tunnels 8 along the horizontal direction, and sealing a gap between the tunnel segment 6 and the downcomer 1 by clay mud.
Because the fissured clay layer has fissures, if the cracking degree of soil is more serious, the connection between soil blocks is weaker, and the strength is lower, the upper part of the position corresponding to the portal of the communication channel to be excavated is reinforced before the soil is driven into the downcomer 1, and the upper part of the position corresponding to the portal of the communication channel is reinforced by adopting a method of grouting from the advanced small guide pipe 16 into the soil layer. The crack in the soil layer can be filled through the small advanced guide pipe 16 grouting, the soil layer strength is improved, and meanwhile, downward permeation of the stagnation crack is blocked. Specifically, the method of using a small guide pipe to reinforce the soil layer belongs to the prior art, and is not described herein again.
In other embodiments, the upper part of the corresponding position of the tunnel portal of the communication channel to be excavated can be reinforced in other manners, for example, the upper part of the corresponding position of the tunnel portal is reinforced by adopting a pipe shed reinforcing method.
As shown in fig. 4, in this embodiment, based on the tunnel 8, a sufficient operation space can be provided, the driving operation of the downcomer 1 can be performed in the tunnel 8 on one side, the length of the driven downcomer 1 is slightly smaller than the thickness of the soil layer between the two tunnels 8 on the corresponding place, it is ensured that one end of the downcomer 1 inserted into the soil layer does not penetrate out from the other side of the soil layer, the water through hole 5 on the downcomer 1 is prevented from being communicated with the outside, and therefore the vacuum pump 4 can be used for pumping negative pressure in the downcomer 1.
For the driving position of the downcomer 1, as shown in fig. 1, the downcomer 1 is driven into the soil layers on the two sides and the bottom corresponding to the portal of the communication channel to be excavated, the distance between two adjacent downcomers 1 is controlled to be 1.5m-2.0m, in the embodiment, the distance between two adjacent downcomers 1 is 1.8m, and a plurality of downcomers 1 enclose a U shape.
In other embodiments, the distance between two connected downcomer pipes can be adaptively adjusted according to actual working conditions, if the amount of stagnant water on the upper side of the clay layer is large, the distance between two connected downcomer pipes can be made to be less than 1.5m to increase the arrangement density of the downcomer pipes, and if the amount of stagnant water on the upper side of the clay layer is small, the distance between two adjacent downcomer pipes can be made to be more than 2.0 m. Similarly, to the position of squeezing into of downcomer, also can combine operating condition, carry out the adjustment of adaptability, if the infiltration volume of contact passageway excavation district both sides is great, and the infiltration volume of bottom is less can not lead to the fact the influence to the excavation of contact passageway, can only squeeze into the downcomer in contact passageway excavation district both sides. If the infiltration volume of the soil layer of one side of only contact passageway excavation district is great, the infiltration volume of other regions can not cause the influence to the excavation of contact passageway, can only squeeze into the downcomer in one side of contact passageway excavation district.
After the precipitation construction system is installed, the vacuum pump 4 is started, the vacuum pump 4 pumps the interior of the precipitation pipe 1 into negative pressure to suck water in the soil layer around the precipitation pipe 1, the water in the soil layer around the precipitation pipe is driven to permeate into the precipitation pipe, the upper-layer stagnant water is promoted to permeate into the precipitation pipe 1 through the fractured clay layer, and the precipitation of the upper-layer stagnant water of the fractured clay layer is realized. After the precipitation construction is finished, the filter materials and other sundries in the precipitation pipe 1 are removed, and the precipitation pipe 1 is directly used as a grouting pipe to inject grouting plugging holes into the surrounding soil layer so as to reinforce the surrounding soil layer of the excavation area of the communication channel.
The embodiment 2 of the tunnel connection channel precipitation construction method for the fissured clay layers is different from the embodiment 1 in that in the embodiment, as shown in fig. 5, compared with the thickness of the soil layer between two tunnels, the operation space in the tunnels is limited, and a precipitation pipe with the thickness equivalent to that of the soil layer between the two tunnels cannot be driven into the soil layer in a single-side tunnel, so that the precipitation pipe is driven into the tunnels on two sides, the tunnels on two sides are simultaneously subjected to precipitation construction, the length of each precipitation pipe on one side is equivalent to half of the transverse thickness of the soil layer at the corresponding position, and the length of the precipitation pipe on two sides is smaller than the transverse thickness of the soil layer at the corresponding position, so that the distance between the two opposite precipitation pipes is about 0.3m, the precipitation pipes driven into the tunnels on two sides are prevented from being communicated, and the precipitation pipes are ensured to be easily pumped into the tunnels. In other embodiments, the distance between the ends of the precipitation pipes driven into the tunnels from two sides can be adaptively adjusted according to actual working conditions, and can be larger than 0.3m or smaller than 0.3 m.
Different from the embodiment 1, in the embodiment 3 of the tunnel connection channel precipitation construction method for the fissured clay layer, the precipitation construction system is characterized in that the precipitation construction method is implemented by respectively connecting the precipitation pipes on the sides of the precipitation construction system with a vacuum pump so as to form larger suction force in the precipitation pipes and achieve sufficient suction of water in soil layers around the precipitation pipes.
The composition, the structure and the use method of the precipitation construction system of the tunnel connection channel of the fissured clay layer are the same as those of the precipitation construction system in the embodiments, and the detailed description is omitted here.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (10)
1. A precipitation construction method for a tunnel connection channel of a fractured clay layer is characterized by comprising the following steps:
and pumping down pipes into the soil layer around the connection channel excavation area, and pumping water outwards through the down pipes.
2. The method for dewatering construction of a tunnel connecting channel of a fissured clay layer according to claim 1, wherein dewatering pipes are driven into the soil layers on both sides and the bottom of the excavated area of the connecting channel, so that the plurality of dewatering pipes surround the excavated area of the connecting channel in a U shape.
3. The method for dewatering construction of a tunnel connecting channel of a fissured clay layer according to claim 1 or 2, wherein the distance between two adjacent dewatering pipes is 1.5m-2.0 m.
4. The method for dewatering construction of a tunnel connecting channel of a fissured clay layer according to claim 1 or 2, wherein before a dewatering pipe is driven into a surrounding soil layer of an excavation area of the connecting channel and water is pumped, the upper part of the connecting channel at a position corresponding to a tunnel door is reinforced.
5. The method for dewatering construction of a tunnel connection channel of a fissured clay layer according to claim 4, wherein the upper part of the connection channel corresponding to the portal is reinforced by leading small conduit grouting.
6. The method for dewatering construction of a tunnel connecting channel of a fissured clay layer according to claim 1 or 2, characterized in that holes are drilled in the tunnel segment, the positions of the holes are kept away from the segment joints and are positioned outside the excavation boundary line in the connecting channel, and then dewatering pipes are driven into the holes.
7. The precipitation construction method for the tunnel communication channel of the fractured clay layer as claimed in claim 1 or 2, wherein after the precipitation construction is completed, grouting is performed through a precipitation pipe to reinforce the surrounding soil layer.
8. The utility model provides a tunnel contact passageway precipitation construction system on fissile clay layer which characterized by includes:
the plurality of water descending pipes are used for being driven into a surrounding soil layer of the connection channel excavation area;
and the vacuum pump is connected with the outer end of the downcomer through a pipeline and is used for pumping the upper layer stagnant water in the soil layer through the downcomer.
9. The system of claim 8, wherein the plurality of downcomer pipes are arranged in a U-shape to surround the excavated area of the interconnected channel.
10. The tunnel communication channel precipitation construction system for the fissured clay layers as claimed in claim 8 or 9, wherein the precipitation pipe comprises a pipe body with one end sealed and a large number of water through holes formed in the pipe wall, a filter material is filled in the pipe body, and a filter member for preventing the filter material from being drawn away is detachably mounted at the position of an outer end port of the pipe body, which is used for being connected with a pipeline.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113217097A (en) * | 2021-05-19 | 2021-08-06 | 中国建筑第二工程局有限公司 | Deep open type comprehensive dewatering method and water pumping device for subsurface tunnel in water-rich composite stratum |
| CN115680777A (en) * | 2022-12-29 | 2023-02-03 | 山西诚达公路勘察设计有限公司 | Highway tunnel crack is prevented collapsing and is detected filling device |
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| CN115680777A (en) * | 2022-12-29 | 2023-02-03 | 山西诚达公路勘察设计有限公司 | Highway tunnel crack is prevented collapsing and is detected filling device |
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