CN111749292B - Construction process for grooving wall-connecting ground in pipeline dense area - Google Patents
Construction process for grooving wall-connecting ground in pipeline dense area Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000005553 drilling Methods 0.000 claims abstract description 64
- 239000002689 soil Substances 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000007921 spray Substances 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 7
- 238000009432 framing Methods 0.000 claims description 6
- 239000004567 concrete Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 claims description 4
- 238000009933 burial Methods 0.000 claims description 3
- 239000007779 soft material Substances 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 238000009966 trimming Methods 0.000 claims description 2
- 238000004080 punching Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 101150006257 rig-4 gene Proteins 0.000 description 3
- 230000009189 diving Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
- E02F5/10—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
- E21B15/04—Supports for the drilling machine, e.g. derricks or masts specially adapted for directional drilling, e.g. slant hole rigs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/043—Directional drilling for underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/12—Underwater drilling
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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- Geochemistry & Mineralogy (AREA)
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Abstract
The invention relates to a grooving construction process for a diaphragm wall in a pipeline dense area, belonging to the technical field of diaphragm wall construction and comprising the following steps of: surveying the pipeline, and determining the position of the underground pipeline; manufacturing a guide wall and exposing underground pipelines; dividing the whole construction range of the diaphragm wall into groove sections according to the position of the pipeline; utilizing a rotary drilling rig to perform pilot hole forming on one side of the pipeline; installing a jet conduit in the pilot hole; lowering an inclined submersible drilling machine to cut soil below the pipeline; the soil blocks cut by the submersible drilling machine and fallen to the bottom of the pilot hole are discharged from the jet pipe by using a gas lift reverse circulation method, and a groove is formed below the pipeline. The invention has the advantage that the underground pipeline can be constructed without changing the underground pipeline, the underground pipeline can not be damaged in the grooving process, the construction progress can be accelerated, and the construction cost can be saved.
Description
Technical Field
The invention relates to the technical field of diaphragm wall construction, in particular to a diaphragm wall grooving construction process in a pipeline dense area.
Background
Underground diaphragm walls (diaphragm walls) are foundation works. A traditional grooving method for underground diaphragm walls is that a grooving machine is adopted on the ground, a long and narrow deep groove is dug along the peripheral axis of a deep excavation project under the condition of slurry wall protection, a reinforcement cage is hung in the groove after the groove is cleared, then underwater concrete is poured by a conduit method to form a unit groove section, and the steps are carried out section by section in this way, and a continuous reinforced concrete wall is built underground to serve as a structure for water interception, seepage prevention, bearing and water retaining.
The prior Chinese patent with the granted publication number of CN102797252B discloses a construction method of an underground diaphragm wall, which comprises the following specific steps: manufacturing a guide wall, measuring lofting and hole site layout, guiding holes of a rotary drilling rig, grooving by adopting a hydraulic grab bucket or punching a hole by a punching pile machine, installing a reinforcement cage and pouring concrete; in the prior art, after a guide hole is drilled by a rotary drilling rig to form a guide hole face, grooving construction is carried out by adopting a method of combining a hydraulic grab bucket and punching of a punching pile machine.
The Chinese invention patent application with publication number 201711387822.X discloses a construction method for grooving underground continuous walls, which comprises the following steps: dividing a ground to be excavated into a plurality of excavated groove sections according to the design specification of the underground diaphragm wall, and marking a plurality of drilling positions to be drilled above each groove section; preparing mud used in drilling; moving the rotary drilling rig to the excavation ground, adjusting the rotary drilling rig to be in a working state, and aligning a drill bit of the rotary drilling rig to the center of one drilling position; starting the rotary drilling rig, and drilling the hole in a progressive mode at the drilling position, wherein the progressive depth is 2-2.5 m each time; when the first-stage drilling operation of all drilling positions of the groove section is completed by adopting a jump drilling method, the remaining soil and stones between the drilling holes are grabbed by adopting a hydraulic grab bucket to form a first groove body, and then the drilling operation of the next stage is carried out.
The above prior art solutions have the following drawbacks: in the development process of cities, a large number of pipelines are buried underground for urban water supply, power supply, gas transmission, communication cable protection and the like. In the underground pipeline dense area and the underground diaphragm wall grooving process, due to the blockage of the pipeline, the construction method for forming the groove by the grab bucket, punching the groove and rotary drilling the groove is difficult to dig to the groove section below the underground pipeline.
Disclosure of Invention
The invention aims to provide a grooving construction process for an underground diaphragm wall in a pipeline dense area, which has the advantage that grooving construction of the underground diaphragm wall can be carried out without changing an underground pipeline, the underground pipeline cannot be damaged in the grooving process, the construction progress is accelerated, and the construction cost is saved.
The above object of the present invention is achieved by the following technical solutions:
the construction process for grooving the ground connecting wall in the pipeline dense area is characterized by comprising the following steps of:
s1, determining the position, the type, the diameter, the trend and the burial depth of all underground pipelines within the construction area according to the construction requirements:
s2, measuring and paying off, excavating a guide wall groove and completely exposing the part of the pipeline in the guide wall groove; manually cleaning the bottom of the guide wall groove, trimming the side wall, binding reinforcing steel bars on the side wall of the guide wall groove and two sides of the guide wall groove, and pouring concrete to finish the manufacture of the guide wall;
s3, dividing the stratum to be excavated into a plurality of underground diaphragm wall construction groove sections to be formed according to the position of the pipeline;
s4, determining the position of a pilot hole on one side of the pipeline, drilling by using a rotary drilling rig to finish the hole forming of the pilot hole, and simultaneously performing mud wall protection in the hole forming process;
s5, vertically placing the double-layer spray guide pipe at the bottom of the pilot hole, wherein the top end of the spray guide pipe is higher than the ground, and the outer pipe of the spray guide pipe is communicated with an air compressor;
s6, obliquely placing the submersible drilling machine into the pilot hole and enabling the drill bit of the submersible drilling machine to face the soil body below the pipeline;
s7, utilizing a submersible drilling machine to obliquely drill and cut a soil body below a pipeline from top to bottom, and discharging a generated soil block from an opening at the top of a spray guide pipe under the driving of a gas-water mixture formed by mixing high-pressure gas generated by an air compressor and water in an inner pipe of the spray guide pipe after the generated soil block falls into the bottom of a pilot hole; the discharged three-phase fluid enters the pilot hole again for circulation after the mud is precipitated;
s8, repeating the steps S4-S7, grooving soil bodies on the other side of the pipeline and below other pipelines of the construction groove section until grooving operation below the pipeline of the whole construction groove section is completed;
and S9, cleaning the groove wall and the groove bottom of the pipeline construction groove section.
By adopting the technical scheme, the soil body below the pipeline can be removed in the groove forming construction of the diaphragm wall of the pipeline dense area. The inclined submersible drilling machine can move up and down in the pilot hole and extend the drill bit into the lower part of the pipeline to cut soil below the pipeline, so that broken soil falls into the bottom of the pilot hole, and then soil slag enters the spray guide pipe from the bottom of the pilot hole and is discharged from the top of the spray guide pipe under the driving of a gas-lift reverse circulation method, so that grooving operation below the pipeline is realized. According to the technical scheme, the barrier pipeline in the diaphragm wall construction does not need to be changed, so that the construction progress is accelerated, and the construction cost is saved.
The invention is further configured to: the width and the depth of the pilot hole are equal to the design depth and the width of the underground diaphragm wall.
By adopting the technical scheme, one-time pore forming of the pilot hole is realized, segmented drilling is not needed, the submersible drilling rig can drill to the designed depth in the pilot hole at one time, and repeated operation is avoided, so that the construction flow is simplified, and the construction progress is ensured.
The invention is further configured to: the central axis of the pipeline is positioned in the middle of the single diaphragm wall construction groove section.
By adopting the technical scheme, the soil bodies on two sides below the pipeline can be thoroughly cut by the submersible drilling machine, and the situation that the soil bodies cannot be cut below the pipeline due to uneven distribution of the two sides is avoided.
The invention is further configured to: and a protection body for protecting the pipeline is arranged on the guide wall.
Through adopting above-mentioned technical scheme, protect the pipeline, prevent to make the pipeline produce the damage because of reasons such as collision at the in-process of grooving operation.
The invention is further configured to: the protection body comprises protection plates positioned on two sides of the pipeline, the length of each protection plate is matched with the width between the guide walls, and fixing ribs welded with the protection plates respectively are arranged between the protection plates and above the pipeline; the protection body is fixed on the guide wall.
By adopting the technical scheme, the pipeline can be conveniently protected, and the pipeline is easy to install and disassemble.
The invention is further configured to: a distance is reserved between the protection plate and the pipeline, and the bottom end of the protection plate is lower than that of the pipeline; and soft materials are filled in gaps between the protection plates and the pipelines.
Through adopting above-mentioned technical scheme, form the space between guard plate and pipeline, even the collision guard plate can not influence the pipeline yet, the guard plate bottom is less than the pipeline bottom and can plays better guard action to the pipeline.
The invention is further configured to: the dive rig is fixed on the drill jig, the drill jig includes the fixed plate of vertical setting, the fixed plate orientation spouts the splint that the pipe was spouted to the centre gripping on one side of pipe, one side that the fixed plate deviates from spouting the pipe is provided with the backup pad of tilt up, thereby the dive rig is fixed and is made the dive rig tilt up in the backup pad.
By adopting the technical scheme, the submersible drilling machine is arranged on the drill frame and obliquely arranged, the drilling machine can move up and down by taking the jet guide pipe as a track, and the drilling process of the submersible drilling machine can be better controlled.
The invention is further configured to: the nozzle at the top of the spray guide pipe is not less than 2m higher than the ground.
By adopting the technical scheme, as the three-phase fluid is discharged from the nozzle at the top of the spray conduit, the nozzle is set to be higher than the ground by not less than 2m, so that the height difference between the nozzle and the three-phase fluid containing and connecting device is formed, and the three-phase fluid is conveniently conveyed into the containing and connecting device.
The invention is further configured to: and after the pilot hole is formed, hanging a heavy object under the measuring rope to measure the depth of the inspection hole.
By adopting the technical scheme, the depth of the pilot hole is detected, and the hole depth of the pilot hole is ensured to reach the design depth.
The invention is further configured to: and forming grooves in the residual groove sections of the diaphragm wall by using a diaphragm wall groove grabbing machine and/or a rotary drilling rig.
By adopting the technical scheme, other non-pipeline groove sections in the diaphragm wall construction area are quickly constructed, and the construction speed is ensured.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the gas lift reverse circulation method is combined with the obliquely arranged submersible drilling machine to realize the grooving construction of the underground diaphragm wall of the pipeline dense area, the soil body below the pipeline can be conveniently cleaned, and the operation that the pipeline needs to be changed in the construction process is avoided, so that the construction progress is accelerated, and the construction cost is saved;
2. the first guide hole is formed by the rotary drilling rig for one time, so that the submersible drilling rig can directly drill to the designed depth in the first guide hole, thereby avoiding multi-section operation;
3. after the guide wall is manufactured, the protective bodies are arranged around the pipeline, so that the pipeline is prevented from being damaged by accidents such as pipeline collision in the process of grooving operation.
Drawings
FIG. 1 is a flow chart of the construction process for forming grooves on the diaphragm wall of the pipeline dense area;
FIG. 2 is a schematic diagram of the construction process of the invention on site for forming grooves on the ground wall of the pipeline dense area;
FIG. 3 is a schematic structural diagram of a pilot hole of the wall-lining grooving process for pipeline dense areas of the present invention;
FIG. 4 is a schematic cross-sectional view of the spray pipe for the wall-lining grooving process in the pipeline dense area;
FIG. 5 is a schematic structural diagram of a pipeline protection body of the construction process for forming grooves on the underground diaphragm wall in the pipeline dense area;
FIG. 6 is a schematic view of the working state of the submersible drilling rig of the construction process for forming grooves on the ground connecting wall in the pipeline dense area;
FIG. 7 is a schematic structural view of the drill stand for the wall-to-wall grooving construction process in the pipeline dense area.
In the figure, 1, a guide wall; 11. a guide wall groove; 12. a guide rail; 2. a pilot hole; 3. a spray conduit; 31. an inner tube; 32. an outer tube; 4. a submersible drilling rig; 41. a drilling frame; 411. a fixing plate; 412. a splint; 413. a support plate; 5. a pipeline; 6. a protective body; 61. a protection plate; 62. fixing the ribs; 63. a support pillar; 7. a slag hopper; 8. a hanger; 9. an air compressor.
Detailed Description
The present invention is described in further detail below with reference to figures 1-7.
Referring to fig. 1, the invention discloses a flow chart of a construction process for grooving a ground connecting wall in a pipeline dense area. Dense pipelines 5 for water supply, gas, electric power and the like are buried underground in an underground diaphragm wall excavation construction area, and due to the influence of the pipelines 5, the excavation grooving operation of the diaphragm wall cannot be carried out by using a conventional drilling machine hole guiding matched grooving machine grooving construction method.
The construction process for forming the groove in the ground connecting wall of the pipeline dense area specifically comprises the following steps:
s1, pipeline surveying: according to the construction requirements, the positions, types, diameters, trends and burial depths of all underground pipelines 5 in the construction area range are determined and marked.
S2, wall guide manufacturing and pipeline protection: referring to fig. 2 and 3, measuring and paying off, excavating the guide wall groove 11 by using an excavator in cooperation with manual work, completely excavating and exposing the part of the pipeline 5 in the guide wall groove 11, wherein the depth of the guide wall groove 11 is greater than that of the pipeline 5, and a gap is formed between the pipeline 5 and the bottom of the guide wall groove 11; manually cleaning the bottom and finishing the side wall; and (3) binding the construction road steel bars on the two sides of the guide wall groove 11 and the guide wall groove 11, and pouring the side wall of the guide wall groove 11 to form the guide wall 1.
Referring to fig. 3 and 5, after the guide wall 1 is manufactured, the pipeline 5 is protected, and protection bodies 6 are arranged in the guide wall groove 11 at two sides of the pipeline 5 according to the diameter of the pipeline 5 and the angle of the pipeline 5 in the guide wall groove 11.
The shielding 6 comprises shielding plates 61 on both sides of the pipeline. The length of the protection plate 61 is matched with the width between the guide walls 1, a distance is reserved between the protection plate 61 and the pipeline 5, and the distance between the pipeline 5 and the protection plate 61 is not less than 5cm in the embodiment. The bottom end of the protection plate 61 is located below the pipeline 5, and the length of the protection plate 61 extending below the pipeline 5 is not less than 30cm in the embodiment. The shield plate 61 in this example is a 2cm thick steel plate. Fixing ribs 62 welded to the shield plates 61, respectively, are provided between the opposite shield plates 61 at positions above the pipeline 5. The top end of the shielding plate 61 is fixed to the guide wall 1 using the supporting column 63.
The gap between the protection plate 61 and the pipeline 5 is filled with soft materials, such as asphalt felt, so as to ensure no water leakage in the later period.
S3, construction groove section division: and framing the construction groove section of the underground continuous wall according to the position of the transverse pipeline 5, wherein the framing uses the protection frame of the pipeline 5 as the first framing of the underground continuous wall, adjusting the framing lines of the underground continuous wall to two ends, dividing the stratum to be excavated into a plurality of construction groove sections of the underground continuous wall to be formed, and enabling the central axis of the underground pipeline 5 to be positioned in the middle of the construction groove section of the single ground wire continuous wall.
S4, pilot hole forming: referring to fig. 2 and 3, a hole position of the pilot hole 2 is determined on one side of the pipeline 5 according to the position of the pipeline 5, the hole is formed through a rotary drilling rig erected on a hanger 8, the width and the depth of the formed pilot hole 2 are equal to the designed width and the depth of the diaphragm wall, and grouting for preparing mud is performed while the rotary drilling rig drills. After the pilot hole 2 is formed, checking the hole in time, and hanging a weight of 0.5kg under a measuring rope to measure whether the depth of the checking hole reaches the designed depth.
S5, mounting a spray guide pipe: referring to fig. 3 and 4, the injection conduit 3 is vertically inserted into the bottom of the pilot hole 2, and the injection conduit 3 is a double-walled conduit and comprises an inner pipe 31 and an outer pipe 32, wherein the outer pipe 32 is an air supply pipe, and the inner pipe 31 is a slurry discharge pipe. The bottom of the outer tube 32 is higher than the bottom of the inner tube 31, and the bottom of the outer tube 32 communicates with the inner tube 31 through a gas-water mixer.
Referring to fig. 2, the nozzle at the top end of the spray conduit 3 is not less than 2m higher than the ground. The top of the outer pipe 32 of the spray conduit 3 is closed and communicated with an air compressor 9.
S6, mounting the submersible drilling machine: referring to fig. 2 and 6, the submersible drilling rig 4 is obliquely mounted on a drill frame 41, the drill frame 41 is mounted outside the jet pipe 3 and can move along the jet pipe 3 under the action of the hanging bracket 8, and the drill head of the submersible drilling rig 4 faces the soil below the pipeline 5. The number of submersible drilling rigs 4 is two. The submersible drilling rig 4 is telescopic so that it can reach the drill bit into the soil below the pipeline 5.
Referring to fig. 6 and 7, the boom 41 includes a fixing plate 411 vertically disposed, and the width of the fixing plate 411 matches the width of the pilot hole 2. A clamping plate 412 connected with the spray pipe 3 in a sliding manner is arranged on one side of the fixing plate 411 facing the spray pipe 3, and the drill stand 41 can ascend and descend along the axial direction of the spray pipe 3 under the pulling of the steel cable under the matching of the fixing plate 411 and the clamping plate 412.
One side of the fixing plate 411 facing away from the spray pipe 3 is provided with a supporting plate 413 which is inclined downwards, and the submersible drilling machine 4 is fixed on the supporting plate 413 so that the submersible drilling machine 4 is inclined downwards in an inclined way.
S7, forming grooves on the ground connecting wall: referring to fig. 2 and 6, the diving drill 4 obliquely drills and cuts the soil below the pipeline 5 from top to bottom under the action of the hanger 8, and soil blocks and soil scraps produced by cutting of the diving drill 4 fall into the pilot hole 2; simultaneously starting an air compressor 9 to convey high-pressure gas to the bottom of the pilot hole 2, spraying three-phase fluid formed by gas, slurry and mud from an opening at the top of an inner pipe 31 of the spray guide pipe 3, and continuously replenishing slurry into the pilot hole 2 in the process of forming a groove; when the submersible drilling machine 4 drills to the designed depth, the drilling is stopped.
The grooving method in this embodiment adopts a gas lift reverse circulation method, air enters the outer pipe 32 to reach the lower part of the pilot hole 2 under the action of the air compressor 9, then enters the inner pipe 31 through a gas-water mixer arranged at the joint of the inner pipe 31 and the outer pipe 32 at the lower part of the spray guide pipe 3, high-pressure gas and muddy water are mixed to form a gas-water mixture with the density smaller than that of water, and as the gas is continuously input to the bottom of the pilot hole 2, the density of the muddy water in the inner pipe 31 is smaller than that of the muddy water outside the outer pipe 32, and a pressure difference between the muddy water in the inner pipe 31 and the pilot hole 2 is formed. Soil drilled and cut by the submersible drilling machine 4 falls into the bottom of the pilot hole 2 and is discharged from the inner pipe 31 under the drive of the gas-water mixture.
The guide rail 12 is provided with a slag hopper 7 opposite to the top outlet of the spray guide pipe 3. The slag bucket 7 is used for containing three-phase fluid discharged from the spray pipe 3, the slag bucket 7 is transported to a sedimentation tank for sedimentation after reaching a certain amount, and the settled slurry enters the slurry tank again and circularly enters the pilot hole 2 under the action of the slurry pump to play roles of digging a groove, protecting walls and conveying soil residues.
S8, repeating the steps S4-S7 to form the groove on the soil body on the other side of the pipeline 5 and below the other pipelines 5 of the groove section.
And S9, grooving the rest groove sections by using a ground connection wall groove grabbing machine and/or a rotary drilling rig until the grooving of the whole ground connection wall is finished, wherein the groove grabbing machine keeps a certain construction safety distance from the pipeline 5, and the soil body is guaranteed to be hollowed without touching the pipeline 5.
S10, cleaning the groove: and brushing the wall of the tank wall for cleaning, cleaning sediment at the bottom of the tank, and waiting for lowering the steel reinforcement cage.
The invention adopts the gas lift reverse circulation method to construct the underground diaphragm wall under the condition of not damaging the ground wire pipeline 5, and can solve the trouble that the obstacle pipeline 5 constructs the underground diaphragm wall, thereby accelerating the construction progress and saving the construction cost.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. The construction process for grooving the ground connecting wall in the pipeline dense area is characterized by comprising the following steps of:
s1, determining the positions, types, diameters, trends and burial depths of all underground pipelines (5) in the construction area range according to construction requirements;
s2, measuring and paying off, excavating a guide wall groove (11), completely exposing the part of the pipeline (5) in the guide wall groove (11), wherein the depth of the guide wall groove (11) is greater than that of the pipeline (5); manually cleaning the bottom of the guide wall groove (11), trimming the side wall, binding reinforcing steel bars on the side wall of the guide wall groove (11) and two sides of the guide wall groove (11), and pouring concrete to finish the manufacture of the guide wall (1);
the pipeline (5) protection is carried out after the guide wall (1) is finished, a protection body (6) for protecting the pipeline (5) is arranged on the guide wall (1), the protection body (6) comprises protection plates (61) positioned on two sides of the pipeline (5), the length of each protection plate (61) is matched with the width of the guide wall (1), and fixing ribs (62) welded with the protection plates (61) respectively are arranged between the protection plates (61) and above the pipeline (5); the protection plate (61) is fixed on the guide wall (1) by utilizing a support column (63);
s3, framing the construction groove section of the underground diaphragm wall according to the position of the pipeline (5), framing the diaphragm wall by taking the protection diaphragm of the pipeline (5) as the first diaphragm wall, and adjusting the diaphragm lines of the underground diaphragm wall to two ends; dividing a stratum to be excavated into a plurality of underground continuous wall construction groove sections to be formed;
s4, determining the hole position of the pilot hole (2) on one side of the pipeline (5), drilling by using a rotary drilling rig to finish the hole forming of the pilot hole (2), and simultaneously performing mud wall protection in the hole forming process;
s5, vertically placing a double-layer spray guide pipe (3) at the hole bottom of the pilot hole (2), wherein the top end of the spray guide pipe (3) is higher than the ground, the spray guide pipe (3) comprises an inner pipe (31) and an outer pipe (32), the outer pipe (32) is an air supply pipe, the inner pipe (31) is a slurry discharge pipe, the bottom of the outer pipe (32) is communicated with the inner pipe (31), and the outer pipe (32) of the spray guide pipe (3) is communicated with an air compressor (9);
s6, the telescopic submersible drilling machine (4) is installed on a drill frame (41), the drill frame (41) is installed outside the spray guide pipe (3) and can move along the spray guide pipe (3) under the action of a hanging bracket (8), the submersible drilling machine (4) is obliquely placed into the pilot hole (2), and a drill bit of the submersible drilling machine (4) faces the soil body below the pipeline (5);
s7, soil below the pipeline (5) is drilled and cut obliquely from top to bottom by using a submersible drilling rig (4), and the generated soil blocks fall into the bottom of the pilot hole (2) and are discharged from an opening at the top of the spray guide pipe (3) under the driving of a gas-water mixture formed by mixing high-pressure gas generated by an air compressor (9) and water in an inner pipe (31) of the spray guide pipe (3); the discharged three-phase fluid falls into a movable slag hopper (7) on the ground, the three-phase fluid discharged from the slag hopper (7) is conveyed to a sedimentation tank for sedimentation treatment, and the sedimentated slurry enters the pilot hole (2) again for circulation;
s8, repeating the steps S4-S7, and grooving soil bodies on the other side of the pipeline (5) and below other pipelines (5) of the construction groove section until grooving operation below the pipeline (5) of the whole construction groove section is completed;
and S9, cleaning the groove wall and the groove bottom of the construction groove section of the pipeline (5).
2. The pipeline-dense-area ground wall grooving construction process according to claim 1, characterized in that: the width and the depth of the pilot hole (2) are equal to the design depth and the width of the underground diaphragm wall.
3. The pipeline-dense-area ground wall grooving construction process according to claim 1, characterized in that: the central axis of the pipeline (5) is positioned in the middle of the single diaphragm wall construction groove section.
4. The pipeline-dense-area ground wall grooving construction process according to claim 1, characterized in that: a distance is reserved between the protection plate (61) and the pipeline (5), the distance between the pipeline (5) and the protection plate (61) is not less than 5cm, the bottom end of the protection plate (61) is lower than the bottom end of the pipeline (5), and the length of the protection plate (61) extending into the lower portion of the pipeline (5) is not less than 30 cm; and a gap between the protection plate (61) and the pipeline (5) is filled with soft materials.
5. The pipeline-dense-area ground wall grooving construction process according to claim 1, characterized in that: the drilling rig (41) comprises a vertically arranged fixing plate (411), the width of the fixing plate (411) is matched with that of the pilot hole (2), a clamping plate (412) for clamping the spray pipe (3) is arranged on one side, facing the spray pipe (3), of the fixing plate (411), an upward inclined supporting plate (413) is arranged on one side, facing away from the spray pipe (3), of the fixing plate (411), and the submersible drilling rig (4) is fixed on the supporting plate (413) so that the submersible drilling rig (4) inclines downwards.
6. The pipeline-dense-area ground wall grooving construction process according to claim 1, characterized in that: the top orifice of the spray conduit (3) is not less than 2m higher than the ground.
7. The pipeline-dense-area ground wall grooving construction process according to claim 1, characterized in that: and after the pilot hole (2) is formed, hanging a heavy object under the measuring rope to measure the depth of the inspection hole.
8. The pipeline-dense-area ground wall grooving construction process according to claim 1, characterized in that: and forming grooves in the residual groove sections of the diaphragm wall by using a diaphragm wall groove grabbing machine and/or a rotary drilling rig.
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| CN113914299A (en) * | 2021-11-18 | 2022-01-11 | 中铁二局集团有限公司 | Construction method of underground diaphragm wall penetrating through foundation pit pipeline |
| CN113981952A (en) * | 2021-12-07 | 2022-01-28 | 中国铁建大桥工程局集团有限公司 | Air-lift reverse circulation cutter-suction type underground continuous wall construction method and underground continuous wall |
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| US5484232A (en) * | 1993-03-03 | 1996-01-16 | Tokyo Gas Company Ltd. | Method for injecting lubricant and filler in the pipe-jacking method |
| CN104264708A (en) * | 2014-09-30 | 2015-01-07 | 安徽跨宇钢结构网架工程有限公司 | Sequential construction technology for underground diaphragm wall of highline rotational-flow pond |
| CN108252296A (en) * | 2018-01-19 | 2018-07-06 | 中铁上海工程局集团有限公司 | A kind of method of diaphram wall pipeline in-situ conservation construction |
| CN110106882A (en) * | 2019-04-28 | 2019-08-09 | 云南建投第一勘察设计有限公司 | A kind of gas lift reverse circulation device for cast-in-situ bored pile |
| CN110318388B (en) * | 2019-06-24 | 2021-04-20 | 中国路桥工程有限责任公司 | Underground continuous wall excavation grooving method |
| CN111058458A (en) * | 2019-12-23 | 2020-04-24 | 中铁第一勘察设计院集团有限公司 | Construction method and structure based on cutter suction type ground connecting wall local replacement row pile support |
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