CN113175350A - Construction method of water-rich sand layer wastewater pump house - Google Patents
Construction method of water-rich sand layer wastewater pump house Download PDFInfo
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- CN113175350A CN113175350A CN202110414675.0A CN202110414675A CN113175350A CN 113175350 A CN113175350 A CN 113175350A CN 202110414675 A CN202110414675 A CN 202110414675A CN 113175350 A CN113175350 A CN 113175350A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 88
- 238000010276 construction Methods 0.000 title claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 239000004576 sand Substances 0.000 title claims abstract description 47
- 239000011440 grout Substances 0.000 claims abstract description 81
- 239000002689 soil Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 38
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 230000000694 effects Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 239000004567 concrete Substances 0.000 claims description 57
- 238000005507 spraying Methods 0.000 claims description 40
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 238000009412 basement excavation Methods 0.000 claims description 22
- 239000002002 slurry Substances 0.000 claims description 18
- 229920001875 Ebonite Polymers 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 10
- 235000019353 potassium silicate Nutrition 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 238000007689 inspection Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 239000011378 shotcrete Substances 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims 1
- 238000007664 blowing Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 claims 1
- 230000011218 segmentation Effects 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000013467 fragmentation Methods 0.000 description 3
- 238000006062 fragmentation reaction Methods 0.000 description 3
- 238000007569 slipcasting Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003756 stirring Methods 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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- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- Life Sciences & Earth Sciences (AREA)
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The application relates to the technical field of wastewater pump rooms in subway sections, in particular to a construction method of a wastewater pump room with a water-rich sand layer, which comprises the following steps: s1, measuring and setting line, and positioning the well; s2, excavating a well body; s3, sealing the bottom of the vertical shaft; s4, constructing a connection channel and a tunnel; s5, excavating a foundation pit of the waste water pump house; s6, construction of a grout stopping wall: applying a grout stop wall on the surface of an excavated soil body of the waste water pump room, wherein a one-way valve penetrating through the grout stop wall is fixedly arranged in the grout stop wall; s7, hole forming construction; drilling holes at the periphery of the grout stopping wall; s8, construction of floral tubes: driving the perforated pipe into the perforated pipe immediately after finishing the hole forming in S7; s9, deep hole grouting construction: the grouting holes are arranged at the bottom of the waste water pump room in a quincunx shape; s10, grouting effect detection: adopt the drilling to get the core method sample, this application has the possibility that reduces to gush water and gush out the sand accident in the waste water pump house work progress, reduces the effect of ground unstability risk.
Description
Technical Field
The application relates to the technical field of wastewater pump rooms in subway sections, in particular to a construction method of a wastewater pump room with a water-rich sand layer.
Background
In order to collect the leakage water and the fire-fighting wastewater of the tunnel between the subways, a wastewater pump room is required to be arranged at the lowest point of the tunnel between the subways, and the wastewater pump room mainly comprises a water collecting pool, a drainage pump and a pressure drainage pipeline.
The common subway interval waste water pump house is built together with the communication channel, namely, the waste water pump house is arranged under the communication channel in an excavating mode, then a reinforced concrete bottom plate and a side wall are constructed, and waste water flows to a water collecting tank from a drainage ditch of a track bed through pre-buried steel pipes and is discharged after being lifted by a drainage pump.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: for the subway interval wastewater pump house, because the wastewater of two subway interval tunnels is discharged into the wastewater pump house, the volume requirement of the wastewater pump house is large, the corresponding excavation range and the depth are also large, and the construction layer is positioned in the underground water-rich sand layer, so that the water-inrush and sand-inrush accidents are easy to happen in the construction process, and the foundation instability risk is high.
Disclosure of Invention
In order to reduce the unexpected possibility of gushing water and gushing sand in the waste water pump house work progress and reduce the risk of ground instability, the application provides a water-rich sand layer waste water pump house construction method.
The application provides a rich water sand bed waste water pump house construction method adopts following technical scheme: a construction method of a water-rich sand layer wastewater pump house comprises the following steps:
s1, measuring and setting line, and positioning the well;
s2, excavating a well: excavating within 3m below the ground by adopting an excavator directly, excavating manually below 3m, vertically lifting the earthwork by using a gantry crane grab bucket, and immediately hanging a steel net rack and spraying concrete after the excavation is finished;
s3, shaft sealing bottom: after the construction of the side wall of the vertical shaft is finished, constructing bottom sealing concrete;
s4, constructing a connection channel and a tunnel: excavating an interconnection channel and a tunnel, and simultaneously constructing a primary lining, a secondary lining and a waterproof layer of the interconnection channel and the tunnel;
s5, excavating a foundation pit of the waste water pump house: excavating a waste water pump room in the middle of the communication channel in a manual excavation mode;
s6, construction of a grout stopping wall: constructing a grout stop wall on the surface of an excavated soil body of the waste water pump house, wherein the grout stop wall is made of C30 concrete, at least two layers of reinforcing steel bar net sheets are embedded in the grout stop wall, and a one-way valve penetrating through the grout stop wall is fixedly arranged in the grout stop wall;
s7, hole forming construction; drilling holes on the periphery of the grout stopping wall by using a small underground drill, wherein the drill rod of the drill is an assembled drill rod, and chemical grout is injected simultaneously in the hole forming process;
s8, construction of floral tubes: arranging single-row perforated pipes around the waste water pump house, driving perforated pipes into the holes immediately after the holes are formed in S7, wherein the construction sequence is that one perforated pipe is arranged at intervals, the perforated pipes are inserted below the excavation surface, the range of the outer insertion angles of the perforated pipes positioned at the four corners of the waste water pump house is 10-20 degrees, grouting construction is carried out after the perforated pipes are driven, and slurry adopts cement and water glass double-liquid slurry;
s9, deep hole grouting construction: all grouting holes are arranged at the bottom of the waste water pump house in a quincunx shape, a tunnel drilling machine is adopted to vertically drill into the position below an excavation surface at the bottom of the waste water pump house, chemical grout is adopted to stop water in the hole forming process, and a retreating grouting method is adopted to inject cement and water glass double-grout after drilling to a designed elevation;
s10, grouting effect detection: the method is characterized in that the grout stopping wall and the bottom of the waste water pump room are uniformly provided with inspection holes, sampling is carried out by adopting a drilling coring method, and grouting and backfilling are carried out on the inspection holes by adopting the same deep hole grouting mode after coring.
By adopting the technical scheme, when the shaft is excavated, the shaft excavation construction can be efficiently carried out by adopting the modes of excavating by the excavator and manually excavating and vertically lifting the earthwork by the gantry crane grab bucket, the risk of gushing water and sand can be reduced by immediately hanging the steel net rack and spraying concrete after the shaft excavation is finished, and the construction safety and the construction quality of the shaft are improved. The grout stopping wall is used as a structural wall body of the waste water pump house, the risk of water gushing and sand gushing of a soil body can be reduced, and the structural strength of the grout stopping wall can be reinforced by embedding at least two layers of reinforcing steel bar net sheets in the grout stopping wall; in the construction process, if the water gushing and sand gushing condition occurs, chemical slurry can be directly injected into the soil body through the one-way valve to control the water gushing and sand gushing condition for the need from time to time. The assembled drill rod can adapt to the low construction space of the communication channel, so that the pore-forming construction can be efficiently carried out; because the contact channel is located rich water sand bed, pour into chemical slurry simultaneously at the pore-forming in-process, can greatly reduce the risk of gushing water and gushing sand. The floral tube is driven in at intervals, so that the concentrated stress of construction can be reduced, and the soil body is stable; the perforated pipes positioned at the four corners of the waste water pump room are inclined towards the direction far away from the waste water pump room and are driven, the range of the external insertion angle of the perforated pipes is 10-20 degrees, and after the perforated pipes are grouted in the deep holes, the grout stop wall can be further reinforced, so that the risk of water burst and sand gushing is further reduced. All the grouting holes are arranged at the bottom of the waste water pump room in a quincunx shape, so that the grouting can be uniformly performed on the bottom of the waste water pump room through the grouting holes, and the compactness of the bottom of the waste water pump room is improved; and after drilling to the designed elevation, a retreating type grouting method is adopted, so that the time for exposing the hole wall of the grouting hole can be shortened, and the risk of water burst and sand burst is reduced.
Optionally, in step S2, the water is lowered 30 days in advance, then the shaft foundation pit is excavated, and before the shaft foundation pit is excavated, the shaft locking collar and the short wall thereof are constructed around the wellhead.
By adopting the technical scheme, the soil quality of the vertical shaft can be softened by 30 days of precipitation in advance, and the vertical shaft is easy to excavate; before a shaft foundation pit is excavated, a shaft locking ring and an upper short wall of the shaft locking ring are constructed on the periphery of a well mouth to serve as reference objects of the center of the shaft, so that the center of the shaft can be positioned in real time, and the locking ring and the upper short wall of the locking ring can also reinforce soil around the shaft, prevent soil from collapsing and ensure smooth construction of shaft excavation.
Optionally, in step S2, before spraying the concrete, checking the size of the excavated cross section, removing dangerous stones and rock debris at the wall bottom, when there are water gushing, water drenching and concentrated water outlet points on the sprayed surface, drainage treatment is performed first, dust and debris on the excavated surface are cleaned with water or wind, and the concrete is sprayed and protected in time after primary support forming, the sprayed concrete adopts a wet spraying process, a wet spraying machine is adopted to spray the concrete once to cover the steel net rack, and during spraying, the admixture is firstly sprayed, then the air is sprayed, and then the material is fed, so that the bonding is easy, the rebound amount is small, and the surface gloss is wet.
By adopting the technical scheme, the construction quality of the sprayed concrete can be improved by removing the dangerous stones and rock slag of the wall bottoms; the wet spraying method can improve the construction quality of the vertical shaft wall, the additive is added into the concrete to improve the adhesion of the concrete, the strength of the vertical shaft wall can be improved after the concrete is solidified, the resilience of the vertical shaft wall is reduced, and the surface gloss of the vertical shaft wall is improved.
Optionally, in step S2, the nozzle is always perpendicular to the rock face.
By adopting the technical scheme, the nozzles are always kept vertical to the rock surface, so that concrete sprayed by the nozzles can be uniformly sprayed on the soil surface of the wall of the vertical shaft well, and the construction quality and the size precision of the vertical shaft are improved.
Alternatively, in step S2, the spraying operation is performed in a segmented, sliced, layered, bottom-up sequence, with larger depressions, and then first sprayed and leveled.
By adopting the technical scheme, the construction quality and the dimensional accuracy of the vertical shaft can be improved by filling the larger concave position by spraying, the concrete sprayed on the surface of the well wall soil body inevitably flows towards the bottom direction under the action of gravity, and the spraying operation is performed in sequence of segmentation, fragmentation, layering and bottom-up, so that the fluidity of the concrete can be utilized, the waste of the concrete is reduced, the using amount of the concrete is saved, and the construction cost is reduced.
Optionally, in step S2, the admixture content is 5% to 10%, after the admixture is added, the admixture is uniformly stirred in a wet spraying machine, and when the concrete is sprayed, the surface of the sprayed layer is smooth and smooth, and the phenomenon of dry spots or slip flow is reduced.
By adopting the technical scheme, a large amount of actual construction experience is summarized, and the doping amount of the admixture accounts for 5-10%, so that various performances of the concrete can reach a better degree; the admixture and the concrete are uniformly stirred in the wet spraying machine, so that the uniformity of the overall performance of the concrete can be improved, the construction quality of a vertical shaft is improved, the surface of a sprayed layer can be smoother and smoother, and the occurrence of dry spots or slip and flow phenomena is reduced.
Optionally, in step S6, a mounting opening is reserved during the construction of the grout stop wall, a thin steel plate is fixedly connected in the mounting opening through an expansion bolt, the check valve penetrates through the thin steel plate and is fixedly connected with the thin steel plate, the check valve penetrates through the grout stop wall and is embedded into the soil, and after the check valve is mounted, concrete is poured to seal and fill the mounting opening and expose the liquid injection opening of the check valve.
By adopting the technical scheme, the mounting port provides mounting positions for the thin steel plate and the one-way valve, so that the thin steel plate and the one-way valve can be stably embedded into the grout stop wall, and after the one-way valve is mounted, the concrete is poured to seal and fill the mounting port, so that the mounting firmness of the one-way valve can be further strengthened, the integrity of the grout stop wall can be kept, and the strength of the grout stop wall is improved; if the water gushing and sand gushing condition occurs, the chemical slurry is directly injected into the soil body through the one-way valve to control the water gushing and sand gushing condition for the need from time to time.
Optionally, in step S7, the hole forming operation may be performed after the concrete strength of the grout stopping wall reaches 85% of the design strength in the hole forming construction, and the drilling machine directly drills into the soil body near the grout stopping wall to form the hole after adjusting the angle.
By adopting the technical scheme, after the concrete strength of the grout stopping wall reaches 85% of the design strength, the grout stopping wall reaches higher hardness and strength, and at the moment, a drilling machine directly drills into a soil body near the grout stopping wall to perform hole forming operation, so that the grout stopping wall is not influenced.
Optionally, in step S8, a hard rubber ring is filled in the gap between the floral tube and the soil body, and a steel sleeve is driven to squeeze the hard rubber ring.
By adopting the technical scheme, the steel sleeve can tightly extrude the hard rubber ring, so that the hard rubber ring stably seals the peripheral area of the bottom end of the floral tube; the hard rubber ring can reduce the risk of the situations of slurry leakage, slurry overflow and the like in the grouting process of the perforated pipe.
Optionally, in step S9, after the grouting at the bottom of the waste water pump house is completed, the retreating type grouting is still adopted in the process of lifting the drill rod, and cement and water glass double-liquid slurry is injected into the excavated soil body.
Through adopting above-mentioned technical scheme, adopt the formula of retreating slip casting at the in-process that the drilling rod promoted, can reduce the time that the injected hole exposes, reduce the risk of gushing water and gushing sand, simultaneously, can make the sand in the waste water pump house hole end have good uprightness nature and stability.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the grout stopping wall is arranged and serves as a structural wall of the waste water pump house, so that the risk of water gushing and sand gushing of a soil body can be reduced, and the structural strength of the grout stopping wall can be reinforced by embedding at least two layers of reinforcing mesh sheets in the grout stopping wall;
2. by arranging the one-way valve, in the construction process, if the water gushing and sand gushing conditions occur, chemical slurry can be directly injected into the soil body through the one-way valve to control the water gushing and sand gushing conditions for the occasional need;
3. through set up single floral tube all around in waste water pump house, can further consolidate and end the thick liquid wall after the slip casting of floral tube deep hole, further reduce the risk of gushing water and gushing sand.
Drawings
FIG. 1 is a schematic structural diagram of a construction method of a water-rich sand layer wastewater pump house according to an embodiment of the application;
FIG. 2 is a cross-sectional view embodying a rebar mesh;
FIG. 3 is a schematic view showing the structure of a floral tube;
FIG. 4 is a schematic view showing the structure of a grouting hole.
Description of reference numerals: 1. a shaft; 11. a locking collar; 12. mounting a low wall; 2. a communication channel; 3. a tunnel; 4. a wastewater pump house; 41. grouting holes; 5. a grout stopping wall; 51. an installation port; 52. reinforcing mesh sheets; 6. a one-way valve; 61. a thin steel sheet; 62. an expansion bolt; 7. a floral tube; 71. a hard rubber ring; 72. a steel casing.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses a construction method of a water-rich sand layer wastewater pump room, which comprises the following steps:
and S1, referring to FIG. 1, measuring and determining the center position of the shaft 1 at a construction site by using a level and a theodolite according to a construction drawing, and paying off and positioning.
S2, referring to fig. 1, 30 days in advance, lowering water at the excavation position of the vertical shaft 1 to soften soil, excavating a foundation pit of the vertical shaft 1 after 30 days, and constructing a locking ring 11 of the vertical shaft 1 and an upper short wall 12 of the vertical shaft 1 at the periphery of a well head before excavating the foundation pit of the vertical shaft 1.
Referring to fig. 1, a vertical shaft 1 is directly excavated in 3m below the ground by an excavator, a manual vertical shaft 1 is excavated in 3m below the ground, a gantry crane is fixedly arranged above a well mouth of the vertical shaft 1, a grab bucket of the gantry crane vertically lifts the excavated earth of the vertical shaft 1, and a steel net rack is hung on the earth surface of the vertical shaft 1 immediately after the vertical shaft 1 is excavated and concrete is sprayed.
Referring to fig. 1, after the shaft 1 is excavated, before concrete is sprayed on the surface of the shaft wall of the shaft 1, the size of the excavated section of the shaft 1 is checked, dangerous stones and rock fragments at the wall bottom are removed, when water gushing, water drenching and concentrated water outlet points exist on the sprayed surface, drainage treatment is firstly carried out, dust and sundries on the excavated surface are cleaned by water or wind, and the sprayed and protected in time after primary support forming.
Referring to fig. 1, the concrete is sprayed by a wet spraying process, a wet sprayer is used for spraying the concrete once to cover the steel net rack, the spraying operation is performed in a segmentation, slicing and layering mode, the spraying operation is performed sequentially from bottom to top, and the concrete is sprayed and filled first at a position with a large concave. The construction quality and the dimensional accuracy of the vertical shaft 1 can be improved by filling the larger concave position by spraying, the concrete sprayed on the surface of the well wall soil body inevitably flows towards the bottom of the well under the action of gravity, and the spraying operation is performed in sequence of segmentation, fragmentation, layering and from bottom to top, so that the flowability of the concrete can be utilized, the waste of the concrete is reduced, the using amount of the concrete is saved, and the construction cost is reduced.
Referring to fig. 1, the concrete is doped with the admixture, the proportion of the admixture is 5% -10%, after the addition of the admixture is finished, the admixture is uniformly stirred in the wet spraying machine by using an external stirrer, the uniformity of the overall performance of the concrete can be improved by uniformly stirring the admixture and the concrete in the wet spraying machine, and the construction quality of the vertical shaft 1 is improved. When spraying, the admixture is firstly opened, then air is opened, and then the material is fed, so that a nozzle of the wet spraying machine is always vertical to the rock surface, the surface of a sprayed layer is flat and smooth, the phenomenon of dry spots or slip and flow is reduced, and the construction accuracy of the shaft wall of the vertical shaft 1 is achieved by easy adhesion, small resilience and moist and glossy surface.
S3, referring to fig. 1, after the circumferential side wall of the shaft 1 is constructed, a concrete bottom is poured to the bottom of the shaft 1.
S4, referring to fig. 1, horizontally excavating a connection channel 2 and a tunnel 3 at the position close to the bottom of a vertical shaft 1 on the circumferential inner wall of the vertical shaft 1, and simultaneously and sequentially constructing a primary lining, a secondary lining and a waterproof layer of the connection channel 2 and the tunnel 3, wherein the connection channel 2 is communicated with the tunnel 3 and the vertical shaft 1.
S5, referring to the figure 1 and the figure 2, the waste water pump house 4 is excavated in the middle of the communication channel 2 by adopting a manual excavation mode to form a foundation pit of the waste water pump house 4.
S6, referring to fig. 2 and 3, at least two layers of steel mesh sheets 52 are fixedly connected to the surface of the foundation pit soil body of the waste water pump house 4, C30 concrete is sprayed to construct the grout stop wall 5, and the steel mesh sheets 52 serving as a framework of the grout stop wall 5 can reinforce the structural strength of the grout stop wall 5.
Referring to fig. 2 and 3, a mounting opening 51 facing the interior of the waste water pump room 4 is reserved when the grout stop wall 5 is constructed, a thin steel plate 61 is fixedly connected in the mounting opening 51 through an expansion bolt 62, a check valve 6 is fixedly penetrated through the thin steel plate 61, the check valve 6 penetrates through the grout stop wall 5 and is embedded in a soil body, and after the check valve 6 is installed, concrete is poured to seal and fill the mounting opening 51 and expose a liquid injection opening of the check valve 6. If the water gushing and sand gushing are generated, chemical slurry is directly injected into the soil body through the one-way valve 6 to control the water gushing and sand gushing condition for the need from time to time.
And S7, referring to the figure 2 and the figure 3, after the concrete strength of the grout stopping wall 5 reaches 85% of the design strength, performing hole forming operation, and after the angle is adjusted by a drilling machine, directly drilling into the soil body near the grout stopping wall 5 to perform hole forming operation. After the concrete strength of the grout stopping wall 5 reaches 85% of the design strength, the grout stopping wall 5 reaches higher hardness and strength, and at the moment, a drilling machine directly drills into the soil body near the grout stopping wall 5 to perform hole forming operation, so that the grout stopping wall 5 cannot be influenced.
Referring to fig. 2 and 3, a small tunnel drilling machine is used for drilling a single row of holes on the periphery of the grout stopping wall 5, the hole forming construction sequence is one-to-one, the drill rod of the drilling machine is an assembled drill rod, chemical grout is injected simultaneously in the hole forming process, and the risk of water gushing and sand gushing can be greatly reduced in the hole forming construction process.
S8, referring to fig. 3 and 4, a single row of floral tubes 7 are inserted into soil around the waste water pump room 4, the floral tubes 7 are provided with a plurality of grouting holes 41, the floral tubes 7 are driven into the holes immediately after the holes are formed, the construction sequence is that the floral tubes 7 are inserted into the excavated surface, the floral tubes 7 at four corners of the waste water pump room 4 are inclined towards the direction far away from the waste water pump room 4, and the range of the external insertion angle is 10-20 degrees. The gap between the perforated pipe 7 and the soil body is filled with the hard rubber ring 71, the hard rubber ring 71 is driven into the steel sleeve 72 to tightly extrude the hard rubber ring 71, the steel sleeve 72 can tightly extrude the hard rubber ring 71, the hard rubber ring 71 can stably seal the peripheral area of the bottom end of the perforated pipe 7, and the hard rubber ring 71 can reduce the risk of the perforated pipe 7 in the grouting process, such as slurry leakage, slurry bleeding and the like. And finally, carrying out deep hole grouting construction through the perforated pipe 7, wherein the grout adopts cement and water glass double-liquid grout.
Referring to fig. 3 and 4, after the deep hole grouting is carried out through the perforated pipe 7, the grout stop wall 5 can be further reinforced, and the risk of water inrush and sand inrush of the wastewater pump room 4 is further reduced.
S9, referring to FIGS. 3 and 4, a tunnel drilling machine is adopted to vertically drill into the position below the excavation surface at the bottom of the waste water pump room 4 to carry out deep hole grouting construction, chemical grout is adopted to stop water in the hole forming process, all grouting holes 41 are arranged at the bottom of the waste water pump room 4 in a quincunx matrix mode, retreating type grouting is still adopted in the process of lifting a drill rod after grouting at the bottom of the waste water pump room 4, and cement and water glass double-liquid grout is injected into an excavation soil body. The in-process that promotes at the drilling rod adopts retreating formula slip casting, can reduce the time that injected hole 41 exposes, reduces the risk of gushing water and gushing sand, simultaneously, can make the sand and soil in 4 hole bottoms of waste water pump house have good erectility and stability.
S10, referring to fig. 2 and 3, uniformly arranging inspection holes on the grout stop wall 5 and the bottom of the waste water pump house 4, sampling by adopting a drilling coring method, and grouting and backfilling the inspection holes by adopting the same deep hole grouting mode after coring.
The implementation principle of the construction method of the water-rich sand layer wastewater pump house in the embodiment of the application is as follows: and (3) measuring and determining the central position of the shaft 1 at a construction site by using a level gauge and a theodolite according to a construction drawing, and paying off and positioning.
And (3) dewatering the excavation part of the vertical shaft 1 to soften the soil body 30 days in advance, excavating a foundation pit of the vertical shaft 1 30 days later, and constructing a locking ring 11 of the vertical shaft 1 and an upper short wall 12 of the vertical shaft 1 at the periphery of the well head before excavating the foundation pit of the vertical shaft 1. And (3) directly excavating a vertical shaft 1 in a position 3m below the ground by adopting an excavator, excavating the vertical shaft 1 manually below 3m, and vertically lifting the earthwork of the excavated vertical shaft 1 by using a gantry crane grab bucket.
After the shaft 1 is excavated, the size of the excavation section of the shaft 1 is checked, dangerous stones and rock debris at the wall bottom are removed, when water gushing, water drenching and concentrated water outlet points exist on the sprayed surface, drainage treatment is firstly carried out, dust and sundries on the excavated surface are cleaned up by water or wind, and concrete is sprayed in time after primary support forming.
The concrete is sprayed by a wet spraying process, a wet sprayer is used for spraying the concrete once to cover the steel net rack, the spraying operation is segmented, sliced and layered, the spraying operation is sequentially carried out from bottom to top, and the concrete is sprayed and filled first at a position with a larger concave. The construction quality and the size precision of the vertical shaft 1 can be improved by filling the large concave position by spraying first, and the spraying operation is performed sequentially by segmentation, fragmentation, layering and from bottom to top.
The concrete is doped with the additive with the doping amount of 5-10 percent, and after the additive is added, the mixture is uniformly stirred in a wet spraying machine by using an external stirrer.
When spraying, the admixture is firstly opened, then air is opened, and then the material is fed, so that a nozzle of the wet spraying machine is always vertical to the rock surface, the surface of a sprayed layer is flat and smooth, the phenomenon of dry spots or slip and flow is reduced, and the construction accuracy of the shaft wall of the vertical shaft 1 is achieved by easy adhesion, small resilience and moist and glossy surface. And after the construction of the circumferential side wall of the vertical shaft 1 is finished, pouring concrete back cover at the bottom of the vertical shaft 1.
The connection channel 2 and the tunnel 3 are horizontally excavated near the bottom of the vertical shaft 1 on the circumferential inner wall of the vertical shaft 1, and simultaneously and sequentially used as a primary lining, a secondary lining and a waterproof layer of the connection channel 2 and the tunnel 3, wherein the connection channel 2 is communicated with the tunnel 3 and the vertical shaft 1.
And excavating the waste water pump room 4 in the middle of the communication channel 2 by adopting a manual excavation mode to form a foundation pit of the waste water pump room 4. At least two layers of steel bar net pieces 52 are fixedly connected to the surface of a foundation pit soil body of a waste water pump house 4, C30 concrete is sprayed to construct a grout stopping wall 5, a mounting opening 51 facing the interior of the waste water pump house 4 is reserved in the construction of the grout stopping wall 5, a thin steel plate 61 and a one-way valve 6 are fixedly connected in the mounting opening 51 through an expansion bolt 62, the one-way valve 6 penetrates through the grout stopping wall 5 and is embedded into the soil body, and concrete is poured to seal the mounting opening 51 and expose a liquid injection opening of the one-way valve 6 after the one-way valve 6 is installed. If the water gushing and sand gushing are generated, chemical slurry is directly injected into the soil body through the one-way valve 6 to control the water gushing and sand gushing condition for the need from time to time.
And (3) performing hole forming operation after the concrete strength of the grout stopping wall 5 reaches 85% of the design strength, and directly drilling into the soil body near the grout stopping wall 5 to perform hole forming operation after the angle of a drilling machine is adjusted. A small-sized tunnel drilling machine is adopted to drill a single row of holes at the periphery of the grout stopping wall 5, the hole forming construction sequence is one-to-one, an assembled drilling rod is adopted as a drilling machine drilling rod, and chemical grout is injected simultaneously in the hole forming process.
And immediately driving the perforated pipes 7 into the holes after the holes are formed, wherein the construction sequence is that every two perforated pipes 7 are arranged at intervals, the perforated pipes 7 are inserted below the excavation surface, the perforated pipes 7 positioned at the four corners of the waste water pump room 4 are inclined towards the direction far away from the waste water pump room 4, and the range of the external insertion angle is 10-20 degrees. The hard rubber ring 71 can reduce the risk of slurry leakage, slurry overflow and the like in the grouting process of the perforated pipe 7. And finally, carrying out deep hole grouting construction through the perforated pipe 7, wherein the grout adopts cement and water glass double-liquid grout.
The method comprises the steps of vertically drilling into the position below an excavation surface at the bottom of a waste water pump room 4 by using a tunnel drilling machine to carry out deep hole grouting construction, stopping water by using chemical grout in a pore-forming process, arranging all grouting holes 41 at the bottom of the waste water pump room 4 in a quincunx shape, after grouting at the bottom of the waste water pump room 4, adopting retreating type grouting in a drilling rod lifting process, and injecting cement and water glass double-liquid grout into an excavation soil body.
And (3) uniformly arranging inspection holes on the grout stop wall 5 and the bottom of the waste water pump house 4, sampling by adopting a drilling coring method, and grouting and backfilling the inspection holes by adopting the same deep hole grouting mode after coring.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A construction method of a water-rich sand layer wastewater pump house is characterized by comprising the following steps: the method comprises the following steps:
s1, measuring and setting line, and positioning the well;
s2, excavating a well: excavating within 3m below the ground by adopting an excavator directly, excavating manually below 3m, vertically lifting the earthwork by using a gantry crane grab bucket, and immediately hanging a steel net rack and spraying concrete after the excavation is finished;
s3, shaft (1) back cover: after the construction of the side wall of the vertical shaft (1) is finished, constructing bottom sealing concrete;
s4, construction connecting channel (2) and tunnel (3): excavating the communication channel (2) and the tunnel (3), and simultaneously constructing a primary lining, a secondary lining and a waterproof layer of the communication channel (2) and the tunnel (3);
s5, excavating a foundation pit of the waste water pump house (4): excavating a waste water pump room (4) in the middle of the communication channel (2) in a manual excavation mode;
s6, constructing a grout stopping wall (5): constructing a grout stopping wall (5) on the surface of an excavated soil body of the waste water pump room (4), wherein the grout stopping wall (5) is made of C30 concrete, at least two layers of reinforcing steel bar net sheets (52) are embedded in the grout stopping wall (5), and a one-way valve (6) penetrating through the grout stopping wall (5) is fixedly installed in the grout stopping wall (5);
s7, hole forming construction; a small-sized underground drill rig is adopted to drill holes on the periphery of the grout stopping wall (5), an assembled drill rod is adopted as a drill rod of the drill rig, and chemical grout is injected simultaneously in the hole forming process;
s8, construction of a perforated pipe (7): the periphery of the waste water pump room (4) is provided with single-row perforated pipes (7), the perforated pipes (7) are immediately driven into the holes after the holes are formed in S7, the construction sequence is that every two perforated pipes are arranged, the perforated pipes (7) are inserted into the positions below the excavated surface, the range of the external insertion angles of the perforated pipes (7) positioned at the four corners of the waste water pump room (4) is 10-20 degrees, grouting construction is carried out after the perforated pipes (7) are driven into the holes, and slurry adopts cement and water glass two-liquid slurry;
s9, deep hole grouting construction: all grouting holes (41) are arranged at the bottom of the waste water pump house (4) in a quincunx shape, a tunnel drilling machine is adopted to vertically drill into the position below an excavation surface at the bottom of the waste water pump house (4), chemical grout is adopted to stop water in the hole forming process, and a retreat grouting method is adopted to inject cement and water glass double-liquid grout after the hole is drilled to a designed elevation;
s10, grouting effect detection: the method is characterized in that the grout stop wall (5) and the bottom of the waste water pump room (4) are uniformly provided with inspection holes, a drilling coring method is adopted for sampling, and the inspection holes are subjected to grouting backfill in the same deep hole grouting mode after coring.
2. The construction method of the water-rich sand layer wastewater pump house according to claim 1, characterized in that: in step S2, the water is lowered 30 days in advance, then the foundation pit of the vertical shaft (1) is excavated, and before the foundation pit of the vertical shaft (1) is excavated, the locking ring (11) of the vertical shaft (1) and the upper short wall (12) thereof are constructed on the periphery of the well head.
3. The construction method of the water-rich sand layer wastewater pump house according to claim 1, characterized in that: in step S2, before spraying concrete, checking the size of the cut surface of the excavation, removing dangerous stones and rock debris at the wall bottom, when there are gushing water, drenching water and concentrated water outlet points on the sprayed surface, conducting drainage treatment first, cleaning up the dust and debris on the excavated surface with water or wind, spraying and protecting in time after the initial support forming, spraying concrete by wet spraying process, covering the steel net rack with one-time sprayed concrete by wet spraying machine, when spraying, firstly spraying admixture, then blowing air, then feeding material, based on easy adhesion, small resilience and wet surface gloss.
4. The construction method of the water-rich sand layer wastewater pump house according to claim 3, characterized in that: in step S2, the nozzle of the wet blasting machine is always perpendicular to the rock face.
5. The construction method of the water-rich sand layer wastewater pump house according to claim 3, characterized in that: in step S2, the injection operation is performed in stages, divided into pieces, and layered sequentially from bottom to top, with large depressions, and the injection is performed first.
6. The construction method of the water-rich sand layer wastewater pump house according to claim 3, characterized in that: in step S2, the admixture accounts for 5% -10%, after the admixture is added, the admixture is stirred evenly in the wet spraying machine, when the concrete is sprayed, the surface of the sprayed layer is smooth, and the phenomenon of dry spots or slip flow is reduced.
7. The construction method of the water-rich sand layer wastewater pump house according to claim 1, characterized in that: in the step S6, a mounting opening (51) is reserved when the grout stop wall (5) is constructed, a thin steel plate (61) is fixedly connected in the mounting opening (51) through an expansion bolt (62), a check valve (6) penetrates through the thin steel plate (61) and is fixedly connected with the thin steel plate (61), the check valve (6) penetrates through the grout stop wall (5) and is embedded into soil, and after the check valve (6) is mounted, concrete is poured to seal and fill the mounting opening (51) and expose a liquid injection opening of the check valve (6).
8. The construction method of the water-rich sand layer wastewater pump house according to claim 1, characterized in that: in step S7, the hole forming operation can be performed after the concrete strength of the grout stopping wall (5) reaches 85% of the design strength in the hole forming construction, and the drilling machine directly drills into the soil body near the grout stopping wall (5) to perform the hole forming operation after the angle is adjusted.
9. The construction method of the water-rich sand layer wastewater pump house according to claim 1, characterized in that: in step S8, a hard rubber ring (71) is filled in a gap between the floral tube (7) and the soil body, and a steel sleeve (72) is driven to tightly squeeze the hard rubber ring (71).
10. The construction method of the water-rich sand layer wastewater pump house according to claim 1, characterized in that: in step S9, after the grouting of the bottom of the waste water pump house (4) is completed, the retreating type grouting is still adopted in the process of lifting the drill rod, and cement and water glass double-liquid slurry is injected into the excavated soil body.
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