CN113175350B - 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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- CN113175350B CN113175350B CN202110414675.0A CN202110414675A CN113175350B CN 113175350 B CN113175350 B CN 113175350B CN 202110414675 A CN202110414675 A CN 202110414675A CN 113175350 B CN113175350 B CN 113175350B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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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Abstract
The application relates to the technical field of subway section wastewater pump rooms, in particular to a water-rich sand layer wastewater pump room construction method, which comprises the following steps: s1, measuring paying-off and well positioning; s2, excavating a well body; s3, shaft bottom sealing; s4, constructing a connecting channel and a tunnel; s5, excavating a waste water pump house foundation pit; s6, construction of a grout stopping wall: a slurry stopping wall is arranged on the surface of the excavated soil body of the wastewater pump room, and a one-way valve penetrating through the slurry stopping wall is fixedly arranged in the slurry stopping wall; s7, pore-forming construction; drilling holes on the periphery of the grout stopping wall; s8, construction of a flower pipe: immediately driving the flower pipe after the hole forming is finished in S7; s9, deep hole grouting construction: the grouting holes are arranged at the bottom of the wastewater pump room in a plum blossom shape; s10, grouting effect detection: the application has the effects of reducing the possibility of water and sand surge accidents in the construction process of the wastewater pump house and reducing the risk of foundation instability by adopting a drilling coring method for sampling.
Description
Technical Field
The application relates to the technical field of subway section wastewater pump rooms, in particular to a construction method of a water-rich sand layer wastewater pump room.
Background
In order to collect the water leakage and fire-fighting waste water in the subway section tunnel, a waste water pump house is arranged at the lowest point of the section tunnel, and the waste water pump house mainly comprises a water collecting tank, a drainage pump and a pressure drainage pipeline.
The common subway section waste water pump house adopts a mode of being built together with a connecting channel, namely digging and arranging below the connecting channel, then constructing a reinforced concrete bottom plate and a side wall, and discharging waste water from a ballast bed drainage ditch to a water collecting tank through an embedded steel pipe and then through a drainage pump.
With respect to the related art in the above, the inventors consider that there are the following drawbacks: for the wastewater pump house in the subway section, because the wastewater of two subway section tunnels is discharged into the wastewater pump house, the volume requirement of the wastewater pump house is larger, the corresponding excavation range and depth are also larger, the construction layer is positioned in the underground water-rich sand layer, water and sand surge accidents easily occur in the construction process, and the foundation instability risk is high.
Disclosure of Invention
The application provides a construction method of a water-rich sand layer wastewater pump house, which aims to reduce the possibility of unexpected water and sand gushing in the construction process of the wastewater pump house and reduce the risk of foundation instability.
The application provides a construction method of a water-rich sand layer wastewater pump house, which adopts the following technical scheme: the construction method of the water-rich sand layer wastewater pump house comprises the following steps:
s1, measuring paying-off and well positioning;
s2, well body excavation: directly excavating by adopting an excavator in the position 3m below the ground, manually excavating soil in the position 3m below the ground, vertically lifting earthwork by adopting a gantry crane grab bucket, immediately hanging a steel net frame after the excavation is completed, and spraying concrete;
s3, shaft back cover: after the construction of the side wall of the vertical shaft is finished, constructing bottom-sealing concrete;
s4, constructing a communication channel and a tunnel: excavating a connecting channel and a tunnel, and simultaneously performing a primary lining, a secondary lining and a waterproof layer of the connecting channel and the tunnel;
s5, excavating a waste water pump house foundation pit: excavating a waste water pump room in the middle of the connecting channel by adopting a manual excavation mode;
s6, construction of a grout stopping wall: applying a slurry stopping wall on the surface of the excavated soil body of the wastewater pump house, wherein the slurry stopping wall is made of C30 concrete, at least two layers of reinforcing steel meshes are embedded in the slurry stopping wall, and a one-way valve penetrating through the slurry stopping wall is fixedly arranged in the slurry stopping wall;
s7, pore-forming construction; drilling holes on the periphery of the grout stopping wall by adopting a small tunnel drilling machine, and simultaneously injecting chemical grout in the hole forming process by adopting an assembled drilling rod by adopting a drilling rod of the drilling machine;
s8, construction of a flower pipe: the periphery of the waste water pump room is provided with a single row of flower pipes, the flower pipes are immediately driven into the holes after the hole forming is finished in the step S7, the construction sequence is that the flower pipes are arranged at intervals, the flower pipes are inserted below the excavation surface, the external insertion angles of the flower pipes positioned at the four corners of the waste water pump room are in the range of 10-20 ℃, grouting construction is carried out after the flower pipes are driven into, and cement and water glass double-liquid slurry is adopted as slurry;
s9, deep hole grouting construction: all grouting holes are arranged at the bottom of the waste water pump room in a quincuncial shape, a tunnel drilling machine is adopted to vertically drill into the bottom of the waste water pump room below the excavation surface, chemical slurry water stop is adopted in the pore-forming process, a back-off grouting method is adopted after the drilling process reaches the designed elevation, and cement and water glass double-liquid slurry is injected;
s10, grouting effect detection: and the slurry stopping wall and the bottom of the wastewater pump room are uniformly provided with inspection holes, a drilling and coring method is adopted for sampling, and the inspection holes are subjected to grouting backfill in the same deep hole grouting mode after coring.
Through adopting above-mentioned technical scheme, when well bore excavated, adopt excavator excavation and manual work to excavate and use the mode of portal crane grab bucket vertical lift earthwork, can carry out the construction of shaft excavation effectively, the shaft excavation is accomplished the back and is hung steel rack immediately and spout the risk that the concrete can reduce gushing water gushing sand, improves the construction safety and the construction quality of vertical well. The slurry stopping wall is used as a structural wall of the wastewater pump room, so that the risk of water and sand gushing of soil can be reduced, and at least two layers of reinforcing steel meshes are embedded in the slurry stopping wall to strengthen the structural strength of the slurry stopping wall; in the construction process, if water and sand gushing occurs, chemical slurry can be directly injected into the soil body through the one-way valve to control the water and sand gushing so as to be needed 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 is efficiently carried out; because the communication channel is positioned in the water-rich sand layer, chemical slurry is injected simultaneously in the pore-forming process, and the risk of water and sand gushing can be greatly reduced. The pattern pipe is driven in a spaced-apart mode, so that the concentrated stress of construction can be reduced, and the soil body is stable; the flower pipes at four corners of the waste water pump room are inclined to be driven in the direction away from the waste water pump room, the external insertion angle of the flower pipes is 10-20 degrees, and the grouting wall can be further reinforced after deep hole grouting of the flower pipes, so that the risk of water and sand gushing is further reduced. All grouting holes are arranged at the bottom of the waste water pump room in a quincuncial shape, so that 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 back-off grouting method is adopted, so that the exposure time of the hole wall of a grouting hole can be reduced, and the risk of water and sand gushing is reduced.
Optionally, in step S2, dewatering is performed for 30 days in advance, then a shaft foundation pit is excavated, and before the shaft foundation pit is excavated, a shaft lock ring and a wall with a short wall are firstly applied to the periphery of a wellhead.
By adopting the technical scheme, the soil at the vertical shaft can be softened by 30 days of precipitation in advance, so that the vertical shaft can be excavated; before the shaft foundation pit is excavated, a shaft lock ring and an upper short wall are arranged on the periphery of a wellhead to serve as reference objects of the shaft center, so that the shaft center can be positioned in real time, soil around the shaft can be reinforced by the lock ring and the upper short wall, soil collapse is avoided, and smooth construction of shaft excavation is ensured.
Optionally, in step S2, before spraying concrete, the size of the excavated section is checked, dangerous stones and the rock residues of the basement are removed, when the sprayed surface has water burst, water spraying and concentrated water outlet points, drainage treatment is firstly carried out, dust and sundries on the excavated surface are cleaned by water or wind, the preliminary support is formed and then sprayed and protected in time, the sprayed concrete adopts a wet spraying process, a wet spraying machine is adopted to spray the concrete once to cover the steel net frame, and when spraying, an additive is firstly started, then wind is started, then feeding is carried out, and the steel net frame is easy to adhere, small in rebound quantity and wet and glossy on the surface.
By adopting the technical scheme, the construction quality of sprayed concrete can be improved by removing the dangerous stones and the rock residues of the basement; the wet spraying method can improve the construction quality of the shaft wall, the additive is added into the concrete to improve the adhesiveness of the concrete, the strength of the shaft wall can be improved after the concrete is solidified, the rebound quantity of the shaft wall is reduced, and the surface gloss of the shaft wall is improved.
Optionally, in step S2, the nozzle is always perpendicular to the rock face.
By adopting the technical scheme, the nozzle and the rock surface are always kept vertical, so that the concrete sprayed by the nozzle can be uniformly sprayed on the soil surface of the shaft wall of the shaft, and the construction quality and the dimensional accuracy of the shaft are improved.
Optionally, in step S2, the spraying operation is performed sequentially from bottom to top, with larger depressions, and then spraying and filling.
By adopting the technical scheme, the construction quality and the dimensional accuracy of the vertical shaft can be improved by firstly spraying and filling up the larger concave position, and because 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, the spraying operation is carried out in sequence from top to bottom by adopting sections, fragments and layers, so that the fluidity of the concrete can be utilized, the waste of the concrete is reduced, the consumption of the concrete is saved, and the construction cost is reduced.
Optionally, in step S2, the mixing amount of the additive ranges from 5% to 10%, after the additive is added, the mixture is stirred uniformly in a wet spraying machine, and when concrete is sprayed, the surface of the sprayed layer is smooth and slippery, and dry spots or slipping are reduced.
By adopting the technical scheme, a large amount of practical construction experience is summarized, so that the mixing amount of the additive is 5% -10% in the range of the mixing ratio, and each performance of the concrete can reach a better degree; the admixture and the concrete are uniformly stirred in the wet spraying machine, so that the consistency of the overall performance of the concrete can be improved, the construction quality of a vertical shaft is improved, the surface of a spraying layer is smoother and smoother, and the occurrence of dry spots or slipping and flowing phenomena is reduced.
Optionally, in step S6, an installation opening is reserved during construction of the grout stop wall, a thin steel plate is fixedly connected in the installation opening through an expansion bolt, the one-way valve penetrates through the thin steel plate and is fixedly connected with the thin steel plate, the one-way valve penetrates through the grout stop wall and is embedded into soil, and after the one-way valve is installed, concrete is poured to seal the installation opening and expose a liquid injection opening of the one-way valve.
By adopting the technical scheme, the mounting opening 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 stopping wall, the mounting firmness of the one-way valve can be further reinforced by pouring concrete to seal the mounting opening after the one-way valve is mounted, the integrity of the grout stopping wall can be maintained, and the strength of the grout stopping wall is improved; if water and sand gushing occurs, chemical slurry is directly injected into the soil body through the one-way valve to control the water and sand gushing condition so as to be needed from time to time.
Optionally, in step S7, the hole forming operation may be performed after the strength of the concrete of the grout stop wall reaches 85% of the design strength, and the drilling machine directly drills into the soil body near the grout stop wall to perform the hole forming operation after adjusting the angle.
Through adopting above-mentioned technical scheme, the grout stop wall concrete strength reaches 85% of design intensity after, and the grout stop wall reaches higher hardness and intensity, and the rig directly bores the soil body near the grout stop wall and carries out the pore-forming operation in this moment can not produce the influence to the grout stop wall.
Optionally, in step S8, the gap between the flower pipe and the soil body is filled with a hard rubber ring and is driven into a steel sleeve to tightly press the hard rubber ring.
By adopting the technical scheme, the steel sleeve can squeeze the hard rubber ring, so that the hard rubber ring stably seals the bottom peripheral area of the flower pipe; the hard rubber ring can reduce the risk of slurry leakage, slurry overflow and other conditions of the pipe in the grouting process.
Optionally, in step S9, after grouting of the pit bottom of the wastewater pump house is completed, back grouting is still adopted in the process of lifting the drill rod, and cement and water glass dual-liquid slurry is injected into the excavated soil body.
Through adopting above-mentioned technical scheme, adopt the slip casting of back formula at the in-process that the drilling rod promoted, can reduce the time that the slip casting hole was exposed, reduce the risk of gushing water and gushing sand, simultaneously, can make the sandy soil in the waste water pump house hole bottom have good upright nature and stability.
In summary, the present application includes at least one of the following beneficial technical effects:
1. by arranging the slurry stopping wall, the slurry stopping wall is used as a structural wall body of the wastewater pump house, the risk of water and sand gushing of soil body can be reduced, and at least two layers of reinforcing steel meshes are embedded in the slurry stopping wall to strengthen the structural strength of the slurry stopping wall;
2. by arranging the one-way valve, if water and sand gushing occurs in the construction process, chemical slurry can be directly injected into the soil body through the one-way valve to control the water and sand gushing so as to be needed from time to time;
3. through set up single row's floral tube around the waste water pump house, can further consolidate the grout stopping wall after floral tube deep hole slip casting, further reduce the risk that gushes out water and gushes out sand.
Drawings
FIG. 1 is a schematic 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 of a mesh sheet embodying reinforcing bars;
FIG. 3 is a schematic diagram of a structure embodying a floral tube;
fig. 4 is a schematic diagram showing the structure of a grouting hole.
Reference numerals illustrate: 1. a shaft; 11. locking ring; 12. mounting a short wall; 2. a communication channel; 3. a tunnel; 4. a waste water pump house; 41. grouting holes; 5. a grout stopping wall; 51. a mounting port; 52. reinforcing steel bar meshes; 6. a one-way valve; 61. a thin steel plate; 62. an expansion bolt; 7. a flower tube; 71. a hard rubber ring; 72. a steel sleeve.
Detailed Description
The application is described in further detail below with reference to fig. 1-4.
The embodiment of the application discloses a construction method of a water-rich sand layer wastewater pump house, which comprises the following steps:
s1, referring to FIG. 1, measuring and determining the center position of a vertical shaft 1 on a construction site by using a level gauge and a theodolite according to a construction drawing, and paying off and positioning.
S2, referring to FIG. 1, dewatering is carried out at the excavation position of the vertical shaft 1 for 30 days in advance to soften soil, a foundation pit of the vertical shaft 1 is excavated after 30 days, and a locking ring 11 of the vertical shaft 1 and an upper dwarf wall 12 are firstly arranged on the periphery of a wellhead before the foundation pit of the vertical shaft 1 is excavated.
Referring to fig. 1, a vertical shaft 1 is excavated by an excavator directly in 3m below the ground, a vertical shaft 1 is excavated by a manual work in 3m below the ground, a gantry crane is fixedly arranged above the wellhead of the vertical shaft 1, a grab bucket of the gantry crane vertically lifts the excavated vertical shaft 1 earthwork, and a steel grid is hung on the surface of the soil body of the vertical shaft 1 immediately after the excavation of the vertical shaft 1 is completed and concrete is sprayed.
Referring to fig. 1, after the excavation of the vertical shaft 1 is completed, before concrete is sprayed to the surface of the wall of the vertical shaft 1, the excavation section size of the vertical shaft 1 is checked, rock fragments of dangerous stones and wall bottoms are removed, when water gushes, 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 after primary support forming, the protection is timely carried out.
Referring to fig. 1, the concrete is sprayed by a wet spraying process, a wet spraying machine is adopted to spray the concrete once to cover the steel net frame, spraying operation is performed in sections, in sections and in layers from bottom to top, larger concave parts are formed, and spraying and filling are performed first. The construction quality and the dimensional accuracy of the vertical shaft 1 can be improved by firstly spraying and filling up larger depressions, and the concrete sprayed on the surface of the well wall soil body inevitably flows to the bottom direction under the action of gravity.
Referring to fig. 1, the admixture is mixed in the concrete, the mixing amount of the admixture is 5% -10%, after the admixture is added, the admixture is uniformly stirred in the wet spraying machine by using an external stirrer, and the admixture and the concrete are uniformly stirred in the wet spraying machine, so that the consistency of the overall performance of the concrete can be improved, and the construction quality of the vertical shaft 1 can be improved. When spraying, firstly opening the additive, then opening the air, and then feeding, so that the nozzle of the wet spraying machine is always vertical to the rock surface, the surface of the sprayed layer is smooth and smooth, and the phenomenon of dry spots or sliding flow is reduced, so that the construction surface of the vertical shaft 1 is accurate in terms of easy adhesion, small rebound quantity and surface wetting gloss.
S3, referring to FIG. 1, after the construction of the circumferential side wall of the vertical shaft 1 is completed, pouring concrete back covers to the bottom of the vertical shaft 1.
S4, referring to FIG. 1, a connecting channel 2 and a tunnel 3 are excavated horizontally on the circumferential inner wall of the vertical shaft 1 near the bottom of the vertical shaft 1, and the connecting channel 2 and the tunnel 3 are sequentially used as a primary lining, a secondary lining and a waterproof layer at the same time, and the connecting channel 2 is communicated with the tunnel 3 and the vertical shaft 1.
S5, referring to fig. 1 and 2, excavating a waste water pump house 4 in the middle of the connecting channel 2 in a manual excavation mode to form a waste water pump house 4 foundation pit.
S6, referring to fig. 2 and 3, at least two layers of reinforcing steel meshes 52 are fixedly connected to the surface of a foundation pit soil body of the wastewater pump house 4, then C30 concrete is sprayed to form a grout stopping wall 5, and the reinforcing steel meshes 52 are used as a framework of the grout stopping wall 5 to strengthen the structural strength of the grout stopping wall 5.
Referring to fig. 2 and 3, when the grout stop wall 5 is constructed, an installation opening 51 facing the interior of the wastewater pump room 4 is reserved, a thin steel plate 61 is fixedly connected in the installation opening 51 through an expansion bolt 62, the thin steel plate 61 is fixedly penetrated by a one-way valve 6, the one-way valve 6 penetrates through the grout stop wall 5 and is embedded into soil, and after the one-way valve 6 is installed, concrete is poured to seal the installation opening 51 and expose a liquid injection opening of the one-way valve 6. If water and sand gushing occurs, chemical slurry is directly injected into the soil body through the one-way valve 6 to control the water and sand gushing condition so as to be needed from time to time.
S7, referring to fig. 2 and 3, after the concrete strength of the grout stop wall 5 reaches 85% of the design strength, hole forming operation is carried out, and after the drilling machine is adjusted to an angle, hole forming operation is carried out by directly drilling the soil body near the grout stop wall 5. After the concrete strength of the grout stop wall 5 reaches 85% of the design strength, the grout stop wall 5 reaches higher hardness and strength, and at the moment, the drilling machine directly drills into the soil near the grout stop wall 5 to perform hole forming operation, so that the grout stop wall 5 cannot be affected.
Referring to fig. 2 and 3, a small tunnel drilling machine is adopted to drill single row holes at the periphery of the grout stop wall 5, the hole forming construction sequence is divided into a first group, the drilling machine drill rods are assembled drill rods, chemical grout is injected simultaneously in the hole forming process, and the risk of water and sand gushing in the hole forming construction process can be greatly reduced.
S8, referring to fig. 3 and 4, a single row of flower pipes 7 are inserted into soil around the waste water pump house 4, a plurality of grouting holes 41 are formed in the flower pipes 7, the flower pipes 7 are driven into the holes immediately after the hole forming is finished, the construction sequence is a dozen, the flower pipes 7 are inserted below the excavation surface, the flower pipes 7 positioned at four corners of the waste water pump house 4 incline towards a direction away from the waste water pump house 4, and the external insertion angle range is 10-20 degrees. The gap between the flower pipe 7 and the soil body is filled with the hard rubber ring 71 and is driven into the steel sleeve 72 to squeeze the hard rubber ring 71, the steel sleeve 72 can squeeze the hard rubber ring 71, the hard rubber ring 71 can stably seal the bottom peripheral area of the flower pipe 7, and the hard rubber ring 71 can reduce the risks of slurry leakage, slurry overflow and other conditions of the flower pipe 7 in the grouting process. Finally, deep hole grouting construction is carried out through the pipe 7, and cement and water glass double-liquid slurry is adopted as slurry.
Referring to fig. 3 and 4, after deep hole grouting through the perforated pipe 7, the grouting stopping wall 5 can be further reinforced, and the risk of water and sand gushing of the wastewater pump house 4 is further reduced.
S9, referring to fig. 3 and 4, a tunnel drilling machine is adopted to vertically drill into the bottom of the wastewater pump room 4 below the excavation surface to perform deep hole grouting construction, chemical slurry water is adopted in the pore-forming process, all grouting holes 41 are arranged at the bottom of the wastewater pump room 4 in a quincuncial matrix, after grouting of the bottom of the wastewater pump room 4 is completed, back-type grouting is still adopted in the lifting process of a drill rod, and cement and water glass double-liquid slurry is injected into an excavation soil body. Adopt the back formula slip casting at the in-process that the drilling rod promoted, can reduce the time that grouting hole 41 was exposed, reduce the risk that gushes water and gushes out sand, simultaneously, can make the sand in the 4 hole bottoms of waste water pump house have good upright nature and stability.
S10, referring to fig. 2 and 3, inspection holes are uniformly formed in the slurry stopping wall 5 and the bottom of the wastewater pump room 4, sampling is performed by a drilling coring method, and grouting backfilling is performed on the inspection holes by adopting the same deep hole grouting mode after coring.
The implementation principle of the water-rich sand layer wastewater pump house construction method provided by the embodiment of the application is as follows: and measuring and determining the central position of the vertical shaft 1 on a construction site by using a level gauge and a theodolite according to a construction drawing, and paying off and positioning.
Dewatering is carried out at the excavation position of the vertical shaft 1 for 30 days in advance to soften soil, a foundation pit of the vertical shaft 1 is excavated after 30 days, and a locking ring 11 of the vertical shaft 1 and an upper dwarf wall 12 are firstly arranged at the periphery of a wellhead before the foundation pit of the vertical shaft 1 is excavated. The vertical shaft 1 is directly excavated by an excavator in the position 3m below the ground, the vertical shaft 1 is excavated by a manual work in the position 3m below the ground, and the vertical shaft 1 earthwork is lifted by a gantry crane grab bucket.
After the excavation of the vertical shaft 1 is finished, the excavation section size of the vertical shaft 1 is checked, rock residues of dangerous stones and wall bottoms are removed, when water gushes, water drenching and concentrated water outlet points are arranged 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 preliminary support forming.
The concrete spraying process includes spraying concrete to cover the steel net frame with one-step wet spraying machine, and the spraying operation includes the steps of sectioning, slicing and layering sequentially from bottom to top. The construction quality and the dimensional accuracy of the vertical shaft 1 can be improved by firstly spraying and filling up the larger concave parts, and the spraying operation is sequentially performed from bottom to top by adopting segmentation, slicing and layering.
And (3) adding an additive with the mixing amount accounting for 5-10% of the mixing ratio into the concrete, and uniformly stirring in a wet spraying machine by using an external stirrer after the additive is added.
When spraying, firstly opening the additive, then opening the air, and then feeding, so that the nozzle of the wet spraying machine is always vertical to the rock surface, the surface of the sprayed layer is smooth and smooth, and the phenomenon of dry spots or sliding flow is reduced, so that the construction surface of the vertical shaft 1 is accurate in terms of easy adhesion, small rebound quantity and surface wetting gloss. And after the construction of the circumferential side wall of the vertical shaft 1 is finished, pouring concrete back covers at the bottom of the vertical shaft 1.
The connecting channel 2 and the tunnel 3 are horizontally excavated at the position close to the bottom of the vertical shaft 1 on the circumferential inner wall of the vertical shaft 1, and the connecting channel 2 and the primary lining, the secondary lining and the waterproof layer of the tunnel 3 are sequentially arranged at the same time, and the connecting channel 2 is communicated with the tunnel 3 and the vertical shaft 1.
And excavating a waste water pump house 4 in the middle of the connecting channel 2 by adopting a manual excavation mode to form a waste water pump house 4 foundation pit. At least two layers of reinforcing steel meshes 52 are fixedly connected to the surface of a foundation pit soil body of the wastewater pump room 4, then C30 concrete is sprayed to form a grout stopping wall 5, an installation opening 51 facing the interior of the wastewater pump room 4 is reserved during construction of the grout stopping wall 5, a thin steel plate 61 and a one-way valve 6 are fixedly connected in the installation opening 51 through expansion bolts 62, the one-way valve 6 penetrates through the grout stopping wall 5 and is embedded into the soil body, and after the one-way valve 6 is installed, the concrete is poured to seal the installation opening 51 and expose a liquid filling opening of the one-way valve 6. If water and sand gushing occurs, chemical slurry is directly injected into the soil body through the one-way valve 6 to control the water and sand gushing condition so as to be needed from time to time.
And (3) performing pore-forming operation after the concrete strength of the grout stop wall 5 reaches 85% of the design strength, and performing pore-forming operation by directly drilling the soil body near the grout stop wall 5 after the drilling machine adjusts the angle. A small tunnel drilling machine is adopted to drill single row holes at the periphery of the grout stop wall 5, the hole forming construction sequence is divided into a dozen times, a drilling machine drill rod adopts an assembled drill rod, and chemical grout is injected simultaneously in the hole forming process.
Immediately after the hole forming is finished, the flower pipes 7 are driven into the hole, the construction sequence is that the flower pipes 7 are arranged in a staggered mode, the flower pipes 7 are inserted below the excavation surface, the flower pipes 7 positioned at four corners of the waste water pump room 4 incline towards the direction away from the waste water pump room 4, and 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 of the pipe 7 in the grouting process. Finally, deep hole grouting construction is carried out through the pipe 7, and cement and water glass double-liquid slurry is adopted as slurry.
Deep hole grouting construction is carried out by vertically drilling a tunnel drilling machine below the excavation surface at the bottom of the wastewater pump room 4, chemical slurry water stop is adopted in the pore forming process, all grouting holes 41 are arranged at the bottom of the wastewater pump room 4 in a quincuncial shape, after grouting at the bottom of the wastewater pump room 4 pit is completed, back-type grouting is still adopted in the process of lifting a drill rod, and cement and water glass double-liquid slurry is injected into an excavation soil body.
And the slurry stopping wall 5 and the bottom of the wastewater pump room 4 are uniformly provided with inspection holes, a drilling and coring method is adopted for sampling, and the inspection holes are subjected to grouting backfill in the same deep hole grouting mode after coring.
The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (8)
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 paying-off and well positioning;
s2, well body excavation: directly excavating by adopting an excavator in the position 3m below the ground, manually excavating soil in the position 3m below the ground, vertically lifting earthwork by adopting a gantry crane grab bucket, immediately hanging a steel net frame after the excavation is completed, and spraying concrete;
s3, sealing the bottom of the vertical shaft (1): after the construction of the side wall of the vertical shaft (1) is finished, constructing bottom-sealing concrete;
s4, constructing a connecting channel (2) and a tunnel (3): excavating a connecting channel (2) and a tunnel (3), and simultaneously applying a primary lining, a secondary lining and a waterproof layer of the connecting channel (2) and the tunnel (3);
s5, excavating a foundation pit of a waste water pump house (4): a wastewater pump room (4) is excavated in the middle of the connecting channel (2) by adopting a manual excavation mode;
s6, construction of a grout stopping wall (5): a slurry stopping wall (5) is arranged on the surface of an excavated soil body of the wastewater pump room (4), the slurry stopping wall (5) is made of C30 concrete, at least two layers of reinforcing steel meshes (52) are embedded in the slurry stopping wall (5), and a one-way valve (6) penetrating through the slurry stopping wall (5) is fixedly arranged in the slurry stopping wall (5); in the step S6, a mounting opening (51) is reserved when the grout stopping wall (5) is constructed, a thin steel plate (61) is fixedly connected in the mounting opening (51) through an expansion bolt (62), a one-way valve (6) penetrates through the thin steel plate (61) and is fixedly connected with the thin steel plate (61), the one-way valve (6) penetrates through the grout stopping wall (5) and is embedded into soil, and concrete is poured to seal the mounting opening (51) after the one-way valve (6) is mounted, and a liquid injection opening of the one-way valve (6) is exposed;
s7, pore-forming construction; drilling holes on the periphery of the grout stopping wall (5) by adopting a small tunnel drilling machine, wherein a drilling rod of the drilling machine adopts an assembled drilling rod, and chemical grout is injected in the hole forming process;
s8, construction of a flower pipe (7): the periphery of the waste water pump room (4) is provided with a single row of flower pipes (7), the flower pipes (7) are immediately driven into the holes after the hole forming is finished in the S7, the construction sequence is that the flower pipes (7) are inserted below the excavation surface, the external insertion angle range of the flower pipes (7) positioned at the four corners of the waste water pump room (4) is 10-20 ℃, grouting construction is carried out after the flower pipes (7) are driven into the waste water pump room, and cement and water glass double-liquid slurry is adopted as slurry; in the step S8, a gap between the flower pipe (7) and the soil body is filled with a hard rubber ring (71) and is driven into a steel sleeve (72) to tightly press the hard rubber ring (71);
s9, deep hole grouting construction: all grouting holes (41) are arranged at the bottom of the waste water pump room (4) in a quincuncial shape, a tunnel drilling machine is adopted to vertically drill below the excavation surface at the bottom of the waste water pump room (4), chemical slurry water stop is adopted in the pore-forming process, a back-up grouting method is adopted after the chemical slurry water stop is drilled to the designed elevation, and cement and water glass double-liquid slurry is injected;
s10, grouting effect detection: inspection holes are uniformly formed in the slurry stopping wall (5) and the bottom of the wastewater pump room (4), sampling is carried out by adopting a drilling coring method, and grouting backfilling is carried out on the inspection holes by adopting 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, which is characterized by comprising the following steps: in the step S2, dewatering is carried out for 30 days in advance, then a foundation pit of the vertical shaft (1) is excavated, and a locking ring (11) of the vertical shaft (1) and a dwarf wall (12) on the locking ring are firstly arranged on the periphery of a wellhead before the foundation pit of the vertical shaft (1) is excavated.
3. The construction method of the water-rich sand layer wastewater pump house according to claim 1, which is characterized by comprising the following steps: in step S2, before concrete is sprayed, the size of the excavated section is checked, dangerous stones and the rock residues of the basement are removed, when water gushes, water spraying and concentrated water outlet points are arranged on the sprayed surface, drainage treatment is firstly carried out, dust and sundries on the excavated surface are cleaned by water or wind, the preliminary support is sprayed and protected in time, the sprayed concrete adopts a wet spraying process, a wet spraying machine is adopted for spraying the concrete for covering a steel net frame, and when the concrete is sprayed, an additive is firstly started, then wind is started, and then feeding is carried out, so that the concrete is easy to adhere, the rebound quantity is small, and the surface is moist and glossy.
4. The construction method of the water-rich sand layer wastewater pump house according to claim 3, wherein the construction method comprises the following steps: in step S2, the nozzle of the wet sprayer is always perpendicular to the rock face.
5. The construction method of the water-rich sand layer wastewater pump house according to claim 3, wherein the construction method comprises the following steps: in step S2, the spraying operation is performed sequentially from bottom to top with larger depressions, and then spraying and leveling are performed.
6. The construction method of the water-rich sand layer wastewater pump house according to claim 3, wherein the construction method comprises the following steps: in the step S2, the mixing amount of the additive accounts for 5-10%, after the additive is added, the mixture is uniformly stirred in a wet spraying machine, and when concrete is sprayed, the surface of a sprayed layer is flat and smooth, and dry spots or slippage and flowing are reduced.
7. The construction method of the water-rich sand layer wastewater pump house according to claim 1, which is characterized by comprising the following steps: in the step S7, the pore-forming operation can be carried out after the concrete strength of the slurry-stopping wall (5) required for pore-forming construction reaches 85% of the design strength, and the pore-forming operation is carried out by directly drilling the soil near the slurry-stopping wall (5) after the drilling machine adjusts the angle.
8. The construction method of the water-rich sand layer wastewater pump house according to claim 1, which is characterized by comprising the following steps: in step S9, after the grouting of the pit bottom of the wastewater pump room (4) is completed, the back-off grouting is adopted in the lifting process of the drill rod, and cement and water glass double-liquid slurry is injected into the excavated soil body.
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