CN210369276U - Combined water pump house of underground tunnel - Google Patents
Combined water pump house of underground tunnel Download PDFInfo
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- CN210369276U CN210369276U CN201920584263.XU CN201920584263U CN210369276U CN 210369276 U CN210369276 U CN 210369276U CN 201920584263 U CN201920584263 U CN 201920584263U CN 210369276 U CN210369276 U CN 210369276U
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Abstract
The utility model relates to the technical field of tunnel civil engineering design, and provides a combined water pump room of an underground tunnel, which comprises a tunnel body, a prefabricated open caisson at the lower part of the water pump room for storing water and a cast-in-situ body at the upper part of the water pump room for placing pumping equipment, wherein the cast-in-situ body at the upper part of the water pump room and the tunnel body are arranged side by side, and a water outlet arranged at the lower end of the tunnel body is communicated with a water inlet hole arranged on the cast-in-situ body at the upper part of the water pump room, so that water in the tunnel body enters; the prefabricated open caisson at the lower part of the water pump room is positioned under the cast-in-place body at the upper part of the water pump room, and the prefabricated open caisson at the lower part of the water pump room is communicated with the cast-in-place body at the upper part of the water pump room. The combined water pump house of the underground tunnel can solve the problem of difficult foundation pit support of a pit in a water-rich sand layer geological pit, and under the condition that the pile length, the pile diameter and the reinforcing bars of a foundation pit supporting pile are not increased, a prefabricated open caisson at the lower part of the water pump house is used as a reservoir of the combined pump house, so that the combined water pump house is economical, reasonable, safe and reliable.
Description
Technical Field
The utility model relates to a tunnel civil engineering design and construction technical field especially relate to a combination formula water pump room in underground tunnel.
Background
With the progress of urban construction, the underpass tunnel projects are more and more, because the longitudinal slopes of the underpass tunnels are mostly in a V shape, the lowest point is positioned below a road, cleaning water, surrounding rock seepage and precipitation in the tunnel cannot be naturally discharged, a water pump room is required to be arranged at the lowest point, and then the cleaning water, the surrounding rock seepage and the precipitation are pumped and discharged to a road drainage system. The volume of the pump room reservoir is calculated according to the catchment area, the depth is generally 3-5 m, the deepest foundation pit at the pump room is, and the foundation pit support of the node often becomes a key difficulty of a project.
Because the end elevation of pump house is less than road design elevation, the degree of depth of pump house department foundation ditch also increases correspondingly, forms the pit in the pit, needs local deep digging, has following problem during the construction: in order to meet the requirement of the embedment depth, a support pile and a water stop pile of the large foundation pit need to be locally deepened, and the pile diameter needs to be increased or reinforcing bars need to be arranged according to the calculation result; when the geological condition is better, the small foundation pit of the pump house can be excavated by slope-releasing, in order to ensure the bearing capacity of the foundation and prevent uneven settlement, the space between the side slope and the main structure of the pump house needs to be backfilled by plain concrete, and the backfilling volume is large; when the geological conditions are poor, particularly when a water-rich sand layer which collapses along with excavation is dug, a support pile is arranged between a small foundation pit of a pump room and a tunnel, the construction cost is high, and the construction period is influenced; because the depth of the foundation pit is increased by 3-5 m, and the increase of the temporary support is difficult, the engineering risk is high, and the construction difficulty is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a safe and reliable, construction convenience's combination formula water pump room in underground tunnel to solve the big problem of the water pump room construction degree of difficulty in current underground tunnel.
The embodiment of the utility model provides a combination formula water pump house in underground tunnel, include: the water pump room comprises a tunnel body, a prefabricated open caisson at the lower part of a water pump room for storing water and a cast-in-place body at the upper part of the water pump room for placing pumping equipment, wherein the cast-in-place body at the upper part of the water pump room and the tunnel body are arranged side by side, and a water outlet arranged at the lower end of the tunnel body is communicated with a water inlet hole arranged on the cast-in-place body at the upper part of the water pump room, so that water in the tunnel body enters the cast-in-place body at;
the prefabricated open caisson at the lower part of the water pump house is positioned under the cast-in-place body at the upper part of the water pump house, and the prefabricated open caisson at the lower part of the water pump house is communicated with the cast-in-place body at the upper part of the water pump house.
And a bottom sealing layer, a bottom plate layer and an anti-scouring layer are sequentially arranged from bottom to top along the bottom of the prefabricated open caisson at the lower part of the water pump house.
The bottom of the prefabricated open caisson at the lower part of the water pump room and the contact surface of the bottom plate layer are provided with a water stop adhesive and a first buried water stop arranged in the circumferential direction.
The bottom sealing layer comprises a stone layer, a sand cushion layer and a C20 plain concrete layer which are sequentially arranged from bottom to top.
And a second buried water stop arranged in the circumferential direction is arranged on the contact surface of the prefabricated open caisson at the lower part of the water pump room and the cast-in-place body at the upper part of the water pump room.
The tunnel body is provided with a plurality of telescopic seam type intercepting ditches, and the telescopic seam type intercepting ditches are communicated with water inlet holes in the cast-in-situ body on the upper part of the water pump room.
The cast-in-place body on the upper part of the water pump room is internally provided with a station platform plate, and the distance between the station platform plate and the top of the cast-in-place body on the upper part of the water pump room is three quarters of the height of the cast-in-place body on the upper part of the water pump room.
The width of the bottom surface of the cutting edge of the prefabricated open caisson at the lower part of the water pump room is 0.2-0.4 m, and the included angle between the inclined surface of the cutting edge and the horizontal plane is more than or equal to 45 degrees.
The combined water pump house of the underground tunnel provided by the embodiment of the utility model adopts the prefabricated open caisson at the lower part of the water pump house and the cast-in-situ body at the upper part of the water pump house, so that the problem of foundation pit support of a pit in a pit can be avoided, and the construction cost is saved; the prefabrication of the prefabricated open caisson at the lower part of the water pump house and the excavation of the foundation pit can be carried out simultaneously, so that the construction period is ensured; the prefabricated open caisson structure at the lower part of the water pump house has high strength and rigidity, so that the safety of a local deep excavation foundation pit is guaranteed; the cast-in-place body on the upper part of the upper water pump room has flexible form and meets the use function requirements of various water pump rooms; is particularly suitable for the geology of the water-rich sand layer and has good social benefit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a sectional view of the combined water pump room of the underground tunnel of the present invention;
fig. 2 is a vertical view of the combined water pump room of the underground tunnel of the present invention;
fig. 3 is a plan view of the combined water pump room of the underground tunnel of the present invention;
fig. 4 is a flow chart of the construction method of the combined water pump room of the underground tunnel of the present invention.
Description of reference numerals:
1-drilling a cast-in-place pile; 2-high pressure jet grouting pile; 3, prefabricating an open caisson at the lower part of the water pump house; 4-a second buried water stop; 5-water stop glue; 6-sealing the bottom layer; 7-floor layer; 8-anti-scouring layer; 9-casting the body on the upper part of the water pump room in situ; 10-water inlet holes; 11-door opening; 12-a vent hole; 13-water pump hoisting holes; 14-water pumping hole of water pump room; 15-water outlet; 16-a station deck; 17-a tunnel body; 18-expansion slit type catch drain; 19-first buried water stop.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, fig. 2 and fig. 3, the embodiment of the utility model provides a combined water pump room of underground tunnel includes: the water pump house comprises a tunnel body 17, a prefabricated open caisson 3 at the lower part of a water pump house for storing water and a cast-in-situ body 9 at the upper part of the water pump house for placing pumping equipment, wherein the cast-in-situ body 9 at the upper part of the water pump house and the tunnel body 17 are arranged side by side, and a water outlet arranged at the lower end of the tunnel body 17 is communicated with a water inlet hole 10 arranged on the cast-in-situ body 9 at the upper part of the water pump house so that water in the tunnel body 17 enters the cast-in-;
the prefabricated open caisson 3 at the lower part of the water pump house is positioned under the cast-in-place body 9 at the upper part of the water pump house, and the prefabricated open caisson 3 at the lower part of the water pump house is communicated with the cast-in-place body 9 at the upper part of the water pump house.
The method comprises the steps that the structure of a tunnel body and the outer contour line of a combined water pump room are lofted according to a construction drawing design drawing, the central line of a supporting pile is lofted according to a pile-by-pile coordinate table, the central line of the supporting pile is properly lofted in consideration of construction errors, the lofting value is preferably about 10cm, a plurality of cast-in-situ bored piles 1 are arranged along the lofted central line, and a high-pressure jet grouting pile 2 is arranged between every two adjacent cast-in-situ bored piles 1;
wherein the hole position error of the cast-in-situ bored pile 1 is not more than 50mm, the inclination is not more than 0.5%, and the mud density after hole cleaning is less than 1.15 multiplied by 103kg/m3The thickness of the sinking silt at the bottom of the hole is not more than 100mm, underwater concrete is adopted for pouring and continuous construction is required, and the filling coefficient of the concrete is not less than 1.05; and 2 holes of high-pressure jet grouting pileThe bit error is not more than 20mm, the inclination is not more than 1%, the drilling depth error is not more than 100mm, the pressure of the slurry is not less than 20MPa, the air pressure is not less than 0.7MPa, the lifting speed is not more than 12-15 cm/min, the rotating speed is not more than 20 r/min, the water-cement ratio of the cement slurry is 1:1, the cement mixing amount is 35%, and the P.O.42.5R pure cement slurry is adopted for filling;
after the foundation pit is excavated to the elevation of the substrate in a layered mode, sinking the prefabricated open caisson 3 at the lower part of the prefabricated water pump house to the designed elevation; pouring a cast-in-place body 9 at the upper part of the water pump room, which is communicated with the prefabricated open caisson 3 at the lower part of the water pump room; and a tunnel body 17 arranged side by side with the cast-in-place body 9 on the upper part of the water pump room is constructed, and a water outlet arranged at the lower end of the tunnel body 17 is communicated with a water inlet 10 arranged on the cast-in-place body 9 on the upper part of the water pump room.
In the embodiment of the utility model, the prefabricated open caisson at the lower part of the water pump house and the cast-in-place body at the upper part of the water pump house are adopted, so that the problem of foundation pit support in a pit-in-pit can be avoided, and the construction cost is saved; the prefabrication of the prefabricated open caisson at the lower part of the water pump house and the excavation of the foundation pit can be carried out simultaneously, so that the construction period is ensured; the prefabricated open caisson structure at the lower part of the water pump house has high strength and rigidity, so that the safety of a local deep excavation foundation pit is guaranteed; the cast-in-place body on the upper part of the upper water pump room has flexible form and meets the use function requirements of various water pump rooms; is particularly suitable for the geology of the water-rich sand layer and has good social benefit.
On the basis of the embodiment, a bottom sealing layer 6, a bottom plate layer 7 and an anti-scouring layer 8 are sequentially arranged from bottom to top along the bottom of the prefabricated open caisson 3 at the lower part of the water pump house.
It should be noted that the bottom sealing layer 6 is provided for preventing the sand flow phenomenon and effectively reducing the later sedimentation; and the bottom sealing layer 6 is constructed after the sinking of the prefabricated open caisson at the lower part of the water pump house is stable.
The embodiment of the utility model provides an in, prefabricated open caisson 3 in water pump house lower part sinks to design elevation after, executes and does back cover layer 6: the bottom sealing layer 6 is carried out after the sedimentation rate is less than or equal to 20mm/d, firstly graded broken stones are adopted for tamping, then block stones are filled at the blade foot part of the prefabricated open caisson 3 at the lower part of the water pump house, then a layer of sand cushion layer of about 20cm is paved on the surface, and finally C20 plain concrete is adopted for pouring to the bottom elevation of the bottom plate;
and (3) grouting and reinforcing the mud skin on the side wall of the prefabricated open caisson 3 at the lower part of the water pump house: 26 PVC sleeve valve pipes with the diameter of 50mm are arranged along the periphery of the prefabricated open caisson 3 at the lower part of the water pump room, the length of the PVC sleeve valve pipes is 5.5m, and a pair of grouting holes with the diameter of 10mm are longitudinally arranged at intervals of 30cm on a pipe body; sleeve valve pipe pore-forming diameter 100mm, the straightness that hangs down is less than 1%, adopts the clear hole of mud after the pore-forming is accomplished to up pour the cover shell material from the hole bottom, put into sleeve valve pipe after that, treat that the cover shell reaches design strength rear and can slip casting, the thick liquid adopts cement: fly ash: sand: 1 part of water: 0.55: 4.0: 1.0, grouting at the pressure of 0.7-1.2 MPa, and symmetrically performing grouting in a mode of alternately grouting;
and (3) binding the steel bars of the bottom plate layer 7 of the prefabricated open caisson 3 at the lower part of the water pump house, and pouring concrete: the bottom plate layer 7 is cast by C45 concrete with the thickness of 80cm, and the longitudinal and transverse main reinforcements are C20@100 mm; after the concrete of the bottom plate layer 7 is finally set, an anti-scouring layer 8 of C20 plain concrete with the thickness of 20cm is formed.
It should be noted that the plane size and depth of the prefabricated open caisson 3 at the lower part of the water pump house are calculated according to the catchment area of the road; the prefabricated open caisson 3 at the lower part of the water pump house is made of reinforced concrete, the strength is not lower than C25, and the height of each section is not higher than 5 m; the cutting edge of the prefabricated open caisson 3 at the lower part of the water pump room is a sharp cutting edge or a cutting edge with a tread according to geological conditions, the width of the bottom surface is 0.2-0.4 m, and the intersection angle of the inclined plane of the cutting edge and the horizontal plane is not suitable to be less than 45 degrees.
On the basis of the embodiment, the contact surface between the bottom of the prefabricated open caisson 3 at the lower part of the water pump room and the bottom plate layer 7 is provided with the water stop glue 5 and the first embedded water stop band 19 which is annularly arranged.
The first buried water stop belt 19 is 30cm wide, 10mm thick, 60 +/-5 in hardness, not less than 15MPa in tensile strength, not less than 380% in elongation at break, not more than 35% in permanent compression deformation, not less than 30kN in tear strength and not more than-45 ℃ in brittleness temperature;
the water stop adhesive 5 adopts a PN-300 type, has the volume expansion rate of not less than 300 percent, does not flow at the high temperature of 80 ℃ within 5 hours, and does not have brittle fracture at the low temperature of-20 ℃ within 2 hours.
On the basis of the embodiment, the contact surface of the prefabricated open caisson 3 at the lower part of the water pump room and the cast-in-place body 9 at the upper part of the water pump room is provided with the second buried water stop 4 which is annularly arranged.
The width of the second buried water stop 4 is 30cm, the thickness is 10mm, the hardness is 60 +/-5, the tensile strength is not less than 15MPa, the elongation at break is not less than 380%, the compression permanent deformation is not more than 35%, the tear strength is not less than 30kN, and the brittleness temperature is not more than-45 ℃.
On the basis of the above embodiment, the tunnel body 17 is provided with a plurality of telescopic seam type intercepting ditches 18, and the telescopic seam type intercepting ditches 18 are communicated with the water inlet holes 10 on the cast-in-situ body 9 at the upper part of the water pump room.
It should be noted that, during the road construction of the tunnel body 17, the XF400 type expansion joint type catch basin is buried, the width of the XF400 type expansion joint type catch basin is 50cm, the height is 50cm, the position of the XF400 type expansion joint type catch basin corresponds to the water inlet 10 on the cast-in-situ body 9 on the upper part of the water pump room, and the periphery of the XF400 type expansion joint type catch basin is reinforced by C45 steel fiber concrete.
On the basis of the above embodiment, the station board 16 is arranged inside the cast-in-place body 9 on the upper part of the water pump room, and the distance between the station board 16 and the top of the cast-in-place body 9 on the upper part of the water pump room is three quarters of the height of the cast-in-place body 9 on the upper part of the water pump room.
It should be noted that, the cast-in-place body 9 on the upper part of the pouring water pump room needs to pay attention to the reservation of the holes and the treatment of the superposed base surface, and the station bedplate 16 is poured after the concrete reaches the designed strength;
the reserved holes mainly comprise water inlet holes 10, door openings 11, ventilation holes 12, water pump hoisting holes 13, water pumping holes 14 of a water pump room, water outlet holes 15, cable holes and the like.
Fig. 4 is the utility model discloses the flow chart of the construction method of the combination formula water pump room in underground tunnel, as shown in fig. 4, the embodiment of the utility model provides a construction method of combination formula water pump room in underground tunnel, include:
s1, driving a plurality of cast-in-situ bored piles 1 along the lofted center line, and driving a high-pressure jet grouting pile 2 between two adjacent cast-in-situ bored piles;
lofting the structure of a tunnel body and the outer contour line of a combined water pump room according to a construction drawing design drawing, lofting the central line of a support pile according to a pile-by-pile coordinate table, properly outwardly placing the central line of the support pile by considering construction errors, wherein the outwardly placing value is preferably about 10cm, driving a plurality of cast-in-situ bored piles 1 along the lofted central line, and driving a high-pressure rotary jet grouting pile 2 between two adjacent cast-in-situ bored piles 1;
the hole site error of the cast-in-situ bored pile 1 is not more than 50mm, the inclination is not more than 0.5 percent, and the density of the slurry after hole cleaning is less than 1.15 multiplied by 103kg/m3The thickness of the sinking silt at the bottom of the hole is not more than 100mm, underwater concrete is adopted for pouring and continuous construction is required, and the filling coefficient of the concrete is not less than 1.05; and the hole site error of the high-pressure jet grouting pile 2 is not more than 20mm, the inclination is not more than 1%, the drilling depth error is not more than 100mm, the slurry pressure is not less than 20MPa, the air pressure is not less than 0.7MPa, the lifting speed is not more than 12 cm-15 cm/min, the rotating speed is not more than 20 r/min, the water-cement ratio of the cement slurry is 1:1, the cement mixing amount is 35%, and P.O.42.5R pure cement slurry is adopted for filling;
s2, after the foundation pit is excavated to the base elevation in a layered mode, sinking the prefabricated open caisson at the lower portion of the water pump room to the designed elevation;
after the foundation pit is excavated to the designed elevation in a layered mode, the prefabricated open caisson at the lower portion of the water pump house is in place, and water is drained and sinks; the drainage sinking means that a water suction pump is arranged in a prefabricated open caisson at the lower part of a water pump house, water is pumped while digging is carried out, in order to prevent sand from flowing into the open caisson, basin-type digging is adopted, a middle soil body is dug out firstly, then a soil body close to the blade foot is dug out, the digging depth is not suitable to be larger than 50cm each time, correction is carried out immediately after the digging out is finished each time, the digging can be continued at the correction rear part, and when the digging is carried out to the designed elevation, the deformation amount of 5-8 cm is reserved.
S3, after finishing the bottom sealing layer, the bottom plate layer and the anti-scouring layer which are applied to the prefabricated open caisson at the lower part of the water pump house, pouring a cast-in-situ body at the upper part of the water pump house communicated with the prefabricated open caisson at the lower part of the water pump house;
the prefabricated open caisson 3 of water pump house lower part sinks to the design elevation after, executes and does back cover layer 6: the bottom sealing layer 6 is carried out after the sedimentation rate is less than or equal to 20mm/d, firstly graded broken stones are adopted for tamping, then block stones are filled at the blade foot part of the prefabricated open caisson 3 at the lower part of the water pump house, then a layer of sand cushion layer of about 20cm is paved on the surface, and finally C20 plain concrete is adopted for pouring to the bottom elevation of the bottom plate;
and (3) grouting and reinforcing the mud skin on the side wall of the prefabricated open caisson 3 at the lower part of the water pump house: 26 PVC sleeve valve pipes with the diameter of 50mm are arranged along the periphery of the prefabricated open caisson 3 at the lower part of the water pump room, the length of the PVC sleeve valve pipes is 5.5m, and a pair of grouting holes with the diameter of 10mm are longitudinally arranged at intervals of 30cm on a pipe body; sleeve valve pipe pore-forming diameter 100mm, the straightness that hangs down is less than 1%, adopts the clear hole of mud after the pore-forming is accomplished to up pour the cover shell material from the hole bottom, put into sleeve valve pipe after that, treat that the cover shell reaches design strength rear and can slip casting, the thick liquid adopts cement: fly ash: sand: 1 part of water: 0.55: 4.0: 1.0, grouting at the pressure of 0.7-1.2 MPa, and symmetrically performing grouting in a mode of alternately grouting;
and (3) binding the steel bars of the bottom plate layer 7 of the prefabricated open caisson 3 at the lower part of the water pump house, and pouring concrete: the bottom plate layer 7 is cast by C45 concrete with the thickness of 80cm, and the longitudinal and transverse main reinforcements are C20@100 mm; after the concrete of the bottom plate layer 7 is finally set, an anti-scouring layer 8 of C20 plain concrete with the thickness of 20cm is formed.
The plane size and the depth of the prefabricated open caisson 3 at the lower part of the water pump house are calculated according to the catchment area of the road; the prefabricated open caisson 3 at the lower part of the water pump house is made of reinforced concrete, the strength is not lower than C25, and the height of each section is not higher than 5 m; the cutting edge of the prefabricated open caisson 3 at the lower part of the water pump room is a sharp cutting edge or a cutting edge with a tread according to geological conditions, the width of the bottom surface is 0.2-0.4 m, and the intersection angle of the inclined plane of the cutting edge and the horizontal plane is not suitable to be less than 45 degrees.
Pouring the cast-in-place body 9 on the upper part of the water pump room, wherein the reservation of holes and the treatment of a superposed base surface need to be paid attention to, and pouring the station bedplate 16 after the concrete reaches the design strength;
the reserved holes mainly comprise water inlet holes 10, door openings 11, ventilation holes 12, water pump hoisting holes 13, water pumping holes 14 of a water pump room, water outlet holes 15, cable holes and the like.
And S4, constructing a tunnel body which is arranged in parallel with the cast-in-place body on the upper part of the water pump room, and communicating a water outlet arranged at the lower end of the tunnel body with a water inlet hole arranged on the cast-in-place body on the upper part of the water pump room.
The tunnel body 17 is provided with a plurality of telescopic seam type intercepting ditches 18, and the telescopic seam type intercepting ditches 18 are communicated with the water inlet holes 10 on the cast-in-situ body 9 at the upper part of the water pump room.
On the basis of the embodiment, before the cast-in-place body at the upper part of the water pump room communicated with the prefabricated open caisson at the lower part of the water pump room is poured, roughening the surface of the prefabricated open caisson at the lower part of the water pump room is further included, and cement-based permeable crystalline waterproof paint is coated.
In the embodiment of the utility model, the surface of the prefabricated open caisson at the lower part of the water pump house is roughened and cleaned, and 1.5kg/m is coated2And (3) cement-based permeable crystallization type waterproof coating, and then pouring the cast-in-place body on the upper part of the water pump house in time. The cement-based permeable crystalline waterproof coating is uniform and free of agglomeration, has a water content of not more than 1.5%, a chloride ion content of not more than 0.1%, a flexural strength of more than 2.8MPa, a compressive strength of more than 15MPa, a wet base surface bonding strength of more than 1MPa, and has good permeability.
Taking a construction method of a combined water pump room of an underground tunnel of a trunk road of a certain coastal city as an example, the starting and end mileage of the underpass tunnel and the U-shaped groove is K2+ 240-K2 +680, wherein the east U-shaped groove is 150m long, the tunnel is 120m long, the south U-shaped groove is 170m long, the underpass tunnel is respectively provided with water intercepting ditches at K2+240, K2+390, K2+510 and K2+680, rainwater in the U-shaped groove is collected and collected to the water pump room at K2+473, and the collected water is lifted to a road drainage system by adopting a water suction pump. The water collection area of the U-shaped grooves at two ends is about 2.8 hectares, the volume of the reservoir of the pump room is about 60m3 by calculation, the reservoir with the length multiplied by the width multiplied by the height is 5.4 multiplied by 3.6 multiplied by 3.9m is designed, the pump room adopts a cast-in-place superposed open caisson pump room structure, the lower part is a prefabricated open caisson at the lower part of the pump room, the upper part is a cast-in-place body at the upper part of the cast-in-place pump room, and the clearance in the pump room is 5.4 multiplied by 3.6 multiplied by 9.7 m. The original landform of the project belongs to a beach land in a coastal intertidal zone, and is artificially backfilled for land making (the filling mainly comprises sand filling and partial filling soil) due to construction, the tide type of a sea area is normal semi-solar tide, the scouring force to the shore is strong, the highest tide level is 4.54m, and the lowest tide level is-3.3 m.
The construction method of the combined water pump room of the underground tunnel comprises the following steps:
measuring and lofting: lofting out a tunnel main body structure and a pump house outer contour line according to a construction drawing design drawing, and lofting out a support pile center line according to a pile-by-pile coordinate table, wherein the support pile center line is properly placed outside in consideration of construction errors, and the placement value is preferably about 10 cm;
constructing a foundation pit enclosure structure: adopting a phi 1200-1400 mm cast-in-situ bored pile for protection, wherein the pile length is 18 m; adopting a phi 600@1400mm high-pressure jet grouting pile to stop water among piles, wherein the pile length is 15 m; the pile face is sprayed with C20 concrete with the thickness of 10cm and reinforcing mesh with the diameter of 10@200 multiplied by 200 mm; two steel supports with diameter of 609 multiplied by 16mm are adopted for supporting, and the longitudinal distance is 4.0 m. During pile foundation construction, the verticality should be well controlled to prevent limit invasion, and a construction error space should be reserved;
prefabricating a prefabricated open caisson at the lower part of the water pump house: c45 concrete is poured into the prefabricated open caisson at the lower part of the water pump house; the net length is 5.4m, the net width is 3.6m, the height is 5.0m, and the wall thickness is 80 cm; the height of the cutting edge is 90cm, the width of the bottom is 35cm, the thickness is 80cm, and the angle between the cutting edge and the horizontal plane is 55 degrees; the lower part of the water pump room is prefabricated with an open caisson annular main rib C20@100mm and a vertical main rib C25@120mm, and the blade foot is reinforced by a Q235 steel plate with the thickness of 10 mm; a pre-groove with the depth of 20cm and the width of 100cm is arranged at the bottom of a prefabricated open caisson at the lower part of the water pump room; the interface of the top of the prefabricated open caisson at the lower part of the water pump house and the cast-in-place body at the upper part of the water pump house is provided with two second annular middle-buried water stops, and the interface of the bottom and the bottom plate layer is provided with two first annular middle-buried water stops and two water-swelling water stop glues;
after the foundation pit is excavated to the designed elevation in a layered mode, the prefabricated open caisson at the lower part of the water pump house is in place, and drainage is sunk: drainage sinking refers to the fact that a water pumping pump house is arranged in a prefabricated open caisson at the lower portion of the water pump house, water pumping and basin type excavation are conducted while water pumping are conducted, a middle soil body is excavated, then a soil body close to the edge foot is excavated, the excavation depth is not larger than 50cm each time, correction is conducted immediately after excavation is conducted each time, and when the excavation reaches the designed elevation, deformation of 5-8 cm is reserved.
And (3) after the prefabricated open caisson at the lower part of the water pump house sinks to the designed elevation, constructing a bottom sealing layer: sealing the bottom layer after the sedimentation rate is less than or equal to 20mm/d, firstly tamping and filling graded broken stones, then filling block stones in the blade foot part, then paving a layer of sand cushion layer of about 20cm on the surface, and finally pouring C20 plain concrete to the bottom elevation of the bottom plate;
grouting and reinforcing the mud skin on the prefabricated open caisson side wall at the lower part of the water pump house: 26 PVC sleeve valve pipes with the diameter of 50mm are arranged on the periphery of a prefabricated open caisson at the lower part of a water pump room, the length of the PVC sleeve valve pipes is 5.5m, and a pair of phi 10 grouting holes are longitudinally arranged at intervals of 30cm on a pipe body; sleeve valve pipe pore-forming diameter 100mm, the straightness that hangs down is less than 1%, adopts the clear hole of mud after the pore-forming is accomplished to up pour the cover shell material from the hole bottom, put into sleeve valve pipe after that, treat that the cover shell reaches design strength rear and can slip casting, the thick liquid adopts cement: fly ash: sand: 1 part of water: 0.55: 4.0: 1.0, grouting at the pressure of 0.7-1.2 MPa, and symmetrically performing grouting in a mode of alternately grouting;
binding the steel bars of the bottom plate layer of the prefabricated open caisson at the lower part of the water pump house, and pouring bottom plate layer concrete: the bottom plate layer is cast by C45 concrete with the thickness of 80cm, the longitudinal and transverse main ribs are C20@100mm, sundries on the surface of the water stop belt are cleaned up before the bottom plate layer is constructed, and two PN-300 type water swelling water stop adhesives are arranged. After the bottom plate concrete is finally set, a C20 plain concrete scour-prevention layer with the thickness of 20cm is constructed;
roughening and cleaning the surface of a prefabricated open caisson at the lower part of a water pump room, and smearing 1.5kg/m2And (3) cement-based permeable crystallization type waterproof coating, and then pouring the cast-in-place body on the upper part of the water pump house in time. The cast-in-place body at the upper part of the water pump room is made of concrete with the thickness of 80cm C45, a vertical main rib C25@120mm, a horizontal distribution rib C16@300mm, and a platform plate with the thickness of 30cm is 5.2m below a top plate; the size of a reserved door opening is 150 multiplied by 210cm, the size of a water inlet hole is 50 multiplied by 50cm, the diameter of a vent hole is phi 600mm, the size of a water pump hoisting hole is 180 multiplied by 130cm, the diameters of a water pump pumping hole and a water outlet hole of the water pump are phi 300mm, the diameter of a cable hole is phi 100mm, and the periphery of a larger hole is reinforced by 8C 20 reinforcing ribs;
constructing a tunnel body structure: the net width of the tunnel is 8.6m, the net height is 5.8m, the top plate is 100cm thick, the bottom plate is 110cm thick, the side wall is 90cm thick, C45 concrete is adopted for pouring, 8 steel bars are arranged every meter, and the diameter of a main bar is 25 mm; when in pavement construction, an XF400 type telescopic seam type intercepting ditch is buried, the width is 50cm, the height is 50cm, the position corresponds to a water inlet hole of a pump room, and the periphery of the intercepting ditch is reinforced by C45 steel fiber concrete.
The embodiment of the utility model provides a construction method of combined water pump house of underground tunnel adopts prefabricated open caisson in the lower part of the water pump house and cast-in-place body on the upper part of the water pump house, can not consider the problem of foundation pit supporting of pit-in-pit, has saved the construction cost; the prefabrication of the prefabricated open caisson at the lower part of the water pump house and the excavation of the foundation pit can be carried out simultaneously, so that the construction period is ensured; the prefabricated open caisson structure at the lower part of the water pump house has high strength and rigidity, so that the safety of a local deep excavation foundation pit is guaranteed; the cast-in-place body on the upper part of the upper water pump room has flexible form and meets the use function requirements of various water pump rooms; is particularly suitable for the geology of the water-rich sand layer and has good social benefit.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. A combined water pump house of an underground tunnel, comprising: the cast-in-place water pump house comprises a tunnel body, a prefabricated open caisson at the lower part of a water pump house for storing water and a cast-in-place body at the upper part of the water pump house for placing pumping equipment, and is characterized in that the cast-in-place body at the upper part of the water pump house and the tunnel body are arranged side by side, and a water outlet arranged at the lower end of the tunnel body is communicated with a water inlet hole arranged on the cast-in-place body at the upper part of the water pump house so that water in the tunnel body enters the cast-in;
the prefabricated open caisson at the lower part of the water pump house is positioned under the cast-in-place body at the upper part of the water pump house, and the prefabricated open caisson at the lower part of the water pump house is communicated with the cast-in-place body at the upper part of the water pump house.
2. The combined type water pump house of the underground tunnel according to claim 1, wherein a back cover layer, a bottom plate layer and an anti-scouring layer are sequentially arranged along the bottom of the prefabricated open caisson at the lower part of the water pump house from bottom to top.
3. The combined type water pump house of the underground tunnel according to claim 2, wherein the contact surface between the bottom of the prefabricated open caisson at the lower part of the water pump house and the bottom plate layer is provided with a water stop glue and a first middle-buried water stop strip which is annularly arranged.
4. The combined water pump house of the underground tunnel according to claim 2, wherein the bottom sealing layer comprises a stone layer, a sand cushion layer and a C20 plain concrete layer which are sequentially arranged from bottom to top.
5. The combined type water pump room of the underground tunnel according to claim 1, wherein a second buried water stop arranged in a circumferential direction is arranged on a contact surface of the prefabricated open caisson at the lower part of the water pump room and the cast-in-place body at the upper part of the water pump room.
6. The combined type water pump house of the underground tunnel according to claim 1, wherein the tunnel body is provided with a plurality of expansion joint type intercepting ditches, and the expansion joint type intercepting ditches are communicated with water inlet holes on a cast-in-situ body at the upper part of the water pump house.
7. The combined type water pump house of an underground tunnel according to claim 1, wherein a station plate is arranged inside the cast-in-place body at the upper part of the water pump house, and the distance between the station plate and the top of the cast-in-place body at the upper part of the water pump house is three quarters of the height of the cast-in-place body at the upper part of the water pump house.
8. The combined water pump house of the underground tunnel according to claim 1, wherein the width of the bottom surface of the blade foot of the prefabricated open caisson at the lower part of the water pump house is 0.2-0.4 m, and the included angle between the inclined plane of the blade foot and the horizontal plane is greater than or equal to 45 degrees.
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| CN110093971A (en) * | 2019-04-26 | 2019-08-06 | 中铁第四勘察设计院集团有限公司 | The Combined water pump house and its construction method of subterranean tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110093971A (en) * | 2019-04-26 | 2019-08-06 | 中铁第四勘察设计院集团有限公司 | The Combined water pump house and its construction method of subterranean tunnel |
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