CN116378044A - Elevator foundation pit shaft construction method - Google Patents
Elevator foundation pit shaft construction method Download PDFInfo
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- CN116378044A CN116378044A CN202310388220.5A CN202310388220A CN116378044A CN 116378044 A CN116378044 A CN 116378044A CN 202310388220 A CN202310388220 A CN 202310388220A CN 116378044 A CN116378044 A CN 116378044A
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- 238000010276 construction Methods 0.000 title claims abstract description 84
- 238000009412 basement excavation Methods 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 22
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 47
- 239000010959 steel Substances 0.000 claims description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 239000002689 soil Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 17
- 238000013461 design Methods 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims 2
- 238000001556 precipitation Methods 0.000 abstract description 6
- 238000009435 building construction Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
Abstract
The invention discloses a construction method of an elevator foundation pit shaft, which relates to the field of building construction and comprises the following steps: measuring the position of a foundation pit of a paying-off building; building foundation pit excavation; measuring a paying-off elevator pit shaft; digging an elevator foundation pit well; binding a bedding layer and reinforcing steel bars of an elevator foundation pit well; pouring concrete in an elevator foundation pit well; binding construction of a building foundation pit cushion layer, a waterproof coiled material and reinforcing steel bars; and (3) building foundation pit bottom plate concrete pouring construction and the like. According to the construction method, the local precipitation is adopted for the elevator foundation pit shaft in consideration of cost and overall structural property, so that the construction workload is reduced, the construction cost is reduced, and the construction time is saved; meanwhile, the construction method connects the elevator foundation pit well and the foundation construction into a whole, reduces the joint treatment flow, ensures the integrity and the waterproofness, and improves the quality of the foundation construction.
Description
Technical Field
The invention relates to the field of foundation pit construction, in particular to an elevator foundation pit shaft construction method.
Background
In order to ensure the safety of the underground structure of the main body and the surrounding environment not to be damaged, the adopted supporting structure, precipitation and earthwork excavation and backfill comprise investigation, design, construction, monitoring, detection and the like, which are called foundation pit engineering, and are a system engineering with strong comprehensiveness. The foundation pit engineering is an old traditional subject in the foundation engineering of soil mechanics, and is a comprehensive geotechnical engineering problem, which not only relates to the typical problems of strength, stability and deformation in the soil mechanics, but also relates to the problem of the combined action of soil and a supporting structure. In foundation pit construction, not only safety of construction is considered, but also a proper scheme is adopted to control cost according to actual conditions. In the existing construction of building foundation pit, since the building is generally large and high, the elevator needs to be installed, and the elevator is relatively small, so the foundation pit of the elevator shaft is far smaller than the building foundation, and thus local precipitation and cost and the integrity of the elevator shaft and the building foundation need to be considered when constructing the elevator shaft.
Disclosure of Invention
The invention aims to provide an elevator foundation pit shaft construction method, which takes cost and overall structural property into consideration to locally lower water in the elevator foundation pit shaft, so that the construction workload is reduced, the construction cost is reduced, and the construction time is saved; meanwhile, the construction method connects the elevator foundation pit well and the foundation construction into a whole, reduces the joint treatment flow, ensures the integrity and the waterproofness, and improves the quality of the foundation construction.
The aim of the invention is realized by the following technical scheme:
the construction method of the elevator foundation pit well comprises the following construction steps:
s1, measuring and paying off the position of a building foundation pit, and arranging a circle of well point downcomer around the position of the foundation pit, wherein the bottom end of the well point downcomer is lower than the pit bottom of the building foundation pit designed to be excavated;
s2, carrying out slope-releasing excavation on the building foundation pit according to design requirements, supporting while excavating, excavating to a position 20cm high from the bottom of the designed building foundation pit, manually excavating to the building foundation pit, and manually excavating drainage ditches around the edge of the building foundation pit around the building foundation pit;
s3, paying off an elevator foundation pit excavation area at the position of the designed building elevator pit according to the design requirement, then manually excavating downwards for 20cm, wherein the length and the width of the elevator foundation pit excavation area are larger than those of the elevator foundation pit, the enlarged area is used as a working platform for excavating the elevator foundation pit downwards, a circle of pit water reducing pipes are distributed around the elevator foundation pit excavation area excavated downwards, and the bottom ends of the pit water reducing pipes are lower than the pit bottoms of the elevator foundation pit excavated by the design;
s4, carrying out slope excavation or supporting while excavating an elevator foundation pit well excavation area according to the design requirement, excavating to the designed height position of 20cm of the pit bottom of the elevator foundation pit well, manually excavating to the pit bottom of the elevator foundation pit well, excavating a water collecting pit lower than the pit bottom of the elevator foundation pit well at one side of the pit bottom of the elevator foundation pit well, and draining water of the water collecting pit in a foundation pit drainage mode;
s5, after the soil bearing capacity of the excavation area of the elevator foundation pit well and the pit bottom soil bearing capacity of the building foundation pit are checked and accepted to meet the requirements, pouring an elevator foundation pit bottom cushion layer, paving waterproof coiled materials, binding elevator foundation pit well steel bars, binding the steel bars of the working platform of the elevator foundation pit well and the elevator foundation pit well steel bars into a whole, and pre-burying binding vertical connecting steel bars in the vertical direction of the steel bars of the working platform of the elevator foundation pit well;
s6, after binding of the steel bars of the whole elevator foundation pit well excavation area is completed and acceptance is qualified, erecting a template, taking out a drain pipe in a water collecting pit at the bottom of the elevator foundation pit well in time, pouring concrete, and enabling vertical connecting steel bars to be higher than the poured concrete in the elevator foundation pit well excavation area;
s7, after the concrete in the whole elevator foundation pit well area is cured to be qualified, constructing a bedding layer of a building foundation pit bottom plate, paving a layer of waterproof coiled material above the bedding layer of the building foundation pit bottom plate, extending the waterproof coiled material paved above the bedding layer of the building foundation pit bottom plate above the concrete of the poured elevator foundation pit well, pressing the waterproof coiled material paved above the concrete of the poured elevator foundation pit well below the waterproof coiled material paved above the bedding layer of the building foundation pit bottom plate, and carrying out hot melting connection treatment;
s8, binding building foundation pit bottom plate reinforcing steel bars above the waterproof coiled materials above the paved whole building foundation pit bottom plate cushion layer, and performing concrete pouring on the building foundation pit bottom plate after acceptance inspection is qualified.
Preferably, in the step S1, a circle of intercepting ditches is constructed on the outer ring of the well point downcomer arranged around the foundation pit.
Preferably, in the step S2, when the building foundation pit is excavated on a slope, grading excavation is performed on the condition that the excavation gradient is greater than 1:5, the width of a grading reservation platform is greater than 2m, and the excavated soil body is directly transported to the building foundation pit or is piled up at a position which is far from the intercepting ditch by 2 m;
in the step S2, after the building foundation pit is manually excavated to the position of the building foundation pit, the bearing capacity of the building foundation pit is checked, and the next construction can be performed after the building foundation pit is qualified.
Preferably, in the step S4, in the elevator pit shaft excavated downwards, the excavated soil body and the time transport output building pit;
meanwhile, the elevator foundation pit shaft is excavated, the supporting is carried out at the same time, and the monitoring frequency of soil around the elevator foundation pit shaft is enhanced;
the pit is not less than 50cm away from the periphery of the pit bottom of the elevator foundation pit well, and the pit bottom of the pit is lower than the pit bottom of the elevator foundation pit well by not less than 50cm.
Preferably, in the step S5, the strength grade of the concrete used for the bottom cushion layer of the pit of the elevator pit is not less than C20, and the steel bars on the side wall of the elevator pit and the steel bars on the working platform of the elevator pit are prefabricated and integrally formed;
the bottom of vertical connecting reinforcement passes through welded mode, connects on elevator foundation ditch well's work platform's reinforcing bar.
Preferably, in the step S6, a layered pouring mode is adopted, steel bars of the bottom plate of the pit of the elevator pit are poured first, and concrete pouring is performed on the side wall of the pit of the elevator pit before the concrete of the bottom plate of the pit of the elevator pit is initially set.
Preferably, in S7, the waterproof coating is sprayed on the position where the waterproof coiled material laid above the cushion layer of the foundation pit floor passes through the vertical connecting steel bars.
Preferably, in S8, the vertical connection steel bars are connected with the bottom plate steel bars of the building foundation pit, the vertical connection steel bars and the bottom plate steel bars of the building foundation pit are horizontally reinforced and connected by the horizontal connection steel bars, and the connection positions are all subjected to rust-proof treatment.
The beneficial effects of the invention are as follows: the construction method combines the construction related requirements, comprehensively considers the construction cost and the construction quality, adopts the whole construction foundation pit, locally drains water, excavates the elevator foundation pit well, and connects and pours the elevator foundation pit well foundation concrete and the construction foundation pit bottom plate concrete into a whole, reduces the construction treatment of the joint position, saves the construction flow, time, cost and the like. According to the construction method, the local precipitation is adopted for the elevator foundation pit shaft in consideration of cost and overall structural property, so that the construction workload is reduced, the construction cost is reduced, and the construction time is saved; meanwhile, the construction method connects the elevator foundation pit well and the foundation construction into a whole, reduces the joint treatment flow, ensures the integrity and the waterproofness, and improves the quality of the foundation construction.
Drawings
Fig. 1 is a schematic diagram of a construction process flow of an elevator pit shaft construction method according to the present invention;
Detailed Description
For the purpose of making the technical solution and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention. It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
As shown in fig. 1, the construction method of the elevator foundation pit shaft combines the construction related requirements, comprehensively considers the construction cost and the construction quality, adopts the whole construction foundation pit, locally drains and excavates the elevator foundation pit shaft, and connects and pours the foundation concrete of the elevator foundation pit shaft and the bottom plate concrete of the construction foundation pit into a whole, reduces the construction treatment of joint positions, and saves the construction flow, time, cost and the like.
When the construction is specifically carried out, firstly, the position of a building foundation pit is measured and paid out according to a construction design drawing, then the position of a red line area excavated by the building foundation pit is marked by lime and the like, the marked position of the red line area of the building foundation pit is subjected to surface cleaning treatment, then the red line area of the building foundation pit after surface cleaning is drilled, the earth surface geological condition is determined, and a proper excavation scheme is formulated according to the geological condition; then, a circle of well point water dropping pipes are distributed around the edge of the marked red line area of the building foundation pit, the bottom ends of the well point water dropping pipes are lower than the pit bottom of the building foundation pit designed to be excavated, and the building foundation pit to be excavated is subjected to water dropping, so that the groundwater of the building foundation pit to be excavated is lower than the pit bottom of the excavated building foundation pit by less than 50cm; a circle of intercepting ditches are constructed on the outer ring of well point downcomer arranged around the building foundation pit, the positions of the intercepting ditches are not less than 1m away from red line areas excavated by the building foundation pit, and the surrounding precipitation is prevented from entering the excavated building foundation pit.
Further, then, carrying out slope-releasing excavation on the building foundation pit according to the design requirement, supporting while excavating, excavating to the position of 20cm height at the bottom of the designed building foundation pit, manually excavating to the building foundation pit, and manually excavating drainage ditches around the edge of the building foundation pit around the building foundation pit. In the construction process, when the building foundation pit is excavated in a slope manner, grading excavation is carried out on the condition that the excavation gradient is larger than 1:5, the width of a grading reserved platform is larger than 2m, the grading reserved platform can be used as a working platform for excavating a lower-stage platform, and excavated soil bodies can be directly transported to output the building foundation pit or stacked at a position far from a water interception ditch by 2 m; as the depth of excavation is continuously increased, the disturbance to the soil body is larger, so that the soil body around the excavated building foundation pit is required to be further reinforced, a circle of ring beams are constructed along the soil body around the excavated building foundation pit at intervals of 1-1.5m in the downward slope excavation process, and the ring beams are connected with an external pile foundation through a mode of pouring concrete through anchor rods, so that the ring beams can have enough bearing capacity to support deformation and settlement of the soil body around; meanwhile, the steel support is adopted to support and stabilize the stress of the excavated building foundation pit in the vertical and horizontal directions, and the overall stability of the building foundation pit is improved. Firstly stopping excavation at a position 1m away from the bottom of the designed building foundation pit, detecting the foundation bearing capacity of the bottom of the building foundation pit, and judging whether the bearing capacity meets the design requirement or not, if not, adopting a tamping mode to tamping soil body of the bottom of the building foundation pit excavated at the position until the designed bearing capacity allowable range; and then continuously excavating downwards to the height position of 20cm at the bottom of the designed building foundation pit, excavating to the bottom of the designed building foundation pit by adopting a small-sized machine with small manpower or disturbance, monitoring the soil deformation and sedimentation at the bottom of the foundation pit every 2 hours, and observing the overall stability of the building foundation pit.
Further, paying off a designed building elevator shaft at the position of the excavated building foundation pit, paying off an elevator shaft excavation area according to the design requirement, manually excavating downwards for 20cm, avoiding the integral disturbance of the soil body at the bottom of the building foundation pit, wherein the length and the width of the elevator shaft excavation area are larger than those of the elevator shaft, and the larger area is used as a working platform for excavating the elevator shaft downwards; a circle of pit point water reducing pipes are distributed around the downwards excavated elevator foundation pit well excavation area, and the bottom ends of the pit point water reducing pipes are lower than the pit bottoms of the elevator foundation pit wells designed to be excavated, so that water in the excavated elevator foundation pit wells is guaranteed to be lowered below the pit bottoms;
then, according to the requirement of design, carry out the slope excavation to elevator foundation ditch well excavation region, or excavate the while and strut, excavate to the hole bottom 20cm high position of design elevator foundation ditch well, artifical excavation to elevator foundation ditch well hole bottom, excavate a sump pit that is lower than the hole bottom of elevator foundation ditch well in one side at elevator foundation ditch well hole bottom again, through the mode with the foundation ditch drainage, the water of discharge sump pit. During the construction, the excavated soil body and the time transport are output to the building foundation pit in the elevator foundation pit well excavated downwards; meanwhile, the elevator foundation pit shaft is excavated, the supporting is carried out at the same time, and the monitoring frequency of soil around the elevator foundation pit shaft is enhanced; meanwhile, the water pit is excavated in a small-sized mechanical or manual excavation mode, and the excavated water pit needs to be met; the water collecting pit is not less than 50cm away from the periphery of the pit bottom of the elevator foundation pit well, and the pit bottom of the water collecting pit is lower than the pit bottom of the elevator foundation pit well by not less than 50cm; and the water in the water pit is pumped out and discharged, and a circle of well point dewatering is distributed around the water pit, so that the local dewatering is carried out on the excavated elevator foundation pit well, the workload and the construction flow of dewatering and discharging are reduced, and the construction time and the cost are saved.
Further, according to the requirements of construction, after the soil bearing capacity of the excavation area of the elevator foundation pit well and the pit bottom soil bearing capacity of the building foundation pit are proved to be qualified, pouring the pit bottom cushion layer of the elevator foundation pit well, paving waterproof coiled materials, binding the steel bars of the elevator foundation pit well later, binding the steel bars of the working platform of the elevator foundation pit well and the steel bars of the elevator foundation pit well into a whole, and pre-burying the binding vertical connecting steel bars in the vertical direction of the steel bars of the working platform of the elevator foundation pit well. In the construction process, the strength grade of concrete adopted by the poured bottom cushion layer of the elevator foundation pit well is not less than C20, and the steel bars of the side wall of the elevator foundation pit well and the steel bars of the working platform of the elevator foundation pit well are prefabricated and integrally formed; the bottom ends of the vertical connecting steel bars are connected to the steel bars of the working platform of the elevator foundation pit shaft in a welding mode; the embedded vertical connecting steel bars are used as post-pouring strip connecting steel bars and are connected with the steel bars of the building foundation pit bottom plate, so that the integrity is improved.
And after the reinforcement of the excavation area of the whole elevator foundation pit well is completed and accepted, supporting a template, taking out a drain pipe in a water collecting pit at the bottom of the elevator foundation pit well in time, pouring concrete, and allowing the vertical connecting reinforcement to be higher than the poured concrete in the excavation area of the elevator foundation pit well. In the construction process, the layered pouring mode is adopted, the steel bars of the bottom plate of the elevator pit are poured at first, concrete pouring is carried out on the side wall of the elevator pit before the concrete of the bottom plate of the elevator pit is initially set, the poured side wall concrete of the elevator pit and the concrete of the bottom plate of the elevator pit are integrally poured and formed, the construction and the treatment of joints are reduced, the integrity is improved, the waterproof performance is better, the construction flow operation is reduced, and the construction cost and time are saved.
And then, after the concrete curing of the whole elevator foundation pit well area is qualified, constructing a cushion layer of the building foundation pit bottom plate, paving a layer of waterproof coiled material above the cushion layer of the building foundation pit bottom plate, extending the waterproof coiled material paved above the cushion layer of the building foundation pit bottom plate to be paved above the concrete of the poured elevator foundation pit well, pressing the waterproof coiled material paved above the concrete of the poured elevator foundation pit well below the waterproof coiled material paved above the cushion layer of the building foundation pit bottom plate, and carrying out hot melting connection treatment. In the construction process, waterproof coating is sprayed on the positions, paved above the cushion layer of the foundation pit bottom plate, of the waterproof coiled materials through the vertical connecting steel bars, so that the waterproof performance of the joint joints is improved, and the construction treatment of the joint joints is reduced, therefore, the construction process can be saved, the construction cost and time can be saved, and the integrity and the waterproof performance can be improved.
And then binding building foundation pit bottom plate reinforcing steel bars above the waterproof coiled materials above the paved whole building foundation pit bottom plate cushion layer, and performing concrete pouring on the building foundation pit bottom plate after acceptance inspection is qualified. In construction, the vertical connecting steel bars are connected with the bottom plate steel bars of the building foundation pit, the vertical connecting steel bars are horizontally reinforced and connected with the bottom plate steel bars of the building foundation pit through the horizontal connecting steel bars, and the connecting positions are subjected to rust prevention treatment, so that the integrity and the waterproofness are improved. According to the construction method, the local precipitation is adopted for the elevator foundation pit shaft in consideration of cost and overall structural property, so that the construction workload is reduced, the construction cost is reduced, and the construction time is saved; meanwhile, the construction method connects the elevator foundation pit well and the foundation construction into a whole, reduces the joint treatment flow, ensures the integrity and the waterproofness, and improves the quality of the foundation construction.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the embodiments in the above description, and various simple modifications can be made to the technical solutions of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention. In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further. Furthermore, the foregoing description of the preferred embodiment of the invention is provided for the purpose of limiting the invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention; meanwhile, any combination of various embodiments of the present invention can be made without departing from the spirit of the present invention, which should also be regarded as the disclosure of the present invention.
Claims (8)
1. The construction method of the elevator foundation pit well is characterized by comprising the following construction steps:
s1, measuring and paying off the position of a building foundation pit, and arranging a circle of well point downcomer around the position of the foundation pit, wherein the bottom end of the well point downcomer is lower than the pit bottom of the building foundation pit designed to be excavated;
s2, carrying out slope-releasing excavation on the building foundation pit according to design requirements, supporting while excavating, excavating to a position 20cm high from the bottom of the designed building foundation pit, manually excavating to the building foundation pit, and manually excavating drainage ditches around the edge of the building foundation pit around the building foundation pit;
s3, paying off an elevator foundation pit excavation area at the position of the designed building elevator pit according to the design requirement, then manually excavating downwards for 20cm, wherein the length and the width of the elevator foundation pit excavation area are larger than those of the elevator foundation pit, the enlarged area is used as a working platform for excavating the elevator foundation pit downwards, a circle of pit water reducing pipes are distributed around the elevator foundation pit excavation area excavated downwards, and the bottom ends of the pit water reducing pipes are lower than the pit bottoms of the elevator foundation pit excavated by the design;
s4, carrying out slope excavation or supporting while excavating an elevator foundation pit well excavation area according to the design requirement, excavating to the designed height position of 20cm of the pit bottom of the elevator foundation pit well, manually excavating to the pit bottom of the elevator foundation pit well, excavating a water collecting pit lower than the pit bottom of the elevator foundation pit well at one side of the pit bottom of the elevator foundation pit well, and draining water of the water collecting pit in a foundation pit drainage mode;
s5, after the soil bearing capacity of the excavation area of the elevator foundation pit well and the pit bottom soil bearing capacity of the building foundation pit are checked and accepted to meet the requirements, pouring an elevator foundation pit bottom cushion layer, paving waterproof coiled materials, binding elevator foundation pit well steel bars, binding the steel bars of the working platform of the elevator foundation pit well and the elevator foundation pit well steel bars into a whole, and pre-burying binding vertical connecting steel bars in the vertical direction of the steel bars of the working platform of the elevator foundation pit well;
s6, after binding of the steel bars of the whole elevator foundation pit well excavation area is completed and acceptance is qualified, erecting a template, taking out a drain pipe in a water collecting pit at the bottom of the elevator foundation pit well in time, pouring concrete, and enabling vertical connecting steel bars to be higher than the poured concrete in the elevator foundation pit well excavation area;
s7, after the concrete in the whole elevator foundation pit well area is cured to be qualified, constructing a bedding layer of a building foundation pit bottom plate, paving a layer of waterproof coiled material above the bedding layer of the building foundation pit bottom plate, extending the waterproof coiled material paved above the bedding layer of the building foundation pit bottom plate above the concrete of the poured elevator foundation pit well, pressing the waterproof coiled material paved above the concrete of the poured elevator foundation pit well below the waterproof coiled material paved above the bedding layer of the building foundation pit bottom plate, and carrying out hot melting connection treatment;
s8, binding building foundation pit bottom plate reinforcing steel bars above the waterproof coiled materials above the paved whole building foundation pit bottom plate cushion layer, and performing concrete pouring on the building foundation pit bottom plate after acceptance inspection is qualified.
2. The method according to claim 1, wherein in S1, a water interception ditch is constructed on the outer ring of the pit downcomer disposed around the building pit.
3. The method for constructing an elevator pit shaft according to claim 2, wherein in the step S2, when the building pit is excavated on a slope, the step excavation is performed with a gradient greater than 1:5, the width of the step reservation platform is greater than 2m, and the excavated soil body is directly transported to the building pit or is piled up at a position far from the intercepting ditch by 2 m;
in the step S2, after the building foundation pit is manually excavated to the position of the building foundation pit, the bearing capacity of the building foundation pit is checked, and the next construction can be performed after the building foundation pit is qualified.
4. The construction method of an elevator pit shaft according to claim 1, wherein in S4, the excavated soil body and the time output building pit are in the elevator pit shaft excavated downwards;
meanwhile, the elevator foundation pit shaft is excavated, the supporting is carried out at the same time, and the monitoring frequency of soil around the elevator foundation pit shaft is enhanced;
the pit is not less than 50cm away from the periphery of the pit bottom of the elevator foundation pit well, and the pit bottom of the pit is lower than the pit bottom of the elevator foundation pit well by not less than 50cm.
5. The construction method of the elevator pit shaft according to claim 1, wherein in the step S5, the strength grade of concrete adopted by the poured elevator pit shaft bottom cushion layer is not less than C20, and the steel bars of the side wall of the elevator pit shaft and the steel bars of the working platform of the elevator pit shaft are prefabricated and integrally formed;
the bottom of vertical connecting reinforcement passes through welded mode, connects on elevator foundation ditch well's work platform's reinforcing bar.
6. The construction method of an elevator pit shaft according to claim 1, wherein in S6, a layered casting method is adopted, wherein first, steel bars of a bottom plate of the elevator pit shaft are cast, and concrete casting is performed on the side wall of the elevator pit shaft before the concrete of the bottom plate of the elevator pit shaft is initially set.
7. The construction method of an elevator pit shaft according to claim 1, wherein in S7, the waterproof coating is sprayed on the waterproof coiled material laid on the cushion layer of the foundation pit floor via the position of the vertical connecting steel bar.
8. The method according to claim 7, wherein in S8, the vertical connection bars are connected to the bottom plate bars of the building foundation pit, the vertical connection bars are horizontally reinforced and connected to the bottom plate bars of the building foundation pit by the horizontal connection bars, and the connection positions are all subjected to rust-proof treatment.
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| CN113373963A (en) * | 2021-06-08 | 2021-09-10 | 中国十七冶集团有限公司 | Drainage structure for water collection pit and elevator foundation pit and construction method |
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| EP2503061A1 (en) * | 2008-01-28 | 2012-09-26 | Darin Kruse | Apparatus and Methods for Underground Structures and Construction Thereof |
| CN102162253A (en) * | 2011-05-07 | 2011-08-24 | 山东新城建工股份有限公司 | Precipitation construction method employing pipe embedding in deep foundation pits |
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