CN113338340A - Reverse construction method for vertical shaft ensuring normal use of existing pipeline - Google Patents
Reverse construction method for vertical shaft ensuring normal use of existing pipeline Download PDFInfo
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- CN113338340A CN113338340A CN202110843353.8A CN202110843353A CN113338340A CN 113338340 A CN113338340 A CN 113338340A CN 202110843353 A CN202110843353 A CN 202110843353A CN 113338340 A CN113338340 A CN 113338340A
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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
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
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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
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
Abstract
The invention discloses a reverse construction method of a vertical shaft for ensuring normal use of the existing pipeline, which comprises the steps of leveling a field, paying off, well fixing sideline, locking ring and next section of well protecting wall earthwork excavation, locking ring and first section of well protecting wall steel bar binding, locking ring and first section of well protecting wall template installation, locking ring and first section of well protecting wall concrete pouring, second section of well protecting wall earthwork excavation and cleaning well protecting wall, second section of well protecting wall steel bar net manufacturing installation, second section template installation and support erection, second section of well protecting wall concrete pouring, secondary feeding and measuring elevation and shaft bottom cross axis on well protecting wall, third section repeating first section procedure to second section from bottom to top of well depth, removing shaft bottom virtual soil, pouring shaft bottom concrete cushion layer, binding last section of well protecting wall and bottom plate steel bar, pouring last section of well protecting wall and bottom plate concrete and protecting existing pipeline in construction process. The invention is suitable for the construction engineering of the newly-built sewage vertical shaft which is limited by factors such as complex underground pipelines, incapability of moving and changing the existing pipelines, limited construction site and the like.
Description
Technical Field
The invention relates to the technical field of vertical shaft construction, in particular to a vertical shaft reverse construction method for ensuring normal use of an existing pipeline.
Background
With the rapid development of cities, vehicles are increasing, roads in the range of old commercial areas have the situation that the demands of people cannot be met, and vehicle congestion frequently occurs, so that the reconstruction and the upgrade of the roads are more and more common. In the road reconstruction, expansion and upgrading process, the sewage pipeline on the original line is inevitably influenced, and the new and reconstruction of the sewage pipeline is inevitable. Due to the complexity of underground pipelines in old commercial areas, the traditional vertical shaft construction process cannot ensure that the sewage inspection well and later-stage pipe jacking construction can be completed on the premise that the existing underground pipelines are not damaged.
For a commercial core area of a city, particularly an old city area, underground pipelines are complicated and complicated, communication and coordination with related property units are realized during construction, and a plurality of pipelines such as heating power, gas, electric power and the like cannot be changed, so that the construction production task is completed, the construction quality needs to be ensured while the pipelines in the current situation are protected from being damaged. The commercial core area of the old city is adjacent to a large number of buildings, the existing pipelines are complicated and underground, the traffic flow of roads is large, temporary communication of constructed sewage wells can greatly affect current traffic, and how to complete the construction of the vertical wells and protect the current pipelines becomes a construction difficulty.
Disclosure of Invention
Aiming at the defects in the background art, the invention provides a reverse construction method for ensuring the normal use of the existing pipeline for a vertical shaft, which solves the technical problem of how to build the vertical shaft in the complicated old city commercial core area of the underground pipeline without influencing the existing pipeline.
The technical scheme of the invention is realized as follows: a reverse construction method for a vertical shaft ensuring normal use of an existing pipeline comprises the following steps: the method comprises the following steps of site leveling, paying off, well side line positioning, locking ring and next section of well retaining wall earthwork excavation, locking ring and first section of well retaining wall steel bar binding, locking ring and first section of well retaining wall template installation, locking ring and first section of well retaining wall concrete pouring, second section of well retaining wall earthwork excavation and well retaining wall cleaning, second section of well retaining wall steel bar net manufacturing and installation, second section template installation and support erection, second section of well retaining wall concrete pouring, secondary throwing of elevation and shaft bottom cross axis on the well retaining wall, third section repeating the first section procedure to the second section from the bottom to the last section of well depth, removing shaft bottom soil deficiency, pouring concrete cushion layer, binding the last section of well retaining wall and bottom plate steel bar, and pouring the last section of well retaining wall and bottom plate concrete; during construction, the protection of the existing pipeline comprises:
1) the gas pipeline is manually excavated until the pipeline is exposed, and the pipeline is protected by using a suspension construction process;
2) manually mixing fine stone concrete to protect the water supply and drainage pipelines by encapsulation, and simultaneously carrying out suspension construction process protection on the pipelines in the construction process;
3) when the tunnel is constructed above the thermal pipeline, primary support C25 concrete is appropriately encrypted with the grid spacing, a double-layer reinforcing mesh is adopted, and a small leading conduit is arranged at 180 degrees to protect the existing pipeline;
4) the cable television pipeline is buried shallowly, a cable groove with the width of 40cm and the depth of 50cm is built on one side close to a curb stone of a sidewalk during construction, a reinforced concrete cover plate is covered on the cable groove, and the cable groove is buried together with military cables.
The existing pipeline is constructed by adopting a suspension method:
1) before construction, grouting and reinforcing soil between an underground pipeline and a construction area;
2) manual excavation is adopted on two sides of the pipeline, and any mechanical excavation is strictly forbidden;
3) excavating in sections and suspending in sections in sequence, so that each suspending point fully bears the weight of the pipeline, and gradually transferring the weight to the I-steel;
4) the miscellaneous filling soil on the two sides of the pipeline is cleaned, so that the load weight of the I-shaped steel is reduced as much as possible;
5) after the suspension is finished, winding a circle of sponge and tin foil paper outside the pipeline to prevent the influence of sunshine insolation and weathering;
6) and after the construction is finished, grouting, filling and reinforcing the loose soil on the pipe wall or the well wall and the gap.
Before the field is leveled, construction preparation is firstly carried out, and the following contents are ensured:
the road, temporary electricity and water pipelines on the construction site are smooth, and the construction site has the entrance construction conditions;
greening and other accessories in the construction floor area are removed in place, underground pipeline pipes are found out, the above-ground and underground barriers are cleaned, the construction area barrier is installed, and the communication is guaranteed;
measuring the crossed piles, checking the control points, the coordinate points and the level points, and completing pile fastening and pile repairing;
various pipelines are tested without errors;
various devices are checked, and materials are tested to be qualified;
setting settlement observation points of surrounding buildings and structures before excavation, and making original records;
according to design requirements, measuring a well position central line according to a picture, burying a positioning pile, and strictly operating according to measurement rules; and (5) performing construction site enclosure.
When construction of a lock collar opening and a first section of well retaining wall is carried out, the construction of the lock collar opening is finished on the ground surface, earth excavation construction is started after paying off and positioning, 1500mm is excavated downwards on the original site, d + t +2800mm is excavated in the horizontal direction, d is the inner diameter of a support structure, t is the wall thickness of the support structure, 1400mm lock collar wing plates are respectively reserved on two sides of a foundation pit, excavated earth is piled on the outer side of the foundation pit, the distance between a pile slope foot and a groove edge is 2.0m, the pile height is not more than 1.5m, and the pile slope is not steeper than a natural angle of repose; after manual leveling, constructing a 100mm rear C20 concrete cushion layer within the range of 1400mm on the two sides of the foundation pit, binding a locking collar and a first section of well wall protecting steel bars after the cushion layer is finally set, wherein lap joint lengths are reserved for the well wall protecting and the binding locking collar steel bars so as to connect the lower part with a well body; the inner side is vertically formed into a steel template, a stable inner support is adopted for supporting, mortar is smeared on the outer side by using an earth model as a template, and a funnel method is adopted when concrete is poured; meanwhile, a 30cm high water retaining wall is arranged at the position of the shaft mouth to prevent rainwater from flowing into the shaft; and after the shaft locking ring is poured and reaches the design strength, carrying out the excavation of the well retaining wall.
When well retaining wall excavation and concrete construction are carried out, the strength of the locking collar reaches more than 80% of the design requirement, the well body soil body is excavated downwards, the excavation adopts the steps of firstly excavating in the well and then excavating around the well, and the distance of each excavation is not more than 1.5 m; the excavation mode adopts a long-wall excavator and manual cooperation, manual excavation and finishing are adopted at the position close to the well protecting wall, and the manual excavation and unearthing mode is carried out by adopting a chain block; binding reinforcing steel bars in time after each layer of excavation is finished; after the acceptance is qualified, template construction is carried out in time, and concrete is poured in time; after the foundation pit is excavated to the designed bottom elevation, the final protective wall of the well and the bottom plate are constructed simultaneously, the integrity of the protective wall and the bottom plate is ensured, construction joints are reduced, and the risk of water leakage is reduced.
When carrying out well dado reinforcement construction occasionally the following main points: (1) the specifications of the steel bars comprise C12, C16, C18, C20 and C22, the steel bars are retested for the physical properties of tensile strength, yield point, elongation and cold bending test according to the specification requirements before entering a field, and the steel bars are used after the performance of the steel bars is determined to meet the specification requirements;
(2) uniformly processing the semi-finished products of the reinforcing steel bars in a reinforcing steel bar processing field, and conveying the semi-finished products of the reinforcing steel bars to a construction site for binding and welding the reinforcing steel bars; (3) all the steel bar joints are welded, the length of single-side lap welding is 10 times of the diameter of the steel bar, and the length of adjacent steel bar lap staggering is 35 times of the diameter of the steel bar;
(4) a pre-buried hole needs to be reserved in the well protecting wall, the pre-buried diameter is 1.2 times of the diameter of the pipeline and is 200mm, the hole is reserved strictly according to design drawings in the binding process of reinforcing steel bars, the reinforcing steel bars at the reserved part of the hole are re-welded by using annular reinforcing steel bars after being cut off, and reinforcing steel bars are arranged around the reserved hole;
(5) the thickness of the well protection wall protective layer is 40mm, and the cushion blocks used by the protective layer are cement mortar cushion blocks with the same label;
(6) the metal wires for binding the steel bars are soft iron wires of No. 20-22, the intersections of all the steel bars are firmly tied by the soft iron wires, and the ends of the soft iron wires are bent into the concrete;
(7) manufacturing the well protecting wall reinforcing steel bars of each layer, wherein the vertical reinforcing steel bars are crossly arranged at least 30cm and 130cm deep into the lower layer, and reserved for connecting the lower layer reinforcing steel bars, the lower layer reinforcing steel bars and the upper layer reserved reinforcing steel bars are connected in a welding mode, and the single-side welding length is ten times of the diameter of the reinforcing steel bars, so that the integrity of the well protecting wall reinforcing steel bars is ensured;
(8) and after the foundation pit is excavated to the designed foundation pit bottom elevation, the last retaining wall reinforcing steel bar and the bottom plate reinforcing steel bar are constructed simultaneously, and the connection is firm.
When the well protection wall template is constructed, the inner template of the well protection wall is completely a shaped steel template, and the surface of the template is smooth and meets the standard requirement; the purlin surrounding keel is made of phi 48 steel pipes, phi 48 steel pipe fasteners are adopted for fastening, the horizontal distance is 45cm, and the vertical distance is 45 cm; the connection between the templates is tight and firm by using the snap fasteners, simultaneously, all the abutted seams and the seams of the templates are embedded one by adopting thickened double faced adhesive tapes to prevent slurry leakage, and after the templates are erected, a proprietor and a supervision engineer are required to perform acceptance inspection, wherein the acceptance inspection is mainly performed on the items such as plane size, section size, flatness, wall through holes and the like. The square wood is vertically placed without intervals; the bracket is supported by a steel pipe fastener; measuring and lofting according to the size shown in the drawing; the formwork is installed correctly and stably, the step distance of the support erection is 60cm, the horizontal transverse distance and the longitudinal distance are 60cm, and steel pipe inclined struts are additionally arranged according to the actual situation on site to ensure that the formwork can bear the lateral pressure generated during concrete pouring and vibrating and is not influenced by weather; the template at the enlarged footing is arranged at an angle of 120 degrees with the vertical template, the enlarged footing template is higher than the bottom of the upper protective wall, the aperture of the pouring hole is 200mm, and the steel pipe is adopted for firm support; when the formwork is erected, the formworks are uniformly and straightly arranged, so that the concrete surface at the joint is flat and uniform; the seam design of the template is coordinated with the appearance of the structure, so that the vertical and plane seams are kept straight; the template can not be directly connected with the structural steel bar so as to avoid deformation and dislocation of the template; one end of the pull rod extending deeply is welded and fixed with the steel bar; the end part of the bracket is tightly propped against the square timber of the fixed template by adopting a jacking bracket, and the gap is tightly wedged by adopting a wooden wedge; fixing the embedded part or the reserved pipe on the template according to the drawing requirements and the actual surveying position and elevation; before die assembly, cleaning up impurities, accumulated water and dirt on the steel bars in the template; the inner surface of the formwork is coated with a release agent to prevent adhesion with concrete and facilitate removal of the formwork. Before the concrete is poured, removing sawdust, wood shavings, dust, other impurities and stagnant water on the molding surface of the template; before concrete is poured, the positions of the embedded parts and the reserved holes are determined to be firmly installed; when the support and the template are dismantled, the first-assembling and then-disassembling principle is adopted, the support and the template can be dismantled after the structure reaches more than 80% of the design strength, and the next section of well retaining wall earth excavation construction is carried out after the support and the template are dismantled.
During concrete pouring construction, concrete is intensively mixed by adopting a mixing station, a concrete transport vehicle transports the concrete, a crane bucket enters a mold, and construction requirements and cautions are as follows:
before pouring, checking the support, the template, the steel bar and the embedded part, wherein if the template has a gap, the template needs to be tightly filled, and the inner surface of the template needs to be coated with a release agent;
before pouring, checking the uniformity and slump of concrete;
for a scaffold used for pouring concrete, personnel and a material tool can conveniently move up and down, and the safety must be ensured;
the concrete is poured in layers according to the thickness, the sequence and the direction, the upper layer concrete is poured before the lower layer concrete is initially set or can be remolded, and the concrete layered pouring thickness is not more than 30 cm;
when concrete is poured, an inserted vibrating rod is adopted for tamping, and the vibrating is in accordance with the following standards:
when the plug-in vibrating rod is used, the moving distance is not more than 1.5 times of the acting radius of the vibrating rod; keeping a distance of 5-10 cm with the side mold; inserting 5-10 cm of lower layer concrete; vibrating and extracting the vibrating rod slowly after each vibrating part is finished; the vibrating rod is prevented from colliding with the template, the steel bar and other embedded parts;
for each vibration part, the vibration is carried out until the concrete at the part is compact; the compact mark is that the concrete stops sinking, no air bubbles emerge, the surface is flat and the concrete is overflowed;
the concrete pouring is carried out continuously, for example, the concrete pouring is interrupted due to reasons, and the interruption time is less than the initial setting time or the remolding time of the front layer concrete; the allowable interruption time is determined by tests, and if the allowable interruption time is exceeded, quality assurance measures or treatment according to a working seam are required;
during the concrete pouring process, attention should be paid to the observation:
observing whether the arranged embedded bolt and the preformed hole move at any time, and correcting in time if the displacement is found;
the forming equipment of the preformed hole is pulled and loosened in time;
paying attention to the supporting conditions of the template, the bracket and the like in the pouring process, arranging special people for checking, if deformation exists, displacement or subsidence needs to be immediately corrected and reinforced, and pouring can be continued after treatment;
during or after the pouring process, if the surface of the concrete is drained, measures are taken to remove water under the condition of not disturbing the poured concrete if the surface of the concrete is drained too much; when concrete is continuously poured, reasons need to be found out, measures are taken, and bleeding is reduced;
after concrete pouring is finished, finishing and trowelling the exposed surface of the concrete in time, and performing secondary press polishing or napping after sizing;
and after the concrete reaches a certain strength, covering, preserving heat and maintaining in time.
The invention comprises the connection of a locking ring and a retaining wall, the connection of an upper well retaining wall and a lower well retaining wall, and the connection of a bottom plate and the well retaining wall; when the fore shaft ring is connected with the retaining wall, a throat ring beam and the upper part of the retaining wall are constructed simultaneously; when the upper section well retaining wall is connected with the lower well retaining wall, (1) the reserved steel bars of the upper part vertical well retaining wall are cleaned before the steel bars are bound, and impurities such as undisturbed soil and the like are not mixed on the surface; (2) chiseling the connecting part of the vertical shaft protecting wall to enable stones to leak outside the vertical shaft protecting wall; (3) a funnel-shaped pouring gate with the height of 30cm is arranged at the upper part of the template, the lower part of concrete is poured firstly, when the concrete is poured to the sealing height, the gap of the concrete is tightly filled by means of pouring pressure and a vibrator, and after the concrete of the funnel part is hardened, the surface is chiseled and leveled; when the bottom plate is connected with the well protection wall, the bottom plate is bound and connected with the reserved ribs of the well protection wall; controlling the concrete slump at 12 +/-2 cm; the primary concrete pouring height is 30cm, and the concrete around the primary concrete pouring height uniformly rises; covering the concrete within 12 hours after the concrete pouring is finished, and carrying out wet curing for more than 14 days.
When the protecting wall and the bottom plate of the last section of well are constructed, after the foundation pit is excavated to the designed bottom elevation, the last section of well wall and the bottom plate are constructed simultaneously, a cushion layer is poured, and reinforcing steel bars of the bottom plate are bound to be connected with reinforcing steel bars of the last section of well wall, so that the segmented structures are connected into a whole; the formwork frame is erected on the bottom plate to be elevated, a bottom plate concrete pouring space is reserved, after the concrete is initially set, the formwork frame body is detached, holes formed by the formwork frame body are chiseled and shaved, and the poured concrete is repaired to be smooth.
The method comprises the steps of excavating soil bodies in a well firstly and then around the well, clearing a construction space, binding a locking collar beam and a first section of well wall reinforcing steel bar, inserting vertical main reinforcing steel bars of the well wall into soil bodies of a lower layer by 0.3-1.3 m in a staggered manner, clearing miscellaneous soil attached to the reinforcing steel bars during lower layer construction and welding; erecting the template, reserving a 20cm ﹡ 20cm perfusion hole at the upper part of the template, and performing concrete construction in a layered pouring mode, wherein the strength of the concrete is C30. In the construction process, when the existing pipeline is in the current situation, the existing pipeline is encapsulated into a vertical shaft structure, the pipeline is protected by adopting a profile steel suspension and foundation reinforcement method, reinforcing ribs are distributed on the periphery of the pipeline, and a deformation space of 5cm is reserved for the open caisson according to the diameter of the existing pipeline and the diameter d +10cm of the reserved hole pipeline, so that the pipeline is not influenced by the open caisson, and damage or deformation is avoided. The method is suitable for newly-built sewage shaft construction engineering which is restricted by factors such as non-excavation engineering shafts, complex underground pipelines, incapability of moving and changing existing pipelines, limited construction site and the like, and is suitable for newly-built sewage shaft engineering which is adjacent to a building in many places and has extremely narrow surrounding construction areas. The invention adopts the layered construction from top to bottom and applies the locking collar beam on the outer side of the well wall, thereby enhancing the integral stability of the structure and ensuring safe and reliable construction. According to the invention, through a method of open caisson reverse operation, when the existing pipeline is met, a proper protection method is adopted according to the type of the existing pipeline, so that the effect of ensuring that the normal use of the existing pipeline does not influence the construction is achieved. Compared with the traditional open caisson construction method, the method reduces the using amount of the template, accelerates the construction speed and has obvious economic benefit.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
A reverse construction method for a vertical shaft ensuring normal use of an existing pipeline comprises the following steps: the method comprises the following steps of site leveling, paying off, well side line positioning, locking ring and next section of well retaining wall earthwork excavation, locking ring and first section of well retaining wall steel bar binding, locking ring and first section of well retaining wall template installation, locking ring and first section of well retaining wall concrete pouring, second section of well retaining wall earthwork excavation and well retaining wall cleaning, second section of well retaining wall steel bar net manufacturing and installation, second section template installation and support erection, second section of well retaining wall concrete pouring, secondary throwing of elevation and shaft bottom cross axis on the well retaining wall, third section repeating the first section procedure to the second section from the bottom to the last section of well depth, removing shaft bottom soil deficiency, pouring concrete cushion layer, binding the last section of well retaining wall and bottom plate steel bar, and pouring the last section of well retaining wall and bottom plate concrete; during construction, the protection of the existing pipeline comprises:
1) the gas pipeline is manually excavated until the pipeline is exposed, and the pipeline is protected by using a suspension construction process;
2) manually mixing fine stone concrete to protect the water supply and drainage pipelines by encapsulation, and simultaneously carrying out suspension construction process protection on the pipelines in the construction process;
3) when the tunnel is constructed above the thermal pipeline, primary support C25 concrete is appropriately encrypted with the grid spacing, a double-layer reinforcing mesh is adopted, and a small leading conduit is arranged at 180 degrees to protect the existing pipeline;
4) the cable television pipeline is buried shallowly, a cable groove with the width of 40cm and the depth of 50cm is built on one side close to a curb stone of a sidewalk during construction, a reinforced concrete cover plate is covered on the cable groove, and the cable groove is buried together with military cables.
The existing pipeline is constructed by adopting a suspension method:
1) before construction, grouting and reinforcing soil between an underground pipeline and a construction area;
2) manual excavation is adopted on two sides of the pipeline, and any mechanical excavation is strictly forbidden;
3) excavating in sections and suspending in sections in sequence, so that each suspending point fully bears the weight of the pipeline, and gradually transferring the weight to the I-steel;
4) the miscellaneous filling soil on the two sides of the pipeline is cleaned, so that the load weight of the I-shaped steel is reduced as much as possible;
5) after the suspension is finished, winding a circle of sponge and tin foil paper outside the pipeline to prevent the influence of sunshine insolation and weathering;
6) and after the construction is finished, grouting, filling and reinforcing the loose soil on the pipe wall or the well wall and the gap.
Other specific construction points are as follows:
before the field is leveled, construction preparation is firstly carried out, and the following contents are ensured:
the road, temporary electricity and water pipelines on the construction site are smooth, and the construction site has the entrance construction conditions;
greening and other accessories in the construction floor area are removed in place, underground pipeline pipes are found out, the above-ground and underground barriers are cleaned, the construction area barrier is installed, and the communication is guaranteed;
measuring the crossed piles, checking the control points, the coordinate points and the level points, and completing pile fastening and pile repairing;
various pipelines are tested without errors;
various devices are checked, and materials are tested to be qualified;
setting settlement observation points of surrounding buildings and structures before excavation, and making original records;
according to design requirements, measuring a well position central line according to a picture, burying a positioning pile, and strictly operating according to measurement rules; and (5) performing construction site enclosure.
When construction of a lock collar opening and a first section of well retaining wall is carried out, the construction of the lock collar opening is finished on the ground surface, earth excavation construction is started after paying off and positioning, 1500mm is excavated downwards on the original site, d + t +2800mm is excavated in the horizontal direction, d is the inner diameter of a support structure, t is the wall thickness of the support structure, 1400mm lock collar wing plates are respectively reserved on two sides of a foundation pit, excavated earth is piled on the outer side of the foundation pit, the distance between a pile slope foot and a groove edge is 2.0m, the pile height is not more than 1.5m, and the pile slope is not steeper than a natural angle of repose; after manual leveling, constructing a 100mm rear C20 concrete cushion layer within the range of 1400mm on the two sides of the foundation pit, binding a locking collar and a first section of well wall protecting steel bars after the cushion layer is finally set, wherein lap joint lengths are reserved for the well wall protecting and the binding locking collar steel bars so as to connect the lower part with a well body; the inner side is vertically formed into a steel template, a stable inner support is adopted for supporting, mortar is smeared on the outer side by using an earth model as a template, and a funnel method is adopted when concrete is poured; meanwhile, a 30cm high water retaining wall is arranged at the position of the shaft mouth to prevent rainwater from flowing into the shaft; and after the shaft locking ring is poured and reaches the design strength, carrying out the excavation of the well retaining wall.
When well retaining wall excavation and concrete construction are carried out, the strength of the locking collar reaches more than 80% of the design requirement, the well body soil body is excavated downwards, the excavation adopts the steps of firstly excavating in the well and then excavating around the well, and the distance of each excavation is not more than 1.5 m; the excavation mode adopts a long-wall excavator and manual cooperation, manual excavation and finishing are adopted at the position close to the well protecting wall, and the manual excavation and unearthing mode is carried out by adopting a chain block; binding reinforcing steel bars in time after each layer of excavation is finished; after the acceptance is qualified, template construction is carried out in time, and concrete is poured in time; after the foundation pit is excavated to the designed bottom elevation, the final protective wall of the well and the bottom plate are constructed simultaneously, the integrity of the protective wall and the bottom plate is ensured, construction joints are reduced, and the risk of water leakage is reduced.
When carrying out well dado reinforcement construction occasionally the following main points: (1) the specifications of the steel bars comprise C12, C16, C18, C20 and C22, the steel bars are retested for the physical properties of tensile strength, yield point, elongation and cold bending test according to the specification requirements before entering a field, and the steel bars are used after the performance of the steel bars is determined to meet the specification requirements;
(2) uniformly processing the semi-finished products of the reinforcing steel bars in a reinforcing steel bar processing field, and conveying the semi-finished products of the reinforcing steel bars to a construction site for binding and welding the reinforcing steel bars; (3) all the steel bar joints are welded, the length of single-side lap welding is 10 times of the diameter of the steel bar, and the length of adjacent steel bar lap staggering is 35 times of the diameter of the steel bar;
(4) a pre-buried hole needs to be reserved in the well protecting wall, the pre-buried diameter is 1.2 times of the diameter of the pipeline and is 200mm, the hole is reserved strictly according to design drawings in the binding process of reinforcing steel bars, the reinforcing steel bars at the reserved part of the hole are re-welded by using annular reinforcing steel bars after being cut off, and reinforcing steel bars are arranged around the reserved hole;
(5) the thickness of the well protection wall protective layer is 40mm, and the cushion blocks used by the protective layer are cement mortar cushion blocks with the same label;
(6) the metal wires for binding the steel bars are soft iron wires of No. 20-22, the intersections of all the steel bars are firmly tied by the soft iron wires, and the ends of the soft iron wires are bent into the concrete;
(7) manufacturing the well protecting wall reinforcing steel bars of each layer, wherein the vertical reinforcing steel bars are crossly arranged at least 30cm and 130cm deep into the lower layer, and reserved for connecting the lower layer reinforcing steel bars, the lower layer reinforcing steel bars and the upper layer reserved reinforcing steel bars are connected in a welding mode, and the single-side welding length is ten times of the diameter of the reinforcing steel bars, so that the integrity of the well protecting wall reinforcing steel bars is ensured;
(8) and after the foundation pit is excavated to the designed foundation pit bottom elevation, the last retaining wall reinforcing steel bar and the bottom plate reinforcing steel bar are constructed simultaneously, and the connection is firm.
When the well protection wall template is constructed, the inner template of the well protection wall is completely a shaped steel template, and the surface of the template is smooth and meets the standard requirement; the purlin surrounding keel is made of phi 48 steel pipes, phi 48 steel pipe fasteners are adopted for fastening, the horizontal distance is 45cm, and the vertical distance is 45 cm; the connection between the templates is tight and firm by using the snap fasteners, simultaneously, all the abutted seams and the seams of the templates are embedded one by adopting thickened double faced adhesive tapes to prevent slurry leakage, and after the templates are erected, a proprietor and a supervision engineer are required to perform acceptance inspection, wherein the acceptance inspection is mainly performed on the items such as plane size, section size, flatness, wall through holes and the like. The square wood is vertically placed without intervals; the bracket is supported by a steel pipe fastener; measuring and lofting according to the size shown in the drawing; the formwork is installed correctly and stably, the step distance of the support erection is 60cm, the horizontal transverse distance and the longitudinal distance are 60cm, and steel pipe inclined struts are additionally arranged according to the actual situation on site to ensure that the formwork can bear the lateral pressure generated during concrete pouring and vibrating and is not influenced by weather; the template at the enlarged footing is arranged at an angle of 120 degrees with the vertical template, the enlarged footing template is higher than the bottom of the upper protective wall, the aperture of the pouring hole is 200mm, and the steel pipe is adopted for firm support; when the formwork is erected, the formworks are uniformly and straightly arranged, so that the concrete surface at the joint is flat and uniform; the seam design of the template is coordinated with the appearance of the structure, so that the vertical and plane seams are kept straight; the template can not be directly connected with the structural steel bar so as to avoid deformation and dislocation of the template; one end of the pull rod extending deeply is welded and fixed with the steel bar; the end part of the bracket is tightly propped against the square timber of the fixed template by adopting a jacking bracket, and the gap is tightly wedged by adopting a wooden wedge; fixing the embedded part or the reserved pipe on the template according to the drawing requirements and the actual surveying position and elevation; before die assembly, cleaning up impurities, accumulated water and dirt on the steel bars in the template; the inner surface of the formwork is coated with a release agent to prevent adhesion with concrete and facilitate removal of the formwork. Before the concrete is poured, removing sawdust, wood shavings, dust, other impurities and stagnant water on the molding surface of the template; before concrete is poured, the positions of the embedded parts and the reserved holes are determined to be firmly installed; when the support and the template are dismantled, the first-assembling and then-disassembling principle is adopted, the support and the template can be dismantled after the structure reaches more than 80% of the design strength, and the next section of well retaining wall earth excavation construction is carried out after the support and the template are dismantled.
During concrete pouring construction, concrete is intensively mixed by adopting a mixing station, a concrete transport vehicle transports the concrete, a crane bucket enters a mold, and construction requirements and cautions are as follows:
before pouring, checking the support, the template, the steel bar and the embedded part, wherein if the template has a gap, the template needs to be tightly filled, and the inner surface of the template needs to be coated with a release agent;
before pouring, checking the uniformity and slump of concrete;
for a scaffold used for pouring concrete, personnel and a material tool can conveniently move up and down, and the safety must be ensured;
the concrete is poured in layers according to the thickness, the sequence and the direction, the upper layer concrete is poured before the lower layer concrete is initially set or can be remolded, and the concrete layered pouring thickness is not more than 30 cm;
when concrete is poured, an inserted vibrating rod is adopted for tamping, and the vibrating is in accordance with the following standards:
when the plug-in vibrating rod is used, the moving distance is not more than 1.5 times of the acting radius of the vibrating rod; keeping a distance of 5-10 cm with the side mold; inserting 5-10 cm of lower layer concrete; vibrating and extracting the vibrating rod slowly after each vibrating part is finished; the vibrating rod is prevented from colliding with the template, the steel bar and other embedded parts;
for each vibration part, the vibration is carried out until the concrete at the part is compact; the compact mark is that the concrete stops sinking, no air bubbles emerge, the surface is flat and the concrete is overflowed;
the concrete pouring is carried out continuously, for example, the concrete pouring is interrupted due to reasons, and the interruption time is less than the initial setting time or the remolding time of the front layer concrete; the allowable interruption time is determined by tests, and if the allowable interruption time is exceeded, quality assurance measures or treatment according to a working seam are required;
during the concrete pouring process, attention should be paid to the observation:
observing whether the arranged embedded bolt and the preformed hole move at any time, and correcting in time if the displacement is found;
the forming equipment of the preformed hole is pulled and loosened in time;
paying attention to the supporting conditions of the template, the bracket and the like in the pouring process, arranging special people for checking, if deformation exists, displacement or subsidence needs to be immediately corrected and reinforced, and pouring can be continued after treatment;
during or after the pouring process, if the surface of the concrete is drained, measures are taken to remove water under the condition of not disturbing the poured concrete if the surface of the concrete is drained too much; when concrete is continuously poured, reasons need to be found out, measures are taken, and bleeding is reduced;
after concrete pouring is finished, finishing and trowelling the exposed surface of the concrete in time, and performing secondary press polishing or napping after sizing;
and after the concrete reaches a certain strength, covering, preserving heat and maintaining in time.
The invention comprises the connection of a locking ring and a retaining wall, the connection of an upper well retaining wall and a lower well retaining wall, and the connection of a bottom plate and the well retaining wall; when the fore shaft ring is connected with the retaining wall, a throat ring beam and the upper part of the retaining wall are constructed simultaneously; when the upper section well retaining wall is connected with the lower well retaining wall, (1) the reserved steel bars of the upper part vertical well retaining wall are cleaned before the steel bars are bound, and impurities such as undisturbed soil and the like are not mixed on the surface; (2) chiseling the connecting part of the vertical shaft protecting wall to enable stones to leak outside the vertical shaft protecting wall; (3) a funnel-shaped pouring gate with the height of 30cm is arranged at the upper part of the template, the lower part of concrete is poured firstly, when the concrete is poured to the sealing height, the gap of the concrete is tightly filled by means of pouring pressure and a vibrator, and after the concrete of the funnel part is hardened, the surface is chiseled and leveled; when the bottom plate is connected with the well protection wall, the bottom plate is bound and connected with the reserved ribs of the well protection wall; controlling the concrete slump at 12 +/-2 cm; the primary concrete pouring height is 30cm, and the concrete around the primary concrete pouring height uniformly rises; covering the concrete within 12 hours after the concrete pouring is finished, and carrying out wet curing for more than 14 days.
When the protecting wall and the bottom plate of the last section of well are constructed, after the foundation pit is excavated to the designed bottom elevation, the last section of well wall and the bottom plate are constructed simultaneously, a cushion layer is poured, and reinforcing steel bars of the bottom plate are bound to be connected with reinforcing steel bars of the last section of well wall, so that the segmented structures are connected into a whole; the formwork frame is erected on the bottom plate to be elevated, a bottom plate concrete pouring space is reserved, after the concrete is initially set, the formwork frame body is detached, holes formed by the formwork frame body are chiseled and shaved, and the poured concrete is repaired to be smooth.
Nothing in this specification is intended to be exhaustive of all conventional and well known techniques.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A reverse construction method for a vertical shaft ensuring normal use of an existing pipeline is characterized by comprising the following steps:
the method comprises the following steps of site leveling, paying off, well side line positioning, locking ring and next section of well retaining wall earthwork excavation, locking ring and first section of well retaining wall steel bar binding, locking ring and first section of well retaining wall template installation, locking ring and first section of well retaining wall concrete pouring, second section of well retaining wall earthwork excavation and well retaining wall cleaning, second section of well retaining wall steel bar net manufacturing and installation, second section template installation and support erection, second section of well retaining wall concrete pouring, secondary throwing of elevation and shaft bottom cross axis on the well retaining wall, third section repeating the first section procedure to the second section from the bottom to the last section of well depth, removing shaft bottom soil deficiency, pouring concrete cushion layer, binding the last section of well retaining wall and bottom plate steel bar, and pouring the last section of well retaining wall and bottom plate concrete;
during construction, the protection of the existing pipeline comprises:
1) the gas pipeline is manually excavated until the pipeline is exposed, and the pipeline is protected by using a suspension construction process;
2) manually mixing fine stone concrete to protect the water supply and drainage pipelines by encapsulation, and simultaneously carrying out suspension construction process protection on the pipelines in the construction process;
3) when the tunnel is constructed above the thermal pipeline, primary support C25 concrete is appropriately encrypted with the grid spacing, a double-layer reinforcing mesh is adopted, and a small leading conduit is arranged at 180 degrees to protect the existing pipeline;
4) the cable television pipeline is buried shallowly, a cable groove with the width of 40cm and the depth of 50cm is built on one side close to a curb stone of a sidewalk during construction, a reinforced concrete cover plate is covered on the cable groove, and the cable groove is buried together with military cables.
2. The reverse construction method of the vertical shaft for ensuring the normal use of the existing pipeline according to claim 1, which is characterized in that: the existing pipeline is constructed by adopting a suspension method:
1) before construction, grouting and reinforcing soil between an underground pipeline and a construction area;
2) manual excavation is adopted on two sides of the pipeline, and any mechanical excavation is strictly forbidden;
3) excavating in sections and suspending in sections in sequence, so that each suspending point fully bears the weight of the pipeline, and gradually transferring the weight to the I-steel;
4) the miscellaneous filling soil on the two sides of the pipeline is cleaned, so that the load weight of the I-shaped steel is reduced as much as possible;
5) after the suspension is finished, winding a circle of sponge and tin foil paper outside the pipeline to prevent the influence of sunshine insolation and weathering;
6) and after the construction is finished, grouting, filling and reinforcing the loose soil on the pipe wall or the well wall and the gap.
3. The reverse construction method of the vertical shaft for ensuring the normal use of the existing pipeline according to claim 2, which is characterized in that: before the field is leveled, construction preparation is firstly carried out, and the following contents are ensured:
the road, temporary electricity and water pipelines on the construction site are smooth, and the construction site has the entrance construction conditions;
greening and other accessories in the construction floor area are removed in place, underground pipeline pipes are found out, the above-ground and underground barriers are cleaned, the construction area barrier is installed, and the communication is guaranteed;
measuring the crossed piles, checking the control points, the coordinate points and the level points, and completing pile fastening and pile repairing;
various pipelines are tested without errors;
various devices are checked, and materials are tested to be qualified;
setting settlement observation points of surrounding buildings and structures before excavation, and making original records;
according to design requirements, measuring a well position central line according to a picture, burying a positioning pile, and strictly operating according to measurement rules; and (5) performing construction site enclosure.
4. The reverse construction method of the vertical shaft for ensuring the normal use of the existing pipeline according to claim 3, which is characterized in that: when construction of a lock collar opening and a first section of well retaining wall is carried out, the construction of the lock collar opening is finished on the ground surface, earth excavation construction is started after paying off and positioning, 1500mm is excavated downwards on the original site, d + t +2800mm is excavated in the horizontal direction, d is the inner diameter of a support structure, t is the wall thickness of the support structure, 1400mm lock collar wing plates are respectively reserved on two sides of a foundation pit, excavated earth is piled on the outer side of the foundation pit, the distance between a pile slope foot and a groove edge is 2.0m, the pile height is not more than 1.5m, and the pile slope is not steeper than a natural angle of repose; after manual leveling, constructing a 100mm rear C20 concrete cushion layer within the range of 1400mm on the two sides of the foundation pit, binding a locking collar and a first section of well wall protecting steel bars after the cushion layer is finally set, wherein lap joint lengths are reserved for the well wall protecting and the binding locking collar steel bars so as to connect the lower part with a well body; the inner side is vertically formed into a steel template, a stable inner support is adopted for supporting, mortar is smeared on the outer side by using an earth model as a template, and a funnel method is adopted when concrete is poured; meanwhile, a 30cm high water retaining wall is arranged at the position of the shaft mouth to prevent rainwater from flowing into the shaft; and after the shaft locking ring is poured and reaches the design strength, carrying out the excavation of the well retaining wall.
5. A method of reverse construction of a shaft to ensure normal use of an existing pipeline according to any one of claims 1 to 4, characterised in that: when well retaining wall excavation and concrete construction are carried out, the strength of the locking collar reaches more than 80% of the design requirement, the well body soil body is excavated downwards, the excavation adopts the steps of firstly excavating in the well and then excavating around the well, and the distance of each excavation is not more than 1.5 m; the excavation mode adopts a long-wall excavator and manual cooperation, manual excavation and finishing are adopted at the position close to the well protecting wall, and the manual excavation and unearthing mode is carried out by adopting a chain block; binding reinforcing steel bars in time after each layer of excavation is finished; after the acceptance is qualified, template construction is carried out in time, and concrete is poured in time; after the foundation pit is excavated to the designed bottom elevation, the final protective wall of the well and the bottom plate are constructed simultaneously, the integrity of the protective wall and the bottom plate is ensured, construction joints are reduced, and the risk of water leakage is reduced.
6. The reverse construction method of the vertical shaft for ensuring the normal use of the existing pipeline according to claim 5, which is characterized in that: when carrying out well dado reinforcement construction occasionally the following main points: (1) the specifications of the steel bars comprise C12, C16, C18, C20 and C22, the steel bars are retested for the physical properties of tensile strength, yield point, elongation and cold bending test according to the specification requirements before entering a field, and the steel bars are used after the performance of the steel bars is determined to meet the specification requirements;
(2) uniformly processing the semi-finished products of the reinforcing steel bars in a reinforcing steel bar processing field, and conveying the semi-finished products of the reinforcing steel bars to a construction site for binding and welding the reinforcing steel bars; (3) all the steel bar joints are welded, the length of single-side lap welding is 10 times of the diameter of the steel bar, and the length of adjacent steel bar lap staggering is 35 times of the diameter of the steel bar;
(4) a pre-buried hole needs to be reserved in the well protecting wall, the pre-buried diameter is 1.2 times of the diameter of the pipeline and is 200mm, the hole is reserved strictly according to design drawings in the binding process of reinforcing steel bars, the reinforcing steel bars at the reserved part of the hole are re-welded by using annular reinforcing steel bars after being cut off, and reinforcing steel bars are arranged around the reserved hole;
(5) the thickness of the well protection wall protective layer is 40mm, and the cushion blocks used by the protective layer are cement mortar cushion blocks with the same label;
(6) the metal wires for binding the steel bars are soft iron wires of No. 20-22, the intersections of all the steel bars are firmly tied by the soft iron wires, and the ends of the soft iron wires are bent into the concrete;
(7) manufacturing the well protecting wall reinforcing steel bars of each layer, wherein the vertical reinforcing steel bars are crossly arranged at least 30cm and 130cm deep into the lower layer, and reserved for connecting the lower layer reinforcing steel bars, the lower layer reinforcing steel bars and the upper layer reserved reinforcing steel bars are connected in a welding mode, and the single-side welding length is ten times of the diameter of the reinforcing steel bars, so that the integrity of the well protecting wall reinforcing steel bars is ensured;
(8) and after the foundation pit is excavated to the designed foundation pit bottom elevation, the last retaining wall reinforcing steel bar and the bottom plate reinforcing steel bar are constructed simultaneously, and the connection is firm.
7. The reverse construction method of the vertical shaft for ensuring the normal use of the existing pipeline according to claim 6, which is characterized in that: when the well protection wall template is constructed, the inner template of the well protection wall is completely a shaped steel template, and the surface of the template is smooth and meets the standard requirement; the purlin surrounding keel is made of phi 48 steel pipes, phi 48 steel pipe fasteners are adopted for fastening, the horizontal distance is 45cm, and the vertical distance is 45 cm; the connection between the templates is tight and firm by using snap fasteners, simultaneously, all the abutted seams and the seams of the templates are embedded one by adopting thickened double faced adhesive tapes to prevent slurry leakage, and after the templates are erected, an owner and a supervision engineer are required to perform acceptance inspection, wherein the main acceptance inspection is the items such as plane size, section size, flatness, wall through hole and the like; the square wood is vertically placed without intervals; the bracket is supported by a steel pipe fastener; measuring and lofting according to the size shown in the drawing; the formwork is installed correctly and stably, the step distance of the support erection is 60cm, the horizontal transverse distance and the longitudinal distance are 60cm, and steel pipe inclined struts are additionally arranged according to the actual situation on site to ensure that the formwork can bear the lateral pressure generated during concrete pouring and vibrating and is not influenced by weather; the template at the enlarged footing is arranged at an angle of 120 degrees with the vertical template, the enlarged footing template is higher than the bottom of the upper protective wall, the aperture of the pouring hole is 200mm, and the steel pipe is adopted for firm support; when the formwork is erected, the formworks are uniformly and straightly arranged, so that the concrete surface at the joint is flat and uniform; the seam design of the template is coordinated with the appearance of the structure, so that the vertical and plane seams are kept straight; the template can not be directly connected with the structural steel bar so as to avoid deformation and dislocation of the template; one end of the pull rod extending deeply is welded and fixed with the steel bar; the end part of the bracket is tightly propped against the square timber of the fixed template by adopting a jacking bracket, and the gap is tightly wedged by adopting a wooden wedge; fixing the embedded part or the reserved pipe on the template according to the drawing requirements and the actual surveying position and elevation; before die assembly, cleaning up impurities, accumulated water and dirt on the steel bars in the template; the inner surface of the template is coated with a release agent to prevent the adhesion with concrete and facilitate the removal of the template; before the concrete is poured, removing sawdust, wood shavings, dust, other impurities and stagnant water on the molding surface of the template; before concrete is poured, the positions of the embedded parts and the reserved holes are determined to be firmly installed; when the support and the template are dismantled, the first-assembling and then-disassembling principle is adopted, the support and the template can be dismantled after the structure reaches more than 80% of the design strength, and the next section of well retaining wall earth excavation construction is carried out after the support and the template are dismantled.
8. The reverse construction method of the vertical shaft for ensuring the normal use of the existing pipeline according to claim 7, which is characterized in that: during concrete pouring construction, concrete is intensively mixed by adopting a mixing station, a concrete transport vehicle transports the concrete, a crane bucket enters a mold, and construction requirements and cautions are as follows:
before pouring, checking the support, the template, the steel bar and the embedded part, wherein if the template has a gap, the template needs to be tightly filled, and the inner surface of the template needs to be coated with a release agent;
before pouring, checking the uniformity and slump of concrete;
for a scaffold used for pouring concrete, personnel and a material tool can conveniently move up and down, and the safety must be ensured;
the concrete is poured in layers according to the thickness, the sequence and the direction, the upper layer concrete is poured before the lower layer concrete is initially set or can be remolded, and the concrete layered pouring thickness is not more than 30 cm;
when concrete is poured, an inserted vibrating rod is adopted for tamping, and the vibrating is in accordance with the following standards:
when the plug-in vibrating rod is used, the moving distance is not more than 1.5 times of the acting radius of the vibrating rod; keeping a distance of 5-10 cm with the side mold; inserting 5-10 cm of lower layer concrete; vibrating and extracting the vibrating rod slowly after each vibrating part is finished; the vibrating rod is prevented from colliding with the template, the steel bar and other embedded parts;
for each vibration part, the vibration is carried out until the concrete at the part is compact; the compact mark is that the concrete stops sinking, no air bubbles emerge, the surface is flat and the concrete is overflowed;
the concrete pouring is carried out continuously, for example, the concrete pouring is interrupted due to reasons, and the interruption time is less than the initial setting time or the remolding time of the front layer concrete; the allowable interruption time is determined by tests, and if the allowable interruption time is exceeded, quality assurance measures or treatment according to a working seam are required;
during the concrete pouring process, attention should be paid to the observation:
observing whether the arranged embedded bolt and the preformed hole move at any time, and correcting in time if the displacement is found;
the forming equipment of the preformed hole is pulled and loosened in time;
paying attention to the supporting conditions of the template, the bracket and the like in the pouring process, arranging special people for checking, if deformation exists, displacement or subsidence needs to be immediately corrected and reinforced, and pouring can be continued after treatment;
during or after the pouring process, if the surface of the concrete is drained, measures are taken to remove water under the condition of not disturbing the poured concrete if the surface of the concrete is drained too much; when concrete is continuously poured, reasons need to be found out, measures are taken, and bleeding is reduced;
after concrete pouring is finished, finishing and trowelling the exposed surface of the concrete in time, and performing secondary press polishing or napping after sizing;
and after the concrete reaches a certain strength, covering, preserving heat and maintaining in time.
9. The reverse construction method of the vertical shaft for ensuring the normal use of the existing pipeline according to claim 8, which is characterized in that: comprises a locking ring connected with a retaining wall, an upper well retaining wall connected with a lower well retaining wall, and a bottom plate connected with the well retaining wall; when the fore shaft ring is connected with the retaining wall, a throat ring beam and the upper part of the retaining wall are constructed simultaneously; when the upper section well retaining wall is connected with the lower well retaining wall, (1) the reserved steel bars of the upper part vertical well retaining wall are cleaned before the steel bars are bound, and impurities such as undisturbed soil and the like are not mixed on the surface; (2) chiseling the connecting part of the vertical shaft protecting wall to enable stones to leak outside the vertical shaft protecting wall; (3) a funnel-shaped pouring gate with the height of 30cm is arranged at the upper part of the template, the lower part of concrete is poured firstly, when the concrete is poured to the sealing height, the gap of the concrete is tightly filled by means of pouring pressure and a vibrator, and after the concrete of the funnel part is hardened, the surface is chiseled and leveled; when the bottom plate is connected with the well protection wall, the bottom plate is bound and connected with the reserved ribs of the well protection wall; controlling the concrete slump at 12 +/-2 cm; the primary concrete pouring height is 30cm, and the concrete around the primary concrete pouring height uniformly rises; covering the concrete within 12 hours after the concrete pouring is finished, and carrying out wet curing for more than 14 days.
10. The reverse construction method of the vertical shaft for ensuring the normal use of the existing pipeline according to claim 9, which is characterized in that: when the protecting wall and the bottom plate of the last section of well are constructed, after the foundation pit is excavated to the designed bottom elevation, the last section of well wall and the bottom plate are constructed simultaneously, a cushion layer is poured, and reinforcing steel bars of the bottom plate are bound to be connected with reinforcing steel bars of the last section of well wall, so that the segmented structures are connected into a whole; the formwork frame is erected on the bottom plate to be elevated, a bottom plate concrete pouring space is reserved, after the concrete is initially set, the formwork frame body is detached, holes formed by the formwork frame body are chiseled and shaved, and the poured concrete is repaired to be smooth.
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