CN113898007A - Semi-inverse construction method for long-span corridor structure along street - Google Patents
Semi-inverse construction method for long-span corridor structure along street Download PDFInfo
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Abstract
The invention discloses a method for constructing a long-span corridor structure along a street in a semi-reverse mode, wherein during construction, a foundation pit support and a basement structure are sequentially constructed, a ground structure is constructed by adopting a semi-reverse construction method, and the construction efficiency can be effectively improved by combining the semi-reverse construction method and the basement structure for cross construction, the cost is saved, the ground structure is quickly constructed, more operation time is provided for other professional insertion construction, and the engineering delay risk is reduced; the method comprises the steps of firstly completing the construction of a diaphragm wall maintenance structure and a support column on the ground, then excavating earthwork in sequence, constructing an inner support and a bottom plate, then adopting a creeping formwork to construct a corridor structure column to a corridor structure layer on the ground, installing a corridor steel structure, and constructing other structure floors upwards in sequence; therefore, the ground and underground structure is convenient to operate, mutual assistance is realized, the influence of a construction operation surface is avoided, the construction period can be greatly shortened, and the construction quality is ensured; the traffic influence on a commercial core area is reduced, the occupied road of a project is reduced, and more construction operation surfaces are provided.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a semi-inverse construction method of a street-following large-span corridor structure.
Background
Along with the development of the construction industry, more and more twin tower buildings, new buildings and old buildings connected buildings are continuously developed, and the twin tower buildings are often developed in stages due to the large building size, long development period, uncertain market and the like and the planning problem of city start. Therefore, in order to connect the twin towers together to form an overall development value, it is necessary to erect a corridor (including an overground corridor and an underground passage) between the twin towers. However, due to the fact that the super high-rise is mostly located in a commercial core area, traffic is busy, particularly, a large-span street-crossing corridor relates to long-term road occupation construction and affects traveling, efficient construction of the street-crossing corridor becomes a key factor of super high-rise construction, and how to quickly construct the connecting corridor becomes a difficult problem. The corridor practice adopts a forward method, a reverse method and the like, however, both methods have advantages and disadvantages due to the problems of cost and construction period. The reverse construction method accelerates the construction period of the overground project, but slows down the construction period of the basement, and delays the final acceptance time of the project. The construction method can lead to the construction completion time lag of the ground structure, and the insertion time of other specialties is late, so that the whole acceptance of later-stage engineering is restricted and influenced, and great risk is caused.
Therefore, how to construct the super-high-rise large-span deep foundation pit cross-street vestibule by adopting a targeted semi-inverse method from the optimization design of the construction process as an eyepoint further ensures the construction progress on the ground and ensures other major on the ground to insert into construction as soon as possible, and the method has consideration to both the cost and the construction period, shortens the engineering construction period to a greater extent, reduces the construction cost, realizes the cost reduction and the efficiency improvement of the engineering, and is a key point and a difficult point of research.
Disclosure of Invention
The invention provides a semi-inverse construction method for a street-following large-span corridor structure, which is used for solving the technical problems of convenient and fast joint construction of a street-following large-span corridor and a basement, targeted construction design of corridor structure columns, synchronous construction in a limited space and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for constructing a long-span corridor structure along a street in a semi-inverse mode comprises the following specific steps:
firstly, constructing a ground connection wall which is used as a supporting structure and a permanent basement outer wall; the construction mainly comprises guide wall construction, slurry preparation and treatment, continuous wall grooving, reinforcement cage manufacturing and hoisting and concrete pouring; when the joint is processed, the joint reinforcing steel bars are arranged in the subsequent groove section and extend into the splicing steel plate area of the joint, and the waterproof mode adopts internal waterproof;
and step two, constructing the upright post pile and the engineering pile, wherein the upright post pile and the engineering pile are rotary excavating cast-in-place piles, and the upright post pile is constructed on the ground by adopting a pile jumping method. The end of the compression-resistant pile enters a slightly weathered rock bearing stratum by 0.5m, and the end of the uplift pile enters a medium weathered rock bearing stratum by not less than 0.5 m; in addition, when more pipelines exist on site, in order to ensure the safety and smooth pore-forming of the pipelines, an ultra-long protective cylinder can be adopted for auxiliary construction;
thirdly, earth excavation construction is carried out, a city center street and/or a road are/is arranged above the excavated area of the earth body, inner supports are fully distributed in the foundation pit, and the support clear distance is small; adopting staged earth excavation and carrying out combined construction through a digging machine and a grab bucket machine; arranging drainage ditches at the periphery of the foundation pit, and enabling surface water to flow into the sedimentation tank from the drainage ditches and finally flow into municipal catch basins at the periphery of the ground;
step four, inner support construction, namely arranging a part of sealing plates on the first layer, and adding an early strength agent into concrete in the inner support construction process; the inner supports are connected with the ground connecting wall through waist beams and are alternately constructed with earthwork construction, and the construction of the inner supports is started when earthwork is excavated to the bottom elevation of each inner support;
fifthly, carrying out the foundation slab according to the main procedures of substrate cleaning, cushion layer pouring, pile foundation detection, pile head treatment, waterproof construction, slab structure construction and the like, wherein the slab concrete pouring adopts an overhead pump, and large-volume concrete pouring needs to be paid attention to timely cooling and maintenance;
step six, after the construction of the foundation bottom plate is completed, the construction of the corridor structure column, the construction of the ground steel structure and other structural layer constructions are carried out;
the corridor structure column construction is carried out, namely corridor structure column construction is inserted after foundation bottom plate construction is finished, and corridor structure columns are constructed before underground structures; meanwhile, the corridor structure column is constructed by adopting an upright post independent creeping formwork system;
seventhly, when the corridor structure column is constructed in advance, pouring construction is carried out by adopting a tower crane and a hopper; cutting off the longitudinal bars of the concrete structure beams and the column cap reinforcing bars at the sides of the columns at each underground layer to form beam and slab throwing bars of the basement and pre-embed a reinforcing bar connector;
step eight, the corridor structure adopts a steel truss structure and a profiled steel plate structure, the cross steel rib or H-shaped steel rib and steel structures on two sides of the corridor are firstly installed on the above-ground corridor structure, then a middle truss structure is installed by adopting a jig-free installation method, a bottom truss is installed firstly, then an upper truss structure is installed in sequence, the profiled steel plate is installed after the truss structure is installed, a floor slab and a steel bar of the large column are bound, and the large column and the floor slab concrete are poured until the structure is capped;
ninth, the underground structure construction mainly comprises basement structure construction, earthwork backfill and roadbed and pavement construction which are alternated during the construction period of the corridor structure column; constructing the plate surface of the underground part structure, reserving holes and reinforcing steel bars at the crossed part of the underground part structure and the upright post pile, constructing the basement beam slab from bottom to top, sequentially and alternately detaching the inner support and replacing the support system after finishing the next layer of the basement beam slab; and after all underground structures are constructed, dismantling the upright post piles and filling the reserved holes of the basement.
Further, when the joint is processed in the first step, the ground connecting wall adopts an I-shaped steel joint, a splicing steel plate of the I-shaped steel joint is welded with a steel bar of the prior groove section, and a joint steel bar arranged in the subsequent groove section extends into a splicing steel plate area of the joint; in order to avoid pouring concrete, the concrete bypasses the gap and fills the vacant sites of the groove sections in the second period, square foam and sand bags are adopted at the joints, and meanwhile, a grout stopping plate is additionally arranged on the back soil side in the wall.
Further, in the second step, when the engineering pile is drilled into rock, a special cone is adopted for crushing, and the engineering pile correspondingly enters slightly weathered granite; and (5) carrying out construction on the piles with the ultra-large diameters by adopting graded rock embedding.
Further, in the second step, after the concrete is poured into the pile casing of the cast-in-situ bored pile, the pile casing is pulled out after the last guide pipe is pulled out; the empty pile treatment directly influences the subsequent cast-in-place pile construction, in order to avoid influencing the hole forming of the adjacent cast-in-place pile, 20% cement soil is adopted for backfilling, and the soil can be in-situ undisturbed soil; when the engineering pile is constructed on the ground, earth excavation is carried out subsequently, and 1m of the top of the pile is backfilled by adopting broken stones.
Furthermore, in the third step, the earth excavation is carried out according to the principle that the earth excavation is carried out from top to bottom, is symmetrical and uniform and is carried out after the support; when the foundation pit is deep, the earthwork excavation is performed stage by stage, the upper layer is shallow, the earthwork of the first layer on the upper portion is directly excavated by the excavator, and under the condition that the construction working face is limited, the excavator is matched with the excavator at the position of the foundation pit sealing plate by the grab bucket machine to perform the earthwork excavation construction.
Further, after the strength of the inner support concrete reaches 80% in the fourth step, excavation of the earthwork on the lower side of the support is carried out, after the construction of the upright post pile constructed as the vertical support is completed, the upper steel pipe concrete structure column is connected with the horizontal inner support, and the temporary steel pipe upright post is supported in the angle iron support through the steel supporting plate.
Furthermore, in the sixth step, the template of the corridor structure column adopts an aluminum film, a jig frame is arranged at the supporting height of each foundation pit, and the jig frame is welded with the bracket of the corridor structure column and is connected with the inner support and/or the upright column pile by using embedded parts.
Further, the corridor structure column firstly adopts the design of an operation platform required by steel bar binding, template supporting and concrete pouring, and the protection design between the corridor structure column construction and the corridor structure beam plate construction working face; the operation platform and the protection adopt hydraulic protection screen devices, each column is provided with one set of independent hydraulic protection screen system, and work such as reinforcement and formwork erection is facilitated.
Further, the corridor structure column is a steel column, and the steel column comprises a square pipe column and a cross steel rib and/or an H-shaped steel rib which are connected inside the square pipe column; gallery column concrete and a gallery column inner rib are connected inside the steel column; the square pipe column is horizontally pre-embedded and connected with an independent column climbing formwork system at intervals, and the independent column climbing formwork system comprises a climbing formwork connecting piece and a climbing formwork platform which are connected with the square pipe column; the creeping formwork platform corresponds the setting around vestibule structure post.
And further, in the seventh step, the outer ends of all the steel bar connectors are arranged 15mm behind the column edge, and column concrete chiseling is carried out on the positions of the butt joints when corridor structure beam plates are constructed in the later stage.
The invention has the beneficial effects that:
1) the foundation pit support and the basement structure are sequentially constructed, the ground structure is constructed by adopting a semi-reverse construction method, the foundation pit support and the basement structure are combined with cross construction, the construction efficiency can be effectively improved, the cost is saved, the ground structure is quickly constructed, more operation time is provided for other professional insertion construction, and the project delay risk is reduced;
2) the method comprises the steps of firstly completing the construction of a diaphragm wall maintenance structure and a support column on the ground, then excavating earthwork in sequence, constructing an inner support and a bottom plate, then adopting a creeping formwork to construct a corridor structure column to a corridor structure layer on the ground, installing a corridor steel structure, constructing other structure floors upwards in sequence, and synchronously inserting the corridor structure column into a basement structure and dismantling the inner support during construction; therefore, the ground and underground structure is convenient to operate, mutual assistance is realized, the influence of a construction operation surface is avoided, the construction period can be greatly shortened, and the construction quality is ensured;
3) the construction method has short construction period, reduces the traffic influence on a commercial core area, and reduces the occupied road of a project; provide more construction operation faces, guarantee personnel and major structure and form the flowing water, avoid personnel to work too hard.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention; the primary objects and other advantages of the invention may be realized and attained by the instrumentalities particularly pointed out in the specification.
Drawings
Fig. 1 is a main flow diagram of a semi-inverse construction method of a large-span corridor structure along a street.
FIG. 2 is a schematic diagram of the construction of diaphragm wall, engineering pile and stud pile;
FIG. 3 is a schematic illustration of earth excavation, shoring and shoring construction;
FIG. 4 is a schematic diagram of floor casting and corridor structure column pre-construction;
FIG. 5 is a schematic view of the construction of a beam, a slab and a column of a basement, the synchronous dismantling of supports, and the construction of a column top to a designed elevation;
FIG. 6 is a schematic view of the construction of installation of a corridor steel structure beam-column plate on the ground, construction of a basement beam-column plate and a basement underground, and synchronous dismantling of a support;
FIG. 7 is a schematic view of the construction of the top plate of the basement and the synchronous installation and construction of the corridor steel structure;
FIG. 8 is a layout view of a vestibule structure column hydraulic protection screen;
FIG. 9 is a layout view of a vestibule structure column hydraulic protection shield;
figure 10 is a schematic view of the connection of the vestibule structure column to the skirt steel column.
Reference numerals: 1-diaphragm wall, 2-engineering pile, 3-soil body, 4-basement beam slab elevation, 5-drilling and pouring pile machine, 6-inner support, 7-earthwork digging and transporting equipment, 8-upright pile, 9-basement beam slab, 10-corridor structural column, 101-corridor column concrete, 102-corridor column inner rib, 11-basement beam slab slinging rib, 12-upright column independent creeping formwork system, 121-creeping formwork connecting piece, 122-creeping formwork platform, 13-corridor structural beam slab, 14-corridor truss column, 15-corridor top plate, 16-skirt house steel column and 17-overturn preventing device.
Detailed Description
A certain financial center project is positioned at a road intersection, is of a frame core tube structure, and is positioned into an urban complex integrating offices, businesses and high-end hotels. The project is in a busy central area and is a main traffic road in an urban area, the traffic flow is large, and underground pipelines are dense. The south tower project and the north tower project are connected into a whole through an underground layer B2-B5 and an overground layer L3-L7, wherein the basement is of a reinforced concrete frame structure, the overground corridor is of a steel structure, and the corridor is supported by eight giant columns. The temporary ground connecting wall 1 is divided into two independent foundation pits, the deepest foundation pit of the south tower reaches 37.4m, and the area of the foundation pit of the south tower is 6940 square meter; the area of the other foundation pit is 4240 square meters, and the safety levels of the two foundation pits are respectively one level.
With reference to fig. 1 to 10, a method for constructing a street-following large-span corridor structure in a semi-inverse manner is further described, wherein B1, B2, B3 and B4 in the drawings respectively represent the elevation 4 of a beam slab of a basement, and the basement base slab corresponds to the bottom of the basement; l1 and L2 represent the elevations of each layer of the corridor, wherein the specific steps are as follows:
firstly, constructing a ground connecting wall 1, wherein the ground connecting wall 1 is used as a supporting structure and a permanent basement outer wall; the construction mainly comprises guide wall construction, slurry preparation and treatment, continuous wall grooving, reinforcement cage manufacturing and hoisting and concrete pouring; when the joint is processed, the joint reinforcing steel bars are arranged in the subsequent groove section and extend into the splicing steel plate area of the joint, and the waterproof mode adopts internal waterproof;
in the embodiment, when the joint is processed in the first step, the underground diaphragm wall 1 adopts an I-shaped steel joint, a splicing steel plate of the I-shaped steel joint is welded with a steel bar of a previous groove section, and a joint steel bar arranged in a subsequent groove section extends into a splicing steel plate area of the joint; in order to avoid pouring concrete, the concrete bypasses the gap and fills the vacant sites of the groove sections in the second period, square foam and sand bags are adopted at the joints, and meanwhile, a grout stopping plate is additionally arranged on the back soil side in the wall.
And step two, constructing the upright post pile 8 and the engineering pile 2 through the drilling cast-in-place pile machine 5, wherein the upright post pile 8 and the engineering pile 2 are rotary excavating cast-in-place piles, and the upright post pile 8 is constructed on the ground by adopting a pile jumping method. The end of the compression-resistant pile enters a slightly weathered rock bearing stratum by 0.5m, and the end of the uplift pile enters a medium weathered rock bearing stratum by not less than 0.5 m. In addition, when more pipelines exist on site, in order to ensure the safety and smooth pore-forming of the pipelines, an ultra-long protective cylinder can be adopted for auxiliary construction; when the engineering pile 2 enters the rock, a special gear drill is adopted to crush the engineering pile, and the engineering pile correspondingly enters slightly weathered granite; and (5) carrying out construction on the piles with the ultra-large diameters by adopting graded rock embedding.
In the embodiment, after the concrete is poured into the pile casing of the cast-in-situ bored pile, the pile casing is pulled out after the last guide pipe is pulled out; the empty pile treatment directly influences the subsequent cast-in-place pile construction, in order to avoid influencing the hole forming of the adjacent cast-in-place pile, 20% cement soil is adopted for backfilling, and the soil can be in-situ undisturbed soil; when the engineering pile 2 is constructed on the ground, earth excavation is carried out subsequently, and 1m of the top of the pile is backfilled by adopting broken stones.
Thirdly, earth excavation construction is carried out, a city center street and/or a road are/is arranged above the excavation area of the soil body 3, inner supports 6 are fully distributed in the foundation pit, and the support clear distance is small; adopting staged earth excavation and carrying out combined construction through a digging machine and a grab bucket machine; arranging drainage ditches at the periphery of the foundation pit, and enabling surface water to flow into the sedimentation tank from the drainage ditches and finally flow into municipal catch basins at the periphery of the ground;
in the third step, the earth excavation is carried out according to the principle that the earth excavation is carried out from top to bottom, symmetrical and uniform and is firstly supported and then excavated according to the comprehensive consideration of the actual plane shape of the foundation pit, the design working condition requirement, the soil layer excavation depth, the surrounding environment, the earth excavation and transportation equipment 7 and the like. Because the foundation ditch is darker, adopt soil excavation stage by stage, the upper strata is lighter, so the first layer earthwork in upper portion adopts the excavator direct excavation, follow-up because of construction operation face is limited, can't set up the ramp in foundation ditch inside, so adopt the cooperation excavator of clamshell machine ZLD100 clamshell machine to carry out the soil excavation construction in foundation ditch shrouding department.
Before the foundation pit is excavated, arrangement of a water supply system, a power supply system, a drainage system, a construction road, an excavation temporary ramp in the foundation pit, an earth outlet, construction facilities, a material yard and the like in a construction area is required according to a construction plane layout. And rechecking the measurement datum line and the leveling point, wherein the datum line and the leveling point are arranged in an area which is not influenced by the excavation of the foundation pit, and paying attention to the protection work in the construction process.
Deep basal pit excavation, during the foundation ditch construction, need set up the escape canal at the foundation ditch periphery, surface water flows into the sedimentation tank from the escape canal, flows into in the peripheral municipal rainwater well in place at last. Meanwhile, in the excavation process of the foundation pit earthwork, the water collecting wells and the water pumps with enough quantity need to be arranged, and the accumulated water can be discharged from the inside of the foundation pit to the outside. When the earth is excavated, the deformation of the foundation pit should be closely monitored, the excavation is immediately stopped when the abnormal deformation condition occurs, the technical units such as monitoring and design and the like share measures, and meanwhile, the sinking and the deformation of adjacent buildings or structures, roads, pipelines and the like should be prevented. And arranging a specially-assigned person to command mechanical operation during excavation.
Step four, the super high-rise building is limited to be in a commercial core area, the construction site of the connecting part of the corridor is narrow, in order to effectively utilize the construction operation space, the inner support 6 is constructed, a part of sealing plates are arranged on the first floor, and an early strength agent is added into the concrete in the construction process of the inner support 6; the inner supports 6 are connected with the underground diaphragm wall 1 through waist beams and are constructed alternately with earthwork construction, and when earthwork is excavated to the bottom elevation of each inner support 6, construction of the inner supports 6 is started;
and step four, connecting the inner supports 6 with the underground diaphragm wall 1 through the waist beam, alternately constructing with earthwork construction, and starting the construction of the inner supports 6 when the earthwork is excavated to the bottom elevation of each inner support 6. The excavation of supporting lower-side earthwork can be carried out after the strength of the inner support 6 concrete reaches 80%. After the construction of the structural pile constructed as the vertical support is completed, the upper steel pipe concrete structural column is connected with a horizontal support system in future, and the temporary steel pipe upright column is supported in the horizontal support 6 through a steel supporting plate and an angle iron support.
Fifthly, carrying out the foundation slab according to the main procedures of substrate cleaning, cushion layer pouring, pile foundation detection, pile head treatment, waterproof construction, slab structure construction and the like, wherein the slab concrete pouring adopts an overhead pump, and large-volume concrete pouring needs to be paid attention to timely cooling and maintenance;
step six, after the construction of the foundation slab is completed, constructing the corridor structure column 10, the ground steel structure and other structural layer; the corridor structure column 10 is constructed, namely the corridor structure column 10 is inserted for construction after the foundation slab construction is finished, and the corridor structure column 10 is constructed in advance of an underground structure; meanwhile, the corridor structure column 10 is constructed by adopting an upright independent creeping formwork system 12;
and in the sixth step, the template of the corridor structure column 10 adopts an aluminum film, the overall height is high, in order to maintain the overall stability of the steel skeleton of the structure column, a jig frame is arranged at the supporting height of each foundation pit, and the jig frame is welded with the bracket of the corridor structure column 10 and connected with the inner support 6 and/or the upright column pile 8 by using embedded parts.
In the embodiment, the corridor structure column 10 is firstly subjected to the design of an operation platform required by steel bar binding, template supporting and concrete pouring, and the protection design between the corridor structure column 10 construction and the corridor structure beam plate 13 construction working face; the operation platform and the protection adopt hydraulic protection screen devices, each column is provided with one set of independent hydraulic protection screen system, and work such as reinforcement and formwork erection is facilitated.
In this embodiment, the corridor structural column 10 is a steel column, and the steel column includes a square pipe column, and a cross steel rib and/or an H-shaped steel rib connected inside the square pipe column; gallery column concrete 101 and a gallery column inner rib 102 are poured inside the steel column; must set up the anti-overturning measure before the mid portion truss installation between L3 layer and above each layer skirt house steel column 16 and vestibule structure post 10, and anti-overturning device 17 adopts the vertical setting of the high steel sheet of the thick 900mm of 25mm, connects skirt house post and vestibule structure post 10 through high steel sheet, transmits horizontal pulling force.
In this embodiment, the square tubular column is horizontally connected with the stand column independent creeping formwork system 12 at intervals, and the stand column independent creeping formwork system 12 includes a creeping formwork connecting piece 121 and a creeping formwork platform 122 connected with the square tubular column; the creeping formwork platform 122 is correspondingly arranged around the corridor structure column 10.
Seventhly, when the corridor structural column 10 is constructed in advance, pouring construction is carried out by adopting a tower crane and a hopper; cutting off longitudinal bars of concrete structure beams and column cap steel bars at each underground layer at the sides of the columns to form beam slab slings 11 of the basement and pre-embed steel bar connectors;
and in the seventh step, the outer ends of all the steel bar connectors are arranged 15mm behind the column edge, and column concrete chiseling is carried out on the positions of the stubbles when the corridor structure beam plate 13 is constructed in the later stage. In addition, because the vestibule structure post 10 is higher, in order to guarantee the quality of construction, should strengthen measuring the unwrapping wire, guarantee the straightness that hangs down of vestibule structure post 10, and the maintenance of paying attention to aluminium membrane and hydraulic pressure protection screen.
Step eight, the corridor structure adopts a steel truss structure and a profiled steel plate structure, the cross steel rib or H-shaped steel rib and steel structures on two sides of the corridor are firstly installed on the above-ground corridor structure, then a middle truss structure is installed by adopting a jig-free installation method, a bottom truss is installed firstly, then an upper truss structure and corridor truss columns 14 are sequentially installed, the profiled steel plate is installed after the truss structure is installed, floor slabs and giant column steel bars are bound, and giant columns and floor slab concrete are poured until the roof 15 of the connecting beam is capped;
ninth, the underground structure construction mainly comprises basement structure construction, earthwork backfilling and roadbed and pavement construction which are inserted during the construction of the corridor structure column 10; the construction of the plate surface of the underground part structure is to reserve holes and reinforcing steel bars at the crossed part of the underground part structure and the upright post pile 8, construct the basement beam slab 9 from bottom to top, sequentially and alternately remove the inner support 6 and replace the support system after the next layer of basement beam slab 9 is completed; and after all underground structures are constructed, dismantling the upright post piles 8 and filling the reserved holes of the basement.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.
Claims (10)
1. A method for constructing a large-span corridor structure along a street in a semi-inverse mode is characterized by comprising the following specific steps of:
firstly, constructing a ground connection wall (1), wherein the ground connection wall (1) is used as a supporting structure and a permanent basement outer wall; the construction mainly comprises guide wall construction, slurry preparation and treatment, continuous wall grooving, reinforcement cage manufacturing and hoisting and concrete pouring; when the joint is processed, the joint reinforcing steel bars are arranged in the subsequent groove section and extend into the splicing steel plate area of the joint, and the waterproof mode adopts internal waterproof;
constructing the upright post pile (8) and the engineering pile (2), wherein the upright post pile (8) and the engineering pile (2) are rotary excavating cast-in-place piles, and the upright post pile (8) is constructed on the ground by adopting a pile jumping method; the end of the compression-resistant pile enters a slightly weathered rock bearing stratum by 0.5m, and the end of the uplift pile enters a medium weathered rock bearing stratum by not less than 0.5 m; in addition, when more pipelines exist on site, in order to ensure the safety and smooth pore-forming of the pipelines, an ultra-long protective cylinder can be adopted for auxiliary construction;
thirdly, earth excavation construction is carried out, a city center street and/or a road are/is arranged above an excavation area of a soil body (3), inner supports (6) are fully distributed in a foundation pit, and the support clear distance is small; adopting staged earth excavation and carrying out combined construction through a digging machine and a grab bucket machine; arranging drainage ditches at the periphery of the foundation pit, and enabling surface water to flow into the sedimentation tank from the drainage ditches and finally flow into municipal catch basins at the periphery of the ground;
step four, constructing the inner support (6), arranging a part of sealing plates on the first layer, and adding an early strength agent into concrete in the construction process of the inner support (6); the inner supports (6) are connected with the underground diaphragm wall (1) through waist beams and are alternately constructed with earthwork construction, and the construction of the inner supports (6) is started when earthwork is excavated to the bottom elevation of each inner support (6);
fifthly, carrying out the foundation slab according to the main procedures of substrate cleaning, cushion layer pouring, pile foundation detection, pile head treatment, waterproof construction, slab structure construction and the like, wherein the slab concrete pouring adopts an overhead pump, and large-volume concrete pouring needs to be paid attention to timely cooling and maintenance;
step six, after the construction of the foundation bottom plate is completed, constructing the corridor structure column (10), the ground steel structure and other structural layer;
the corridor structure column (10) construction is carried out, namely the corridor structure column (10) construction is inserted after the foundation bottom plate construction is finished, and the corridor structure column (10) is constructed before the underground structure construction; meanwhile, the corridor structure column (10) is constructed by adopting an upright column independent creeping formwork system (12);
seventhly, when the corridor structure column (10) is constructed in advance, pouring construction is carried out by adopting a tower crane and a hopper; cutting off the longitudinal bars of the concrete structure beams and the column cap steel bars at each underground layer at the sides of the columns to form the beam slab throwing bars (11) of the basement and pre-embed the steel bar connectors;
step eight, the corridor structure adopts a steel truss structure and a profiled steel plate structure, the cross steel rib or H-shaped steel rib and steel structures on two sides of the corridor are firstly installed on the above-ground corridor structure, then a middle truss structure is installed by adopting a jig-free installation method, a bottom truss is installed firstly, then an upper truss structure is installed in sequence, the profiled steel plate is installed after the truss structure is installed, a floor slab and a steel bar of the large column are bound, and the large column and the floor slab concrete are poured until the structure is capped;
ninth, the underground structure construction mainly comprises basement structure construction, earthwork backfill and roadbed and pavement construction which are inserted during the construction of the corridor structure column (10); the construction of the plate surface of the underground part structure is to reserve holes and reinforcing steel bars at the crossed part of the underground part structure and the upright post piles (8), the basement beam plates (9) are constructed from bottom to top, and after the next layer of basement beam plates (9) is completed, the inner supports (6) are sequentially and alternately dismantled, and the support system is replaced; and after all underground structures are constructed, dismantling the upright post piles (8) and filling the reserved holes of the basement.
2. The method for constructing the large-span corridor structure along the street in the semi-reverse mode according to the claim 1, wherein for the step one, when the joint is processed, the underground diaphragm wall (1) adopts an I-shaped steel joint, a splicing steel plate of the I-shaped steel joint is welded with a steel bar of a previous groove section, and a joint steel bar arranged at a subsequent groove section extends into a splicing steel plate area of the joint; in order to avoid pouring concrete, the concrete bypasses the gap and fills the vacant sites of the groove sections in the second period, square foam and sand bags are adopted at the joints, and meanwhile, a grout stopping plate is additionally arranged on the back soil side in the wall.
3. The method for constructing the large-span corridor structure along the street in the semi-reverse mode according to the claim 1, wherein in the second step, the engineering pile (2) is broken by a special roller drilling machine when entering the rock, and correspondingly enters slightly weathered granite; and (5) carrying out construction on the piles with the ultra-large diameters by adopting graded rock embedding.
4. The semi-top construction method of the street-following large-span corridor structure according to claim 3, wherein in the second step, after the concrete is poured into the pile casing of the cast-in-situ bored pile, the pile casing is pulled out after the last guide pipe is pulled out; the empty pile treatment directly influences the subsequent cast-in-place pile construction, in order to avoid influencing the hole forming of the adjacent cast-in-place pile, 20% cement soil is adopted for backfilling, and the soil can be in-situ undisturbed soil; when the engineering pile (2) is constructed on the ground, earth excavation is carried out subsequently, and 1m of the top of the pile is backfilled by adopting broken stones.
5. The method for constructing the large-span corridor structure along the street in the semi-reverse operation manner as claimed in claim 1, wherein in the third step, earth excavation is performed according to the comprehensive consideration of the actual plane shape of the foundation pit, the design working condition requirement, the soil layer excavation depth, the surrounding environment, earth excavation and transportation equipment (7) and the like, and the principle of first support and then excavation is followed from top to bottom; when the foundation pit is deep, the earthwork excavation is performed stage by stage, the upper layer is shallow, the earthwork of the first layer on the upper portion is directly excavated by the excavator, and under the condition that the construction working face is limited, the excavator is matched with the excavator at the position of the foundation pit sealing plate by the grab bucket machine to perform the earthwork excavation construction.
6. The semi-reverse construction method of the large-span corridor structure along the street according to claim 1, characterized in that, after the concrete of the inner support (6) reaches 80% strength in the fourth step, excavation for supporting the lower side earthwork is carried out, after the construction of the vertical column pile (8) constructed as a vertical support is completed, the upper steel pipe concrete structure column is connected with the horizontal inner support (6), and the temporary steel pipe column is connected with the angle iron support inner support (6) through a steel supporting plate.
7. The method for constructing the large-span corridor structure along the street in the semi-reverse mode according to the claim 1, wherein in the sixth step, the template of the corridor structure column (10) adopts an aluminum film, a jig frame is arranged at the supporting height of each foundation pit, and the jig frame is welded with the bracket of the corridor structure column (10) and is connected with the inner support (6) and/or the upright column pile (8) by using embedded parts.
8. The method for constructing the large-span corridor structure along the street in the semi-reverse mode according to the claim 7 is characterized in that the corridor structure column (10) is firstly designed into an operation platform required by steel bar binding, template supporting and concrete pouring, and is also designed into a protection design between the corridor structure column (10) construction and a corridor structure beam plate (13) construction working surface; the operation platform and the protection adopt hydraulic protection screen devices, each column is provided with one set of independent hydraulic protection screen system, and work such as reinforcement and formwork erection is facilitated.
9. The semi-top construction method of the street-following large-span corridor structure according to claim 8, wherein the corridor structure column (10) is a steel column, and the steel column comprises a square pipe column and a cross steel rib and/or an H-shaped steel rib which are connected with the inside of the square pipe column; gallery column concrete (101) and a gallery column inner rib (102) are poured inside the steel column; the square pipe column is horizontally and pre-embedded with an independent column climbing formwork system (12) at intervals, and the independent column climbing formwork system (12) comprises a climbing formwork connecting piece (121) and a climbing formwork platform (122) which are connected with the square pipe column; the creeping formwork platform (122) is correspondingly arranged around the corridor structure column (10).
10. The semi-top construction method of the street-following large-span corridor structure according to claim 9, wherein in the seventh step, the outer ends of all the steel bar connectors are arranged 15mm behind the pillar edge, and when the corridor structure beam plates (13) are constructed in the later period, pillar concrete is chiseled at the joint position.
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