CN107100649B - Construction process for inclined shaft concrete pouring - Google Patents
Construction process for inclined shaft concrete pouring Download PDFInfo
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- CN107100649B CN107100649B CN201710489257.1A CN201710489257A CN107100649B CN 107100649 B CN107100649 B CN 107100649B CN 201710489257 A CN201710489257 A CN 201710489257A CN 107100649 B CN107100649 B CN 107100649B
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- 238000010276 construction Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008569 process Effects 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 84
- 239000010959 steel Substances 0.000 claims abstract description 84
- 238000005452 bending Methods 0.000 claims abstract description 35
- 239000011435 rock Substances 0.000 claims abstract description 26
- 238000009434 installation Methods 0.000 claims abstract description 11
- 239000002689 soil Substances 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 238000012937 correction Methods 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 239000010410 layer Substances 0.000 claims description 19
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 17
- 239000004917 carbon fiber Substances 0.000 claims description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 230000009194 climbing Effects 0.000 claims description 8
- 238000009415 formwork Methods 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 239000004593 Epoxy Substances 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 238000004382 potting Methods 0.000 claims description 6
- 239000002023 wood Substances 0.000 claims description 6
- 239000004005 microsphere Substances 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
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- 238000007667 floating Methods 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 abstract description 12
- 238000007493 shaping process Methods 0.000 abstract description 7
- 238000004140 cleaning Methods 0.000 abstract description 3
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 13
- 229910052802 copper Inorganic materials 0.000 description 13
- 239000010949 copper Substances 0.000 description 13
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 9
- 238000009826 distribution Methods 0.000 description 8
- 238000009412 basement excavation Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
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- 239000000463 material Substances 0.000 description 3
- LFOIDLOIBZFWDO-UHFFFAOYSA-N 2-methoxy-6-[6-methoxy-4-[(3-phenylmethoxyphenyl)methoxy]-1-benzofuran-2-yl]imidazo[2,1-b][1,3,4]thiadiazole Chemical compound N1=C2SC(OC)=NN2C=C1C(OC1=CC(OC)=C2)=CC1=C2OCC(C=1)=CC=CC=1OCC1=CC=CC=C1 LFOIDLOIBZFWDO-UHFFFAOYSA-N 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000009751 slip forming Methods 0.000 description 2
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- 230000004048 modification Effects 0.000 description 1
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- 238000007569 slipcasting Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
the invention discloses a construction process for inclined shaft concrete pouring, which solves the problem that construction quality is difficult to ensure due to the fact that the inclined shaft has large span and different soil qualities of rock stratums, and has the technical scheme that the concrete pouring range of the inclined shaft comprises an upper bent section, a straight section, a lower bent section and a lower flat section, and the concrete construction steps are as follows: cleaning rock surfaces; paying off and separating bins; manufacturing and installing steel bars; a sliding mould is installed on the straight section of the inclined shaft; checking the radian and the flatness of the die surface of the shaping steel die at the upper bending section, the lower bending section and the lower flat section, coating a release agent, synchronously carrying out installation and correction, and reinforcing by adopting a shaping steel arch frame, a steel pipe and a lacing wire; installing an embedded part; installing a plugging head die; pouring concrete; demoulding and maintaining are carried out, and targeted construction is adopted for each section of the inclined shaft, so that the construction quality is improved.
Description
Technical Field
The invention relates to building construction, in particular to a construction process for inclined shaft concrete pouring.
background
In the late stage of the twentieth century and the eighties, China begins to build pumped storage power stations, the water head of each station is generally as high as hundreds of meters, the length of a water diversion inclined shaft correspondingly reaches hundreds of meters, the inclined shaft is a special building of an underground water diversion type hydropower station, concrete lining construction of the inclined shaft is a project with complex technology and great construction difficulty, and construction working conditions are complex.
According to the steep-dip large-diameter inclined shaft concrete lining slip form construction method disclosed by the patent with the publication number of CN1261672C, a hydraulic lifting system is installed on a steep-dip large-diameter long inclined shaft concrete lining slip form die body, the system consists of two continuous stretching type hydraulic jacks, a hydraulic pump station, a control console and a safety holder, and the hydraulic pump station is connected with the jacks through high-pressure oil pipes; operating the hydraulic pump station and the jack through the console to work; the hydraulic pump station is provided with a trap valve which can control the processing of the jack and prevent overload; two steel strands anchored on the top arch of the upper bending section are pulled out by two continuous stretching hydraulic jacks, a die body is drawn to slide up, and the stress direction of the die body is parallel to the axis of the inclined shaft; and the fixed end of the steel strand is anchored in the top arch surrounding rock of the upper bending section through drilling and grouting.
in the construction of the pressure pipeline inclined shaft, because the inclined shaft has large span, the soil quality of each rock stratum has difference, and the concrete pouring range of the inclined shaft comprises an upward bending section, a straight section, a downward bending section and a downward flat section, the construction is required in a pertinence manner, and the construction quality is difficult to ensure only by adopting slip form pouring.
disclosure of Invention
The invention aims to provide a construction process for inclined shaft concrete pouring, which aims at adopting targeted construction for each section of an inclined shaft so as to improve the construction quality.
the technical purpose of the invention is realized by the following technical scheme:
A construction process for inclined shaft concrete pouring comprises the following concrete construction steps:
(1) expanding the periphery of the section to a designed contour line by using an air pick or drilling blasting on an underexcavated section within the inclined shaft concrete pouring range, removing rock surface sundries, soil and rock ballast, flushing the rock surface by using a high-pressure water gun, and keeping the rock surface clean and moist;
(2) Measuring and setting out by using a total station, dividing bins within the concrete pouring range of the inclined shaft, and marking bin numbers at obvious positions;
(3) building sample frame steel bars, wherein the stressed steel bars are connected in a welding mode, the distributed steel bars are in binding and overlapping, when the steel bars are installed, a protective layer is reserved, and a concrete cushion block is supported and bound on the sample frame steel bars through embedded iron wires;
(4) A sliding mould is installed on the straight section of the inclined shaft, the radian and the flatness of the mould surface of the shaping steel mould are checked on the upper bending section, the lower bending section and the lower flat section, a release agent is coated, the installation and the correction are carried out synchronously, and a shaping steel arch frame, a steel pipe and a lacing wire are adopted for reinforcement;
(5) Drilling a drain hole or installing a drainage belt at the water seepage part of the wall of the inclined shaft, leading out a drainage pipe, and embedding a grouting pipe, a grounding and water stopping facility;
(6) Installing a plug die, pouring concrete into the inclined shaft, and vibrating the concrete until air bubbles are discharged and the surface of the concrete is subjected to slurry overflow;
(7) and (3) forming concrete, demolding, watering and curing for more than 28 days, intermittently spraying and curing, creating microclimate on the warehouse surface, and keeping the concrete moist.
By adopting the technical scheme, due to the difference of soil layers, the inclined shaft which has completed excavation and support construction has the phenomenon of over-excavation and under-excavation, the precision of enlarging rock surface faults by the air pick is high, but the required quantity of constructors is large, the speed is low, the drilling and blasting precision is low, the danger is greater than that of the air pick, but the inclined shaft has the characteristics of less required constructors, high excavation speed and convenient treatment, and the corresponding treatment mode is selected according to the under-excavation amount of an under-excavated section, so that the construction period is shortened, and the rock surface quality is improved; the rock surface is flushed by a high-pressure water gun, so that the rock surface is kept clean and wet, cracking of the rock surface in the pouring process is avoided, and the firmness of concrete and the rock surface is improved; deformation influences such as expansion, temperature and the like are reduced through the warehouse division construction; the design of the concrete cushion block plays a role in protection, the reinforcing steel bars are not attached to the rock wall in the pouring process, the reinforcing steel bars are not staggered, and the embedded iron wires are bound on the reinforcing steel bars of the sample frame to stabilize the connection firmness between the concrete cushion block and the reinforcing steel bars; through the separated construction of the straight section, the upper bending section, the lower bending section and the lower flat section, the slip form construction has the characteristics of high degree of mechanization, high construction speed, small occupied site, strong structural integrity, good anti-seismic performance, guaranteed safe operation and remarkable comprehensive environmental and economic benefits, and is applied to the straight section of the inclined shaft; the water seepage part of the rock wall has small-area water seepage and large-area water seepage so as to install the drain holes to treat the small-area water seepage, the installation of the drainage belt to treat the large-area water seepage is simple and convenient, the installation of the drainage belt is difficult, but the influence on the rock surface structure is small; vibrating the concrete until bubbles are discharged and the surface is flooded, so as to ensure that the upper and lower layers of concrete are well combined; after curing, the concrete is completely formed.
Preferably, in the concrete curing process in the step (7), a wind shielding door curtain is arranged at the downward bending section of the inclined shaft, and a linen cover is arranged on the bottom arch.
Through adopting above-mentioned technical scheme, set up the door curtain that keeps out the wind with the canvas in the curved section position in inclined shaft, the end arch concrete can adopt the burlap to cover, can reduce the moisture on concrete surface and scatter and disappear, prevents "cross the hall wind" to the influence of concrete quality, makes the concrete keep the humid state.
preferably, the plug template of the straight section of the inclined shaft is made of a 3cm thick wood board and is arranged at the intersection of the straight section and the lower bent section of the inclined shaft, and the size of the plug template is 10 ~ 20mm smaller than the structural size of the plug template.
By adopting the technical scheme, the plug template is 10 ~ 20mm smaller than the structural size so that the slip form can smoothly slide out without disturbing concrete.
preferably, the straight section of the inclined shaft is coated with the primary concrete pulp between initial setting and final setting of the concrete.
by adopting the technical scheme, the outer surface of the concrete formed looks flat, uneven surface caused by slip form is eliminated, and hollowing and cracking are avoided.
Preferably, the distributed reinforcing steel bars of the straight section of the inclined shaft are bound while sliding when concrete is poured.
by adopting the technical scheme, the distributed steel bars can be bound while sliding, so that the working efficiency of the sliding mode process can be further improved, the sliding mode can be used as an operation platform, and the excessive operation platform is not required to be built.
Preferably, the slip form comprises a center sill, a slip form travelling mechanism, an operation platform, a template system, a plastering platform, a tail platform, a wellhead locking beam and a hydraulic climbing system.
By adopting the technical scheme, the straight concrete pouring is completed by utilizing the slip form, and the rear temporary travelling wheel in the slip form travelling mechanism is better utilized to solve the construction problem that the lower triangular concrete is continuously, stably and excessively conveyed to the lined concrete surface by the slip form travelling wheel, so that the material conveying trolley easily conveys personnel and materials from top to bottom safely and stably, and the construction speed and the construction quality are greatly improved.
Preferably, the inclined shaft is cast after scaffold platforms are partially erected at the upper bending end, the lower bending section and the lower flat section, the bottom arch and the side top arch are cast in layers, and the bottom arch is cast first and the side top arch is cast later.
by adopting the technical scheme, the large-volume concrete is mainly aimed at preventing the concentrated and overlarge hydration heat and generating temperature cracks, and the hydration heat peak can be reduced by layered pouring, so that the heat dissipation is facilitated.
preferably, the stressed steel bars of the upper bent end, the lower bent section and the lower flat section of the inclined shaft are installed after the scaffold platform is erected, the bottom arch is used for binding and distributing the steel bars before the formwork is installed, and the side top arch is used for binding and distributing the steel bars after the formwork is installed.
Through adopting above-mentioned technical scheme, the bottom arch is encircleed with the limit top because geological conditions and position are different, and the bottom arch setting plays with the bottom, and earlier ligature distribution reinforcing bar plays and strengthens the support effect, avoids because the atress reinforcing bar takes place to deform under the template pressurized, encircles ligature distribution reinforcing bar at the limit top after the installation template, and the template can play the positioning action, and then easy to assemble.
Preferably, the scaffold platform comprises a main beam and a secondary beam, the main beam is two layers of I-shaped steel, the secondary beam is a single layer of I-shaped steel, a 5cm thick wood board is fully paved on the platform, and the platform is firmly bound by iron wires.
through adopting above-mentioned technical scheme, the girder needs higher structural strength to two-layer I-steel is built, and the secondary beam plays the distribution effect, alleviates self weight with the individual layer I-steel, and then reduces the girder pressurized, and the convenience of laying of plank is walked around.
preferably, be provided with the steel skeleton in the construction joint and wear to establish the carbon fiber pencil between the steel skeleton, still be provided with a plurality of porous microballs between the carbon fiber pencil, still pack between being located steel skeleton and the carbon fiber pencil in the construction joint and have epoxy filling adhesive, the port of construction joint is passed through the sealing rod and is sealed.
through adopting above-mentioned technical scheme, seal the construction joint terminal surface through the sealing rod, regard as the bed frame with the steel skeleton, the carbon fiber pencil plays the water conservancy diversion effect when filling the epoxy potting compound, and regard as the distribution skeleton of steel skeleton, further play the effect of additional strengthening structure intensity, further form the structure of alternating through porous microsphere, strengthen the firm in connection degree between epoxy potting compound and steel skeleton and the carbon fiber pencil, and then play the sealed effect of preferred, leak in avoiding the rock and ooze from the construction joint.
in conclusion, the invention has the following beneficial effects:
1. According to the construction process for the inclined shaft concrete pouring, the straight section of the inclined shaft, the downward bending section, the upward bending section and the downward flat section are separately constructed, after the straight section is constructed, the downward bending section and the upward bending section can be constructed simultaneously, so that the construction time is saved, the straight section inclined shaft is poured through the sliding formwork system, the working time is saved, the building of a scaffold is saved, and the problem that a shaping formwork is easy to deform in the formwork climbing process is solved;
2. The construction process for the inclined shaft concrete pouring creates a small environment of a cabin surface through spray maintenance and the design of a wind shielding door curtain and linen, maintains the humidity inside the inclined shaft, and reduces the water loss on the surface of concrete;
3. According to the construction process for the inclined shaft concrete pouring, the concrete is prevented from being concentrated and overlarge in hydration heat and generating temperature cracks through separated bin layered pouring, hydration heat peaks can be reduced through layered pouring, and heat dissipation is facilitated.
Description of the drawings
FIG. 1 is an overall flow diagram of a construction process for inclined shaft concrete pouring;
FIG. 2 is a schematic structural view of a sliding mode system;
FIG. 3 is a schematic view of a slant well sub-chamber;
FIG. 4 is a schematic cross-sectional view of a construction joint.
In the figure, 1, straight section; 2. a downward bending section; 3. an upward bending section; 4. a lower flat section; 5. constructing a joint; 51. porous microspheres; 52. a carbon fiber bundle; 53. a steel skeleton; 54. epoxy potting adhesive; 61. A middle beam; 62. a slip form running mechanism; 63. an operating platform; 64. a template system; 65. a plastering platform; 66. a tail platform; 67. a wellhead lock beam; 68. a hydraulic climbing system; 69. a wellhead platform.
Detailed Description
the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a construction process for inclined shaft concrete pouring is applied to arrangement of a diversion tunnel inclined shaft in underground engineering of a hydropower station. And performing lining concrete pouring construction on an upper bent section 3, a straight section 1, a lower bent section 2 and a lower flat section 4 of the inclined shaft which is subjected to excavation and support construction.
Referring to fig. 2, concrete is cast in the straight section 1 of the slant shaft by slip casting. The slip form comprises a middle beam 61, a slip form walking mechanism 62, an operation platform 63, a template system 64, a plastering platform 65, a tail platform 66, a wellhead locking beam 67 and a hydraulic climbing system 68. The sliding of the slip form is powered by a hydraulic climbing system 68. The hydraulic climbing system 68 one end is fixed on the well head locking beam 67 of inclined shaft upper end well head department, and the other end passes through hydraulic jack to be fixed on well head 61, and the centre is connected through the steel cable, when the intensity of concrete possesses the slip-lift condition, starts hydraulic climbing system 68, thereby utilizes the creeping of hydraulic jack on the steel cable to drive the slipform and upwards move together.
The method comprises the following steps: bedrock treatment
1. determining a partial undermined section of the inclined shaft which is subjected to excavation supporting construction through measurement;
2. drilling and blasting large-area (not less than 10 square meters) underdug land sections;
3. processing the under-dug sections with small areas (less than 10 square meters) by manually matching with pneumatic picks, so that the perimeter of the end face of the well wall is expanded to a design contour line;
4. The method comprises the following steps of manually cleaning sundries, soil, ballast and loose soil blocks in the range of concrete pouring required by the rock surface, and keeping the rock surface free of loose ballast, dust and impurities;
5. Flushing the rock surface by a high-pressure water gun or a high-pressure air gun to keep the rock surface clean and wet;
6. And (4) acceptance and acceptance are qualified.
Step two: measuring sub-bin
1. Measuring and paying off an upper bent section 3, a straight section 1, a lower bent section 2 and a lower flat section 4 of the inclined shaft by using a total station, determining and setting marks at obvious positions to mark an elevation and a central control point line;
2. referring to fig. 3, the straight section 1 and the lower flat section 412m of the inclined shaft are divided into bins, and the bent-up section 3 and the bent-down section 26 ~ 8m are divided into bins, and marks are arranged at obvious positions.
Step three: installation made by straight section steel bar
1. steel bars are batched according to the section size, and a test piece polarity mechanical property test and a mechanical property test are extracted;
2. reserving a reinforcing steel bar protection layer and adopting mutually staggered concrete cushion block support, wherein embedded iron wires are embedded in the concrete cushion blocks;
3. The atress reinforcing bar adopts load trailer car to transport to the corresponding storehouse face of straight section 1, ties up through pre-buried iron wire and concrete cushion, welds and the hanging wire according to elevation, central control point line, steel bar welded's overlap joint length: the single-side welding is 10d, and the double-side welding is 5 d.
Step four: straight section slip form mounting
1. The bottom of the inclined underground bent section 2 is expanded and dug into a straight flat bottom, and a temporary track is installed;
2. an inlet platform is arranged on the upper bending section 3 of the inclined shaft, and a wellhead locking beam 67 is arranged;
3. after the inclined shaft sliding mode rail is installed on the inclined shaft straight section 1, a temporary rail is installed in the sliding mode installation area and connected with the temporary rail of the inclined shaft downward bending section 2;
4. The inclined shaft slip form walking mechanism 62 and the middle beam 61 are hoisted by a crane to be pre-assembled in a flat tunnel close to the inclined shaft lower bent section 2, and are matched with a traction walking mechanism (50 tons of steering pulleys) arranged on the inclined shaft lower bent section 2 and a track from the middle beam 61 to the straight section 1 of the inclined shaft lower bent section 2 by a 15 tons winch arranged on an inclined shaft well head;
5. After the middle beam 61 and the slip form traveling mechanism 62 are fixed, dragging the slip form to the downward bending section 2 by adopting a hoist arranged at the bottom of the downward bending section 2, dragging the slip form to an installation field at the tail end of the straight section 1 of the inclined shaft by adopting a winch arranged at the well head of the inclined shaft through a movable pulley block, and installing the slip form in a matched manner by using ground anchor piles (50 tons), steering pulleys (50 tons), a top hoisting point, a crane and the like arranged at the downward bending section 2 of the inclined shaft;
6. installing a plug template at the straight section 1 and the downward bending section 2 of the inclined shaft, wherein the plug template is installed at the intersection of the straight section 1 and the downward bending section 2 of the inclined shaft by adopting a 3cm thick wood board and is 10 ~ 20mm smaller than the sliding mode structure in size, the plug template positioned at the position of a water stop copper sheet is welded on a distribution steel bar by adopting a phi 12 pull-in steel bar, and after the galvanized flat steel penetrates out of the plug template, performing leakage stopping treatment by using foamed adhesive;
7. the distribution reinforcing bar adopts load trailer car to transport to corresponding storehouse face, arranges the inboard of atress reinforcing bar in through hanging wire ligature overlap joint, reinforcement's overlap joint length: the tensile force is 40d, and the compressive force is 30 d;
step five: straight section embedded part installation
1. A drainage hole is drilled on the water seepage part of the inclined shaft wall for the fissure water, a water pipe is arranged to be led out, and the drainage pipe is a thin-wall iron pipe with the diameter of 50 mm;
2. for large-area seepage of the seepage part of the inclined shaft well wall, a drainage belt is adopted for centralized diversion, interception and drainage;
3. Arranging a water-stopping copper sheet at the structural joint or the construction joint 5, wherein the water-stopping copper sheet is installed and reinforced by adopting necessary fixing measures such as a phi 12 steel bar hook, a fixing frame and the like, a groove of the water-stopping copper sheet is required to be placed at a parting position, the water-stopping copper sheet is tightly combined with a template, a joint of the water-stopping copper sheet adopts double-sided welding, the lap joint length is not less than 2cm, and the water-stopping copper sheet in the bin is supported on the structural steel bar by adopting a;
4. arranging grounding galvanized flat steel above an arch of the bottom of the inclined shaft, embedding a grouting pipe, wherein the embedded backfilling grouting pipe adopts a thin-wall iron pipe with the diameter of 50mm, and the embedded consolidation grouting pipe adopts a thin-wall iron pipe with the diameter of 80 mm;
5. setting a construction joint 5 and performing roughening treatment, and setting a key groove on the surface of the construction joint 5;
6. referring to fig. 4, a steel skeleton 53 is arranged in the construction joint 5, and the steel skeleton 53 is in a structure of mutually penetrating in the longitude and latitude directions;
7. the carbon fiber bundle 52 is wound on the steel framework 53, the carbon fiber bundle 52 penetrates through the steel framework 53 and is wound on the steel framework 53, and a plurality of porous microspheres 51 are equidistantly sleeved on the carbon fiber bundle 52;
8. epoxy potting compound 54 is filled between the steel skeleton 53 and the carbon fiber bundle 52 in the construction joint 5;
9. the port of the construction joint 5 is sealed by a rubber water stop strip.
Step six: straight section concrete pouring
1. pouring concrete from bottom to top, conveying the concrete to a wellhead platform 69 of an inclined shaft by using a 6 ~ 8m3 mixer truck, conveying the concrete to a slip-form storage bin by using a conveying trolley, warehousing the concrete by using a manual trolley, warehousing the concrete by using a chute when the concrete is poured to the starting point position of the wellhead conveying trolley, controlling the warehousing slump to be between 8 and 10cm, performing warehousing from low to high in a sequence, wherein the concrete is symmetrically and uniformly discharged on the circumference when being discharged so that the whole circumference is horizontally and uniformly raised, leveling the concrete by using necessary tools such as shovels, triangular rakes and the like in the leveling process, so that vibration leakage, over-vibration, aggregate concentration and the like are avoided, the concrete poured into the silo is leveled along with the pouring without accumulation, if aggregates are accumulated in the silo, the manual leveling and vibration are timely adopted,
2. the concrete is vibrated by adopting an inserted vibrator, the vibrator is quickly inserted and slowly pulled when being inserted and withdrawn, the insertion distance of the vibrator is controlled within 1.5 times of the effective acting radius of the vibrator, the vibrating time is 30-50 seconds, and the concrete does not obviously sink any more, bubbles are discharged and the surface is subjected to surface slurrying; the vertical distance between the vibrator and the template is not less than 1/2 of the effective vibration radius, and the reinforcing steel bars and embedded parts are not required to be touched. When the upper concrete layer is vibrated, the vibrating rod is inserted into the lower concrete layer by about 5cm, so that the upper concrete layer and the lower concrete layer are well combined; vibrating the concrete until air bubbles are discharged and the surface of the concrete is flooded;
3. when the concrete is poured, the sliding die set and the middle beam 61 are in a locking state, when the strength of the concrete reaches 0.2-0.25 MPa, the sliding die can slide up, the sliding speed of the template is not more than 25cm/h, and the sliding up is about 4-5 m each day in the early stage of pouring; in the later stage of pouring, the water slides up by about 5-8 m every day;
4. The distribution reinforcing bar adopts load trailer car to transport to slipform smooth lift storehouse face, arranges the inboard of atress reinforcing bar in through hanging wire ligature overlap joint, reinforcement's overlap joint length: the tensile force is 40d, and the compressive force is 30 d;
5. after the slip form slides and rises, in the time period from initial setting to final setting of concrete, workers stand on the slip form hanging platform to perform plastering and finishing by adopting the concrete raw stock.
step seven: steel bar installation of upper bending section, lower bending section and lower flat section
1. building a scaffold platform, wherein the scaffold platform comprises a main beam made of two layers of I-shaped steel and a secondary beam made of single-layer I-shaped steel, iron wires are lifted between the main beam and the secondary beam for binding, the distance between the main beams is 120 x 120cm, and continuous cross braces are arranged at intervals of 600 ~ 720cm in the longitudinal direction and the transverse direction;
2. Paving a thick wood board with the thickness of 5cm on the scaffold platform for workers to walk, wherein the cloth distance is 150 cm;
3. Steel bars are batched according to the section size, and a test piece polarity mechanical property test and a mechanical property test are extracted;
4. reserving a reinforcing steel bar protection layer and adopting mutually staggered concrete cushion block support, wherein embedded iron wires are embedded in the concrete cushion blocks;
5. the atress reinforcing bar that is located end arch and limit top arch adopts the load trailer car to transport to the corresponding storehouse face of bent section 3, lower bent section 2, lower flat section 4, ties up through pre-buried iron wire and concrete cushion, welds and the hanging wire according to elevation, central control dotted line, steel bar welded overlap joint length: the single-side welding is 10d, and the double-side welding is 5 d;
6. The distribution reinforcing bar that is located the end arch adopts load trailer wagon to transport to the corresponding storehouse face of bent section 3, lower bent section 2, lower flat section 4, arranges the inboard of atress reinforcing bar in through hanging wire ligature overlap joint, reinforcement's overlap joint length: under tension of 40d and under compression of 30 d.
step seven: installing templates of an upper bending section, a lower bending section and a lower flat section
1. adopting a cambered surface shaping steel template, wherein the profile steel, the steel plate and the bolt are all made of Q235 steel, and the thickness of the steel template panel is more than 2.5 mm;
2. assembling steel templates, wherein dislocation is less than 1.5mm, clearance is less than 2mm, hole site tolerance is +/-0.5 mm, and hole pitch is +/-1 mm;
3. cleaning a template panel, uniformly coating a release agent, adhering a double faced adhesive tape to a bottom opening of the template, installing the template, assembling and correcting during the installation process, and correcting the flatness of verticality and the rise height;
4. the shaping steel template is reinforced by a directional steel arch frame and a vertical phi 48mm steel pipe phi 12mm lacing wire, the lacing wire is reinforced by a positioning taper sleeve, and after the template is dismantled, pre-shrinking mortar is used for taper sleeve treatment.
Step eight: installing embedded parts of upper bending section, lower bending section and lower flat section
1. a drainage hole is drilled on the water seepage part of the inclined shaft wall for the fissure water, a water pipe is arranged to be led out, and the drainage pipe is a thin-wall iron pipe with the diameter of 50 mm;
2. For large-area seepage of the seepage part of the inclined shaft well wall, a drainage belt is adopted for centralized diversion, interception and drainage;
3. Arranging a water-stopping copper sheet at the structural joint or the construction joint 5, wherein the water-stopping copper sheet is installed and reinforced by adopting necessary fixing measures such as a phi 12 steel bar hook, a fixing frame and the like, a groove of the water-stopping copper sheet is required to be placed at a parting position, the water-stopping copper sheet is tightly combined with a template, a joint of the water-stopping copper sheet adopts double-sided welding, the lap joint length is not less than 2cm, and the water-stopping copper sheet in the bin is supported on the structural steel bar by adopting a;
4. Arranging grounding galvanized flat steel above an arch of the bottom of the inclined shaft, embedding a grouting pipe, wherein the embedded backfilling grouting pipe adopts a thin-wall iron pipe with the diameter of 50mm, and the embedded consolidation grouting pipe adopts a thin-wall iron pipe with the diameter of 80 mm;
5. Setting a construction joint 5 and performing roughening treatment, and setting a key groove on the surface of the construction joint 5;
6. A steel skeleton 53 is arranged in the construction joint 5, and the steel skeleton 53 is of a structure which is mutually penetrated and connected in the longitude and latitude directions;
7. the carbon fiber bundle 52 is wound on the steel framework 53, the carbon fiber bundle 52 penetrates through the steel framework 53 and is wound on the steel framework 53, and a plurality of porous microspheres 51 are equidistantly sleeved on the carbon fiber bundle 52;
8. epoxy potting compound 54 is filled between the steel skeleton 53 and the carbon fiber bundle 52 in the construction joint 5;
9. The port of the construction joint 5 is sealed by a rubber water stop strip.
Step nine: concrete pouring of upper bent section, lower bent section and lower flat section
1. Concrete of the lower flat section 4 is pumped into a bin by an HBT60 type trailer pump, concrete of the upper bent section 3 and the lower bent section 2 is pumped into the bin by a high-pressure trailer pump, two sides in the bin are divided by a chute and a chute pipe, the top arch concrete of the lower flat section 4 is conveyed to the top from a cupola hole by a guide pipe and then divided to two sides, rubber hoses with the diameter of 200mm are connected to walls of two sides, the distance between the opening of a discharge pipe and a pouring surface is 50 ~ ~ 100cm, and the concrete is uniformly discharged by manual traction;
2. the concrete is poured in layers from low to high, the bottom arch is poured firstly at 110 degrees, then the side top arch is poured within 250 degrees, the paving layering thickness is 50cm, the materials are evenly discharged in a bilateral symmetry mode, and the pouring ascending speed is controlled at 0.8 m/h;
3. the concrete is vibrated by an inserted vibrator. The 'fast-inserting slow-pulling' is realized when the vibrator is inserted and withdrawn, the insertion distance of the vibrator is controlled within 1.5 times of the effective acting radius of the vibrator, the vibrating time is 30-50 seconds, and the concrete does not obviously sink any more until bubbles are discharged and the surface of the concrete is subjected to slurry overflow; the vertical distance between the vibrator and the template is not less than 1/2 of the effective vibration radius, and the reinforcing steel bars and embedded parts are not required to be touched; when the upper concrete layer is vibrated, the vibrating rod is inserted into the lower concrete layer by about 5cm, so that the upper concrete layer and the lower concrete layer are well combined, and the concrete is vibrated until bubbles are discharged and the surface is subjected to surface slurrying.
Step ten: concrete curing
after concrete pouring is finished, 12 ~ 18h is timely and manually watered for maintenance, a wind screen door curtain is erected at the position of a lower bent section 2 of the inclined shaft by canvas, bottom arch concrete can be covered by linen to prevent 'cross wind' from influencing the concrete quality, a high-pressure water pipe is arranged on a sliding mould for maintenance at the straight section 1 of the inclined shaft, the maintenance is carried out from 5m below the sliding mould, a plug template is removed, top arch concrete is maintained by simple maintenance trolley in a sprinkling mode, intermittent spraying maintenance is carried out under the dry and hot weather conditions, microclimate on the surface of a warehouse is built, the concrete is kept moist, and after the maintenance is carried out for more than 28 days, the formed concrete is obtained.
the present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. the utility model provides a construction technology for inclined shaft concrete placement, its characterized in that, the concrete placement scope of inclined shaft is including last curved section (3), straight section (1), down curved section (2) and lower flat section (4), and concrete construction steps are as follows:
(1) Expanding the periphery of the section to a designed contour line by using an air pick or drilling blasting on an underexcavated section within the inclined shaft concrete pouring range, removing rock surface sundries, soil and rock ballast, flushing the rock surface by using a high-pressure water gun, and keeping the rock surface clean and moist;
(2) Measuring and setting out by using a total station, dividing bins within the concrete pouring range of the inclined shaft, and marking bin numbers at obvious positions;
(3) Building sample frame steel bars, wherein the stressed steel bars are connected in a welding mode, the distributed steel bars are in binding and overlapping, when the steel bars are installed, a protective layer is reserved, and a concrete cushion block is supported and bound on the sample frame steel bars through embedded iron wires;
(4) A sliding mould is installed on the straight section (1) of the inclined shaft, the radian and the flatness of the mould surface of the shaped steel mould are checked on the upper bending section (3), the lower bending section (2) and the lower flat section (4), a release agent is coated, the installation and the correction are carried out synchronously, and a shaped steel arch frame, a steel pipe and a lacing wire are adopted for reinforcement;
(5) a drainage hole is drilled or a drainage belt is installed on the water seepage part of the inclined shaft well wall, a drainage pipe is led out, a grouting pipe, a grounding and water stopping facility is embedded, the water stopping facility is specifically a construction joint (5), steel frameworks (53) and carbon fiber harnesses (52) penetrating between the steel frameworks (53) are arranged in the construction joint (5), a plurality of porous microspheres (51) are further arranged between the carbon fiber harnesses (52), epoxy potting adhesive (54) is further filled between the steel frameworks (53) and the carbon fiber harnesses (52) in the construction joint (5), and ports of the construction joint (5) are sealed through water stopping strips;
(6) Installing a plug die, pouring concrete into the inclined shaft, and vibrating the concrete until air bubbles are discharged and the surface of the concrete is subjected to slurry overflow;
(7) And (3) forming concrete, demolding, watering and curing for more than 28 days, intermittently spraying and curing, creating microclimate on the warehouse surface, and keeping the concrete moist.
2. the construction process for the concrete pouring of the inclined shaft according to the claim 1, wherein in the concrete curing process in the step (7), a wind shielding door curtain is arranged on the lower bent section (2) of the inclined shaft, and a linen cover is arranged on the bottom arch.
3. the construction process for the concrete pouring of the inclined shaft according to the claim 1, characterized in that a partial plug template of the straight section (1) of the inclined shaft is installed at the intersection of the straight section (1) of the inclined shaft and the downward bending section (2) by a 3cm thick wood board, and the plug template is 10 ~ 20mm smaller than the structure size.
4. The construction process for inclined shaft concrete pouring according to the claim 3, characterized in that the inclined shaft straight section (1) is partially coated with the primary concrete slurry between the initial setting and the final setting of the concrete.
5. the construction process for inclined shaft concrete pouring according to the claim 3, characterized in that the distributed steel bars of the inclined shaft straight section (1) part are bound while sliding during the concrete pouring.
6. the construction process for inclined shaft concrete pouring according to claim 3, characterized in that the slipform comprises a centre beam (61), a slipform running gear (62), an operating platform (63), a formwork system (64), a floating platform (65), a tail platform (66), a wellhead locking beam (67), a hydraulic climbing system (68).
7. The construction process for the concrete pouring of the inclined shaft according to the claim 1, characterized in that the concrete pouring is carried out after the scaffold platforms are partially erected on the upper bent end, the lower bent section (2) and the lower flat section (4) of the inclined shaft, the bottom arch and the side top arch are layered, and the bottom arch is poured firstly and the side top arch is poured secondly.
8. The construction process for the concrete pouring of the inclined shaft according to the claim 7, characterized in that the partially stressed steel bars of the upper bent end, the lower bent section (2) and the lower flat section (4) of the inclined shaft are installed after the scaffold platform is set up, the bottom arch is used for binding the distributed steel bars before the formwork is installed, and the side top arch is used for binding the distributed steel bars after the formwork is installed.
9. the construction process for inclined shaft concrete pouring according to claim 8, wherein the scaffold platform comprises a main beam and a secondary beam, the main beam is two layers of I-shaped steel, the secondary beam is a single layer of I-shaped steel, a 5cm thick wood board is fully paved on the platform, and the platform is bound firmly by iron wires.
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| CN109026013A (en) * | 2018-09-13 | 2018-12-18 | 中国水利水电第五工程局有限公司 | A kind of vertical shaft slide model concrete calendering device and calendering method |
| CN109356161B (en) * | 2018-11-23 | 2021-04-06 | 中国水利水电第七工程局有限公司 | Low-layer high-frequency inclined surface layered concrete pouring method for large-scale hydropower well bent pipe section |
| CN115182753B (en) * | 2022-07-29 | 2023-02-14 | 中国水利水电第三工程局有限公司 | Inclined shaft S-shaped full-section lining template system and lining construction method |
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