CN102937027B - A kind of construction method of edge top arch and bottom arch of concrete pouring tunnel - Google Patents

Abstract

Construction method of edge top arch and bottom arch of concrete pouring tunnel relates to the construction method in a kind of concreting tunnel.Mainly invent for solving existing concreting constructing tunnel high in cost of production problem.To the tunnel that need to construct, first construction end arch, pouring sequentially of rear construction side and roof arch.End arch uses overmolded to wipe one's face, and side and roof arch uses the technique that integral movable type steel pipe scaffold configuration steel form carries out constructing.Pour arch construction method at the bottom of tunnel: scar cleaning, basis are checked and accepted；Surveying setting-out；Reinforcement installation；Model sheetinstallat；Pre-embedment grouting pipe and sealing, the installation of ground connection band iron；Locking plug template is installed；Bring down stocks to check and accept；Concreting；Overmolded, wipe one's face；Maintenance.Pour the construction method of tunnel side and roof arch: clear base and treatment of construction joints, flushing；Integral movable type bearing frame is set up, surveying setting-out and steel arch-shelf are installed；Template assembly；Reinforcing bar and installation of embedded parts；Bring down stocks to check and accept；Concreting；Template, bow member etc. are removed；Maintenance.Advantage is that construction cost is low.

Description

A kind of construction method of edge top arch and bottom arch of concrete pouring tunnel

Technical field:

The present invention relates to the construction method of limit, a kind of concreting tunnel arch top and bottom arch.

Background technology:

At present, at the bottom of concreting tunnel, the construction technology of arch is to be directed to shaping structures needs Carrying out formwork reinforcement, after concreting completes, the end for circular cross section, encircles, and easily occurs The defects such as concrete bubble, pitted skin, honeycomb, intractability is big, the longest, and cost is high.Carry out During the vault concreting of limit, need to individually set up the support systems such as steel pipe scaffold, utilize scattered Little steel form and plank sheathing carry out assembled shaping, template is immovable, needs after having poured Form removal, removes framed bent, sets up framed bent the most again, shuttering, pours next storehouse concrete, And using the telescoping steel form that producer customizes, it is impossible to recycling, cost is high, is limited by construction cost System, it is impossible to large-scale use, the longest during the construction of the most existing construction technology, efficiency is low, executes Work cost is high.

Summary of the invention:

The technical problem to be solved be to provide a kind of limit, concreting tunnel vault and The construction method of end arch, the tunnel side and roof arch poured in the method is difficult to concrete bubble, fiber crops occur The defect such as face, honeycomb, and template can move, and can increase substantially construction efficiency, reduces Construction cost.

Above-mentioned purpose is achieved in that for the circular cross section tunnel needing to carry out concrete-liner construction Road, uses the end arch in the range of 120 ° of below circular shape tunnel center of first constructing, side and roof arch of constructing afterwards Pour order；Arch at the bottom of reinforced concrete lining layer section uses overmolded to wipe one's face construction technology, side and roof arch Use the technique that integral movable type steel pipe scaffold configuration steel form carries out constructing；Portable pin hand The a length of 12m of frame, uses two sections (every section of 6.0m) to flexibly connect, and whole turnaround section is by some Broken line smoothly transition replaces arc to turn；

One, pour at the bottom of tunnel the construction method of arch:

The cleaning of a, scar, basis are checked and accepted:

Foreign material, earth, loosening block and concrete spray in the range of artificial removing concreting Layer, owes to dig location and utilizes hand fit's pneumatic pick to process until qualified, and use height local Blow wash is clean；Some of the joint bar of Φ 25mm, joint bar is first set before end arch reinforcing bar peace system Between array pitch be 2.0 × 1.5m, expose 20cm；When end arch reinforcing bar binding, then this can be utilized to insert Muscle welds with end arch reinforced frame stud, surveying party measuring go out dotted line, welds reinforcement installation sample rack, So as end arch reinforcing bar binding and formwork erection；

B, surveying setting-out:

Total powerstation is used to measure unwrapping wire, by piecemeal pile No., elevation, centreline control point line It is indicated in obvious fixed position；

C, reinforcement fabrication, transport and install:

Reinforcing bar unification, by the machine-shaping of reinforcing bar factory, is transported near working face, carry out reinforcing bar binding or Sleeve connection；

Reinforcement installation pre-test team accurately releases concrete flow-passing surface elevation, by measuring the height released Journey point is by Mian Wai two ends, storehouse 1m weldering sample rack reinforcing bar hanging wire, in order to control the sample rack muscle in face, storehouse Elevation；Hoop support muscle is Φ 25mm reinforcing bar, spacing 1.5m；Φ 25mm sample rack is welded on support muscle Reinforcing bar, along axis spacing 2m, is welded into reinforced frame；Bottom does not set the position of template, should weld one yet Sample rack reinforcing bar, in case setting-out uses；Steel reinforced concrete protective layer uses between reinforcing bar and template Intensity is set and is not less than the concrete pad of structure design strength；Cushion block should bury iron wire and steel underground Muscle is tightened；Cushion block should be staggered mutually, dispersed placement；

Scraping rail uses the arc of φ 12mm round steel to scrape rail, spacing 1.0～2.0m；By surveying setting-out Concrete surface design altitude be welded on scraping rail on the stud of reinforced frame, it is ensured that scrape rail firm not Deformation；Requiring when testing mould before concreting to check simultaneously and scrape rail elevation, concrete coating divides three Sequence is carried out, and cuts off and scrapes rail, cut off with mortar levelling and stay when scraping rail before carrying out the second sequence and wiping one's face Pit-hole；

Scraper plate uses Light Aluminum Alloy ruler or the lumps of wood of 3m length, and two ends are carried on a shoulder pole respectively and scraped on rail, Any excess concrete is blown off, reaches height and fill out low effect, utilize with this elevation scraping rail to control Base plate processed (below circular shape tunnel graticule) receipts face elevation；

D, model sheetinstallat:

It is 3.25 meters that base plate (arch) pours storehouse height.The fixing employing φ 12mm lacing wire of template Supporting, φ 12mm lacing wire firmly must be welded with the anchor pole (or joint bar) beaten on rock, by The phenomenon such as bubble, pitted skin, therefore 30 ° of models bottom base plate easily occurred when lower concrete pours Enclose not shuttering, sizing sample rack be installed and carry out troweling shaping, each 45 ° of scopes in base plate both sides due to Counter-slope is excessive, uses turn-over form construction, and turn-over form uses two pieces of 1.0m × 1.5m sizing arcs Shape template assembly, before concrete initial set, form removal is wiped one's face, in concreting process Overmolded at twice: turning over for the first time the template torn open in the range of foot two row's lacing wire, second time is turned over and torn open Template in the range of topmost two row's lacing wire, first cuts off lacing wire, it is desirable to lacing wire head does not has before wiping one's face Enter in concrete and fill and lead up with mortar after 5cm, the template φ 32mm in the range of two rows lacing wire Arc back of the body load separately blanking processing (includes the arc back of the body load of a φ 32mm) in template, turnover Use；

E, pre-embedment grouting pipe and sealing, ground connection band iron are installed:

Appraising and deciding dull whole grout hole aperture according to engineering, such as grout hole aperture adjustment is Φ 50mm, therefore grout hole pipe laying considers, with Φ 65mm steel pipe, to arrange that pressing cloth hole pattern performs；Grouting Pipe installation is painted after checking position inerrancy and is performed mark at template correspondence position, in order to Look for hole, mouth of pipe requirement cotton gauze or geotextiles closure after form removal, prevent concreting process In drop down and make the mouth of pipe be blocked into concrete；

The description of the pattern of sealing facility, size, burial place and material is according to construction drawing The regulation of paper；

Sealing piece to arrange some easy brackets when installing, and sealing piece is arranged on bracket, folder Tool is also secured on bracket, and rubber water-proof installation uses φ 6.5mm reinforcing bar to do tongs and fixes, Laying a tongs every 1～1.5m in the horizontal, rubber water-proof joint uses bonding method even Connect；

Sealing piece groove is strictly centrally located by seam face, and sealing piece is tight with template faying face；Peace The sealing piece installed is fixed and is protected, prevent from offseting in casting process, distort and Faying face spillage；

The burial place of ground connection band iron and the description of material and installation are strictly entered by design requirement OK, ground connection band iron to be welded by specification, protects and expose after concreting completes Earth tap；

F, locking plug template are installed:

Locking plug template selects the plank that common punching block or 3cm are thick, is welded in storehouse on anchor pole Lacing wire and beat on the dowel on the scar of basis fixing in advance；

G, bring down stocks, check and accept:

Before casting concrete, check and relevant pour preparation, including based process, template, Whether the built-in fittings such as reinforcing bar, grouting system, earthed system, observation instrument and sealing facility etc. are pressed Construction regulation performs；

H, concreting:

Concrete uses concrete pump pumping to put in storage, and poker vibrator vibrates；

First carry out logical storehouse from one end to other end when end arch concreting starts and be layered blanking also Fully vibrate, coagulation land reform when lower concrete is poured into from both sides angle mould end opening 10～20cm Concreting is carried out by both sides abutment wall blanking；Vibrate inside template and make concrete tamp both sides The bottom template of abutment wall inclined-plane template scope, the concrete that now base plate scope is unnecessary is the most artificial Being transported to both sides abutment wall blanking pour, successively stone is until parting elevation；

Concreting should be layered from low to high and carry out, and every layer thickness is 50cm, symmetrical all Even blanking, the concreting rate of climb controls at 0.5m/h；Concrete should with watering with closing a position, If produce aggregate accumulation, application is manually shoveled the position that mortar is more, it is to avoid thus produce Raw voids and pits；In concreting process, forbid to add water；As terminated for some reason, and exceed fair When being permitted interval time and initial set, should process by construction joint；If can the person of reinventing, may continue to pour Concrete, the standard reinvented is that vibrator vibrates 30s as a plug, 10cm inner concrete around Can also bleeding and hole of not boxing out be principle；

The principle of " fast inserting is pulled out slowly " is followed in vibrator operation, inserts about lower-layer concrete 5cm； Vibrator inserts the spacing of concrete and presses 1.5 times less than vibrator effective radius, away from template Distance is not less than 1/2 times of vibrator effective radius, and insertion position is quincuncial arrangement, keeps away as far as possible Exempt to touch reinforcing bar and built-in fitting, be aided with if desired and manually make closely knit, after twice discharging contact firm by ramming Place should strengthen vibrating；The vibrating time of single position is advisable with 15～30s, with concrete no longer Notable sinking, till occurring without bubble and starting bleeding；

I, overmolded, wipe one's face:

30 ° of arcuate extent of base plate, without template, organize peace during concreting to parting elevation immediately Row closes a position, wipes one's face, press polish work；It is close to scrape rail with floating rule middle without overmolded position to bottom Concrete leveling, then takes out and scrapes rail, finally carries out press polish with smearing shovel；

After concreting terminates, observe and grasp the solidification situation of concrete at any time, turn in time Mould is wiped one's face；Form removal at twice during concrete initial set；Before concrete coating, Carry out clear limit, removing mucilage, repair the work such as limit and unfilled corner；Face work is carried out at twice: The most smooth wipe one's face followed by vibrate carry out, reach height and fill out low purpose, make to rub extrusion Mortar is evenly distributed on concrete surface；Second time is wiped one's face and is and then carried out for the first time, makes Surface uniformity, makes panel meet flatness requirement；

Sufficient waterproof measure should be done before wiping one's face, forbid there is infiltration, drip etch concrete surface, And with ruler check table surface evenness；Should be specifically noted that interface position when wiping one's face, eliminate faulting of slab ends, And make it smooth；

The pre-buried grout pipe mouth of pipe should be found out when wiping one's face, and with a diameter slightly larger than grout pipe The stopper plug of diameter, on grout pipe, will be compacted floating by concrete about, treat that concrete has one When determining intensity, stopper is gently revolved taking-up, so that the concrete formation of the pre-embedment grouting pipe mouth of pipe is preferable；

Each pour is set up after model sheetinstallat terminates and is hung pin scaffold as operation platform, The pin platform that hangs set up is asked to keep 15～20cm distances from concrete surface；

J, maintenance:

Watering maintenance is proceeded by, to keep coagulation in 12～18h after concreting Soil surface often moistens, it is to avoid the generation in crack, and curing time is no less than 14 days；

Two, the construction method of tunnel side and roof arch is poured:

After end arch concrete reaches age strength, i.e. start attachment rail on end arch, carry out steel The assembling of muscle chassis and move integrally the assembling of frame；Prepare the pouring construction of side-top arch concrete； Its side-top arch concrete construction technology is as follows:

A, clear base and treatment of construction joints, flushing:

Before concreting, remove the foreign material on pneumatically placed concrete resilience ballast or basement rock, earth and Loosen rock, construction joint artificial chiseling, remove all outer skins on seam face, bulk material and pollution Body, with pressure flush of water clean after, drain ponding, keep cleaning；

B, integral movable type bearing frame are set up, surveying setting-out and steel arch-shelf are installed:

Side-top arch concrete construction uses 3.81 centimetres of steel pipes of φ to do bow member, top, limit arc formwork Supporting and assemble with four Pin Steel tubular arch-frame, steel pipe frame uses the full hall frame of integral movable type, longitudinally Array pitch is 0.6/0.9 rice, and horizontal array pitch is set up by 0.7 meter, and level course is set up away from by 0.9 meter, and Requirement adds bridging；Integral movable type bearing frame is set up and the supporting form of Steel tubular arch-frame；Row Frame uses total powerstation measuring bow member installation site and plug pile No. after having set up, the position that bow member is installed Put and be a little located on the integral movable type bearing frame set up；Side and roof arch rock face is carried out stifled The mark of head pile No., locking plug template is installed according to this mark；

C, template assembly:

Side-top arch concrete template uses P1015, P3015 punching block assembled, and outside Steel tubular arch-frame is made Back of the body load, calibration template, bow member Pin spacing is 0.6/0.9 rice, and formwork reinforcement uses and support is combined storehouse The mode inside adding inner support is carried out, and two side templates use horizontal steel tube to add the form of jacking so that more preferably Calibration template, top template use jack jacking after structural plane, add steel pipe in bottom Mode；Each storehouse seam areas, for ensureing that form joint is tight, can use in storehouse and old concrete Seam crossing adds row's lacing wire, and in concreting process, the rising along with concrete is progressively removed Inner supporting member in storehouse, locking plug template uses φ 12mm reinforcing bar to draw the mode combined with outer support to add in making Solid model plate；

D, reinforcing bar and installation of embedded parts:

Reinforcing bar and built-in fitting make in reinforcement yard, and reinforcement installation utilizes reinforcement trolley manually to tie up Pricking, with anchor pole, in order to rely on weld holder stud to fix, (position without anchor pole first sets joint bar, then welds Connecing bearing rod to fix, its method is identical with end arch joint bar with requirement)；

Rubber water-proof sheet is fixed with tongs when burying underground, and tongs is the steel using φ 6.5mm Muscle makes, and lays a tongs every 1～1.5m in the horizontal, and rubber water-proof joint uses Bonding method；Hole depth is the steel pipe of the consolidation grouting pipe employing φ 65mm of L=8m；

E, bring down stocks check and accept:

Before concreting, clear up the foreign material in position in storehouse, and rinse well, drain the water away；

F, concreting:

Concrete uses concrete pump pumping to put in storage, and poker vibrator vibrates；

Side-top arch concrete pours employing and puts in storage from crown position, the right and left hang slip bucket uniformly under Material, the discrepancy in elevation cannot be greater than 50cm, slips barrel discharging opening away from concrete surface about 1.5m, prevents bone Material separates, and manually closes a position, poker vibrator vibration compacting；Concrete slump controls Between 14～16cm, layering logical storehouse stone, receipts storehouse, top uses and moves back tube method；

G, template, bow member, steel pipe frame are removed:

After concrete reaches the demoulding strength that specification specifies, can form removal, bow member, steel pipe Frame；First removing the connecting tube in level course steel pipe during form removal, recycling bottle gouard moved by hands is by both sides steel Bow member inwardly pulls, and makes two side templates move with bow member and realizes the both sides demoulding；Remove whole the most again The steel pipe added bottom body movable stand, it is real that rotation jack makes movable stand slowly fall back on light rail The existing top demoulding；

Faulting of slab ends at form joint or projection are carried out polishing finishing；After bow member, form removable Find out the pre-embedment grouting pipe mouth of pipe in time, and line up is protected by；

H, maintenance:

After concreting terminates 12～18 hours, carrying out maintenance of sprinkling water, curing time is no less than 14 days；

After the invention have the advantage that concreting completes, the end for circular cross section, encircles, no There will be the defects such as concrete bubble, pitted skin, honeycomb, the construction cost of concrete defect processing can be saved； Can move due to template when carrying out limit vault and pouring, so construction efficiency can be increased substantially, Reduce construction cost, it is ensured that construction quality.

Detailed description of the invention:

For needing to carry out the circular cross section tunnel of concrete-liner construction, use circular shape tunnel of first constructing The end in the range of 120 ° below center, encircles, pouring sequentially of rear construction side and roof arch；Armored concrete Arch at the bottom of lining cutting section uses overmolded to wipe one's face construction technology, and side and roof arch uses integral movable type steel pipe feet hand The technique that frame configuration steel form carries out constructing；The a length of 12m of traveling centering, uses two sections Flexibly connecting, whole turnaround section is replaced arc to turn by some broken line smoothly transition；

One, pour at the bottom of tunnel the construction method of arch:

The cleaning of a, scar, basis are checked and accepted:

Remove the foreign material in the range of concreting, earth, loosen block and concrete spray coating, And use high pressure water flushing wash clean；The joint bar first setting Φ 25mm before end arch reinforcing bar peace system is some Root, between joint bar, array pitch is 2.0 × 1.5m, exposes 20cm；When end arch reinforcing bar binding, then may be used Utilizing this joint bar to weld with end arch reinforced frame stud, measuring goes out dotted line, welds reinforcement installation sample rack；

B, surveying setting-out:

Total powerstation is used to measure unwrapping wire, by piecemeal pile No., elevation, centreline control point line It is indicated in obvious fixed position；

C, reinforcement fabrication, transport and install:

Reinforcing bar unification, by the machine-shaping of reinforcing bar factory, is transported near working face, carry out reinforcing bar binding or Sleeve connection；

Reinforcement installation pre-test team accurately releases concrete flow-passing surface elevation, by measuring the height released Journey point is by Mian Wai two ends, storehouse 1m weldering sample rack reinforcing bar hanging wire；Hoop support muscle is Φ 25mm reinforcing bar, Spacing 1.5m；Weld Φ 25mm sample rack reinforcing bar on support muscle, along axis spacing 2m, be welded into reinforced frame； Bottom does not set the position of template, should weld a sample rack reinforcing bar yet, in case setting-out uses；Concrete steel Tendon protective layer employing arranges intensity between reinforcing bar and template and is not less than the coagulation of structure design strength Soil cushion block；Bury iron wire in cushion block underground and tighten with reinforcing bar；Cushion block should be staggered mutually, dispersed placement；

Scraping rail uses the arc of φ 12mm round steel to scrape rail, spacing 1.0～2.0m；By surveying setting-out Concrete surface design altitude be welded on scraping rail on the stud of reinforced frame；Concrete coating divides three Sequence is carried out, and cuts off and scrapes rail, cut off with mortar levelling and stay when scraping rail before carrying out the second sequence and wiping one's face Pit-hole；

Scraper plate uses Light Aluminum Alloy ruler or the lumps of wood of 3m length, and two ends are carried on a shoulder pole respectively and scraped on rail, Any excess concrete is blown off, reaches height and fill out low effect, utilize with this elevation scraping rail to control Base plate processed (below circular shape tunnel graticule) receipts face elevation；

D, model sheetinstallat:

The fixing employing φ 12mm lacing wire of template supports, φ 12mm lacing wire must with beat at rock On anchor pole (or joint bar) firmly weld, 30 ° of scope not shutterings bottom base plate, it is fixed to install Pattern frame carries out troweling shaping, and each 45 ° of scopes in base plate both sides use turn-over form construction, upset Template uses two pieces of 1.0m × 1.5m sizing arc formworks assembled, removes mould before concrete initial set Plate is wiped one's face, overmolded at twice in concreting process: turns over for the first time and tears foot two row open Template in the range of lacing wire, second time is turned over the template torn open in the range of topmost two row's lacing wire, is wiped one's face The most first cutting off lacing wire, lacing wire head submerges and fills and leads up with mortar after 5cm in concrete, two rows Template φ 32mm arc back of the body load separately blanking processing in the range of lacing wire (includes a φ in template The arc back of the body load of 32mm), turnover uses；

E, pre-embedment grouting pipe and sealing, ground connection band iron are installed:

Appraise and decide dull whole grout hole aperture according to engineering, arrange that pressing cloth hole pattern performs, and installs Want firm welding；Grout pipe installation is painted in template correspondence position after checking position inerrancy Put and perform mark, mouth of pipe cotton gauze or geotextiles closure；

Sealing piece to arrange some easy brackets when installing, and sealing piece is arranged on bracket, folder Tool is also secured on bracket, and rubber water-proof installation uses φ 6.5mm reinforcing bar to do tongs and fixes, Laying a tongs every 1～1.5m in the horizontal, rubber water-proof joint uses bonding method even Connect；

Sealing piece groove is strictly centrally located by seam face, and sealing piece is tight with template faying face；Peace The sealing piece installed is fixed and is protected；

The burial place of ground connection band iron is carried out by design requirement, and ground connection band iron to weld, Concreting protects the earth tap exposed after completing；

F, locking plug template are installed:

Locking plug template selects the plank that common punching block or 3cm are thick, is welded in storehouse on anchor pole Lacing wire and beat on the dowel on the scar of basis fixing in advance；

G, bring down stocks, check and accept:

Before casting concrete, check about pouring preparation；

H, concreting:

Concrete uses concrete pump pumping to put in storage, and poker vibrator vibrates；

First carry out logical storehouse from one end to other end when end arch concreting starts and be layered blanking also Fully vibrate, coagulation land reform when lower concrete is poured into from both sides angle mould end opening 10～20cm Concreting is carried out by both sides abutment wall blanking；Vibrate inside template and make concrete tamp both sides The bottom template of abutment wall inclined-plane template scope, the concrete that now base plate scope is unnecessary is the most artificial Being transported to both sides abutment wall blanking pour, successively stone is until parting elevation；

Concreting should be layered from low to high and carry out, and every layer thickness is 50cm, symmetrical all Even blanking, the concreting rate of climb controls at 0.5m/h；Concrete should with watering with closing a position, If produce aggregate accumulation, with manually being shoveled the position that mortar is more；Concreting Cheng Zhong, forbids to add water；

The principle of " fast inserting is pulled out slowly " is followed in vibrator operation, inserts about lower-layer concrete 5cm； Vibrator inserts the spacing of concrete and presses 1.5 times less than vibrator effective radius, away from template Distance is not less than 1/2 times of vibrator effective radius, and insertion position is quincuncial arrangement, keeps away as far as possible Exempt to touch reinforcing bar and built-in fitting, be aided with if desired and manually make closely knit, after twice discharging contact firm by ramming Place should strengthen vibrating；The vibrating time of single position is advisable with 15～30s, with concrete no longer Notable sinking, till occurring without bubble and starting bleeding；

I, overmolded, wipe one's face:

30 ° of arcuate extent of base plate, without template, organize peace during concreting to parting elevation immediately Row closes a position, wipes one's face, press polish work；It is close to scrape rail with floating rule middle without overmolded position to bottom Concrete leveling, then takes out and scrapes rail, finally carries out press polish with smearing shovel；

After concreting terminates, observe and grasp the solidification situation of concrete at any time, turn in time Mould is wiped one's face；Form removal at twice during concrete initial set；Before concrete coating, Carry out clear limit, removing mucilage, repair the work such as limit and unfilled corner；Face work is carried out at twice: The most smooth wipe one's face followed by vibrate carry out, reach height and fill out low purpose, make to rub extrusion Mortar is evenly distributed on concrete surface；Second time is wiped one's face and is and then carried out for the first time, makes Surface uniformity, makes panel meet flatness requirement；

Sufficient waterproof measure should be done before wiping one's face, and with ruler check table surface evenness；When wiping one's face Should be specifically noted that interface position, eliminate faulting of slab ends, and make it smooth；

The pre-buried grout pipe mouth of pipe should be found out when wiping one's face, and with a diameter slightly larger than grout pipe The stopper plug of diameter, on grout pipe, will be compacted floating by concrete about, treat that concrete has one When determining intensity, stopper is gently revolved taking-up, so that the concrete formation of the pre-embedment grouting pipe mouth of pipe is preferable；

Each pour is set up after model sheetinstallat terminates and is hung pin scaffold as operation platform, The pin platform that hangs set up is asked to keep 15～20cm distances from concrete surface；

J, maintenance:

Watering maintenance is proceeded by, to keep coagulation in 12～18h after concreting Soil surface often moistens, it is to avoid the generation in crack, and curing time is no less than 14 days；

Two, the construction method of tunnel side and roof arch is poured:

After end arch concrete reaches age strength, i.e. start attachment rail on end arch, carry out steel The assembling of muscle chassis and move integrally the assembling of frame；Prepare the pouring construction of side-top arch concrete； Its side-top arch concrete construction technology is as follows:

A, clear base and treatment of construction joints, flushing:

Before concreting, remove the foreign material on pneumatically placed concrete resilience ballast or basement rock, earth and Loosen rock, construction joint artificial chiseling, remove all outer skins on seam face, bulk material and pollution Body, with pressure flush of water clean after, drain ponding, keep cleaning；

B, integral movable type bearing frame are set up, surveying setting-out and steel arch-shelf are installed:

Side-top arch concrete construction uses 3.81 centimetres of steel pipes of φ to do bow member, top, limit arc formwork Supporting and assemble with four Pin Steel tubular arch-frame, steel pipe frame uses the full hall frame of integral movable type, longitudinally Array pitch is 0.6/0.9 rice, and horizontal array pitch is set up by 0.7 meter, and level course is set up away from by 0.9 meter, and Bridging to be added；Integral movable type bearing frame is set up and the supporting form of Steel tubular arch-frame；Framed bent By total powerstation measuring bow member installation site and plug pile No. after having set up, the position that bow member is installed Point is located on the integral movable type bearing frame set up；Side and roof arch rock face carries out plug The mark of pile No., locking plug template is installed according to this mark；

C, template assembly:

Side-top arch concrete template uses P1015, P3015 punching block assembled, and outside Steel tubular arch-frame is made Back of the body load, calibration template, bow member Pin spacing is 0.6/0.9 rice, and formwork reinforcement uses and support is combined storehouse The mode inside adding inner support is carried out, and two side templates use horizontal steel tube to add the form of jacking, top die Plate uses jack jacking to the mode adding steel pipe after structural plane in bottom；Each storehouse seam areas For ensureing that form joint is tight, can use in storehouse, add row's lacing wire with old concrete seam crossing, Inner supporting member in storehouse, plug mould is progressively removed along with the rising of concrete in concreting process Plate uses φ 12mm reinforcing bar to draw, in making, the mode reinforcing template combined with outer support；

D, reinforcing bar and installation of embedded parts:

Reinforcing bar and built-in fitting make in reinforcement yard, and reinforcement installation utilizes reinforcement trolley manually to tie up Pricking, with anchor pole, in order to rely on weld holder stud to fix, (position without anchor pole first sets joint bar, then welds Connecing bearing rod to fix, its method is identical with end arch joint bar with requirement)；

Rubber water-proof sheet is fixed with tongs when burying underground, and tongs is the steel using φ 6.5mm Muscle makes, and lays a tongs every 1～1.5m in the horizontal, and rubber water-proof joint uses Bonding method；Hole depth is the steel pipe of the consolidation grouting pipe employing φ 65mm of L=8m；

E, bring down stocks check and accept:

Before concreting, clear up the foreign material in position in storehouse, and rinse well, drain the water away；

F, concreting:

Concrete uses concrete pump pumping to put in storage, and poker vibrator vibrates；

Side-top arch concrete pours employing and puts in storage from crown position, the right and left hang slip bucket uniformly under Material, the discrepancy in elevation cannot be greater than 50cm, slips barrel discharging opening away from concrete surface about 1.5m, prevents bone Material separates, and manually closes a position, poker vibrator vibration compacting；Concrete slump controls Between 14～16cm, layering logical storehouse stone, receipts storehouse, top uses and moves back tube method；

G, template, bow member, steel pipe frame are removed:

After concrete reaches the demoulding strength that specification specifies, dismountable template, bow member, steel pipe frame； First removing the connecting tube in level course steel pipe during form removal, recycling bottle gouard moved by hands is by both sides steel arch-shelf Inwardly pull, make two side templates move with bow member and realize the both sides demoulding；Remove entirety the most again to move The steel pipe added bottom moving frame, rotates jack and makes movable stand slowly fall back to realization top on light rail Portion's demoulding；

Faulting of slab ends at form joint or projection are carried out polishing finishing；After bow member, form removable Find out the pre-embedment grouting pipe mouth of pipe in time, and line up is protected by；

H, maintenance:

After concreting terminates 12～18 hours, carrying out maintenance of sprinkling water, curing time is no less than 14 days.

Claims (1)

1. a construction method of edge top arch and bottom arch of concrete pouring tunnel, is characterized in that: For needing to carry out the circular cross section tunnel of concrete-liner construction, use first construction circular shape tunnel center End arch in the range of 120 ° below, rear construction side and roof arch pour order；Reinforced concrete lining Building arch at the bottom of section uses overmolded to wipe one's face construction technology, and side and roof arch uses integral movable type steel pipe scaffold The technique that configuration steel form carries out constructing；The a length of 12m of traveling centering, use two sections soft Property connect, whole turnaround section by some broken line smoothly transition replace arc turn；

One, pour the construction method of arch at the bottom of tunnel, encircle concrete pouring construction at the bottom of tunnel sequentially:

The cleaning of a, scar, basis are checked and accepted:

Remove the foreign material in the range of concreting, earth, loosen block and concrete spray coating, And use high pressure water flushing wash clean；The joint bar first setting Φ 25mm before end arch reinforcing bar peace system is some Root, between joint bar, array pitch is 2.0 × 1.5m, exposes 20cm；When end arch reinforcing bar binding, then profit Welding with end arch reinforced frame stud with this joint bar, measuring goes out dotted line, welds reinforcement installation sample rack；

B, surveying setting-out:

Total powerstation is used to measure unwrapping wire, by piecemeal pile No., elevation, centreline control point line It is indicated in obvious fixed position；

C, reinforcement fabrication and installation:

Reinforcing bar unification, by the machine-shaping of reinforcing bar factory, is transported near working face, carry out reinforcing bar binding or Sleeve connection；

Reinforcement installation pre-test team accurately releases concrete flow-passing surface elevation, by measuring the height released Journey point is by Mian Wai two ends, storehouse 1m weldering sample rack reinforcing bar hanging wire；Hoop support muscle is Φ 25mm steel Muscle, spacing 1.5m；Weld Φ 25mm sample rack reinforcing bar on support muscle, along axis spacing 2m, be welded into Reinforced frame；Bottom does not set the position of template, welds a sample rack reinforcing bar yet；Steel reinforced concrete protective layer Employing arranges intensity between reinforcing bar and template and is not less than the concrete pad of structure design strength； Bury iron wire in cushion block underground and tighten with reinforcing bar；Cushion block should be staggered mutually, dispersed placement；

Scraping rail uses the arc of φ 12mm round steel to scrape rail, spacing 1.0～2.0m；Put by measurement The concrete surface design altitude of line is welded on scraping rail on the stud of reinforced frame；Concrete coating divides Three sequences are carried out, and cut off and scrape rail, cut off with mortar levelling and stay when scraping rail before carrying out the second sequence and wiping one's face Under pit-hole；

Scraper plate uses Light Aluminum Alloy ruler or the lumps of wood of 3m length, and two ends are carried on a shoulder pole respectively and scraped on rail, Any excess concrete is blown off, utilizes with this elevation scraping rail to receive face elevation to control base plate；

D, model sheetinstallat:

The fixing employing φ 12mm lacing wire of template supports, φ 12mm lacing wire must with beat at rock Anchor pole on stone firmly welds, 30 ° of scope not shutterings bottom base plate, installs sizing sample rack Carrying out troweling shaping, each 45 ° of scopes in base plate both sides use turn-over form construction, turn-over form Use two pieces of 1.0m × 1.5m sizing arc formworks assembled, form removal before concrete initial set Wipe one's face, overmolded at twice in concreting process: turn over for the first time and tear foot two row open and draw Template in the range of muscle, second time is turned over the template torn open in the range of topmost two row's lacing wire, is wiped one's face it Front first cutting off lacing wire, lacing wire head submerges and fills and leads up with mortar after 5cm in concrete, two rows Template φ 32mm arc back of the body load separately blanking processing in the range of lacing wire, turnover uses；

E, pre-embedment grouting pipe and sealing, ground connection band iron are installed:

Appraise and decide dull whole grout hole aperture according to engineering, arrange that pressing cloth hole pattern performs, and installs Want firm welding；Grout pipe installation is painted in template correspondence position after checking position inerrancy Put and perform mark, mouth of pipe cotton gauze or geotextiles closure；

Sealing piece to arrange some easy brackets when installing, and sealing piece is arranged on bracket, folder Tool is also secured on bracket, and it is clamping that the installation of rubber water-proof sheet uses φ 6.5mm reinforcing bar to do sealing Fixed, lay a tongs every 1～1.5m in the horizontal, rubber water-proof joint uses to be pasted Mode connects；

Sealing piece groove is strictly centrally located by seam face, and sealing piece is tight with template faying face；Peace The sealing piece installed is fixed and is protected；

The burial place of ground connection band iron is carried out by design requirement, and ground connection band iron to weld, Concreting protects the earth tap exposed after completing；

F, locking plug template are installed:

Locking plug template selects common punching block or the plank of 3cm thickness, is welded to anchor pole in storehouse On lacing wire and beat on the dowel on the scar of basis fixing in advance；

G, bring down stocks, check and accept:

Before casting concrete, check about pouring preparation；

H, concreting:

Concrete uses concrete pump pumping to put in storage, and poker vibrator vibrates；

First carry out logical storehouse from one end to other end when end arch concreting starts and be layered blanking And fully vibrate, coagulation when lower concrete is poured into from both sides angle mould end opening 10～20cm Land reform is carried out concreting by both sides abutment wall blanking；Vibrate inside template and make concrete tamp The bottom template of abutment wall inclined-plane, both sides template scope, the concrete that now base plate scope is unnecessary is immediately Manually being transported to both sides abutment wall blanking pour, successively stone is until parting elevation；

Concreting should be layered from low to high and carry out, and every layer thickness is 50cm, symmetrical Uniformly blanking, the concreting rate of climb controls at 0.5m/h；Concrete should with watering with closing a position, If produce aggregate accumulation, with manually being shoveled the position that mortar is more；Concreting Cheng Zhong, forbids to add water；

The principle of " fast inserting is pulled out slowly " is followed in vibrator operation, inserts lower-layer concrete 5cm left Right；Vibrator inserts the spacing of concrete and presses 1.5 times less than vibrator effective radius, away from The distance of template is not less than 1/2 times of vibrator effective radius, and insertion position is quincuncial arrangement, Avoid touching reinforcing bar and built-in fitting as far as possible, be aided with and manually make closely knit, after twice discharging contact firm by ramming Place should strengthen vibrating；The vibrating time of single position is advisable with 15～30s, with concrete no longer Notable sinking, till occurring without bubble and starting bleeding；

I, overmolded, wipe one's face:

30 ° of arcuate extent of base plate, without template, are organized during concreting to parting elevation immediately Arrangement is closed a position, is wiped one's face, press polish work；It is close to scrape rail with floating rule middle without overmolded position to bottom Concrete leveling, then take out and scrape rail, finally carry out press polish with smearing shovel；

After concreting terminates, observe and grasp the solidification situation of concrete at any time, turn in time Mould is wiped one's face；Form removal at twice during concrete initial set；Before concrete coating, Carry out clear limit, removing mucilage, repair limit and unfilled corner work；Face work is carried out at twice: The most smooth wipe one's face followed by vibrate carry out, reach height and fill out low purpose, make to rub extrusion Mortar is evenly distributed on concrete surface；Second time is wiped one's face and is and then carried out for the first time, makes Surface uniformity, makes panel meet flatness requirement；

Sufficient waterproof measure should be done before wiping one's face, and with ruler check table surface evenness；When wiping one's face Should be specifically noted that interface position, eliminate faulting of slab ends, and make it smooth；

The pre-buried grout pipe mouth of pipe should be found out when wiping one's face, and with a diameter slightly larger than grout pipe The stopper plug of diameter, on grout pipe, will be compacted floating by concrete about, treat that concrete has one When determining intensity, stopper is gently revolved taking-up, so that the concrete formation of the pre-embedment grouting pipe mouth of pipe is preferable；

Each pour is set up after model sheetinstallat terminates and is hung pin scaffold as operation platform, The pin platform that hangs set up is asked to keep 15～20cm distances from concrete surface；

J, maintenance:

Watering maintenance is proceeded by, to keep coagulation in 12～18h after concreting Soil surface often moistens, it is to avoid the generation in crack, and curing time is no less than 14 days；

Two, the construction method of tunnel side and roof arch is poured:

After end arch concrete reaches age strength, i.e. start attachment rail on end arch, carry out steel The assembling of muscle chassis and move integrally the assembling of frame；Prepare the pouring construction of side-top arch concrete； Its side-top arch concrete construction technology is as follows:

A, clear base and treatment of construction joints, flushing:

Before concreting, remove the foreign material on pneumatically placed concrete resilience ballast or basement rock, earth and Loosen rock, construction joint artificial chiseling, remove all outer skins on seam face, bulk material and pollution Body, with pressure flush of water clean after, drain ponding, keep cleaning；

B, integral movable type bearing frame are set up, surveying setting-out and steel arch-shelf are installed:

Side-top arch concrete construction uses 3.81 centimetres of steel pipes of φ to do bow member, top, limit arc formwork Supporting and assemble with four Pin Steel tubular arch-frame, steel pipe frame uses the full hall frame of integral movable type, longitudinally Array pitch is 0.6/0.9 rice, and horizontal array pitch is set up by 0.7 meter, and level course is set up away from by 0.9 meter, And bridging to be added；Integral movable type bearing frame is set up and the supporting form of Steel tubular arch-frame；Row Frame uses total powerstation measuring bow member installation site and plug pile No. after having set up, the position that bow member is installed Put and be a little located on the integral movable type bearing frame set up；Side and roof arch rock face is carried out stifled The mark of head pile No., locking plug template is installed according to this mark；

C, template assembly:

Side-top arch concrete template uses P1015, P3015 punching block assembled, outside Steel tubular arch-frame Making back of the body load, calibration template, bow member Pin spacing is 0.6/0.9 rice, and formwork reinforcement uses support knot The mode adding inner support in closing storehouse is carried out, and two side templates use horizontal steel tube to add the form of jacking, top Portion template uses jack jacking to the mode adding steel pipe after structural plane in bottom；Each storehouse seam Position is tight for ensureing form joint, can use and add a row with old concrete seam crossing in storehouse and draw Muscle, progressively removes inner supporting member in storehouse along with the rising of concrete in concreting process, stifled Head mould plate uses φ 12mm reinforcing bar to draw, in making, the mode reinforcing template combined with outer support；

D, reinforcing bar and installation of embedded parts:

Reinforcing bar and built-in fitting make in reinforcement yard, and reinforcement installation utilizes reinforcement trolley manually to tie up Prick, with anchor pole for relying on weld holder stud to fix；

Rubber water-proof sheet is fixed with tongs when burying underground, and tongs is the steel using φ 6.5mm Muscle makes, and lays a tongs every 1～1.5m in the horizontal, and rubber water-proof joint is adopted Use bonding method；Hole depth is the steel pipe of the consolidation grouting pipe employing φ 65mm of L=8m；

E, bring down stocks check and accept:

Before concreting, clear up the foreign material in position in storehouse, and rinse well, drain the water away；

F, concreting:

Concrete uses concrete pump pumping to put in storage, and poker vibrator vibrates；

Side-top arch concrete pours employing and puts in storage from crown position, the right and left hang slip bucket uniformly under Material, the discrepancy in elevation cannot be greater than 50cm, slips barrel discharging opening away from concrete surface 1.5m, prevents aggregate from dividing From, manually close a position, poker vibrator vibration compacting；Concrete slump controls Between 14～16cm, layering logical storehouse stone, receipts storehouse, top uses and moves back tube method；

G, template, bow member, steel pipe frame are removed:

After concrete reaches the demoulding strength that specification specifies, form removal, bow member, steel pipe frame； First removing the connecting tube in level course steel pipe during form removal, recycling bottle gouard moved by hands is by both sides steel arch-shelf Inwardly pull, make two side templates move with bow member and realize the both sides demoulding；Remove entirety the most again to move The steel pipe added bottom moving frame, rotates jack and makes movable stand slowly fall back to realization top on light rail Portion's demoulding；

Faulting of slab ends at form joint or projection are carried out polishing finishing；After bow member, form removable Find out the pre-embedment grouting pipe mouth of pipe in time, and line up is protected by；

H, maintenance:

After concreting terminates 12～18 hours, carrying out maintenance of sprinkling water, curing time is no less than 14 days.