CN101818645B - Construction method for newly increasing arched open cut tunnel at railway operating line tunnel portal - Google Patents
Construction method for newly increasing arched open cut tunnel at railway operating line tunnel portal Download PDFInfo
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- CN101818645B CN101818645B CN2010101324688A CN201010132468A CN101818645B CN 101818645 B CN101818645 B CN 101818645B CN 2010101324688 A CN2010101324688 A CN 2010101324688A CN 201010132468 A CN201010132468 A CN 201010132468A CN 101818645 B CN101818645 B CN 101818645B
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Abstract
The invention relates to the field of tunnel construction, in particular to a construction method for newly increasing an arched open cut tunnel at a railway operating line tunnel portal. The construction method solves the problems that the conventional construction method for newly increasing the arched open cut tunnel at the railway operating line tunnel portal has complex process, difficult operation, low construction efficiency, large safety risk, poor construction quality and the like. The construction method comprises the following steps of: surveying setting-out, construction of manually digging hole piles, fiber concrete slab prefabrication, joist construction, processing and assembly of an H profile steel frame, short side wall construction, arch construction of the arched open cut tunnel, end-sealing concrete construction and the like. The fiber concrete slab and the profile steel frame form an integral structure, so the stability is good, and the safety is ensured; the method avoids formwork removal operation after arch concrete pouring is finished, simplifies the construction process, accelerates the construction progress, and has considerable economic benefit; the profile steel frame is uniformly processed in a processing factory and pre-assembled and hoisted on site so as to shorten the operation time and improve the construction efficiency; and the fiber concrete slab is prefabricated in the factory and then arranged on site, so the arched open cut tunnel has surface finish and attractive appearance.
Description
Technical field
The present invention relates to the constructing tunnel field, be specially a kind of job practices of newly increasing arched open cut tunnel at railway operating line tunnel portal.
Background technology
Being generally short circuit base or simple span bridge between the railway operation line tunnel group connects, top margin slope, hole is generally high slope, if high slope generation slump, tumble harm such as stone, to jeopardize the operation security of railway, for guaranteeing safety, the most effectively way is to set up arch open cut tunnel at the high slope tunnel portal, generally is divided into two kinds, that is: adopt arch open cut tunnel to connect between two holes, the arch open cut tunnel spreading is adopted at single hole.
Newly increasing arched open cut tunnel at railway operating line tunnel portal belongs to safe strengthening measure, and construction period will guarantee to run the safety of line.The elongated way that the arch open cut tunnel barrel is partly constructed is: utilize steel pipe scaffold etc. as interior support, adopt combined steel formwork or plank as internal mold, assembling reinforcement, install and reinforce exterior sheathing, fluid concrete then, treat that concrete reaches prescribed strength after, remove support system and internal mold.Produce following problem thus: 1. in arch open cut tunnel headroom scope, set up the steel pipe scaffold support system and combined steel formwork or wooden form internal mold are installed, events in operation in the railway operation line have been increased, must full safety requirements, complex process, operating difficulties, efficiency of construction are low; 2. medium and small rod member of steel pipe scaffold support system and fastener etc., potential safety hazard very easily takes place in the phenomenon of easily falling under train operation and the electric situation of contact net tape, have bigger security risk; 3. after the arch concrete pouring is finished, must carry out striking job, for the worker's point that adopts arch open cut tunnel to connect between two holes, the steel pipe scaffold of dismounting and template etc. must be had bad luck the other end recession in tunnel from the construction plant, and efficiency of construction reduces greatly; 4. adopt combined steel formwork or wooden form as internal mold cast arch concrete, if phenomenons such as spillage, local race mould take place between the template seam, will there be defective in the concrete apparent mass after the form removal, and general effect is relatively poor.
Summary of the invention
The present invention provides a kind of job practices of newly increasing arched open cut tunnel at railway operating line tunnel portal for the job practices that solves existing hole, railway operation threaded list road and set up open cut tunnel exists complex process, operating difficulties, efficiency of construction is low, security risk is big and problem such as construction quality difference.
The present invention adopts following technical scheme to realize: a kind of job practices of newly increasing arched open cut tunnel at railway operating line tunnel portal may further comprise the steps:
A, measurement setting-out
Measure setting-out before the construction earlier, the center mileage and the axial location of stake position and arch open cut tunnel are checked, measure the original ground absolute altitude, determine the bore position and the degree of depth;
B, manual digging pile construction
C, fiber concrete slab are prefabricated
The employing batch production is prefabricated, customization plastic square module, and the vibroplatform vibration compacting, the fiber concrete slab of making has the strip bolt hole on four angles;
D, joist construction
After pile foundation construction is finished, cleaning pile foundation surface, colligation joist reinforcing bar is with pile foundation reinforcing bar and joist reinforcing bar binding, firm welding; After the joist reinforcing bar binding is finished, profile steel frame pre-embedded bolt and pre-embedded steel slab are installed; Adopt the steel form formwork erection; Build the joist concrete;
E, the processing of H profile steel frame and installation
A, the processing of H profile steel frame: the H profile steel frame adopts the clod wash technology to be spliced by multistage H shaped steel, have on the H profile steel frame inboard wing listrium with fiber concrete slab on the corresponding strip bolt hole in strip bolt hole position, wherein the strip bolt hole direction on the fiber concrete slab is a horizontal direction, the punching direction is a vertical direction on the H profile steel frame inboard wing listrium, and H profile steel frame bottom is fixed with the connection steel plate;
B, H profile steel frame are installed: the H profile steel frame is 60cm along the design pitch of open cut tunnel longitudinal centre line, each H profile steel frame vertically connects the employing angle steel, mode of connection is a bolt, piece between the adjacent H profile steel frame staggers mutually, short abutment wall upstanding portion adopts bolt and welding to strengthen mode of connection, and vault partly adopts bolt; Utilize high-strength bolt to link between the connection steel plate of adjacent H profile steel frame bottom, connect the welding of steel plate periphery, after the H profile steel frame was in place, the pre-embedded steel slab in the joist was connected the steel plate periphery and adopts welding to strengthen with the H profile steel frame; In blocking point, utilize crane to cooperate artificial lifting H profile steel frame;
It is edge-on that wherein a Pin H profile steel frame is faced upward the slope from keeping to the side, adopt diagonal brace to reinforce with the tunnel double-lining concrete, diagonal brace is spaced apart along H profile steel frame hoop direction, the anchored end of diagonal brace adopts punching in advance on the tunnel double-lining concrete, insert the reinforcing bar anchoring, as the strong point of a Pin H profile steel frame bracing element, laterally adopt angle steel to connect between adjacent two reinforcing bars;
F, the construction of short abutment wall
After the installation of H profile steel frame, carry out short abutment wall construction, adopt fiber concrete slab, be installed in the H profile steel frame bottom wing listrium, link by bolt and H profile steel frame by the line side internal mold; The short abutment wall reinforcing bar of colligation, dowel is laid simultaneously between joist and the short abutment wall; External mold adopts wooden form or combined steel formwork formwork erection; Pour into a mould short side wall concrete;
G, the construction of arch open cut tunnel arch
A, arch internal mold install: from H profile steel frame bilateral symmetry fiber concrete slab is installed, mounting method is that the corresponding strip bolt hole in position on fiber concrete slab and the H profile steel frame inboard wing listrium is connected by bolt; Slit between the adjacent fiber concrete slab, between fiber concrete slab and the H profile steel frame is with the filling of engineering double faced adhesive tape, adopt the shutoff of senior atom ash closely knit to slit between the fiber concrete slab one by one then, the slit is closely knit with geotextiles filling shutoff between fiber concrete slab and the H profile steel frame;
B, arch reinforcement installation: the arch reinforcing bar is made of the two-layer steel mesh reinforcement in inside and outside, and connecting reinforcement is established in the centre, and connecting reinforcement and fiber concrete slab handle reinforcing bar binding are firm;
C, arch external mold are installed and reinforced: external mold adopts wooden form, by being welded on the bar dowel support fixation on the H profile steel frame;
D, arch retaining head mould is installed: the retaining head mould adopts steel plate, with H profile steel frame ala lateralis listrium firm welding, and with reinforcing bar and adjacent H profile steel frame by being weldingly connected, become integral body with the arch concrete pouring;
E, concrete pouring: pour into a mould at twice, and, build to the haunch position for the first time, after concrete strength reaches 5MPa, carry out the concrete pouring second time again from the cast of arch bilateral symmetry;
F, dismounting external mold;
F, end-blocking concrete construction
Adopt and the concrete shutoff of arch with label in the slit that arch open cut tunnel keeps to the side to face upward between sloping side and the original two lining concrete.
Compare with conventional construction method, H profile steel frame, fiber concrete slab internal mold system are adopted in the concrete construction of arch open cut tunnel of the present invention arch, and its main technique is: the H profile steel frame is in the unified processing of processing factory, and fiber concrete slab adopts batch production prefabricated; In blocking point, utilize crane to cooperate artificial lifting H shaped steel, then at H shaped steel inboard wing listrium installed inside fiber concrete slab, link firmly by bolt between fiber concrete slab and the H shaped steel frange plate; Under the protection of H shaped steel, fiber concrete slab internal mold system, carry out the arch reinforcing bar binding, external mold is installed and reinforce, keep off head mould installation, cast arch concrete etc.; H profile steel frame, fiber concrete slab become integral body as permanent structure and arch concrete pouring, and H shaped steel inboard wing listrium exposed parts is carried out antirust processing.
Mainly there is following advantage in this technology: 1. fiber concrete slab is installed as internal mold in profile steel frame inboard wing listrium, fiber concrete slab and profile steel frame form overall structure, good stability.Under the protection of internal mold system, carry out arch reinforcing bar and Concrete Construction, avoided operation in railway operation line, guaranteed safety; 2. profile steel frame and fiber concrete slab become integral body as permanent structure and arch concrete pouring, striking job after having avoided the arch concrete pouring to finish, simplified working procedure, accelerated construction speed, saved arch concrete construction inner side template and support expense simultaneously, economic benefit is considerable; 3. profile steel frame is in the unified processing of processing factory, and pre-assembly unit is carried out at the scene, utilizes crane to lift, manually cooperate and be in place in blocking point, has effectively shortened the activity duration in the point, has improved efficiency of construction; 4. fiber concrete slab carries out installing at the scene after prefabricated in factory, any surface finish, attractive in appearance, and general effect is good.
Description of drawings
Fig. 1 is the structural representation of fiber concrete slab calibrated bolck;
Fig. 2 is the structural representation of the special-shaped piece of fibrous concrete plate connector;
Fig. 3 is the structural representation of H profile steel frame;
Fig. 4 is the reinforcing schematic diagram of a Pin H profile steel frame;
Fig. 5 is the reinforcing position enlarged drawing between a Pin H profile steel frame and the lining cutting among Fig. 4;
Fig. 6 is an arch reinforcing bar binding schematic diagram
Fig. 7 is retaining head mould plate scheme of installation;
Fig. 8 is retaining head mould plate distribution map;
Among the figure: the 1-fiber concrete slab; 2-strip bolt hole; The 3-joist; The 4-H profile steel frame; 5-tunnel double-lining concrete; The 6-diagonal brace; The 7-reinforcing bar; The 8-angle steel; The short abutment wall of 9-; 10-keeps off head mould; 11-H profile steel frame ala lateralis listrium; 12-H profile steel frame inboard wing listrium; The outer longitudinal reinforcement of 13-; The outer circumferential reinforcement of 14-; 15-internal layer longitudinal reinforcement; 16-internal layer circumferential reinforcement; The 17-piece.
The specific embodiment
The job practices of the newly-increased arch open cut tunnel in a kind of railway operation threaded list road may further comprise the steps:
A, measurement setting-out
Measure setting-out before the construction earlier, the center mileage and the axial location of stake position and arch open cut tunnel are checked, measure the original ground absolute altitude, determine the bore position and the degree of depth;
B, manual digging pile construction
A. technological process
Stake hole measurement location → aperture shoveling → steel reinforced concrete fore shaft → pile body cut the earth → build breast wall concrete → cyclic advance reach projected depth → reinforcing cage and manufacture and install → pile concrete builds → concrete curing.
For guaranteeing the static achievement of checking and accepting, during the excavation pile construction, carry out settlement observation to rail on the circuit.
B. job practices
After the hole pile positioning is finished, directly emit the excavation outline line according to stake, apply the fore shaft concrete, fore shaft thickness is 0.5 meter, and the degree of depth is 2 meters, fore shaft surface 0.5m above ground level, after applying and finish, fore shaft can carry out the first segment excavation, breast wall concrete is the C20 concrete, and vertical reinforcement is Φ 8, spacing 250mm in the retaining wall, and horizontal reinforcement is that Φ 12, spacing are 200mm.Will directly check stake after the first segment retaining wall is finished, stake heart location cross is guided on the retaining wall, hole pile driving construction numbering and relevant parameter are also write on the retaining wall.After first segment aperture retaining wall is finished, begin the excavation of next joint pile body, every group 3 people, 1 people is excavated in the down-hole, well face operation hoist engine 1 people, muck haulage rock ballast and retaining wall material 1 people, pile body is cut the earth by manually from top to bottom, successively carry out, meet hard soil layer, enter the high wind layer and carry out excavation operation with the air compressor machine pneumatic pick later on the fragmentation of hammer pricker with the pick spade, dig periphery after digging the centre earlier, after dregs uses 0.5 ton of hoist engine to rise to well head in the stake hole, pour trolley into, by manually transporting to assigned address, a small amount of ponding hangs out with earth in the well, when water percolating capacity was big in the well, one side was dug sump earlier in the shaft bottom, extracts out with water pump.
The earthwork of every joint pile body should be carried out panelling construction after digging and proofreading and correct immediately, and the retaining wall internal mold adopts combined steel formwork, and with U type card connection, the every joint of dado template is proofreaied and correct once, proofreaies and correct once more from aperture cross control centre and hangs vertical line inspection.Breast wall concrete adopts mixer to stir, and carries out in strict accordance with match ratio.Excavation pile construction, more than every cyclic advance 1.0m, every cyclic advance was 0.5m when water was arranged when anhydrous; When running into sand bed, the oblique reinforcing bar of squeezing into of elder generation before the excavation at inboard filling filler, is poured into a mould breast wall concrete then again, guarantees safety.Work as rich groundwater, in the time of can't carrying out the manually digging hole construction, adopt well-points dewatering, and then carry out excavation pile construction.
The reinforcing cage reinforcing bar is transported to the job site in the unified processing of processing factory, and reinforcing cage carries out colligation, installation in hole digging pile, carries out concrete cast again after meeting design and test standard requirement on inspection.
C, fiber concrete slab 1 are prefabricated
The employing batch production is prefabricated, customization plastic square module, and the vibroplatform vibration compacting, the fiber concrete slab of making has strip bolt hole 2 on four angles; As shown in Figure 1, 2, fiber concrete slab is of a size of 51 * 30cm, and thickness is 6cm, and by reinforced mesh in the designing requirement colligation fiber concrete slab, handle reinforcing bar and reinforced mesh colligation are firm, leave concentratedly earlier; Adopt blending station to mix the system fibrous concrete, treat concrete transport put in place after, earlier the plastic square module is put into vibroplatform, put reinforced mesh again, add concrete then, open the vibroplatform vibration, and constantly replenish concrete, wipe concrete surface off; Be transported to the maintenance place with flat car and carry out curing in the mold, the curing in the mold time, the maintenance environment temperature required more than 10 ℃ generally more than 24 hours, when concrete strength reaches 5MPa can the demoulding when above; Utilize flat car to be transported to the storage place after the demoulding, can be transported to the job site later, carry out the installation of fiber concrete slab when intensity reaches 70% of design strength.It is the bolt hole of Φ 20 that four jiaos of designs of fiber concrete slab have diameter, and with H profile steel frame bolt, easy for installation for making, bolt hole is processed into strip;
D, joist 3 constructions
After pile foundation construction is finished, cleaning pile foundation surface, colligation joist reinforcing bar is with pile foundation reinforcing bar and joist reinforcing bar binding, firm welding; After the joist reinforcing bar binding is finished, profile steel frame pre-embedded bolt and pre-embedded steel slab are installed, earlier single pre-embedded steel slab and bolt spot welding are fixed, pitch of bolts, expose the size conforms designing requirement, the pre-embedded steel slab welding is fixing with two longitudinal reinforcements then according to design pitch, according to design attitude pre-embedded steel slab is in place, pre-embedded steel slab and joist reinforcing bar should be separated, install and fix separately, the fine motion owing to the joist reinforcing bar causes pre-embedded steel slab generation warpage or displacement in the concrete placement to avoid, and in time checks the position of pre-embedded steel slab in the concrete placement, if warpage or displacement take place, in time adjust, until adhering to specification; Adopt the steel form formwork erection, establish Φ 12 lacing wires to drawing, on inspection, formwork reinforcement is firm, after the size conforms designing requirement, build the joist concrete;
E, 4 processing of H profile steel frame and installation
A, the processing of H profile steel frame: as shown in Figure 3, the H profile steel frame adopts the clod wash technology to be spliced by multistage H shaped steel, have on the H profile steel frame inboard wing listrium 13 with fiber concrete slab on the corresponding strip bolt hole in strip bolt hole position, wherein the strip bolt hole direction on the fiber concrete slab is a horizontal direction, the punching direction is a vertical direction on the H profile steel frame inboard wing listrium, and H profile steel frame bottom is fixed with the connection steel plate; Every section H profile steel frame specification is a H25 shaped steel, and highly for 250mm, frange plate width are 250mm, the strip diameter of bolt hole is Φ 20, and is easy for installation for making, and bolt hole is processed into strip;
The H profile steel frame adopts cold roll forming, and workpiece at first to shaped steel macroscopic examination, requires straight zero defect in buckling, and strict control forming mill roof pressure speed guarantees dimensional accuracy in the operation, guarantee behind the Workpiece shaping indeformable, non-warping, if distortion is scrapped on the spot; Be connected by bolt between H profile steel frame and the fiber concrete slab, punch in H profile steel frame inboard wing listrium position, easy for installation for making, the punching pattern is a strip, the punching before at first examining workpieces whether twist, be out of shape, guarantee drilling precision, one every dozen conscientious inspection eye in hole whether meet the requirements H profile steel frame unit be connected steel plate and must weld by drawing, can not misplace; The welding of H profile steel frame must not have dry joint, and face of weld must not have defectives such as crackle, overlap, removes the foreign material of weld seam earlier, and downhand welding is taked in welding, has welded the back slagging-off, as the repair welding at once of the not full situation of slag inclusion, pore, weld seam occurs, reaches industry standard; H profile steel frame exposed face with angle frosted turbine polishing welding slag, with the steel wire lump rust cleaning, carries out the first road priming paint rustproof paint and sprays paint again earlier according to code requirement brushing or rust prevention by applying liquid material lacquer after having removed, spray the twice finish paint after the drying again.For guaranteeing the machining accuracy of profile steel frame, after every batch of steelframe machines, must inspect pre-assembly by random samples in processing factory, being transported to on-the-spot steelframe must adhere to specification, guarantee that once mounting puts in place, peripheral assembly unit allowable error is ± 3cm that plane warping is less than 2cm;
B, H profile steel frame are installed:
Contact net must have a power failure when the H profile steel frame was installed, and included the skylight construction in, guaranteed safety, adopted crane lifting, and artificial the cooperation installs; Profile steel frame should shift to an earlier date pre-assembly or part is pre-pieces together, assembly unit progress when accelerating lifting, and on-site consolidation will have rich amount, under the situation that the place allows, many Pin of assembly unit simultaneously bow member; The place has in limited time, can be in advance middle two joint assembly units be deposited after good at the scene, so that save time during assembly unit in blocking point, guarantees to block an interior lifting progress.All material that profile steel frame is installed and component and fitting as: stone bolt, bolt and nut, connection band steel and angle steel etc. put in place in advance, and hand over special messenger's keeping;
By designing requirement, contact net is fixed by the anchor ring that is installed on the profile steel frame in the arch open cut tunnel, and anchor ring must be in place before installation, punches on profile steel frame inboard wing listrium, confirms back installation anchor ring by the back specialty of standing; Reserve the profile steel frame of contact net anchor ring installing hole and carry out mark in advance, put in place, avoid taking place inconsistent phenomenon according to the design attitude lifting;
The H profile steel frame is 60cm along the design pitch of open cut tunnel longitudinal centre line, and each H profile steel frame vertically connects employing 63mm angle steel, and mode of connection is a bolt, piece 17 between the adjacent H profile steel frame staggers mutually, avoid the steelframe piece on same cross section, in order to stressed, short abutment wall upstanding portion adopts bolt and welding to strengthen mode of connection, vault partly adopts bolt, avoid welding in principle, in order to avoid welding slag burn contact netting twine, in the time of must welding, must properly protect to the contact net line, meet the standard of zero tolerance; Utilize Φ 27 high-strength bolts to link between the connection steel plate of adjacent H profile steel frame bottom, connect the welding of steel plate periphery, after the H profile steel frame was in place, the pre-embedded steel slab in the joist was connected the steel plate periphery and adopts welding to strengthen with the H profile steel frame, to guarantee resistance to overturning.In the profile steel frame installation process, ground connection is set on profile steel frame, to guarantee safety; In blocking point, utilize crane to cooperate artificial lifting H profile steel frame;
Shown in Fig. 4,5, wherein a Pin H profile steel frame 4 is faced upward sloping edge-on from keeping to the side, adopt diagonal brace 6 to reinforce with tunnel double-lining concrete 5, diagonal brace 6 is spaced apart along H profile steel frame hoop direction, diagonal brace adopts 12.5 i iron, and the anchored end of diagonal brace adopts punching in advance on the tunnel double-lining concrete, inserts reinforcing bar 7 anchorings, as the strong point of a Pin H profile steel frame bracing element, laterally adopt angle steel 8 to connect between adjacent two reinforcing bars;
F, 9 constructions of short abutment wall
After the installation of H profile steel frame, carry out short abutment wall construction, adopt fiber concrete slab, be installed in the H profile steel frame bottom wing listrium, link by bolt and H profile steel frame by the line side internal mold; The short abutment wall reinforcing bar of colligation, dowel is laid simultaneously between joist and the short abutment wall; External mold adopts wooden form or combined steel formwork formwork erection, utilizes 15 * 15cm lumps of wood to prop up pad, establishes Φ 14 lacing wires to drawing, and on inspection, formwork reinforcement is firm, after the size conforms designing requirement, pour into a mould short side wall concrete;
G, the construction of arch open cut tunnel arch
A, arch internal mold (fiber concrete slab) install: from H profile steel frame bilateral symmetry fiber concrete slab is installed, mounting method is that the corresponding strip bolt hole in position on fiber concrete slab and the H profile steel frame inboard wing listrium 12 is connected by bolt; Slit between the adjacent fiber concrete slab, between fiber concrete slab and the H profile steel frame is with the filling of engineering double faced adhesive tape, adopt the shutoff of senior atom ash closely knit to slit between the fiber concrete slab one by one then, the slit is closely knit with geotextiles filling shutoff between fiber concrete slab and the H profile steel frame; The nut of bolt is in the inboard during installation, be cast in the arch open cut tunnel concrete, each fiber concrete slab should guarantee as far as possible that 4 bolts all are in place, under the hard situation, must guarantee 2 corner bolt is in place, answer the epipodium labour, after profile steel frame is mounted to about vertical 5m, but the installation of arranged fiber concrete slab is to save time.
Owing to adopt fiber concrete slab as internal mold, then between plate and the plate, certainly existing the slit between plate and the H profile steel frame, in order to prevent these gap leakage slurries, must do the antiseep treatment measures, in the installation process, clog with the engineering double faced adhesive tape between the fiber concrete slab and between fiber concrete slab and the profile steel frame, adopt the shutoff of senior atom ash closely knit to slit between the fiber concrete slab one by one then, the space is closely knit with geotextiles filling shutoff between fiber concrete slab and the profile steel frame.After the fibrous concrete installation, one by one installation quality and sealing situation are checked, can be carried out the arch laid reinforcement binding after meeting the requirements by quality inspection personnel;
B, arch reinforcement installation: as shown in Figure 6, the arch reinforcing bar is made of the two-layer steel mesh reinforcement in inside and outside, and connecting reinforcement is established in the centre, and connecting reinforcement and fiber concrete slab handle reinforcing bar binding are firm;
The outer reinforcement net constitutes: outer longitudinal reinforcement 13 is Φ 14, spacing 250mm, and outer circumferential reinforcement 14 is Φ 22, spacing 200mm; The internal layer steel mesh reinforcement constitutes: internal layer longitudinal reinforcement 15 is Φ 14, spacing 250mm, being close to H profile steel frame outer rim arranges, and with shaped steel reinforcing bar firm welding, have internal layer circumferential reinforcement 16 to be Φ 14, spacing 200mm in the 130 ° of scopes in internal layer arch, firm with fiber concrete slab handle reinforcing bar binding;
Because arch open cut tunnel arch steel is positioned at the circuit top, for guaranteeing safety, reinforcing bar all adopts colligation to link, and forbids adopting welding in principle.For security consideration, arch open cut tunnel hoop master muscle will connect, and draws reinforcing bar, surveys through the scene and establishes, and when resistance during greater than 10 ohm, connects earthing pole and draws static.
C, the arch external mold is installed and reinforced: external mold adopts wooden form, template thickness is 5cm, width is 30cm, the requirement template surface is smooth, and the easy accessibility seam is tight, spillage not, external mold is by being welded on the bar dowel support fixation on the H profile steel frame, the external mold outer ring is to bundling with Φ 22 reinforcing bars, Φ 22 reinforcing bars and the Φ 10 lacing wire firm welding that are welded on the H profile steel frame, for guaranteeing that template is firm in the concrete placement, do not run mould, vertically establish steel pipe to drawing reinforcement, vertically steel pipe is fixed by Φ 14 lacing wires that are welded on the H profile steel frame, and and hoop Φ 22 reinforcing bars between closely connected, external mold is reserved elongated concrete feeding mouth every about two meters, being used for concrete pan feeding and vibrating head vibrates, can behind the external mold installation forming, hoop Φ 22 reinforcing bars be cut off, extract wooden form out, concrete pouring is in time closed mould to feeding mouth, and firm with the bar dowel repair welding;
D, arch retaining head mould 10 are installed: shown in Fig. 7,8, the retaining head mould adopts steel plate, with H profile steel frame ala lateralis listrium 11 firm welding, and with reinforcing bar and adjacent H profile steel frame by being weldingly connected, become integral body with the arch concrete pouring, retaining head mould steel plate exposed parts is carried out antirust processing;
E, concrete pouring: for guaranteeing profile steel frame and internal mold monolithic stability, the concreting of arch open cut tunnel arch is poured into a mould at twice, and from the bilateral symmetry cast, build to the haunch position for the first time, after concrete strength reaches 5MPa, carry out the concrete pouring second time again;
Concrete is transported to the scene of building from mixing station by concrete tank, and automotive pump is pumped into assigned address, reserves the feeding mouth pan feeding from external mold, and the plug-in type vibrating head vibrates, and must guarantee all to vibrate between each profile steel frame, prevents to touch template, reinforcing bar when vibrating.Pouring concrete construction must adhere to that bilateral symmetry carries out, and exterior sheathing prevents quick-fried mould.Concreting finishes, and the back is in time strengthened being incubated, moisture-keeping maintaining, delays rate of temperature fall, strengthens temperature monitoring and management in the construction, in time adjusts the maintenance measure.
F, dismounting external mold: concreting is finished, and stripping when concrete reaches form removal intensity is by the time firmly stopped to use the sharp weapon form removal, in order to avoid concrete surface is caused cut; Do waterproofing work by designing requirement after the form removal, brushing both sides polymer water proofing asphalt coating;
H, end-blocking concrete construction
Arch open cut tunnel keeps to the side to face upward between sloping side and the original two lining concrete and exists the space, must shutoff.Blocking concrete employing and arch are with the label concrete, and concrete thickness is 50cm, and diameter of phi 22 reinforced mesh are established in the centre, and spacing 25cm punches on two lining concrete, and hole depth 30cm inserts Φ 22 reinforcing bars, adopts the anchoring of M30 mortar.Two lining concrete surfaces should be cut a hole hair, to guarantee and the concrete effect that is connected of end-blocking.
The blocking concrete internal mold adopts the 10mm steel plate, and with Pin profile steel frame welding, the centre is established worker's 12.5 channel-section steels and strengthened.External mold adopts wooden form, utilizes Φ 14 lacing wires and diagonal brace to reinforce.For guaranteeing the whole firm of template, the end-blocking concrete is poured into a mould at twice, is poured into the haunch position for the first time, after concrete strength reaches 5MPa, carries out the cast of residual concrete again.
The transition of I contact net
Contact net adopts the anchor cable transition, has the hole of the brim of a hat to be fixed on the brim of a hat, and the hole of the no the brim of a hat is fixed on the side slope anchor pole, and anchor cable requires to bear the uplift resistance of 5T; Contact net adopts the back that pattern is installed in the arch open cut tunnel, and anchor ring is installed in perforate on profile steel frame, treat that the arch concrete reaches design strength after, be forwarded on the profile steel frame anchor ring, from the transition anchor cable as permanent structure.
Arch open cut tunnel construction quality examination criteria is as follows:
1, manual digging pile construction allowable variation: stake footpath deviation ± 50mm, verticality allowable variation 0.3%, stake position allowable variation 50mm.
2, joist and short abutment wall allowable variation: template is installed allowable dimension variation ± 5mm, reinforcement installation dimensional errors ± 10mm, concrete surface planeness allowable variation ± 5mm.
3, profile steel frame is installed allowable variation: steelframe spacing ± 10mm, lateral attitude ± 10mm, arch elevation+20,0mm, verticality ± 2 °.
4, arch concrete allowable variation: abutment wall plan-position ± 10mm, arch elevation+30,0mm, abutment wall, arch surface finish 15mm.
Job practices of the present invention is verified on a plurality of work items, has obtained good effect, and the present invention only enumerates following case history and describes:
The ZXZQ03 bid section that second project management department of the middle iron Zheng Xi of 12 innings of groups railway passenger dedicated line project headquarter is responsible for constructing is based on the bridge tunnel, most of tunnel face is a high slope, when being about to carry out combined test, for guaranteeing safety, decision after Ministry of Railways evaluating center, Zheng Xi company, consulting, designing unit's on-the-spot meeting are surveyed, arch open cut tunnel is set up at 9 of totally 7 tunnels holes.Requirement according to the leader of the Ministry of Railways, newly-increased arch open cut tunnel construction must be completed before Zheng Xi formally opens operation completely, scheduled completion date is on January 31st, 2010, construction organization design and security protection scheme are formally passed through examination on October 21st, 2009, duration is tight, security risk is big, H profile steel frame of the present invention, fiber concrete slab internal mold system have been adopted in the construction, the arch open cut tunnel construction progress is comparatively smooth, on January 9th, 2010, the whole casting completes of arch open cut tunnel arch concrete, than 22 days in advance predetermined duration, be subjected to praising highly of each side.
Claims (1)
1. the job practices of a newly increasing arched open cut tunnel at railway operating line tunnel portal is characterized in that may further comprise the steps:
A, measurement setting-out
Measure setting-out before the construction earlier, the center mileage and the axial location of stake position and arch open cut tunnel are checked, measure the original ground absolute altitude, determine the bore position and the degree of depth;
B, manual digging pile construction
C, fiber concrete slab (1) are prefabricated
The employing batch production is prefabricated, customization plastic square module, and the vibroplatform vibration compacting, the fiber concrete slab of making has strip bolt hole (2) on four angles;
D, joist (3) construction
After pile foundation construction is finished, cleaning pile foundation surface, colligation joist reinforcing bar is with pile foundation reinforcing bar and joist reinforcing bar binding, firm welding; After the joist reinforcing bar binding is finished, profile steel frame pre-embedded bolt and pre-embedded steel slab are installed; Adopt the steel form formwork erection; Build the joist concrete;
E, H profile steel frame (4) processing and installation
A, the processing of H profile steel frame: the H profile steel frame adopts the clod wash technology to be spliced by multistage H shaped steel, have on the H profile steel frame inboard wing listrium (12) with fiber concrete slab on the corresponding strip bolt hole in strip bolt hole position, wherein the strip bolt hole direction on the fiber concrete slab is a horizontal direction, the punching direction is a vertical direction on the H profile steel frame inboard wing listrium, and H profile steel frame bottom is fixed with the connection steel plate;
B, H profile steel frame are installed: the H profile steel frame is 60cm along the design pitch of open cut tunnel longitudinal centre line, each H profile steel frame vertically connects the employing angle steel, mode of connection is a bolt, piece (17) between the adjacent H profile steel frame staggers mutually, short abutment wall upstanding portion adopts bolt and welding to strengthen mode of connection, and vault partly adopts bolt; Utilize high-strength bolt to link between the connection steel plate of adjacent H profile steel frame bottom, connect the welding of steel plate periphery, after the H profile steel frame was in place, the pre-embedded steel slab in the joist was connected the steel plate periphery and adopts welding to strengthen with the H profile steel frame; In blocking point, utilize crane to cooperate artificial lifting H profile steel frame;
It is edge-on that wherein a Pin H profile steel frame (4) is faced upward the slope from keeping to the side, adopt diagonal brace (6) to reinforce with tunnel double-lining concrete (5), diagonal brace (6) is spaced apart along H profile steel frame hoop direction, the anchored end of diagonal brace adopts punching in advance on the tunnel double-lining concrete, insert reinforcing bar (7) anchoring, as the strong point of a Pin H profile steel frame bracing element, laterally adopt angle steel (8) to connect between adjacent two reinforcing bars;
F, short abutment wall (9) construction
After the installation of H profile steel frame, carry out short abutment wall construction, adopt fiber concrete slab, be installed in the H profile steel frame bottom wing listrium, link by bolt and H profile steel frame by the line side internal mold; The short abutment wall reinforcing bar of colligation, dowel is laid simultaneously between joist and the short abutment wall; External mold adopts wooden form or combined steel formwork formwork erection; Pour into a mould short side wall concrete;
G, the construction of arch open cut tunnel arch
A, arch internal mold are installed: from H profile steel frame bilateral symmetry fiber concrete slab is installed, mounting method is fiber concrete slab and H profile steel frame inboard wing listrium (12) to be gone up the corresponding strip bolt hole in position be connected by bolt; Slit between the adjacent fiber concrete slab, between fiber concrete slab and the H profile steel frame is with the filling of engineering double faced adhesive tape, adopt the shutoff of senior atom ash closely knit to slit between the fiber concrete slab one by one then, the slit is closely knit with geotextiles filling shutoff between fiber concrete slab and the H profile steel frame;
B, arch reinforcement installation: the arch reinforcing bar is made of the two-layer steel mesh reinforcement in inside and outside, and connecting reinforcement is established in the centre, and connecting reinforcement and fiber concrete slab handle reinforcing bar binding are firm;
C, arch external mold are installed and reinforced: external mold adopts wooden form, by being welded on the bar dowel support fixation on the H profile steel frame;
D, arch retaining head mould (10) is installed: the retaining head mould adopts steel plate, with H profile steel frame ala lateralis listrium (11) firm welding, and with reinforcing bar and adjacent H profile steel frame by being weldingly connected, become integral body with the arch concrete pouring;
E, concrete pouring: pour into a mould at twice, and, build to the haunch position for the first time, after concrete strength reaches 5MPa, carry out the concrete pouring second time again from the bilateral symmetry cast;
F, dismounting external mold;
H, end-blocking concrete construction
Adopt and the concrete shutoff of arch with label in the slit that arch open cut tunnel keeps to the side to face upward between sloping side and the original two lining concrete.
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| CN101806220A (en) * | 2010-03-25 | 2010-08-18 | 中铁二院工程集团有限责任公司 | Structure extending open tunnel for existing rapid transit railway tunnel |
| CN102767378B (en) * | 2012-05-30 | 2014-04-09 | 中铁四局集团有限公司 | Double-column type tunnel portal method for bent frame construction tunnel |
| CN102996142B (en) * | 2012-12-25 | 2014-12-10 | 中鼎国际工程有限责任公司 | Construction method of mine tunnel supporting structure with fixed hanging rings |
| CN106593466B (en) * | 2017-01-19 | 2019-11-19 | 兰州交通大学 | A method of reinforcing the rhegma lining cutting of Existing Railway Line tunnel |
| CN108005660A (en) * | 2017-11-16 | 2018-05-08 | 党文华 | A kind of Optimization of Expressway Tunnel Construction method |
| CN110306451A (en) * | 2019-07-30 | 2019-10-08 | 中交路桥建设有限公司 | Face upward the setting method and set arch structure of slope protective net |
| CN110409799B (en) * | 2019-08-01 | 2021-07-13 | 中国建筑第八工程局有限公司 | Wind tunnel fair-faced concrete construction process |
| JP2021092049A (en) * | 2019-12-09 | 2021-06-17 | テクノプロ株式会社 | Form for arch structures and construction methods for arch structures |
| CN111764941B (en) * | 2020-03-27 | 2021-09-03 | 同济大学 | Tunnel prefabricated steel arch frame reinforcing method |
| CN113374510B (en) * | 2021-07-29 | 2023-12-01 | 中铁隧道集团一处有限公司 | Construction method for controlling stability of vertical formwork of reinforcement cage of cast-in-situ lining side wall of tunnel |
| CN113550765B (en) * | 2021-07-29 | 2023-12-12 | 中铁隧道集团一处有限公司 | Construction method for preventing high cantilever tunnel side wall lining reinforcement cage from inward tilting by using section steel |
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| CN101182773A (en) * | 2007-12-20 | 2008-05-21 | 中铁十二局集团有限公司 | Railway large-bore tunnel oval-shaped table-board cap brim bias-cutting type hole-door construction method |
| CN101260806A (en) * | 2008-04-24 | 2008-09-10 | 重庆交通科研设计院 | Preposition type opening construction method |
| JP2010053574A (en) * | 2008-08-27 | 2010-03-11 | Kajima Corp | Construction method for tunnel entrance |
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