CN104060629B - The superimposed wall construction method in covered back-digging subway station and portable side wall formwork jumbo - Google Patents
The superimposed wall construction method in covered back-digging subway station and portable side wall formwork jumbo Download PDFInfo
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- CN104060629B CN104060629B CN201410311428.8A CN201410311428A CN104060629B CN 104060629 B CN104060629 B CN 104060629B CN 201410311428 A CN201410311428 A CN 201410311428A CN 104060629 B CN104060629 B CN 104060629B
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Abstract
The invention discloses the superimposed wall construction method in a kind of covered back-digging subway station and portable side wall formwork jumbo, this construction method mainly comprises the following steps: S1: construction of diaphragm wall; S2: side wall construction: S3 below top board and top board: side wall construction: S4 below side wall, middle plate above middle plate and middle plate: B1 interlude side wall is constructed: S5: first phase construction of bottom plates: S6: two layers, underground interlude side wall construction: S7: the second stage of construction of bottom plates, the method to side wall construction below top board, side wall construction below side wall, middle plate above centering plate while middle plate is constructed, has the advantage that interlude side wall efficiency of construction is high and construction quality is good while top board construction.This portable side wall formwork jumbo mainly comprises side wall template, support and removable underframe, side wall template offers concreting mouth, chute plate is installed with above side wall template, this chassis has side wall template assembly reliable in quality, convenient advantage of building with top board, middle plate junction side wall section concrete.
Description
Technical field
The present invention relates to covered back-digging Construction Method of Metro Station and be applied to the device of the method, particularly relate to the superimposed wall construction method in covered back-digging subway station and portable side wall formwork jumbo.
Background technology
When the side wall of covered back-digging main structure of subway station and diaphragm wall adopt superimposed wall system, the main muscle of beam main tendon, plate, side wall tension rib all need be pre-buried in diaphragm wall, this embedded ribs not only quantity is many, and easily cause embedded ribs to misplace because placement of cage of reinforcing bar is inaccurate, embedded ribs cannot effectively be connected, due effect cannot be played, thus affect structural entity quality.Simultaneously, station adopts sheltered reverse excavation, ground next, two layers of side wall construct respectively after top board, middle plate complete, with the side wall section of top board, middle plate link position because limited space is difficult to carry out concreting, under normal circumstances, side wall concrete adopts the method construction of scaffold building full framing, side wall template, support need mount and dismount repeatedly, large, the consuming time length of workload, greatly affects programming, also there is higher potential safety hazard simultaneously; Further, by the impact of sheltered reverse excavation working procedure, the constuction joint position concreting of side wall and plate junction operates very difficult and compactness and cannot ensure.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, provides a kind of and can improve and top board, the middle construction quality of plate link position side wall section and the superimposed wall construction method in covered back-digging subway station of efficiency of construction and portable side wall formwork jumbo.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
The superimposed wall construction method in a kind of covered back-digging subway station, described superimposed wall comprises a pair diaphragm wall, be located at the top board between a pair diaphragm wall, middle plate, first phase base plate and the second stage of base plate, and the side wall arranged inside a pair diaphragm wall, each body of wall and plate body are constructed according to the following steps:
S1: construction of diaphragm wall;
S2: side wall construction below top board and top board: side wall groove below excavation top board foundation ditch and top board, carry out diaphragm wall dabbing and chemical cleaning project, template construction more successively, arrangement of reinforcement is constructed and concrete pouring construction, side wall waterproof construction, form side wall below the top board and top board that are connected as a single entity with diaphragm wall;
S3: side wall above middle plate and middle plate, side wall construction below middle plate: after side wall concrete reaches design strength below top board and top board, carry out B1 soil excavation, side wall groove below plate foundation ditch and middle plate in formation, carry out diaphragm wall dabbing and chemical cleaning project successively again, template construction, side wall waterproof construction, arrangement of reinforcement construction and concrete pouring construction, template for the formation of side wall above middle plate is set above middle plate foundation ditch when template construction, side wall above plate and middle plate is formed in being connected as a single entity with diaphragm wall after concrete pouring construction, side wall below middle plate,
S4: B1 interlude side wall is constructed: after side wall reaches design strength below side wall, middle plate above middle plate and middle plate, B1 interlude side wall is constructed, forms the B1 interlude side wall above side wall and middle plate between side wall below top board;
S5: first phase construction of bottom plates: to two layers, underground soil excavation, clears up and after tamping substrate, then to first phase construction of bottom plates, forms the first phase base plate be connected as a single entity with diaphragm wall;
S6: two layers, underground interlude side wall construction: after first phase base plate reaches design strength, carries out the interlude side wall construction of two layers, underground, two layers, the underground in formation below plate between side wall and first phase base plate interlude side wall;
S7: the second stage of construction of bottom plates: after two layers, underground interlude side wall reaches design strength, carry out the second stage of construction of bottom plates, forms the second stage of base plate be connected as a single entity with two layers, underground interlude side wall.
Described step S1: construction of diaphragm wall, comprises step by step following:
S1.1: by surveying and locating construction guide wall of underground continuous wall, framing excavation by troughs diaphragm wall foundation trench, and make diaphragm wall reinforcing cage;
S1.2: U-shaped is set at diaphragm wall reinforcing cage top and hangs muscle, with steel shoulder pole through hanging muscle, diaphragm wall reinforcing bar cage hoisting is entered groove, steel shoulder pole is placed in leads wall end face, before making U-shaped hangs muscle, wall end face absolute altitude H1 is led in measurement, according to diaphragm wall reinforcing cage cage top design elevation H2 and steel shoulder pole thickness H3, the length that calculating U-shaped hangs muscle is L, design formulas: L=(H1-H2)+H3;
S1.3: with 25m
3the speed concreting of/h, building the conduit insertion concrete degree of depth is 1.5m ~ 3m.
When carrying out described step S4 and step S6, with portable side wall formwork jumbo auxiliary construction, described portable side wall formwork jumbo comprises side wall template, described side wall template offers concreting mouth and top is installed with chute plate, after described side wall template is placed in position to be onstructed, portable side wall formwork jumbo is fixed, then complete concreting by described concreting mouth and chute plate.
A kind of portable side wall formwork jumbo, comprise side wall template, support that many Pin are longitudinally arranged in parallel and moveable underframe, described side wall model sheetinstallat is on described support, described support installing is on described underframe, described side wall template offers concreting mouth, is installed with chute plate above side wall template.
Described underframe comprises longitudinal beam of underframe and body transom, and each body transom to be longitudinally distributed between described longitudinal beam of underframe and to be fixedly connected with longitudinal beam of underframe, and described longitudinal beam of underframe is provided with longitudinal roller and transverse-roller.
Described longitudinal beam of underframe comprises the channel-section steel of two opposing Two bors d's oeuveres welding of opening, and described longitudinal roller and transverse-roller are located between two channel-section steels, and described transverse-roller is positioned at body transom and longitudinal beam of underframe junction.
Described is set up in above body transom, locator card is provided with above described transverse-roller, in the middle part of described locator card hollow upwardly in step and longitudinally the left and right sides be provided with expansion edge, expansion edge in both sides opens screwed hole, the junction of both sides expansion edge and central protrusion is provided with the locating slot of transverse-roller, be fastened on described frame bottom in the middle part of described locator card and be fixedly connected with support, both sides are expanded edge and are connected with described longitudinal beam of underframe bolt.
Described support is at right angles trapezoidal, comprise the rack cross-bar that support brace, the rack rod vertically arranged and Duo Gen transverse horizontal are arranged, described rack cross-bar is fixedly arranged between support brace and rack rod, cross bar knighthead is provided with between adjacent stent cross bar, be provided with vertical rod knighthead between rack cross-bar and rack rod, described side wall template is installed on rack rod by template back arris.
Described support brace and rack rod are formed by connecting by two or more, and each section of support brace and rack rod end are provided with junction plate, and described junction plate establishes screw.
The rack cross-bar two ends being positioned at described frame bottom are provided with the installing tache of band screw, each vertical rod knighthead is fixedly connected with by anchoring beam, described anchoring beam comprises at least two band steels, reserved anchor bolt installing space between adjacent band steel, between each band steel, longitudinally uniform welding has reinforcement steel plate, described support brace is also installed with the bracing piece connector that many rows are parallel.
Compared with prior art, the invention has the advantages that:
The superimposed wall construction method in covered back-digging subway station of the present invention, to side wall construction below top board while top board construction, centering plate upper and lower side wall construction while middle plate is constructed, again interlude side wall is built, well solve top board and side wall junction in prior art, middle plate and side wall and connect the problem that the concrete located is difficult to build, substantially increase efficiency of construction and the construction quality of interlude side wall.The present invention is when carrying out construction of diaphragm wall, U-shaped is set at diaphragm wall reinforcing cage top and hangs muscle, when diaphragm wall reinforcing bar cage hoisting is entered groove, be placed in steel shoulder pole and lead wall end face, U-shaped hangs the length of muscle in advance by leading wall end face absolute altitude H1, diaphragm wall reinforcing cage cage top design elevation H2 and steel shoulder pole thickness H3 determines, like this can to diaphragm wall reinforcing cage precise positioning, ensure each pre-buried beam, the position of the main muscle of plate and connector is accurate, thus guarantee beam, the main muscle of plate and connector can play effective connection function, improve integrally-built quality.When B1 interlude side wall of the present invention and the two layers of interlude side wall construction in underground, with portable side wall formwork jumbo auxiliary construction, formwork jumbo can move integrally in place, do not need repeatedly to carry out model sheetinstallat, dismounting and carrying, simple to operation, efficiency of construction is higher, construction quality is more reliable.
Portable side wall formwork jumbo of the present invention, by side wall template in advance by support installing on removable underframe, do not need repeatedly to carry out formwork assembling and disassembling, side wall template assembly reliable in quality, side wall template is offered concreting mouth, above side wall template, is provided with the concreting that chute plate facilitates side wall and top board junction, side wall and middle plate junction.
Accompanying drawing explanation
Fig. 1 is the flow chart of the superimposed wall construction method in covered back-digging subway station of the present invention.
Fig. 2 is the flow chart of construction of diaphragm wall step in the superimposed wall construction method in covered back-digging subway station of the present invention.
Fig. 3 is that diaphragm wall reinforcing bar cage hoisting of the present invention enters groove schematic diagram in place.
Fig. 4 is the structural representation of the superimposed wall in covered back-digging subway station of the present invention.
Fig. 5 is the structural representation of the portable side wall formwork jumbo of the present invention.
Fig. 6 is the structural representation of the present invention's portable side wall formwork jumbo medium-height trestle.
Fig. 7 is the structural representation of removable underframe in the portable side wall formwork jumbo of the present invention.
Fig. 8 is the structural representation of chute plate in the portable side wall formwork jumbo of the present invention.
Fig. 9 is the side wall formwork structure schematic diagram that in the portable side wall formwork jumbo of the present invention, mouth built by band.
Figure 10 is locator card right half part structural representation in the portable side wall formwork jumbo of the present invention.
In figure, each label represents:
100, diaphragm wall; 110, diaphragm wall foundation trench; 120, wall is led; 130, diaphragm wall reinforcing cage; 140, muscle is hung; 150, steel shoulder pole; 200, top board; 300, middle plate; 400, first phase base plate; 500, the second stage of base plate; 600, side wall; 610, side wall below top board; 620, side wall above middle plate; 630, side wall below middle plate; 640, B1 interlude side wall; 650, two layers, underground interlude side wall; 700, portable side wall formwork jumbo; 710, side wall template; 711, concreting mouth; 712, chute plate; 713, chute mouth; 714, template back arris; 720, support; 721, locator card; 7211, edge is expanded; 7212, locating slot; 722, rack cross-bar; 7221, installing tache; 723, rack rod; 724, support brace; 7241, connector; 725, cross bar knighthead; 726, vertical rod knighthead; 727, junction plate; 728, anchoring beam; 729, steel plate is strengthened; 730, underframe; 731, longitudinal beam of underframe; 732, body transom; 733, longitudinal roller; 734, transverse-roller.
Detailed description of the invention
Fig. 1 to Fig. 4 shows a kind of embodiment of the superimposed wall construction method in covered back-digging subway station of the present invention, the superimposed wall construction method in covered back-digging subway station of the present embodiment, superimposed wall comprises a pair diaphragm wall 100, be located at the top board 200 between a pair diaphragm wall 100, middle plate 300, first phase base plate 400 and the second stage of base plate 500, and the side wall 600 arranged inside a pair diaphragm wall 100, each body of wall and plate body are constructed according to the following steps:
S1: diaphragm wall 100 is constructed;
S2: below top board 200 and top board, side wall 610 is constructed: diaphragm wall 100 dabbing and cleaning: excavate 20cm side wall groove below top board foundation ditch and top board, again dabbing is carried out to diaphragm wall 100 surface, make pre-buried tie bar, connector exposes, pull straight tension rib, open connector over cap, cleaning folder mud and butter;
Template construction: after top board foundation ditch, top board beam and side wall channel excavation put in place, the thick C20 concrete of 10cm is performed as topotype on undisturbed soil surface, top board beam, side wall groove side surface build the thick brick wall of 12cm by laying bricks or stones and sand finish as side form, topotype, brick wall are laid sheet iron and are isolated, and be convenient to later stage topotype concrete, masonry walls cuts;
Side wall waterproof construction: after the surperficial dabbing of diaphragm wall 100, spray cement based penetrant crystalline water-repellent paint, quantity for spray controls as 1.5kg/m
2, after side wall channel excavation puts in place, channel bottom longitudinally installs rubber watertight strip along station pit, and waterstop is arranged on groove centre position, and half embeds in the fine sand of channel bottom tiling, and half embeds in side wall steel mesh reinforcement;
Arrangement of reinforcement is constructed: reinforcing bar binding is undertaken by station longitudinal length subdivision, and beam, post and access are avoided in each unit junction; In diaphragm wall 100, pre-buried tie bar is through side wall steel mesh reinforcement, performs crotch and connects, install main muscle connector bottom the vertical main muscle of side wall, when connector is installed, tile the thick fine sand of one deck 20cm in side wall groove, and connector one and main muscle are tightened, and other end is inserted in fine sand and protected; Layering colligation top board 200, top board beam steel, according to the horizontal bar that is linked in sequence of " first two ends, rear centre ", two ends horizontal bar is connected with pre-buried connector in diaphragm wall 100, and same level line welds between horizontal bar;
Concrete pouring construction: adopt concrete pump or pump truck subdivision to carry out concreting, completes side wall successively, top board beam, top board builds;
To construct side wall 610 below top board 200 and top board that rear formation and diaphragm wall 100 be connected as a single entity;
S3: above middle plate 300 and middle plate, below side wall 620, middle plate, side wall 630 is constructed: after side wall 610 concrete reaches design strength below top board 200 and top board, carry out B1 soil excavation, side wall groove below plate foundation ditch and middle plate in formation, then carry out successively:
Diaphragm wall 100 dabbing and chemical cleaning project: identical with S2;
Template construction: the topotype of side wall 630 below middle plate 300, middle plate-girder and middle plate, side form construction method are identical with S2, above middle plate 300 40cm place middle plate above side wall 620 construct and adopt punching block, fixed by pull bar;
Side wall waterproof construction: after the surperficial dabbing of diaphragm wall 100, spray cement based penetrant crystalline water-repellent paint, quantity for spray controls as 1.5kg/m
2, above middle plate 300 and middle plate, below side wall 620, middle plate, waterstop is longitudinally installed along foundation ditch in constuction joint position, side wall 630 junction, and upper end waterstop to be fixed on side wall reinforcing bar and to expose 1/2, and lower end waterstop mounting method is identical with S2;
Arrangement of reinforcement is constructed: during the vertical main muscle colligation of side wall, adopt sash weight messenger wire, main muscle is aimed at lengthways main steel bar connector pre-buried in side wall below top board 610, main muscle upwards one end reserves lap length, it is main muscle diameter that adjacent main muscle lap length is set to 10d, 45d(d respectively), connector is installed in the downward one end of main muscle, and connector inserts in the fine sand of side wall channel bottom laying, and other Joint Re-bar Constructions are identical with S2;
Concrete pouring construction: identical with S2;
To construct side wall 630 below side wall 620 above middle plate 300 and middle plate that rear formation and diaphragm wall 100 be connected as a single entity, middle plate;
S4: B1 interlude side wall 640 is constructed: after side wall 630 reaches design strength below side wall 620, middle plate above middle plate 300 and middle plate, B1 interlude side wall 640 is constructed, carries out successively:
Diaphragm wall 100 dabbing and chemical cleaning project: identical with S2;
Waterproof construction: after the surperficial dabbing of diaphragm wall 100, spray cement based penetrant crystalline water-repellent paint, quantity for spray controls as 1.5kg/m
2, before and after each side wall unit, vertically rubber watertight strip is installed respectively after having sprayed, waterstop is arranged in the middle of end mould, half embeds in side wall steel mesh reinforcement, second half exposes, embed when next unit side wall is constructed in steel mesh reinforcement, below waterstop upper end and top board, side wall 610 embedded water stop band overlaps, above waterstop lower end and middle plate, side wall 620 embedded water stop band overlaps, longitudinally the disposable Grouting Pipe of φ 12mm is buried underground along foundation ditch inside the waterstop that B1 interlude side wall 640 upper and lower side constuction joint position is pre-buried, high-strength cement slurry is injected after side wall concrete final set, prevent concrete setting from shrinking and produce constuction joint,
Arrangement of reinforcement is constructed: to complete inside B1 interlude side wall 640 after transverse horizontal reinforcing bar lays, carry out vertical main muscle colligation, main muscle upper end and top to have applied below top board pre-buried connector in side wall 610 and have tightened and be connected, above lower end and middle plate, in side wall 620, vertical main muscle is welded to connect, finally carry out B1 interlude side wall 640 transverse horizontal reinforcing bar binding, and be connected with pre-buried tie bar in diaphragm wall 100;
Template construction: with portable side wall formwork jumbo 700 auxiliary construction, portable side wall formwork jumbo 700 comprises side wall template 710, side wall template 710 offers concreting mouth 711 and top is installed with chute plate 712, is fixed by portable side wall formwork jumbo 700 after side wall template 710 is placed in position to be onstructed;
Concrete pouring construction: B1 interlude side wall 640 height 4.15m in the present embodiment, two-layer employing ground pump is divided to carry out concreting, it is 2.15m that first floor builds open height, pump line discharge port, vibrating head are inserted first row and build mouth, until stop building when concrete rises to 2.0m, closed first row builds mouth, then second layer concrete is built from the chute plate 712 at side wall template 710 top, stop building when concrete exceeds top constuction joint 10cm, when concrete starts initial set, surface, except the part of superelevation, is repaired smooth by artificial chisel;
The B1 interlude side wall 640 above side wall 610 and middle plate between side wall 620 below top board is formed after completing construction;
S5: first phase base plate 400 is constructed: to B1 soil excavation, clears up and after tamping substrate, then constructs to first phase base plate 400, carries out successively:
Diaphragm wall 100 dabbing and cleaning: identical with S2;
Cushion construction: after two layers, underground excavation of foundation pit puts in place, removes substrate and tamps, building the thick C20 concrete cushion of 18cm;
Waterproof construction: apply the thick waterproofing mortar mixing capillary crystalline waterproof coating material of 2cm above bed course, at first phase base plate 400 with side wall 600 junction along the longitudinal embedded water stop band of foundation ditch
Arrangement of reinforcement is constructed: when carrying out colligation first phase baseplate reinforcing bar, be welded to connect between horizontal bar, lower edge reinforcing bar horizontal bar two ends are connected with the pre-buried connector of diaphragm wall 100, upper limb reinforcing bar horizontal bar two ends perform 90 ° of elbows and side wall bar connecting, tension rib bottom performs crotch and lower edge bar connecting, it is tension rib diameter that 10d(d is reserved on top) lap length, and pre-buried in 90 ° of bendings, for being connected with the second stage of base plate 500;
Concrete pouring construction: identical with S2;
The first phase base plate 400 be connected as a single entity with diaphragm wall 100 is formed after completing construction;
S6: two layers, underground interlude side wall 650 is constructed: after first phase base plate 400 reaches design strength, carries out two layers, underground interlude side wall 650 and constructs, carry out successively:
Diaphragm wall 100 dabbing and cleaning: identical with S4;
Waterproof construction: identical with S4;
Arrangement of reinforcement is constructed: pre-buried the second stage of base plate horizontal bar, horizontal bar two ends mantle fiber, and one end is connected with connector pre-buried in diaphragm wall 100, and the other end installs connector;
Template construction: identical with S4;
Concrete pouring construction: in the present embodiment, two layers, underground interlude side wall 650 is highly 7.0m, on portable side wall formwork jumbo 700,2.15m, 4.15m and 6.15m At The Height is offered concreting mouth and is carried out concreting, the same S4 of casting method respectively;
Two layers, underground interlude side wall 650 in being formed after completing construction below plate between side wall 630 and first phase base plate 400;
S7: the second stage of base plate 500 is constructed: after two layers, underground interlude side wall 650 reaches design strength, carries out the second stage of base plate 500 and constructs, carry out successively:
Diaphragm wall 100 dabbing and cleaning: identical with S5;
First phase base plate 400 dabbing and cleaning: identical with cleaning method with diaphragm wall 100 dabbing;
Waterproof construction: identical with S5;
Arrangement of reinforcement is constructed: when carrying out the second stage of base plate steel bar binding, base plate horizontal bar is connected with the pre-buried connector of side wall, is connected between first phase base plate 400 with the second stage of base plate 500 by pre-buried tie bar;
Concrete pouring construction: identical with S5;
The second stage of base plate 500 be connected as a single entity with two layers, underground interlude side wall 650 is formed after completing construction.
The present invention constructs to side wall below top board 610 while top board 200 is constructed, while middle plate 300 is constructed, above centering plate, below side wall 620, middle plate, side wall 630 is constructed, respectively B1 interlude side wall 640, two layers, underground interlude side wall 650 are built again, avoid top board 200 and side wall 600 junction, middle plate 300 and constuction joint position, side wall 600 junction concrete are difficult to the problem of building, and substantially increase efficiency of construction and the construction quality of side wall 600; When carrying out concreting to B1 interlude side wall 640 and two layers, underground interlude side wall 650, the portable side wall formwork jumbo 700 of band chute plate 712 is adopted to coordinate the chute mouth 713 forming concreting, be convenient to B1 interlude side wall 640 and two layers, underground interlude side wall 650 concrete pouring construction, improve efficiency of construction and construction quality.
In the present embodiment, step S1: diaphragm wall 100 is constructed, comprises step by step following:
S1.1: by surveying and locating construction guide wall of underground continuous wall 120, framing excavation by troughs diaphragm wall foundation trench 110, and make diaphragm wall reinforcing cage 130;
S1.2: U-shaped is set at diaphragm wall reinforcing cage 130 top and hangs muscle 140, with steel shoulder pole 150 through hanging muscle 140, diaphragm wall reinforcing cage 130 is lifted into groove, steel shoulder pole 150 is placed in leads wall 120 end face, before making U-shaped hangs muscle 140, measure and lead wall 120 end face absolute altitude H1, according to diaphragm wall reinforcing cage 130 cage top design elevation H2 and steel shoulder pole 150 thickness H3, the length that calculating U-shaped hangs muscle 140 is L, design formulas: L=(H1-H2)+H3;
S1.3: with 25m
3the speed concreting of/h, building the conduit insertion concrete degree of depth is 1.5m ~ 3m.
When carrying out diaphragm wall 100 and constructing, U-shaped is set at diaphragm wall reinforcing cage 130 top and hangs muscle 140, when diaphragm wall reinforcing cage 130 is lifted into diaphragm wall foundation trench 110, be placed in steel shoulder pole 150 and lead wall 120 end face, U-shaped hangs the length of muscle 140 in advance by leading wall 120 end face absolute altitude H1, diaphragm wall reinforcing cage 130 cage top design elevation H2 and steel shoulder pole 150 thickness H3 determines, like this can to diaphragm wall reinforcing cage 130 precise positioning, ensure each pre-buried beam, the position of the main muscle of plate and connector is accurate, thus guarantee beam, the main muscle of plate and connector can play effective connection function, improve the integrally-built quality of superimposed wall.
Fig. 5 to Figure 10 shows a kind of embodiment of the portable side wall formwork jumbo of the present invention, the portable side wall formwork jumbo of the present embodiment, comprise side wall template 710, the support 720 that many Pin are longitudinally arranged in parallel and moveable underframe 730, side wall template 710 is installed on support 720, support 720 is installed on underframe 730, side wall template 710 offers concreting mouth 711, chute plate 712 is installed with above side wall template 710, by side wall template 710 is arranged on removable underframe 730 by support 720 in advance, do not need repeatedly to carry out formwork assembling and disassembling, the assembled reliable in quality of side wall template 710, side wall template 710 is offered concreting mouth 711, be provided with chute plate 712 above side wall template 710 to be convenient to interlude side wall concrete and to build.
In the present embodiment, underframe 730 comprises longitudinal beam of underframe 731 and body transom 732, each body transom 732 to be longitudinally distributed between longitudinal beam of underframe 731 and to be fixedly connected with longitudinal beam of underframe 731, longitudinal beam of underframe 731 is provided with longitudinal roller 733 and transverse-roller 734, by arranging longitudinal roller 733 and transverse-roller 734 is convenient to moving integrally with in place of chassis.
In the present embodiment, longitudinal beam of underframe 731 comprises the channel-section steel of two opposing Two bors d's oeuveres welding of opening, and longitudinal roller 733 and transverse-roller 734 are located between two channel-section steels, and transverse-roller 734 is positioned at body transom 732 and longitudinal beam of underframe 731 junction.
In the present embodiment, support 720 is located at above body transom 732, locator card 721 is provided with above transverse-roller 734, in the middle part of locator card 721 hollow upwardly in step and longitudinally the left and right sides be provided with expand edge 7211, expansion edge 7211 in both sides opens screwed hole, both sides expansion edge 7211 and the junction of central protrusion are provided with the locating slot 7212 of transverse-roller 734, to be fastened in the middle part of locator card 721 bottom support 720 and to be fixedly connected with support 720, both sides are expanded edge 7211 and are connected with longitudinal beam of underframe 731 bolt, realize being fixedly connected with of support 720 and underframe 730, stabilized structure is reliable.
In the present embodiment, support 720 is at right angles trapezoidal, comprise the rack cross-bar 722 that support brace 724, the rack rod 723 vertically arranged and Duo Gen transverse horizontal are arranged, rack cross-bar 722 is fixedly arranged between support brace 724 and rack rod 723, cross bar knighthead 725 is provided with between adjacent stent cross bar 722, be provided with vertical rod knighthead 726 between rack cross-bar 722 and rack rod 723, side wall template 710 is installed on rack rod 723 by template back arris 714.
In the present embodiment, support brace 724 and rack rod 723 are formed by connecting by two or more, each section of support brace 724 and rack rod 723 end are provided with junction plate 727, junction plate establishes screw, many rod members are connected by threaded engagement, different side wall construction height can be adapted to, keep away that rod member size is long causes strength deficiency.
In the present embodiment, support brace 724 is also installed with the bracing piece connector 7241 that many rows are parallel, adopts long steel pipe, fastener, will connect with row's bracing piece connector 7241, and reinforce each Pin support 720 further.Rack cross-bar 722 two ends be positioned at bottom support 720 are provided with the installing tache 7221 of band screw, and penetrate Lengthened bolt in installing tache 7221, Lengthened bolt is fixed on ground.Each vertical rod knighthead 726 is fixedly connected with by anchoring beam 728, anchoring beam 728 comprises at least two band steels, reserved high-strength bolt installing space between adjacent band steel, between each band steel, longitudinally uniform welding has reinforcement steel plate 729, strengthen intensity and reliability that steel plate 729 promotes anchoring beam 728 further, adopt φ 32mm high-strength bolt through anchoring beam installing space, to become miter angle to be connected fastening with ground pre-embedded anchoring bolts, realizes the in place of chassis and fix.
Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, when not departing from technical solution of the present invention scope, can utilize the technology contents of above-mentioned announcement to make many possible variations and modification to technical solution of the present invention, or being revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to the technology of the present invention essence to any simple modification made for any of the above embodiments, equivalent variations and modification, all should drop in the scope of technical solution of the present invention protection.
Claims (6)
1. the superimposed wall construction method in covered back-digging subway station, described superimposed wall comprises a pair diaphragm wall (100), be located at the top board (200) between a pair diaphragm wall (100), middle plate (300), first phase base plate (400) and the second stage of base plate (500), and the side wall (600) arranged inside a pair diaphragm wall (100), it is characterized in that: each body of wall and plate body are constructed according to the following steps:
S1: diaphragm wall (100) is constructed;
S2: side wall (610) construction below top board (200) and top board: side wall groove below excavation top board foundation ditch and top board, carry out diaphragm wall (100) dabbing successively again and chemical cleaning project, template construction, side wall waterproof construction, arrangement of reinforcement are constructed and concrete pouring construction, form side wall (610) below the top board (200) and top board that are connected as a single entity with diaphragm wall (100);
S3: side wall (620) above middle plate (300) and middle plate, side wall (630) construction below middle plate: after side wall (610) concrete reaches design strength below top board (200) and top board, carry out B1 soil excavation, side wall groove below plate foundation ditch and middle plate in formation, carry out diaphragm wall (100) dabbing and chemical cleaning project successively again, template construction, side wall waterproof construction, arrangement of reinforcement construction and concrete pouring construction, template for the formation of side wall (620) above middle plate is set above middle plate foundation ditch when template construction, side wall (620) above the middle plate (300) be connected as a single entity with diaphragm wall (100) and middle plate is formed after concrete pouring construction, side wall (630) below middle plate,
S4: B1 interlude side wall (640) is constructed: side wall (620) above middle plate (300) and middle plate, after below middle plate, side wall (630) reaches design strength, B1 interlude side wall (640) is constructed, with portable side wall formwork jumbo (700) auxiliary construction, described portable side wall formwork jumbo (700) comprises side wall template (710), described side wall template (710) offers concreting mouth (711) and top is installed with chute plate (712), after described side wall template (710) being placed in position to be onstructed, portable side wall formwork jumbo (700) is fixed, concreting is completed again by described concreting mouth (711) and chute plate (712), form the B1 interlude side wall (640) above side wall (610) and middle plate between side wall (620) below top board,
S5: first phase base plate (400) is constructed: to two layers, underground soil excavation, clear up and after tamping substrate, then to first phase base plate (400) construction, is formed and first phase base plate (400) that diaphragm wall (100) is connected as a single entity;
S6: two layers, underground interlude side wall (650) construction: after first phase base plate (400) reaches design strength, carry out interlude side wall (650) construction of two layers, underground, with described portable side wall formwork jumbo (700) auxiliary construction, after described side wall template (710) being placed in position to be onstructed, described portable side wall formwork jumbo (700) is fixed, concreting is completed again, two layers, the underground in formation below plate between side wall (630) and first phase base plate (400) interlude side wall (650) by described concreting mouth (711) and chute plate (712);
S7: the second stage of base plate (500) is constructed: after two layers, underground interlude side wall (650) reaches design strength, carries out the second stage of base plate (500) construction, forms the second stage of base plate (500) be connected as a single entity with two layers, underground interlude side wall (650).
2. the superimposed wall construction method in covered back-digging subway station according to claim 1, is characterized in that: described step S1: diaphragm wall (100) is constructed, and comprises step by step following:
S1.1: by surveying and locating construction guide wall of underground continuous wall (120), framing excavation by troughs diaphragm wall foundation trench (110), and make diaphragm wall reinforcing cage (130);
S1.2: U-shaped is set at diaphragm wall reinforcing cage (130) top and hangs muscle (140), with steel shoulder pole (150) through hanging muscle (140), diaphragm wall reinforcing cage (130) is lifted into groove, steel shoulder pole (150) is placed in leads wall (120) end face, muscle (140) is hung front at making U-shaped, wall (120) end face absolute altitude H1 is led in measurement, according to diaphragm wall reinforcing cage (130) cage top design elevation H2 and steel shoulder pole (150) thickness H3, the length that calculating U-shaped hangs muscle (140) is L, design formulas: L=(H1-H2)+H3;
S1.3: with 25m
3the speed concreting of/h, building the conduit insertion concrete degree of depth is 1.5m ~ 3m.
3. a portable side wall formwork jumbo, it is characterized in that: comprise side wall template (710), the support (720) that many Pin are longitudinally arranged in parallel and moveable underframe (730), described side wall template (710) is installed on described support (720), described support (720) is installed on described underframe (730), described side wall template (710) offers concreting mouth (711), side wall template (710) top is installed with chute plate (712), described underframe (730) comprises longitudinal beam of underframe (731) and body transom (732), each body transom (732) to be longitudinally distributed between described longitudinal beam of underframe (731) and to be fixedly connected with longitudinal beam of underframe (731), described longitudinal beam of underframe (731) is provided with longitudinal roller (733) and transverse-roller (734), described longitudinal beam of underframe (731) comprises the channel-section steel of two opposing Two bors d's oeuveres welding of opening, described longitudinal roller (733) and transverse-roller (734) are located between two channel-section steels, and described transverse-roller (734) is positioned at body transom (732) and longitudinal beam of underframe (731) junction, body transom (732) top is located at by described support (720), locator card (721) is provided with in described transverse-roller (734) top, described locator card (721) middle part hollow is upwardly step and longitudinally the left and right sides is provided with expansion edge (7211), screwed hole is opened in both sides expansion edge (7211), both sides expansion edge (7211) are provided with the locating slot (7212) of transverse-roller (734) with the junction of central protrusion, described locator card (721) middle part is fastened on described support (720) bottom and is fixedly connected with support (720), both sides are expanded edge (7211) and are connected with described longitudinal beam of underframe (731) bolt.
4. portable side wall formwork jumbo according to claim 3, it is characterized in that: described support (720) is at right angles trapezoidal, comprise support brace (724), the rack cross-bar (722) that the rack rod (723) of vertical layout and many transverse horizontal are arranged, described rack cross-bar (722) is fixedly arranged between support brace (724) and rack rod (723), cross bar knighthead (725) is provided with between adjacent stent cross bar (722), vertical rod knighthead (726) is provided with between rack cross-bar (722) and rack rod (723), described side wall template (710) is installed on rack rod (723) by template back arris (714).
5. portable side wall formwork jumbo according to claim 4, it is characterized in that: described support brace (724) and rack rod (723) are formed by connecting by two or more, each section of support brace (724) and rack rod (723) end are provided with junction plate (727), and (727) establish screw to described junction plate.
6. portable side wall formwork jumbo according to claim 5, it is characterized in that: rack cross-bar (722) two ends being positioned at described support (720) bottom are provided with the installing tache (7221) of band screw, each vertical rod knighthead (726) is fixedly connected with by anchoring beam (728), described anchoring beam (728) comprises at least two band steels, reserved anchor bolt installing space between adjacent band steel, between each band steel, longitudinally uniform welding has reinforcement steel plate (729), described support brace (724) is also installed with the bracing piece connector (7241) that many rows are parallel.
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| CN104314069B (en) * | 2014-10-15 | 2016-03-09 | 中国建筑第八工程局有限公司 | Side wall reserved steel bar positioning construction method in reverse construction |
| CN104695488B (en) * | 2015-03-17 | 2016-08-17 | 深圳大学建筑设计研究院 | A kind of underground outer water proof structure of overlapping wall |
| CN105804115B (en) * | 2016-02-29 | 2018-08-31 | 济南轨道交通集团有限公司 | Assembled ground-connecting-wall or prefabricated pile and assembled underground station integrative construction device and construction method |
| CN106049531B (en) * | 2016-06-08 | 2018-06-12 | 瑞洲建设集团有限公司 | High-moisture ultra-soft soil box multicell cast in place frame method for tunnel construction |
| CN106917415B (en) * | 2017-04-10 | 2024-01-19 | 金陵科技学院 | Prefabricated underground structure and construction method thereof |
| CN106988319A (en) * | 2017-04-10 | 2017-07-28 | 中铁隧道集团有限公司 | A kind of rapid constructing method of large deep foundation pit agent structure side wall |
| CN107938701A (en) * | 2017-11-23 | 2018-04-20 | 上海建科工程咨询有限公司 | Subway station covered back-digging overlapping wall construction technology based on prefabricated ground-connecting-wall |
| CN108571009B (en) * | 2018-05-04 | 2022-01-04 | 中国建筑第四工程局有限公司 | Construction method for side wall of full-cover excavation top-down subway station |
| CN108999194A (en) * | 2018-08-20 | 2018-12-14 | 中铁十二局集团有限公司 | A kind of constructing structure and construction method of Deep Foundation Pit of Metro Stations Partial Inverse work |
| CN110080295A (en) * | 2019-04-23 | 2019-08-02 | 中铁第四勘察设计院集团有限公司 | A kind of lid of assembled vault greatly across no column underground structure digs full-reverse construction method |
| CN110258640B (en) * | 2019-07-11 | 2020-07-03 | 吉林大学 | Construction method of superposed wall system for cover-excavation top-down construction |
| CN114645551A (en) * | 2022-03-11 | 2022-06-21 | 中国建筑第六工程局有限公司 | Method for reserving joint of side wall reinforcing steel bars of subway station by cover-and-dig top-down method |
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| CN102433894B (en) * | 2011-12-30 | 2013-11-06 | 中铁二局股份有限公司 | Construction method for station side wall by covered top-down excavation method |
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