CN101892667B - Foundation pit support device and construction method - Google Patents
Foundation pit support device and construction method Download PDFInfo
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- CN101892667B CN101892667B CN2010102346699A CN201010234669A CN101892667B CN 101892667 B CN101892667 B CN 101892667B CN 2010102346699 A CN2010102346699 A CN 2010102346699A CN 201010234669 A CN201010234669 A CN 201010234669A CN 101892667 B CN101892667 B CN 101892667B
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Abstract
The invention relates to a foundation pit support device and a construction method. For different address conditions, two or more of an SMW (soil mixing wall) construction method pile system, an internal supporting system, a concrete revetment system and a soil nailing wall revetment system are comprehensively applied. A concrete circuit girt is arranged at the top end of an SMW construction method pile; and profiled bars are inserted into the pile, and have equal or unequal lengths. The internal support system is a slanting steel pipe support or a horizontal support. The soil nailing wall revetment system is formed in a way that: a concrete revetment is arranged on the inner side, from the pit top to the pit bottom, of a foundation pit, and is paved with a reinforced concrete surface layer; and soil nails are inserted into soil around the foundation pit vertical to the reinforced concrete surface layer. The foundation pit support device and the construction method have the advantages of effectively reducing foundation pit support cost and construction cost and accelerating the construction, and are particularly suitable for the support of the large-area foundation pits and construction plants of which infrared spaces between subsurface structures and the ground are small.
Description
Technical field
The present invention relates to a kind of foundation pit support device and job practices, belong to the building structure construction technical field, be particularly useful for surrounding enviroment are had the construction of the large-area deep foundation pit engineering of strict demand.
Background technology
Along with high level and super large space structure building thing get more and more, the cutting depth of foundation ditch and area are also increasing, and the underground space of excavation can be used as garage, storage, market and civil air defense constructions and installations etc.Behind the building foundation pit excavation, need make supporting and protection structure, to prevent local or large-area landslide to its periphery.
For traditional Base hole supporting technology, bad for the foundation ditch soil property, excavation of foundation pit is deep, particularly under the situation that the foundation ditch planar dimension is bigger, if adopt supporting form in castinplace pile+concrete according to routine, the supporting measure cost that seems is than higher, and construction period is long.
For SMW worker's method of the prior art stake, its construction is convenient, there is not mud off little to the pollution of environment, shaped steel can reclaim after basement construction finished, reduced the cost of supporting, but this method has certain negative effect to construction speed, and is poor slightly to the safety effect effect stable and foundation ditch of side slope simultaneously.
And for support the method that replaces the large area concrete horizontal support with oblique steel pipe, it has tangible positive influences to construction costs and construction speed, and use anchor pole (pipe) technology also stable the and foundation ditch safety of side slope to be played positive role, but use this method that environment is had certain pollution.
Based on this, how to design a kind of supporting that can be suitable for large-scale excavation, the foundation pit supporting method that can effectively reduce pattern foundation pit supporting structure cost and cost, accelerating construction progress simultaneously again is a present stage problem anxious to be solved.
Summary of the invention
The present invention is in order to overcome above-mentioned defective, a kind of foundation pit support device and corresponding construction method are provided, can effectively reduce pattern foundation pit supporting structure cost and cost, be particularly suitable for supporting and the underground structure and the narrow construction plant of occupation of land red line spacing of large-scale excavation.
For achieving the above object, the present invention adopts following technical scheme:
A kind of base pit stand construction is applicable to the supporting of large-scale excavation: comprehensively adopted in SMW worker's method pile body system, inner supporting body system, concrete revetment system and the soil nailing wall bank protection system both or both above combinations, specifically construction sequence is as follows:
(1) preparation of construction;
(2) the foundation ditch periphery possesses the foundation ditch of putting sloping condition for open area, adopts concrete revetment system or soil nailing wall bank protection system; The concrete revetment system is adopted during to the vertical distance of cheating the end＜4m in hole top, and the gradient of concrete revetment is 1:0.5, hole top is when cheating the straight distance 〉=4m of dolly, adopt soil nailing wall bank protection system, the gradient of concrete revetment is 1:0.7, carries out soil nailing wall slope protection construction at concrete revetment simultaneously;
(3) be to carry out the supporting foundation pit position to carry out the support post pile driving construction intending adopting inner supporting body, the stake of foundation ditch periphery construction SMW worker method;
(4) on SMW worker's method stake top coagulation fortifield village purlin is set one;
(5) be to carry out the supporting position to carry out the construction of basement sole plate intending adopting inner supporting body, treat that sole plate intensity reaches after the designing requirement that the construction reinforced bar concrete supports bracket on sole plate, setting up oblique steel pipe between coagulation fortifield village purlin and steel concrete support bracket supports, between supporting, oblique steel pipe connects with shaped steel steel connecting rod, after oblique steel pipe supports and finishes, construction basement load-carrying members;
(6) the basement load-carrying members are constructed to finish and are removed oblique steel pipe support;
(7) backfilling of earthwork;
(8) be that SMW worker's method pile driving construction is carried out in the foundation ditch position intending adopting SMW worker's method pile body;
(9) in the stake of SMW worker's method, insert shaped steel;
(10) treat that basement load-carrying members concrete strength reaches prescribed strength, by being arranged symmetrically in the hydraulic jack of waiting to pull out the shaped steel both sides, transfer to shaped steel, the yellow ground backfill is adopted in the slit that shaped steel stays.
The wall of soil nailing described in step 2 slope protection construction is included in soil nailing wall design attitude and sprays 50mm thickness concrete pavement, makes soil nailing and on soil nailing nail body the centering locating support is installed, with Grouting Pipe and soil nailing one logical the insertion in the soil nailing hole, on 50mm thickness concrete pavement, lay steel mesh reinforcement, at last sprayed mortar surface layer operation once more on the reinforcing bar wire side.
Described soil nailing is muscle anchor pole and steel pipe anchor tube; It is pointed that steel pipe anchor tube one end is made stake, and have plum blossom shape aperture on its tube wall, and its outer wall is provided with the angle steel barb.
Described step 5 is for being provided with horizontal support in the described coagulation of step 4 fortifield village purlin side, horizontal support comprises main the support and the contact support, main support and contact are supported and are formed the intersecting parallels steelframe in the plane, bottom supporting at the node of intersecting parallels steelframe has column, and column lower end is supported on the stand column pile top.
The method of SMW worker described in step 8 pile driving construction order is as follows:
A) pile-forming machine perching;
B) preparation cement paste;
C) stir sinking in advance;
D) whitewashing, stirring, lifting;
E) shaped steel external coating anti-friction agent;
F) will locate shaped steel and be fixed on the guide rail, and be placed in the shaped steel of location with loop wheel machine lifting shaped steel, and vertically insert in the cement paste, until projected depth along location shaped steel;
G) shaped steel is fixed on the location shaped steel of laying the groove both sides, cement paste solidifies in the hole.
Described shaped steel is H shaped steel; Nine laminates are set between H shaped steel and the coagulation fortifield village purlin isolates.
The device that described base pit stand construction is used, for SMW worker's method pile body system, inner supporting body system, concrete revetment system and the above system of soil nailing wall bank protection system or make up more than both, described SMW worker's method stake top is provided with coagulation fortifield village purlin, interpolation shaped steel, the slotting shaped steel equal in length of institute or do not wait in the pile body; Described inner supporting body is that oblique steel pipe supports or horizontal support, and oblique steel pipe supports an end and is supported on the coagulation fortifield village purlin, and the other end is supported on the support bracket of basement sole plate end face; Horizontal support comprises main support and contact is supported, and main support and contact is supported on and forms the intersecting parallels steelframe on the same horizontal plane has column in the bottom supporting of the node of intersecting parallels steelframe, and column lower end is supported on the stand column pile top; Described soil nailing wall bank protection system is covered with the steel concrete surface layer, perpendicular to being inserted with soil nailing in the steel concrete surface layer foundation ditch surrounding soil for to the foundation ditch inboard of cheating position, the end concrete revetment being arranged from the top, hole in the bank protection position.
Top, described concrete revetment hole is during to the vertical distance of cheating the end＜4m, and the bank protection gradient is 1:0.5, and the top, hole is to cheating the straight distance of dolly〉during 4m, the bank protection gradient is 1:0.7.
Compared with prior art the present invention has following characteristics and beneficial effect:
Base pit stand construction described in the present invention has adopted multiple support system in conjunction with engineering actual conditions and surrounding enviroment, has reduced the cost of pattern foundation pit supporting structure effectively.Under the situation of not considering Liu Tu district difficulty of construction, adopt oblique steel pipe to support a kind of cost-effective support pattern of can yet be regarded as, especially be fit to the supporting of large-scale excavation.And the mode that has adopted pile wall interaction is used in the stake of SMW worker's method, has not only reduced the cost of support system, and is very suitable for underground structure and takes up an area of the narrow construction plant of red line spacing, and is especially suitable in the location of an inch of land is an inch of gold.The piled anchor unification has then been expanded working space for the underground structure construction.
Description of drawings
The present invention will be further described in detail below in conjunction with accompanying drawing.
Fig. 1 is that embodiment is at supporting scheme layout plan more than-5.50 meters;
Fig. 2 is that embodiment is at supporting scheme layout plan below-5.50 meters;
Fig. 3 is the concrete revetment system of the embodiment foundation ditch discrepancy in elevation during less than 4 meters;
Fig. 4 is the soil nailing wall bank protection system of the embodiment foundation ditch discrepancy in elevation during less than 4 meters;
Fig. 5 is an A-B section among the embodiment, C-D section, E-F section support form;
Fig. 6 is a B-C section among the embodiment, D-E section support form.
Reference numeral: 1-foundation ditch, 2-horizontal support, top, 3-hole, the end, 4-hole, 5-concrete revetment, 6-soil nailing wall bank protection, 7-soil nailing, 8-coagulation fortifield village purlin, 9-basement sole plate, 10-support bracket, the oblique steel pipe support of 11-, the stake of 12-SMW worker's method.
The specific embodiment
Following mask body in conjunction with the accompanying drawings 1-6 the present invention is further illustrated.
Typical case of the present invention implements engineering: underground 2 layers of engineering, and the hole end 4 absolute altitudes-11.6m, hole 2 substrate absolute altitude-17.3m in the local dip, 82 * 223 meters of foundation ditch 1 planar dimensions, about 18000 square meters of foundation ditch 1 area belong to the ultra-large type foundation ditch.This engineering north side and east side are vacant lot, and the west side is the Fortune Finance Center mansion engineering of Hot work in progress, and the southern side is the forest park, about about 300 meters apart from the Qiantang River.According to above foundation ditch surrounding environment, pattern foundation pit supporting structure is divided into A-B, B-C, C-D, D-E, E-F and six construction sections of F-A, these six construction sections at supporting scheme layout plan more than-5.50 meters referring to accompanying drawing 1, at supporting scheme layout plan below-5.50 meters referring to accompanying drawing 2.
Concrete bracing of foundation pit design scheme is as follows:
The A-F section is positioned at foundation ditch 1 north side, and foundation ditch 1 limit is an open area, possesses and puts sloping condition, so A-F adopts concrete revetment system and soil nailing wall bank protection system form referring to accompanying drawing 3 and accompanying drawing 4.The concrete revetment system is adopted during to the vertical distance of cheating the end＜4m in hole top, and the gradient of concrete revetment is 1:0.5, hole top is when cheating the straight distance 〉=4m of dolly, adopt soil nailing wall bank protection system, the gradient of concrete revetment is 1:0.7, carries out soil nailing wall slope protection construction at concrete revetment simultaneously; Described soil nailing wall bank protection 6 constructions are included in soil nailing wall design attitude and spray 50mm thickness concrete pavement, make soil nailing 7 and on soil nailing nail body the centering locating support is installed, with Grouting Pipe and soil nailing 7 one logical insertions in the soil nailing hole, on 50mm thickness concrete pavement, lay steel mesh reinforcement, at last sprayed mortar surface layer operation once more on the reinforcing bar wire side.Described soil nailing 7 is muscle anchor pole and steel pipe anchor tube; It is pointed that steel pipe anchor tube one end is made stake, and have plum blossom shape aperture on its tube wall, and its outer wall is provided with the angle steel barb.
A-B, C-D, E-F construction section support form is referring to accompanying drawing 5, steel concrete supports the oblique steel pipe of bracket 10 usefulness Φ 609 * 16mm and supports 11 between one reinforced concrete fortifield village purlin 8 of center absolute altitude-5.9 m place design and big base plate, tiltedly throw tie distance and mostly be 8.4m, connect with H400 * 400 * 13 * 24mm steel connecting rod between steel supports, every Φ 609 steel pipes support prestressing force and are set to 400KN.
B-C, the D-E section adopts SMW worker's method stake 12 and interior supporting form referring to Fig. 6, foundation ditch 1 inherent center absolute altitude-one reinforced concrete fortifield village purlin 8 of 4.4m place design, horizontal support 2; The concrete horizontal supporting section is of a size of: 600 * 700,700 * 700mm, horizontal support is provided with 12 root posts, and the bottom is a Φ 800mm bored pile, and stand column pile concrete strength of pile grade is C25, top is lattice groined type steelframe, and stake end absolute altitude is at the following 10m of the hole ends 4 absolute altitude.
The overall sequence of construction of foundation ditch is as follows:
(1) preparation of construction;
(2) the foundation ditch periphery possesses the foundation ditch of putting sloping condition for open area, adopts concrete revetment system or soil nailing wall bank protection system; During hole top 3 to the hole vertical distance at the end 4＜4m, adopt the concrete revetment system, the gradient of concrete revetment 5 is 1:0.5, hole top is when cheating the straight distance 〉=4m of dolly, adopt soil nailing wall bank protection system, the gradient of concrete revetment 5 is 1:0.7, carries out soil nailing wall slope protection construction at concrete revetment simultaneously;
(3) adopt support system to carry out supporting foundation pit 1 position in plan and carry out the support post pile driving construction, foundation ditch periphery construction SMW worker method stake 12;
(4) on SMW worker's method stake 12 tops coagulation fortifield village purlin 8 is set one;
(5) adopt support system to carry out the supporting position in plan and carry out 9 constructions of basement sole plate, treat that sole plate intensity reaches after the designing requirement that the construction reinforced bar concrete supports bracket 10 on sole plate, between coagulation fortifield village purlin and steel concrete support bracket, set up oblique steel pipe and support 11, between supporting, oblique steel pipe connects with shaped steel steel connecting rod, after oblique steel pipe support system is finished, construction basement load-carrying members;
(6) the basement load-carrying members are constructed to finish and are removed oblique steel pipe support 11;
(7) backfilling of earthwork;
(8) be that SMW worker's method stake 12 constructions are carried out in the foundation ditch position intending adopting SMW worker's method pile body;
(9) in the stake of SMW worker's method, insert shaped steel;
(10) treat that basement load-carrying members concrete strength reaches prescribed strength, adopting special fixture and jack is reversed beam with the collar tie beam, by being arranged symmetrically in the even application of force of hydraulic jack of waiting to pull out the shaped steel both sides, coming and going work with the jack cylinder stroke extracts piecemeal, being loaded and transported out by mobile crane is recyclable H shaped steel, H shaped steel rises when pulling out and will vertically exert oneself, and does not allow to have tilted to pull out or lateral impact shaped steel.When shaped steel is extracted, the timely backfill of yellow ground is adopted in the slit that H shaped steel stays.
Wherein the described preparation of construction in the step () comprises the step that prepare in the place with measurement defence line, guide groove excavate and location shaped steel is placed successively.Specific as follows:
Preparation of construction
1) place is prepared and is measured unwrapping wire
Before machinery is marched into the arena face of land mud, foreign material in the mixing pile construction zone are removed and levelling of the land; reinforcing accomplishes that ground is solid smooth; perform pipeline protection before the construction; the cleaning obstruction; lay then and lead wood, mounting guide rail, installation chassis on guide rail (chassis is welded into for steel plate therebetween channel-section steel up and down); and temporary fixed, on the chassis, set up pylon.Utilize pylon to carry out the lifting of deep-mixed pile machine after the pylon assembly unit is finished, the mortar preparation system is installed is simultaneously comprised working platform, pulping equipment and pumping equipment, the mobile preparation of mortar station.Carry out pipeline connection work, carry out the machinery debugging at last.
Carry out raw-material preparation before going into operation: (A) material of all uses should meet design and GB and town-brand regulation; (B) cement must possess the outgoing certificate, tackles when stocking up to carry out an acceptance inspection in its kind, label, packing, the date of production etc., and stores by pertinent regulations; By standard sampling censorship.(C) behind the measurement unwrapping wire, survey crew provides the size that muscle is hung in welding, and welds before the lifting of H shaped steel is inserted.Hanging muscle adopts φ 8 circle muscle to get final product.(D) carry out each in accordance with regulations about raw-material sampling and test job, guarantee raw-material quality.
2) guide groove excavation
Go along with sb. to guard him center line excavation work groove according to foundation ditch 1, adopt PC200 excavator excavation, guide groove width 1.2 m, the degree of depth is 1.0 m, with beating with digging, guarantees that slurries are not excessive in the construction, the surplus soil and the waste pulp that dig out are in time handled.
3) location shaped steel is placed
The vertical guide slot direction is placed 2 location shaped steel that specification is 200mm * about 2.5m of 200mm length, makes the shaped steel locator card by the shaped steel size, deflection when preventing the shaped steel insertion.Place 2 location shaped steel in the parallel guide slots direction, specification 300 * 300mm is about 8-20m, makes 1 mark every 1.2m on shaped steel, is convenient to look in the construction stake position.
Described soil nailing wall slope protection construction also comprises the step that anchor pole was made, inserted anchor pole, slip casting and sprays the concrete surface layer.As follows:
Anchor pole is made:
Described soil nailing 7 is Φ 22 reinforced anchor bolts and Φ 48 * 3.0 steel pipe anchor tubes; It is pointed that steel pipe anchor tube one end is made stake, and be the plum blossom shape every 30-40CM on its tube wall and offer the 10-15mm aperture, and per 1500 establish 30 * 30 * 3 long 50 and are provided with the angle steel barb on its outer wall.Design pitch is 1200mm, and the M10 cement mortar is adopted in slip casting in the soil nailing hole, and soil nailing metope within the walls sprays 80 thick C20 concrete, in join Φ 6.5200 * 200 reinforced mesh.
Making should be carried out according to following program: to making the steel of anchor pole, model, specification will adhere to specification.
The body of rod should degrease, eliminate rust.The soil nailing cutting length is a design length, if the degree of depth changes, and be according to the hole depth blanking.Marker number after completing is convenient to the hand-hole of checking the number.
Soil nailing reinforcing bar spreading adopts single-selded lap joint, lap length 10d, and welded reinforcement should carry out tension test.
Insert anchor pole:
Check by designing requirement whether anchor pole is qualified, is provided with medium-height trestle according to designing requirement, Grouting Pipe is with anchor pole together in the patchhole, Grouting Pipe bottom 250～500mm at the bottom of the hole.Anchor pole is forbidden pushing by force in the propelling movement process at the bottom of the Kong Xiangkong, should extract when sending not on earth and repair Kong Houzai and send.Check whether Grouting Pipe is unimpeded after delivering to the end.
The soil nailing reinforcing bar is inserted Kong Zhongqian, to install on reinforcing bar earlier centering locating support (1.5m), with guarantee reinforcing bar be in center, position, hole and slip casting after its protective layer thickness be not less than 25mm.
Slip casting:
Grouting pump is selected the D-35 type for use, and the M10 cement mortar is adopted in slip casting in the reinforcing bar soil nailing hole.Establish steam vent during slip casting, drain air in the hole.Stopping slip casting should not be less than 0.5MPa.
Slip casting employing water/binder ratio is 0.5 cement paste in the anchor tube, and the anchoring body diameter that forms after the slip casting is not less than 12cm, and grouting amount should be less than 16Kg/m, grouting pressure 0.4-0.6MPa.
To clean up in the pipe with water under high pressure before the slip casting, the injected hole place is protected with the inverted triangle angle steel, with anti-clogging.Grouting Pipe and anchor tube adopt flexible pipe seal to adopt cloth as stop grouting plug.Stop grouting plug is set, with 0.5～1.0 meter more than at the bottom of the Grouting Pipe patchhole at aperture place.Grouting Pipe connects grouting pump, and marginal not is starched to aperture direction tube pulling, till filling with.Slurry is mended 2～3 times again in every hole after slip casting.For guaranteeing that slurry and surrounding soil combine closely, in cement paste, mix a certain amount of expansion agent.
Spray the concrete surface layer:
Anchor spray machine is selected the PZ-5 type for use, and the soil nailing wall sprays 80 thick C20 concrete pavements, in join
6.5200 * 200mm steel mesh reinforcement sprays the concrete surface layer after laying steel mesh reinforcement, adopt dry sprayig process, sprays at twice.Jet thickness is 50mm for the first time, and behind soil nailing to be set, the assembling reinforcement net sheet, the injection concrete second time is to design thickness again.
SMW worker's method stake 12 corresponding pile orders in the step (eight) are as follows:
A) pile-forming machine perching; Mobile in place according to the strict rig pile frame of determining in position, stake is confidential steady, straight and even, and with plumb bob drilling rod is carried out perpendicular positioning and observe, and to guarantee a machine verticality, is not more than 3cm with regard to bit error.
B) preparation cement paste; When deep mixer stirs sinking in advance, press water/binder ratio 1:1.5, the cement grout that cement mixed ratio 20% stirs, agitation pile adopt P32.5 level Portland cement, the back duration of mixing that at every turn feeds intake must not be less than 3min, treats before the mud jacking slurries to be poured in the aggregate bin.In cement grout, add 0.5～1.0% high efficiency water reducing agent, to reduce the clogging of cement grout in the slip casting process.And mix 1～3% swell soil, and utilize its water retention to improve the deformability of cement-soil, reduce wall crazing, the anti-permeability performance that improves the SMW wall produces effect very much.
C) stir sinking in advance; After treating the cooling water circulation normally of deep mixer, start the deep-mixed pile machine and stir, subsidence velocity is by the current monitoring table control of electrical control gear, and operating current is not more than rated current, if subsidence velocity is too slow, can be from defeated slurry system supply clear water in order to creeping into.
D) whitewashing, stirring, lifting; Pile body adopts a stirring technique, cement and undisturbed soil evenly mix and stir, sink and promote and be the whitewashing stirring, for guaranteeing that cement-soil stirs, the speed that control down brill well, promotes, rig creeps into mixing speed generally at 1m/min, promotes mixing speed generally at 1.0-1.5 m/min, repeats mixing-filling in the stake bottom.After deep mixer sinks to projected depth, open mortar pump, treat that slurries arrive mouth spray, the strict again hoisting velocity of determining by design promotes deep mixer while whitewashing.
E) shaped steel external coating anti-friction agent; Before H shaped steel inserts, on H shaped steel, be coated with last layer and isolate anti-friction agent, remove the dirt and the iron rust on H shaped steel surface before the brushing.Anti-friction agent needs to be heated to fully with electric furnace and melts, and stirs with splash bar, is coated on the H shaped steel, forbids to occur being coated with less, coating cracking peeling phenomenon.As the rainy day, the shaped steel surface moisture is dried the surface with rag earlier, again the brushing anti-friction agent.In case find coating cracking, peel off, must be with after its removing and cleaning out, brushing again.
F) will locate shaped steel and be fixed on the guide rail, and be placed in the shaped steel of location with loop wheel machine lifting shaped steel, and vertically insert in the cement paste, until projected depth along location shaped steel; After three cement mixing pile constructions finished, loop wheel machine was in place immediately, prepared to hang and inserted H shaped steel, and the location shaped steel with H shaped steel before inserting is fixed on the guide rail exactly, and the levelness of calibration equipment.Utilize pile pulling preformed hole in shaped steel top during lifting, install suspender and stay hook, be placed in the shaped steel locator card,, guarantee that shaped steel is vertical in the verticality of orthogonal 2 directions with surveyor's transit check H type with loop wheel machine lifting H shaped steel.The shaped steel locator card must be firmly, H shaped steel bottom centre will align center, stake position, and along in the vertical slowly insertion cement mixing method of the locator card body, be inserted into the design code degree of depth under the deadweight of dependence H shaped steel, if H shaped steel can't rely under the deadweight really at certain construction area and be inserted into the position, can adopt vibrating hammer to assist and put in place.When inserting H shaped steel, must after inserting, H shaped steel change hook.
G) shaped steel is fixed on the location shaped steel of laying the groove both sides, cement paste solidifies in the hole.
Described SMW worker's method stake 12: be three cement mixing pile interpolations of Φ 850mm600 H700 * 300 * 13 * 24 shaped steel, cement mixing pile adopts the construction of standard continuation mode, and joint form is that full section cover is beaten.According to each section soil property situation, the interior insertion of pile body H shaped steel length is respectively 14.0m, 15.0m, 16.5m and does not wait; H shaped steel spacing is 1200mm or 1200/600mm combination.
More than be an exemplary embodiments of the present invention, enforcement of the present invention is not limited thereto.
Claims (8)
1. a base pit stand construction is applicable to the supporting of large-scale excavation, it is characterized in that: comprehensively adopted both above combinations in SMW worker's method pile body system, inner supporting body system, concrete revetment system and the soil nailing wall bank protection system, concrete construction sequence is as follows:
(1) preparation of construction;
(2) the foundation ditch periphery possesses the foundation ditch of putting sloping condition for open area, adopts concrete revetment system or soil nailing wall bank protection system; Hole top (3) is during to the vertical distance of cheating at the end (4)＜4m, adopt the concrete revetment system, the gradient of concrete revetment (5) is 1:0.5, hole top is when cheating the straight distance 〉=4m of dolly, adopt soil nailing wall bank protection system, the gradient of bank protection is 1:0.7, and soil nailing wall bank protection system is to carry out soil nailing wall slope protection construction at concrete revetment simultaneously;
(3) be to carry out supporting foundation pit (1) position to carry out the support post pile driving construction intending adopting inner supporting body, foundation ditch periphery construction SMW worker's method stake (12);
(4) on SMW worker's method stake (12) top one coagulation fortifield village purlin (8) is set;
(5) be to carry out the supporting position to carry out basement sole plate (9) construction intending adopting inner supporting body, treat that sole plate intensity reaches after the designing requirement that the construction reinforced bar concrete supports bracket (10) on sole plate, between coagulation fortifield village purlin and steel concrete support bracket, set up oblique steel pipe and support (11), between supporting, oblique steel pipe connects with shaped steel steel connecting rod, after oblique steel pipe support system is finished, construction basement load-carrying members;
(6) the basement load-carrying members are constructed to finish and are removed oblique steel pipe support (11);
(7) backfilling of earthwork;
(8) be that SMW worker's method stake (12) construction is carried out in the foundation ditch position intending adopting SMW worker's method pile body;
(9) in the stake of SMW worker's method, insert shaped steel;
(10) treat that basement load-carrying members concrete strength reaches prescribed strength, by being arranged symmetrically in the hydraulic jack of waiting to pull out the shaped steel both sides, transfer to shaped steel, the yellow ground backfill is adopted in the slit that shaped steel stays.
2. a kind of base pit stand construction according to claim 1, it is characterized in that: the wall of soil nailing described in step 2 bank protection (6) construction is included in soil nailing wall design attitude and sprays 50mm thickness concrete pavement, makes soil nailing (7) and on soil nailing nail body the centering locating support is installed, Grouting Pipe and soil nailing (7) are together inserted in the soil nailing hole, on 50mm thickness concrete pavement, lay steel mesh reinforcement, at last sprayed mortar surface layer operation once more on the reinforcing bar wire side.
3. a kind of base pit stand construction according to claim 2 is characterized in that: described soil nailing (7) is reinforced anchor bolt and steel pipe anchor tube; It is pointed that steel pipe anchor tube one end is made stake, and have plum blossom shape aperture on its tube wall, and its outer wall is provided with the angle steel barb.
4. a kind of base pit stand construction according to claim 1 is characterized in that: the method for SMW worker described in step 8 pile driving construction order is as follows:
(a) pile-forming machine perching;
(b) preparation cement paste;
(c) stir sinking in advance;
(d) whitewashing, stirring, lifting;
(e) shaped steel external coating anti-friction agent;
(f) will locate shaped steel and be fixed on the guide rail, and be placed in the shaped steel of location with loop wheel machine lifting shaped steel, and vertically insert in the cement paste, until projected depth along location shaped steel;
(g) shaped steel is fixed on the location shaped steel of laying the groove both sides, cement paste solidifies in the hole.
5. a kind of base pit stand construction according to claim 4 is characterized in that: described shaped steel is H shaped steel; Nine laminates are set between H shaped steel and the coagulation fortifield village purlin (8) isolates.
6. according to the used device of the described base pit stand construction of claim 1, it is characterized in that: for SMW worker's method pile body system, inner supporting body system, concrete revetment system and the above system of soil nailing wall bank protection system or make up more than both, described SMW worker's method stake top is provided with coagulation fortifield village purlin, interpolation shaped steel, the slotting shaped steel equal in length of institute or do not wait in the pile body; Described inner supporting body is that oblique steel pipe supports or horizontal support, and oblique steel pipe supports an end and is supported on the coagulation fortifield village purlin, and the other end is supported on the support bracket of basement sole plate end face; Horizontal support comprises main the support and the contact support, main support and contact are supported on and form the intersecting parallels steelframe on the same horizontal plane, bottom supporting at the node of intersecting parallels steelframe has column, column lower end is supported on the stand column pile top, described soil nailing wall bank protection system is for having concrete revetment from the top, hole to the foundation ditch inboard of cheating position, the end, be covered with the steel concrete surface layer in the bank protection position, perpendicular to being inserted with soil nailing in the steel concrete surface layer foundation ditch surrounding soil.
7. according to the used device of the described base pit stand construction of claim 6, it is characterized in that: top, described concrete revetment hole is during to the vertical distance of cheating the end＜4m, and the bank protection gradient is 1:0.5, and the top, hole is to cheating the straight distance of dolly〉during 4m, the bank protection gradient is 1:0.7.
8. a base pit stand construction is applicable to the supporting of large-scale excavation, it is characterized in that: comprehensively adopted both above combinations in SMW worker's method pile body system, inner supporting body system, concrete revetment system and the soil nailing wall bank protection system, concrete construction sequence is as follows:
(1) preparation of construction;
(2) the foundation ditch periphery possesses the foundation ditch of putting sloping condition for open area, adopts concrete revetment system or soil nailing wall bank protection system; Hole top (3) is during to the vertical distance of cheating at the end (4)＜4m, adopt the concrete revetment system, the gradient of concrete revetment (5) is 1:0.5, hole top is when cheating the straight distance 〉=4m of dolly, adopt soil nailing wall bank protection system, the gradient of bank protection is 1:0.7, and soil nailing wall bank protection system is to carry out soil nailing wall slope protection construction at concrete revetment simultaneously;
(3) be to carry out supporting foundation pit (1) position to carry out the support post pile driving construction intending adopting inner supporting body, foundation ditch periphery construction SMW worker's method stake (12);
(4) on SMW worker's method stake (12) top one coagulation fortifield village purlin (8) is set;
(5) in the described coagulation of step 4 fortifield village purlin side horizontal support (2) is set, horizontal support (2) comprises main the support and the contact support, main support and contact are supported and are formed the intersecting parallels steelframe in the plane, bottom supporting at the node of intersecting parallels steelframe has column, and column lower end is supported on the stand column pile top;
(6) the basement load-carrying members are constructed to finish and are removed oblique steel pipe support (11);
(7) backfilling of earthwork;
(8) be that SMW worker's method stake (12) construction is carried out in the foundation ditch position intending adopting SMW worker's method pile body;
(9) in the stake of SMW worker's method, insert shaped steel;
(10) treat that basement load-carrying members concrete strength reaches prescribed strength, by being arranged symmetrically in the hydraulic jack of waiting to pull out the shaped steel both sides, transfer to shaped steel, the yellow ground backfill is adopted in the slit that shaped steel stays.
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| CN2010102346699A CN101892667B (en) | 2010-07-23 | 2010-07-23 | Foundation pit support device and construction method |
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| CN2010102346699A CN101892667B (en) | 2010-07-23 | 2010-07-23 | Foundation pit support device and construction method |
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| CN101892667B true CN101892667B (en) | 2011-12-21 |
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| JPH10152840A (en) * | 1996-11-21 | 1998-06-09 | Nishimatsu Constr Co Ltd | Constructing method for earth retaining timbering |
| CN1206422C (en) * | 2002-07-25 | 2005-06-15 | 上海隧道工程股份有限公司 | Technology building up diagonal space brace by reverse masonry method |
| CN101270579B (en) * | 2007-03-19 | 2010-05-19 | 上海市第一建筑有限公司 | Foundation pit guard method for expansion construction from deep foundation pit to shallow foundation pit |
| CN101463605A (en) * | 2007-12-18 | 2009-06-24 | 上海市第五建筑有限公司 | New and old enclosures combined foundation pit enclosure method |
| CN101408025B (en) * | 2008-11-11 | 2011-06-01 | 广州市设计院 | Pit construction method by using major structure as bearing point |
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