CN102330430A - Construction method for prefabricated building enclosure of deep foundation pit in low-temperature environment construction - Google Patents
Construction method for prefabricated building enclosure of deep foundation pit in low-temperature environment construction Download PDFInfo
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- CN102330430A CN102330430A CN201110200182A CN201110200182A CN102330430A CN 102330430 A CN102330430 A CN 102330430A CN 201110200182 A CN201110200182 A CN 201110200182A CN 201110200182 A CN201110200182 A CN 201110200182A CN 102330430 A CN102330430 A CN 102330430A
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Abstract
The invention relates to the construction of building enclosures of deep foundation pits, in particular to construction method for a prefabricated building enclosure of a deep foundation pit in low-temperature environment construction. The construction method comprises the following steps of: prefabricating pile sections of enclosure piles, finishing boring pile positions according to design requirements, hoisting and placing the enclosure pile sections section by section and connecting the sections into integers in field to compose prefabricated enclosure pile retaining walls; and excavating the foundation pit, and finishing constructing transversely-supported internal structures among the prefabricated enclosure pile retaining walls so as to compose the prefabricated building enclosure of the deep foundation pit. The construction method provided by the invention has the advantages that: the building enclosure of the foundation pit is made of factory prefabricated members, the in-situ binding of reinforcing steel bar and pouring and curing of concrete under subzero temperature conditions can be avoided, so that the measure cost for winter construction is saved, the working environment is improved, the work efficiency is enhanced, the site construction period is shortened, and meanwhile, the quality of poured concrete of the building enclosure can be ensured.
Description
Technical field
The present invention relates to be used for the construction of the space enclosing structure of deep foundation ditch, be specifically related to a kind of job practices that is used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature.
Background technology
In the prior art, space enclosing structure kind and job practices that deep foundation ditch is commonly used mainly contain following several kinds:
1, diaphragm wall adopts special-purpose trench equipment under mud off, to excavate deep trouth, lifts reinforcing cage, concreting then, at one concrete wall of underground formation.Diaphragm wall as the advantage of space enclosing structure is: body of wall rigidity is big, good integrity, distortion are little, have the impervious effect of dash, and the outer precipitation that do not need in hole is little to the surrounding enviroment influence.Shortcoming is: need mud off during construction, mud conditioning is complicated; Need big place, environment is caused certain influence; And the cost of diaphragm wall is higher relatively.At severe cold area, too high because slurrying, excavation grooving, reinforcing bar cage hoisting, concrete transportation such as build at the winter construction cost, this technology will not be used generally speaking.
2, colonnade formula bored pile, castinplace pile is big to the scope of application on stratum, according to the engineering hydrogeological conditions, can adopt mud off to be drilled to job practicess such as hole, impact holing, long auger, dried operation pore-forming.Filling pile construction is easy, does not need big machinery, and construction area is few, and environmental pollution is less, and operating expenses is lower.Adopt steel mesh reinforcement sprayed mortar protection inter-pile soil between the bored pile, a little less than the water blockoff ability, be higher than the end, excavation hole in groundwater table, and location that can not precipitation must establish water-stop curtain in addition, cost is higher.At severe cold area; Little because of filling pile construction facility height, occupied ground is little; Can build brooder is incubated construction equipment, mud pit, constructional materials, concrete curing etc.; Castinplace pile can be used as foundation pit enclosure structure and carries out winter construction, but construction cost is high, poor working environment, and construction quality is uneven.
3, boring interlock stake, this is the campshed of layout, the mutual interlock of adjacent single pile (embedding of stake circumference phase) thus form and can keep off steel concrete " piling wall " native, dash.Boring interlock stake geological adaptability is strong, is specially adapted to unfavorable geological conditions such as mud, quicksand, rich groundwater.The interlock stake need not mud off, has saved the expense that mud making, use, useless slurry are handled.The interlock stake is a kind of space enclosing structure technology of novelty; With the incomparable advantage of other supporting and protection structure is arranged under the condition, severe cold area can not be provided with mud pit and insulation measure in the winter time; Reduced construction costs, but still needed to take the winter to execute measure operations such as reinforcing bar binding, concrete curings.
In sum, Extra-Deep Foundation Pit structure commonly used at present mainly contains several kinds of diaphragm wall, colonnade formula bored pile, boring interlock stakes etc.Though construction technology is different, stake (wall) body is main with cast-in-situ concrete all.At particular surroundings such as severe cold area or low temperature environment; Carry out the construction of foundation ditch cast-in-situ steel reinforced concrete space enclosing structure winter; It is abominable that the ambient conditions of operations such as reinforcing bar binding, concreting, maintenance is carried out at the scene; For the minimum temperature requirement that guarantees that concrete curing needs, need take to build the winters such as brooder, constructional materials heating, concrete heat-insulating maintenance and execute measure.Construction costs is high, and speed of application is slow, and construction quality is relatively poor relatively.
Summary of the invention
The objective of the invention is weak point according to above-mentioned prior art; A kind of job practices that is used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature is provided; This job practices is applicable at severe cold area or low temperature environment; Adopt the prefabricated space enclosing structure of the prefabricated foundation ditch of batch production, be transported to and lift by crane behind the job site, connect, set up and put in place, bring into play the space enclosing structure effect at once.Avoid the deficiency that concreting, maintenance are carried out in the scene in the prior art.
The object of the invention realizes being accomplished by following technical scheme:
A kind of job practices that is used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature; It is characterized in that; Said job practices adopts following steps: the stake joint of at first prefabricated fender post; Secondly accomplish stake position pore-forming according to designing requirement, hang fender post joint and scene then piecemeal and connect into integral body, constitute prefabricated fender post barricade; Carry out excavation of foundation pit afterwards, accomplish the internal construction construction of cross binding between the prefabricated fender post barricade same period, thereby constitute the prefabricated space enclosing structure of said deep foundation ditch.
Described executing made prefabricated fender post and comprised that successively on-site hoisting, stake sections connect, all slip casting of stake.
The stake joint of described prefabricated fender post comprises head stake, pin stake and pile body stake, and described on-site hoisting refers to and on-the-spot described head stake, the stake of at least one joint pile body and pin stake lifted hand-hole successively, and described stake sections connects and carries out the same period.
Described stake sections connects the adjacent studs joint aggregate erection that is meant the lifting hand-hole and constitutes prefabricated fender post.
The all slip casting of described stake refers to described prefabricated fender post and has accomplished on-site hoisting and be connected with a sections; Behind the whole hoisted in position of prefabricated fender post; Carry out all slip casting of stake, to fill the space between preformed pile and all soil of stake, slip casting is carried out through the Grouting Pipe that is embedded in the pile body.
Described internal construction construction refers to Excavation Process, between prefabricated fender post barricade, executes successively from top to bottom and does horizontal steel support; After being excavated to bottom, executing and make base arrangement and part side wall; Execute plated construction and top board structure and sidewall structure in the work afterwards from bottom to top successively, after each structure reaches design strength, remove said steel successively and support simultaneously; Last backfill foundation ditch recovers the ground road conditions.
Be installed with steel on said prefabricated fender post barricade surface and enclose purlin, said steel encloses purlin perpendicular to the setting of prefabricated fender post barricade.
Described horizontal steel support fixation is enclosed on the purlin in steel.
Described cross binding comprises but comprises that not only steel supports, and also comprises various support system inside and outside steel concrete support, the anchor cable etc.
Advantage of the present invention is: foundation pit enclosure structure adopts the batch production prefabricated component; Can avoid on-the-spot assembling reinforcement under the subzero temperature condition, build and curing concrete; Not only practiced thrift the winter construction measure cost; And improved working environment, improved work efficiency, shorten the site operation cycle, can guarantee the concrete pouring quality of space enclosing structure simultaneously.Through adopting prefabricated space enclosing structure, under-15 ℃ and following utmost point cryogenic conditions, also can carry out the bracing of foundation pit construction, realize the production of having a rest of annual no winter of severe cold area, prolong two to three months construction periods, realize good and fast engineering construction target.Except severe cold area, prefabricated space enclosing structure also can adopt under the short situation of construction phase of project, can realize that prefabricated, the on-the-spot pore-forming operations such as (grooves) of space enclosing structure batch production carries out synchronously, reduces the concrete curing time, accelerate speed of application, but cost is higher relatively.
Description of drawings
Fig. 1 arranges sketch map for Extra-Deep Foundation Pit of the present invention structural plan;
Fig. 2 is an Extra-Deep Foundation Pit structure schematic cross section of the present invention;
Fig. 3 is construction method step one sketch map of the present invention;
Fig. 4 is construction method step two sketch mapes of the present invention;
Fig. 5 is construction method step three sketch mapes of the present invention;
Fig. 6 is construction method step four sketch mapes of the present invention;
Fig. 7 is construction method step five sketch mapes of the present invention;
Fig. 8 is construction method step six sketch mapes of the present invention.
The specific embodiment
Through embodiment characteristic of the present invention and other correlated characteristic are done further explain below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
Shown in Fig. 1-8, label 1-18 representes respectively: prefabricated fender post barricade 1, steel support 2 (2.1,2.2,2.3), steel encloses purlin 3, head stake 4, stake joint connector 5, pile body stake 6, pin stake 7, road surface 8, concrete guard wall 9, hat beam 10, ground design elevation 11, top board 12, middle plate 13, side wall 14, base plate 15, base arrangement waterproofing course 16, base plate bed course 17, prefabricated fender post 18.
What following embodiment related to is a kind of job practices that is applicable to the prefabricated space enclosing structure of deep foundation ditch of severe cold area or construction at low temperature, and the form of structure of space enclosing structure is main with preformed pile, shape such as that form of fracture can be is square, circle.The construction of the prefabricated space enclosing structure of deep foundation ditch mainly comprises operations such as a stake position pore-forming, stake joint are prefabricated, on-site hoisting, sections connection, prestressed stretch-draw, all slip casting of stake.
In order to reduce the requirement to prefabricated component mould, transportation and lifting ability, prefabricated space enclosing structure is main with preformed pile, and is segmented prefabricated.
According to the engineering hydrogeological conditions, a stake position pore-forming is divided into two types of mud off pore-forming and dry method pore-formings.At severe cold area, prefabricated space enclosing structure more is applicable to dry method pore-forming engineering, like manually digging hole, long screw auger, revolve worker's methods such as digging brill, can avoid being provided with extensive mud pit, reduces the winter and executes expense and difficulty of construction.
Prefabricated can in member processing factory, the completion of stake joint, to requirements such as space enclosing structure material grade, stake footpath, reinforcing cage patterns, it is segmented prefabricated in the workshop, to carry out batch production according to design.Precasting process comprises building materials preparation, reinforcing cage colligation, goes into flow processs such as mould, maintenance, the demoulding, test detection.For avoiding the mould kind many, the expense that increases manufacturing facilities, stake joint length can be established the standardization modulus, as 4,6, full-length such as 8m; Stake joint character also can be divided into types such as head stake 4, pile body stake, pin stake 8, and standard knot is adopted in the pile body stake, and stake 4 of adjustment head or pin stake 8 length are to adapt to designing pile length.
After the making of preformed pile joint finishes, be transported to the job site, confirm the combination of stake joint according to designing pile length; Wherein to every prefabricated fender post, select head stake 4 with pin stake 8 joint to be set respectively, the needs of engineering design absolute altitude are looked in the pile body stake; More piece can be set; Segmental hoisting is gone in the boring, connects while lifting, until design elevation.The connection of stake joint can design atlas " prestressed concrete pipe pile " form (10G409) with reference to national building standard, is divided into modes such as flange connects, is welded to connect, mechanical engagement connection.But is main because of prefabricated space enclosing structure in the present embodiment is stressed to bend, to cut, and stressed very big, and the stake joint connects must guarantee the pile body globality.
(>=800mm) prefabricated space enclosing structure, shaft load is big, can arrange post-tensioned prestressed reinforcement in the pile body, to improve the pile body stress-bearing capability, strengthens the pile body globality for major diameter.
For reducing a hoisting weight; Preformed pile can adopt the hollow cylinder body structure; Simultaneously for strengthening the preformed pile globality except that adopting connected modes such as above-mentioned flange, welding, mechanical engagement, also can in the pile body hollow part, insert shaped steel after the perfusion weak concrete with the reinforcement integral rigidity.
Behind the whole hoisted in position of stake joint, need carry out all slip casting of stake,, prevent that the face of land from excessive sedimentation taking place to fill the space between preformed pile and all soil of stake.Slip casting can be carried out through the Grouting Pipe that is embedded in the pile body.
The present embodiment construction sequence is following:
The first step: excavation shallow foundation hole, execute and make concrete guard wall 9, execute and make prefabricated fender post barricade 1 beam 10 of coming of age.The prefabricated fender post 18 that wherein constitutes prefabricated fender post barricade 1 is by head stake 4, pile body stake 6; And the installation of pin stake 7 sequential combination connects and composes; Wherein every prefabricated fender post 1 has a section header stake 4, a joint pin stake 7; Pile body stake 6 is some, and the quantity of pile body stake 6 depends on the specific requirement of foundation depth.Method of attachment can be selected welding connecting mode.
Second step: continue excavation; Design elevation place at the bottom of foundation ditch; Do steel support 2 with excavation with executing successively from top to bottom, promptly execute successively and do 2.1,2.2,2.3, the support of steel support 2 is to enclose purlin 3 through the steel that is vertically located in prefabricated fender post barricade 1 surface to be fixedly connected.The mode that is fixedly connected selects bolt to connect usually, or connected modes such as flange, supporting plate, and present embodiment is executed altogether and made three road steel and support 2.1,2.2,2.3, normally under excavation of foundation pit to the steel axis of support during 0.5m place, and Shi Zuogang support 2.
The 3rd step: lay base plate speed concrete bed course 17, lay waterproofing course 16, execute and make structure base plate 15 and support the part side wall 14 between 2.3 at structure base plate 15 and the 3rd road steel.
The 4th step: after treating that structure base plate 15 reaches design strength, remove the 3rd road steel and support 2.3, lay side wall 14 waterproofing courses, execute work plate 13 in the part side wall between the plate 13 14 and the structure in structure base plate 15 and structure.
The 5th step: after treating that plate 13 reaches design strength in side wall 14 and the structure, remove the second road steel and support 2.2, lay the side wall waterproofing course, execute work side wall 14 and structure roof 12 between plate 13 and the structure roof 12 in structure.
The 6th step: after treating that side wall 14 and structure roof 12 reach design strength, remove the first road steel and support 2.1, lay the waterproof roofing layer, the backfill foundation ditch recovers road surface 8, executes at last and does foundation ditch top building structure.
Claims (9)
1. job practices that is used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature; It is characterized in that; Said job practices adopts following steps: the stake joint of at first prefabricated fender post; Secondly accomplish stake position pore-forming according to designing requirement, hang fender post joint and scene then piecemeal and connect into integral body, constitute prefabricated fender post barricade; Carry out excavation of foundation pit afterwards, accomplish the internal construction construction of cross binding between the prefabricated fender post barricade same period, thereby constitute the prefabricated space enclosing structure of said deep foundation ditch.
2. a kind of job practices that is used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature according to claim 1, it is characterized in that described execute do that prefabricated fender post comprises successively that batch production is prefabricated, on-site hoisting, stake sections connect, all slip casting of stake.
3. a kind of job practices that is used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature according to claim 2; The stake joint that it is characterized in that described prefabricated fender post comprises head stake, pin stake and pile body stake; The described on-site hoisting scene of referring to lifts hand-hole successively with described head stake, the stake of at least one joint pile body and pin stake, and the connection of described stake sections is carried out the same period.
4. according to claim 2 or 3 described a kind of job practicess that are used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature, it is characterized in that described stake sections connects the adjacent studs joint aggregate erection that is meant the lifting hand-hole and constitutes prefabricated fender post.
5. a kind of job practices that is used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature according to claim 2; It is characterized in that all slip casting of described stake refers to described prefabricated fender post and accomplished on-site hoisting and be connected with a sections; Behind the whole hoisted in position of prefabricated fender post; Carry out all slip casting of stake, to fill the space between preformed pile and all soil of stake, slip casting is carried out through the Grouting Pipe that is embedded in the pile body.
6. a kind of job practices that is used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature according to claim 1; It is characterized in that; Described internal construction construction refers to Excavation Process, between prefabricated fender post barricade, executes successively from top to bottom and makes cross binding; After being excavated to bottom, executing and make base arrangement and part side wall; Execute plated construction and top board structure and sidewall structure in the work afterwards from bottom to top successively, after each structure reaches design strength, remove said steel successively and support simultaneously; Last backfill foundation ditch recovers the ground road conditions.
7. a kind of job practices that is used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature according to claim 6; It is characterized in that; Be installed with steel on said prefabricated fender post barricade surface and enclose purlin, said steel encloses purlin perpendicular to the setting of prefabricated fender post barricade.
8. a kind of job practices that is used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature according to claim 6 is characterized in that described cross binding is fixed in steel and encloses on the purlin.
9. a kind of job practices that is used for the prefabricated space enclosing structure of deep foundation ditch of construction at low temperature according to claim 6 is characterized in that, described cross binding is that steel supports or steel concrete supports or anchor cable.
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| CN201110200182A CN102330430A (en) | 2011-07-18 | 2011-07-18 | Construction method for prefabricated building enclosure of deep foundation pit in low-temperature environment construction |
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| CN201110200182A CN102330430A (en) | 2011-07-18 | 2011-07-18 | Construction method for prefabricated building enclosure of deep foundation pit in low-temperature environment construction |
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Cited By (4)
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| CN107023016A (en) * | 2016-02-01 | 2017-08-08 | 上海城地建设股份有限公司 | Two walls unification foundation pit system is worn under a kind of road and its along the practice |
| CN109183805A (en) * | 2018-08-30 | 2019-01-11 | 广州地铁设计研究院股份有限公司 | A kind of prefabricated foundation pit enclosure system and its construction method |
| CN110409461A (en) * | 2019-08-09 | 2019-11-05 | 广州市建筑科学研究院有限公司 | A kind of base pit stand construction based on assembled large-diameter tubular pile |
| CN111576459A (en) * | 2020-05-08 | 2020-08-25 | 广州金辉建设集团有限公司 | Deep foundation pit dewatering environment-friendly and energy-saving construction process |
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| CN111576459A (en) * | 2020-05-08 | 2020-08-25 | 广州金辉建设集团有限公司 | Deep foundation pit dewatering environment-friendly and energy-saving construction process |
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Application publication date: 20120125 |