CN105804091B - Prestressing combination type steel support and earth excavation coordinative construction engineering method in deep basal pit - Google Patents
Prestressing combination type steel support and earth excavation coordinative construction engineering method in deep basal pit Download PDFInfo
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- CN105804091B CN105804091B CN201610243152.3A CN201610243152A CN105804091B CN 105804091 B CN105804091 B CN 105804091B CN 201610243152 A CN201610243152 A CN 201610243152A CN 105804091 B CN105804091 B CN 105804091B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
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Abstract
The invention discloses prestressing combination type steel support in deep basal pit and earth excavation coordinative construction engineering method, include the following steps: that (a) retaining design is constructed；(b) capping beam is constructed；(c) first of fashioned iron purlin installation；(d) earthwork of first segment first layer starts to excavate；(e) the horizontally-supported installation of first of fashioned iron；(f) the horizontally-supported lower zone earth excavation of first of fashioned iron；(g) cooperation of second and following fashioned iron horizontally-supported installation and earth excavation；(h) earth excavation finishes up.The present invention is according to staged and layered bench cut method, utilize the ability of the soil body itself resistance to deformation passive in hole, the carry out earth excavation construction of energy continuous and effective at the regional level, prestressing combination Steel section member is as the progress of earth excavation is followed by installed and applies prestressing force simultaneously, it improves the whole of Deep Foundation Pit Excavation and excavates efficiency, it ensures deep pit monitor and has saved the construction period, with good economic efficiency and social benefit.
Description
Technical field
The invention belongs to base pit engineering technical fields, and in particular to prestressing combination type steel support is opened with the earthwork in deep basal pit
Dig coordinative construction engineering method.
Background technique
A kind of support system of the prestressing combination type steel support as efficient green, is increasingly used in
It is convenient and efficient with installing and removing relative to traditional reinforced concrete support system in various deep-foundation pit engineerings, that is, it fills
It uses, without maintenance, saves the duration；And noiseless and waste residue generates when installation and dismounting, repeats back after profile use
It receives and utilizes, be conducive to environmental protection and energy-saving and emission-reduction.
In conventional steel bar concrete support deep basal pit, curing strength reaches design requirement after concrete support is constructed
When value, lower road soil can be just excavated, does not have intersection in Construction of Supporting and earth excavation technique.
Summary of the invention
Above-mentioned technical problem present in present invention aims to solve the prior art provides prestressing combination in deep basal pit
Type steel support and earth excavation coordinative construction engineering method, support installation and earth excavation are alternately worked continuously, are improved efficiency, it is ensured that
It deep pit monitor and has saved the construction period, with good economic efficiency and social benefit.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme:
Prestressing combination type steel support and earth excavation coordinative construction engineering method in deep basal pit, it is characterised in that including walking as follows
It is rapid:
(a) retaining design is constructed；
(b) capping beam is constructed: can be carried out capping beam construction after retaining design construction is finished and conserved in place, beared down on one
Before beam construction, the bracket of first installation carrying fashioned iron purlin, the interpolation section steel flange of bracket and retaining design is welded and fixed, by fashioned iron
Purlin is lifted on bracket, then the part covering thin film for also serving as side form to fashioned iron purlin is isolated, then by pre-buried spiral shell
Bolt is mounted in fashioned iron purlin and tightens fixation, then carries out beam forms installation of bearing down on one, then continuous placing capping beam in a template
The pre-embedded bolt being arranged in fashioned iron purlin is then anchored into capping beam, is then conserved to capping beam by concrete；
(c) first of fashioned iron purlin installation: the earthwork, T-type force transmission element and retaining design first at excavation fashioned iron purlin waist rail
Interpolation section steel flange be welded and fixed, while the interpolation section steel flange of bracket and retaining design is welded and fixed, fashioned iron purlin with enclose
The interpolation fashioned iron of watch box system is connected using T-type force transmission element, then pours the filling plain concrete in T-type force transmission element gap, and by T-type
It is connected between force transmission element and fashioned iron purlin using high-strength bolt, is connected between fashioned iron purlin and fashioned iron purlin using high-strength bolt；
(d) earthwork of first segment first layer starts to excavate: earth excavation follows layer and section excavation, and section length is according to scene
Situation is divided by 15m-30m, lift height 1.0m-1.5m, and a ramp is arranged in hole, and ramp is arranged in excavation of foundation pit
Middle face position, excavates ramp using digging machine first, and ramp two sides remaining soils width is not less than the 1.5 of excavation of foundation pit depth
Times, hill gradient is arranged according to 1:7, width 5-6m, is then laid with pool slag on surface, then pushes away in ramp with earth excavation level
Into；
(e) the horizontally-supported installation of first of fashioned iron: earth excavation is in place and fashioned iron purlin starts mount type after the installation is completed
Steel is horizontally-supported, fashioned iron is horizontally supported on ground carries out preassembling first, the horizontally-supported both ends center line of splice type steel
Bracket is then arranged within ± 2 ㎜ in Eccentricity control on fashioned iron column, then horizontally-supported to fashioned iron to lift, and hangs
Point from end 0.2L at, and be installed to fashioned iron is horizontally-supported on bracket, and apply prestressing force；
(f) the horizontally-supported lower zone earth excavation of first of fashioned iron: fashioned iron is horizontally-supported after the installation is completed, is dug using drawing
Method excavate the horizontally-supported underface region of fashioned iron and reserve the earthwork, earth moving vehicles pass through hole under muck haulage ramp directly draw it is native；
(g) cooperation of second and following fashioned iron horizontally-supported installation and earth excavation: the first layer earthwork is along unearthed direction
It is lasting to promote, with the expansion of working face, the horizontally-supported place's earth excavation of second fashioned iron is carried out, the second layer earthwork starts to dig
Soil, and promoted along unearthed direction, then carry out the installation of second fashioned iron purlin, the installation of second fashioned iron purlin and first of fashioned iron
Purlin installation is identical, then carries out the horizontally-supported installation of second fashioned iron, the horizontally-supported installation of second fashioned iron and first of fashioned iron
Horizontally-supported installation is identical, then carries out the horizontally-supported lower zone earth excavation of second fashioned iron, second fashioned iron level branch
It is identical as the horizontally-supported lower zone earth excavation of first of fashioned iron to support lower zone earth excavation, then carries out third road fashioned iron
Horizontally-supported place's earth excavation, the third layer earthwork start to excavate, and so on until cutting the earth to designed elevation, ramp with excavate into
It spends to unearthed direction and extends；
(h) earth excavation finishes up: digging machine transports earthwork entrucking outside hole, then will cheat interior digging machine and hang out.
Further, in step (a), retaining design is gone along with sb. to guard him using 850mm thickness TRD engineering method, and selection H700 × 300 × 13 ×
24 interpolation fashioned iron.
Further, in step (b) and step (c), bracket is made using 90 × 90 × 10 angle steel, and 1.8 meters of spacing.
Further, in step (b), fashioned iron purlin is with the lifting paragraph by paragraph of support erection sequence, using hand fit's loop wheel machine by type
Steel purlin is placed on bracket.
Further, in step (d), boundary top of the slope is excavated using the horizontally-supported side 2m distance of fashioned iron as boundary, bottom of slope is with second
The horizontally-supported bottom absolute altitude of channel type steel is boundary, and the excavation slope slope gradient adjusts between 1:1-1:2 according to soil condition.
Further, in step (e), the elevation difference after the horizontally-supported both ends installation of fashioned iron is in place is not more than 20 ㎜, and not
Greater than the 1/600 of the horizontally-supported length of entire fashioned iron, the horizontally-supported whole deflection degree control of fashioned iron is not more than the 1/1000 of span.
The present invention is by adopting the above-described technical solution, have the advantages that
1, the present invention carries out the local earthwork before support not yet forms and digs according to the excavation based on space of base pit engineering
Soil, the characteristic of fast-type and instant efficiency in conjunction with the construction of prestressing combination type steel support, installs when excavating, has higher
Earth excavation efficiency.
2, the present invention, which solves prestressing combination type steel support in most cases and constructs, is connected operation with earth excavation
Problem, realizes support installation and earth excavation is alternately worked continuously, and improves efficiency, saves the duration.
3, the present invention has used staged shoveling method, and staged and layered is cut the earth, and is conducive to the deformation in Excavation Process
Control, it is ensured that the safety of foundation pit.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings:
Structural schematic diagram when Fig. 1 is capping beam construction in the present invention；
Fig. 2 is structural schematic diagram when Shaped Steel purlin of the present invention is constructed；
Structural schematic diagram when Fig. 3 is ramp construction in the present invention
Structural schematic diagram when Fig. 4 is earth excavation construction in the present invention；
Structural schematic diagram when Fig. 5 is Shaped Steel of the present invention horizontally-supported construction；
Fig. 6 is the sectional view in ramp in the present invention；
Fig. 7 is the medium-sized bracing members installation of the present invention and structural schematic diagram when earth excavation；
Fig. 8 is the flow chart element of prestressing combination type steel support and earth excavation coordinative construction engineering method in deep basal pit of the present invention
Figure.
Specific embodiment
The scope of application of the invention: suitable for the large and medium-sized depth using one or multi-channel prestressing combination bracing members system
The earth excavation of base pit engineering.
See Table 1 for details for the main mechanical that the present invention uses
| Serial number | Device name | Specifications and models | Unit | Quantity |
| 1 | Digging machine | PC250 | Platform | 4 |
| 2 | Digging machine | PC120 | Platform | 2 |
| 3 | Loop wheel machine | KR250-25t | Platform | 1 |
| 4 | Flat car | 12 meters | Platform | 1 |
| 5 | Hydraulic jack | 300T | Platform | 3 |
| 6 | Air compressor machine | 1m3 | Platform | 10 |
| 7 | Earthwork transportation vehicle | 20t | Platform | 20 |
| 8 | Long-armed digging machine | - | - | - |
| 9 | Automatic flushing apparatus | - | - | - |
| 10 | Arrange precipitation apparatus | - | - | According to foundation pit needs |
Table 1
It as shown in Figures 1 to 8, is prestressing combination type steel support in deep basal pit of the present invention and earth excavation coordinative construction work
Method, this engineering method utilize the tau-effect of soil mass of foundation pit, according to staged and layered bench cut method, certainly using the soil body passive in hole
The ability of body resistance to deformation, the carry out earthwork of energy continuous and effective is opened in the state of interior horizontally-supported not yet molding at the regional level
Excavation construction, at the same time prestressing combination Steel section member (including purlin, bracket, supporting beam etc.) with the carry out of earth excavation it is tight
With followed by installing and applying prestressing force, forms a step type and continuously constructs circulation toward the alternating that soil outlet level promotes,
It improves the whole of Deep Foundation Pit Excavation and excavates efficiency.
The invention mainly comprises the following steps:
(a) retaining design is constructed: retaining design is gone along with sb. to guard him using 850mm thickness TRD engineering method, selects H700 × 300 × 13 × 24
Interpolation fashioned iron 2.Retaining design construction can start to carry out the beam structure construction that bears down on one after finishing and conserving in place.
(b) capping beam is constructed: can be carried out capping beam 1 after retaining design construction is finished and conserved in place and be constructed, press
Before top beam 1 is constructed, the bracket 3 of first installation carrying fashioned iron purlin, bracket 3 is made using 90 × 90 × 10 angle steel, spacing 1.8
Rice, bracket 3 and the edge of a wing of the interpolation fashioned iron 2 of retaining design are welded and fixed.Fashioned iron purlin 5 is placed using hand fit's loop wheel machine
In on bracket 3, the part covering thin film for then also serving as side form to fashioned iron purlin is isolated, convenient to remove in the future.Then
Pre-embedded bolt 4 is mounted in fashioned iron purlin 5 and is tightened fixation, then carries out the installation of 1 template of capping beam, then is continuous in a template
Capping beam concrete is poured, then anchors into the pre-embedded bolt 4 being arranged in fashioned iron purlin 5 in capping beam 1, guarantees pre-embedded bolt
Then 4 merging precisions conserve capping beam 1.
Pit earthwork must satisfy capping beam 1 before excavating all construction is completed and is conserved in place.
(c) first of fashioned iron purlin installation: the earthwork, T-type force transmission element 6 and fender body first at excavation 5 waist rail of fashioned iron purlin
2 edge of a wing of interpolation fashioned iron of system is welded and fixed, while bracket 3 and 2 edge of a wing of interpolation fashioned iron of retaining design are welded and fixed, and bracket 3 is adopted
It is made with 90 × 90 × 10 angle steel, 1.8 meters of spacing.Installation fashioned iron purlin 5 follows the original of " short after first growing, to reduce piece-ups "
Then, longer fashioned iron purlin 5, such as the standard knot component of 12m are used, preferentially to reduce piece-ups.Fashioned iron purlin 5 is set up with support
Fashioned iron purlin 5, is placed on bracket 3 by sequence lifting paragraph by paragraph using hand fit's loop wheel machine.Fashioned iron purlin 5 is interior with retaining design
It inserts fashioned iron 2 to be connected using T-type force transmission element 6, then pours the filling C20 plain concrete in 6 gap of T-type force transmission element, and by T-type power transmission
It is connected between part 6 and fashioned iron purlin 5 using high-strength bolt 7, is connected between fashioned iron purlin 5 and fashioned iron purlin 5 using high-strength bolt 7
It connects.
(d) earthwork of first segment first layer starts to excavate: before first segment first layer earth excavation, must complete excavation section and bear down on one
Beam 1, shape steel diagonal supporting and fashioned iron purlin 5 are installed, and 5 installation length of fashioned iron purlin is determined according to practical segmentation distance of excavating, general more
It is segmented the length of one purlin standard paragraphs (12m) of distance out.
Earth excavation follows layer and section excavation, and section length is divided by 15m-30m according to field condition, and layering is thick
Spend 1.0m-1.5m.One main vehicle of setting transports ramp in hole, is preferably selected in excavation of foundation pit Middle face position, and ramp must be preferential
It excavates, not influence the normal muck haulage of vehicle when subsequent support installation.Ramp 9 is excavated using digging machine 8 first, 9 two sides of ramp are pre-
Soil body width is stayed not to be preferably less than 1.5 times of excavation of foundation pit depth, 9 gradient of ramp is arranged according to 1:7, width 5-6m, and surface is laid with
Pool slag reinforcement processing, prevents vehicle from falling into vehicle.Boundary top of the slope is excavated using the horizontally-supported side 2m distance of fashioned iron as boundary, bottom of slope is with second
The horizontally-supported bottom absolute altitude of fashioned iron is boundary, and the excavation slope slope gradient adjusts between 1:1-1:2 according to soil condition.Then by ramp
9 promote with earth excavation level, and ramp 9 constantly extends and changes with horizontal promote of earth excavation, and width and the gradient are kept
Constant, the surface layer absolute altitude in ramp 9 must satisfy the vehicle primary demand current from the horizontally-supported lower section of fashioned iron.
(e) the horizontally-supported installation of first of fashioned iron: earth excavation is in place and fashioned iron purlin 5 starts mount type after the installation is completed
Steel horizontally-supported 10.Fashioned iron horizontally-supported 10 is subjected to preassembling on the ground first, in horizontally-supported 10 both ends of splice type steel
The Eccentricity control of heart line is within ± 2 ㎜.Bracket is then set on fashioned iron column, and the installation of bracket must be strictly controlled it
Verticality and horizontal absolute altitude.Then using two o'clock or 4 points of liftings when horizontally-supported to fashioned iron 10 installation, suspension centre is from end 0.2L
Place, and fashioned iron horizontally-supported 10 is installed on bracket, and apply prestressing force.After the horizontally-supported 10 both ends installation of fashioned iron is in place
Elevation difference is not more than 20 ㎜, and is not more than the 1/600 of horizontally-supported 10 length of entire fashioned iron, the whole flexure of fashioned iron horizontally-supported 10
Degree control is not more than the 1/1000 of span.Horizontal axis deviation is not more than 30mm, must ensure to reach design with the angle of purlin
It is required that avoiding causing unstability because eccentric excessive.
In horizontally-supported 10 installation of fashioned iron it should be noted that ramp 9 of being unearthed passes through the soil of horizontally-supported 10 lower zone of fashioned iron
Side must advanced excavation, when excavation must assure that the reserved earthwork not less than 1.5 times of excavation of foundation pit depth widths in 9 two sides of ramp, benefit
With the ability of the soil body itself resistance to deformation, the characteristic for cooperating prestressing force fashioned iron quick and easy for installation quickly completes in 12 hours
The installation and prestressed application of fashioned iron horizontally-supported 10.
(f) the horizontally-supported lower zone earth excavation of first of fashioned iron: fashioned iron horizontally-supported 10 after the installation is completed, using drawing
The method of digging excavates fashioned iron horizontally-supported 10 underface region and reserves the earthwork, and earth moving vehicles are directly drawn by the lower hole in muck haulage ramp 9
Soil.When the earthwork is cut the earth in cheating, Ying Youxian excavates the earthwork closed at retaining design side fashioned iron purlin 5, so as to the installation of fashioned iron purlin 5
It is simultaneously advanced with earth excavation, it is ensured that the subsequent smoothly installation of fashioned iron horizontally-supported 10.
(g) cooperation of second and following fashioned iron horizontally-supported installation and earth excavation: the first layer earthwork is along unearthed direction
It is lasting to promote, with the expansion of working face, the horizontally-supported place's earth excavation of second fashioned iron is carried out, the second layer earthwork starts to dig
Soil, and promoted along unearthed direction, then carry out the installation of second fashioned iron purlin, the installation of second fashioned iron purlin and first of fashioned iron
Purlin installation is identical, then carries out the horizontally-supported installation of second fashioned iron, the horizontally-supported installation of second fashioned iron and first of fashioned iron
Horizontally-supported installation is identical, then carries out the horizontally-supported lower zone earth excavation of second fashioned iron, second fashioned iron level branch
It is identical as the horizontally-supported lower zone earth excavation of first of fashioned iron to support lower zone earth excavation, then carries out third road fashioned iron
Horizontally-supported place's earth excavation, the third layer earthwork start to excavate, and so on until cutting the earth to designed elevation, ramp with excavate into
It spends to unearthed direction and extends.In the progradation of earth excavation, excavating and install in advance for purlin beam is remained, it is horizontally-supported
The subsequent follow-up of beam installs and applies prestressing force, the excavation process followed by earth excavation.Muck haulage ramp is main as what is be unearthed
Channel constantly as the vertical of earth excavation is deeply changed with horizontal propulsion, therefore must carry out opening in time for channel
It digs and modifies, it is ensured that the earthwork can be transported sequentially.
(h) earth excavation finishes up: when excavation of foundation pit depth is deeper, and the ramp distance of muck haulage not enough causes the gradient bigger than normal,
It digging machine preferably can be used turns over and be transported to the elevation range that ramp can reach, then by digging machine earthwork entrucking to be transported hole outer.The oral area that is unearthed is cheated
The long-armed digging machine of tradition is pressed in the interior remaining earthwork or grab bucket is completed, then will be cheated interior digging machine and be hung out.
Quality control of the present invention:
1, pit earthwork should work out special construction plan and implementable through each side's examination & approval rear before excavating, more than 5 meters of depths
Foundation pit could be implemented after also needing organizes expert demonstration to agree to.It should be understood that block division, the earth excavation of earth excavation are suitable in scheme
Situations such as sequence, the quantity required of various types of materials machinery, operating personnel's quantity.
2, detailed construction schedule should be worked out, the installation of each component of reasonable arrangement fashioned iron horizontally-supported 10 is opened with the earthwork
The sequencing of digging, the technique linking in reasonable arrangement work progress, it is ensured that construction it is smooth into.
3, palpus thorough cleaning connecting portion (such as built-in fitting, H profile steel) is no less than 200 × 200mm range before bracket welding
The sundries such as interior iron rust, greasy dirt, concrete residue.The steel corbel welded must guarantee that connecting portion is solid and reliable at three, have enough
Stability, there is not allowed that twisted, rosin joint phenomenon, weld bead height is not less than 8 ㎜；Whippletree horizontal gradient error will control within 2 ㎜
And its elevation angle should control >=90 degree, and must not exceed 95 degree.
4, purlin installation requirement misalignment of axe must not exceed ± 20mm, and the unilateral position line of purlin need to meet one on the inside of foundation pit
This basic demand of straight line, it is ensured that outside building enclosure applies uniform force after prestressing force.
5, the horizontal absolute altitude error of the installation of bracket part must not exceed ± 5MM；And strict control verticality is answered, if stand column pile is sent out
Raw deviation, can reach vertical requirement by cushioning steel plate.The installation direction that column connect bolt with bracket needs to keep one
It causes.It is firm that bracket part after installation must be fastened with fashioned iron stand column pile, and the torque of frictional high-strength bolts need to reach prescribed requirement.
6, earth excavation follows the requirement of layering, excavation section by section.During stairstepping excavates horizontal promote, every layer of platform
The earthwork at fashioned iron purlin is preferentially excavated when terrace layer absolute altitude earth excavation, and purlin is installed, and purlin installation length is generally to be more than
One standard knot length (12m) of section length；The length of segmentation is not greater than the length between type steel support, the depth disposably excavated
It spends according to different soil property depth differences, it must not large area ultra-deep excavation before type steel support does not complete installation and construction prestressing force.
7, during earth excavation, digging machine is forbidden to touch any prestressing force Steel section member, stand column pile periphery 1m range
The interior earthwork is excavated using hand fit.
8, the segmentation is preferably completed after being excavated in the horizontally-supported installation exercise face of the fashioned iron of each segmentation in 24 hours
The horizontally-supported installation of domain type steel.
Other points for attention of the invention:
1, fashioned iron is horizontally-supported construction is opened to the earthwork before should carry out the pre-job training of related operating personnel and confide a technological secret.
2, the transport that material is paid attention in construction, avoids damaging Steel section member itself.Placing of material place should carry out
It is smooth and harden, it carries out and shelves platform；If should be covered for a long time in air storage.
3, the welding quality of each connecting elements is paid attention in construction, it is necessary to reach relevant criterion requirement.
4, the absolute altitude of the horizontally-supported all kinds of built-in fittings of strict control fashioned iron and connector, verticality and levelness is accurate
Degree, and part of having completed is checked according to acceptance procedures, problematic place is rectified and improved in time.
Safety measure of the present invention:
1, related labor safety laws and regulations requirement is strictly observed, tells somebody what one's real intentions are safely before reinforcing construction safety education and class, strictly holds
The every safety in production rules and regulations of row.
2, the cable of distribution box should have casing, and electric wire disengaging is not chaotic.Lighting lead application insulator is fixed.Forbid to make
With yarn or plastics gummed wire.Strictly observe the requirement that the leakage of one lock one of a machine is protected.
3, fire danger sign is set by prescribed requirement, is equipped with enough fire distinguishers, and pacify in the range of having welding operation
Row special messenger sees fire, strictly observes construction and gets angry examination and approval system.
4, enough illuminations should be had by carrying on construction work at night, and paste reflective strip on fashioned iron column to prevent touching.
5, control is required to stay native grade of side slope in strict accordance with scheme when excavating.
Environmental protection measure of the present invention:
1, work progress should strictly observe the relevant laws and regulations of country, local environment protection, should adopt an effective measure, really
Site operation fugitive dust is protected, noise, scrap iron, waste residue etc. are rationally disposed.
2, reasonable arrangement Steel section member is stacked place and processing site, place and should be hardened, and material should be stacked neatly, divide door other
Class.Machining shed should require to be set up according to civilized construction and safe construction.
3, machining shed should carry out sound insulation and noise reduction measure, and electric welding field should avoid carrying on construction work at night as far as possible, reduce light pollution.
4, dumper prevents the earthwork in transportational process from spilling using there is top cap type, and vehicle must carry out cleaning before appearing on the scene dry
Only.
5, construction site and installer living area arrange special messenger to be responsible for cleaning health, and life draws rubbish to clear in time, reduce
Destruction to surrounding enviroment.
Performance analysis of the present invention:
1, engineering method simple process, earthwork energy continuity construction, can effectively improve earth excavation efficiency, reduce the earthwork
The excavation construction period saves the duration.
2, prestressing force fashioned iron horizontal struts system rigidity is big, is quickly and expediently installed, and can play a role rapidly after installation, the earthwork
Layered excavation section by section is excavated, the horizontally-supported coordinative construction of fashioned iron greatly reduces the exposure duration of foundation pit unstable state, is promoted
The safety of foundation pit during earth excavation.
3, prestressing force type steel support uses Virtual production, and the noise generated when recycling, installation and dismounting can be recycled
It is small, and to environment without any pollution, be conducive to promote effects of energy saving and emission reduction.
4, the present invention provides application example for such engineering, can be used as important reference frame, has good push away
Wide value.
The above is only specific embodiments of the present invention, but technical characteristic of the invention is not limited thereto.It is any with this hair
Based on bright, to solve essentially identical technical problem, essentially identical technical effect is realized, made simple change, etc.
With replacement or modification etc., all it is covered by among protection scope of the present invention.
Claims (6)
1. prestressing combination type steel support and earth excavation coordinative construction engineering method in deep basal pit, it is characterised in that including walking as follows
It is rapid:
(a) retaining design is constructed；
(b) capping beam is constructed: can be carried out capping beam construction after retaining design construction is finished and conserved in place, be applied in capping beam
Before work, the bracket of first installation carrying fashioned iron purlin, the interpolation section steel flange of bracket and retaining design is welded and fixed, by fashioned iron purlin
It is lifted on bracket, then the part covering thin film for also serving as side form to fashioned iron purlin is isolated, and then pacifies pre-embedded bolt
In fashioned iron purlin and fixation is tightened, then carries out beam forms installation of bearing down on one, then continuous placing capping beam coagulation in a template
The pre-embedded bolt being arranged in fashioned iron purlin is then anchored into capping beam, is then conserved to capping beam by soil；
(c) first fashioned iron purlin installation: first at excavation fashioned iron purlin waist rail cubic metre of earth, T-type force transmission element and retaining design it is interior
Slotting section steel flange is welded and fixed, while the interpolation section steel flange of bracket and retaining design is welded and fixed, fashioned iron purlin and fender body
The interpolation fashioned iron of system is connected using T-type force transmission element, then pours the filling plain concrete in T-type force transmission element gap, and by T-type power transmission
It is connected between part and fashioned iron purlin using high-strength bolt, is connected between fashioned iron purlin and fashioned iron purlin using high-strength bolt；
(d) earthwork of first segment first layer starts to excavate: earth excavation follows layer and section excavation, and section length is according to field condition
It is divided by 15m-30m, lift height 1.0m-1.5m, a ramp is set in hole, ramp is arranged in excavation of foundation pit face
Portion position, excavates ramp using digging machine first, and ramp two sides remaining soils width is not less than 1.5 times of excavation of foundation pit depth, slope
The road gradient is arranged according to 1:7, width 5-6m, is then laid with pool slag on surface, then promotes in ramp with earth excavation level；
(e) the horizontally-supported installation of first of fashioned iron: earth excavation is in place and fashioned iron purlin starts mount type molten steel after the installation is completed
Fashioned iron, is horizontally supported on ground carries out preassembling first by flat support, the bias of the horizontally-supported both ends center line of splice type steel
Degree control within ± 2 ㎜, bracket is then set on fashioned iron column, it is then horizontally-supported to fashioned iron to lift, suspension centre from
At the 0.2L of end, and it is installed to fashioned iron is horizontally-supported on bracket, and apply prestressing force；
(f) the horizontally-supported lower zone earth excavation of first of fashioned iron: fashioned iron is horizontally-supported after the installation is completed, using the side for drawing digging
Method excavates the horizontally-supported underface region of fashioned iron and reserves the earthwork, and earth moving vehicles pass through hole under muck haulage ramp and directly draw soil；
(g) cooperation of second and following fashioned iron horizontally-supported installation and earth excavation: the first layer earthwork continues along unearthed direction
It promoting, with the expansion of working face, carries out the horizontally-supported place's earth excavation of second fashioned iron, the second layer earthwork starts to cut the earth, and
Along being unearthed, direction is promoted, and then carries out the installation of second fashioned iron purlin, the installation of second fashioned iron purlin and first of fashioned iron purlin
It installs identical, then carries out the horizontally-supported installation of second fashioned iron, the horizontally-supported installation of second fashioned iron and first of fashioned iron are horizontal
Support installation is identical, the horizontally-supported lower zone earth excavation of second fashioned iron is then carried out, under second fashioned iron is horizontally-supported
Square regional earthwork excavation is identical as the horizontally-supported lower zone earth excavation of first of fashioned iron, and it is flat then to carry out third channel type molten steel
Earth excavation at support, the third layer earthwork start to excavate, and so on until cutting the earth to designed elevation, ramp with the progress of excavation to
Unearthed direction extends；
(h) earth excavation finishes up: digging machine transports earthwork entrucking outside hole, then will cheat interior digging machine and hang out.
2. prestressing combination type steel support and earth excavation coordinative construction engineering method in deep basal pit according to claim 1,
Be characterized in that: in step (a), the retaining design is gone along with sb. to guard him using 850mm thickness TRD engineering method, selects H700 × 300 × 13 × 24
Interpolation fashioned iron.
3. prestressing combination type steel support and earth excavation coordinative construction engineering method in deep basal pit according to claim 1,
Be characterized in that: in step (b) and step (c), the bracket is made using 90 × 90 × 10 angle steel, and 1.8 meters of spacing.
4. prestressing combination type steel support and earth excavation coordinative construction engineering method in deep basal pit according to claim 1,
Be characterized in that: in step (b), the fashioned iron purlin, will be described using hand fit's loop wheel machine with the lifting paragraph by paragraph of support erection sequence
Fashioned iron purlin is placed on bracket.
5. prestressing combination type steel support and earth excavation coordinative construction engineering method in deep basal pit according to claim 1,
It is characterized in that: in step (d), excavating boundary top of the slope using the horizontally-supported side 2m distance of fashioned iron as boundary, bottom of slope is with second fashioned iron
Horizontally-supported bottom absolute altitude is boundary, and the excavation slope slope gradient adjusts between 1:1-1:2 according to soil condition.
6. prestressing combination type steel support and earth excavation coordinative construction engineering method in deep basal pit according to claim 1,
Be characterized in that: in step (e), the elevation difference after the horizontally-supported both ends installation of fashioned iron is in place is not more than 20 ㎜, and less
In the 1/600 of the entire horizontally-supported length of fashioned iron, the horizontally-supported whole deflection degree control of the fashioned iron is no more than span
1/1000。
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| CN106567394A (en) * | 2016-11-14 | 2017-04-19 | 杭州天和建设集团有限公司 | Water-stop PC steel pipe pile and inner pre-stressed section steel support combined supporting construction method |
| CN108677963B (en) * | 2018-05-23 | 2024-06-21 | 中铁第四勘察设计院集团有限公司 | Steel support stay joint structure for foundation pit engineering and construction method thereof |
| CN108951647A (en) * | 2018-07-18 | 2018-12-07 | 中铁十二局集团第二工程有限公司 | Construction method for supporting is excavated in hole in the hole of open trench tunnel |
| JP7174548B2 (en) * | 2018-07-19 | 2022-11-17 | 戸田建設株式会社 | Mountain retaining structure, axial force transmission device, and installation method for mountain retaining structure |
| CN109837907B (en) * | 2019-01-24 | 2020-08-21 | 中国建筑第八工程局有限公司 | Foundation pit excavation construction method |
| CN110485429A (en) * | 2019-03-21 | 2019-11-22 | 安徽省第一建筑工程有限公司 | A kind of prestressing force fashioned iron assembled combination inner support construction method |
| CN112609706B (en) * | 2020-12-09 | 2022-05-17 | 中铁二十局集团第六工程有限公司 | Construction method of opposite-bracing angle brace concrete horizontal supporting structure of foundation pit in sea reclamation area |
| CN112575793B (en) * | 2020-12-17 | 2024-08-09 | 中铁二十二局集团轨道工程有限公司 | Open cut foundation pit continuous beam capable of being quickly installed with steel support |
| CN113550319A (en) * | 2021-06-24 | 2021-10-26 | 中铁四局集团有限公司 | Foundation pit construction method based on micro-disturbance construction method pile |
| CN114645544B (en) * | 2022-02-28 | 2024-01-16 | 上海巨鲲科技有限公司 | Construction method for post-loading beam string of foundation pit |
| CN115305927A (en) * | 2022-09-07 | 2022-11-08 | 中建八局第三建设有限公司 | Construction method for splicing concrete support and IPS support |
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