CN105735344A - Circle ground pit lining wall steel bar colligation support and lining wall reverse building method - Google Patents
Circle ground pit lining wall steel bar colligation support and lining wall reverse building method Download PDFInfo
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- CN105735344A CN105735344A CN201410739205.1A CN201410739205A CN105735344A CN 105735344 A CN105735344 A CN 105735344A CN 201410739205 A CN201410739205 A CN 201410739205A CN 105735344 A CN105735344 A CN 105735344A
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Abstract
The invention relates to the geotechnical engineering depth ground pit construction field, and specifically refers to a circle ground pit lining wall steel bar colligation support comprising side poles, cross bars and grab bars; two side poles are vertically symmetrically arranged; three cross bars are arranged, and two ends of each cross bar are respectively connected with the two side poles; the three cross bars are respectively arranged on the top, the bottom and the middle of the two side poles; a plurality of grab bars are transversely fixed on each side pole from top to bottom, and the grab bars on the two side poles are symmetrically arranged; the side poles, cross bars and grab bars are arranged on a same plane. The support is convenient in steel bar colligation, and can improve circle ground pit reverse building construction lining wall steel bar colligation quality and efficiency; in addition, the method can optimize lining wall steel bar cage arrangement, thus fast positioning and mounting lining wall annular steel bars, and finishing lining wall reverse building construction purpose.
Description
Technical field
The present invention relates to Geotechnical Engineering deep foundation pit construction field, be specially support and the inwall contrary sequence method of Circular Pit inwall reinforcing bar binding.
Background technology
In Circular Pit digging process, for controlling the deformation of the foundation ditch periphery soil body in tolerance band, generally adopt the mode that building enclosure and horizontal support combine.Different with the physical and mechanical property of the soil body according to the excavation of foundation pit degree of depth, building enclosure generally adopts bored concrete pile or continuous underground wall structure.Horizontal support is usually chosen in the version designing ring beam or circular inner liner wall inside building enclosure, and outside the foundation ditch that can building enclosure transmission be come, horizontal earth pressure is converted into and acts on the radial pressure that circular horizontal supports.This supporting form, it is possible to play circular arch effect, make full use of concrete compressive property, effectively reduces the deformation of the periphery soil body during excavation of foundation pit.
As the Circular Pit inwall of horizontal support, for reinforced concrete structure, generally adopt reverse construction.According to excavation of foundation pit design conditions, being from top to bottom layered and progressively excavate, often excavation one section, carries out the construction of inwall immediately.See on the whole, inwall from top to bottom, section construction complete, i.e. reverse construction.Generally, the height of every section of inwall is 3 ~ 4m.The processes such as the construction of every section of inwall mainly includes assembling reinforcement, installs template, casting concrete, maintenance and form removal.
For as horizontal support, the inwall undertaking horizontal earth pressure, mainly including circumferential reinforcement and two kinds of patterns of vertical reinforcement.Circumferential reinforcement is main steel bar stress, and vertical reinforcement plays a role as stirrup.For ensureing intensity and the integral rigidity of inwall structure, the prescription of reinforcing bar binding in body of wall is higher.If being collided during inaccurate, the installation form in reinforcing bar binding location with extrude and be subject to extension during disturbing concrete and draw, reinforcing bar all can be made to produce dislocation, affect stress and the protective layer thickness of structure, cause quality problems.It addition, reinforcing bar often comparatively dense in inwall, hoop, vertical reinforcement cross point connection construction extremely inconvenient, efficiency of construction impact is very big.
Through existing literature search is found, Yang Yong is at " in soft soil foundation the method for designing of ultra-deep Circular Pit and construction technology " (Xi'an University of Architecture and Technology's master thesis, 2008 04 month) in a literary composition, Luojing engineering 4200mm Wide and Thick Slab Whirlwind tank engineering is moved in conjunction with Pu steel, the design of Whirlwind tank ultra-deep foundation pit under Soft Soil and construction method are described, the adverse construction method of inwall is briefly described, but the problem of the colligation quality and efficiency of construction that improve wall steel bar has not been illustrated.
Summary of the invention
When present invention aims to Circular Pit inwall adverse construction method, the problem that wall steel bar colligation is second-rate, inefficient, there is provided a kind of and ensure that reinforcing bar is accurately positioned, improves colligation efficiency, strengthens the instrument of wall steel bar cage stability in the large and the method using the quick adverse construction method inwall of this instrument.
In order to achieve the above object, the present invention is achieved in that
The support of a kind of Circular Pit inwall reinforcing bar binding, it includes side rod, cross bar and ladder bars, and side rod has two, and perpendicular symmetry shape is arranged；Cross bar has three, and the two ends of every cross bar connect respectively at two side rods, and three cross bars lay respectively at the top of two side rods, bottom and middle part；Ladder bars has several, and from top to down is secured transverse on every side rod and ladder bars symmetrically shape on two side rods；Above-mentioned side rod, cross bar, ladder bars are respectively positioned in same plane.
Use the construction method of the Circular Pit inwall of above-mentioned support, comprise the steps,
The first step, construction the going along with sb. to guard him and water sealing structure of Circular Pit, by the designing requirement side embedded bar in building enclosure；
Second step, excavation Circular Pit are to specifying absolute altitude, inwall position is carried out horizontal cutting, specifically, if ground floor inwall, then carry out the fluting bottom inwall, paving sand watering pads, lays malthoid operation, if second or other layer of inwall, then also the lower concrete of reply upper strata inwall carries out clearing up and dabbing；
3rd step, the concrete of digging, clear up building enclosure horizontal in the embedded bar position of building enclosure, to form shearing groove to inwall position, and by curved for embedded bar to precalculated position；
4th step, at the support described in inwall position at predetermined intervals laterally disposed multiple claim 1, the side rod requiring stent outer flushes with the surface of inwall, when inner lining construction wall is ground floor inwall, by fixing in the malthoid of insertion ground, the side rod bottom sand bed overlying of support, if the inwall of construction is second or other layer of inwall, also the side rod bottom of bracket lip masthead end Yu last layer inwall medium-height trestle should be welded and fixed；
5th step, the ladder bars of side rod arranges inside each support circumferential reinforcement inside inwall, junction U-stirrups colligation at circumferential reinforcement Yu each support is fixed, specifically, U-stirrups has multiple and point two-layer setting, the rational height that every layer of opening is estimated is the 2/3 of this layer of inwall height from top to down, from bottom to top height 2,3, the U-stirrups hoop being located in the same horizontal plane arranges one at interval of 20cm, until all circumferential reinforcements of its place plane have U-stirrups colligation to fix, the opening of U-stirrups outwardly, is enclosed within circumferential reinforcement；Additionally, also the embedded bar in shearing groove should be welded with contiguous circumferential reinforcement；
6th step, circumferential reinforcement outside inwall is set in the ladder bars of stent outer side rod, circumferential reinforcement with the junction of each support the colligation of same U-stirrups fix, specifically, U-stirrups has multiple and point two-layer setting, the rational height that every layer of opening is estimated is the 2/3 of this layer of inwall height from top to down, from bottom to top height 2,3, the U-stirrups hoop being located in the same horizontal plane arranges one at interval of 20cm, until all circumferential reinforcements of its place plane have U-stirrups colligation to fix, the opening of U-stirrups inwardly, is enclosed within circumferential reinforcement；So far, the steel reinforcement cage of inwall is built complete, meanwhile, at the outside pre-doweling of spacing 50cm welt of each support, levels liner body of wall is connected as an entirety；
7th step, installing template at each stent outer, template top has outward-dipping entrance, and the height of template is beyond the height of upper strata inwall；
8th step, utilizes tremie placing concrete along template entrance, and stretches into vibrating spear vibrated concrete along entrance；
9th step, after inwall concrete is carried out maintenance 28 days, form removal, cuts any excess concrete that template angle is prominent, completes the construction of this section of inwall.
By the present invention in that with the support being easy to reinforcing bar binding, improve the reinforcing bar binding quality of Circular Pit adverse construction method inwall and the instrument of efficiency.Meanwhile, adopt described construction method, it is possible to the steel reinforcement cage optimizing liner body of wall is arranged, reach quick location, liner body of wall circumferential reinforcement is installed, complete the purpose of the adverse construction method of liner body of wall.
Accompanying drawing explanation
The structural representation of Fig. 1 support.
The scale diagrams of Fig. 2 support.
Fig. 3 excavation of foundation pit is to inwall body running face
Schematic diagram placed by Fig. 4 support.
Inside Fig. 5 inwall, hoop muscle places schematic diagram.
U-stirrups schematic diagram inside Fig. 6 placement, colligation.
Fig. 7 placement, colligation outer openings stirrup, bury joint bar schematic diagram underground.
Fig. 8 sets up liner wall form.
Detailed description of the invention
Circular Pit second layer inwall adverse construction method below by way of thick 1m, the every section of 100mm that builds that to be highly 3m, thickness of protection tier be is example (building enclosure is bored concrete pile), in conjunction with accompanying drawing, embodiments of the invention is described in detail.
As it is shown in figure 1, the support of a kind of Circular Pit inwall adverse construction method reinforcing bar binding, it includes side rod 1, ladder bars 2 and cross bar 3；It is 4 that ladder bars 2 is used for arranging circumferential reinforcement.
As in figure 2 it is shown, the side rod 1 of support is made up of two reinforcing bars, bar diameter is 22mm, and length is equal, consistent with inwall height.
The ladder bars 2 of support be side rod 1 with diameter reinforcement fabrication, length is 20cm, according to liner body of wall circumferential reinforcement between the upper and lower from, be welded on inside side rod, for circumferential reinforcement 4 provide support fixing point.
The cross bar 3 of support is made up of three reinforcing bars; for side rod 1 with diameter reinforcement fabrication; length deducts liner body of wall thickness of protection tier equal to inwall body thickness; cross bar 3 is welded on the middle part of side rod 1 and upper and lower two ends; and reserve certain distance with end, it is simple to the welding of support in levels inwall body.
Rack making carries out inwall pouring construction after completing, and specifically includes following steps:
The first step, going along with sb. to guard him and water sealing structure of construction Circular Pit, and by designing requirement embedded bar on the steel reinforcement cage of building enclosure, in order to liner body of wall and building enclosure to be linked to be entirety, and undertake the part deadweight of liner body of wall.
Second step, as it is shown on figure 3, excavation pit is to specifying absolute altitude, clears up inwall work surface.If ground floor inwall, it is mainly the fluting bottom inwall, paving sand watering pads, lays the work such as malthoid.In addition to the above, also reply upper strata inwall lower concrete carries out clearing up and dabbing other layer of inwall.
3rd step, as shown in Figure 4, in the embedded bar position of building enclosure, digs, clears up building enclosure concrete (forming shearing groove), by curved for embedded bar to precalculated position.
4th step, as shown in Figure 4, places described instrument with a determining deviation, it is desirable to frame plane is vertical with inwall inner surface.If ground floor inwall, by fixing in the malthoid of insertion ground, described instrument lower end sand bed overlying.The bottom reinforcement welding of described tool tip reinforcing bar with instrument described in the inwall of upper strata in addition to the above, also should be fixed by other layer of inwall.
5th step, is placed adjacent to the inwall circumferential reinforcement of building enclosure side as it is shown in figure 5, intert in described instrument ladder bars, fixes in the colligation of delivery position place.As shown in Figure 6, for increasing the stability in the large of circumferential reinforcement, U-stirrups (replacement vertical reinforcement) is adopted to be fixed.U-stirrups is the 2/3 of inwall height, each one up and down, wales every layer of all circumferential reinforcement, and every 20cm places one.The opening of U-stirrups outwardly, is enclosed within circumferential reinforcement, and fixes in the colligation of delivery position place.Additionally, also shearing groove embedded bar should be welded with contiguous circumferential reinforcement.
6th step, places circumferential reinforcement outside inwall as it is shown in fig. 7, intert in the ladder bars of described instrument, fixes in the colligation of delivery position place.Identical with the 5th step, U-stirrups is enclosed within the circumferential reinforcement of outside.U-stirrups is the 2/3 of inwall height, each one up and down, wales every layer of all circumferential reinforcement, and every 20cm places one.The opening of U-stirrups inwardly, is enclosed within circumferential reinforcement, and fixes in the colligation of delivery position place, and is welded by medial and lateral correspondence U-stirrups.Additionally, outside liner body of wall steel reinforcement cage, the pre-doweling of spacing 50cm welt, levels liner body of wall is connected as an entirety.
7th step, as shown in Figure 8, installs template, and template topmost makes outside angle, and beyond upper strata inwall end face.
8th step, utilizes tremie placing concrete along angle, until beyond inwall bottom surface, upper strata 0.5m, stretching into vibrating spear vibrated concrete along angle.
9th step, after inwall concrete is carried out maintenance 28 days, form removal, cuts any excess concrete that template angle is prominent, completes the construction of this section of inwall.
Claims (2)
1. a Circular Pit inwall steel reinforcement cage binding stand, is characterized in that: it includes side rod, cross bar and ladder bars, and side rod has two, and perpendicular symmetry shape is arranged；Cross bar has three, and the two ends of every cross bar connect respectively at two side rods, and three cross bars lay respectively at the top of two side rods, bottom and middle part；Ladder bars has several, and from top to down is secured transverse on every side rod and ladder bars symmetrically shape on two side rods；Above-mentioned side rod, cross bar, ladder bars are respectively positioned in same plane.
2. a contrary sequence method for Circular Pit inwall, is characterized in that: comprise the steps,
The first step, construction the going along with sb. to guard him and water sealing structure of Circular Pit, by the designing requirement side embedded bar in building enclosure；
Second step, excavation Circular Pit are to specifying absolute altitude, inwall position is carried out horizontal cutting, specifically, if ground floor inwall, then carry out the fluting bottom inwall, paving sand watering pads, lays malthoid operation, if second or other layer of inwall, then also the lower concrete of reply upper strata inwall carries out clearing up and dabbing；
3rd step, the concrete of digging, clear up building enclosure horizontal in the embedded bar position of building enclosure, to form shearing groove to inwall position, and by curved for embedded bar to precalculated position；
4th step, at the support described in inwall position at predetermined intervals laterally disposed multiple claim 1, the side rod requiring stent outer flushes with the surface of inwall, when inner lining construction wall is ground floor inwall, by fixing in the malthoid of insertion ground, the side rod bottom sand bed overlying of support, if the inwall of construction is second or other layer of inwall, also the side rod bottom of bracket lip masthead end Yu last layer inwall medium-height trestle should be welded and fixed；
5th step, the ladder bars of side rod arranges inside each support circumferential reinforcement inside inwall, junction U-stirrups colligation at circumferential reinforcement Yu each support is fixed, specifically, U-stirrups has multiple and point two-layer setting, the rational height that every layer of opening is estimated is the 2/3 of this layer of inwall height from top to down, from bottom to top height 2,3, the U-stirrups hoop being located in the same horizontal plane arranges one at interval of 20cm, until all circumferential reinforcements of its place plane have U-stirrups colligation to fix, the opening of U-stirrups outwardly, is enclosed within circumferential reinforcement；Additionally, also the embedded bar in shearing groove should be welded with contiguous circumferential reinforcement；
6th step, circumferential reinforcement outside inwall is set in the ladder bars of stent outer side rod, circumferential reinforcement with the junction of each support the colligation of same U-stirrups fix, specifically, U-stirrups has multiple and point two-layer setting, the rational height that every layer of opening is estimated is the 2/3 of this layer of inwall height from top to down, from bottom to top height 2,3, the U-stirrups hoop being located in the same horizontal plane arranges one at interval of 20cm, until all circumferential reinforcements of its place plane have U-stirrups colligation to fix, the opening of U-stirrups inwardly, is enclosed within circumferential reinforcement；So far, the steel reinforcement cage of inwall is built complete, meanwhile, at the outside pre-doweling of spacing 50cm welt of each support, levels liner body of wall is connected as an entirety；
7th step, installing template at each stent outer, template top has outward-dipping entrance, and the height of template is beyond the height of upper strata inwall；
8th step, utilizes tremie placing concrete along template entrance, and stretches into vibrating spear vibrated concrete along entrance；
9th step, after inwall concrete is carried out maintenance 28 days, form removal, cuts any excess concrete that template angle is prominent, completes the construction of this section of inwall.
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| CN201410739205.1A CN105735344B (en) | 2014-12-08 | 2014-12-08 | The contrary sequence method of Circular Pit inwall |
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| CN201410739205.1A CN105735344B (en) | 2014-12-08 | 2014-12-08 | The contrary sequence method of Circular Pit inwall |
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| CN105735344B CN105735344B (en) | 2019-03-15 |
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| CN110397039A (en) * | 2019-07-13 | 2019-11-01 | 济邦建设集团有限公司 | A kind of construction method of deep foundation ditch |
| CN110552371A (en) * | 2019-08-30 | 2019-12-10 | 中国一冶集团有限公司 | Construction method for eliminating horizontal construction joints of annular lining wall based on reverse construction method |
| CN110552370A (en) * | 2019-08-30 | 2019-12-10 | 中国一冶集团有限公司 | Reverse construction method based annular lining wall integral single-side formwork construction method |
| CN111636483A (en) * | 2020-05-08 | 2020-09-08 | 中铁隧道集团二处有限公司 | Waterproof device for reverse construction concrete structure gap and construction method |
| CN113882387A (en) * | 2021-09-01 | 2022-01-04 | 武汉市政工程设计研究院有限责任公司 | Large-diameter circular ultra-deep foundation pit reverse construction structure without inner support and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110552370A (en) * | 2019-08-30 | 2019-12-10 | 中国一冶集团有限公司 | Reverse construction method based annular lining wall integral single-side formwork construction method |
| CN111636483A (en) * | 2020-05-08 | 2020-09-08 | 中铁隧道集团二处有限公司 | Waterproof device for reverse construction concrete structure gap and construction method |
| CN113882387A (en) * | 2021-09-01 | 2022-01-04 | 武汉市政工程设计研究院有限责任公司 | Large-diameter circular ultra-deep foundation pit reverse construction structure without inner support and construction method |
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| CN105735344B (en) | 2019-03-15 |
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