CN101187210A - Metro engineering pile foundation underpinning construction method - Google Patents
Metro engineering pile foundation underpinning construction method Download PDFInfo
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- CN101187210A CN101187210A CNA2007100599126A CN200710059912A CN101187210A CN 101187210 A CN101187210 A CN 101187210A CN A2007100599126 A CNA2007100599126 A CN A2007100599126A CN 200710059912 A CN200710059912 A CN 200710059912A CN 101187210 A CN101187210 A CN 101187210A
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Abstract
The invention relates to a railway engineering pile foundation underpinning construction method, the procedures comprise reinforcing the ground, namely, a pedestrian bridge is supported by a steel pipe scaffold on the ground, and processing in a cave, firstly, concrete which is distributed on the surface layer of a pile is removed, secondly, enciphering grids are set up, thirdly, muscles are planted and formwork lining umbrella arch is poured, fourthly, piles are sectionalized and secondary lining concrete is poured, namely, when the formwork lining on the lower portion of support at primary stage achieves the intensity which is designed, base piles in tunnel lining is removed, and boundary agent is brushed, and a foam board bedding layer is further arranged, and a water-protecting layer is made, and space interval structure formwork lining is poured. The invention has the advantages that firstly, the monitor measure data of on site construction shows that the largest sedimentation of pile accumulation is 8047mm, and the largest discrepancy sedimentation is 291mm. Cracks are not founded during the construction period though the observation of a hat beam, and sedimentation of piles and bending deflection of the hat beam is designed in the regulated scope, and the deformation rule conforms to the design account, which fully shows that underpinning design of piles is reliable and safe, secondly, the invention saves investment.
Description
Technical field:
The invention belongs to a kind of construction techniques, particularly a kind of metro engineering pile foundation underpinning construction method.
Background technology:
That situation space crossed or that be close to away takes place is very many with bridge, channel establishment in the present municipal underground construction, the schemes that great majority adopt are to tear down and reconstruct existing bridge, logical facility, and this method work progress complexity, poor stability, investment is big and have a strong impact on surrounding environment.
Summary of the invention:
Purpose of the present invention just is to overcome above-mentioned the deficiencies in the prior art, and a kind of metro engineering pile foundation underpinning construction method is provided, and this method construction technology is simple, safety, reliable.
Technical scheme of the present invention is: a kind of metro engineering pile foundation underpinning construction method is characterized in that: carry out according to the following step: A: ground reinforces: with steel pipe scaffold pedestrian overcrossing is carried out rest on the ground; B: processing in the hole: carry out according to the following step: 1. substep cuts bridge pier top layer concrete; Earlier set double-deck grouting with small pipe strengthening stratum in the arch, then carry out the preliminary bracing of this section tunnel excavation, the soil excavation of topping bar is taked the arc excavation, reserves core soil, when constructing to the bridge pier place, with preliminary bracing and top layer, pile foundation intersection area concrete chisel removal; 2. the upright grid of encrypting of frame: at every turn cut behind the concrete of top layer the upright grid of frame immediately, and with the welding of reinforcing bar and grid master muscle, simultaneously the vertical dowel in this section grid arch is encrypted, forming continuous rigid structures by grid underpins pile foundation, encrypt dowel and form the longitudinal beam body, be transferred on the Continuous Grid-structures pile foundation is stressed; 3. bar planting and build moulded lining cover arch: treat preliminary bracing apply finish after, utilize core soil as operating platform, cut lining cutting of preliminary bracing bottom and pile body top layer, bridge pier intersection area concrete, the pile foundation reinforcing bar is exposed, implant reinforcing bar to bridge pier, and, pour into a mould preliminary bracing lower die building lining then with reinforcing bar and the preliminary bracing bottom lining cutting master muscle firm welding implanted, form and underpin the cover arch; 4. cut stake, build the secondary lining concrete: after treating that preliminary bracing lower die building lining reaches design strength, cut foundation pile in the tunnel lining, the brushing interfacial agents is set up the cystosepiment bed course, performs waterproofing course, cast interval structure moulded lining.
Above-mentioned pillar adopts the bowl fastening type scaffold, and spacing 0.3m is adopted in vertical rod, all establishes up and down and can regulate jacking and 10cm * 10cm lumps of wood.
Above-mentioned reservation core soil length 2～3m.
Advantage of the present invention is:
1, this job practices shows through the monitoring measurement data of site operation, and pile foundation accumulative total maximum settlement is 8.47mm, and the maximum difference sedimentation is 2.91mm.By the observation to cap, construction period is not found the crack.The sedimentation of pile foundation, the amount of deflection of cap are all in the design code scope, and its deformation rule also conforms to designing and calculating, show that fully the pile foundation underpinning design is that construction is successful reliably.2, reduce investment outlay.
Description of drawings:
Fig. 1 is that the face of land reinforces schematic diagram.
Fig. 2 is the bar planting structural representation.
The A-A sectional drawing of Fig. 3 Fig. 2.
The B-B sectional drawing of Fig. 4 Fig. 2.
The C-C sectional drawing of Fig. 5 Fig. 2.
The specific embodiment:
Station, the yellow village of No. ten lines of Beijing Metro-tunnel, interval, station, section South Road (hereinafter to be referred as yellow section interval) adopts the shallow burial hidden digging construction, wears under the tunnel and knows the spring road, along knowing that the spring road is east-west.Interval right threaded list road is worn under the k2+629.983 place and is known spring mansion pedestrian overcrossing, and running tunnel and bridge pile foundation take place space crossed.This section is an interval circuit horn mouth segregation section, and tunnel structure is the Double Multi-Arch form of fracture, method construction in hole in the employing.Know that spring mansion pedestrian overcrossing superstructure girder is three Span Continuous, two a Room sealing girder steel, terraced beam is a freely-supported steel step plate, and bridge pier is φ 1000 bored piles, the long 15.2m of stake, the tunnel roof buried depth 8.348m of this place.The intrusion of overline bridge king pile base also runs through right threaded list road structure.The bridge pier pile center of another terraced Liang Chu is apart from tunnel structure outline 2.871m.For guaranteeing pedestrian overcrossing safety in the work progress, intend taking ground to reinforce the processing scheme that combines with reinforcing in the hole to overline bridge.
Geologic feature:
This section tunnel vault penetrating ground is mainly: farinose argillic horizon, powder soil horizon; The tunnel trunk penetrating ground is mainly farinose argillic horizon, powder soil horizon, circle gravel boulder bed, medium coarse sand, fine sand layer; The tunnel floor penetrating ground is mainly round gravel boulder bed, medium coarse sand, fine sand layer.Base plate is positioned at below the phreatic table, has taked well-points dewatering measure drainage underground water before the construction in the tunnel scope.
Spatial relationship and actual conditions according to bridge pier and interval structure; at running tunnel by knowing mansion pedestrian overcrossing when construction in spring; take face of land rest to reinforce the protection scheme that combines with consolidation process in the hole to knowing spring mansion pedestrian overcrossing; construction period, overline bridge carried out traffic control, guaranteed overline bridge safety in the work progress.
1, ground reinforces: (as shown in Figure 1)
With steel pipe scaffold pedestrian overcrossing is carried out rest on the ground, disperse the pressure of pile foundation top, the tunnel soil body.Construct to k2+631.983 at running tunnel, 1 pair of each bridge pier 2 of pedestrian overcrossing adopts steel pipe scaffold 3 to carry out rest on the face of land, and pillar adopts the bowl fastening type scaffold, and spacing 0.3m is adopted in vertical rod, all establishes up and down and can regulate jacking 4 and 10cm * 10cm lumps of wood 5.
2, reinforce in the hole: (shown in Fig. 2,3,4,5)
Concrete job practices is as follows:
1. branch cuts bridge pier top layer concrete.
This section tunnel adopts the construction of " CD " method, and cubic metre of earth arc excavation of topping bar is reserved core soil, avoids bridge pier sharply to descend because of soil excavation pile foundation friction bearing capacity, must guarantee core soil length 2～3m simultaneously.When last section soil excavation during to the bridge pier place, according to field condition, at first linked network is sprayed the thick concrete of 4cm, then vault excavation outline line scope pile body top layer concrete is cut a hole hair, make and expose bridge pier master muscle, and the timely upright grid 6 of frame, with φ 22 " L " shaped steel muscle 7 (two edge lengths are not less than 10d) bridge pier master muscle and this Pin grid master's muscle and last Pin grid master muscle, vertical dowel 8 being welded, pneumatically placed concrete seals.When excavation top bar core soil, when setting up interim inverted arch i iron,, bridge pier master muscle and i iron are welded together with φ 22 " L " shaped steel muscle to interim inverted arch and bridge pier intersection area concrete chisel hair, sprayed mortar is topped bar and is sealed into ring.Get out of a predicament or an embarrassing situation soil excavation during to the bridge pier position, to inverted arch and top layer, bridge pier intersection area concrete chisel hair, with bridge pier master muscle and inverted arch grid master's muscle and the welding of vertical dowel, sprayed mortar seals with φ 22 " L " shaped steel muscle, form cushion cap, bridge pier is carried out support.
2. frame stands and encrypts grid.
Because the tunnel soil excavation, pile foundation exposes, and the suffered frictional force of stake reduces, and causes the pile foundation bearing capacity to seriously undermine, and is to guarantee bearing capacity of pile foundation,, the upright grid 6 of frame immediately behind the concrete of each cutter hair top layer, and weld with φ 22 " L " shaped steel muscle 7 and grid master muscle.The vertical dowel 8 in this section grid arch is encrypted as 50cm simultaneously, forms continuous rigid structures by grid pile foundation is underpined, and encrypts dowel and forms the longitudinal beam body, is transferred on the Continuous Grid-structures pile foundation is stressed.
3. bar planting and build preliminary bracing lower die building lining cover arch.(shown in Fig. 2,3,4,5)
Treat preliminary bracing apply finish after, utilize core soil as operating platform, cut lining cutting of preliminary bracing bottom and pile body top layer, bridge pier intersection area concrete, the pile foundation reinforcing bar is exposed, implant φ 22 reinforcing bars 9 to bridge pier, and, pour into a mould preliminary bracing lower die building lining then with φ 22 reinforcing bars and the preliminary bracing bottom lining cutting master muscle firm welding implanted, form and underpin the cover arch.
4. cut stake, build the secondary lining concrete.
After treating that preliminary bracing lower die building lining reaches design strength, cut foundation pile in the tunnel lining, the brushing interfacial agents is set up the thick cystosepiment bed course of 10mm, performs waterproofing course, cast interval structure moulded lining.
Claims (3)
1. a metro engineering pile foundation underpinning construction method is characterized in that: carry out according to the following step: A: ground reinforcing: with steel pipe scaffold pedestrian overcrossing is carried out rest on the ground; B: processing in the hole: carry out according to the following step: 1. substep cuts bridge pier top layer concrete; Earlier set double-deck grouting with small pipe strengthening stratum in the arch, then carry out the preliminary bracing of this section tunnel excavation, the soil excavation of topping bar is taked the arc excavation, reserves core soil, when constructing to the bridge pier place, with preliminary bracing and top layer, pile foundation intersection area concrete chisel removal; 2. the upright grid of encrypting of frame: at every turn cut behind the concrete of top layer the upright grid of frame immediately, and with the welding of reinforcing bar and grid master muscle, simultaneously the vertical dowel in this section grid arch is encrypted, forming continuous rigid structures by grid underpins pile foundation, encrypt dowel and form the longitudinal beam body, be transferred on the Continuous Grid-structures pile foundation is stressed; 3. bar planting and build moulded lining cover arch: treat preliminary bracing apply finish after, utilize core soil as operating platform, cut lining cutting of preliminary bracing bottom and pile body top layer, bridge pier intersection area concrete, the pile foundation reinforcing bar is exposed, implant reinforcing bar to bridge pier, and, pour into a mould preliminary bracing lower die building lining then with reinforcing bar and the preliminary bracing bottom lining cutting master muscle firm welding implanted, form and underpin the cover arch; 4. cut stake, build the secondary lining concrete: after treating that preliminary bracing lower die building lining reaches design strength, cut foundation pile in the tunnel lining, the brushing interfacial agents is set up the cystosepiment bed course, performs waterproofing course, cast interval structure moulded lining.
2. metro engineering pile foundation underpinning construction method according to claim 1 is characterized in that: above-mentioned pillar adopts the bowl fastening type scaffold, and spacing 0.3m is adopted in vertical rod, all establishes up and down and can regulate jacking and 10cm * 10cm lumps of wood.
3. metro engineering pile foundation underpinning construction method according to claim 1 is characterized in that: above-mentioned reservation core soil length 2～3m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100599126A CN100464035C (en) | 2007-10-17 | 2007-10-17 | Metro engineering pile foundation underpinning construction method |
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| CNB2007100599126A CN100464035C (en) | 2007-10-17 | 2007-10-17 | Metro engineering pile foundation underpinning construction method |
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| CN101187210A true CN101187210A (en) | 2008-05-28 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102477738A (en) * | 2010-11-25 | 2012-05-30 | 中铁十八局集团有限公司 | Device for supporting bridge pile after removal of surface concrete |
| CN104695983A (en) * | 2013-12-09 | 2015-06-10 | 中铁十三局集团有限公司 | Method for welding embedded steel bar welding joints of two end nodes in initial supporting arch |
| CN105155867A (en) * | 2015-09-30 | 2015-12-16 | 贵州正业工程技术投资有限公司 | Underpinning device for tunnel to pass through existing large-diameter pile building |
| CN108360838A (en) * | 2018-03-16 | 2018-08-03 | 湖南科技学院 | Steel reinforced concrete support underpins frame and its construction method |
| CN109441488A (en) * | 2018-12-28 | 2019-03-08 | 无锡快鹿地铁钢结构制造有限公司 | Subway Tunnel Lining construction method |
| CN113846671A (en) * | 2021-07-16 | 2021-12-28 | 中铁二院华东勘察设计有限责任公司 | Up-down separately digging type construction method for underground passage crossing under upper building pile foundation |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1652440A1 (en) * | 1987-11-04 | 1991-05-30 | Минский Филиал Проектно-Изыскательского Института "Метрогипротранс" | Method for protection of buildings and structures from shear deformation of ground |
| US5433557A (en) * | 1993-12-27 | 1995-07-18 | Spencer, White & Prentis Foundation Corporation | Method for underpinning an existing footing |
| CN1111627C (en) * | 1995-05-17 | 2003-06-18 | 广州市鲁班建筑防水补强专业公司 | Method for connecting anchor-rod type supporting table |
| CN100443672C (en) * | 2006-03-08 | 2008-12-17 | 中铁隧道集团有限公司 | Underpinning method of pile ground underground |
-
2007
- 2007-10-17 CN CNB2007100599126A patent/CN100464035C/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102477738A (en) * | 2010-11-25 | 2012-05-30 | 中铁十八局集团有限公司 | Device for supporting bridge pile after removal of surface concrete |
| CN104695983A (en) * | 2013-12-09 | 2015-06-10 | 中铁十三局集团有限公司 | Method for welding embedded steel bar welding joints of two end nodes in initial supporting arch |
| CN104695983B (en) * | 2013-12-09 | 2017-02-01 | 中铁十三局集团有限公司 | Method for welding embedded steel bar welding joints of two end nodes in initial supporting arch |
| CN105155867A (en) * | 2015-09-30 | 2015-12-16 | 贵州正业工程技术投资有限公司 | Underpinning device for tunnel to pass through existing large-diameter pile building |
| CN108360838A (en) * | 2018-03-16 | 2018-08-03 | 湖南科技学院 | Steel reinforced concrete support underpins frame and its construction method |
| CN108360838B (en) * | 2018-03-16 | 2023-07-25 | 湖南科技学院 | Steel-concrete support bracket and construction method thereof |
| CN109441488A (en) * | 2018-12-28 | 2019-03-08 | 无锡快鹿地铁钢结构制造有限公司 | Subway Tunnel Lining construction method |
| CN109441488B (en) * | 2018-12-28 | 2020-03-27 | 无锡快鹿地铁钢结构制造有限公司 | Subway tunnel lining construction method |
| CN113846671A (en) * | 2021-07-16 | 2021-12-28 | 中铁二院华东勘察设计有限责任公司 | Up-down separately digging type construction method for underground passage crossing under upper building pile foundation |
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| Publication number | Publication date |
|---|---|
| CN100464035C (en) | 2009-02-25 |
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Address after: 300222 Tianjin Town, Jinnan District Patentee after: the Eighteenth Bureau of China's Railroad Group Co., Ltd. Address before: 300222 Liulin, Hexi District, Tianjin Patentee before: the Eighteenth Bureau of China's Railroad Group Co., Ltd. |