CN102758443B - Novel enclosing structure applicable to connection change between new pipes and old pipes and construction method thereof - Google Patents
Novel enclosing structure applicable to connection change between new pipes and old pipes and construction method thereof Download PDFInfo
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- CN102758443B CN102758443B CN201210260368.2A CN201210260368A CN102758443B CN 102758443 B CN102758443 B CN 102758443B CN 201210260368 A CN201210260368 A CN 201210260368A CN 102758443 B CN102758443 B CN 102758443B
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Abstract
The invention provides a novel enclosing structure applicable to connection change between new pipes and old pipes and a construction method thereof. Since the construction method which is used for reinforcing soil bodies under a pipeline under the condition that the enclosing structure can not be closed since the large-diameter pipeline penetrates through the enclosing structure of a foundation pit. By utilizing the combined enclosing structure with an SMW (Soil Mixing Wall) construction method, an MJS (Multiple Jet Solidification) construction method and a double-pipe rotary jetting construction method, the old sewage pipe is protected, and simultaneously, the excavation safety of the outer-covering foundation pit is guaranteed. Due to large pile diameter and good quality of a pile body in the MJS construction method, the influence on the old sewage pipe is less, the closure of the combined enclosing structure at the old sewage pipeline is ensured; double-pipe rotary jet is adopted from the part above 70cm of the pipe top of the old sewage pipe to the ground, the construction cost is greatly saved; after cutting, the old sewage pipe is chiseled off, so that the need for reutilizing the integrity of the structure of the old sewage pipe is ensured; after the water is stopped, the old sewage pie is cut and removed, then the space for construction of the foundation pit is increased, and the entering of the top pipe of the new sewage pipe into a hole is convenient, so that the construction size of the combined enclosing structure is reduced.
Description
Technical field
The present invention relates to a kind of novel combination type construction method of enclosure structure, espespecially a kind of for major diameter the old and new pipe reconfiguration bracing of foundation pit work progress, this novel compositions space enclosing structure plays the effect of antiseepage gear soil.
Background technology
Because the old soil pipe of major diameter (or rain pipe) causes foundation ditch to close, and degree of depth 11.2m at the bottom of Foundation Pit, old soil pipe external diameter reaches 2420mm, old soil pipe pipe top degree of depth 7.59m, again because of old soil pipe and foundation ditch oblique, single form breach of going along with sb. to guard him is adopted to reach 4.7m*3.6m, adopt conventional churning (triple pipe rotary spray) expanded diameter at 800 ~ 2000mm, for reinforcing the large technology barrier of existence two at the bottom of major diameter soil pipe pipe: the first reinforcing scope does not reach requirement, and second is excessive to old soil pipe disturbance.
Summary of the invention
The present invention is directed to the deficiencies in the prior art; there is provided a kind of and pass through the construction method of when foundation pit enclosure structure causes space enclosing structure to close, the soil body below pipeline being reinforced because of big inch line (go along with sb. to guard him construction period cannot block, need protection); first solves the existing technique problem excessive to pipeline disturbance when pipeline bottom soil stabilization, and second solves that domestic conventional high pressure jet grouting technique comprises single pipe method, double tube method, tri-tube method, two high-pressure process reinforcing scope cannot meet design requirement reinforces the problem that diameter 3.1m requires.While the present invention adopts SMW engineering method, MJS engineering method and dual pipe churning engineering method combined type space enclosing structure to protect old soil pipe, ensure the construction method of outsourcing excavation of foundation pit safety, the method comprises:
Minor thread bores the accurately old soil pipe in location, guarantees that SMW works are gone along with sb. to guard him and conforms to design drawing with the relative position of old soil pipe;
When outside old soil pipe foundation ditch, extension SMW goes along with sb. to guard him construction, reserved MJS engineering method drilling construction space;
Adopt the construction of MJS engineering method;
Double pipe rotary jet strengthening walks: adopt double pipe churning to carry out soil stabilization to above MJS soil mass consolidation to ground areas;
The old soil pipe of cutting disassembling: at the bottom of excavation of foundation pit to pipe, old soil pipe in chain type cutting hole, cuts the old soil pipe of cutting part;
The old and new's pipe reconfiguration: newly-built soil pipe push pipe enters hole, hangs out push pipe head, construction outsourcing well construction utilizes original old soil pipe to be communicated with newly-built pipeline and sewage lifting pump station.
As a further improvement on the present invention, described MJS engineering method construction, its step comprises:
Bore bullport: old soil pipe passes through SMW engineering method and goes along with sb. to guard him outside, adopt engineering driller drill bit as the bullport of MJS engineering method slip casting, the verticality of boring and old soil pipe must be guaranteed;
The drill bit press-in soil body: unit head 180 ° rotation, is pressed into the soil body by drill bit;
Slip casting and spoil disposal: after drill bit arrives desired depth, first drive backflow gas and backflow high-pressure pump, then when confirming that plasma discharge is normal, open spoil disposal valve, open water under high pressure dredge pump and main air compressor machine;
Jump hole construction MJS stake: adjacent two piles are greater than 24 hours interval time, implement soil stabilization at the bottom of old soil pipe pipe to pipe top.
Further improvement of the present invention, in slip casting and spoil disposal process, injection stream initial pressure reaches 40MPa, and flow is 90 ~ 130L/min about, uses single injector to spray, every meter of injecting time 30 ~ 40min, average hoisting velocity 2.5 ~ 3.3cm/min.
The present invention is owing to adopting above technical scheme, and making it have useful effect is:
MJS engineering method is by pressure monitoring in ground and the means of forcing plasma discharge, interior pressure regulates and controls over the ground, significantly can reduce the disturbance of construction to old soil pipe, and ensure the effect that ultra-deep is constructed, injection stream initial pressure reaches 40MPa, flow is 90 ~ 130L/min about, use single injector sprays, every meter of average hoisting velocity 2.5 ~ 3.3cm/min of injecting time 30 ~ 40min(), injection stream energy is large, long action time, add stable coaxial high pressure air protection and over the ground in the adjustment of pressure, make MJS engineering method expanded diameter larger, 2 ~ 2.8m(sand N<70 can be reached, clay C<50).Spray owing to directly adopting cement grout, its pile quality is better, old soil pipe pipe top more than 70cm adopts double pipe churning greatly to save operating expenses to ground, old soil pipe is cut after cutting, ensure that the integrality needing to re-use old soil pipe structure, add the space of construction in foundation ditch after the old soil pipe of cutting disassembling of cutting off the water supply, be convenient to newly-built soil pipe push pipe and enter hole, thus decrease the construction size of combined type space enclosing structure.
Accompanying drawing explanation
Fig. 1 is the construction process figure of construction method of the present invention.
Detailed description of the invention
For the benefit of to the understanding of structure of the present invention, be described below in conjunction with drawings and Examples.
As shown in Figure 1; disclose and be provided by the present inventionly a kind ofly applicable to the novel space enclosing structure of the old and new's pipe reconfiguration and the schematic flow sheet of construction method; the novel space enclosing structure of this old and new's pipe reconfiguration and construction method are in old soil pipe reconstruction process; for the construction of the old and new's pipe reconfiguration position, especially external diameter is greater than more than 2m, protection requires high pipeline.Novel space enclosing structure and the construction method implementation step of this old and new's pipe reconfiguration comprise: minor thread brill is the old soil pipe in location, the construction of SMW engineering method fender post, brill bullport, jumping hole construction MJS stake, drill bit press-in soil body step, slip casting and spoil disposal step, double pipe rotary jet strengthening step, the old soil pipe step of cutting disassembling, the old and new's pipe reconfiguration step accurately.
Boring in minor thread accurately locates in old soil pipe step, adopts small hole by screw drilling to feel in the old soil pipe position of design drawing, leans out old soil pipe and go along with sb. to guard him two crossing edge positions, going along with sb. to guard him and soil pipe relative position according to drawing, release and go along with sb. to guard him center line.
In SWM engineering method fender post construction sequence, when outside old soil pipe foundation ditch, extension SMW goes along with sb. to guard him construction, reserved 50cmMJS engineering method drilling construction space.
In brill bullport construction sequence, pass through SMW engineering method at old soil pipe and go along with sb. to guard him outside, the 10cm position, both sides of old soil pipe, adopt G2-A engineering driller φ 180 bit bore to design elevation, as the bullport of MJS engineering method slip casting, must borehole perpendicularity be guaranteed.
In drill bit press-in soil body step, unit head 180 ° rotation, is pressed into the soil body by drill bit, in process of press in, takes and often promotes drilling pipe up and down, in case drill bit is blocked by soil block.Time as harder in soil property, water tap can be connected with drilling pipe, open and cut Kong Shui, with cutting the hole Water Cutting soil body, then unit head 180 ° rotation, is pressed into the soil body by drill bit, in process of press in, takes equally and often promotes drilling pipe up and down, in case drill bit is blocked by soil block.
In slip casting and spoil disposal step, after drill bit arrives desired depth, first drive backflow gas and backflow high-pressure pump, then when confirming that plasma discharge is normal, open spoil disposal valve, open water under high pressure dredge pump and main air compressor machine, slip casting and spoil disposal are carried out to drilling pipe.When opening water under high pressure dredge pump, pressure can not be too high, should progressively supercharging, until reach specified pressure, after reaching specified pressure and to confirm in ground that pressure is normal, just can start to promote.
In jumping hole construction MJS stake step, the interval time of adjacent two pile constructions must be greater than 24 hours, guarantee MJS engineering method pile quality, soil stabilization (old soil pipe external diameter 2410, buried depth 7.59m) is implemented to 12.5m at the bottom of old soil pipe pipe to pipe top 70cm.(by pressure monitoring in ground and the means of forcing plasma discharge, over the ground, pressure regulates and controls MJS engineering method, significantly can reduce the disturbance of construction to old soil pipe, and ensure the effect that ultra-deep is constructed)
In double pipe rotary jet strengthening step, adopt double pipe churning to carry out soil stabilization to above MJS soil mass consolidation to ground areas, adopt double pipe can save more cost compared with MJS.
In the old soil pipe step of cutting disassembling, at the bottom of excavation of foundation pit to pipe, old soil pipe in chain type cutting hole, cuts the old soil pipe of cutting part (before foundation pit construction utilization face pump water transfer realized old soil pipe and cut off the water supply).
In the old and new's pipe reconfiguration step, newly-built soil pipe push pipe enters hole, hangs out push pipe head, and construction outsourcing well construction utilizes original old soil pipe to be communicated with newly-built pipeline and sewage lifting pump station.
MJS engineering method is by pressure monitoring in ground and the means of forcing plasma discharge, interior pressure regulates and controls over the ground, significantly can reduce the disturbance of construction to old soil pipe, and ensure the effect that ultra-deep is constructed, injection stream initial pressure reaches 40MPa, flow is 90 ~ 130L/min about, use single injector sprays, every meter of average hoisting velocity 2.5 ~ 3.3cm/min of injecting time 30 ~ 40min(), injection stream energy is large, long action time, add stable coaxial high pressure air protection and over the ground in the adjustment of pressure, make MJS engineering method expanded diameter larger, 2 ~ 2.8m(sand N<70 can be reached, clay C<50).Spray owing to directly adopting cement grout, its pile quality is better, old soil pipe pipe top more than 70cm adopts double pipe churning greatly to save operating expenses to ground, old soil pipe is cut after cutting, ensure that the integrality needing to re-use old soil pipe structure, add the space of construction in foundation ditch after the old soil pipe of cutting disassembling of cutting off the water supply, be convenient to newly-built soil pipe push pipe and enter hole, thus decrease the construction size of combined type space enclosing structure.
Claims (3)
1. be applicable to a construction method for the novel space enclosing structure of the old and new's pipe reconfiguration, it is characterized in that the method comprises the following steps:
Minor thread bores the accurately old soil pipe in location, guarantees that SMW engineering method is gone along with sb. to guard him and conforms to design drawing with the relative position of old soil pipe;
When old soil pipe extension both sides SMW outside foundation ditch goes along with sb. to guard him construction, pass through SMW engineering method at old soil pipe and safeguard outside, the 10cm position, both sides of old soil pipe, reserved MJS engineering method drilling construction space;
Adopt the construction of MJS engineering method;
Double pipe rotary jet strengthening: adopt double pipe churning to carry out soil stabilization to above MJS soil mass consolidation to ground areas;
The old soil pipe of cutting disassembling: at the bottom of excavation of foundation pit to pipe, old soil pipe in chain type cutting hole, cuts the old soil pipe of cutting part;
The old and new's pipe reconfiguration: newly-built soil pipe push pipe enters hole, hangs out push pipe head, construction outsourcing well construction utilizes original old soil pipe to be communicated with newly-built pipeline and sewage lifting pump station.
2. construction method according to claim 1, is characterized in that: described MJS engineering method construction, and its step comprises:
Bore bullport: old soil pipe passes through SMW engineering method and goes along with sb. to guard him outside, adopt engineering driller drill bit as the bullport of MJS engineering method slip casting, the verticality of boring and old soil pipe must be guaranteed;
The drill bit press-in soil body: unit head 180 ° rotation, is pressed into the soil body by drill bit;
Slip casting and spoil disposal: after drill bit arrives desired depth, first drive backflow gas and backflow high-pressure pump, then when confirming that plasma discharge is normal, open spoil disposal valve, open water under high pressure dredge pump and main air compressor machine;
Jump hole construction MJS stake: adjacent two piles are greater than 24 hours interval time, implement soil stabilization at the bottom of old soil pipe pipe to pipe top.
3. construction method according to claim 2, is characterized in that: in slip casting and spoil disposal process, when spraying mud, injection stream initial pressure reaches 40MPa, flow 90 ~ 130L/min, uses single injector to spray, every meter of injecting time 30 ~ 40min, average hoisting velocity 2.5 ~ 3.3cm/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210260368.2A CN102758443B (en) | 2012-07-25 | 2012-07-25 | Novel enclosing structure applicable to connection change between new pipes and old pipes and construction method thereof |
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| CN201210260368.2A CN102758443B (en) | 2012-07-25 | 2012-07-25 | Novel enclosing structure applicable to connection change between new pipes and old pipes and construction method thereof |
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| CN102758443B true CN102758443B (en) | 2015-04-01 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105274979A (en) * | 2015-10-12 | 2016-01-27 | 上海市基础工程集团有限公司 | Construction method for treating foundation of lower soil body through forming holes in existing structure |
| CN106837343B (en) * | 2016-12-16 | 2019-03-01 | 上海市政建设有限公司 | Push pipe goes out the construction method of hole second consolidation |
| CN108442382B (en) * | 2018-03-06 | 2020-06-16 | 中铁十一局集团城市轨道工程有限公司 | In-situ protection and enclosure soil-retaining structure for pressure pipeline crossing deep foundation pit and construction method |
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| JP2001159136A (en) * | 1999-12-03 | 2001-06-12 | Asahi Glass Co Ltd | Waterproof construction method of earth-retaining wall surface |
| CN101463605A (en) * | 2007-12-18 | 2009-06-24 | 上海市第五建筑有限公司 | New and old enclosures combined foundation pit enclosure method |
| CN101550692A (en) * | 2009-05-05 | 2009-10-07 | 上海隧道工程股份有限公司 | Constructing method for reinforcing mixing stake around built shield tunnel |
| CN101725147A (en) * | 2009-11-27 | 2010-06-09 | 上海隧道工程股份有限公司 | Construction process of first-inserting last-jetting type steel churning pile enclosing structure under low net space |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020071725A1 (en) * | 2000-12-07 | 2002-06-13 | Jakiel Robert L. | Earth support and permanent structural foundation wall |
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| JP2001159136A (en) * | 1999-12-03 | 2001-06-12 | Asahi Glass Co Ltd | Waterproof construction method of earth-retaining wall surface |
| CN101463605A (en) * | 2007-12-18 | 2009-06-24 | 上海市第五建筑有限公司 | New and old enclosures combined foundation pit enclosure method |
| CN101550692A (en) * | 2009-05-05 | 2009-10-07 | 上海隧道工程股份有限公司 | Constructing method for reinforcing mixing stake around built shield tunnel |
| CN101725147A (en) * | 2009-11-27 | 2010-06-09 | 上海隧道工程股份有限公司 | Construction process of first-inserting last-jetting type steel churning pile enclosing structure under low net space |
Non-Patent Citations (3)
| Title |
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| MJS工法原理及在城市工程建设中的应用;王道富;《城市建设理论研究》;20120331(第8期);全文 * |
| 大口径新老排水管道连接技术的探讨;李玲琳等;《建筑施工》;20070130;第29卷(第1期);全文 * |
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Effective date of registration: 20151209 Address after: 200232 Shanghai city Xuhui District Wanping Road No. 1099 5 floor Patentee after: Shanghai Tunnel Engineering Co., Ltd. Patentee after: Shanghai Tunnel Engineering Co., Ltd. Address before: 200082 No. 118, Dalian Road, Shanghai, Yangpu District Patentee before: Shanghai Tunnel Engineering Co., Ltd. |