CN103790163A - Construction method for overcoming insertion limitations of enclosing unit of deep foundation pit excavated in soft soil - Google Patents

Construction method for overcoming insertion limitations of enclosing unit of deep foundation pit excavated in soft soil Download PDF

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Publication number
CN103790163A
CN103790163A CN201410031442.2A CN201410031442A CN103790163A CN 103790163 A CN103790163 A CN 103790163A CN 201410031442 A CN201410031442 A CN 201410031442A CN 103790163 A CN103790163 A CN 103790163A
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CN
China
Prior art keywords
guard
unit
along
foundation pit
foundation ditch
Prior art date
Application number
CN201410031442.2A
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Chinese (zh)
Inventor
曹章平
付国才
文先锋
张毅
宋锐
左冬生
Original Assignee
中铁四局集团有限公司上海分公司
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Application filed by 中铁四局集团有限公司上海分公司 filed Critical 中铁四局集团有限公司上海分公司
Priority to CN201410031442.2A priority Critical patent/CN103790163A/en
Publication of CN103790163A publication Critical patent/CN103790163A/en

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Abstract

The invention provides a construction method for overcoming insertion limitations of an enclosing unit of a deep foundation pit excavated in soft soil. The method is characterized by including at least the following steps that firstly, two separation units are arranged on the two sides of a pipeline tunnel respectively, wherein the deep foundation pit between the two separation units is a tunnel foundation pit with a pipeline; secondly, the enclosing unit is installed at the edge of the tunnel foundation pit with a pipeline between the two separation units; thirdly, an enclosing reinforced area is formed on the side, away from the tunnel foundation pit with a pipeline, of the enclosing unit; fourthly, soil, on the two sides of the tunnel foundation pit with a pipeline, in the enclosing reinforced area is reinforced; fifthly, soil in the tunnel foundation pit with a pipeline is reinforced. According to the construction method for overcoming the insertion limitations of the enclosing unit of the deep foundation pit excavated in the soft soil, the area of which the insertion ratio is low because of the enclosing unit insertion limitations caused when the existing pipeline tunnel is arranged on the foundation pit in a crossing mode is reinforced, the stability of the enclosing unit with the insertion limitations is improved, and the resistance of the bottom of the enclosing unit is improved.

Description

A kind of unit of going along with sb. to guard him for Soft Soil Foundation Pit inserts limited construction method
Technical field
The present invention relates to a kind of unit of going along with sb. to guard him for Soft Soil Foundation Pit and insert limited construction method, specifically, the unit of going along with sb. to guard him that relates to a kind of saturated muddy soft soil deep foundation ditch for being positioned at existing pipeline tunnel upper inserts limited construction method.
Background technology
In the development process of the underground space, deep-foundation pit engineering is inevitable, deep pit digging can affect the safety in building, the pipeline tunnel etc. of its periphery, reply deep foundation ditch adds bracing of foundation pit, especially on deep foundation ditch, should add bracing of foundation pit by emphasis across existing pipeline tunnel foundation ditch section, contribute to reduce the construction cost of deep foundation ditch and accelerate speed of application.
Bracing of foundation pit is mainly to bear water pressure and the soil pressure that deep pit digging removal load produces, and this pressure is delivered to support, is the one of the stablizing deep foundation ditch interim wall-retaining structure of constructing, and fender post is a kind of conventional unit of going along with sb. to guard him of bracing of foundation pit.The insertion of fender post is than referring to the length of fender post more than deep foundation ditch bottom surface and the length ratio below deep foundation ditch bottom surface.The insertion of fender post is than being to affect the safety of deep foundation ditch and the key factor of economy.
Conventionally, under the geological conditions of saturated muddy soft soil, the length of embedment of deep foundation pit fender post is limited by geological conditions, the end, hole, can not provide the pile top end build-in point of reliable solid soil layer as fender post, and, there is existing pipeline tunnel, for example electric power tunnel in the part construction location below of deep foundation ditch.For avoiding destroying the safety in pipeline tunnel, the length of embedment of fender post is restricted, and causes near the insertion of the fender post in existing pipeline tunnel than not enough.Insert and cause fender post unstable than deficiency, affect completing smoothly of deep foundation pit construction.For example, in the region across existing pipeline tunnel on deep foundation ditch, obtain by actual measurement, the excavation of foundation pit degree of depth is 5.77 m, and the fender post degree of depth is 7.5 m, and fender post embedded depth 1.73 m are about 0.3 and insert than 1.73:5.77.And the general range that inserts ratio is 0.8 ~ 1.2.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of unit of going along with sb. to guard him for Soft Soil Foundation Pit and inserts limited construction method, to on deep foundation ditch across existing pipeline tunnel cause going along with sb. to guard him unit insert limited cause insert reinforce than not enough region, can increase and insert than the stability of going along with sb. to guard him unit in not enough region, improve the resistance of going along with sb. to guard him unit bottom, while guaranteeing deep pit digging, go along with sb. to guard him the Stability Analysis of Structures of unit.
For achieving the above object, the invention provides a kind of unit of going along with sb. to guard him for Soft Soil Foundation Pit and insert limited construction method, it is characterized in that at least comprising the steps: that (a) respectively arranges one and cut off unit in the both sides in pipeline tunnel, the deep foundation ditch between two described partition unit is for containing pipeline tunnel foundation ditch; (b) the described edge containing pipeline tunnel foundation ditch between two described partition unit is installed and is gone along with sb. to guard him unit; (c) set and go along with sb. to guard him stabilization zone away from a described side containing pipeline tunnel foundation ditch in the described unit of going along with sb. to guard him; (d) reinforce containing the soil body of going along with sb. to guard him in stabilization zone described in foundation ditch both sides, pipeline tunnel described; (e) reinforce containing the soil body in pipeline tunnel foundation ditch described.
Preferably, the distance value between described partition unit and described pipeline tunnel is more than or equal to 1m.
Preferably, described partition unit adopts the block wall that bored pile is made.
Preferably, the length of going along with sb. to guard him unit described in is greater than the described length containing foundation ditch edge, pipeline tunnel between two described partition unit.
Preferably, described in, go along with sb. to guard him unit and adopt cement-soil gravity type retaining wall structure.
Preferably, described in go along with sb. to guard him stabilization zone length go along with sb. to guard him the length of unit described in being greater than, described in go along with sb. to guard him stabilization zone width be less than or equal to the described width containing pipeline tunnel foundation ditch.
Preferably, described in, go along with sb. to guard him reinforcement depth in stabilization zone with described in to go along with sb. to guard him the height of unit identical.
Preferably, the method that described reinforcing adopts is comprehensive high-pressure injection method.
In addition, preferably, be describedly more than or equal to 1m containing the bottom of back-up coat in pipeline tunnel foundation ditch and the distance on the top in described pipeline tunnel.
From above-mentioned description with put into practice, the unit of going along with sb. to guard him for Soft Soil Foundation Pit provided by the invention inserts limited construction method, two partition unit are set will be separated containing pipeline tunnel foundation ditch in deep foundation ditch, installing and going along with sb. to guard him unit containing foundation ditch edge, pipeline tunnel, two unit of going along with sb. to guard him that cut off the edge containing pipeline tunnel foundation ditch between unit insert the restriction that is subject to pipeline tunnel, below and cause to insert and limitedly cause inserting than not enough, to going along with sb. to guard him going along with sb. to guard him stabilization zone and all reinforcing containing the soil body in pipeline tunnel foundation ditch of both sides, unit, improve soil strength, reduce loosing soil degree, reduce the removable space of going along with sb. to guard him unit, avoid going along with sb. to guard him unit towards going along with sb. to guard him stabilization zone or moving containing pipeline tunnel foundation ditch direction, increase the stability of going along with sb. to guard him unit, and the reinforcement depth of going along with sb. to guard him stabilization zone is identical with the height of going along with sb. to guard him unit, can improves through the soil body of reinforcing the resistance of going along with sb. to guard him unit bottom, thereby while further guaranteeing deep pit digging, go along with sb. to guard him the Stability Analysis of Structures of unit.
Accompanying drawing explanation
By the description to embodiment below in conjunction with accompanying drawing, above-mentioned feature of the present invention and technological merit will become apparent and easily understand.In the accompanying drawings,
Fig. 1 a-1e is structural representation, and the unit of going along with sb. to guard him for Soft Soil Foundation Pit showing described in one embodiment of the present of invention inserts limited construction method;
Fig. 2 is the described flow chart of going along with sb. to guard him unit and insert limited construction method for Soft Soil Foundation Pit of one embodiment of the present of invention.
 
Reference numeral
100 pipeline tunnels; 200 containing pipeline tunnel foundation ditch;
300 non-pipeline tunnel foundation ditches; 400 go along with sb. to guard him stabilization zone;
210 cut off unit; 220 go along with sb. to guard him unit;
A district: containing foundation ditch district, pipeline tunnel; B district: foundation ditch district, non-pipeline tunnel;
C district: go along with sb. to guard him stabilization zone.
The specific embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
The unit of going along with sb. to guard him for Soft Soil Foundation Pit described in description one embodiment of the present of invention is inserted to limited construction method below.Fig. 1 a-1e is structural representation, and the unit of going along with sb. to guard him for Soft Soil Foundation Pit showing described in one embodiment of the present of invention inserts limited construction method.Fig. 2 is the described flow chart of going along with sb. to guard him unit and insert limited construction method for Soft Soil Foundation Pit of one embodiment of the present of invention.
As shown in Figure 1a, when on deep foundation ditch during across existing pipeline tunnel 100, respectively arrange one in the both sides in pipeline tunnel 100 and cut off 210, two of unit and cut off unit 210 deep foundation ditch is divided into containing pipeline tunnel foundation ditch 200 and non-pipeline tunnel foundation ditch 300.Two deep foundation ditchs that cut off between unit 210 are containing pipeline tunnel foundation ditch 200.Wherein, comprise that containing pipeline tunnel foundation ditch 200 non-pipeline tunnel foundation ditch 300 comprises B district of foundation ditch district, non-pipeline tunnel containing A district of foundation ditch district, pipeline tunnel.
Due to the Free Transform time in the engineering time decision pipeline tunnel 100 containing pipeline tunnel foundation ditch 200, so it is excessive with the distance in pipeline tunnel 100 that the position of partition unit 210 should avoid cutting off unit 210, cause the scope containing pipeline tunnel foundation ditch 200 of its division excessive, cause the engineering time long, cause the 100 Free Transform times of pipeline tunnel to increase; Should avoid again cutting off unit 210 too small with the distance in pipeline tunnel 100, cause containing the construction inconvenience in pipeline tunnel foundation ditch 200, or in work progress, destroy pipeline tunnel 100.Preferably, the distance value cutting off between unit 210 and pipeline tunnel 100 is more than or equal to 1m.In addition, preferably, cut off the block wall that unit 210 adopts bored pile to make.
As shown in Figure 1 b, install and go along with sb. to guard him unit 220 two edges containing pipeline tunnel foundation ditch 200 that cut off between unit 210.Preferably, the length of going along with sb. to guard him unit 220 is greater than two length of cutting off the edges containing pipeline tunnel foundation ditch 200 between unit 210.Preferably, go along with sb. to guard him unit and adopt cement-soil gravity type retaining wall structure.Owing to comprising pipeline tunnel 100 in this section of deep foundation ditch, go along with sb. to guard him on unit 220 across pipeline tunnel 100, in the time that unit 220 is gone along with sb. to guard him in installation, the bottom of going along with sb. to guard him unit 220 should be positioned at the top in pipeline tunnel 100.Owing to going along with sb. to guard him, the insertion of unit 220 is limited, causes it to insert than not enough.
As shown in Fig. 1 c, going along with sb. to guard him unit 220 away from setting and go along with sb. to guard him stabilization zone 400 containing a side of pipeline tunnel foundation ditch 200, respectively arrange one in the both sides that contain pipeline tunnel foundation ditch 200 and go along with sb. to guard him stabilization zone 400.Going along with sb. to guard him stabilization zone 400 comprises and goes along with sb. to guard him C district, stabilization zone.Here going along with sb. to guard him stabilization zone 400, is positioned on the bearing of trend in pipeline tunnel 100.Preferably, the length of going along with sb. to guard him stabilization zone 400 is greater than the length of going along with sb. to guard him unit 220, and the width of going along with sb. to guard him stabilization zone 400 is less than or equal to the width containing pipeline tunnel foundation ditch 200.
As shown in Figure 1 d, the soil body of going along with sb. to guard him in stabilization zone 400 containing foundation ditch 200 both sides, pipeline tunnel is reinforced.By to going along with sb. to guard him the Stabilizing Grout in C district, stabilization zone, can improve the intensity of this region soil body, increase the stability of going along with sb. to guard him unit 220, reduce the gas porosity of the soil body, reduce the mobile space of going along with sb. to guard him unit 220, avoid going along with sb. to guard him unit 220 to going along with sb. to guard him C district, stabilization zone one side shifting, and can increase the resistance of going along with sb. to guard him 220 bottoms, unit.Preferably, go along with sb. to guard him reinforcement depth in stabilization zone 400 identical with the height of going along with sb. to guard him unit 220.In addition, preferably, reinforcing the method adopting is comprehensive high-pressure injection method.
As shown in Fig. 1 e, to reinforcing containing the soil body in pipeline tunnel foundation ditch.By the Stabilizing Grout improvement to containing A district of foundation ditch district, pipeline tunnel, can improve the intensity of this region soil body, increase the stability of going along with sb. to guard him unit 220, reduce the gas porosity of the soil body, reduce the mobile space of going along with sb. to guard him unit 220, avoid going along with sb. to guard him unit 220 to containing foundation ditch district, pipeline tunnel A district one side shifting, and can increase the resistance of going along with sb. to guard him 220 bottoms, unit.Preferably, be more than or equal to 1m containing the bottom of back-up coat in pipeline tunnel foundation ditch 200 and the distance on the top in pipeline tunnel 100.Preferably, reinforcing the method adopting is comprehensive high-pressure injection method.
Insert limited construction method by the unit of going along with sb. to guard him for Soft Soil Foundation Pit described in an embodiment of the invention described above, two partition unit are set will be separated containing pipeline tunnel foundation ditch in deep foundation ditch, installing and going along with sb. to guard him unit containing foundation ditch edge, pipeline tunnel, two unit of going along with sb. to guard him that cut off the edge containing pipeline tunnel foundation ditch between unit insert the restriction that is subject to pipeline tunnel, below and cause to insert and limitedly cause inserting than not enough, to going along with sb. to guard him going along with sb. to guard him stabilization zone and all reinforcing containing the soil body in pipeline tunnel foundation ditch of both sides, unit, improve soil strength, reduce loosing soil degree, reduce the removable space of going along with sb. to guard him unit, avoid going along with sb. to guard him unit towards going along with sb. to guard him stabilization zone or moving containing pipeline tunnel foundation ditch direction, increase the stability of going along with sb. to guard him unit, and the reinforcement depth of going along with sb. to guard him stabilization zone is identical with the height of going along with sb. to guard him unit, can improves through the soil body of reinforcing the resistance of going along with sb. to guard him unit bottom, thereby while further guaranteeing deep pit digging, go along with sb. to guard him the Stability Analysis of Structures of unit.
As shown in Figure 2, for Soft Soil Foundation Pit to go along with sb. to guard him the step of inserting limited construction method in unit as follows, the first step is that the deep foundation ditch that the both sides in the pipeline tunnel 100 in deep foundation ditch respectively arrange between partition unit 210,210, two of partition unit is containing pipeline tunnel foundation ditch 200; Second step is to install and go along with sb. to guard him unit 220 at two edges containing pipeline tunnel foundation ditch 200 that cut off between unit 210, this region go along with sb. to guard him unit 220 because the pipeline tunnel 100 of below inserts limited; The 3rd step is to go along with sb. to guard him stabilization zone 400 to going along with sb. to guard him unit 220 away from the side setting containing pipeline tunnel foundation ditch 200; The 4th step is that two soil bodys of going along with sb. to guard him in stabilization zone 400 containing foundation ditch 200 both sides, pipeline tunnel are reinforced; The 5th step is to carrying out grouting and reinforcing containing the soil body in pipeline tunnel foundation ditch 100.So far, complete than the not enough construction of going along with sb. to guard him unit for inserting the limited insertion causing.
The above; be only the preferably specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any people who is familiar with this technology is in the disclosed technical scope of the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims (9)

1. insert a limited construction method for the unit of going along with sb. to guard him of Soft Soil Foundation Pit, it is characterized in that at least comprising the steps:
(a) respectively arrange one in the both sides in pipeline tunnel and cut off unit, the deep foundation ditch between two described partition unit is for containing pipeline tunnel foundation ditch;
(b) the described edge containing pipeline tunnel foundation ditch between two described partition unit is installed and is gone along with sb. to guard him unit;
(c) set and go along with sb. to guard him stabilization zone away from a described side containing pipeline tunnel foundation ditch in the described unit of going along with sb. to guard him;
(d) reinforce containing the soil body of going along with sb. to guard him in stabilization zone described in foundation ditch both sides, pipeline tunnel described;
(e) reinforce containing the soil body in pipeline tunnel foundation ditch described.
2. the unit of going along with sb. to guard him for Soft Soil Foundation Pit as claimed in claim 1 inserts limited construction method, it is characterized in that, the distance value between described partition unit and described pipeline tunnel is more than or equal to 1m.
3. the unit of going along with sb. to guard him for Soft Soil Foundation Pit as claimed in claim 1 inserts limited construction method, it is characterized in that the block wall that described partition unit adopts bored pile to make.
4. the unit of going along with sb. to guard him for Soft Soil Foundation Pit as claimed in claim 1 inserts limited construction method, it is characterized in that, described in go along with sb. to guard him unit length be greater than the described length containing foundation ditch edge, pipeline tunnel between two described partition unit.
5. the unit of going along with sb. to guard him for Soft Soil Foundation Pit as claimed in claim 1 inserts limited construction method, it is characterized in that, described in go along with sb. to guard him unit and adopt cement-soil gravity type retaining wall structure.
6. the unit of going along with sb. to guard him for Soft Soil Foundation Pit as claimed in claim 1 inserts limited construction method, it is characterized in that, described in the described length of going along with sb. to guard him stabilization zone is greater than, go along with sb. to guard him the length of unit, described in go along with sb. to guard him stabilization zone width be less than or equal to the described width containing pipeline tunnel foundation ditch.
7. the unit of going along with sb. to guard him for Soft Soil Foundation Pit as claimed in claim 1 inserts limited construction method, it is characterized in that, described in go along with sb. to guard him reinforcement depth in stabilization zone with described in to go along with sb. to guard him the height of unit identical.
8. the unit of going along with sb. to guard him for Soft Soil Foundation Pit as claimed in claim 1 inserts limited construction method, it is characterized in that, the method that described reinforcing adopts is comprehensive high-pressure injection method.
9. the unit of going along with sb. to guard him for Soft Soil Foundation Pit as claimed in claim 1 inserts limited construction method, it is characterized in that, is describedly more than or equal to 1m containing the bottom of back-up coat in pipeline tunnel foundation ditch and the distance on the top in described pipeline tunnel.
CN201410031442.2A 2014-01-23 2014-01-23 Construction method for overcoming insertion limitations of enclosing unit of deep foundation pit excavated in soft soil CN103790163A (en)

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Application Number Priority Date Filing Date Title
CN201410031442.2A CN103790163A (en) 2014-01-23 2014-01-23 Construction method for overcoming insertion limitations of enclosing unit of deep foundation pit excavated in soft soil

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CN201410031442.2A CN103790163A (en) 2014-01-23 2014-01-23 Construction method for overcoming insertion limitations of enclosing unit of deep foundation pit excavated in soft soil

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0849236A (en) * 1994-05-13 1996-02-20 Haseko Corp Sheathing construction method
CN101761068A (en) * 2009-11-10 2010-06-30 同济大学 Box-raft pressure-bearing type foundation underpinning and construction reinforcing method for tunnel across pile foundation of bridge above river
CN102127974A (en) * 2011-04-18 2011-07-20 上海现代建筑设计(集团)有限公司 Design and construction method of additional cellar under existing building
CN103321230A (en) * 2013-07-12 2013-09-25 上海隧道工程股份有限公司 Excavation method for deep and big foundation pit in long-distance crossing field for shallow-buried subway

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0849236A (en) * 1994-05-13 1996-02-20 Haseko Corp Sheathing construction method
CN101761068A (en) * 2009-11-10 2010-06-30 同济大学 Box-raft pressure-bearing type foundation underpinning and construction reinforcing method for tunnel across pile foundation of bridge above river
CN102127974A (en) * 2011-04-18 2011-07-20 上海现代建筑设计(集团)有限公司 Design and construction method of additional cellar under existing building
CN103321230A (en) * 2013-07-12 2013-09-25 上海隧道工程股份有限公司 Excavation method for deep and big foundation pit in long-distance crossing field for shallow-buried subway

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
文先锋等: "软土深基坑上跨电力隧道抗浮施工技术研究", 《城市建设理论研究(电子版)》 *

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Application publication date: 20140514