CN1641114A - Method for constructing deep-large foundation pit over operating tunnel an ddeformation-preventing strucutre - Google Patents

Method for constructing deep-large foundation pit over operating tunnel an ddeformation-preventing strucutre Download PDF

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Publication number
CN1641114A
CN1641114A CN 200410015918 CN200410015918A CN1641114A CN 1641114 A CN1641114 A CN 1641114A CN 200410015918 CN200410015918 CN 200410015918 CN 200410015918 A CN200410015918 A CN 200410015918A CN 1641114 A CN1641114 A CN 1641114A
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China
Prior art keywords
tunnel
construction
base plate
soil
preloading
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CN 200410015918
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Chinese (zh)
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CN1288308C (en
Inventor
彭敏
徐正良
邵理中
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上海市城市建设设计研究院
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Publication of CN1641114A publication Critical patent/CN1641114A/en
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Abstract

A method about deep and big hole construction above conveyance tunnel and the structure distorting prevention, the deep and big hole used for the underground engineering construction above the conveyance tunnel zone. The method includes the following step: 1) establish at least one line of anti-pull stake in two side of soil of conveyance tunnel in the construction areas; 2)Beginning above that conveyance tunnel; 3) dig the soil to meet the anti-pull stakes, place or sprinkle to build the structure scaleboard between the row of anti-pull stakes, the valid conjunction of the structure scaleboard and anti-pull stake. This construction method and structure used to defends transforming, keeping the surroundings soils from return to play transforming and the tunnel transform caused by the load which caused by digging the soil above the tunnel availability, guaranteed the safety of tunnel conveyance without a break.

Description

A kind of method and anti-deformation structure of above operation tunnel, carrying out the deep big foundation pit construction
Technical field
The present invention relates to a kind of operation tunnel top deep big foundation pit job practices, for example carry out the job practices of deep big foundation pit construction and assurance tunnel safety at the operated subway tunnel upper.
Background technology
The development of urban construction, driven the construction of the underground space, the underground space of present all kinds of purposes has obtained development and use in each metropolis, the world, as grade separation and other various underground public utilities under the open cut section of underground parking, subterranean commercial area, underground warehouse, underground civil defence fortification, cross-river tunnel, the city, the quantity and the scale of underground engineering construction project increase rapidly; Meanwhile, entered since 21 century, track traffic since its have fast, advantage such as environmental protection, capacity are huge and become the public transit facility of many big and medium-sized cities first-selection gradually.The development of the synchronous high-speed of base pit engineering and track traffic makes engineering interface face increasing problem of carrying out extensive foundation pit construction at the tunnel upper of building track traffic.
Excavation pit above established tunnel will inevitably cause the rebound deformation of cheating the subsoil body, and the distortion of the soil body also will cause the distortion that is embedded in the tunnel in the soil body.When tunnel deformation surpasses certain limit; gently then cause tunnel leak; heavy then cause influencing the tragedy of railcar safe operation even car crash; so the subway tunnel in the operation is quite strict to the requirement of distortion; for example according to " Shanghai City subway building operations along the line protection subway technical management temporary provisions ", various unloadings and loading activity influence limit and must meet subway tunnel: the radius of curvature R 〉=15000m of structure of the subway facility absolute settlement amount and horizontal displacement≤20mm, tunnel deformation curve, relative crooked≤1/2500.How to take practicable technology in work progress, the rebound deformation in control tunnel is guaranteed the safety of subway tunnel, has become the key that can this class construction activities successful.
Because the subway tunnel that has built up and runed is extremely strict to the requirement of distortion, and engineering bound pair distortion how effectively to control operation tunnel at present lacks perspective and systemic, engineering measure is so lack specific aim, the distortion in tunnel is difficult to be controlled in the above-mentioned pertinent regulations institute restricted portion, so the class engineering often must be carried out, carry out this type of construction to build grade separation and other various underground public utilities under the city with regard to almost being difficult to after the tunnel operation before the tunnel operation.Given this, the modern urban construction need badly a kind of brand-new, system, effectively control the construction technology of tunnel deformation, make the operation of established tunnel be in safety, controllable state.
Summary of the invention
The present invention is directed to the deep big foundation pit that carries out at the operated subway tunnel upper existing foregoing problems of constructing; provide a kind of and both can definitely protect operation tunnel; guarantee its safety and operation incessantly; can carry out the method for deep big foundation pit construction again above it simultaneously; thereby, guarantee the smooth implementation of engineering for underground construction provides technical guarantee system general, system.
Another object of the present invention also is to provide a kind of operation tunnel that prevents to carry out deep big foundation pit construction deformed configurations because of its top, this structure can prevent the surrounding soil and the tunnel deformation that cause because of the tunnel upper soil excavation effectively, guarantees the safety of operation tunnel and uninterrupted operation.
For this reason, the invention provides a kind of method of carrying out the deep big foundation pit construction above operation tunnel, described deep big foundation pit is used for the construction of underground construction, and described underground construction is positioned at described operation tunnel top; Said method comprising the steps of:
(1) in the operation tunnel soil at both sides in construction operation district, respectively sets a row or multi-row uplift pile;
(2) above the described operation tunnel between the described resistance to plucking row of piles, carry out soil excavation;
(3) when soil excavation when exposing described uplift pile, between described resistance to plucking row of piles, place or the pouring structure base plate, described structure base plate is connected with described each uplift pile respectively.
Preferably, described uplift pile forms with deep-mixed pile interpolation shaped steel method (SMW) construction, and described shaped steel is H shaped steel.
Preferably, carry out a ground stabilization step before or with it simultaneously, the peripheral foundation soil body employing biliquid delamination pour slurry and the three shaft mechanical pore-forming deep-mixed pile reinforcing method of described operation tunnel are reinforced in described step (1).
Preferably, described step (2) and (3) can adopt the block construction method to construct, the construction area that is about to described operation tunnel top vertically is divided into polylith along the tunnel, excavate each piece soil body successively, after a soil excavation is finished, insert or build described structure base plate in limited time, described structure base plate effectively is connected with described each uplift pile; Wherein, piecemeal quantity can determine excavation area to come exactness by real-time monitoring works surrounding buildings malformation situation.
Preferably, when adopting the block construction method, after each piece construction is finished, comprise a preloading step, described preloading step is included in the load of banking up on the described structure base plate to offset the part unloading springback capacity in cut the earth caused unloading effect and tunnel; Wherein preloading quantity can be decided by monitoring the tunnel deformation situation in real time, after whole described structure base plate is finished or after whole described underground construction is finished, removes described preloading.
On the other hand, a kind ofly carry out deep big foundation pit construction deformed configurations because of its top according to the invention provides by the formed operation tunnel that prevents of preceding method, described structure comprises the row's uplift pile that is arranged on each side of operation tunnel, cross-over connection has the structure base plate between described resistance to plucking row of piles, and described structure base plate and described uplift pile effectively link together.
Preferably, described uplift pile forms with deep-mixed pile interpolation shaped steel method (SMW) construction, and described shaped steel is H shaped steel.
Preferably, the load of having banked up on the described structure base plate, described load are steel or sandbag or concrete piece, are used to offset the part unloading springback capacity in the unloading effect that causes because of shoveling and tunnel.
Description of drawings
Below, in conjunction with the accompanying drawings deep big foundation pit job practices of the present invention is reached the operation tunnel anti-deformation structure that method constituted thus and be described further.In the accompanying drawing:
Fig. 1 a, 1b are the underground interchange of being constructed by job practices of the present invention and the graph of a relation of its below operation tunnel;
Fig. 2 is the operation tunnel anti-deformation structure section figure that is formed by job practices of the present invention;
Fig. 3 represents adoptable block construction step signal flow diagram in the job practices of the present invention;
Fig. 4 represents the structure that adoptable block construction step is constituted in the job practices of the present invention; And
Fig. 5 represents adoptable preloading construction sequence in the job practices of the present invention.
The specific embodiment
As Fig. 1 a, shown in the 1b, there is shown for example operation tunnel R of underground installation such as subway, operation tunnel has uplink tunnel R1 and downlink tunnel R2 generally speaking.The underground interchange engineering N of required construction is positioned at the top of operation tunnel R.In order to build this underground engineering, must above operation tunnel R, excavate deep big foundation pit, simultaneously because the tunnel has dropped into formal operation, the tunnel and must guarantee the wherein safe passing of the vehicles of can not arbitrarily stopping using.
Because the excavation of deep big foundation pit, will inevitably cause the rebound deformation of hole subsoil body, the distortion of the soil body also will cause the distortion that is embedded in the operation tunnel in its below soil body, when tunnel deformation surpasses to a certain degree, gently then cause tunnel leak, heavy then cause influencing the safe operation of railcar, more serious even tragedy that car crash can take place.For avoiding this situation, the method that the present invention has adopted a kind of operation tunnel top of novelty to carry out the deep big foundation pit construction.As Fig. 2-shown in Figure 5, at first, in the soil at both sides of operation tunnel R, respectively set row's uplift pile 1, setting uplift pile can adopt the less deep-mixed pile interpolation shaped steel method (being SMW worker's method) of peripheral soil disturbance is carried out, promptly in the soil body, set earlier deep-mixed pile and (original state weak soil and curing compound (being generally cement) are mixed into cement and native mixed pulp by force with mixer, pour in the stake by guniting drilling bit during piling), before the mixed pulp sclerosis, shaped steel 11 is inserted in the agitation pile.In one embodiment, the agitation pile diameter is that 850 millimeters, length are 26 meters, and interpolation shaped steel HM-500 * 11 * 15, length are 25 meters, shaped steel level interval 1.2-1.8 rice.The quantity of uplift pile can be set as the case may be, and the spacing of uplift pile has determined the level interval of shaped steel.
Subsequently, between tunnel upper, two row's uplift piles, excavate the soil body, until exposing uplift pile 1, at this moment, adopt steel concrete to water and build up a structure base plate 2, this structure base plate 2 is connected across in the uplift pile 1 of both sides, tunnel, and the anchor bar by wherein links together with shaped steel in two relative uplift piles 1, this kind connection can be the welding of described anchor bar and described shaped steel, also can be to make a call to a connecting hole in described shaped steel upper end, described anchor bar passes described connecting hole and effectively is connected with shaped steel.Like this; by structure base plate 2 and uplift pile 1 the both sides of operation tunnel and above constitute an anti-tunnel deformation structure; this structure has limited the distortion of tunnel and its peripheral soil body as a pipe protection " hoop ", thereby has avoided the tunnel below soil body because imbalance of pressure and tunnel deformation that resilience causes.
In another embodiment of job practices of the present invention, each parallel setting is arranged uplift piles 1 more in the soil at both sides of operation tunnel R, structure base plate 2 is connected across in the uplift pile 1 of both sides, tunnel, and the anchor bar by wherein links together with shaped steel in the relative many uplift piles 1, and this kind connection is passed described connecting hole and effectively is connected with shaped steel and forms by make a call to a connecting hole, described anchor bar in described shaped steel upper end.By said method, can further improve the intensity of described anti-tunnel deformation structure, limited the distortion of tunnel and its peripheral soil body more effectively.
In the practice of job practices of the present invention, can also increase the ground stabilization step according to the soil body situation of job site, before setting uplift pile or simultaneously promptly, according to the actual conditions of operation tunnel, its peripheral soil body is carried out ground stabilization, strengthen the ability of peripheral soil body resistance to deformation.Ground stabilization can be adopted several different methods, and for example, can adopt influences the less biliquid delamination pour slurry and the deep-mixed pile reinforcing method of three shaft mechanical pore-formings to subway tunnel.Particularly, in the 0.5 meter scope in limit, tunnel, adopt water glass to add cement biliquid delamination pour slurry reinforcing method, the outer deep-mixed pile reinforcing method that adopts three mixer pore-formings of the 0.5 meter scope in the outside, tunnel, the requirement of ground stabilization is by adding 28 days unconfined compression strength q of solid U28Weigh, i.e. q U28〉=1.2MPa.
In the practice of job practices of the present invention, when operation tunnel top needs the area of excavation big, if disposablely as stated above all excavate then may still be difficult to control the distortion of operation tunnel.Therefore, when above-mentioned soil excavation, take the method for block construction, specifically as shown in Figure 3 and Figure 4.Dotted line is represented operation tunnel R among Fig. 3, along the length direction in tunnel, the foundation ditch of required excavation is divided into some I-V, carry out one earlier successively, after an excavation is finished, promptly carry out the arrangement of structure base plate or build, and be connected the final piecemeal excavation structure that constitutes as shown in Figure 4 with uplift pile.This block construction method can adopt the stressing conditions of the real-time monitoring works surrounding buildings of information-aided construction method structure to determine every excavation area, after each piece soil excavation is finished, places in limited time or pouring structure base plate 2.
In addition, in order further to offset because of the caused unloading effect of cutting the earth, offset tunnel part off-load springback capacity, after placement or pouring structure base plate 2, heap adds load 3 on this structure base plate, and these load 3 can be sandbag, steel, concrete piece etc., and piling height and density can adopt the information-aided construction method to monitor the tunnel deformation situation in real time and decide, as highly being 2-3 rice, density is 3-5MPa.This preloading step is effective especially for the situation of block construction.Preloading can be removed as required or remove after whole underground construction is finished after the total base plate form and reaches certain intensity.
Adopt deep big foundation pit excavation construction and formed thus operation tunnel anti-deformation structure that said method of the present invention carried out, can control operation tunnel effectively, guarantee the safety of operation tunnel because of the distortion that its top soil excavation causes.For example; adopt job practices of the present invention that the maximum rebound deformation of running tunnel is controlled between 12.25 millimeters (downlink)-17.5 millimeter (uplink), can satisfy the requirement of " Shanghai City subway building operations protection along the line subway technical management temporary provisions " fully.
Abovely just the anti-deformation structure of job practices of the present invention and formation is described in detail in conjunction with preferable enforcement.But for the those of ordinary skill of present technique field; obviously can understand foregoing description without limits to protection scope of the present invention; for example; in connotation scope of the present invention, can carry out multiple combination to abovementioned steps, and these combinations will fall within the scope of protection of the present invention all according to the actual conditions of job site.

Claims (9)

1. one kind is carried out the process that deep big foundation pit is constructed above operation tunnel, and described deep big foundation pit is used for the construction of underground construction, and described underground construction is positioned at described operation tunnel top; It is characterized in that, said method comprising the steps of:
(1) in the operation tunnel soil at both sides in construction operation district, respectively sets at least one row's uplift pile;
(2) above the described operation tunnel between the described resistance to plucking row of piles, carry out soil excavation;
(3) when soil excavation when exposing described uplift pile, between described resistance to plucking row of piles, place or the pouring structure base plate, described structure base plate is connected with described each uplift pile respectively.
2. job practices as claimed in claim 1 is characterized in that, described uplift pile forms with deep-mixed pile interpolation shaped steel method (SMW) construction, and described shaped steel is H shaped steel.
3. job practices as claimed in claim 1, it is characterized in that, carry out a ground stabilization step before or with it simultaneously in described step (1), the peripheral foundation soil body employing biliquid delamination pour slurry and the three shaft mechanical pore-forming deep-mixed pile reinforcing method of described operation tunnel are reinforced.
4. as claim 1 or 3 described job practicess, it is characterized in that, described step (2) and (3) can adopt the block construction method to construct, be about to described operation tunnel and be divided into polylith, excavate each piece soil body successively, after a soil excavation is finished, insert or build described structure base plate in limited time, described structure base plate is connected with described each uplift pile respectively; Wherein, piecemeal quantity can determine excavation area to come exactness by real-time monitoring works surrounding buildings structure stress situation.
5. as claim 1 or 3 described job practicess, it is characterized in that, also comprise a preloading step afterwards in step (3), described preloading step is included in the load of banking up on the described structure base plate to offset the part unloading springback capacity in cut the earth caused unloading effect and tunnel; Wherein preloading quantity can be decided by monitoring the tunnel deformation situation in real time, after whole described structure base plate is finished and reached certain intensity or after whole described underground construction is finished, removes described preloading.
6. job practices as claimed in claim 4, it is characterized in that, after each piece construction is finished, comprise a preloading step, described preloading step is included in the load of banking up on the described structure base plate to offset the part unloading springback capacity in cut the earth caused unloading effect and tunnel; Wherein preloading quantity can decide by real-time monitoring tunnel deformation situation, afterwards or after whole described underground construction is finished, removes described preloading after whole described structure base plate is finished and reached certain intensity.
7. one kind is carried out deep big foundation pit construction deformed configurations by the formed operation tunnel that prevents of the described method of claim 1 because of its top, it is characterized in that, described structure comprises at least one row's uplift pile that is arranged on each side of operation tunnel, cross-over connection has the structure base plate between described resistance to plucking row of piles, and described structure base plate and described uplift pile link together.
8. structure as claimed in claim 7, it is characterized in that, described uplift pile forms with deep-mixed pile interpolation shaped steel method (SMW) construction, described shaped steel is the H shaped steel that the upper end has connecting hole, be equipped with anchor bar in the described structure base plate, the described connecting hole that described anchor bar passes described shaped steel upper end makes described structure base plate effectively be connected with described uplift pile.
9. structure as claimed in claim 7 is characterized in that, the load of having banked up on the described structure base plate, described load are steel or sandbag or concrete piece, is used to offset the part unloading springback capacity in the unloading effect that causes because of shoveling and tunnel.
CN 200410015918 2004-01-17 2004-01-17 Method for constructing deep-large foundation pit over operating tunnel an ddeformation-preventing strucutre CN1288308C (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102102521A (en) * 2010-12-29 2011-06-22 上海浦东工程建设管理有限公司 Method for broadening and rebuilding soft soil shallow tunnel in operation state
CN1837506B (en) * 2006-04-12 2012-02-15 上海市政工程设计研究总院 Construction method for excavating box-shape structure over an operating tunnel
CN101408024B (en) * 2008-11-11 2012-05-30 广州市设计院 Undercrossing subway tunnel pit supporting and protecting structure of high-rise building or super high-rise building
CN103590405A (en) * 2013-10-25 2014-02-19 上海建工四建集团有限公司 Foundation pit construction method
CN104532849A (en) * 2014-12-25 2015-04-22 重庆大学 Excavation method for foundation pit above operation railway tunnel
CN104594920A (en) * 2014-11-28 2015-05-06 浙江省建筑设计研究院 Method and device for preventing tunnel from floating
WO2016192320A1 (en) * 2015-06-03 2016-12-08 中铁第四勘察设计院集团有限公司 Continuous beam type anti-floating structure of shield tunnel
CN106638732A (en) * 2017-01-11 2017-05-10 中铁第四勘察设计院集团有限公司 Underground foundation pile pipe-roof support structure and construction method thereof
CN108360532A (en) * 2018-03-10 2018-08-03 浙江海北勘察股份有限公司 The construction method that Soft Deep Foundation Pit is gone along with sb. to guard him with SMW engineering method stake cantilevers
CN108517871A (en) * 2018-03-15 2018-09-11 大连交通大学 A kind of control excavation of foundation pit induces the structure and its construction method of tunnel upward floating
CN108589741A (en) * 2018-06-07 2018-09-28 深圳市市政设计研究院有限公司 Across the well formula excavation method of underground existing buildings on a kind of
CN110424398A (en) * 2019-07-03 2019-11-08 中铁一局集团厦门建设工程有限公司 Across existing shield section open-cut engineering method in zero distance
CN110593308A (en) * 2019-08-16 2019-12-20 浙江交工集团股份有限公司 Open excavation back pressure construction method for foundation pit of overhead operation subway underground comprehensive pipe gallery

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* Cited by examiner, † Cited by third party
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CN104675406B (en) * 2015-01-06 2016-04-06 济南轨道交通集团有限公司 A kind of stake cavity construction method of underground construction
CN104895122B (en) * 2015-06-03 2018-01-02 中铁第四勘察设计院集团有限公司 A kind of construction method of shield tunnel

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1837506B (en) * 2006-04-12 2012-02-15 上海市政工程设计研究总院 Construction method for excavating box-shape structure over an operating tunnel
CN101408024B (en) * 2008-11-11 2012-05-30 广州市设计院 Undercrossing subway tunnel pit supporting and protecting structure of high-rise building or super high-rise building
CN102102521A (en) * 2010-12-29 2011-06-22 上海浦东工程建设管理有限公司 Method for broadening and rebuilding soft soil shallow tunnel in operation state
CN102102521B (en) * 2010-12-29 2012-11-28 上海浦东工程建设管理有限公司 Method for broadening and rebuilding soft soil shallow tunnel in operation state
CN103590405A (en) * 2013-10-25 2014-02-19 上海建工四建集团有限公司 Foundation pit construction method
CN104594920A (en) * 2014-11-28 2015-05-06 浙江省建筑设计研究院 Method and device for preventing tunnel from floating
CN104594920B (en) * 2014-11-28 2016-08-24 浙江省建筑设计研究院 Prevent the method and device of tunnel upward floating
CN104532849A (en) * 2014-12-25 2015-04-22 重庆大学 Excavation method for foundation pit above operation railway tunnel
WO2016192320A1 (en) * 2015-06-03 2016-12-08 中铁第四勘察设计院集团有限公司 Continuous beam type anti-floating structure of shield tunnel
CN106638732A (en) * 2017-01-11 2017-05-10 中铁第四勘察设计院集团有限公司 Underground foundation pile pipe-roof support structure and construction method thereof
CN108360532A (en) * 2018-03-10 2018-08-03 浙江海北勘察股份有限公司 The construction method that Soft Deep Foundation Pit is gone along with sb. to guard him with SMW engineering method stake cantilevers
CN108360532B (en) * 2018-03-10 2021-03-30 浙江海北勘察股份有限公司 Construction method of SMW construction method pile cantilever enclosure for foundation pit in soft soil area
CN108517871A (en) * 2018-03-15 2018-09-11 大连交通大学 A kind of control excavation of foundation pit induces the structure and its construction method of tunnel upward floating
CN108589741A (en) * 2018-06-07 2018-09-28 深圳市市政设计研究院有限公司 Across the well formula excavation method of underground existing buildings on a kind of
CN110424398A (en) * 2019-07-03 2019-11-08 中铁一局集团厦门建设工程有限公司 Across existing shield section open-cut engineering method in zero distance
CN110593308A (en) * 2019-08-16 2019-12-20 浙江交工集团股份有限公司 Open excavation back pressure construction method for foundation pit of overhead operation subway underground comprehensive pipe gallery
CN110593308B (en) * 2019-08-16 2021-05-18 浙江交工集团股份有限公司 Open excavation back pressure construction method for foundation pit of overhead operation subway underground comprehensive pipe gallery

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