CN107059904A - A kind of underground pipe gallery ponding well excavation method - Google Patents

A kind of underground pipe gallery ponding well excavation method Download PDF

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Publication number
CN107059904A
CN107059904A CN201710163640.8A CN201710163640A CN107059904A CN 107059904 A CN107059904 A CN 107059904A CN 201710163640 A CN201710163640 A CN 201710163640A CN 107059904 A CN107059904 A CN 107059904A
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CN
China
Prior art keywords
open caisson
ponding well
ponding
well
pipe gallery
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CN201710163640.8A
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Chinese (zh)
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CN107059904B (en
Inventor
谭福生
常杰
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China Huaye Group Co Ltd
North China Metallurgical Construction Engineering Construction Co Ltd
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China Huaye Group Co Ltd
North China Metallurgical Construction Engineering Construction Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/22Lining sumps in trenches or other foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water

Abstract

The present invention provides a kind of underground pipe gallery ponding well excavation method, comprises the following steps:Open caisson is made according to the size of ponding well, and open caisson is placed on the design attitude of ponding well vertically, wherein, open caisson is the pit shaft do not closed up and down, open caisson and the ponding well coaxial placement;Ponding well is excavated, until well sinking designs the lower surface of the borehole wall to the lower surface of caisson wall less than ponding well;After confirming open caisson without sinkage, in open caisson bottom casting concrete bed course;Using caisson wall as external mold, internal model is installed in open caisson, ponding well is poured.The present invention excavates underground pipe gallery ponding well using open caisson auxiliary, and open caisson forms mobile sand block wall during excavation, ensures construction quality;Open caisson inwall can directly do exterior waterproof coating simultaneously, it is not necessary to casting concrete bed course again, reduce shoveling amount and concrete cushion amount, reduce construction cost;Also, the borehole wall of open caisson is as the external mold of plash, the step of installing external mold in routine techniques is eliminated, efficiency of construction is improved.

Description

A kind of underground pipe gallery ponding well excavation method
Technical field
The present invention relates to the realm of building construction, specifically, it is related to a kind of underground pipe gallery ponding well excavation method.
Background technology
Urban Underground piping lane is to build a tunnel space in Urban Underground, by electric power, communication, combustion gas, heat supply, plumbing It is integrated in one etc. various utilities pipelines, provided with special access hole, hoisting port and monitoring system, implements unified planning, uniformly sets Meter, unified construction and management, are the important infrastructures for ensureing city operations.In underground pipe gallery construction, various complicated geologicals Under the conditions of earth excavation quantities is big, difficulty of construction is high, excavate 2m~3m ponding especially in the bottom plate of piping lane downwards again Level of ground water is reduced to below ponding well by well, earth excavation, is wanted water level dropping to 3m or so under bottom plate and is not easy to, i.e., Water level is set to be reduced to 3m or so under bottom plate, in case of drift sand then can inwardly cave in, the ponding well borehole wall is difficult to be molded, therefore ponding well construction Just turn into whole engineering restraining factors.Conventional practice is exactly slope open cut, prevents quicksand from caving in by slope.Traditional slope open cut Construction technology is as shown in figure 1, first heavy excavation exceedes the depth of ponding well 9, and is cheated in the outer deeper casual water of excavation of ponding well 9 8, then with slush pump 7 by casual water cheat 8 in water sand pump to settling zone.By the thick stones of the underlay 300mm of ponding well 9~500mm Son, is split into floral tube with electric welding by DN150 or so steel pipe (not shown), is then packed tightly with Dense mesh screen, as water accumulation pipe, by ponding One end of pipe is buried in stone layer, in the other end access casual water hole 8 of water accumulation pipe, by underground water water conservancy diversion to casual water Hole 8, wait underground water outside it is drained finish after, formwork pours blinding concrete 6, makees to install internal model, external mold after waterproof, assembling reinforcement, It is synchronous with underplate concrete 5 to pour ponding well concrete 5, form ponding well 9.Conventional method complex process, excavated volume is big, by product The time of water discharge is long, and fill concrete amount is big, costly, and it is difficult shaping to meet drift sand formation, causes the whole piping lane duration delayed, and And later stage seepage possibility is big.
The content of the invention
To solve the problem of conventional method excavates ponding well complex process, costly, excavation and big concrete backfill amount, this Invention excavates underground pipe gallery ponding well using open caisson auxiliary, and open caisson forms mobile sand block wall during excavation, prevents quicksand from entering, and protects Hinder construction quality;Open caisson inwall can directly do exterior waterproof coating simultaneously, it is not necessary to casting concrete bed course again, reduce shoveling amount and Concrete cushion amount, reduces construction cost;Also, the borehole wall of open caisson is eliminated in routine techniques as the external mold of plash The step of installing external mold, improves efficiency of construction.
A kind of underground pipe gallery ponding well excavation method, comprises the following steps:Open caisson is made according to the design size of ponding well, And open caisson is placed on to the top of the design attitude of ponding well vertically, wherein, the open caisson is the pit shaft do not closed up and down, described Open caisson and the ponding well coaxial placement;Ponding well is excavated, until well sinking is less than ponding well to the lower surface of caisson wall Design the lower surface of the borehole wall;After confirming open caisson without sinkage, in open caisson bottom casting concrete bed course;Open caisson internal water accumulation is taken out Discharge;Using the borehole wall of open caisson as external mold, internal model is installed in open caisson, and pours bottom surface and the side wall of ponding well, so as to be made Ponding well.
Preferably, the step of excavating ponding well includes:Using manually or mechanically excavation soil before underground water is not run into Side;After underground water is run into, silt particle is penetrated using water jet punching, slurry is formed, and pump the slurry to ground using slush pump Face.
Preferably, during casting concrete bed course, concrete is not vibrated.
Preferably, after open caisson internal water accumulation pump drainage is gone out check concrete cushion whether seepage, if any seepage, to seepage Place installs internal model again after being blocked.
Preferably, well sinking deflection is corrected using cushion block.
Preferably, if certain side sinking of open caisson is too fast, with one or more cushion block pads in certain side borehole wall Bottom surface, slows down the subsidence velocity of certain side.
Preferably, if certain side sinking of open caisson is too fast, stop penetrating high-pressure water jet to a certain side blow, slow down institute State the subsidence velocity of certain side.
Preferably, the thickness of the concrete cushion is 300mm~500mm.
Preferably, concrete cushion includes multiple reinforced mesh.
Preferably, the inside cross-section size of open caisson is more than the inside cross-section size of ponding well.
Brief description of the drawings
By the way that embodiment is described with reference to accompanying drawings below, features described above of the invention and technological merit will become More understand and be readily appreciated that.
Fig. 1 is the schematic diagram for representing ponding well conventional construction method;
Fig. 2 is the schematic diagram for representing the method that the use water jet of the embodiment of the present invention accelerates open caisson to decline;
Fig. 3 is the structural representation for the ponding well for representing the embodiment of the present invention;
Fig. 4 is the cross-sectional view of the underground pipe gallery for the instantiation for representing the embodiment of the present invention.
Embodiment
The embodiment of underground pipe gallery ponding well excavation method of the present invention described below with reference to the accompanying drawings.This area Those of ordinary skill will recognize, without departing from the spirit and scope of the present invention, can be with a variety of Mode or its combination are modified to described embodiment.Therefore, accompanying drawing and description are inherently illustrative, rather than For limiting scope of the claims.In addition, in this manual, accompanying drawing is drawn not in scale, and identical accompanying drawing Mark represents identical part.
Underground pipe gallery ponding well is the pit shaft extended vertically downwards from piping lane bottom plate, in underground pipe gallery construction, is first needed Excavate to form piping lane bottom plate, then excavation forms ponding well downwards from piping lane bottom plate.Fig. 2 is the use for representing the embodiment of the present invention Water jet accelerates the schematic diagram of the method for open caisson decline;Fig. 3 is the structural representation for the ponding well for representing the embodiment of the present invention.Ginseng According to Fig. 2-3, the ponding well excavation method comprises the following steps:
First, open caisson 10 is made according to the size of design ponding well 11, the open caisson 10 is the pit shaft that column is not closed up and down. Open caisson 10 can be made by the way of concreting.But the present embodiment is not intended to limit the making material of open caisson 10, open caisson 10 can also be made of the material such as steel or armored concrete.Open caisson 10 is placed on to the design position of ponding well 11 vertically Put, and make it that open caisson 10 and ponding well 11 are coaxial.After being sunk in place due to open caisson 10, open caisson 10 will be used as the outer of ponding well 11 Mould, installs internal model (not shown) again in open caisson 10, and ponding well 11 is poured between internal model and external mold.Therefore, open caisson 10 is interior Side cross sectional dimensions should be more than the inside cross-section size of ponding well 11.For example, rectangle is in open caisson cross section, then open caisson Length and width should be correspondingly greater than the length and width of ponding well 11, and open caisson cross section is circular, then the internal diameter of open caisson should be greater than ponding well 11 internal diameter.
Then, ponding well 11 is excavated, is cut the earth from inside to outside from open caisson 10, can be with excavated by manual work before underground water is not run into Pick, soil is outwards lifted using hoist engine, or can also be using machinery excavation.After underground water is run into, then using giant 15 into open caisson 10 punching penetrate high-pressure water jet, water and silt particle are mixed into slurry 17, and using slush pump 16 by open caisson 10 Slurry 17 is pumped to ground settling zone, can accelerate the subsidence velocity of open caisson 10.Due to the barrier of open caisson 10, open caisson 10 can be prevented The silt particle in outside caves in the inner side of open caisson 10, and open caisson 10 forms the sand block wall of movement, prevents quicksand from entering.As silt particle does not stop to mix Outer row is closed, open caisson 10 gradually sinks in place.It is so-called to sink to referring to that the borehole wall lower surface of open caisson 10 be less than the ponding designed in place The lower surface of the borehole wall of well 11, so as to be casting concrete bed course and ponding shaft bottom layer slot milling.After open caisson 10 sinks in place Observation for a period of time, such as checks whether open caisson 10 also has sinkage in 24 hours, until the position of open caisson 10 immobilizes.
Then, it is determined that after the transfixion of open caisson 10, using water-proof concrete casting concrete bed course 101, due to open caisson 10 It is interior to also have ponding, therefore do not vibrated when casting concrete, one-time-concreting is completed, because vibrated concrete can be from water Analysis, causes cement mortar to be lost in, can influence the intensity of concrete.
Finally, the ponding in open caisson 10 is pumped to ground, pours ponding well 11, i.e., with concreting ponding well 11 Shaft bottom face 111 and the borehole wall 112, open caisson 10 install internal model (not shown), and colligation steel as the external mold of ponding well in open caisson 10 Muscle 113, is poured, you can complete pouring for ponding well 11.
There is no the explanation for describing to be conserved after concreting in above description.Meeting after actually usual concreting Maintenance 3 days~5 days, curing time is determined depending on weather condition, and winter, spring length are a little, and summer, autumn are shorter.
The present embodiment excavates underground pipe gallery ponding well using open caisson auxiliary, and open caisson forms mobile sand block wall during excavation, prevents Fluid stopping sand enters, and ensures construction quality;Open caisson inwall can directly do exterior waterproof coating simultaneously, it is not necessary to casting concrete bed course again, Shoveling amount and concrete cushion amount are reduced, construction cost is reduced;Also, the borehole wall of open caisson is as the external mold of plash, save The step of installing external mold in routine techniques has been omited, efficiency of construction is improved.
In one alternate embodiment, inclination may be produced in the sinking watching of open caisson 10, therefore need to observed at any time, in time Correction.If certain side sinking of open caisson 10 is too fast, stops penetrating high-pressure water jet to the side blow, slow down the lower settling velocity of the side Degree.
In one alternate embodiment, if certain side sinking of open caisson 10 is too fast, one or more cushion blocks can also be used The side borehole wall bottom surface that (not shown) pad sinks fast in open caisson 10, plays the heavy effect of resistance, when both sides deflection is identical, then will pad Block is withdrawn from.Cushion block can be using flitch common in construction.
In one alternate embodiment, seepage is checked whether after casting concrete bed course 101, and pour again after carrying out leak stopping Ponding well.Extensive infiltration is then blocked with powdery sealing agent, the slight infiltration then leak stopping by the way of bored grouting.
Illustrated referring to Fig. 4 with instantiation, Fig. 4 is the instantiation for the underground pipe gallery for representing the embodiment of the present invention Cross-sectional view.Certain underground pipe gallery is three chamber structures, including electric storehouse 1, hydro-thermal storehouse 2, combustion gas storehouse 3.The size in three storehouses is identical, Wall thickness is 350mm outside storehouse, and interior wall thickness is 300mm, and clear height is 2.7m, and top plate, the thickness of bottom plate are 400mm.The bottom plate in combustion gas storehouse 3 with Under have length × wide × depth be 1.8m × 1.8m × 2.2m ponding well 11, the wall thickness 400mm of ponding well 11, bottom plate thickness 500mm.Root According to the size of ponding well 11, the net scale modest ability × wide × depth for determining the inner side of open caisson 10 is 2.6m × 2.6m × 3.0m~3.2m, And corresponding bottom concrete bed course thickness is about 300mm~500mm, the wall thickness 200mm of open caisson 10.At the scene assembling reinforcement, branch After mould, reinforcing, the position of ponding well 11 is hung to crane, open caisson 10 is poured, can also set multiple in the concrete poured Such as 14 × 200mm of Φ reinforced mesh, with enhancing structure intensity.The form removal after concrete curing 2 days~5 days.Such as without underground Water can be excavated directly, and people's frock soil outwards hangs soil with electronic small winch, run into underground water and then used giant Jiang Shui and mud Slurry is penetrated into sand punching, and slurry is evacuated to ground accumulation area together with slush pump.As silt particle does not stop to stir outer row, open caisson gradually under Sink to position.The decline situation of open caisson is observed during well sinking, is rectified a deviation at any time.Observe the sinking of open caisson side too fast, just stop Certain side is penetrated in the punching of sealing power.If can't rectify a deviation, it can be played with flitch pad in the fast side borehole wall bottom surface of well sinking The heavy effect of resistance.Well sinking in place after, stop pumping, observe more than 24 hours, it is anti-using C30P6 after open caisson to be determined is static Water coagulation soil casting concrete bed course, one-time-concreting in place, does not vibrate.Concrete curing extracts ponding out in 3 days~5 days, confirms Waterproof, and assembling reinforcement, branch internal model are done after ne-leakage in open caisson 10, then can casting concrete, form ponding well 11 The borehole wall and shaft bottom face.
The present invention excavates underground pipe gallery ponding well using open caisson auxiliary, and open caisson forms mobile sand block wall during excavation, prevents Quicksand enters, and ensures construction quality;Open caisson inwall can directly do exterior waterproof coating simultaneously, it is not necessary to casting concrete bed course again, subtract Lack shoveling amount and concrete cushion amount, reduce construction cost;Also, the borehole wall of open caisson is as the external mold of plash, omit The step of installing external mold in routine techniques, improves efficiency of construction.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art For member, the present invention can have various modifications and variations.Any modification within the spirit and principles of the invention, being made, Equivalent substitution, improvement etc., should be included in the scope of the protection.

Claims (10)

1. a kind of underground pipe gallery ponding well excavation method, it is characterised in that comprise the following steps:
Open caisson is made according to the design size of ponding well, and open caisson is placed on to the top of the design attitude of ponding well vertically, its In, the open caisson is the pit shaft do not closed up and down, the open caisson and the ponding well coaxial placement;
Ponding well is excavated, until well sinking designs the lower surface of the borehole wall to the lower surface of caisson wall less than ponding well;
After confirming open caisson without sinkage, in open caisson bottom casting concrete bed course;
Open caisson internal water accumulation pump drainage is gone out;
Using the borehole wall of open caisson as external mold, internal model is installed in open caisson, and pours bottom surface and the side wall of ponding well, so that ponding is made Well.
2. underground pipe gallery ponding well excavation method according to claim 1, wherein, the step of excavating ponding well includes:
Used before underground water is not run into and manually or mechanically excavate the earthwork;
After underground water is run into, silt particle is penetrated using water jet punching, slurry is formed, and pump the slurry to ground using slush pump Face.
3. underground pipe gallery ponding well excavation method according to claim 1, wherein, during casting concrete bed course, to coagulation Soil does not vibrate.
4. underground pipe gallery ponding well excavation method according to claim 1, wherein, examined after open caisson internal water accumulation pump drainage is gone out Look into concrete cushion whether seepage, if any seepage, install internal model again after being blocked to leakage.
5. underground pipe gallery ponding well excavation method according to claim 1, wherein, well sinking is corrected using cushion block inclined Turn.
6. underground pipe gallery ponding well excavation method according to claim 5, wherein, if certain side sinking of open caisson is too fast, Then slow down the subsidence velocity of certain side in the bottom surface of certain side borehole wall with one or more cushion block pads.
7. underground pipe gallery ponding well excavation method according to claim 2, wherein, if certain side sinking of open caisson is too fast, Then stop penetrating high-pressure water jet to a certain side blow, slow down the subsidence velocity of certain side.
8. underground pipe gallery ponding well excavation method according to claim 1, wherein, the thickness of the concrete cushion is 300mm~500mm.
9. underground pipe gallery ponding well excavation method according to claim 1, wherein, concrete cushion includes multiple reinforcing bars Mesh sheet.
10. underground pipe gallery ponding well excavation method according to claim 1, wherein, the inside cross-section size of open caisson is big In the inside cross-section size of ponding well.
CN201710163640.8A 2017-03-17 2017-03-17 A kind of underground pipe gallery ponding well excavation method Active CN107059904B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107938681A (en) * 2017-11-26 2018-04-20 上海宝冶集团有限公司 Way after concrete sump
CN109853601A (en) * 2018-12-25 2019-06-07 上海城建市政工程(集团)有限公司 A kind of Yield rainfall relation method of catch pit in subway station foundation pit

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Publication number Priority date Publication date Assignee Title
JPS57130631A (en) * 1981-02-06 1982-08-13 Takenaka Komuten Co Ltd Method and apparatus for treating underground water in underground excavation work
CN203924085U (en) * 2014-07-01 2014-11-05 中铁城建集团第二工程有限公司 A kind of caisson structure that is applied to collecting well

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57130631A (en) * 1981-02-06 1982-08-13 Takenaka Komuten Co Ltd Method and apparatus for treating underground water in underground excavation work
CN203924085U (en) * 2014-07-01 2014-11-05 中铁城建集团第二工程有限公司 A kind of caisson structure that is applied to collecting well

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
杨和礼等: "《土木工程施工第3版》", 30 June 2013, 武汉大学出 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107938681A (en) * 2017-11-26 2018-04-20 上海宝冶集团有限公司 Way after concrete sump
CN109853601A (en) * 2018-12-25 2019-06-07 上海城建市政工程(集团)有限公司 A kind of Yield rainfall relation method of catch pit in subway station foundation pit
CN109853601B (en) * 2018-12-25 2020-12-29 上海城建市政工程(集团)有限公司 Water drainage method for sump in subway station foundation pit

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