CN105714833A - Construction method of steel plate pile open caisson support - Google Patents
Construction method of steel plate pile open caisson support Download PDFInfo
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- CN105714833A CN105714833A CN201610115841.6A CN201610115841A CN105714833A CN 105714833 A CN105714833 A CN 105714833A CN 201610115841 A CN201610115841 A CN 201610115841A CN 105714833 A CN105714833 A CN 105714833A
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- sheet pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
Abstract
The invention provides a construction method of a steel plate pile open caisson support. Steel plate piles are creatively applied to open caisson construction, the steel plate piles serve as a one part of an open caisson, and the application range of the open caisson is expanded. The method comprises following steps: firstly, a stirring pile machine carries out stirring on the underground, soil is stirred to be loose, the steel plate piles are inserted into the soil which is stirred to be loose, and the steel plate piles are locked to form a steel plate pile wall; secondly, foundation pit excavation and surrounding purlin assemblage are carried out in the area defined by the steel plate pile wall, foundation pit excavation and surrounding purlin mounting are alternatively carried out, and when the downward distance between the bottom face of a foundation pit and the lower end face of the steel plate piles ranges from 2 meters to 4 meters, foundation pit excavation is suspended; thirdly, a reinforced concrete tube structure is arranged on the top of the steel plate pile wall in a cast-in-place manner, and the reinforced concrete tube structure and the steel plate pile wall are in lap joint; and fourthly, the weight needed by sinking of the steel plate pile open caisson is configured on the reinforced concrete tube structure, the steel plate pile open caisson sinks to the designed sinking depth of the open caisson, and excavation of the foundation pit and surrounding purlin mounting are completed.
Description
Technical field
The invention belongs to the construction method of the supporting of underground structure, belong to building field, be specifically related to the construction method of a kind of steel sheet pile open caisson supporting.
Background technology
Open caisson is a kind of common method of Construction of Deep Foundation, it is characterized in: will be located in the building of underground certain depth basis or structures, first make more than ground, form a tubular structure, then constantly cut the earth in cylinder, progressively sink by the deadweight of well body, after sinking to predetermined design absolute altitude, carry out back cover, construct the components such as an inner bottom plating, beam, top board, ultimately form a underground structure or structures.
The advantage that open caisson has uniqueness in construction: floor space is little, it is not necessary to supporting construction, and compared with heavy excavation, shoveling amount is little, and the impact closing on building is little, easy to operate, it is not necessary to special professional equipment.Through continuously improving, the construction technology of open caisson and construction equipment have had very big improvement, in order to reduce borehole wall side frictional resistance in open caisson construction process, and the methods such as method of calming the anger after occurring in that sludge lubricant cover method, wall.In intensive groups of building during construction, in order to ensure the safety of underground utilities and building, occur in that " boring suction soil Open caisson construction technology " and " central island-type sinking construction technique ".The appearance of these construction technologies can make earth's surface only produce only small sedimentation and displacement, but it is too much to there is also working procedure, and construction technology is complex, and technology requires height, the problems such as quality control requirement is tight.
In open caisson, due to the compressive property that circular open caisson is good, and the disturbance of the surrounding soil body is also little compared with rectangular open caisson, and the application of circular open caisson is wanted extensively in rectangular open caisson.But, the shortcoming of circular open caisson is also apparent from, owing in open caisson outside wall surface, the frictional resistance of soil is relatively big, especially when open caisson planar dimension is less, submergence depth is bigger, when face soil is solid again, its top is likely to be clamped by the soil body so that it is bottom is unsettled, it is easy to cause borehole wall drawing crack, therefore, circular open caisson be typically in burying deep or soil property loosely when use.
In order to reduce penetration resistance, the cutting shoe of blade-like is generally all made in the borehole wall bottom of open caisson, the function of cutting shoe is to reduce penetration resistance, in order to prevent cutting shoe in sinking watching to be damaged, will according to well sinking time the soft or hard degree of passed through soil layer and cutting shoe unit length on counter-force size determine, generally the tread width of cutting shoe is set to 10～30cm.
But, these improve and still fail to make the advantage of open caisson to play completely, especially when level of ground water is higher, due to the cutting shoe of open caisson can not arrange oversize, underground reservoir cannot be carried out effective sealing, need to use other pile body with water stopping function instead as pattern foundation pit supporting structure, in foundation ditch, then carry out the construction of hypogee.
Summary of the invention
For solving the problems referred to above, the present invention proposes the construction method of a kind of steel sheet pile open caisson supporting, creative is applied in open caisson construction by steel sheet pile, using the steel sheet pile part as open caisson, expands the range of application of open caisson.
The construction method of pattern foundation pit supporting structure of the present invention, has following steps:
(1) stirring to underground with mixing pile machine, soil is stirred pine, insert steel sheet pile in the soil stirring pine, steel sheet pile is mutually locked formation steel sheet-pile wall；Mixing pile machine is the special equipment making cement mixing method, in this application, only for soil is stirred pine, in the course of the work, and not gunite；
(2) carrying out excavation of foundation pit in the enclosed region of steel sheet-pile wall and purlin is enclosed in assembling, excavation of foundation pit and the installation enclosing purlin hocket, and when 2～4 meters, the lower surface of the downward distance steel sheet pile in the bottom surface of foundation ditch, suspend excavation of foundation pit；
(3) at steel sheet-pile wall top cast-in-situ steel reinforced concrete cylinder, armored concrete cylinder and steel sheet-pile wall overlap, and form steel sheet pile open caisson；
(4) on armored concrete cylinder, configure the weight needed for steel sheet pile well sinking, by steel sheet pile well sinking to its design submergence depth, and complete the excavation of foundation ditch and enclose the installation of purlin.
In the present invention, steel sheet pile is combined with armored concrete cylinder, form a kind of new open caisson, for convenience of describing, referred to as steel sheet pile open caisson, the top of steel sheet pile open caisson is reinforced concrete structure, bottom is steel sheet pile, and steel sheet pile not only plays the effect of cutting shoe, but also due to steel sheet pile can in depth under, underground reservoir is carried out sealing effectively, plays the effect of water-stop curtain.
At present, the pile sinking mode of steel sheet pile mainly has hammering method, vibratory drilling method or static pressure method, hammering method and vibratory drilling method when construction, and noise and vibration are relatively big, and environmental pollution is relatively big, is not suitable for constructing in city and dense population areas；Though static pressure method low noise and low vibration, it is suitable only for softer soil property, and when the pile sinking degree of depth of steel sheet pile is deep, the engineering time adopting static pressure method is longer, inefficient, therefore at present, main method when hammering method and vibratory drilling method steel sheet pile construction.
For avoiding adopting hammering method and the noise brought during vibratory drilling method pile sinking and larger vibration, noise when the application have employed mode that mixing pile machine loosens the soil in advance to reduce steel sheet pile pile sinking and vibration；In the application, the construction of steel sheet pile open caisson is divided into two steps, the first step: with mixing pile machine, soil is stirred pine, is then inserted by steel sheet pile in the soil stirring pine, and steel sheet pile relies on own wt or completes the sinking in soil under less pressure；Second step: at the top pouring armored concrete cylinder of the steel sheet-pile wall that steel sheet pile is formed, complete the making of steel sheet pile open caisson, then on armored concrete cylinder, the weight needed for steel sheet pile well sinking is configured, by steel sheet pile well sinking to its design submergence depth.
Owing to the weight of armored concrete cylinder is relatively big, make steel sheet pile open caisson possess traditional open caisson has from great, be conducive to the advantage sunk and the advantage that bigger external pressure can be born.Along with the progressively excavation of foundation ditch, the pressure of the foundation pit side-wall soil body also can be increasing, and armored concrete cylinder utilizes advantage that the good rigidly self having, shear strength are high to resist the pressure of the foundation pit side-wall soil body.
In the sinking watching of typical round open caisson, when the well sinking degree of depth is relatively big, face soil more closely knit again time, its top is likely to be clamped by the soil body so that it is bottom is unsettled, it is easy to cause borehole wall drawing crack.In this application, when steel sheet pile open caisson is set to circle, owing in advance soil being stirred pine, in the sinking watching of steel sheet pile open caisson, the phenomenon that steel sheet pile open caisson is clamped by the soil body will not be there is, and surrounding soil is more uniform with pressure ratio to the frictional force of steel sheet pile open caisson, steel sheet pile open caisson is few run-off the straight phenomenon in sinking watching, even if there is slight tilt phenomenon, the inclination correcting steel sheet pile open caisson is relatively easy to, and which ensure that the sinking precision of steel sheet pile open caisson.
In the work progress of mixing pile machine, can sand oarse-grained in soil or gravel soil and the like be crushed, it is to avoid steel sheet pile runs into bigger resistance in sinking watching, it is ensured that stability when steel sheet pile sinks in soil and safety simultaneously.
In this application, it is divided into two steps corresponding with steel sheet pile open caisson construction, the excavation of foundation ditch is also classified into two steps, and the first step is after the sinking that steel sheet pile completes in the soil stirring pine, and foundation ditch is carried out part excavation, temporarily retain the part soil body in foundation ditch, to keep the soil body to the compressing of steel sheet pile and fixation, it is ensured that the safe construction of supporting, it is to avoid all after excavation, the lower end of steel sheet pile, in abandoned situation, produces the situations such as bending, deformation；Second step is in the cast completing armored concrete cylinder, after forming steel sheet pile open caisson, with the sinking of steel sheet pile open caisson, completes the excavation to foundation ditch.Foundation ditch is carried out part excavation, it is possible to decrease the soil body frictional resistance to steel sheet pile open caisson, the weight of steel sheet pile well sinking required configuration is greatly reduced, improves efficiency of construction.After the foundation ditch part completing the first step is excavated, 2～4 meters, the lower surface of the bottom surface downward distance steel sheet pile of foundation ditch is relatively reasonable, steel sheet pile can be formed effective constraint by the soil body 2～4 meters thick, will not produce the situations such as bending, deformation, make whole supporting be in safely controllable under.
To overlap between armored concrete cylinder and steel sheet-pile wall, armored concrete cylinder is made to become as a whole with steel sheet-pile wall, steel sheet pile open caisson could be formed, if having gap between armored concrete cylinder and steel sheet-pile wall, the soil body or water body outside supporting can enter in foundation ditch by this gap, long-pending soil or hydrops in foundation ditch increase, and cause difficulty of construction to increase；By the overlap joint of armored concrete cylinder Yu steel sheet-pile wall, the upper end still preventing part steel sheet pile produces flexural deformation under the pressure of the soil body, and makes supporting lose efficacy.
Part excavation is carried out at foundation ditch, and purlin is enclosed in assembling in digging process, steel sheet pile is connected as a whole with enclosing purlin, prevent in digging process, under the pressure of the outer soil body of foundation ditch, part steel sheet pile is deformed, the even accident such as inefficacy, installs in time and encloses purlin and ensure that the safety of supporting construction carries out.
In the whole digging process of foundation ditch; installing in time according to designing requirement and to enclose purlin, the excavation of foundation ditch and the installation enclosing purlin need to hocket, in Excavation Process; after purlin installation site is enclosed in arrival; suspend foundation ditch excavation, will enclose purlin install put in place after, continuation foundation ditch excavation; after when arrival, next encloses purlin installation site; again stopping the excavation of foundation ditch, and carry out enclosing the installation of purlin, so circulation is until completing the excavation of foundation ditch and enclosing the installation of purlin.Avoid once by excessive for the degree of depth of excavation of foundation pit, and produce unnecessary potential safety hazard；Steel sheet pile is under the pressure of the outside soil body of foundation ditch and water body, and along with the increase of the excavation of foundation pit degree of depth, this pressure also can rapid increase, very easily making steel sheet pile produce distortion, deformation, time serious, steel sheet pile will produce bending, supporting is made to collapse, enclose the timely installation of purlin, can effectively limit steel sheet-pile deformation, keep the stability of supporting construction.
After steel sheet pile open caisson completes, the top end face of armored concrete cylinder can slightly below ground, in order to top adds cover plate, and the top end face of armored concrete cylinder is 0.3～1.0 meter lower than the highly preferred of ground.
Describing in order to convenient, will be called, by the region that be stirred the soil of pine, the band that loosens the soil, the band that loosens the soil has certain width, and along the edge ring of foundation ditch around, the width the be with total height preferably over steel sheet pile of loosening the soil.In order to avoid steel sheet pile encounters the soil not stirring pine in sinking watching, optimum selection is, big 100～350 millimeters of the thickness of the steel sheet-pile wall that the width of the band that loosens the soil is formed after being mutually locked than steel sheet pile.
At present, the pile sinking mode of steel sheet pile is generally: be first bolted together in advance by several piece steel sheet pile, adjacent steel sheet pile is interlocked by both sides fore shaft, form a screen, then make as a whole to carry out pile sinking by the steel sheet pile forming screen, this pile-driving method is referred to as screen-type piling, and screen-type piling can accelerate the pile sinking degree of depth of steel sheet pile, also can ensure that the precision of stake to greatest extent；But adopt screen-type piling to have one disadvantage in that, it is exactly when supporting is for time circular, the screen that several piece steel sheet pile is formed upon connection to have a radian, this radian to be consistent with the radian of supporting, but in actual engineering, the radian of screen often has little deviation with the radian of supporting, in order to prevent above-mentioned little deviation from making steel sheet pile cannot successfully sink to the degree of depth of regulation, or produce in sinking watching, make to loosen the soil big 100～350 millimeters of the thickness of width ratio steel sheet-pile wall of band, it is ensured that steel sheet pile successfully sinks.
The soil body for ensureing below foundation ditch bottom surface is not affected by the disturbance of blender, make the soil body still in previous status, to ensure that steel sheet pile is had enough holding powers by the soil body, the bosom that mixing pile machine stirs to underground is desirable to be higher than the designed elevation 0.5～1.5 meter of foundation ditch bottom surface.
The lap of splice of armored concrete cylinder and steel sheet-pile wall is for being preferably 0.3～0.8 meter.The lap of splice can meet most designing requirement within the scope of 0.3～0.8 meter, and the too small meeting of the lap of splice makes bonding strength not enough, and the lap of splice is long only can increase construction cost, more whole supporting will not be increased safety coefficient.
In this application, when armored concrete cylinder configures the weight needed for steel sheet pile well sinking, at least it is divided into twice configuration, after completing configuration and the steel sheet pile well sinking of weight every time, continue the excavation of foundation ditch and enclose the installation of purlin, until completing the sinking of steel sheet pile open caisson, and the excavation of foundation ditch and enclose the installation of purlin.This method repeatedly configuring weight so that minimum counterweight can be adopted to carry out the sinking of steel sheet pile open caisson；In Excavation Process, along with in foundation ditch, the soil body is constantly cut out, the chucking power of steel sheet pile open caisson is reduced by the soil body, steel sheet pile open caisson can produce certain sinking under the effect of deadweight and configuration weight, operation in foundation ditch can be caused certain danger by this, simultaneously it is also possible that the submergence depth of steel sheet pile open caisson departs from control, gradation configuration weight, the submergence depth of steel sheet pile open caisson can be controlled with comparalive ease within the scope of tolerance.
The thickness of armored concrete cylinder is preferably 0.3～0.8 meter, and this thickness range can ensure the construction needs of agent structure.
When construction, it is desirable to selecting to adopt three axes agitating pile machine, the feature that three axes agitating pile facility effective percentage is high, its efficiency generally can reach 5～8 times of biaxial rneader, adopt three axes agitating pile machine can be effectively improved working performance.
In the present invention, the construction equipment adopted is the equipment of low vibration, low noise, on the basis that ensure that construction quality, also reduces produced noise and vibration in steel sheet pile construction process to greatest extent, has reached the effect of civilized construction.
Accompanying drawing explanation
Fig. 1 adopts the present invention to carry out in the process constructed, and soil is stirred pine by mixing pile machine, and inserts the structural representation after steel sheet pile in the soil stirring pine.
Fig. 2 completes foundation ditch part excavation on the basis of Fig. 1 and installs the structural representation sketch after enclosing purlin.
Fig. 3 completes armored concrete cylinder to build on the basis of Fig. 2, forms the structural representation sketch after steel sheet pile open caisson.
Fig. 4 is the sinking completing steel sheet pile open caisson on the basis of Fig. 3, and completes excavation of foundation pit and all enclose the structural representation sketch after purlin installs.
Fig. 5 is the structural representation sketch after completing the construction of foundation ditch inner bottom plating on the basis of Fig. 4.
Fig. 6 is the top view of Fig. 4.
Fig. 7 is the enlarged drawing of G part in Fig. 6.
Labelling in figure:
2. armored concrete cylinder, 3. steel sheet pile, 4. steel bracket, 5. reinforced concrete fortifield village purlin, 6. base plate, 10. ground,
11. foundation ditch completes bottom surface, the medial surface of 13. steel sheet-pile walls, the lateral surface of 14. steel sheet-pile walls,
A. design of foundation pit cutting depth, the height of B. steel sheet-pile wall,
C. the lap of splice of armored concrete cylinder and steel sheet-pile wall, the thickness of E. steel sheet-pile wall,
F. the height of armored concrete cylinder, the design submergence depth of H. steel sheet pile open caisson.
Detailed description of the invention
Below in conjunction with concrete hypogee structure, the invention will be further described, in the present embodiment, to be constructed an is storehouse circularly, storehouse, ground adopts steel sheet pile open caisson as supporting, the internal diameter of the armored concrete cylinder of its Steel Sheet Pile open caisson is 20 meters, design of foundation pit cutting depth 16 meters, the design submergence depth of steel sheet pile open caisson 19.5 meters, steel sheet pile 3 adopts U-shaped steel sheet pile and the bracket steel sheet pile of 400*170, and bracket steel sheet pile adopts the U-shaped steel sheet pile of 400*170 and steel bracket to make in advance and standby；U-shaped steel sheet pile is identical with the length of bracket steel sheet pile, is 15 meters, and the height of the steel sheet-pile wall being made up of steel sheet pile 3 is also 15 meters；The degree of depth that mixing pile machine stirs to underground is 15 meters；Enclosing purlin adopts spiced by steel reinforced concrete formula to enclose purlin, encloses purlin spacing 2.5 meters, and stake machine adopts three axes agitating pile machine；The pile sinking of steel sheet pile 3 adopts screen-type piling；In the accompanying drawings, labelling 10 represents ground.
In the present embodiment, bracket steel sheet pile is on the lateral surface of the web that steel bracket 4 is welded on U-shaped steel sheet pile, and the bearing-surface of steel bracket 4 is vertical with the length direction of U-shaped steel sheet pile, and every piece of bracket steel sheet pile is welded with 4 pieces of steel brackets.
Above-mentioned storehouse circularly adopts what the present invention carried out building to specifically comprise the following steps that
(1) Fig. 1 is consulted, stir to underground with mixing pile machine, soil is stirred pine, then being inserted in the soil stirring pine by steel sheet pile 3, in the present embodiment, the design of foundation pit cutting depth in storehouse is 16 meters circularly, the degree of depth that mixing pile machine stirs to underground is 15 meters, higher than the designed elevation 1 meter of foundation ditch bottom surface, with ensure excavation of foundation pit complete after the soil body at steel sheet pile 3 place place be not affected by the disturbance of mixing pile machine so that steel sheet pile 3 is had enough holding powers by the soil body.
Steel sheet pile 3 is mutually locked the conglobate steel sheet-pile wall of shape；Described steel sheet pile 3 includes U-shaped steel sheet pile and bracket steel sheet pile.
In the present embodiment, bracket steel sheet pile adopts U-shaped steel sheet pile and steel bracket 4 to make in advance；Make bracket steel sheet pile in advance, it can be carried out perfect quality testing, to ensure the installation strength of steel bracket, it is to avoid when carrying out installing steel bracket at the scene, it is impossible to carry out the drawback of total quality detection；Certainly, if condition is restricted, it is also possible to by all U-shaped steel sheet piles, include after the U-shaped steel sheet pile made used by bracket steel sheet pile is fully completed sinking, then with excavation of foundation pit, steel bracket is arranged on corresponding U-shaped steel sheet pile.
(2) Fig. 2 is consulted, excavation of foundation pit is carried out in the enclosed region of steel sheet-pile wall, after digging down 12 meters, stopping excavation, the part soil body retained in foundation ditch does not temporarily dig, to keep the stake lower end of steel sheet pile 3 is had enough pressure, avoid after all having excavated, the lower end of steel sheet pile 3, under the pressure of the outside soil body of foundation ditch, bends in foundation ditch, makes supporting lose efficacy.
In Excavation Process, install at any time and enclose purlin, at the present embodiment, enclose purlin and adopt reinforced concrete fortifield village purlin 5, owing to the present embodiment is circular configuration, reinforced concrete fortifield village purlin 5 adopts spiced by steel reinforced concrete formula to enclose purlin, namely enclose purlin to be spliced by prefabricated armored concrete purlin, adopt spiced by steel reinforced concrete formula to enclose purlin and can improve speed of application, in the installation process of reinforced concrete fortifield village purlin 5, pea gravel concreten to be poured into a mould between the joint of armored concrete purlin and reinforced concrete fortifield village purlin 5 and steel sheet-pile wall inwall.
(3) consulting Fig. 3, at the steel sheet pile coping cast-in-situ steel reinforced concrete cylinder 2 that steel sheet pile 3 is constituted, armored concrete cylinder 2 and steel sheet-pile wall overlap, and form steel sheet pile open caisson；Armored concrete cylinder 2 is highly 5 meters, thickness is 0.4 meter, and its lap of splice with steel sheet-pile wall is 0.5 meter.
(4) consult Fig. 4, armored concrete cylinder 2 configures the weight needed for steel sheet pile well sinking, make steel sheet pile well sinking design submergence depth 19.5 meters to it；And complete the excavation of foundation ditch and enclose the installation of purlin, after steel sheet pile open caisson completes, the top end face of armored concrete cylinder 2 is concordant with ground 10.
In Fig. 4, labelling 11 represents that foundation ditch completes bottom surface, i.e. the bottom surface of foundation ditch complete design cutting depth.
In the present embodiment, it is divided into weight needed for twice configuration steel sheet pile well sinking, first time completes weight and configures and after steel sheet pile well sinking, continue foundation ditch is excavated downwards 2 meters, then second time weight configuration is completed, make steel sheet pile well sinking to its design submergence depth 19.5 meters, subsequently complete the cutting depth of foundation ditch 16 meters.In the digging process of foundation ditch, it is performed continuously over the installation of reinforced concrete fortifield village purlin 5.
In the present embodiment, when casting reinforced concrete cylinder, synchronize pre-buried steel bracket 4 on the inwall of armored concrete cylinder 2, during to avoid the later stage to install steel bracket, need armored concrete cylinder 2 is holed or cuts a hole wall, this not only adds unnecessary work, sometimes can't ensure the installation quality of steel bracket.
In Fig. 4, A represents design of foundation pit cutting depth, and B represents the height of steel sheet-pile wall, and C represents the lap of splice of armored concrete cylinder and steel sheet-pile wall, and F represents the height of armored concrete cylinder, and H represents the design submergence depth of steel sheet pile open caisson；In the present embodiment, A is 16 meters, and B is 15 meters, and C is 0.5 meter, and F is 5 meters, and H is 19.5 meters.
(5) consulting Fig. 5, after completing excavation of foundation pit, continue the succeeding body construction in storehouse circularly, Fig. 5 is the structural representation sketch after foundation ditch inner bottom plating 6 completes construction, and steel sheet pile open caisson therein is rounded.
Consult Fig. 6, Fig. 6 has been the structural representation sketch after excavation of foundation pit and the purlin installation of reinforced concrete fortifield village, local G enlarged drawing in Fig. 6 is Fig. 7, in the figure 7, it is mutually twisted including the steel sheet pile 3 of U-shaped steel sheet pile and bracket steel sheet pile and connects into steel sheet-pile wall, labelling 13 represents the medial surface of steel sheet-pile wall, and labelling 14 represents the lateral surface of steel sheet-pile wall；E represents the thickness of steel sheet-pile wall, i.e. distance between medial surface and the lateral surface of steel sheet-pile wall.In this enforcement, the thickness of steel sheet-pile wall is 340 millimeters；Clear in order to represent, only show the profile formed after soil is stirred pine by one group of three axes agitating pile machine in the figure 7, and represent with labelling 20, in the present embodiment, the width of the band that loosens the soil that three axes agitating pile machine is stirred pine is 650 millimeters, will big 310 millimeters of the thickness of relatively steel sheet-pile wall, the smooth pile sinking after being effectively guaranteed in construction monolithic steel sheet pile and steel sheet pile being connected into screen.
At present, mixing pile machine mainly has Double shaft stirring stake machine and two kinds of three axes agitating pile machine, high efficiency due to three axes agitating pile machine, three axes agitating pile machine forms the trend replacing Double shaft stirring stake machine, therefore in the present embodiment, preferentially have employed three axes agitating pile machine to construct, to ensure the efficient of engineering construction progress.
In this embodiment, the steel bracket of the bracket steel sheet pile adopted is welded on the lateral surface of web of U-shaped steel sheet pile, and according to the actual needs, steel bracket can also be welded on the medial surface of the web of U-shaped steel sheet pile.According to concrete construction requirement, steel sheet pile can also adopt hat shape steel sheet pile, and makes bracket steel sheet pile with hat shape steel sheet pile.
The steel sheet pile of composition steel sheet-pile wall can adopt single steel sheet pile, it would however also be possible to employ the combination of multiple steel sheet pile uses.
In the present embodiment, the top end face of armored concrete cylinder is concordant with ground.According to different needs, after steel sheet pile open caisson completes, the top end face of armored concrete cylinder may be lower than 0.3～1.0 meter of ground, and adds cover plate at an upper portion thereof.
Claims (10)
1. the construction method of a steel sheet pile open caisson supporting, it is characterised in that there are following steps:
(1) stirring to underground with mixing pile machine, soil is stirred pine, insert steel sheet pile in the soil stirring pine, steel sheet pile is mutually locked formation steel sheet-pile wall；
(2) carrying out excavation of foundation pit in the enclosed region of steel sheet-pile wall and purlin is enclosed in assembling, excavation of foundation pit and the installation enclosing purlin hocket, and when 2～4 meters, the lower surface of the downward distance steel sheet pile in the bottom surface of foundation ditch, suspend excavation of foundation pit；
(3) at steel sheet-pile wall top cast-in-situ steel reinforced concrete cylinder, armored concrete cylinder and steel sheet-pile wall overlap, and form steel sheet pile open caisson；
(4) on armored concrete cylinder, configure the weight needed for steel sheet pile well sinking, by steel sheet pile well sinking to its design submergence depth, and complete the excavation of foundation ditch and enclose the installation of purlin.
2. construction method according to claim 1, it is characterised in that the bosom that mixing pile machine stirs to underground is higher than the designed elevation 0.5～1.5 meter of foundation ditch bottom surface.
3. construction method according to claim 1, it is characterised in that the lap of splice of armored concrete cylinder and steel sheet-pile wall is 0.3～0.8 meter.
4. construction method according to claim 1, it is characterized in that, in step (5), be at least divided into the weight needed for twice configuration steel sheet pile well sinking, after completing configuration and the steel sheet pile well sinking of weight every time, continue the excavation of foundation ditch and enclose the installation of purlin.
5. construction method according to claim 1, it is characterised in that the thickness of armored concrete cylinder is 0.3～0.8 meter.
6. construction method according to claim 1, it is characterized in that, described steel sheet pile includes bracket steel sheet pile, described bracket steel sheet pile is be made on the side of the web that steel bracket is fixed on U-shaped steel sheet pile or hat shape steel sheet pile, and the bearing-surface of steel bracket is vertical with the length direction of steel sheet pile.
7. construction method according to claim 1, it is characterised in that described in enclose purlin be the reinforced concrete fortifield village purlin being spliced by prefabricated armored concrete purlin.
8. construction method according to claim 1, it is characterised in that when casting reinforced concrete cylinder, synchronizes pre-buried steel bracket on the inwall of armored concrete cylinder.
9. construction method according to claim 1, it is characterised in that described steel sheet pile open caisson is rounded.
10. construction method according to claims 1 to 9, it is characterised in that described mixing pile machine is three axes agitating pile machine.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106480890A (en) * | 2016-12-06 | 2017-03-08 | 马鞍山瑞马钢构材料有限公司 | The construction method of steel sheet pile deep basal pit and stiff baseplate settler used |
| CN106948353A (en) * | 2017-05-03 | 2017-07-14 | 中交第二航务工程局有限公司 | A kind of deep water combined steel plate pile cofferdam construction method |
| CN107313435A (en) * | 2017-07-05 | 2017-11-03 | 中铁十局集团第五工程有限公司 | Deep Water Ultra-long steel sheet pile cofferdam construction method |
| RU179256U1 (en) * | 2017-09-12 | 2018-05-07 | Левицкий Валерий Павлович | Reusable lowering well from a profiled sheet for the installation of buried reinforced concrete foundations |
| CN108360897A (en) * | 2018-02-07 | 2018-08-03 | 中国二十冶集团有限公司 | The processing method of mud and drift sand enriching area wash mill |
| CN109183781A (en) * | 2018-11-08 | 2019-01-11 | 大连大学 | A kind of Z-shape steel sheet pilebraced cuts structure with bent cap |
| CN109826630A (en) * | 2019-02-02 | 2019-05-31 | 上海城建水务工程有限公司 | A kind of precast concrete open caisson device and its construction method for jacking construction |
| CN110863505A (en) * | 2019-12-03 | 2020-03-06 | 广州市市政集团有限公司 | Open caisson suitable for geological conditions of deep water-rich sand layer |
| CN113186942A (en) * | 2021-05-11 | 2021-07-30 | 中建八局第一建设有限公司 | Pipe jacking well enclosure structure and excavation construction method |
| CN114855824A (en) * | 2022-06-08 | 2022-08-05 | 浙江国进建设有限公司 | Construction method of Larsen steel sheet pile of foundation pit |
| CN115045299A (en) * | 2022-07-26 | 2022-09-13 | 杭州市西站枢纽开发有限公司 | Deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106480890A (en) * | 2016-12-06 | 2017-03-08 | 马鞍山瑞马钢构材料有限公司 | The construction method of steel sheet pile deep basal pit and stiff baseplate settler used |
| CN106480890B (en) * | 2016-12-06 | 2018-07-27 | 马鞍山瑞马钢构材料有限公司 | The construction method of steel sheet pile deep basal pit and stiff baseplate settler used |
| CN106948353A (en) * | 2017-05-03 | 2017-07-14 | 中交第二航务工程局有限公司 | A kind of deep water combined steel plate pile cofferdam construction method |
| CN107313435A (en) * | 2017-07-05 | 2017-11-03 | 中铁十局集团第五工程有限公司 | Deep Water Ultra-long steel sheet pile cofferdam construction method |
| RU179256U1 (en) * | 2017-09-12 | 2018-05-07 | Левицкий Валерий Павлович | Reusable lowering well from a profiled sheet for the installation of buried reinforced concrete foundations |
| CN108360897A (en) * | 2018-02-07 | 2018-08-03 | 中国二十冶集团有限公司 | The processing method of mud and drift sand enriching area wash mill |
| CN109183781A (en) * | 2018-11-08 | 2019-01-11 | 大连大学 | A kind of Z-shape steel sheet pilebraced cuts structure with bent cap |
| CN109183781B (en) * | 2018-11-08 | 2024-02-09 | 大连大学 | Z-shaped steel sheet pile enclosure structure with bent cap |
| CN109826630A (en) * | 2019-02-02 | 2019-05-31 | 上海城建水务工程有限公司 | A kind of precast concrete open caisson device and its construction method for jacking construction |
| CN109826630B (en) * | 2019-02-02 | 2024-04-09 | 上海城建水务工程有限公司 | Precast concrete open caisson device for pipe jacking construction and construction method thereof |
| CN110863505A (en) * | 2019-12-03 | 2020-03-06 | 广州市市政集团有限公司 | Open caisson suitable for geological conditions of deep water-rich sand layer |
| CN113186942A (en) * | 2021-05-11 | 2021-07-30 | 中建八局第一建设有限公司 | Pipe jacking well enclosure structure and excavation construction method |
| CN114855824A (en) * | 2022-06-08 | 2022-08-05 | 浙江国进建设有限公司 | Construction method of Larsen steel sheet pile of foundation pit |
| CN115045299A (en) * | 2022-07-26 | 2022-09-13 | 杭州市西站枢纽开发有限公司 | Deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method |
| CN115045299B (en) * | 2022-07-26 | 2024-02-02 | 杭州市西站枢纽开发有限公司 | Deep foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method |
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