CN107083774A - Multiple-layer horizontal connects double steel sheet piling pit supporting construction and its construction method - Google Patents
Multiple-layer horizontal connects double steel sheet piling pit supporting construction and its construction method Download PDFInfo
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- CN107083774A CN107083774A CN201710252006.1A CN201710252006A CN107083774A CN 107083774 A CN107083774 A CN 107083774A CN 201710252006 A CN201710252006 A CN 201710252006A CN 107083774 A CN107083774 A CN 107083774A
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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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Abstract
Double steel sheet piling pit supporting construction and its construction method are connected the invention discloses a kind of multiple-layer horizontal, including front-seat steel sheet pile, heel row steel sheet pile, front-seat dowel crown beam, heel row dowel crown beam, stake top coupling beam, steel strand wires, enclose purlin and anchorage；Construction method is：Front and rear row steel sheet pile geometric parameter is chosen first, then construct front-seat steel sheet pile, heel row steel sheet pile, front-seat dowel crown beam, heel row dowel crown beam and stake top coupling beam, steel strand wires are passed through with foundation ditch stage excavation encloses purlin and anchorage installation, and applies prestressing force, and multiple tracks steel strand anchoring circulates this process.The steel sheet pile of the present invention can be prefabricated, with factorial praluction, and speed of production is fast, and pile quality is reliable, and it is convenient to construct, and recycles, economic and environment-friendly.Supporting construction can be while earth-retaining and sealing, front and rear row steel sheet pile formation space redundant structure is made by stake top coupling beam, level connection joint and inter-pile soil collective effect, integral rigidity increases, Internal forces and deformation can be obviously reduced, under foundation ditch Water And Earth Pressures complicated and changeable and other load actions, can the internal force of adjust automatically supporting construction in itself, be allowed to adapt to complicated and often unpredicted loading condition and deeper base pit engineering.
Description
Technical field
The present invention relates to the technical field of Geotechnical Engineering, mainly a kind of multiple-layer horizontal connects double steel sheet pile pattern foundation pit supporting structure
Structure and its construction method.
Background technology
In actual base pit engineering, in foundation ditch place, situation is limited, foundation ditch surrounding enviroment are special, execution conditions can not be met
Under the conditions of, anchor pole, soil nailing, inner support are restricted and can not implemented, and can not meet foundation pit deformation and interior using Single row pillars
The requirement of power, or in the case of substantially increasing cost using Single row pillars, Double-row Piles Support is a kind of alternative foundation ditch
Supporting construction form.
Look back in change and engineering practice that Retaining Structure with Double-row Piles was produced in this tens year till now, pass through monitoring
Many valuable Monitoring Datas are obtained, by the analysis and refinement to these data, some important achievements have been drawn simultaneously
It has accumulated rich experience.Retaining Structure with Double-row Piles has obtained a range of use and to highlight its many in Practical Project
Advantage.But, still there are some aspects to need deeper into research and improve.
Collect the country used the data of Retaining Structure with Double-row Piles to find that double-row pile system is only capable of in stake in Practical Project
Push up and connection is realized by collar tie beam and coupling beam, double-row pile is no between stake top compatibility of deformation, but the following front two rows stake of stake top to appoint
What is connected, preceding campshed and rear campshed deformation, and general preceding campshed deformation is big, and rear campshed deformation is small, it is impossible to after giving full play to
Less, bending resistance and non-deformability be not strong for the effect of campshed, the i.e. integral rigidity of two campsheds, is applicable digging and is usually no more than 9 deeply
Rice, when excavation of foundation pit depth is bigger, double-row pile can because pile body displacement and Internal forces it is excessive and no longer be applicable.Secondly, it is double
Stake supporting construction breadth depth ratio it is smaller, domestic scholars think can by row of piles away from between 8d~10d (d be stake footpath) pair
Row Piles Supporting Structure is regarded as anchor and draws Single row pillars supporting construction.But when there is the effect of a variety of additional loads, support pile is in itself
Bending rigidity and the gravity collective effect of soil, the larger Retaining Structure with Double-row Piles of breadth depth ratio should be taken as between two campsheds and stake
The combined structure of soil so that Retaining Structure with Double-row Piles can more effectively resist horizontal direction lotus in Excavation Process
Carry, traditional method can be changed as increased stake footpath or use level support system come drag of improving the standard, saving material is reached
Purpose.Therefore, multiple-layer horizontal, which connects double steel sheet pile supporting construction, to be proposed on the basis of traditional Retaining Structure with Double-row Piles
A kind of new supporting structure system.
The content of the invention
It is an object of the invention to overcome the shortcomings of that prior art is present, and provide a kind of in control Excavation Settlement and crater wall
Be substantially better than in terms of lateral displacement traditional Retaining Structure with Double-row Piles multiple-layer horizontal connect double steel sheet piling pit supporting construction and
Its construction method.
The purpose of the present invention is completed by following technical solution.This multiple-layer horizontal connects double steel sheet pile foundation ditch
Supporting construction, including front-seat steel sheet pile, heel row steel sheet pile, front-seat dowel crown beam, heel row dowel crown beam, stake top coupling beam, steel strand wires, enclose
Purlin and anchorage, preceding campshed use triangle piling bar or steel-pipe pile, and rear campshed is by H profile steel stake and draws anchoring pile to constitute；Draw anchoring pile by
H profile steel stake is welded with L-type steel pipe, and rear campshed is separately positioned on the rear campshed wing provided with lock, cloudy head lock and male lock
Edge both sides.
Position is respectively arranged with male lock outside the corresponding edge of a wing of campshed web afterwards and cloudy head is latched, and leads between rear campshed
Yin, yang head lock is crossed mutually to interlock to take and be combined.
Heel row draws anchoring pile to be welded by H profile steel stake with some L-type steel pipes, and welding position is selected on H profile steel web, and is protected
Hold L-type steel pipe horizontal segment vertical web face.
The vertical segment length of L-type steel pipe is each unequal, and the L-type steel pipe horizontal segment after being welded with H profile steel sheet pile web is in not
Same absolute altitude.
This multiple-layer horizontal of the present invention connects the construction method of double steel sheet piling pit supporting construction, including as follows
Step：
The first step：Analyzed according to site condition and calculating, it is determined that the model of front-seat steel sheet pile, stake are long, determine heel row steel plate
Stake model, stake it is long, latch length, and double-row pile array pitch, calculate steel strand wires road number, level interval and vertical spacing；
Second step：According to design road number, level interval and the vertical spacing of steel strand wires, suitable H profile steel is processed or selected
Sheet pile；
3rd step：The front-seat steel sheet pile of construction, keeps steel sheet pile to be on same vertical plane；
4th step：Construction heel row steel sheet pile, calculates according to design and requires arrangement H profile steel sheet pile and draw anchor steel sheet pile successively,
Keep interlocking all the time between stake and stake；
5th step：The front-seat dowel crown beam of construction, heel row dowel crown beam and stake top coupling beam；
6th step：500mm below excavation of foundation pit to first of steel strand wires absolute altitude；
7th step：Pushing tow steel strand wires, installation is enclosed steel strand anchoring after purlin, tension steel strand by anchorage in front-seat steel plate
In stake；
8th step：The 6th step, the 7th step are repeated until the construction of last one of steel strand wires is finished；
9th step：It is excavated to foundation ditch bottom；
Tenth step：Foundation Pit bottom is cleared up, flattened, bed course, construction basement bottom board and its structure is poured；
11st step：Back-filling in layers soil, discharges prestress wire by road from bottom to up and reclaims, and front-seat steel is extracted successively
Sheet pile, heel row steel sheet pile.
Further, front and rear campshed piling is finished and front-seat dowel crown beam, heel row dowel crown beam and stake top coupling beam pour completion,
Concrete is reached after design strength requirement, and stage excavation is carried out to foundation ditch；Default first layer level connection joint absolute altitude is arrived when excavating
Place, stops excavating；Then by steel strand wires from drawing the L-type steel pipe of anchoring pile to insert, with pushing tow equipment pushing tow steel strand wires, steel strand wires are from L
After the horizontal segment of shape steel tube stretches out, horizontally advanced in soil layer；, can be adjacent two by correspondence when steel strand wires are close to preceding campshed
The coffees that two sides of triangle piling bar or steel-pipe pile are formed shape of lying prone opens face seizure so that steel strand wires are from two triangle steels
Space between stake or steel-pipe pile is passed, and stops pushing tow；First layer steel strand wires connected horizontally in a construction section from
After being passed in soil layer, purlin and anchorage are enclosed in installation, and apply prestressing force to steel strand wires.
Beneficial effects of the present invention are：
Present invention use multiple-layer horizontal connects double steel sheet piling pit supporting construction, for the soil-baffling structure of foundation ditch, with showing
There is technology to compare to have the following advantages that：Pre-manufactured steel sheet pile can be with factorial praluction, and speed of production is fast, and pile quality is reliable, construction
It is convenient, recycle, environmental protection is cheap.Supporting construction can be while earth-retaining and sealing, pass through stake top coupling beam, level
Connection and inter-pile soil collective effect make front and rear row steel sheet pile formation space redundant structure, and integral rigidity increases, can substantially subtracted
Small Internal forces and deformation, can adjust automatically supporting construction under foundation ditch Water And Earth Pressures complicated and changeable and other load actions
The internal force of itself, is allowed to adapt to complicated and often unpredicted loading condition and deeper base pit engineering.
The present invention set two row's steel sheet piles, wherein after campshed drawing anchoring pile it is special by factory, front two rows steel sheet pile it
Between be connected to become entirety by stake top coupling beam and multiple tracks steel strand wires, form multiple-layer horizontal and connect double steel sheet pile pattern foundation pit supporting structure knot
Structure.The structure is substantially better than traditional Retaining Structure with Double-row Piles in terms of control Excavation Settlement and crater wall lateral displacement, has concurrently simultaneously
Earth-retaining and water stopping function, construction are flexible, and soil layer restoration is good, and duration benefit is obvious, the advantages of economic and environment-friendly.
Brief description of the drawings
Fig. 1 is the vertical structure profile of the present invention；
Fig. 2 is the structure composition figure of A-A sections in Fig. 1；
Fig. 3 is Fig. 2 another structure composition figure；
Fig. 4 is Fig. 2 axonometric drawing；
Fig. 5 is that heel row of the present invention draws anchor pile structure composition detail drawing；
Fig. 6 is that heel row of the present invention draws anchoring pile L-type steel pipe horizontal segment to reinforce figure using reinforcing bar diagonal brace.
Label in Fig. 1~Fig. 6：1st, preceding campshed, 2, rear campshed, 3, front-seat dowel crown beam, 4, heel row dowel crown beam, 5, stake top connects
Beam, 6, steel strand wires, 7, enclose purlin, 8, anchorage, 9, H profile steel stake, 10, draw anchoring pile, 11, L-type steel pipe, 12, cloudy head lock, 13, male
Lock, 14, triangle piling bar, 15, steel-pipe pile, 16, reinforcing bar diagonal brace.
Embodiment
Detailed introduction is done to the present invention below in conjunction with accompanying drawing：
As shown in figure Fig. 1-6, the double steel sheet piling pit supporting construction of multiple-layer horizontal connection of the invention, including preceding campshed 1,
Afterwards campshed 2, front-seat dowel crown beam 3, heel row dowel crown beam 4, stake top coupling beam 5, level connection joint 6, enclose purlin 7 and anchorage 8.
Preceding campshed 1 can use triangle piling bar 14 or steel-pipe pile 15, and rear campshed 2 is by H profile steel stake 9 and draws anchoring pile 10 to constitute.
Anchoring pile 10 is drawn to be welded by H profile steel stake 9 with L-type steel pipe 11.Campshed is provided with lock, cloudy head lock 12 and male lock 13 afterwards
It is separately positioned on rear campshed edge of a wing both sides.
Front and rear campshed piling is finished and front-seat dowel crown beam 3, heel row dowel crown beam 4 and stake top coupling beam 5 pour completion, and concrete reaches
To after design strength requirement, stage excavation is carried out to foundation ditch.Depths (1- is omited when excavating to default first layer level connection joint absolute altitude
2M), stop excavating；Then by steel strand wires 6 from drawing the L-type steel pipe 11 of anchoring pile 10 to insert, with pushing tow equipment pushing tow steel strand wires 6, steel
Twisted wire 6 is horizontally advanced after the horizontal segment of L-type steel pipe 11 stretches out in soil layer；, can be right when steel strand wires are close to preceding campshed 1
The coffees for answering two of adjacent two triangle piling bars 14 or steel-pipe pile 15 sides to be formed shape of lying prone opens face seizure so that steel strand wires 6
Passed from the space between two triangle piling bars 14 or steel-pipe pile 15, stop pushing tow.First layer water in a construction section
After the steel strand wires 6 of flushconnection are passed from soil layer, purlin 7 and anchorage 8 are enclosed in installation, and apply prestressing force to steel strand wires 6.
It is of the invention further to set as follows：
L-type steel pipe horizontal segment end sets reinforcing bar diagonal brace to be reinforced with H profile steel web, it is to avoid L-type steel pipe horizontal segment exists
Bending is caused in injection and withdrawal process.
Enclosing purlin can be using shaped steel such as channel-section steel, H profile steel, I-steel.
It is synchronous to be poured into sand in the hole left after steel sheet pile is extracted, to reduce the deformation of surrounding soil.
Before steel sheet pile injection, wear-reduced coating is heated to complete thawing, is sufficiently stirred for after making its thickness uniform, then brush
On shaped steel surface, its thickness control is in more than 1.0mm, for convenience of extraction.
Calculated according to design, draw anchoring pile to may be selected to insert one every one, insert one every two or insert first-class modes every three and arrange.
Multilayer connects double steel sheet pile supporting construction and is particularly suitable for use in the pattern foundation pit supporting structure of soft clay area, because of soft soil foundation machinery
Piling easily operation.
Multiple-layer horizontal based on the present invention connects the construction method of double steel sheet piling pit supporting construction, including following step
Suddenly：
The first step：Analyzed according to site condition and calculating, it is determined that the model of preceding campshed 1, stake are long, it is determined that after campshed 2 type
Number, are long, the length of cloudy head lock 12 and male lock 13, and double-row pile array pitch, calculate road number, the level of steel strand wires 6
Spacing and vertical spacing；
Second step：According to design road number, level interval and the vertical spacing of steel strand wires 6, suitable H profile steel is processed or selected
Stake 9 and drawing anchoring pile 10；
3rd step：Campshed 1 before construction, campshed is on same vertical plane before keeping.
4th step：Campshed 2 after constructing successively, calculates according to design and requires that arrangement squeezes into H profile steel stake 9 and draws anchoring pile successively
10, keep interlocking all the time between stake and stake.
5th step：The front-seat dowel crown beam 3 of construction, heel row dowel crown beam 4 and stake top coupling beam 5.
6th step：500mm below excavation of foundation pit to first of absolute altitude of steel strand wires 6；
7th step：Pushing tow steel strand wires 6, installation is enclosed steel strand anchoring after purlin 7, tension steel strand 6 by anchorage 8 in front row
On steel sheet pile.
8th step：The 6th step, the 7th step are repeated until the construction of last one of steel strand wires 6 is finished.
9th step：It is excavated to foundation ditch bottom.
Tenth step：Foundation Pit bottom is cleared up, flattened, bed course, construction basement bottom board and its structure is poured；
11st step：Back-filling in layers soil, discharges prestress wire 6 by road from bottom to up and reclaims, and extracts successively front-seat
Stake 1, rear campshed 2.
The mechanism of action of the present invention：
It is along the setting of foundation pit walls parallel direction in the Rock And Soil of ground that multiple-layer horizontal, which connects double steel sheet pile supporting construction,
The parallel stake of two rows, the front two rows stake rectangular distribution of pile body, two campshed stake tops are connected with rigid Guan Liang respectively, in front two rows
Use steel strand wires as level connection joint on pile body at certain position, steel strand wires are applied with a certain size prestressing force, makes front and rear row
Stake, stake top Guan Liang, stake top coupling beam and level connection joint formation space structure.Effect connected horizontally is the anchor using soil layer
Gu the end resistance that power and rear campshed are provided provides support to campshed.The association of double steel sheet pile and foundation soil has been given full play to simultaneously
Same-action, so as to ensure the stability of foundation pit side-wall or slopes, control foundation pit deformation ability, ensure field construction safety and base
Cheat surrounding settlement request.
It is substantially excellent in terms of control foundation ditch lateral deformation and Excavation Settlement that multiple-layer horizontal connects double steel sheet pile supporting construction
In traditional Retaining Structure with Double-row Piles.
Multiple-layer horizontal connects Retaining Structure with Double-row Piles computation model：
The supporting performance of Retaining Structure with Double-row Piles is connected for research multiple-layer horizontal, using FLAC3DNumerical simulation software, sets up
Multilayer connects the computation model of Retaining Structure with Double-row Piles, and the Three Dimensional Dynamic Simulation that digging process is carried out to model is calculated, by right
The analysis of the Stress displacement cloud atlas of supporting construction and the soil body, in the hope of the supporting performance of supporting construction.
The process of simulating excavation is as follows：
1st, the soil body (entity) and the computation model of supporting construction are set up, the constitutive relation of the soil body is selected, the side of the soil body is set
Boundary's condition.
2nd, simulation calculates the deposition consolidation process in weight stress soil under action body, carries out initial field stress balance.
3rd, shell unit and pile element in activation supporting construction, parameter setting is carried out to construction unit.
4th, deadweight displacement zero, is successively arranged to nrll moulds by the material model that Partial Mesh body is excavated in physical model
Type, enters jin and successively excavates.
5th, in successively digging process, when excavating to level connection joint position, supporting construction stream line unit is activated, to this
Unit carries out parameter setting, and applies pretightning force.
Design is calculated：
Stake in supporting construction uses FLAC3DPilework unit simulation, Guan Liang uses shell structure unit simulation, level connection joint
Using FLAC3DIn plain strand cable (cable) simulation.Pilework unit is connected with the node of shell structure unit and uses rigid connection, stake
Construction unit is connected to use with the node of anchor cable structure unit and relatively connect.
1st, physical model is set up
2nd, initial field stress is calculated
The EQUILIBRIUM CALCULATION FOR PROCESS of initial field stress, is the deposition consolidation process in order to simulate the soil body under weight stress effect.It is main
Body gradually can be deposited and tended to balance under the long term of weight stress, reach a relatively stable equilibrium state.
FLAC3DIn this deposition process is simulated by the setting of Time step and computational accuracy.In calculating process, with calculating
Whether the increase of time step, monitoring stops whether body maximal unbalanced force restrains, tended to balance with this determination soil body.
3rd, foundation ditch stage excavation is calculated
After initial field stress calculating terminates, shell unit and stake list in activation multilayer connection Retaining Structure with Double-row Piles model
Member, and parameter setting is carried out to pilework unit, parameter setting is carried out to shell structure unit, continues to calculate.
It is understood that it will be understood by those skilled in the art that being subject to technical scheme and inventive concept
It should all belong to the protection domain of appended claims of the invention with replacing or changing.
Claims (6)
1. a kind of multiple-layer horizontal connects double steel sheet piling pit supporting construction, it is characterised in that：Including front-seat steel sheet pile, heel row steel
Sheet pile, front-seat dowel crown beam, heel row dowel crown beam, stake top coupling beam, steel strand wires, purlin and anchorage are enclosed, preceding campshed uses triangle piling bar
Or steel-pipe pile, rear campshed is by H profile steel stake and draws anchoring pile to constitute；Anchoring pile is drawn to be welded by H profile steel stake with L-type steel pipe, rear campshed
Provided with lock, cloudy head lock and male lock are separately positioned on rear campshed edge of a wing both sides.
2. multiple-layer horizontal according to claim 1 connects double steel sheet piling pit supporting construction, it is characterised in that：Campshed afterwards
Position is respectively arranged between male lock and cloudy head lock, rear campshed and latched by yin, yang head outside the corresponding edge of a wing of web
Mutually interlock to take and be combined.
3. multiple-layer horizontal according to claim 1 connects double steel sheet piling pit supporting construction, it is characterised in that：Heel row is drawn
Anchoring pile is welded by H profile steel stake with some L-type steel pipes, and welding position is selected on H profile steel web, and keeps L-type steel pipe level
Section vertical web face.
4. multiple-layer horizontal according to claim 1 connects double steel sheet piling pit supporting construction, it is characterised in that：L-type steel
Manage that vertical segment length is each unequal, the L-type steel pipe horizontal segment after being welded from H profile steel sheet pile web is in different absolute altitudes.
5. a kind of multiple-layer horizontal based on described in claim 1 connects the construction method of double steel sheet piling pit supporting construction, its
It is characterised by, comprises the following steps：
The first step：Analyzed according to site condition and calculating, it is determined that the model of front-seat steel sheet pile, stake are long, determine heel row steel sheet pile
Model, stake are long, latch length, and double-row pile array pitch, calculate steel strand wires road number, level interval and vertical spacing；
Second step：According to design road number, level interval and the vertical spacing of steel strand wires, suitable H profile steel sheet pile is processed or selected；
3rd step：The front-seat steel sheet pile of construction, keeps steel sheet pile to be on same vertical plane；
4th step：Construction heel row steel sheet pile, calculates according to design and requires arrangement H profile steel sheet pile and draw anchor steel sheet pile, keep successively
Interlocked all the time between stake and stake；
5th step：The front-seat dowel crown beam of construction, heel row dowel crown beam and stake top coupling beam；
6th step：500mm below excavation of foundation pit to first of steel strand wires absolute altitude；
7th step：Pushing tow steel strand wires, installation is enclosed steel strand anchoring after purlin, tension steel strand by anchorage in front-seat steel sheet pile
On；
8th step：The 6th step, the 7th step are repeated until the construction of last one of steel strand wires is finished；
9th step：It is excavated to foundation ditch bottom；
Tenth step：Foundation Pit bottom is cleared up, flattened, bed course, construction basement bottom board and its structure is poured；
11st step：Back-filling in layers soil, discharges prestress wire by road from bottom to up and reclaims, and front-seat steel plate is extracted successively
Stake, heel row steel sheet pile.
6. multiple-layer horizontal according to claim 5 connects the construction method of double steel sheet piling pit supporting construction, its feature
It is, front and rear campshed piling is finished and front-seat dowel crown beam, heel row dowel crown beam and stake top coupling beam pour completion, and concrete reaches design
After intensity requirement, stage excavation is carried out to foundation ditch；When excavating at default first layer level connection joint absolute altitude, stop excavating；Then
By steel strand wires from the L-type steel pipe insertion for drawing anchoring pile, with pushing tow equipment pushing tow steel strand wires, the horizontal segment of steel strand wires from L-type steel pipe is stretched
After going out, horizontally advanced in soil layer；, can be by the adjacent two triangle piling bars of correspondence or steel-pipe pile when steel strand wires are close to preceding campshed
The coffees that are formed of two sides shape of lying prone open face seizure so that steel strand wires are from the space between two triangle piling bars or steel-pipe pile
Pass, stop pushing tow；After first layer steel strand wires connected horizontally in a construction section are passed from soil layer, purlin is enclosed in installation
And anchorage, and prestressing force is applied to steel strand wires.
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| CN107630478A (en) * | 2017-11-02 | 2018-01-26 | 中国建筑第八工程局有限公司 | The simulation test device and method of the native anchor combination supporting system mechanism of action of stake |
| CN109113075A (en) * | 2018-09-29 | 2019-01-01 | 浙江理工大学 | Slope without inner support method for protecting support at the top of soft soil foundation pit |
| CN109403346A (en) * | 2018-11-26 | 2019-03-01 | 中建局集团建设发展有限公司 | A kind of frame-type double-row pile foundation pit enclosure structure and its construction method |
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| CN113123346A (en) * | 2021-04-16 | 2021-07-16 | 中国建筑第八工程局有限公司 | Fabricated anchor pulling node between support pile and wall section steel and construction method thereof |
| CN113513026A (en) * | 2021-04-22 | 2021-10-19 | 中建八局第二建设有限公司 | Soft soil foundation deep foundation pit pile end rear anchoring combined steel sheet pile and construction method thereof |
| CN113550321A (en) * | 2021-06-28 | 2021-10-26 | 上海建工集团股份有限公司 | Prestressed PC construction method combined steel pipe pile foundation pit supporting structure and construction method thereof |
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