CN106930296A - A kind of construction method of internal support of foundation pit - Google Patents

A kind of construction method of internal support of foundation pit Download PDF

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Publication number
CN106930296A
CN106930296A CN201710214243.9A CN201710214243A CN106930296A CN 106930296 A CN106930296 A CN 106930296A CN 201710214243 A CN201710214243 A CN 201710214243A CN 106930296 A CN106930296 A CN 106930296A
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CN
China
Prior art keywords
construction
fish belly
type combination
purlin
belly sill
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CN201710214243.9A
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Chinese (zh)
Inventor
胡金雄
刘永辉
袁伟明
郑建平
张治国
王建勇
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中交第三航务工程局有限公司宁波分公司
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Priority to CN201710214243.9A priority Critical patent/CN106930296A/en
Publication of CN106930296A publication Critical patent/CN106930296A/en

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

Abstract

The present invention relates to a kind of construction method of internal support of foundation pit, lattice column is constructed first, treat after the completion of the lattice column construction earth excavation again;Secondly first anchoring body of construction, and installation, first fish belly sill tool-type combination;Then prestressing force is applied to first fish belly sill tool-type combination;Then construct second anchoring body;Then second fish belly sill tool-type combination is installed and prestressing force is applied to it;Last earth excavation is until the bottom of the foundation ditch, blinding concrete is poured in the bottom of foundation ditch.The construction method of internal support of foundation pit of the present invention, not only easy construction has advantageously reduced cost and duration, and can avoid the deformation of foundation pit side-wall.

Description

A kind of construction method of internal support of foundation pit
Technical field
The present invention relates to the technical field of civil engineering, a kind of construction method of internal support of foundation pit is referred in particular to.
Background technology
With the utilization of continually developing of urbanization and the underground space, the construction of skyscraper, the construction of heavy civil facility, And the exploitation of a large amount of underground spaces promotes base pit engineering fast-developing, correlation engineering technology gradually moves to maturity.Into 20 Base pit engineering is presented development trends such as " big, deep, tight, near " since century.Current base pit engineering gradually present it is fast-growth, The features such as distributed areas are wide, foundation ditch area is big, depth is deep, surrounding enviroment are complicated, increasing large deep foundation pit requirement of engineering Safely, conveniently, quick and economic support technology, the technological means of base pit engineering is improved and innovates.Wherein, prestressing force Fish belly beam type bracing members technology is successfully applied by research and development and experimental study in a series of national engineerings.The skill Art can realize the reliability control to foundation pit deformation, and backing material is realized reclaiming and reused, and reach the green of base pit engineering Color supporting and the target of energy-saving consumption-reducing.
In the existing construction method to internal support of foundation pit, such as Chinese invention patent(CN104141310A)Disclose a kind of dress Construction method with formula prestressing force fish belly sill inner support system, with excavation of foundation pit, sets fish belly sill support according to this from top to bottom, Foundation ditch bottom after-pouring bed course and base plate are excavated, bottom slab concreting to enclosure wall holds out against with enclosure wall, poured after base plate reaches intensity Build top board, top board is poured to enclosure wall, and top board be in bar planting in enclosure wall and with top board in bar connecting.The above method In, foundation depth direction is provided with the support of twice fish belly sill, and the support of twice fish belly sill is each attached on enclosure wall, at top Bar planting and conducted oneself with dignity with undertaking the top section in the range of fish belly sill after support removing with the bar connecting in top board in the enclosure wall, Although the consumable quantity of fish belly sill and type steel support can be reduced effectively, due to needing the setting structure top board on foundation ditch, because This is unfavorable for being constructed in foundation ditch, but also can increase construction volume and construction cost.
The content of the invention
Therefore, the technical problems to be solved by the invention are to overcome constructed in foundation ditch inconvenient in the prior art and apply Work amount is big, the problem of high cost is big so as to provide a kind of constructing operation face, and can effectively reduce construction volume so as to shorten construction speed The construction method of the internal support of foundation pit of degree.
In order to solve the above technical problems, the construction method of the internal support of foundation pit of the invention, wherein along the foundation ditch Inwall is provided with interlocking pile, and the interlocking pile forms closure cofferdam, comprises the following steps:Step S1:Lattice column is constructed, Treat after the completion of the lattice column construction earth excavation again;Step S2:First anchoring body is constructed, and along the interlocking pile Collar tie beam is set, and first fish belly sill tool-type combination is arranged on the collar tie beam;Step S3:To first fish belly sill Tool-type combination applies prestressing force;Step S4:Continue earth excavation, second anchoring body is constructed;Step S5:Install the Two road fish belly sill tool-type combinations, prestressing force is applied to the second fish belly sill tool-type combination;Step S6:Continue spoil The bottom of foundation ditch described in Fang Zhizhi, blinding concrete is poured in the bottom of foundation ditch.
In one embodiment of the invention, after the completion of first anchor construction, installed on the interlocking pile First bracket, first installed on first bracket in first fish belly sill tool-type combination encloses purlin.
In one embodiment of the invention, when collar tie beam being set along the interlocking pile, the construction of the collar tie beam and described the One construction for enclosing purlin intersects to be carried out.
In one embodiment of the invention, described first encloses after purlin installs, then by first fish belly sill tool-type The first angle brace in combination is enclosed between purlin installed in adjacent first, in then installing first fish belly sill tool-type combination First web member, makes the first web member be arranged on described first and encloses on purlin, finally, installs the first steel strand wires, and purlin, the are enclosed by described first What one web member and first steel strand wires were assembled into fish belly shape structure encloses purlin.
In one embodiment of the invention, prestressed method is applied such as to first fish belly sill tool-type combination Under:First the first angle brace in first fish belly sill tool-type combination is pressurizeed, then first fish belly sill work described in tensioning The first steel strand wires in the combination of tool formula, and before the steel strand wires of tensioning first, many steel strand wires are reserved, finally according to foundation ditch lateral pressure Change carries out tensioning again to the steel strand wires reserved.
In one embodiment of the invention, when being constructed to the lattice column, the construction of the lattice column with it is described The construction of interlocking pile is carried out simultaneously.
In one embodiment of the invention, after the completion of the lattice column construction, bracket is welded on the lattice column, so Afterwards support beam is shelved on the bracket.
In one embodiment of the invention, when installing second fish belly sill tool-type combination, by second fish belly sill work In the combination of tool formula second encloses purlin on the second bracket, and second bracket is arranged on the interlocking pile.
In one embodiment of the invention, after enclosing purlin on second bracket by second, then by described second The second angle brace in road fish belly sill tool-type combination is enclosed between purlin installed in adjacent second, then installs the second fish belly sill The second web member in tool-type combination, makes the second web member be arranged on described second and encloses on purlin, finally, installs the second steel strand wires, will Described second enclose that purlin, the second web member and second steel strand wires are assembled into fish belly shape structure enclose purlin.
In one embodiment of the invention, after the completion of the step S6, main pier bearing platform is arranged on and has been poured bed course and is mixed Coagulate on the foundation ditch of soil, after the concrete strength of the main pier bearing platform reaches design strength, start gradually to the second fish Web grider tool-type combination and first fish belly sill tool-type combination are removed.
Above-mentioned technical proposal of the invention has advantages below compared to existing technology:
The construction method of internal support of foundation pit of the present invention, treat lattice column construction after the completion of earth excavation, not only easy construction, And machinery lifts up into the problem for hanging out foundation ditch after avoiding earth excavation, so as to reduce cost and duration;In addition, fish belly sill work Tool formula is combined and forms common space stress system with interlocking pile, and constructing operation face is big, is easy to earth excavation, greatly improves base The stability in hole.
Brief description of the drawings
In order that present disclosure is more likely to be clearly understood, below according to specific embodiment of the invention and combine Accompanying drawing, the present invention is further detailed explanation, wherein
Fig. 1 is the construction method flow chart of internal support of foundation pit of the present invention;
Fig. 2 is the schematic diagram of foundation ditch inner cross-sectional of the present invention;
Fig. 3 is the side view inside foundation ditch of the present invention.
Specific embodiment
As shown in Fig. 1 and Fig. 2 and Fig. 3, the present embodiment provides a kind of construction method of internal support of foundation pit, wherein along described The inwall of foundation ditch is provided with interlocking pile 11, and the interlocking pile 11 forms closure cofferdam, and its step is as follows:Step S1:To lattice column 10 are constructed, treat the lattice column 10 construct after the completion of earth excavation again;Step S2:First anchoring body 31 is applied Work, and collar tie beam 12 is set along the interlocking pile 11, first fish belly sill tool-type combination 20 is arranged on the collar tie beam 12;Step Rapid S3:Prestressing force is applied to first fish belly sill tool-type combination 20;Step S4:Continue earth excavation, to second anchor Solid 32 is constructed;Step S5:Second fish belly sill tool-type combination 40 is installed, to the second fish belly sill tool-type group Close 40 and apply prestressing force;Step S6:Continue earth excavation until the bottom of the foundation ditch, pours bed course and mix in the bottom of foundation ditch Solidifying soil.
Above-mentioned is core technology scheme of the invention, the construction method of internal support of foundation pit of the present invention, along the foundation ditch Inwall be provided with interlocking pile 11, can effectively prevent water and soil from entering foundation ditch, and the interlocking pile 11 by the interlocking pile 11 Closure cofferdam is formed, makes the supporting construction rigidity of composition big, so as to be conducive to controlling the deformation of foundation pit side-wall, it is to avoid foundation ditch is erected The upward deformation of Nogata;In the step S1, the lattice column 10 is constructed, be conducive to the inner support knot to the foundation ditch Structure is supported, treat the lattice column 10 construct after the completion of earth excavation, not only easy construction, and after avoiding earth excavation Machinery lifts up into the problem for hanging out foundation ditch, so as to reduce cost and duration, in the step S2, first anchoring body 31 is carried out Construction, makes first anchoring body 31 be connected with the interlocking pile 11, so as to be conducive to offsetting the soil pressure on foundation ditch;Along institute State interlocking pile 11 and collar tie beam 12 is set, the uniform force of the interlocking pile 11 can be made by the collar tie beam 12, so as to advantageously ensure that The rigidity and stability of supporting construction;First fish belly sill tool-type combination 20 is arranged on the collar tie beam 12, makes described the One fish belly sill tool-type combination 20 is fixed on the interlocking pile 11, so as to form common space-load system, is not only had Beneficial to the deformation in control foundation ditch horizontal direction, and constructing operation face is big, is easy to earth excavation;In the step S3, to institute State first fish belly sill tool-type combination 20 and apply prestressing force, by applying prestressing force, not only contribute to control described first The deformation of fish belly sill tool-type combination 20, and the failure mode of the enclosed structure of fish belly sill tool-type combination is ductile fracture, Therefore, be able to ensure that in excavation of foundation pit the sufficient time for the excessive soil pressure or abnormal soil pressure that may occur take effectively and Timely measure, in addition, preload also is applied to the whole excavation face in foundation ditch periphery after applying prestressing force, therefore also can be effectively pre- The sedimentation of anti-periphery ground;In the step S4, continue earth excavation, second anchoring body 32 is constructed, so that favorably Soil pressure on counteracting foundation ditch;In the step S5, second fish belly sill tool-type combination 40 is installed, specifically, by second Road fish belly sill tool-type combination 40 is also secured on the interlocking pile 11, so that common space-load system is formed, and to institute State second fish belly sill tool-type combination 40 and apply prestressing force, so as to be conducive to controlling the second fish belly sill tool-type combination 40 deformation and the sedimentation of periphery ground;In the step S6, continue earth excavation up to the bottom of the foundation ditch, described Bottom of foundation ditch pours blinding concrete, so that while bottom of foundation ditch is smooth, reaching the effect of sealing.
In the step S1, lattice column 10 is constructed, make the lattice column 10 can be as first fish belly The vertical supporting of beam tool-type combination 20 and second fish belly sill tool-type combination 40, and the lattice column 10 construction and institute The construction of interlocking pile 11 is stated while carrying out, so as to be conducive to being constructed using the construction machinery of the interlocking pile, it is to avoid the earthwork Machinery lifts up into the problem for hanging out foundation ditch after excavation, so as to advantageously reduce cost and duration.Wherein the lattice column 10 is constructed When, hole is drawn in Foundation Pit bottom top using rotary pile-digging machine, and the following concrete parts in Foundation Pit bottom draw hole using down-hole hammer To the stake bottom absolute altitude of the lattice column 10, then the lattice column 10 is delivered to a bottom, then casting concrete, and make the coagulation The absolute altitude of soil compares designed elevation;A spirit level is configured during pile follower, mark is pulled in advance on pile follower bar to control stake top absolute altitude.
In conjunction with shown in Fig. 3, in the step S2, during excavation pit, the soil pressure of bank side More than the unfavorable factor of water pressure, in addition it is also necessary to which the inner support to the foundation ditch carries out decompression design.Specifically, the lattice column 10 Construction after the completion of, ground floor excavation is carried out to the earthwork, treat ground floor earth excavation until the construction work of first anchoring body 31 When making face, first anchoring body 31 is constructed, first anchoring body 31 is connected with the interlocking pile 11, so as to have Beneficial to the deformation in the horizontal direction of control foundation ditch;And during construction first anchoring body 31, treat that the collar tie beam 12 has been constructed Cheng Shizai constructions first anchoring body 31.
In the present invention, the anchoring body can be stiffening pile can also anchor cable, the stiffening pile is discussed in detail again below Construction method:Certain angle is pressed using jet drill rig(It it is 15 ° -45 ° or so with horizontal direction angle)The pore-forming in the soil body, Water under high pressure mud is sprayed to the soil body by rotary jetting apparatus simultaneously, cement mortar is thoroughly mixed with the soil body, forms soil cement anchoring body, While pore-forming is stirred, by reinforcing body(Generally steel wire bundle)Bring into pile body, when pile pile body reaches design length, Auger stem is exited, so as to be formed plus dowel soil cement solidifying body, by the hollow channel of above-mentioned drilling rod, is stirred in drilling Slip casting, drilling brings steel strand wires and anchor head structural member into projected depth simultaneously.In a word, construction jet mixing soil cement stiffening pile, Its construction technology is the method for using disposable pile, i.e.,:Drilling, stirring, joint bar are once completed.During Specific construction, in the earthwork After excavation, absolute altitude should be measured, and bracing wire is marked on the interlocking pile 11, it is to be positioned after the completion of utilize special drilling machine pore-forming, Then dowel is manufactured, first the pre- tensioning of load is locked once with 20% before tensioning fixation, and formal tensioning are finally carried out to dowel, then With 50%, 100% locking load grading tension, then ultra stretching keeps rather to 110% locking load under ultra stretching load Clock, again by locking load locking after observation anchor head non-displacement phenomenon;If not reaching requirement, should aside piling.The present invention is used The stiffening pile can not only improve anchor force, be not likely to produce the phenomenons such as leak and quicksand, and can be by soil, the sand after water-stop curtain Got lodged in hole with water seal, the depression of superstratum will not be caused.
First installed while setting collar tie beam 12 along the interlocking pile 11 in first fish belly sill tool-type combination 20 encloses Purlin 13, and install described first along the collar tie beam 12 and enclose purlin 21.It is comprised the following steps that:The reinforcing bar of collar tie beam 12 described in first colligation Cage, so as to be conducive to improving the rigidity of the collar tie beam 12, then installs described first and encloses purlin 21, using described first enclose purlin 21 as The inner side template of the collar tie beam 12, described first is connected by the way of embedded bolt and encloses purlin 21 and collar tie beam 12;Finally, to described Collar tie beam 12 carries out casting concrete, the collar tie beam 12 is constituted an entirety, therefore the construction of the collar tie beam 12 and described the One construction for enclosing purlin 13 intersects to be carried out.
In addition, install described first enclose purlin 21 before, slotted on the interlocking pile 11 and first bracket 13 be set, by described the One encloses purlin 21 on the support of first bracket 13, and when setting first bracket 13, controls first bracket 13 enclose the center line of purlin 21 on same horizontal plane with described first.Specifically, the upper surface of first bracket 13 and institute State first and enclose the lower surface of purlin 21 on same horizontal plane, so as to first fish belly sill tool-type combination is fixed on into institute State on interlocking pile 11.After enclosing purlin 21 on first bracket 13 by first, due to the stress that the corner of foundation ditch is subject to Greatly, it is therefore desirable to the first angle brace 22 in first fish belly sill tool-type combination 20 is enclosed into purlin 21 installed in adjacent first again Between, and make first angle brace 22 enclose purlin 21 with described first to be fastenedly connected, not only play a supporting role foundation ditch, Er Qieke To improve the integral rigidity of pre-loaded support struts system;The first abdomen in first fish belly sill tool-type combination 20 is then installed Bar 23, makes the first web member 23 be arranged on described first and encloses on purlin 21, and specifically, described first encloses purlin 21 and first web member 23 By welding and bolt be attached, finally, install the first steel strand wires 24, by described first enclose purlin 21, the first web member 23 and What first steel strand wires 24 were assembled into fish belly shape structure encloses purlin.
In the step S3, prestressed method is applied to first fish belly sill tool-type combination 20 as follows:It is first right First angle brace 22 pressurizes, so that the effectively deformation of prevention foundation ditch corner, then the first steel strand wires of tensioning 24, and tensioning first steel During twisted wire 24, tensioning position and connecting portion are checked(At foundation bolt and bolt connection)Row construction again after qualified, such that it is able to Reach control and reduce the deformation of fish belly sill, prestressing force is applied so as to favourable by first fish belly sill tool-type combination In preload is applied to the whole excavation face in foundation ditch periphery, prevent the sedimentation of periphery ground.
In the step S4, up to the operation side of second anchoring body 32 after continuation earth excavation, to the second Anchoring body 32 is constructed, and the second anchoring body 32 is connected with the interlocking pile 11, by the second anchoring body 32 further counteract the soil pressure on foundation ditch, after the completion for the treatment of that the second anchoring body 32 is constructed, install second fish belly sill Tool-type combination 40, so as to be conducive to controlling foundation ditch deformation in the horizontal direction.The wherein second anchoring body 32 is applied Work method is identical with the construction method of first anchoring body 31, is not repeated.
In the step S5, when installing second fish belly sill tool-type combination 40, by second fish belly sill tool-type combination In 40 second encloses purlin on the second bracket 14, and second bracket 14 is arranged on the interlocking pile 11;In addition, When second bracket 14 is set, second bracket 14 and second is controlled to enclose the center line of purlin on same horizontal plane.Tool Body ground, one end that described second encloses purlin and force transmission element 30 is welded, then by the other end of the force transmission element 30 and the interlocking pile 11 welding, so as to the second fish belly sill tool-type combination 40 is fixed on the interlocking pile 11.Purlin is enclosed by second to install After on second bracket 14, because the stress that the corner of foundation ditch is subject to is big, it is therefore desirable to again by the second fish belly The second angle brace in beam tool-type combination 40 is enclosed between purlin installed in adjacent second, and second angle brace is enclosed with described second Purlin is fastenedly connected, and not only foundation ditch is played a supporting role, and can improve the integral rigidity of pre-loaded support struts system;Then pacify The second web member in the second fish belly sill tool-type combination 40 is filled, the second web member is arranged on described second and is enclosed on purlin, had Body ground, described second encloses purlin and second web member is attached by welding and bolt, finally, installs the second steel strand wires, will Described second enclose that purlin, the second web member and second steel strand wires are assembled into fish belly shape structure enclose purlin.
Similarly, the second fish belly sill tool-type combination 40 is applied prestressed method with to first fish belly It is identical that beam tool-type combination 20 applies prestressed method, specifically:First second angle brace is pressurizeed, so as to effectively prevent base The deformation of corner is cheated, during the second steel strand wires of the then steel strand wires of tensioning second, and tensioning, tensioning position and connecting portion is checked (At foundation bolt and bolt connection)Row construction again after qualified, such that it is able to reaching control and reducing the deformation of fish belly sill, passes through Apply prestressing force to the second fish belly sill tool-type combination 40 so as to be conducive to applying pre- to the whole excavation face in foundation ditch periphery Loading is carried, and prevents the sedimentation of periphery ground.
In the present embodiment, after the completion of the lattice column 10 is constructed, bracket is welded on the lattice column 10, then described Support beam is shelved on bracket, encloses what purlin, web member and the steel strand wires were assembled into by described by the way that support beam support is above-mentioned Fish belly shape structure encloses purlin.
It should be noted that:Due to angle brace and enclose between purlin and have angle, be difficult to be mounted directly angle brace and it is applied it is pre- should Power;But straight degree that is pre-splicing and checking pre-splicing rear support first should be carried out on ground before the installation of per pass angle brace, close on inspection It is in place by position integral hoisting to be carried out after lattice.And should be carried out by root in order for the tensioning of steel strand wires, it is considered to because between steel beam The influence of frictional resistance, to design stress, i.e. to 50%, second tensioning to 70%, third time is opened for first time tensioning for tensioning in three times 100% is moved to, to ensure that whole fish belly joist steel Shu Zhangla meets design code stress value after finishing.Furthermore, in order to ensure foundation ditch side The change of pressure in the reasonable scope, can reserve many steel strand wires before tensioning, finally according to foundation ditch lateral pressure change to it Carry out tensioning again.In addition, enclosing, axial reference point must be determined before purlin is installed, calculated by coordinate with total powerstation or theodolite Survey sets the basic point on the inside of the two neighboring corner of the foundation ditch, and Plane Installation positioning is carried out using the method for hanging wire by the basic point, And the unilateral position line of gusset purlin need to be met in straight line in the foundation ditch, the purpose is to ensure that outside is gone along with sb. to guard him after applying prestressing force Structure stress is uniform.
After the completion of the step S6, main pier bearing platform is arranged on and has been poured on the foundation ditch of blinding concrete, treat the main pier After the concrete strength of cushion cap reaches design strength, start gradually to the second fish belly sill tool-type combination 40 and described First fish belly sill tool-type combination 20 is removed.Wherein, first fish belly sill tool-type combination 20 is removed When, the first steel strand wires 24 are removed first, the first web member 23 is then removed, the first angle brace 22 is then removed, finally remove first and enclose Purlin 21.Similarly, when being removed to the second fish belly sill tool-type combination 40, the second steel strand wires are removed first, then tear open Except the second web member, the second angle brace is then removed, finally remove second and enclose purlin.
It is above-mentioned when being removed to steel strand wires, it is necessary first to discharge stress, discharged range request operation as symmetrical as possible, from And be conducive to structure stress balanced.Specifically, socket wrench specially adapted for it is put into anchorage first;Twisted using steel strand wires release tensioning steel Line, the intermediate plate in it can take away the anchorage;Using the intermediate plate in tip pliers separation of steel twisted wire and anchorage;Release is described Steel strand wires tension force;After the intermediate plate of one end is all reclaimed, using the intermediate plate of the same method recycling other end, steel is finally reclaimed Twisted wire.Special jack support top is used when being removed to the angle brace and suitably reinforcing holds out against, then take out adjustment billet, it is very heavy Power is progressively unloaded on top, continues to unload power after parked a period of time, until terminating.To it is described enclose purlin and remove when, first by crane steel Cord is divided to and lies in enclose purlin two shackles;Secondly removal encloses the foundation bolt that purlin is connected with collar tie beam;Then purlin is enclosed in lifting, is hung auxiliary Suspension hook is moved down to make to enclose purlin and risen vertically, is then hung to ground and is removed angle bracket, last handling entrucking.
In addition, fish belly sill tool-type combination demolishing process is to meet the outer soil body in hole using constructing structure support replacement load transfering strip to receive Power requirement process, to pay special attention to during dismounting ensure fish belly it is girder pre-stressed, it is angle brace axle power safety unloading, it is to avoid stress mutation To going along with sb. to guard him, agent structure has a negative impact and avoids falling and causing safety and quality accident during bracing members handling. Therefore fish belly sill tool-type combination remove must after its bridge pier foundation in construction duration is finished and reaches design strength form removal, in institute State between main pier bearing platform and the supporting construction Cast-in-situ Piles in Sand-filling and compaction in layers rear diagonal brace is removed, strengthen in demolishing process Foundation ditch body and every monitoring of surrounding enviroment deformation, region and length are removed according to monitoring situation adjustment.Angle brace removes region Interior prestressing force uses load shedding mode, and need to observe the foundation pit deformation situation of several hours after unloading safely, after waiting stabilization Assembled steel support is removed again, to ensure the safety and stability of foundation ditch.
In the present invention, first fish belly sill tool-type combination 20 and the second fish belly sill tool-type combination 40 are pacified After the completion of dress, also need to set axle power monitoring point, fish belly sill tool-type combination is monitored respectively.
To sum up, technical scheme of the present invention has advantages below:
1. the construction method of internal support of foundation pit of the present invention, interlocking pile is provided with along the inwall of the foundation ditch, by the occlusion Stake can effectively prevent water and soil from entering foundation ditch, and the interlocking pile forms closure cofferdam, make the supporting construction rigidity of composition big, So as to be conducive to controlling the deformation of foundation pit side-wall;In the step S1, the lattice column is constructed, be conducive to the base The inner supporting structure in hole is supported, and treats earth excavation after the completion of the lattice column construction, not only easy construction, and avoid Machinery lifts up into the problem for hanging out foundation ditch after earth excavation, so as to reduce cost and duration;In the step S2, to first anchor Solid is constructed, make first anchoring body respectively with the foundation ditch around cemented rock and the interlocking pile connect Connect, so as to be conducive to offsetting the soil pressure on foundation ditch, collar tie beam is set along the interlocking pile, described stinging can be made by the collar tie beam Stake uniform force is closed, so as to advantageously ensure that the rigidity and stability of supporting construction;First fish belly sill tool-type combination is pacified On the collar tie beam, first fish belly sill tool-type combination is set to be fixed on the interlocking pile, so as to form common Space-load system, is not only advantageous to control deformation, and be easy to earth excavation;In the step S3, to first fish Web grider tool-type combination applies prestressing force, by applying prestressing force, not only contributes to control first fish belly sill tool-type The deformation of combination, and can effectively prevent the sedimentation of periphery ground;In the step S4, continue earth excavation, to second Anchoring body is constructed, so as to be conducive to further offsetting the soil pressure on foundation ditch;In the step S5, by second fish belly sill Tool-type combination is also secured on the interlocking pile, so that common space-load system is formed, and to the second fish belly Beam tool-type combination applies prestressing force, so as to be conducive to controlling deformation and the periphery of the second fish belly sill tool-type combination The sedimentation of ground;In the step S6, continue earth excavation until the bottom of the foundation ditch, bed course is poured in the bottom of foundation ditch Concrete, so that while bottom of foundation ditch is smooth, reaching the effect of sealing.
2. the construction method of internal support of foundation pit of the present invention, prestressed method is applied such as to fish belly sill tool-type combination Under:The pressurization of first diagonal brace, so that the effectively deformation of prevention foundation ditch corner, then tension steel strand, and during tension steel strand, inspection Look into tensioning position and connecting portion it is qualified after again row construction, such that it is able to reach control and reduce fish belly sill deformation, by right The fish belly sill tool-type combination applies prestressing force so as to be conducive to applying preload, prevention to the whole excavation face in foundation ditch periphery The sedimentation of periphery ground.
Obviously, above-described embodiment is only intended to clearly illustrate example, not to the restriction of implementation method.For For those of ordinary skill in the art, the change of other multi-forms can also be made on the basis of the above description or is become It is dynamic.There is no need and unable to be exhaustive to all of implementation method.And the obvious change or change thus extended out Among moving still in the protection domain of the invention.

Claims (10)

1. a kind of construction method of internal support of foundation pit, wherein being provided with interlocking pile, and the interlocking pile shape along the inwall of the foundation ditch Into closure cofferdam, it is characterised in that comprise the following steps:
Step S1:Lattice column is constructed, earth excavation again is treated after the completion of lattice column construction;
Step S2:First anchoring body is constructed, and collar tie beam is set along the interlocking pile, and by first fish belly sill instrument Formula combination is arranged on the collar tie beam;
Step S3:Prestressing force is applied to first fish belly sill tool-type combination;
Step S4:Continue earth excavation, second anchoring body is constructed;
Step S5:Second fish belly sill tool-type combination is installed, prestressing force is applied to the second fish belly sill tool-type combination;
Step S6:Continue earth excavation until the bottom of the foundation ditch, blinding concrete is poured in the bottom of foundation ditch.
2. the construction method of internal support of foundation pit according to claim 1, it is characterised in that:First anchor construction is complete Cheng Hou, installs the first bracket on the interlocking pile, and first fish belly sill tool-type combination is installed on first bracket In first enclose purlin.
3. the construction method of internal support of foundation pit according to claim 2, it is characterised in that:Along the interlocking pile, collar tie beam is set When, the construction of the collar tie beam intersects with first construction for enclosing purlin to be carried out.
4. the construction method of internal support of foundation pit according to claim 3, it is characterised in that:After described first encloses purlin installation, then The first angle brace in first fish belly sill tool-type combination is enclosed between purlin installed in adjacent first, described is then installed The first web member in one fish belly sill tool-type combination, makes the first web member be arranged on described first and encloses on purlin, finally, installs first Steel strand wires, by described first enclose that purlin, the first web member and first steel strand wires are assembled into fish belly shape structure enclose purlin.
5. according to claim 1 or 4 internal support of foundation pit construction method, it is characterised in that:To first fish belly sill It is as follows that tool-type combination applies prestressed method:First the first angle brace in first fish belly sill tool-type combination is added Press, then the first steel strand wires in first fish belly sill tool-type combination described in tensioning, and before the steel strand wires of tensioning first, reserve many Root steel strand wires, the change finally according to foundation ditch lateral pressure carries out tensioning again to the steel strand wires reserved.
6. the construction method of internal support of foundation pit according to claim 1, it is characterised in that:The lattice column is constructed When, the construction of the lattice column is carried out simultaneously with the construction of the interlocking pile.
7. the construction method of internal support of foundation pit according to claim 6, it is characterised in that:After the completion of the lattice column construction, Bracket is welded on the lattice column, then support beam is shelved on the bracket.
8. the construction method of internal support of foundation pit according to claim 1, it is characterised in that:Second fish belly sill tool-type is installed During combination, second in second fish belly sill tool-type combination is enclosed into purlin on the second bracket, and second bracket sets It is placed on the interlocking pile.
9. the construction method of internal support of foundation pit according to claim 8, it is characterised in that:Purlin is enclosed by second be arranged on described the After on two brackets, then the second angle brace in the second fish belly sill tool-type combination is enclosed between purlin installed in adjacent second, The second web member in the second fish belly sill tool-type combination is then installed, the second web member is arranged on described second and is enclosed purlin On, finally, the second steel strand wires are installed, enclose purlin, the second web member and second steel strand wires by described second and be assembled into a fish Abdomen shape structure encloses purlin.
10. the construction method of internal support of foundation pit according to claim 1, it is characterised in that:After the completion of the step S6, by master Pier cushion cap is arranged on and has poured on the foundation ditch of blinding concrete, treats that the concrete strength of the main pier bearing platform reaches design strength Afterwards, start gradually to tear the second fish belly sill tool-type combination and first fish belly sill tool-type combination open Remove.
CN201710214243.9A 2017-04-01 2017-04-01 A kind of construction method of internal support of foundation pit CN106930296A (en)

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Application publication date: 20170707