CN106958249A - The installation of prestressing force fish belly sill tool-type combination inner support and method for dismounting - Google Patents

The installation of prestressing force fish belly sill tool-type combination inner support and method for dismounting Download PDF

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Publication number
CN106958249A
CN106958249A CN201710213812.8A CN201710213812A CN106958249A CN 106958249 A CN106958249 A CN 106958249A CN 201710213812 A CN201710213812 A CN 201710213812A CN 106958249 A CN106958249 A CN 106958249A
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CN
China
Prior art keywords
type combination
fish belly
belly sill
tool
sill tool
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CN201710213812.8A
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Chinese (zh)
Inventor
叶中海
梁胜发
袁伟明
刘永辉
李楠
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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 CN201710213812.8A priority Critical patent/CN106958249A/en
Publication of CN106958249A publication Critical patent/CN106958249A/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 installation of prestressing force fish belly sill tool-type combination inner support and method for dismounting, first earth excavation, collar tie beam is set along interlocking pile, and first of fish belly sill tool-type combination is arranged on the collar tie beam;Then prestressing force is applied to first of fish belly sill tool-type combination;Earth excavation is then continued to, second fish belly sill tool-type combination is installed and applies prestressing force to it, finally continues earth excavation until the bottom of the foundation ditch, blinding concrete is poured in the bottom of foundation ditch.The input amount of not only steel of the invention is small, and constructing operation face is big, is easy to earth excavation, and is conducive to control to deform, and can prevent the sedimentation of periphery ground.

Description

The installation of prestressing force fish belly sill tool-type combination inner support and method for dismounting
Technical field
The present invention relates to the technical field of civil engineering, a kind of prestressing force fish belly sill tool-type combination inner support is referred in particular to Installation and method for dismounting.
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 Development trends such as " big, deep, tight, near " is presented in base pit engineering 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 innovated.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 and reclaimed with reusing, the green of base pit engineering has been reached Color supporting and the target of energy-saving consumption-reducing.
In the existing installation method to prestressing force fish belly sill tool-type combination inner support, such as Chinese invention patent (CN102839675A)A kind of pattern foundation pit supporting structure large-span prestressed fish belly sill and its installation method are disclosed, by the string of fish belly sill Beam is arranged on special bracket and levelling;The web member enclosed on purlin and string beam are carried out assembled;Fulcrum is connected at the two ends for enclosing purlin Connection member carries out assembled with string beam;Steel strand wires are installed, are fixed on the fulcrum connecting elements at two ends, while steel strand wires are pacified Mounted in the top of web member;By string beam and pit maintenance soil wall connecting;Support reaction is applied to the two ends fulcrum connecting elements of string beam;It is right Steel strand wires apply prestressing force.In the above method, the lower-cord beam and foundation pit enclosure wall connecting, although can effectively control foundation ditch Deformation in the horizontal direction, but still there is the problem of deforming in foundation ditch in the vertical direction.
The content of the invention
Therefore, the technical problems to be solved by the invention are to overcome foundation ditch in the vertical direction presence in the prior art to become The problem of shape so as to provide it is a kind of can control the deformation of foundation ditch horizontal direction and can control to deform on foundation ditch vertical direction it is pre- The installation of stress fish belly sill tool-type combination inner support and method for dismounting.
In order to solve the above technical problems, the installation side of the prestressing force fish belly sill tool-type combination inner support of the present invention Method, wherein being provided with interlocking pile, and interlocking pile formation closure cofferdam along the inwall of foundation ditch, comprises the following steps:Step S1:Open Earth excavation, sets collar tie beam, and first of fish belly sill tool-type combination is arranged on the collar tie beam along the interlocking pile;Step S2:Prestressing force is applied to first of fish belly sill tool-type combination;Step S3:Continue earth excavation, second fish belly is installed Beam tool-type combination, and prestressing force is applied to the second fish belly sill tool-type combination;Step S4:Continue earth excavation until The bottom of the foundation ditch, blinding concrete is poured in the bottom of foundation ditch.
In one embodiment of the invention, while collar tie beam being set along the interlocking pile, first of fish belly sill work is installed First in the combination of tool formula encloses purlin, and encloses purlin along collar tie beam installation described first.
In one embodiment of the invention, install described first to enclose before purlin, fluting sets first on the interlocking pile Bracket, purlin is enclosed on the support of first bracket by described first.
In one embodiment of the invention, described first enclose purlin on first bracket after, then by described the The first angle brace in one of fish belly sill tool-type combination is enclosed between purlin installed in adjacent first, then installs first of fish belly The first web member in beam tool-type combination, makes the first web member be arranged on described first and encloses on purlin, finally, installs the 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.
In one embodiment of the invention, prestressed method is applied such as to first of fish belly sill tool-type combination Under:First the first angle brace in first of fish belly sill tool-type combination is pressurizeed, then first of 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 and tensioning again is carried out to reserved steel strand wires.
In one embodiment of the invention, collar tie beam is set along the interlocking pile, while installing first of fish belly sill instrument First in formula combination encloses comprising the following steps that for purlin:The steel reinforcement cage of collar tie beam described in first colligation, then installs described first and encloses purlin, Purlin is enclosed as the inner side template of the collar tie beam using described first, finally, casting concrete is carried out to the collar tie beam.
In one embodiment of the invention, it is additionally provided with step S0 before the step S1:Lattice column is constructed, and The construction of the lattice column and the construction of the interlocking pile are carried out simultaneously.
In one embodiment of the invention, after the completion of lattice column construction, the earthwork is carried out first layer excavate until First of anchor construction scope of operation, then constructs to first of anchoring body.
Present invention also offers a kind of method for dismounting of prestressing force fish belly sill tool-type combination inner support, above-mentioned foundation ditch bottom is treated Portion is poured after blinding concrete, and main pier bearing platform is arranged on and poured on the foundation ditch of blinding concrete, it is characterised in that:Treat described The concrete strength of main pier bearing platform is reached after design strength, and the second fish belly sill tool-type combination is removed first, Then first of fish belly sill tool-type combination is removed again.
In one embodiment of the invention, when being removed to first of fish belly sill tool-type combination, tear open first Except the first steel strand wires in first of fish belly sill tool-type combination, first of fish belly sill tool-type combination is then removed In the first web member, then remove the first angle brace in first of fish belly sill tool-type combination, finally remove described first First in road fish belly sill tool-type combination encloses purlin;When being removed to the second fish belly sill tool-type combination, tear open first Except the second steel strand wires in the second fish belly sill tool-type combination, the second fish belly sill tool-type combination is then removed In the second web member, then remove the second angle brace in the second fish belly sill tool-type combination, finally remove described second Second in road fish belly sill tool-type combination encloses purlin.
The above-mentioned technical proposal of the present invention has advantages below compared with prior art:
The installation of prestressing force fish belly sill tool-type combination inner support of the present invention and the input amount of method for dismounting, not only steel It is smaller, and fish belly sill tool-type combination forms common space stress system with the interlocking pile, constructing operation face is big, not only favorably In control deformation, and it is easy to earth excavation, substantially increases the stability of foundation ditch;In addition to the fish belly sill tool-type combination Apply prestressing force, can effectively prevent the sedimentation of periphery ground.
Brief description of the drawings
In order that present disclosure is more likely to be clearly understood, specific embodiment and combination below according to the present invention Accompanying drawing, the present invention is further detailed explanation, wherein
Fig. 1 is installation and the method for dismounting flow chart of prestressing force fish belly sill tool-type combination inner support of the present invention;
Fig. 2 is the schematic diagram of foundation ditch inner cross-sectional of the present invention;
Side view inside Fig. 3 foundation ditches of the present invention.
Embodiment
Embodiment one:
As shown in Fig. 1 and Fig. 2 and Fig. 3, the present embodiment provides a kind of installation of prestressing force fish belly sill tool-type combination inner support Method, wherein being provided with interlocking pile 11, and the formation closure of the interlocking pile 11 cofferdam along the inwall of foundation ditch, its step is as follows:Step S1:Earth excavation, sets collar tie beam 12, and first of fish belly sill tool-type combination 20 is arranged on into the circle along the interlocking pile 11 On beam 12;Step S2:Prestressing force is applied to first of fish belly sill tool-type combination 20;Step S3:Continue earth excavation, peace Second fish belly sill tool-type combination 40 is filled, and prestressing force is applied to the second fish belly sill tool-type combination 40;Step S4: Continue earth excavation until the bottom of the foundation ditch, blinding concrete is poured in the bottom of foundation ditch.
Above-mentioned is the core technology scheme of the present invention, the construction method of internal support of foundation pit of the present invention, along along foundation ditch Wall is provided with interlocking pile 11, can effectively prevent that water and soil from entering foundation ditch by the interlocking pile 11, and the interlocking pile 11 is formed Cofferdam is closed, 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 side vertically Upward deformation;In the step S1, earth excavation sets collar tie beam 12 along the interlocking pile 11, can be with by the collar tie beam 12 Make the uniform force of interlocking pile 11, so that the rigidity and stability of supporting construction are advantageously ensured that, by first of fish belly sill work Tool formula combination 20 is arranged on the collar tie beam 12, the combination of first of fish belly sill tool-type 20 is fixed on the interlocking pile 11 On, so as to form common space-load system, it is not only advantageous to control the deformation in foundation ditch horizontal direction, and constructing operation Face is big, is easy to earth excavation;In the step S2, prestressing force is applied to first of fish belly sill tool-type combination 20, passed through Apply prestressing force, not only contribute to control the deformation of first of fish belly sill tool-type combination 20, and fish belly sill tool-type The failure mode of the enclosed structure of combination is ductile fracture, therefore, is able to ensure that the sufficient time for can in excavation of foundation pit The excessive soil pressure or abnormal soil pressure that can occur are taken effectively and timely measure, in addition, applying after prestressing force also to foundation ditch periphery Whole excavation face applies preload, therefore also can effectively prevent the sedimentation of periphery ground;In the step S3, continue spoil Side, installs second fish belly sill tool-type combination 40, specifically, second fish belly sill tool-type combination 40 is also secured at described On interlocking pile 11, so as to form common space-load system, and pre- is applied to the second fish belly sill tool-type combination 40 Stress, so as to be conducive to controlling the deformation of the second fish belly sill tool-type combination 40 and the sedimentation of periphery ground;It is described In step S4, continue earth excavation until the bottom of the foundation ditch, pours blinding concrete, so that base in the bottom of foundation ditch While hole bottom is smooth, the effect of sealing is reached.
In the present invention, before the step S1, step S0 is additionally provided with:When being constructed to lattice column 10, make the lattice Structure post 10 can be used as the vertical of first of fish belly sill tool-type combination 20 and second fish belly sill tool-type combination 40 Support, the construction and the construction of the interlocking pile 11 of the lattice column 10 are carried out simultaneously, by using applying for the interlocking pile 11 Work machinery is constructed, it is to avoid machinery lifts up into the problem of hanging out foundation ditch after earth excavation, so as to advantageously reduce cost and duration. When wherein being constructed to the lattice column 10, Foundation Pit bottom top drawn using rotary pile-digging machine and mixed below hole, the Foundation Pit bottom Solidifying soil part draws hole using down-hole hammer and delivers to a bottom to the stake bottom absolute altitude of the lattice column 10, then the lattice column 10, then Casting concrete, and the absolute altitude of the concrete is compared designed elevation;A spirit level is configured during pile follower, on pile follower bar in advance Mark is pulled to control stake top absolute altitude.
In conjunction with shown in Fig. 3, during excavation pit, the soil pressure of bank side is more than water pressure not Sharp factor causes the deformation of foundation ditch, 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, first layer excavation is carried out to the earthwork, first layer earth excavation is treated until the construction work of first anchoring body 31 When making face, first of anchoring body 31 is constructed, first of anchoring body 31 is connected with the interlocking pile 11, so as to have Beneficial to the deformation of control foundation ditch in the horizontal direction;And during construction first of anchoring body 31, treat that the collar tie beam 12 has been constructed Cheng Shizai constructions first of 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, 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 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, finally dowel is carried out first to lock the pre- tensioning of load once with 20% before tensioning fixation, and formal tensioning, then With 50%, 100% locking load grading tension, then ultra stretching is to 110% locking load, holding a few minutes under ultra stretching load Again by locking load locking after clock, observation anchor head non-displacement phenomenon;, should aside piling if not reaching requirement.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 the soil after water-stop curtain, sand Got lodged in water seal in hole, the depression of superstratum will not be caused.
While setting collar tie beam 12 along the interlocking pile 11, first installed in first of 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, which intersects, to be carried out.
Described first enclosed in addition, installing before purlin 21, fluting sets the first bracket 13 on the interlocking pile 11, by described the One encloses purlin 21 on the support of first bracket 13, and when setting first bracket 13, controls first bracket 13 and described first enclose the center line of purlin 21 on same horizontal plane.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 that first of fish belly sill tool-type combination is fixed on into institute State on interlocking pile 11.After purlin 21 being enclosed by first on first bracket 13, the stress being subject to due to the corner of foundation ditch Greatly, it is therefore desirable to again by the first angle brace 22 in first of fish belly sill tool-type combination installed in adjacent first enclose purlin 21 it Between, and make first angle brace 22 enclose purlin 21 with described first to be fastenedly connected, not only play a supporting role to foundation ditch, and can be with Improve the integral rigidity of pre-loaded support struts system;The first web member in first of fish belly sill tool-type combination is then installed 23, the first web member 23 is arranged on described first and enclose on purlin 21, specifically, described first to enclose purlin 21 and first web member 23 logical Cross welding and bolt is attached, finally, the first steel strand wires 24 are installed, purlin 21, the first web member 23 and institute are enclosed by described first That states that the first steel strand wires 24 are assembled into fish belly shape structure encloses purlin.
In the step S2, prestressed method is applied to first of 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 the steel of tensioning first During twisted wire 24, tensioning position and connecting portion are checked(At foundation bolt and bolt connection)Row construction again after qualified, so as to Reach control and reduce the deformation of fish belly sill, by applying prestressing force to first of fish belly sill tool-type combination so as to favourable In applying preload to the whole excavation face in foundation ditch periphery, prevent the sedimentation of periphery ground.
In the step S3, continue earth excavation, install before second fish belly sill tool-type combination 40, first by earth excavation To the operation side of second anchoring body 32, the second anchoring body 32 is constructed, makes the second anchoring body 32 It is connected with the interlocking pile 11, the soil pressure on foundation ditch is further counteracted by the second anchoring body 32, treats described After the completion of the construction of two road anchoring bodys 32, second fish belly sill tool-type combination 40 is installed, so as to be conducive to control foundation ditch in level Deformation on direction.The construction method of wherein described second anchoring body 32 is identical with the construction method of first of anchoring body 31, It is not repeated.
In addition, when second fish belly sill tool-type combination 40 is installed, by the in second fish belly sill tool-type combination 40 Two enclose purlin on the second bracket 14, and second bracket 14 is arranged on the interlocking pile 11;Setting described in addition During the second bracket 14, second bracket 14 and second is controlled to enclose the center line of purlin on same horizontal plane.Specifically, by institute State second one end for enclosing purlin and force transmission element 30 to weld, then the other end and the interlocking pile 11 of the force transmission element 30 are welded, from And the second fish belly sill tool-type combination 40 is fixed on the interlocking pile 11.Purlin is enclosed installed in described second by second After on 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 sill tool-type group Close the second angle brace in 40 and be arranged on adjacent second and enclose between purlin, and second angle brace is enclosed purlin fastening with described second and connect Connect, not only foundation ditch is played a supporting role, and the integral rigidity of pre-loaded support struts system can be improved;Then described is installed The second web member in two road fish belly sill tool-type combinations 40, makes the second web member be arranged on described second and encloses on purlin, specifically, described Second encloses purlin and second web member is attached by welding and bolt, finally, installs the second steel strand wires, described second is enclosed What purlin, the second web member and second steel strand wires were assembled into fish belly shape structure encloses purlin.
Similarly, prestressed method is applied to the second fish belly sill tool-type combination 40 and to first of 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, the then steel strand wires of tensioning second, and during the second steel strand wires of tensioning check tensioning position and connecting portion (At foundation bolt and bolt connection)Row construction again after qualified, so as to reach control and reduce the deformation of fish belly sill, passes through Apply prestressing force to the second fish belly sill tool-type combination 40 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, is supported by the support beam and above-mentioned by described encloses what purlin, web member and the steel strand wires were assembled into 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 per pass angle brace is installed, close on inspection It is in place by position progress integral hoisting after lattice.And the tensioning for steel strand wires should be carried out by root in order, it is considered to because between steel beam The influence of frictional resistance, tensioning is to design stress, i.e. first time tensioning to 50% in three times, and second of tensioning to 70%, third time is opened 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, axial reference point must be determined by enclosing before purlin is installed, calculated with total powerstation or theodolite by coordinate 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 foundation ditch, the purpose is to apply after prestressing force ensure outside building enclosure Uniform force.
Embodiment two:
The present embodiment is provided in a kind of method for dismounting of prestressing force fish belly sill tool-type combination inner support, embodiment 1 to be done Bottom of foundation ditch is poured after blinding concrete, and main pier bearing platform is arranged on and poured on the foundation ditch of blinding concrete, the main pier is treated The concrete strength of cushion cap reached after design strength, is started gradually to the second fish belly sill tool-type combination 40 and described First of fish belly sill tool-type combination 20 is removed.Wherein, first of 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, and are finally removed first and are enclosed Purlin 21.Similarly, when being removed to the second fish belly sill tool-type combination 40, the second steel strand wires are removed first, are then torn open Except the second web member, the second angle brace is then removed, second is finally removed and encloses 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, until the intermediate plate in the anchorage can be taken away;Utilize 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 is held out against, adjustment billet is then taken out, 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, which is divided to, 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 moves down to make to enclose purlin to be 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 be using constructing structure support replacement load transfering strip meet the outer soil body in hole by 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 to fall during bracing members handling and cause safety and quality accident. Therefore fish belly sill tool-type combination is removed and must be finished in its bridge pier foundation in construction duration and reach form removal after design strength, 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, waits after stabilization Assembled steel support is removed again, to ensure the safety and stability of foundation ditch.
In the present invention, first of 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 installation method of prestressing force fish belly sill tool-type combination inner support of the present invention, is provided with along the inwall of the foundation ditch and stings Stake is closed, can effectively prevent that water and soil from entering foundation ditch, and interlocking pile formation closure cofferdam by the interlocking pile, make composition Supporting construction rigidity it is big, so as to be conducive to controlling the deformation of foundation pit side-wall;In the step S1, earth excavation is stung along described Close stake and collar tie beam is set, the interlocking pile uniform force can be made by the collar tie beam, so as to advantageously ensure that the firm of supporting construction Degree and stability, first of fish belly sill tool-type combination is arranged on the collar tie beam, makes first of fish belly sill tool-type Combination is fixed on the interlocking pile, so as to form common space-load system, is not only advantageous to control foundation ditch horizontal direction On deformation, and constructing operation face is big, is easy to earth excavation;In the step S2, to first of fish belly sill tool-type Combination applies prestressing force, by applying prestressing force, not only contributes to control the deformation of first of fish belly sill tool-type combination, And can effectively prevent the sedimentation of periphery ground;In the step S3, continue earth excavation, 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 sill instrument Formula combination applies prestressing force, so as to be conducive to controlling deformation and the periphery ground of the second fish belly sill tool-type combination Sedimentation;In the step S4, continue earth excavation until the bottom of the foundation ditch, bed course coagulation is poured in the bottom of foundation ditch Soil, so that while bottom of foundation ditch is smooth, reaching the effect of sealing.
2. steel strand wires are removed by the method for dismounting of prestressing force fish belly sill tool-type combination inner support of the present invention When, it is necessary first to stress is discharged, range request operation as symmetrical as possible was discharged, so as to be conducive to structure stress balanced.Specifically, Socket wrench specially adapted for it is put into anchorage first;Using steel strand wires release tension steel strand, until that can take away in the anchorage Intermediate plate;Utilize the intermediate plate in tip pliers separation of steel twisted wire and anchorage;Discharge the steel strand wires tension force;The intermediate plate of one end is whole After recovery, using the intermediate plate of the same method recycling other end, steel strand wires are finally reclaimed.
Obviously, above-described embodiment is only intended to clearly illustrate example, not to the restriction of embodiment.For For those of ordinary skill in the art, other multi-form changes can also be made on the basis of the above description or are become It is dynamic.There is no necessity and possibility to exhaust all the enbodiments.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 installation method of prestressing force fish belly sill tool-type combination inner support, wherein interlocking pile is provided with along the inwall of foundation ditch, And the interlocking pile formation closure cofferdam, it is characterised in that comprise the following steps:
Step S1:Earth excavation, sets collar tie beam, and first of fish belly sill tool-type combination is arranged on into described along the interlocking pile On collar tie beam;
Step S2:Prestressing force is applied to first of fish belly sill tool-type combination;
Step S3:Continue earth excavation, second fish belly sill tool-type combination is installed, and to the second fish belly sill tool-type Combination applies prestressing force;
Step S4:Continue earth excavation until the bottom of the foundation ditch, blinding concrete is poured in the bottom of foundation ditch.
2. the installation method of prestressing force fish belly sill tool-type combination inner support according to claim 1, it is characterised in that:Along institute While stating interlocking pile setting collar tie beam, install first in first of fish belly sill tool-type combination and enclose purlin, and pacify along the collar tie beam Fill described first and enclose purlin.
3. the installation method of prestressing force fish belly sill tool-type combination inner support according to claim 2, it is characterised in that:Install Described first is enclosed before purlin, and fluting sets the first bracket on the interlocking pile, and purlin is enclosed installed in first support by described first On the support of frame.
4. the installation method of prestressing force fish belly sill tool-type combination inner support according to claim 3, it is characterised in that:It is described After first encloses purlin on first bracket, then the first angle brace in first of fish belly sill tool-type combination installed Enclosed adjacent first between purlin, the first web member in first of fish belly sill tool-type combination is then installed, makes the first web member It is arranged on described first to enclose on purlin, finally, the first steel strand wires is installed, purlin, the first web member and described first are enclosed by described first What steel strand wires were assembled into fish belly shape structure encloses purlin.
5. the installation method of prestressing force fish belly sill tool-type combination inner support according to claim 1 or 4, it is characterised in that: Prestressed method is applied to first of fish belly sill tool-type combination as follows:First to first of fish belly sill tool-type group The first angle brace pressurization in conjunction, then the first steel strand wires in first of fish belly sill tool-type combination described in tensioning, and tensioning the Before one steel strand wires, many steel strand wires are reserved, the change finally according to foundation ditch lateral pressure to reserved steel strand wires carries out tensioning again.
6. the installation method of prestressing force fish belly sill tool-type combination inner support according to claim 2, it is characterised in that:Along institute State interlocking pile and collar tie beam is set, while install in first of fish belly sill tool-type combination first encloses comprising the following steps that for purlin:First The steel reinforcement cage of collar tie beam described in colligation, then installs described first and encloses purlin, and purlin is enclosed as the interior side form of the collar tie beam using described first Plate, finally, casting concrete is carried out to the collar tie beam.
7. the installation method of prestressing force fish belly sill tool-type combination inner support according to claim 1, it is characterised in that:It is described Step S0 is additionally provided with before step S1:Lattice column is constructed, and the construction and the construction of the interlocking pile of the lattice column Carry out simultaneously.
8. the installation method of prestressing force fish belly sill tool-type combination inner support according to claim 7, it is characterised in that:It is described After the completion of lattice column construction, first layer is carried out to the earthwork and excavated up to first of anchor construction scope of operation, then to first Anchoring body is constructed.
9. a kind of method for dismounting of prestressing force fish belly sill tool-type combination inner support, the foundation ditch bottom of the claim 1 to be done Portion is poured after blinding concrete, and main pier bearing platform is arranged on and poured on the foundation ditch of blinding concrete, it is characterised in that:Treat described The concrete strength of main pier bearing platform is reached after design strength, and the second fish belly sill tool-type combination is removed first, Then first of fish belly sill tool-type combination is removed again.
10. the method for dismounting of prestressing force fish belly sill tool-type combination inner support according to claim 9, it is characterised in that:It is right When first of fish belly sill tool-type combination is removed, in first of fish belly sill tool-type combination is removed first One steel strand wires, then remove the first web member in first of fish belly sill tool-type combination, then remove first of fish The first angle brace in web grider tool-type combination, first finally removed in first of fish belly sill tool-type combination encloses purlin;It is right When the second fish belly sill tool-type combination is removed, in the second fish belly sill tool-type combination is removed first Two steel strand wires, then remove the second web member in the second fish belly sill tool-type combination, then remove the second fish The second angle brace in web grider tool-type combination, second finally removed in the second fish belly sill tool-type combination encloses purlin.
CN201710213812.8A 2017-04-01 2017-04-01 The installation of prestressing force fish belly sill tool-type combination inner support and method for dismounting CN106958249A (en)

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Application publication date: 20170718