CN105256809B - A kind of utilization prestressing force H profile steel supporting construction carries out the construction method of supporting - Google Patents
A kind of utilization prestressing force H profile steel supporting construction carries out the construction method of supporting Download PDFInfo
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- CN105256809B CN105256809B CN201510619499.9A CN201510619499A CN105256809B CN 105256809 B CN105256809 B CN 105256809B CN 201510619499 A CN201510619499 A CN 201510619499A CN 105256809 B CN105256809 B CN 105256809B
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Abstract
The invention discloses a kind of utilization prestressing force H profile steel supporting construction carries out the construction method of supporting, its prestressing force H profile steel supporting construction includes multiple prestressing force supporting units, and each prestressing force supporting unit includes support pile, multiple bridle irons and presstressed reinforcing steel.Support pile is vertically arranged in the side for treating excavation pit, and multiple bridle irons are arranged on support pile from top to bottom, and one end of presstressed reinforcing steel is anchored in support pile bottom.Multiple prestressing force supporting units are squeezed into successively and treats excavation pit surrounding, multiple bridle irons towards excavation pit is treated, arrange Guan Liang on the top of prestressing force supporting unit, make prestressing force supporting unit entirety be formed with Guan Liang；Pulling force is applied by presstressed reinforcing steel, the upper end of prestressing force presstressed reinforcing steel is anchored in Guan Liang.The horizontal component of pulling force suffered by presstressed reinforcing steel is delivered to supporting construction, counteracts the part soil pressure of the soil body, improves supporting intensity, reduces the deformation of support pile；In addition, supporting construction can be reclaimed reuse, it is cost-effective.
Description
Technical field
The invention belongs to building field, and in particular to a kind of utilization prestressing force H profile steel supporting construction carries out the construction of supporting
Method.
Background technology
In Extra-Deep Foundation Pit, existing fender post generally adopts cast-in-situ bored pile or driven cast-in-place pile, and takes
The construction method of cast in situs.Such as application number 201420330061.X, entitled cast-type external prestressing steel tube concrete
Native stake and the utility model patent of supporting piling wall, including steel pipe, in the cast-in-place concrete layer of the steel duct and setting
The many presstressed reinforcing steels on the steel pipe, the presstressed reinforcing steel along steel pipe axis direction arrange, including top section, interlude and
Bottom section, the interlude are located on the outside of steel pipe, and top section and bottom section are entered on the inside of steel pipe through steel pipe tube wall, the upper end of the steel pipe
Opening, has an enclosed construction on bottom.Present invention also offers the supporting piling wall with aforementioned concrete-pile.By above-mentioned side
Formula, the cast-type external prestressing steel tube concrete pile of the present invention adopt external prestressing technique, and preferably pile body can be entered
Row constraint, there is provided stretching resistance, effectively limits deformation of the supporting piling wall in Excavation Process；In addition, can field fabrication,
Cost of transportation is saved, on the premise of ensureing that pattern foundation pit supporting structure is safe and reliable, reduces cost, reduction of erection time and easy construction.But
The cast-type stake must can excavate foundation trench after concrete reaches intensity requirement, and efficiency of construction is relatively low.
The utility model patent of application number 201420720609.1, discloses a kind of from anchoring prestress support pile, including
Concrete pile body, has at least one presstressed reinforcing steel inside the concrete pile body, the presstressed reinforcing steel is included near pile body bottom
The non-adherent section from anchoring bond section and close pile body top at end, is coated with a pre-buried flexible pipe, institute outside the non-adherent section
State and between pre-buried flexible pipe bottom and presstressed reinforcing steel, tighten connection, the presstressed reinforcing steel and pre-buried flexible pipe pass concrete-pile upwards
Body, the presstressed reinforcing steel bottom extend to concrete pile body bottom.By the way, present configuration advantages of simple, passes through
The anchor force during prestress application is provided from the bond stress between anchoring bond section and concrete, it is not necessary to which anchoring is installed
End anchorage can carry out prestress application, more convenient.The utility model improves of support pile itself by applying prestressing force
Intensity, but with the excavation of foundation ditch, suffered by support pile, the pressure of the soil body is incrementally increased, to prevent foundation pit side-wall soil deformation
It is excessive, supporting construction stability is affected, is needed to arrange multiple tracks support, is constructed cumbersome, and construction costs is high.
The utility model patent of application number 201420339975.2, discloses a kind of H-shaped pretensioning prestressed concrete pile,
Pile body cross-sectional form adopts traditional " H " shape structure, many pile arrangements then be spliced into continuous lattice overall structure.
Every side You Liangge abutments of stake, respectively groove and tongue, when splicing between stake and stake, tongue and groove is engaged.Present invention reference
H profile steel in steel construction, adds prestress thin wall structure, is incorporated in concrete support stake, increases a gear width on the edge of a wing, together
When also improve the moment of inertia and rigidity in section, with supporting intensity it is high, efficiency of construction is high, take up an area the comprehensive advantage such as few.But
This kind of concrete-pile can not be recycled and reused, high cost, and operate inconvenience.
For the problems referred to above, the utility model patent of application number 201420639760.2, disclose a kind of based on prestressing force
The recoverable prestressed muscle abnormity support pile of technology, including concrete pile body, have at least one inside the concrete pile body
Built-in pipe, the built-in pipe are u-shaped, and concrete pile body bottom, the built-in pipe are located at the bottom fold of the built-in pipe
Two ends pass the top of concrete pile body, U-shaped prestressing force presstressed reinforcing steel is equipped in the built-in pipe.By above-mentioned
Scheme discharges stretching end prestressing force after pile body completes main purpose, can be easily drawn out presstressed reinforcing steel by mechanical force,
Reach the purpose of recovery.
But this kind of support pile is suffered from the drawback that：1) presstressed reinforcing steel can only be reclaimed, and support pile sheet is in completing basis
There is no after construction recovery value；2), with the excavation of foundation ditch, suffered by supporting construction, the pressure of the soil body is incrementally increased, and is anti-
Only foundation pit side-wall soil deformation is excessive, affects supporting construction stability, needs to arrange one or multi-channel support, constructs cumbersome,
And construction costs is high.If prestressing force can be applied to supporting construction so as to produce the stress to outside hole, part soil pressure is offset, then
External force suffered by supporting construction will be significantly reduced, and reach the purpose for reducing that arrangement is supported.
The content of the invention
It is an object of the invention to provide the construction method that a kind of utilization prestressing force H profile steel supporting construction carries out supporting is solved
In prior art, deep foundation pit supporting structure stability is poor, be unable to recycling and support tedious process, unhandy skill
Art problem.
In order to solve above-mentioned technical problem, the present invention is achieved through the following technical solutions：
A kind of prestressing force H profile steel supporting construction, including multiple prestressing force supporting units and Guan Liang, the Guan Liang is arranged on pre-
The upper end of stress supporting unit, and multiple prestressing force supporting units are fixed together.
Each prestressing force supporting unit includes support pile, multiple bridle irons and presstressed reinforcing steel, and the support pile is H profile steel；
The bridle iron is vertically set on support pile from top to bottom, and bridle iron is arranged at support pile towards the side at foundation ditch center,
The length of the bridle iron is first incremented by from top to bottom successively decreases afterwards, and the end of all bridle irons is provided with stopping means, the steel
Bearing is H profile steel；The presstressed reinforcing steel passes sequentially through the stopping means on all bridle irons, and one end of presstressed reinforcing steel is anchored in props up
The bottom of fender pile, the other end are anchored in the Guan Liang of support pile upper end, and the presstressed reinforcing steel is domed under bridle iron support.It is logical
Setting stopping means are crossed so that every presstressed reinforcing steel will not be interfered during prestressing force is applied, it is ensured that whole supporting construction
Stability, the bridle iron be H profile steel.H profile steel edge of a wing width, lateral rigidity are big, bending resistance is strong, prevent from applying pre-
In stress path, bridle iron deformation, improves the rigidity and stability of whole supporting construction.
Further improve, on described each support pile, be provided with three or five or seven bridle irons.Phase on each support pile
The spacing of adjacent bridle iron is 1-3m.The bridle iron length positioned at support pile short transverse centre position is 0.5-0.9m.Institute
The length for stating support pile is 15m-30m.Geologic information, design of foundation pit depth and surrounding enviroment according to excavation pit is treated determine props up
Fender pile length, spacing and supporting construction arrangement etc., the length of design of foundation pit depth more ramus profundus fender pile is longer, and the quantity of bridle iron is got over
Many, the length of most long bridle iron is longer.
Further improve, according to the geologic information for treating excavation pit, determine presstressed reinforcing steel on each prestressing force supporting unit
Quantity, on each prestressing force supporting unit, the quantity of presstressed reinforcing steel is 3-5 roots, and design of foundation pit depth is deeper, each prestressing force
On supporting unit, the quantity of presstressed reinforcing steel is more.
Further improve, the spaced set from top to bottom of the multiple bridle irons on described each support pile increases prestressing force
The rigidity of supporting unit.
Further improve, the surface that the stopping means are contacted with presstressed reinforcing steel is arc, reduce presstressed reinforcing steel with limit
The friction of position device, reduces abrasion, improves the service life of presstressed reinforcing steel.
Further improve, the bridle iron is connected with support pile by welding, increase bridle iron strong with the connection of support pile
Degree, it is ensured that the stability of whole supporting construction.
Further improve, on the web of the H profile steel of the support pile and bridle iron, be provided with multiple floors of putting more energy into, improve and prop up
The stability of protection structure.
A kind of utilization prestressing force H profile steel supporting construction carries out the construction method of supporting, comprises the following steps：
Step one, precast prestressed supporting unit：According to the projected depth for treating excavation pit, select support pile length and
The spacing of the quantity of bridle iron and adjacent bridle iron on each support pile, the length of support pile is 1.4-2.0 times of foundation depth,
On each support pile, bridle iron is three or five or seven, and on each support pile, the spacing of adjacent bridle iron is 1-3m, upper
In the range of stating, and under the conditions of identical geology, increase with the length that design of foundation pit depth increases support pile, on each support pile
Bridle iron quantity increase, by select support pile be fixedly connected with bridle iron, one end of presstressed reinforcing steel is anchored in support pile
Bottom, the other end of presstressed reinforcing steel passes sequentially through the stopping means on all bridle irons.
Step 2, piling：Multiple prestressing force supporting units are squeezed into successively the surrounding for treating excavation pit using pile driving equipment,
Support pile arranges the side of bridle iron towards foundation ditch center, and the spacing of adjacent support pile is 0.8-1.6m, within this range, and
Under the conditions of identical geology, as the spacing that design of foundation pit depth increases adjacent support pile reduces.Deeply wait out the lower end of support pile
Dig below Foundation Pit bottom, it is ensured that when prestressing force is applied, the bottom of foundation ditch soil body is improve and propped up to the supporting role of support pile lower end
The stability of fender pile.
Step 3, setting Guan Liang：Guan Liang is set on the top of prestressing force supporting unit, all prestressing force is propped up by Guan Liang
Shield unit is fixed together；So that all prestressing force supporting units form an entirety with Guan Liang, it is ensured that whole supporting
The stability of structure.
Step 4, applying prestressing force：Pulling force is applied to presstressed reinforcing steel by prestress application device, it is ensured that each prestressing force
Many presstressed reinforcing steels of supporting unit are subject to identical pulling force, and the upper end of prestressing force presstressed reinforcing steel is anchored in Guan Liang.
Step 5, excavation of foundation pit：Excavation of foundation pit is carried out, and as the increase of excavation of foundation pit depth steps up presstressed reinforcing steel
Prestressing force, when excavation of foundation pit is to hole bottom, prestressing force presstressed reinforcing steel upper end is anchored in Guan Liang.With the increasing of excavation of foundation pit depth
Plus, the lateral pressure increase of the foundation pit side-wall soil body then needs to step up side pressure of the presstressed reinforcing steel prestressing force to resist soil mass of foundation pit
Power.
Step 6, carry out Underground Construction.
Step 7, supporting unit are reclaimed：Underground Construction backfills the earthwork after finishing, remove supporting construction, then successively
Presstressed reinforcing steel prestressing force is discharged, and is removed Guan Liang, prestressing force supporting unit is reclaimed using pile pulling device.
Further improve, the step 3 arranges at least one support towards the side at foundation ditch center in Guan Liang after completing
Structure.When foundation ditch is one side supporting, the other end of supporting construction is supported on the soil body of foundation ditch another side；When foundation ditch is two-sided
When supporting or three face supportings or four sides supporting, the other end of supporting construction is supported in the Guan Liang of foundation ditch another side, by arranging
Supporting construction resists the lateral pressure of foundation ditch soil at both sides, further improves the supporting effect of supporting construction.
Because the length of the multiple bridle irons on each support pile is first incremented by from top to bottom successively decreasing afterwards, presstressed reinforcing steel stress
Curved after tight, then the horizontal component of pulling force suffered by presstressed reinforcing steel is applied to support pile, equivalent to support pile to foundation pit side-wall soil
Body applies outside thrust, has resisted the lateral pressure of the soil body well, has reduced the quantity of supporting construction, cost-effective.And with
The length for most long bridle iron is longer, and presstressed reinforcing steel is bigger with the angle of support pile, then the level of pulling force suffered by presstressed reinforcing steel point
Amount is bigger, bigger to the resistance of the foundation pit side-wall soil body.Further, since multiple bridle irons are provided with each support pile so that
The intensity of support pile itself is improved, and can effectively prevent support pile and become because the lateral pressure of prestressing force or the soil body is applied
Shape.
Compared with prior art, the invention has the beneficial effects as follows：
1st, prestressing force H profile steel supporting construction of the present invention and its construction method, by support pile arrange bridle iron and
Presstressed reinforcing steel, curved after the tensioning of presstressed reinforcing steel stress, then the horizontal component of pulling force suffered by presstressed reinforcing steel is applied to support pile, phase
When outside thrust is applied to the foundation pit side-wall soil body in support pile, then the lateral pressure of the soil body is resisted, supporting intensity has been improve.
2nd, prestressing force H profile steel supporting construction of the present invention and its construction method, by applying prestressing force to presstressed reinforcing steel
To resist the lateral pressure of the foundation pit side-wall soil body, the quantity of support is reduced.
3rd, prestressing force H profile steel supporting construction of the present invention and its construction method, support pile are H profile steel or steel sheet pile, steel
Bearing is H profile steel, and H profile steel edge of a wing width, lateral rigidity are big, bending resistance is strong, prevents the bridle iron during prestressing force is applied from becoming
Shape, improves the rigidity and stability of whole supporting construction.
4th, prestressing force H profile steel supporting construction of the present invention and its construction method, stopping means and prestressing force presstressed reinforcing steel
The surface for contacting is arc-shaped curved surface, reduces the friction of presstressed reinforcing steel and stopping means, reduces abrasion, improves making for presstressed reinforcing steel
Use the life-span.
5th, prestressing force H profile steel supporting construction of the present invention and its construction method, according to treat excavation pit geologic information,
Foundation depth and surrounding enviroment determine the spacing of the length of support pile, the quantity of bridle iron, the length of bridle iron and bridle iron,
It is easy to operate.
6th, prestressing force H profile steel supporting construction of the present invention and its construction method, it is the piling bar of supporting unit, bridle iron, pre-
Stress rib and presstressed reinforcing steel can be prefabricated in the factory, be assembled with the anchoring of support pile bottom, and the scene of being transported to directly can be squeezed into, and make
Can reclaim with after the completion of, reuse, it is cost-effective.
Description of the drawings
Fig. 1 is a kind of schematic diagram of prestressing force H profile steel supporting construction containing three bridle irons.
Fig. 2 is the side view of bridle iron.
Fig. 3 is a kind of schematic diagram of prestressing force H profile steel supporting construction containing five bridle irons.
Fig. 4 is the top view of Fig. 3
Fig. 5 is a kind of schematic diagram of prestressing force H profile steel supporting construction containing seven bridle irons.
Fig. 6 is a kind of schematic diagram of prestressing force H profile steel supporting construction containing three bridle irons and supporting construction.
Specific embodiment
To make the purpose of the present invention and technical scheme clearer, below in conjunction with skill of the embodiment of the present invention to the present invention
Art scheme is clearly and completely described.
As Figure 1-3, a kind of prestressing force H profile steel supporting construction, including multiple prestressing force supporting units, it is the plurality of pre-
Stress supporting unit is connected together by the Guan Liang 2 for being fixed thereon end, and multiple supporting constructions 6 are provided between Guan Liang 2.It is described
Each prestressing force supporting unit includes support pile 1, multiple bridle irons 3 and presstressed reinforcing steel 4, and support pile 1 is vertically arranged in be waited to excavate
Below Foundation Pit bottom is goed deep in the side of foundation ditch, the lower end of support pile 1, and support pile 1 is H profile steel or steel sheet pile, and bridle iron 3 is H types
Steel；The plurality of bridle iron 3 is vertically set on support pile 1 from top to bottom, and multiple bridle irons 3 are towards excavation pit is treated, more
The length of individual bridle iron 3 is first incremented by from top to bottom successively decreases afterwards；The end of the plurality of bridle iron 3 is provided with stopping means 5；In advance
Stress rib 4 passes sequentially through the stopping means 5 on all bridle irons 3, and one end of presstressed reinforcing steel 4 is anchored in the bottom of support pile 1, separately
One end is anchored in the Guan Liang 2 of 1 upper end of support pile.
The method constructed using above-mentioned prestressing force H profile steel supporting construction, is comprised the following steps：
Step one, according to treat excavation pit geologic information, dig depth and surrounding enviroment condition determine support pile 1 length,
The spacing of adjacent bridle iron 3 on the quantity of bridle iron 3, the length of bridle iron 3 and each prestressing force supporting unit, by prestressing force
One end of muscle 4 is anchored in the bottom of support pile 1, and the other end of presstressed reinforcing steel passes sequentially through the stopping means on all bridle irons 3
5, precast prestressed supporting unit.
Step 2, multiple prestressing force supporting units are squeezed into using pile driving equipment the surrounding for treating excavation pit, supporting successively
Stake 1 arranges the side of bridle iron 3 towards foundation ditch center；Below Foundation Pit bottom is goed deep in the lower end of support pile 1, it is ensured that to presstressed reinforcing steel
During 4 applying prestressing force, the bottom of foundation ditch soil body is played a supporting role to 1 lower end of support pile, improves the stability of support pile 1.
Step 3, Guan Liang 2 is set on the top of prestressing force supporting unit, by Guan Liang 2 by all prestressing force supporting units
It is fixed together；So that all prestressing force supporting units form an entirety with Guan Liang 2, it is ensured that whole supporting construction
Stability.
Step 4, by prestress application device to presstressed reinforcing steel 4 apply prestressing force, tensioned prestressing bar 4, it is ensured that each
Many prestressing force presstressed reinforcing steels 4 of prestressing force supporting unit are subject to identical pulling force, and the upper end of prestressing force presstressed reinforcing steel 4 is anchored
In Guan Liang 2.
Step 5, carry out excavation of foundation pit, and with the increase of excavation of foundation pit depth steps up the pre- of presstressed reinforcing steel 4 should
Power, when excavation of foundation pit is to hole bottom, 4 upper end of prestressing force presstressed reinforcing steel is anchored in Guan Liang.With the increase of excavation of foundation pit depth,
The lateral pressure increase of the foundation pit side-wall soil body, then need to step up 4 prestressing force of presstressed reinforcing steel to resist the lateral pressure of soil mass of foundation pit.
Step 6, Underground Construction is carried out, complete the construction such as base plate, side wall, middle plate, top board, support replacement, underground waterproof.
Step 7, backfill support pile 1 and the interpore earthwork of outer wall of basement, then discharge the pre- of presstressed reinforcing steel 4 successively
Stress, dismounting Guan Liang 2, recovery supporting construction.Supporting construction is reclaimed to reuse, it is cost-effective.
The length of the multiple bridle irons 3 on each support pile 1 is first incremented by from top to bottom successively decreases afterwards, 4 stress of presstressed reinforcing steel
Curved after tight, then the horizontal component of suffered pulling force is applied to support pile 1 by prestressing force presstressed reinforcing steel 4, equivalent to support pile 1 pair
The foundation pit side-wall soil body applies outside thrust, has resisted the lateral pressure of the soil body well, has reduced the quantity of supporting construction 6, saves
About cost.Further, since being provided with multiple bridle irons 3 on each support pile 1 so that support pile 1 intensity of itself is improved,
Support pile 1 can effectively be prevented and deformed because the lateral pressure of prestressing force or the soil body is applied.
Embodiment one：
Geologic information, projected depth and surrounding enviroment condition according to excavation pit is treated determines the length of support pile 1, steel
The spacing of adjacent bridle iron 3 in the quantity of seat 3, the length of bridle iron 3 and each prestressing force supporting unit, by presstressed reinforcing steel 4
One end be anchored in the bottom of support pile 1, the other end of presstressed reinforcing steel passes sequentially through the stopping means 5 on all bridle irons 3, in advance
Prestressing force supporting unit processed.
As shown in figure 1, the length of the support pile 1 is 15m, and excavation of foundation pit depth 10m, 1 spacing of adjacent support pile is
1.6m, is provided with three bridle irons 3 on each support pile 1, on each support pile 1, the maximum of 3 spacing of adjacent bridle iron is 3m,
Minima is 1m, and most long 3 length of bridle iron is 0.5m, is provided with three prestressing force pre- on described each prestressing force supporting unit
Stress rib 4, the nominal diameter of every prestressing force presstressed reinforcing steel 4 is 15.2mm, and support pile 1 deeply cheats below bottom 5m.
Embodiment two：
As shown in figure 4, the length of the support pile 1 is 18m, and excavation of foundation pit depth 12m, 1 spacing of adjacent support pile is
Five bridle irons 3 are provided with 1.2m each support pile 1, the maximum of 3 spacing of adjacent bridle iron is 3m on each support pile 1,
Minima is 1m, and most long 3 length of bridle iron is 0.7m, is provided with four prestressing force prestressing force on each prestressing force supporting unit
Muscle 4, the nominal diameter of every prestressing force presstressed reinforcing steel 4 is 15.2mm, and support pile 1 deeply cheats below bottom 6m.
Embodiment three：
As shown in figure 5, the length of the support pile 1 is 30m, and excavation of foundation pit depth 15m, 1 spacing of adjacent support pile is
0.8m, is provided with seven bridle irons 3 on each support pile 1, on each support pile 1, the maximum of 3 spacing of adjacent bridle iron is 3m,
Minima is 1m, and most long 3 length of bridle iron is 0.9m, is provided with five prestressing force prestressing force on each prestressing force supporting unit
Muscle 4, the nominal diameter of every prestressing force presstressed reinforcing steel 4 is 15.2mm, and support pile 1 deeply cheats below bottom 15m.
Example IV：
As shown in fig. 6, further improving on the basis of embodiment one, the Guan Liang 2 is set towards the side at foundation ditch center
It is equipped with a supporting construction 6, foundation ditch is four sides supporting, the other end of supporting construction 6 is supported in the Guan Liang 2 of foundation ditch another side,
The lateral pressure of foundation ditch soil at both sides is resisted by arranging supporting construction 6, the supporting effect of supporting construction is further improved.Other knots
Structure or step with it is identical in embodiment one.
Do not do in the present invention illustrate be prior art or be capable of achieving by prior art, and the present invention
Described in be embodied as case be only the present invention preferable case study on implementation, not for limit the present invention practical range.
The equivalence changes made by i.e. all contents according to scope of the present invention patent and modification, all should be used as the technology category of the present invention.
Claims (9)
1. a kind of utilization prestressing force H profile steel supporting construction carries out the construction method of supporting, it is characterised in that
The prestressing force H profile steel supporting construction includes multiple prestressing force supporting units and Guan Liang (2), and the Guan Liang (2) is arranged on
The upper end of prestressing force supporting unit, and multiple prestressing force supporting units are fixed together；
Each prestressing force supporting unit includes：
Support pile (1), the support pile (1) is H profile steel；
At least three bridle irons (3), the bridle iron (3) are vertically set on support pile (1) from top to bottom, and bridle iron (3) sets
It is placed in side of the support pile (1) towards foundation ditch center, and the length of bridle iron (3) is first incremented by from top to bottom and successively decreases afterwards, Suo Yougang
The end of bearing (3) is provided with stopping means (5), and the bridle iron (3) is H profile steel；
Presstressed reinforcing steel (4), the presstressed reinforcing steel (4) pass sequentially through the stopping means (5) on all bridle irons (3), presstressed reinforcing steel
(4) one end is anchored in the bottom of support pile (1), and the other end is anchored in the Guan Liang (2) of support pile (1) upper end, it is described it is pre- should
Power muscle (4) is domed under bridle iron (3) support；
The method for protecting support is comprised the following steps：
Step one, precast prestressed supporting unit：According to the projected depth for treating excavation pit, select support pile (1) length and
The quantity of bridle iron (3) on each support pile (1), the length of support pile (1) is 1.4-2.0 times of foundation depth, each support pile
(1) on, bridle iron (3) is three or five or seven, and on each support pile (1), the spacing of adjacent bridle iron (3) is 1-3m, will
Selected support pile (1) is fixedly connected with bridle iron (3), and one end of presstressed reinforcing steel (4) is anchored in the bottom of support pile (1), in advance
The other end of stress rib (4) passes sequentially through the stopping means (5) on all bridle irons (3)；
Step 2, piling：Multiple prestressing force supporting units are squeezed into successively the surrounding for treating excavation pit, supporting using pile driving equipment
Stake (1) arranges the side of bridle iron (3) towards foundation ditch center, and the spacing of adjacent support pile (1) is 0.8-1.6m；
Step 3, setting Guan Liang (2)：On the top of prestressing force supporting unit, Guan Liang (2) is set, will be all pre- by Guan Liang (2)
Stress supporting unit is fixed together, and makes all prestressing force supporting units form an entirety with Guan Liang (2)；
Step 4, applying prestressing force：By prestress application device to presstressed reinforcing steel (4) apply prestressing force, it is ensured that each it is pre- should
Many presstressed reinforcing steels (4) of power supporting unit are anchored at presstressed reinforcing steel (4) upper end in Guan Liang (2) by identical pulling force；
Step 5, excavation of foundation pit：Excavation of foundation pit is carried out, and as the increase of excavation of foundation pit depth steps up presstressed reinforcing steel (4)
Prestressing force；
Step 6, carry out Underground Construction；
Step 7, supporting unit are reclaimed：Underground Construction backfills the earthwork after finishing, discharge the prestressing force of presstressed reinforcing steel (4), tear open
Except supporting construction (6), Guan Liang (2) and using pile pulling device reclaim prestressing force supporting unit.
2. utilization prestressing force H profile steel supporting construction according to claim 1 carries out the construction method of supporting, and its feature exists
In the step 3 arranges at least one supporting construction (6) towards the side at foundation ditch center in Guan Liang (2) after completing.
3. utilization prestressing force H profile steel supporting construction according to claim 1 carries out the construction method of supporting, and its feature exists
In three or five or seven bridle irons (3) are provided with each support pile (1).
4. the utilization prestressing force H profile steel supporting construction according to claim 1 or 3 carries out the construction method of supporting, its feature
It is that the spacing of adjacent bridle iron (3) is 1-3m on each support pile (1).
5. utilization prestressing force H profile steel supporting construction according to claim 4 carries out the construction method of supporting, and its feature exists
In on support pile (1), the length of most long bridle iron (3) is 0.5-0.9m.
6. utilization prestressing force H profile steel supporting construction according to claim 1 carries out the construction method of supporting, and its feature exists
In the surface that the stopping means (5) are contacted with presstressed reinforcing steel (4) is arc.
7. utilization prestressing force H profile steel supporting construction according to claim 1 carries out the construction method of supporting, and its feature exists
In the bridle iron (3) is connected with support pile (1) by welding.
8. utilization prestressing force H profile steel supporting construction according to claim 1 carries out the construction method of supporting, and its feature exists
In the length of the support pile (1) is 15m-30m.
9. utilization prestressing force H profile steel supporting construction according to claim 1 carries out the construction method of supporting, and its feature exists
In being provided with floor of putting more energy on the web of the H profile steel of the support pile (1) and bridle iron (3).
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| CN110886298A (en) * | 2019-12-03 | 2020-03-17 | 珠海小可乐科技有限公司 | Novel deep foundation pit supporting structure |
| CN113529746A (en) * | 2021-08-26 | 2021-10-22 | 中冶建筑研究总院（深圳）有限公司 | Recyclable prestress supporting system and construction method |
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| JPH08144284A (en) * | 1994-11-17 | 1996-06-04 | Nishimatsu Constr Co Ltd | Landslide protection wall timbering |
| KR20040031451A (en) * | 2002-10-07 | 2004-04-13 | 한만엽 | Prestressed scaffolding method |
| KR100571102B1 (en) * | 2003-02-14 | 2006-04-13 | 한만엽 | Device of Innovative Prestressed Scaffolding System for Improving Workability |
| WO2007058463A1 (en) * | 2005-11-16 | 2007-05-24 | Supportec Co., Ltd. | Apparatus for fixing a wale |
| KR20090043625A (en) * | 2007-10-30 | 2009-05-07 | 이호찬 | Method for constructing underground slabs using asymmetric girder |
| CN202347525U (en) * | 2011-11-15 | 2012-07-25 | 浙江华铁建筑安全科技股份有限公司 | Prestress bow-shaped steel circuit purlin |
| CN203113352U (en) * | 2013-03-13 | 2013-08-07 | 上海强劲地基工程股份有限公司 | Pre-stressed beam for retaining and protection of foundation pit |
| CN104790408B (en) * | 2015-04-15 | 2016-08-24 | 叶长青 | Irregular foundation pit construction method |
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