CN105256809A - Prestressed H-type steel supporting structure and construction method thereof - Google Patents
Prestressed H-type steel supporting structure and construction method thereof Download PDFInfo
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- CN105256809A CN105256809A CN201510619499.9A CN201510619499A CN105256809A CN 105256809 A CN105256809 A CN 105256809A CN 201510619499 A CN201510619499 A CN 201510619499A CN 105256809 A CN105256809 A CN 105256809A
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Abstract
The invention discloses a prestressed H-type steel supporting structure and a construction method thereof. The prestressed H-type steel supporting structure comprises a plurality of prestressed supporting units. Each prestressed supporting unit comprises a supporting pile, a plurality of steel supports and prestressed bars, wherein the supporting pile is vertically arranged on one side of a foundation pit to be excavated, the steel supports are arranged on the supporting pile from top to bottom, and one end of each prestressed bar is anchored to the lower portion of the supporting pile. The prestressed supporting units are sequentially driven into the periphery of the foundation pit to be excavated, the steel supports all face the foundation pit to be excavated, a top beam is arranged at the top end of each prestressed supporting unit, and each prestressed supporting unit and the corresponding top beam are integrated. Tensile force is applied to the prestressed bars, and the upper ends of the prestressed bars are anchored to the top beams. The horizontal component of the tensile force borne by the prestressed bars is transferred to the supporting structure, and therefore partial soil pressure of soil is counteracted, the supporting strength is improved, and deformation of the supporting piles is reduced. In addition, the supporting structure can be recycled, and therefore the cost is reduced.
Description
Technical field
The invention belongs to building field, be specifically related to a kind of prestressing force H profile steel supporting and protection structure and construction method thereof.
Background technology
When Extra-Deep Foundation Pit, existing fender post adopts bored pile or tube-sinking cast-in-situ pile usually, and all takes the construction method of cast in situs.As application number 201420330061.X, denomination of invention is the utility model patent of Cast-in-situs type external prestressing steel tube concrete pile and supporting piling wall, comprise steel pipe, at the cast-in-place layer of concrete of described steel duct and many presstressed reinforcing steels being arranged on described steel pipe, described presstressed reinforcing steel is arranged along the axis direction of steel pipe, comprise top section, interlude and end section, described interlude is positioned at outside steel pipe, top section and end section run through steel pipe tube wall and enter inside steel pipe, the upper end open of described steel pipe, bottom has an enclosed construction.Present invention also offers the supporting piling wall with aforementioned concrete pile.By the way, Cast-in-situs type external prestressing steel tube concrete pile of the present invention adopts external prestressing technique, better can retrain pile body, provide stretching resistance, effectively limit the distortion of supporting piling wall in Excavation Process; In addition, can field fabrication, save cost of transportation, ensureing, under the prerequisite that pattern foundation pit supporting structure is safe and reliable, to reduce costs, reduction of erection time and easy construction.But described Cast-in-situs type stake must can excavate foundation trench after concrete reaches requirement of strength, and efficiency of construction is lower.
The utility model patent of application number 201420720609.1, disclose a kind of from anchoring prestress soldier pile, comprise concrete pile body, described concrete pile body inside has at least one presstressed reinforcing steel, described presstressed reinforcing steel comprise near pile body bottom from anchoring bond section with near the non-adherent section on pile body top, described non-adherent section outside is coated with a pre-buried flexible pipe, described pre-buried flexible pipe bottom is connected with tightening between presstressed reinforcing steel, described presstressed reinforcing steel and pre-buried flexible pipe all upwards pass concrete pile body, and described presstressed reinforcing steel bottom extends to bottom concrete pile body.By the way, the present invention is simple and reasonable, and by providing the anchored force in prestress application process from the bond stress between anchoring bond section and concrete, not needing to install anchored end ground tackle can carry out prestress application, more convenient.This utility model improves the intensity of of soldier pile itself by Shi Hanzhang, but along with the excavation of foundation ditch, suffered by soldier pile, the pressure of the soil body progressively increases, for preventing foundation pit side-wall soil deformation excessive, affect supporting and protection structure stability, need to arrange multiple tracks to support, construct more loaded down with trivial details, and construction costs is high.
The utility model patent of application number 201420339975.2, discloses a kind of H-shaped pretensioning prestressed concrete pile, and pile body cross-sectional form adopts traditional " H " shape structure, and many pile arrangements then can be spliced into continuous print lattice overall structure.The You Liangge abutment, every side of stake, be respectively groove and tongue, when splicing between stake with stake, tongue and groove is engaged.H profile steel in reference steel structure of the present invention, add prestress thin wall structure, be incorporated in concrete support stake, strengthen a gear width on the edge of a wing, also improve moment of inertia and the rigidity in cross section simultaneously, there is the comprehensive advantages such as supporting intensity is high, efficiency of construction is high, occupation of land is few.But this kind of concrete pile can not recycle and reuse, cost is high, and operation inconvenience.
For the problems referred to above, the utility model patent of application number 201420639760.2, disclose a kind of recoverable prestressed muscle abnormity soldier pile based on prestressing technique, comprise concrete pile body, described concrete pile body inside has at least one built-in pipe, and described built-in pipe is U-shaped, and the bottom fold place of described built-in pipe is positioned at bottom concrete pile body, two ends of described built-in pipe pass the top of concrete pile body, are equipped with U-shaped prestressing force presstressed reinforcing steel in described built-in pipe.By such scheme after pile body completes main purpose, discharge stretching end prestressing force, presstressed reinforcing steel can be pulled out easily by mechanical force, reach the object of recovery.
But this kind of soldier pile exists following shortcoming: 1), can only reclaim presstressed reinforcing steel, and soldier pile does not originally have recovery value after completing foundation construction; 2), along with the excavation of foundation ditch, suffered by supporting and protection structure, the pressure of the soil body progressively increases, and for preventing foundation pit side-wall soil deformation excessive, affects supporting and protection structure stability, needs to arrange one or multi-channel support, construct more loaded down with trivial details, and construction costs is high.If can to supporting and protection structure Shi Hanzhang, make it produce to the stress outside hole, offset part soil pressure, then external force suffered by supporting and protection structure will significantly reduce, and reaches the object reducing and arrange and support.
Summary of the invention
The object of the present invention is to provide a kind of prestressing force H profile steel supporting and protection structure and construction method thereof, solve deep foundation pit supporting structure poor stability in prior art, can not recycling and support loaded down with trivial details, the unhandy technical problem of operation.
In order to solve the problems of the technologies described above, the present invention is achieved through the following technical solutions:
A kind of prestressing force H profile steel supporting and protection structure, comprise multiple prestressing force supporting unit and Guan Liang, described Guan Liang is arranged on the upper end of prestressing force supporting unit, and is fixed together by multiple prestressing force supporting unit.
Each prestressing force supporting unit comprises soldier pile, multiple steel support and presstressed reinforcing steel, and described soldier pile is H profile steel; Described steel support is vertically set on soldier pile from top to bottom, and steel support is arranged at the side of soldier pile towards foundation ditch center, the length of described steel support first increases progressively from top to bottom successively decreases afterwards, and the end of all steel supports is provided with stopping means, and described steel support is H profile steel; Described presstressed reinforcing steel is successively by the stopping means on all steel supports, and one end of presstressed reinforcing steel is anchored in the bottom of soldier pile, and the other end is anchored on the Guan Liang of soldier pile upper end, and described presstressed reinforcing steel is arch under steel support supports.By arranging stopping means, every root presstressed reinforcing steel can not mutually be interfered in Shi Hanzhang process, ensure the stability of whole supporting and protection structure, described steel support is H profile steel.The described H profile steel edge of a wing is wide, lateral rigidity is large, bending resistance is strong, prevents steel support distortion in Shi Hanzhang process, improves rigidity and the stability of whole supporting and protection structure.
Further improvement, described each soldier pile is provided with three or five or seven steel supports.On each soldier pile, the spacing of adjacent steel bearing is 1-3m.The described steel support length being positioned at soldier pile short transverse centre position is 0.5-0.9m.The length of described soldier pile is 15m-30m.According to treating the geologic information of excavation pit, the design of foundation pit degree of depth and surrounding enviroment determination soldier pile length, spacing and braced structures layout etc., the length of the design of foundation pit degree of depth more ramus profundus fender pile is longer, and the quantity of steel support is more, and the length of the longest steel support is longer.
Further improvement, according to the geologic information treating excavation pit, determine the quantity of presstressed reinforcing steel on each prestressing force supporting unit, on each prestressing force supporting unit, the quantity of presstressed reinforcing steel is 3-5 root, the design of foundation pit degree of depth is darker, and on each prestressing force supporting unit, the quantity of presstressed reinforcing steel is more.
Further improvement, the multiple steel supports spaced set from top to bottom on described each soldier pile, increases the rigidity of prestressing force supporting unit.
Further improvement, the surface that described stopping means contacts with presstressed reinforcing steel is arc, reduces the friction of presstressed reinforcing steel and stopping means, reduces wearing and tearing, improves the application life of presstressed reinforcing steel.
Further improvement, described steel support is connected with soldier pile by welding, increases the bonding strength of steel support and soldier pile, ensures the stability of whole supporting and protection structure.
Further improvement, the web of the H profile steel of described soldier pile and steel support is provided with multiple floor of putting more energy into, and improves the stability of supporting and protection structure.
Utilize prestressing force H profile steel supporting and protection structure to carry out a construction method for supporting, comprise the following steps:
Step one, precast prestressed supporting unit: according to the projected depth treating excavation pit, the quantity of steel support and the spacing of adjacent steel bearing on the length of selected soldier pile and each soldier pile, the length of soldier pile is 1.4-2.0 times of foundation depth, on each soldier pile, steel support is three or five or seven, on each soldier pile, the spacing of adjacent steel bearing is 1-3m, in above-mentioned scope, and under identical geological conditions, the length increasing soldier pile along with the design of foundation pit degree of depth increases, the quantity of the steel support on each soldier pile increases, selected soldier pile is fixedly connected with steel support, one end of presstressed reinforcing steel is anchored in the bottom of soldier pile, the other end of presstressed reinforcing steel is successively by the stopping means on all steel supports.
Step 2, piling: utilize pile driving equipment that multiple prestressing force supporting unit is squeezed into the surrounding treating excavation pit successively, soldier pile arranges the side of steel support towards foundation ditch center, the spacing of adjacent soldier pile is 0.8-1.6m, within the scope of this, and under identical geological conditions, the spacing increasing adjacent soldier pile along with the design of foundation pit degree of depth reduces.The excavation pit end, hole below, is deeply treated in the lower end of soldier pile, and ensure that when Shi Hanzhang, foundation ditch bottom soil body, to the supporting role of soldier pile lower end, improves the stability of soldier pile.
Step 3, Guan Liang is set: Guan Liang is set on the top of prestressing force supporting unit, is fixed together by all prestressing force supporting unit by Guan Liang; Make all prestressing force supporting unit and Guan Liang form an entirety, ensure that the stability of whole supporting and protection structure.
Step 4, Shi Hanzhang: apply pulling force to presstressed reinforcing steel by prestress application device, ensure that many presstressed reinforcing steels of each prestressing force supporting unit are subject to identical pulling force, be anchored on Guan Liang the upper end of prestressing force presstressed reinforcing steel.
Step 5, excavation of foundation pit: carry out excavation of foundation pit, and progressively improve presstressed reinforcing steel prestressing force along with the increase of the excavation of foundation pit degree of depth, when excavation of foundation pit is to the end, hole, prestressing force presstressed reinforcing steel upper end is anchored on Guan Liang.Along with the increase of the excavation of foundation pit degree of depth, the lateral pressure of the foundation pit side-wall soil body increases, then need progressively to improve presstressed reinforcing steel prestressing force to resist the lateral pressure of soil mass of foundation pit.
Step 6, carry out Underground Construction.
Step 7, supporting unit reclaim: backfill the earthwork after Underground Construction, remove braced structures, then discharge presstressed reinforcing steel prestressing force successively, remove Guan Liang, utilize pile pulling device to reclaim prestressing force supporting unit.
Further improvement, arranges at least one braced structures at Guan Liang towards the side at foundation ditch center after described step 3 completes.When foundation ditch is one side supporting, the other end of braced structures is supported on the soil body of foundation ditch another side; When foundation ditch be two-sided supporting or three supportings or four sides supporting time, the other end of braced structures is supported on the Guan Liang of foundation ditch another side, by arranging the lateral pressure of braced structures opposing foundation ditch soil at both sides, improves the supporting effect of supporting and protection structure further.
Because the length of the multiple steel supports on each soldier pile first increases progressively from top to bottom and successively decreases afterwards, curved after the stressed tensioning of presstressed reinforcing steel, then suffered by presstressed reinforcing steel, the horizontal component of pulling force is applied to soldier pile, be equivalent to soldier pile and outside thrust is applied to the foundation pit side-wall soil body, good lateral pressure of resisting the soil body, decrease the quantity of braced structures, cost-saving.And along with the length of the longest steel support longer, the angle of presstressed reinforcing steel and soldier pile is larger, then suffered by presstressed reinforcing steel, the horizontal component of pulling force is larger, larger to the resistance of the foundation pit side-wall soil body.In addition, due to each soldier pile being provided with multiple steel support, the intensity of soldier pile itself is improved, effectively can prevent soldier pile because of the lateral pressure of Shi Hanzhang or the soil body is out of shape.
Compared with prior art, the invention has the beneficial effects as follows:
1, prestressing force H profile steel supporting and protection structure of the present invention and construction method thereof, by arranging steel support and presstressed reinforcing steel to soldier pile, curved after the stressed tensioning of presstressed reinforcing steel, then suffered by presstressed reinforcing steel, the horizontal component of pulling force is applied to soldier pile, be equivalent to soldier pile and outside thrust is applied to the foundation pit side-wall soil body, then resist the lateral pressure of the soil body, improve supporting intensity.
2, prestressing force H profile steel supporting and protection structure of the present invention and construction method thereof, by resisting the lateral pressure of the foundation pit side-wall soil body to presstressed reinforcing steel Shi Hanzhang, decreases the quantity of support.
3, prestressing force H profile steel supporting and protection structure of the present invention and construction method thereof, soldier pile is H profile steel or steel sheet pile, steel support is H profile steel, the H profile steel edge of a wing is wide, lateral rigidity is large, bending resistance is strong, prevent steel support distortion in Shi Hanzhang process, improve rigidity and the stability of whole supporting and protection structure.
4, prestressing force H profile steel supporting and protection structure of the present invention and construction method thereof, the surface that stopping means contacts with prestressing force presstressed reinforcing steel is arc-shaped curved surface, reduces the friction of presstressed reinforcing steel and stopping means, reduces wearing and tearing, improves the application life of presstressed reinforcing steel.
5, prestressing force H profile steel supporting and protection structure of the present invention and construction method thereof, according to the spacing treating the length of the geologic information of excavation pit, foundation depth and surrounding enviroment determination soldier pile, the quantity of steel support, the length of steel support and steel support, easy to operate.
6, prestressing force H profile steel supporting and protection structure of the present invention and construction method thereof, anchoring bottom the piling bar of supporting unit, steel support, presstressed reinforcing steel and presstressed reinforcing steel and soldier pile all can be prefabricated in the factory, assemble, the scene of being transported to can directly be squeezed into, can reclaim after being used to complete, recycling, cost-saving.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of prestressing force H profile steel supporting and protection structure containing three steel supports.
Fig. 2 is the lateral view of steel support.
Fig. 3 is the schematic diagram of a kind of prestressing force H profile steel supporting and protection structure containing five steel supports.
Fig. 4 is the top view of Fig. 3
Fig. 5 is the schematic diagram of a kind of prestressing force H profile steel supporting and protection structure containing seven steel supports.
Fig. 6 is the schematic diagram that a kind of prestressing force H profile steel supporting and protection structure contains three steel supports and braced structures.
Detailed description of the invention
For making object of the present invention and technical scheme clearly, below in conjunction with the embodiment of the present invention, technical scheme of the present invention is clearly and completely described.
As Figure 1-3, a kind of prestressing force H profile steel supporting and protection structure, comprises multiple prestressing force supporting unit, and described multiple prestressing force supporting unit is connected together by the hat beam 2 of end fixed thereon, is provided with multiple braced structures 6 between hat beam 2.Described each prestressing force supporting unit comprises soldier pile 1, multiple steel support 3 and presstressed reinforcing steel 4, soldier pile 1 is vertically arranged on the side for the treatment of excavation pit, the lower end of soldier pile 1 is goed deep into below at the bottom of Foundation Pit, and soldier pile 1 is H profile steel or steel sheet pile, and steel support 3 is H profile steel; Described multiple steel support 3 is vertically set on soldier pile 1 from top to bottom, and multiple steel support 3 is all towards treating excavation pit, and the length of multiple steel support 3 first increases progressively from top to bottom successively decreases afterwards; The end of described multiple steel support 3 is provided with stopping means 5; Presstressed reinforcing steel 4 is successively by the stopping means 5 on all steel supports 3, and one end of presstressed reinforcing steel 4 is anchored in the bottom of soldier pile 1, and the other end is anchored on the hat beam 2 of soldier pile 1 upper end.
Utilize above-mentioned prestressing force H profile steel supporting and protection structure to carry out the method for constructing, comprise the following steps:
Step one, according to the spacing treating adjacent steel bearing 3 on the geologic information of excavation pit, the length of digging dark and surrounding enviroment condition determination soldier pile 1, the quantity of steel support 3, the length of steel support 3 and each prestressing force supporting unit, one end of presstressed reinforcing steel 4 is anchored in the bottom of soldier pile 1, the other end of presstressed reinforcing steel passes through the stopping means 5 on all steel supports 3, precast prestressed supporting unit successively.
Step 2, utilize pile driving equipment that multiple prestressing force supporting unit is squeezed into the surrounding treating excavation pit successively, soldier pile 1 arranges the side of steel support 3 towards foundation ditch center; The lower end of soldier pile 1 is goed deep into below at the bottom of Foundation Pit, and when ensureing presstressed reinforcing steel 4 Shi Hanzhang, foundation ditch bottom soil body is played a supporting role to soldier pile 1 lower end, improves the stability of soldier pile 1.
Step 3, hat beam 2 is set on the top of prestressing force supporting unit, by hat beam 2, all prestressing force supporting unit is fixed together; Make all prestressing force supporting unit form an entirety with hat beam 2, ensure that the stability of whole supporting and protection structure.
Step 4, by prestress application device to presstressed reinforcing steel 4 Shi Hanzhang, tensioned prestressing bar 4, ensures that many prestressing force presstressed reinforcing steels 4 of each prestressing force supporting unit are subject to identical pulling force, the upper end of prestressing force presstressed reinforcing steel 4 is anchored at hat beam 2 on.
Step 5, carry out excavation of foundation pit, and progressively improve the prestressing force of presstressed reinforcing steel 4 along with the increase of the excavation of foundation pit degree of depth, when excavation of foundation pit is to the end, hole, prestressing force presstressed reinforcing steel 4 upper end is anchored on Guan Liang.Along with the increase of the excavation of foundation pit degree of depth, the lateral pressure of the foundation pit side-wall soil body increases, then need progressively to improve presstressed reinforcing steel 4 prestressing force to resist the lateral pressure of soil mass of foundation pit.
Step 6, carry out Underground Construction, complete the constructions such as base plate, side wall, middle plate, top board, support replacement, underground waterproof.
Step 7, backfill soldier pile 1 and the interpore earthwork of outer wall of basement, then discharge the prestressing force of presstressed reinforcing steel 4 successively, remove hat beam 2, reclaim supporting and protection structure.Supporting and protection structure is reclaimed again to utilize, cost-saving.
The length of the multiple steel supports 3 on each soldier pile 1 first increases progressively from top to bottom successively decreases afterwards, curved after the stressed tensioning of presstressed reinforcing steel 4, then the horizontal component of suffered pulling force is applied to soldier pile 1 by prestressing force presstressed reinforcing steel 4, be equivalent to soldier pile 1 pair of foundation pit side-wall soil body and apply outside thrust, good lateral pressure of resisting the soil body, decrease the quantity of braced structures 6, cost-saving.In addition, due to each soldier pile 1 being provided with multiple steel support 3, the intensity of soldier pile 1 itself is improved, effectively can prevent soldier pile 1 because of the lateral pressure of Shi Hanzhang or the soil body is out of shape.
Embodiment one:
According to the spacing treating adjacent steel bearing 3 on the length of the geologic information of excavation pit, projected depth and surrounding enviroment condition determination soldier pile 1, the quantity of steel support 3, the length of steel support 3 and each prestressing force supporting unit, one end of presstressed reinforcing steel 4 is anchored in the bottom of soldier pile 1, the other end of presstressed reinforcing steel passes through the stopping means 5 on all steel supports 3, precast prestressed supporting unit successively.
As shown in Figure 1, the length of described soldier pile 1 is 15m, excavation of foundation pit degree of depth 10m, adjacent soldier pile 1 spacing is 1.6m, each soldier pile 1 is provided with three steel supports 3, on each soldier pile 1, the maximum value of adjacent steel bearing 3 spacing is 3m, minimum value is 1m, and the longest steel support 3 length is 0.5m, and described each prestressing force supporting unit is provided with three prestressing force presstressed reinforcing steels 4, the nominal diameter of every root prestressing force presstressed reinforcing steel 4 is 15.2mm, and soldier pile 1 deeply cheats the end below 5m.
Embodiment two:
As shown in Figure 4, the length of described soldier pile 1 is 18m, excavation of foundation pit degree of depth 12m, adjacent soldier pile 1 spacing is that each soldier pile 1 of 1.2m is provided with five steel supports 3, and on each soldier pile 1, the maximum value of adjacent steel bearing 3 spacing is 3m, and minimum value is 1m, the longest steel support 3 length is 0.7m, each prestressing force supporting unit is provided with four prestressing force presstressed reinforcing steels 4, and the nominal diameter of every root prestressing force presstressed reinforcing steel 4 is 15.2mm, and soldier pile 1 deeply cheats the end below 6m.
Embodiment three:
As shown in Figure 5, the length of described soldier pile 1 is 30m, excavation of foundation pit degree of depth 15m, adjacent soldier pile 1 spacing is 0.8m, each soldier pile 1 is provided with seven steel supports 3, on each soldier pile 1, the maximum value of adjacent steel bearing 3 spacing is 3m, minimum value is 1m, and the longest steel support 3 length is 0.9m, and each prestressing force supporting unit is provided with five prestressing force presstressed reinforcing steels 4, the nominal diameter of every root prestressing force presstressed reinforcing steel 4 is 15.2mm, and soldier pile 1 deeply cheats the end below 15m.
Embodiment four:
As shown in Figure 6, the basis of embodiment one is improved further, described hat beam 2 is provided with a braced structures 6 towards the side at foundation ditch center, foundation ditch is four sides supporting, the other end of braced structures 6 is supported on the hat beam 2 of foundation ditch another side, resisting the lateral pressure of foundation ditch soil at both sides by arranging braced structures 6, improving the supporting effect of supporting and protection structure further.Identical with embodiment one of other structures or step.
Do not do in the present invention illustrate be prior art or can be realized by prior art, and described in the present invention, concrete case study on implementation is only better case study on implementation of the present invention, is not used for limiting practical range of the present invention.Namely all equivalences done according to the content of the present patent application the scope of the claims change and modify, all should as technology category of the present invention.
Claims (10)
1. a prestressing force H profile steel supporting and protection structure, is characterized in that, comprises the upper end that multiple prestressing force supporting unit and Guan Liang (2), described Guan Liang (2) are arranged on prestressing force supporting unit, and is fixed together by multiple prestressing force supporting unit;
Described each prestressing force supporting unit comprises:
Soldier pile (1), described soldier pile (1) is H profile steel;
At least three steel supports (3), described steel support (3) is vertically set on soldier pile (1) from top to bottom, steel support (3) is arranged at the side of soldier pile (1) towards foundation ditch center, and the length of steel support (3) first increases progressively from top to bottom and successively decreases afterwards, the end of all steel supports (3) is provided with stopping means (5), and described steel support (3) is H profile steel;
Presstressed reinforcing steel (4), described presstressed reinforcing steel (4) is successively by the stopping means (5) on all steel supports (3), one end of presstressed reinforcing steel (4) is anchored in the bottom of soldier pile (1), the other end is anchored on the Guan Liang (2) of soldier pile (1) upper end, and described presstressed reinforcing steel (4) is arch under steel support (3) supports.
2. prestressing force H profile steel supporting and protection structure according to claim 1, is characterized in that, described each soldier pile (1) is provided with three or five or seven steel supports (3).
3. prestressing force H profile steel supporting and protection structure according to claim 1 and 2, is characterized in that, the spacing of the upper adjacent steel bearing (3) of described each soldier pile (1) is 1-3m.
4. prestressing force H profile steel supporting and protection structure according to claim 3, is characterized in that, described in be positioned at the longest steel support (3) on soldier pile (1) length be 0.5-0.9m.
5. prestressing force H profile steel supporting and protection structure according to claim 1, is characterized in that, the surface that described stopping means (5) contacts with presstressed reinforcing steel (4) is arc.
6. prestressing force H profile steel supporting and protection structure according to claim 1, is characterized in that, described steel support (3) is connected with soldier pile (1) by welding.
7. prestressing force H profile steel supporting and protection structure according to claim 1, is characterized in that, the length of described soldier pile (1) is 15m-30m.
8. prestressing force H profile steel supporting and protection structure according to claim 1, is characterized in that, the web of the H profile steel of described soldier pile (1) and steel support (3) is provided with floor of putting more energy into.
9. utilize structure according to any one of claim 1-8 to carry out a construction method for supporting, it is characterized in that, described supporting method comprises the following steps:
Step one, precast prestressed supporting unit: according to the projected depth treating excavation pit, the quantity of the length of selected soldier pile (1) and the upper steel support (3) of each soldier pile (1), the length of soldier pile (1) is 1.4-2.0 times of foundation depth, the upper steel support (3) of each soldier pile (1) is three or five or seven, the spacing of the upper adjacent steel bearing (3) of each soldier pile (1) is 1-3m, selected soldier pile (1) is fixedly connected with steel support (3), one end of presstressed reinforcing steel (4) is anchored in the bottom of soldier pile (1), the other end of presstressed reinforcing steel (4) is successively by the stopping means (5) on all steel supports (3),
Step 2, piling: utilize pile driving equipment that multiple prestressing force supporting unit is squeezed into the surrounding treating excavation pit successively, soldier pile (1) arranges the side of steel support (3) towards foundation ditch center, and the spacing of adjacent soldier pile (1) is 0.8-1.6m;
Step 3, Guan Liang (2) is set: Guan Liang (2) is set on the top of prestressing force supporting unit, is fixed together by all prestressing force supporting unit by Guan Liang (2), make all prestressing force supporting unit and Guan Liang (2) form an entirety;
Step 4, Shi Hanzhang: by prestress application device to presstressed reinforcing steel (4) Shi Hanzhang, ensure that the many presstressed reinforcing steels (4) of each prestressing force supporting unit are subject to identical pulling force, be anchored at presstressed reinforcing steel (4) upper end on Guan Liang (2);
Step 5, excavation of foundation pit: carry out excavation of foundation pit, and progressively improve the prestressing force of presstressed reinforcing steel (4) along with the increase of the excavation of foundation pit degree of depth;
Step 6, carry out Underground Construction;
Step 7, supporting unit reclaim: backfill the earthwork after Underground Construction, the prestressing force of release presstressed reinforcing steel (4), remove braced structures (6), Guan Liang (2) utilize pile pulling device to reclaim prestressing force supporting unit.
10. construction method for supporting according to claim 9, is characterized in that, arranges at least one braced structures (6) after described step 3 completes at Guan Liang (2) towards the side at foundation ditch center.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2023024348A1 (en) * | 2021-08-26 | 2023-03-02 | 中冶建筑研究总院（深圳）有限公司 | Recyclable prestressed support system and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| WO2023024348A1 (en) * | 2021-08-26 | 2023-03-02 | 中冶建筑研究总院（深圳）有限公司 | Recyclable prestressed support system and construction method |
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| CN105256809B (en) | 2017-03-29 |
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