CN104099923A - Cast-in-place externally prestressed concrete-filled steel pipe pile and construction method thereof and support pile wall - Google Patents
Cast-in-place externally prestressed concrete-filled steel pipe pile and construction method thereof and support pile wall Download PDFInfo
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- CN104099923A CN104099923A CN201410276731.9A CN201410276731A CN104099923A CN 104099923 A CN104099923 A CN 104099923A CN 201410276731 A CN201410276731 A CN 201410276731A CN 104099923 A CN104099923 A CN 104099923A
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Abstract
The invention discloses a cast-in-place externally prestressed concrete-filled steel pipe pile, which comprises a steel pipe, a concrete layer cast-in-place in the steel pipe and multiple prestressed tendons arranged on the steel pipe, wherein the prestressed tendons are arranged along the direction of the axis of the steel pipe, and comprise top sections, middle sections and bottom sections; the middle sections are positioned outside the steel pipe; the top sections and the bottom sections penetrate through the wall of the steel pipe and enter into the steel pipe; the upper end of the steel pipe is opened, and the bottom end of the steel pipe is provided with a sealed structure. The invention also provides a construction method of the concrete-filled steel pipe pile and a support pile wall with the concrete-filled steel pipe pile. In the way, the external prestressing technology is adopted by the cast-in-place externally prestressed concrete-filled steel pipe pile, a pile body can be restrained better, the tensile resistance is provided, and deformation of the support pile wall in the excavation process of a foundation pit is effectively limited; in addition, field fabrication can be performed, transport costs are reduced, on the premise of guaranteeing safety and reliability of a foundation pit support, the cost is reduced, the construction period is shortened, and construction is convenient.
Description
Technical field
The present invention relates to all construction projects fields such as building, municipal administration, traffic, water conservancy, electric power, industry, particularly relate to a kind of Cast-in-situs type external prestressing steel tube concrete pile and construction method thereof and supporting piling wall.
Background technology
Base pit engineering technical scheme is mainly considered from aspects such as security reliability, economic rationality, difficulty of construction, construction periods.Many to the application of the stake of SMW engineering method, castinplace pile, diaphragm wall in China coast periphery soft clay area.
Shaped steel Soil-cement Wall, is commonly referred to SMW engineering method, is a kind of compound gear soil waterproof structure that shaped steel forms that inserts in the triaxial cement mixing pile of socket continuously.Utilize three axle agitation pile rigs to cut earth in former stratum, rig leading portion low pressure is injected cement grout simultaneously, fully stir and form the cement earth pile row formula barricade that water-resisting property is higher with the chopping soil body, before cement grout not yet hardens, insert a kind of Construction Technique of Underground Works of shaped steel.The stake of SMW engineering method grows up based on Deep Mixing Pile Construction, and this structure has been given full play to the mechanical characteristic of cement-soil mixture and shaped steel, there is economy, the duration is short, water-resisting property is strong, to features such as surrounding environment influence are little.Shaped steel Soil-cement Wall enclosed structure, after basement construction completes, can be extracted H shaped steel from cement mixing method, reaches the object that reclaims and again utilize.Therefore this engineering method compared with conventional maintenance form not only the duration short, work progress is pollution-free, place clean and tidy clean, noise is little, and can save social resources, avoids safeguarding that body forever leaves in underground after basement construction, becomes underground obstacle.Build a conservation-minded society in promotion, realize today of sustainable development, apply this engineering method and more there is realistic meaning.
But there is following shortcoming in the stake of SMW engineering method: in the stake of SMW engineering method, mostly use H shaped steel, the cost of H shaped steel is high, and in actual construction work use procedure, the freight of shaped steel and lease expenses are all very high, especially, in the situation that the duration is grown, the lease expenses of shaped steel can increase use cost greatly.Shaped steel, generally after basement construction finishes, need to be pulled out in addition, may cause shaped steel bending, break equal loss, in the time that place restriction cannot be extracted, can greatly increase again engineering cost.
The reinforcing bar of castinplace pile and concrete consumption are more, also need to arrange in addition water-stop curtain, construct more loaded down with trivial details, larger on the impact of environment.
Therefore, supporting and protection structure used in existing architecture Foundation Pit Engineering can't meet engineering demand completely, need to develop a kind of novel foundation pit supporting construction, safe and reliable, economical rationality, easy construction.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of Cast-in-situs type external prestressing steel tube concrete pile and construction method and supporting piling wall, simple and reasonable, this Cast-in-situs type external prestressing steel tube concrete pile adopts external prestressing technology, can better retrain pile body, stretching resistance is provided, has effectively limited the distortion of supporting piling wall in Excavation Process; In addition, this Cast-in-situs type external prestressing steel tube concrete pile can be according to designing requirement field fabrication, has avoided pile body spreading and has transported bring unfavorable, save cost of transportation, ensureing, under the safe and reliable prerequisite of pattern foundation pit supporting structure, can to reduce engineering cost, reduction of erection time and easy construction.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of Cast-in-situs type external prestressing steel tube concrete pile is provided, comprise: steel pipe, at the cast-in-place layer of concrete forming of described steel duct be arranged on many presstressed reinforcing steels on described steel pipe, described presstressed reinforcing steel is along the axis direction setting of steel pipe, comprise top section, interlude and end section, described interlude is positioned at steel pipe outside, described top section and end section run through steel pipe tube wall and enter steel pipe inner side, the upper end open of described steel pipe, has an enclosed construction on bottom.
In a preferred embodiment of the present invention, on the wall body of described steel pipe, there is multiple upper through holes and multiple lower through hole, described top section runs through and enters steel duct from upper through hole, and section of the described end runs through and enters steel duct from lower through hole.
In a preferred embodiment of the present invention, described upper through hole is provided with sealing ring with the joint of top section, and the joint of described lower through hole and end section is provided with sealing ring.
In a preferred embodiment of the present invention, the outer wrap of described interlude has a protecting pipe, and the two ends of described protecting pipe are matched with upper through hole, lower through hole respectively.
In a preferred embodiment of the present invention, the distance between described upper through hole and steel pipe upper surface is 2m ~ 4m, and described multiple lower through holes and multiple upper through hole are symmetrical arranged.
In a preferred embodiment of the present invention, described enclosed construction is pyramid enclosed construction.
In a preferred embodiment of the present invention, the cross section entirety of described steel pipe is dumbbell shape, comprise top flange, bottom flange and be arranged on the web between described top flange, bottom flange, in described top flange, be distributed with multiple tops section and end section, in described bottom flange, be distributed with multiple tops section and end section.
The present invention also provides the construction method of above-mentioned Cast-in-situs type external prestressing steel tube concrete pile, comprises following concrete steps:
A, described presstressed reinforcing steel, protecting pipe, sealing ring and steel pipe are assembled, form a steel pipe integral, stand-by;
B, employing cement-soil stirring pile construction machinery are constructed, and form cement mixing method;
C, by Pile feeder, steel pipe integral is put into cement mixing method, extract Pile feeder out;
D, from steel pipe upper end open to its inner concreting, the maintenance of vibrating;
E, when maintenance reaches after design strength, carry out external prestressing and apply.
In a preferred embodiment of the present invention, while steel pipe integral being put into cement mixing method in step c, in cement mixing method, be equipped with high-pressure water pipe device.
The present invention also provides a kind of supporting piling wall with above-mentioned Cast-in-situs type external prestressing steel tube concrete pile, and described supporting piling wall comprises several cement mixing methods and is arranged on the Cast-in-situs type external prestressing steel tube concrete pile in described cement mixing method.
The present invention has following beneficial effect:
1, Cast-in-situs type external prestressing steel tube concrete pile of the present invention adopts external prestressing technology, can better retrain pile body, and stretching resistance is provided, and has effectively limited the distortion of supporting piling wall in Excavation Process;
2, Cast-in-situs type external prestressing steel tube concrete pile of the present invention, can be according to designing requirement, cast in situs in cement mixing method, and pouring construction is convenient, has avoided the trouble of pile body spreading, has reduced cost of transportation;
3, compared with bored pile, Cast-in-situs type external prestressing steel tube concrete pile of the present invention, the reinforcing bar adopting and concrete consumption are few, cost-saving, and little to ambient influnence;
4,, compared with the stake of SMW engineering method, Cast-in-situs type external prestressing steel tube concrete pile of the present invention, with respect to shaped steel, has increased intensity, has reduced cost of transportation, and does not need to pull out, avoided engineering to complete after the loss problem of pulling out of shaped steel;
5, supporting piling wall of the present invention, adopts Cast-in-situs type external prestressing steel tube concrete pile, has good bending rigidity, and supporting intensity is high;
In sum, Cast-in-situs type external prestressing steel tube concrete pile of the present invention and construction method thereof and supporting piling wall, ensure the safe and reliable of foundation pit supporting construction, there is again good economic benefit, easy construction, ambient influnence is little, has further met the demand that base pit engineering is built.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing, wherein:
Fig. 1 is the cross section structure schematic diagram one of described Cast-in-situs type external prestressing steel tube concrete pile;
Fig. 2 is that the A-A of Fig. 1 is to sectional view;
Fig. 3 is the cross section structure schematic diagram two of described Cast-in-situs type external prestressing steel tube concrete pile;
Fig. 4 is the cross section structure schematic diagram three of described Cast-in-situs type external prestressing steel tube concrete pile;
Fig. 5 is the structural representation of a preferred embodiment of supporting piling wall of the present invention;
Fig. 6 is the structural representation of another preferred embodiment of supporting piling wall of the present invention.
Detailed description of the invention
To the technical scheme in the embodiment of the present invention be clearly and completely described below, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making all other embodiment that obtain under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1 to Fig. 6, the embodiment of the present invention comprises:
Embodiment mono-:
Consult Fig. 1, Fig. 2 and Fig. 5, a kind of Cast-in-situs type external prestressing steel tube concrete pile, comprise: steel pipe 1, at the inner cast-in-place layer of concrete forming 2 of described steel pipe 1 be arranged on the many presstressed reinforcing steels 3 on described steel pipe 1, described presstressed reinforcing steel is along the axis direction setting of steel pipe 1, comprise top section 31, interlude 32 and end section 33, described interlude 32 is positioned at steel pipe 1 outside, described top section 31 and end section 33 run through steel pipe tube wall and enter steel pipe inner side, section of the described end 33 puts in layer of concrete 2 inside, be closely linked with layer of concrete 2, described top section 31 parts combine with layer of concrete 2, also have part to expose layer of concrete 2, the part of exposing is used for reaching after design strength at pile body, described presstressed reinforcing steel is carried out to external prestressing to be applied, the present invention adopts external prestressing technology, can better retrain pile body, stretching resistance is provided, effectively limit the distortion of supporting piling wall in Excavation Process.
The upper end open of described steel pipe 1, is used for concreting, has an enclosed construction 4 on bottom.
On the wall body of described steel pipe 1, have multiple upper through holes 11 and multiple lower through hole 12, described top section 31 runs through and enters steel duct from upper through hole 11, and section of the described end 33 runs through and enters steel duct from lower through hole 12.
Described upper through hole 11 is provided with sealing ring (not shown) with the joint of top section 31, makes through hole 11 and the joint of top section 31 have good sealing performance, prevents that outside water from entering steel duct, affects concrete intensity; Equally, described lower through hole 12 is provided with sealing ring with the joint of end section 33, makes lower through hole 12 and the joint of end section 33 have good sealing performance, prevents that outside water from entering steel duct, affects concrete intensity.
In the present embodiment, the cross section entirety of described steel pipe 1 is dumbbell shape, comprise top flange 13, bottom flange 14 and be arranged on described top flange 13, web 15 between bottom flange 14, described top flange 13 and bottom flange 14 ovalizes, described web is rectangle, 13 inside, described top flange have epicoele 133, 14 inside, described bottom flange have cavity of resorption 143, described web inside has intermediate cavity 151, between described top flange 13 and web 15, be formed with upper spacer 131, between described bottom flange and web 15, be formed with lower clapboard 141, on described upper spacer 131, be furnished with along its length multiple upper through holes 132, on described lower clapboard 141, be furnished with along its length multiple lower through-holes 142, described upper through hole 132 and lower through-hole 142 make epicoele 133, the concrete of intermediate cavity 151 and cavity of resorption 143 inside is in conjunction with as a whole, make whole steel tube concrete pile there is preferably structural performance, safe.
On the outside of described top flange 13, be provided with many presstressed reinforcing steels 3, described presstressed reinforcing steel 3 runs through from the outside of top flange 13 and enters epicoele 133 inside, on the outside of described bottom flange 14, be provided with multiple presstressed reinforcing steels, described presstressed reinforcing steel runs through from the outside of bottom flange 14 and enters cavity of resorption 143 inside, in the epicoele 133 of described top flange 13, be distributed with multiple tops section and end section, in the cavity of resorption 143 of described bottom flange 14, be distributed with multiple tops section and end section.
With reference to Fig. 1, described many presstressed reinforcing steels are evenly distributed on steel pipe 1 in the mode of dividing, simple in structure, reasonable in design.
Preferably, the distance between described upper through hole 11 and steel pipe 1 upper surface is 4m, reasonable in design, has ensured the carrying out that external prestressing applies, and described multiple lower through holes 12 are symmetrical arranged with multiple upper through holes 11.
With reference to Fig. 5, the present invention also provides a kind of supporting piling wall with above-mentioned Cast-in-situs type external prestressing steel tube concrete pile, and described supporting piling wall comprises several cement mixing methods and is arranged on the Cast-in-situs type external prestressing steel tube concrete pile in described cement mixing method.
Described cement mixing method adopts triaxial cement mixing pile construction machinery to construct, process the cement mixing method of three mutual interlocks at every turn, be respectively front stake, central pile and rear stake, form a Soil-cement pile element, form body of wall by multiple form of construction work, in described cement mixing method continuously or interval Cast-in-situs type external prestressing steel tube concrete pile is set.
Described supporting piling wall is formed by multiple Soil-cement pile element Heterogeneous Permutations, the rear stake of previous Soil-cement pile element and front interlock mutually of a rear Soil-cement pile element, form alternating expression structure, strengthened overall bending rigidity and Lateral resisting ability.In practice of construction process, undersized Cast-in-situs type external prestressing steel tube concrete pile can be set in independent cement mixing method, in the cement mixing method of the mutual interlock of dislocation place, large-sized Cast-in-situs type external prestressing steel tube concrete pile be set.
Embodiment bis-:
The second embodiment of the present invention and the first embodiment are basic identical; the main distinction is: the interlude outer wrap of described presstressed reinforcing steel has a protecting pipe; the two ends of described protecting pipe are matched with upper through hole, lower through hole respectively; and use sealing ring good seal; in the present embodiment, increased protecting pipe in interlude outside, this protecting pipe can adopt plastic pipe; can protect presstressed reinforcing steel not to be subject to the erosion of outside water, fully ensure high strength and the functional performance of presstressed reinforcing steel.
In addition, also have following difference, in the present embodiment, the distance between described upper through hole and steel pipe upper surface is 2m, reasonable in design, and what ensured that external prestressing applies carries out smoothly, and described multiple lower through holes and multiple upper through hole are symmetrical arranged.
Embodiment tri-:
With reference to Fig. 3 and Fig. 6, the third embodiment of the present invention and the first embodiment are basic identical, the main distinction is: described presstressed reinforcing steel has 2 ~ 6 (shown in Fig. 3 are 6), be divided into two groups, two groups of presstressed reinforcing steels are symmetrical arranged, and every group of 1 ~ 3 presstressed reinforcing steel abuts against together, forms a whole, simple in structure, reasonable in design.
In addition, also have following difference, in the present embodiment, the distance between described upper through hole and steel pipe upper surface is 3m, reasonable in design, and what ensured that external prestressing applies carries out smoothly, and described multiple lower through holes and multiple upper through hole are symmetrical arranged.
In addition, also has following difference, a kind of supporting piling wall with above-mentioned Cast-in-situs type external prestressing steel tube concrete pile is provided in the present embodiment, and described supporting piling wall comprises several cement mixing methods and is arranged on the Cast-in-situs type external prestressing steel tube concrete pile in described cement mixing method.
Described cement mixing method adopts triaxial cement mixing pile construction machinery to construct, process the cement mixing method of three mutual interlocks at every turn, be respectively front stake, central pile and rear stake, form a Soil-cement pile element, form body of wall by multiple form of construction work, in described cement mixing method continuously or interval Cast-in-situs type external prestressing steel tube concrete pile is set.
Described supporting piling wall comprises the cement soil wall matrix being made up of multiple cement mixing methods that are arranged in order mutual interlock, be interval with multiple Soil-cement pile elements that are parallel to described cement soil wall matrix in described cement soil wall matrix one side, the distance at interval can be a cement mixing method or multiple cement mixing method, determine according to the length of actual cement soil wall matrix, three stakes of described Soil-cement pile element respectively with cement soil wall matrix on three mutual interlocks of stake, form raised type structure, in described cement mixing method continuously or be arranged at intervals with Cast-in-situs type external prestressing steel tube concrete pile, overall bending rigidity and Lateral resisting ability are strengthened.In practice of construction process, undersized Cast-in-situs type external prestressing steel tube concrete pile can be set in independent cement mixing method, in the cement mixing method of the mutual interlock at raised type structure place, large-sized Cast-in-situs type external prestressing steel tube concrete pile be set.
Embodiment tetra-:
With reference to Fig. 4, the fourth embodiment of the present invention and the first embodiment are basic identical, and the main distinction is that described top flange and bottom flange change platypelloid type into by original ellipse.
In addition, also have following difference, in the present embodiment, the distance between described upper through hole and steel pipe upper surface is 3m, reasonable in design, and what ensured that external prestressing applies carries out smoothly, and described multiple lower through holes and multiple upper through hole are symmetrical arranged.
The present invention also provides the construction method of above-mentioned Cast-in-situs type external prestressing steel tube concrete pile, comprises following concrete steps:
A, described presstressed reinforcing steel, protecting pipe, sealing ring and steel pipe are assembled, form a steel pipe integral, stand-by;
B, employing cement-soil stirring pile construction machinery are constructed, and form cement mixing method;
C, by Pile feeder, steel pipe integral is put into cement mixing method, extract Pile feeder out, the pyramid enclosed construction of steel pipe bottom, reduce the resistance while sending into, if send into resistance or excessive, in cement mixing method, be equipped with high-pressure water pipe device, be used for dilution water earth, thereby reduce resistance;
D, from steel pipe upper end open to its inner concreting, the maintenance of vibrating;
E, when maintenance reaches after design strength, carry out external prestressing and apply.
The present invention has following beneficial effect:
1, Cast-in-situs type external prestressing steel tube concrete pile of the present invention adopts external prestressing technology, and reasonable stress, can better retrain pile body, and stretching resistance is provided, and has effectively limited the distortion of supporting piling wall in Excavation Process;
2, Cast-in-situs type external prestressing steel tube concrete pile of the present invention, can be according to designing requirement, cast in situs in cement mixing method, and pouring construction is convenient, has avoided the trouble of pile body spreading, has reduced cost of transportation;
3, compared with bored pile, Cast-in-situs type external prestressing steel tube concrete pile of the present invention, the reinforcing bar adopting and concrete consumption are few, cost-saving, and little to ambient influnence.
4,, compared with the stake of SMW engineering method, Cast-in-situs type external prestressing steel tube concrete pile of the present invention, with respect to shaped steel, has increased intensity, has reduced cost of transportation, and does not need to pull out, avoided engineering to complete after the loss problem of pulling out of shaped steel.
5, supporting piling wall of the present invention, adopts Cast-in-situs type external prestressing steel tube concrete pile, has good bending rigidity, and supporting intensity is high.
In sum, Cast-in-situs type external prestressing steel tube concrete pile of the present invention and construction method thereof and supporting piling wall, ensure the safe and reliable of foundation pit supporting construction, there is again good economic benefit, easy construction, ambient influnence is little, has further met the demand that base pit engineering is built.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention to do; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a Cast-in-situs type external prestressing steel tube concrete pile, it is characterized in that, comprise: steel pipe, at the cast-in-place layer of concrete forming of described steel duct be arranged on many presstressed reinforcing steels on described steel pipe, described presstressed reinforcing steel is along the axis direction setting of steel pipe, comprise top section, interlude and end section, described interlude is positioned at steel pipe outside, and described top section and end section run through steel pipe tube wall and enter steel pipe inner side, the upper end open of described steel pipe, has an enclosed construction on bottom.
2. Cast-in-situs type external prestressing steel tube concrete pile according to claim 1, it is characterized in that, on the wall body of described steel pipe, have multiple upper through holes and multiple lower through hole, described top section runs through and enters steel duct from upper through hole, and section of the described end runs through and enters steel duct from lower through hole.
3. Cast-in-situs type external prestressing steel tube concrete pile according to claim 2, is characterized in that, described upper through hole is provided with sealing ring with the joint of top section, and the joint of described lower through hole and end section is provided with sealing ring.
4. Cast-in-situs type external prestressing steel tube concrete pile according to claim 3, is characterized in that, the outer wrap of described interlude has a protecting pipe, and the two ends of described protecting pipe are matched with upper through hole, lower through hole respectively.
5. Cast-in-situs type external prestressing steel tube concrete pile according to claim 2, is characterized in that, the distance between described upper through hole and steel pipe upper surface is 2m ~ 4m, and described multiple lower through holes and multiple upper through hole are symmetrical arranged.
6. Cast-in-situs type external prestressing steel tube concrete pile according to claim 1, is characterized in that, described enclosed construction is pyramid enclosed construction.
7. Cast-in-situs type external prestressing steel tube concrete pile according to claim 1, it is characterized in that, the cross section entirety of described steel pipe is dumbbell shape, comprise top flange, bottom flange and be arranged on the web between described top flange, bottom flange, in described top flange, be distributed with multiple tops section and end section, in described bottom flange, be distributed with multiple tops section and end section.
8. a construction method for Cast-in-situs type external prestressing steel tube concrete pile as claimed in claim 4, is characterized in that, comprises following concrete steps:
A, described presstressed reinforcing steel, protecting pipe, sealing ring and steel pipe are assembled, form a steel pipe integral, stand-by;
B, employing cement-soil stirring pile construction machinery are constructed, and form cement mixing method;
C, by Pile feeder, steel pipe integral is put into cement mixing method, extract Pile feeder out;
D, from steel pipe upper end open to its inner concreting, the maintenance of vibrating;
E, when maintenance reaches after design strength, carry out external prestressing and apply.
9. the construction method of Cast-in-situs type external prestressing steel tube concrete pile according to claim 8, is characterized in that, while steel pipe integral being put into cement mixing method in step c, is equipped with high-pressure water pipe device in cement mixing method.
10. a supporting piling wall, it is characterized in that, described supporting piling wall comprises several cement mixing methods and be arranged on the Cast-in-situs type external prestressing steel tube concrete pile in described cement mixing method, and described Cast-in-situs type external prestressing steel tube concrete pile is the Cast-in-situs type external prestressing steel tube concrete pile described in claim 1 ~ 7 any one.
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| CN201410276731.9A CN104099923B (en) | 2014-06-20 | 2014-06-20 | Cast-type external prestressing steel tube concrete pile and construction method thereof and supporting piling wall |
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| CN113309128A (en) * | 2021-05-24 | 2021-08-27 | 北京建材地质工程有限公司 | Construction method of dumbbell-shaped cement soil curtain pile in peat soil stratum |
| CN113653069A (en) * | 2021-09-09 | 2021-11-16 | 浙江省三建建设集团有限公司 | Pre-tensioning method prestress supporting structure of deep foundation pit and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113309128A (en) * | 2021-05-24 | 2021-08-27 | 北京建材地质工程有限公司 | Construction method of dumbbell-shaped cement soil curtain pile in peat soil stratum |
| CN113653069A (en) * | 2021-09-09 | 2021-11-16 | 浙江省三建建设集团有限公司 | Pre-tensioning method prestress supporting structure of deep foundation pit and construction method thereof |
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| Publication number | Publication date |
|---|---|
| CN104099923B (en) | 2016-08-24 |
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