CN101694098B - Recyclable prestressed tendon for soft oil support and construction method thereof - Google Patents
Recyclable prestressed tendon for soft oil support and construction method thereof Download PDFInfo
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- CN101694098B CN101694098B CN200910197095XA CN200910197095A CN101694098B CN 101694098 B CN101694098 B CN 101694098B CN 200910197095X A CN200910197095X A CN 200910197095XA CN 200910197095 A CN200910197095 A CN 200910197095A CN 101694098 B CN101694098 B CN 101694098B
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Abstract
The invention discloses a recyclable prestressed tendon for soft oil support and a construction method thereof. The prestressed tendon comprises: an anchor plate, a steel strand, an anchor end lock and loaded plates, wherein the anchor plate is circular and one side of the plate is provided with a plurality of loaded plate and strand holes evenly along the periphery, and the circle center of the plate is provided with a grouting hole; the anchor end lock is tubular and fixedly arranged on the strand hole at one side of the anchor plate; the loaded plate takes the shape of a vane and is movably connected with the anchor by a hinge; two sides of the hinge are provided with a limit plate fixedly connected with the anchor plate; and the steel strand penetrates into the strand hole to be compressed and connected with the anchor end lock fixedly arranged on the anchor plate. The construction method includes the following steps: digging a base pit and forming pores; arranging the tendon; locking the tendon; and recovering the steel strand. The prestressed tendon and the method are simple in structure and convenient for construction and compared with the prior art, have the advantages of no support structure in the base pit, convenience for digging soil body, no problems that underground barriers appear and building construction crosses the building line, the recyclable tendon for support, fast progress of works and high work efficiency.
Description
Technical field
The present invention relates to the bracing of foundation pit technical field of building structure, especially a kind of be suitable for cutting depth at 10m with interior recyclable prestressed tendon for soft oil support and job practices thereof.
Background technology
At present, excavation of foundation pit generally all adopts the job practices of tiltedly drawing anchor or support to combine with space enclosing structure, as adopt that steel supports, the space enclosing structure of concrete support and campshed, the stake of SMW worker's method, this job practices construction costs height, and have the space enclosing structure of support to influence excavation of foundation pit, soil excavation is very inconvenient, and in foundation ditch, being provided with stand column pile, after supporting finished, support and stand column pile need be removed, engineering quantity is big, and structure construction is produced adverse influence.In soft oil support, prior art adopts is that what tiltedly to draw anchor to substitute to support all is expendable anchor cable or soil-nail wall support, this supporting method all will surmount the red line of planning basically, be that area such as Shanghai existing local regulation institute is unallowed, thereby be difficult to basically adopt, and anchor cable can not reclaim and cause the wasting of resources, forms underground obstacle.
Summary of the invention
A kind of recyclable prestressed tendon for soft oil support and the job practices thereof that provide at the deficiencies in the prior art is provided, it is unbraced structure, supporting flexibility height in foundation ditch, reinforcement at random, the anchor cable cost is low, and recyclable utilization, can separate the problem that has decided red line, do not produce underground obstacle, have soil excavation conveniently, programming is fast, the advantage of high efficiency, real is a kind of resources conservation, environmentally friendly job practices.
The object of the present invention is achieved like this: a kind of recyclable prestressed tendon for soft oil support, be characterized in comprising: anchor plate, steel strand, anchor end lock, bearing plate, anchor plate is circular, and the one side is all established several bearing plates, twisted wire hole along circumference, and the center of circle is provided with grout hole; Anchor end lock is installed on the twisted wire hole of anchor plate one side for tubulose; Bearing plate is that the paddle shape is flexibly connected by hinge and anchor plate; The hinge both sides are provided with the limiting plate affixed with anchor plate; Steel strand penetrate twisted wire hole and the anchor end lock crimping that is installed on the anchor plate.
Described limiting plate is a wedge shaped baffle, is arranged on the hinge both sides and limits bearing plate and be horn-like with 15～40 ° and open.
Described anchor end lock is provided with crimping length by the stretching force of anchor cable.
A kind of job practices of recyclable prestressed tendon for soft oil support is characterized in that this method comprises: excavation of foundation pit and pore-forming, placement anchor cable, anchor cable locking, recovery steel strand, and concrete construction is undertaken by following step:
A, excavation of foundation pit and pore-forming
The bracing of foundation pit stake is set, purlin and supporting anchorage cable are enclosed in the excavation of foundation pit setting then, anchor cable is provided with and adopts high-pressure rotary-spray wet type pile, the stake footpath is about Φ 500mm, the inclination of drilling rod is 25～35 °, angular deviation＜1 °, the discrepancy in elevation＜5cm, depth of pore forming is greater than the design length 0.5m of anchor cable, stake end hole enlargement＞Φ 800mm;
B, placement anchor cable
In the pile hole, place anchor cable, during placement on the steel strand every interval 1.5m a location tensioner ring be set make anchoring section be fusiformis, at the bottom of anchor cable was positioned over, steel strand were then drawn from enclose the purlin circular hole;
C, anchor cable locking
Behind the pile 3～7 hours, anchor cable is carried out first stretch-draw, and stretch-draw length is 70～100mm, bearing plate is opened fully be 15～40 ° horn-like, pile intensity is carried out formal stretch-draw to anchor cable after reaching designing requirement, and anchorage cable stretching locks and sealing off and covering anchorage after reaching designing requirement;
D, layering are provided with anchor cable
The foundation ditch stage excavation carries out layering by above-mentioned a～c step anchor cable is set;
E, recovery steel strand
During the foundation ditch back-filling in layers, and layering recovery steel strand, when the crimp force that the pulling force of steel strand is locked greater than the anchor end, steel strand just break away from anchor end lock, and are reusable after pull comes out from anchor cable.
The present invention compared with prior art has simple in structure, and unbraced structure in the foundation ditch makes things convenient for soil excavation, can not produce the problem that underground obstacle and building operations go out red line, and the recyclable utilization of the anchor cable of supporting, and programming is fast, the advantage of high efficiency.
Description of drawings
Accompanying drawing 1 is the structural representation of anchor cable of the present invention
Accompanying drawing 2 is accompanying drawing 1 left view
Accompanying drawing 3 is the anchor plate structural representation
Accompanying drawing 4 is the invention process illustration
Accompanying drawing 5 is structural representation behind the anchorage cable stretching of the present invention
Accompanying drawing 6 is placed schematic diagram for the location tensioner ring
The specific embodiment
Be that 8.5 meters base pit engineering is an example with C building, No. 2 plot of long wind, Shanghai cutting depth below, the present invention is further elaborated:
(1) location
Soil excavation is to-3.000 meters, and measure absolute altitude, backguy is marked on fender post 11, rig is in place, and accurately base is leveled up, 30 ° at the angle of inclination of drilling rod adopts compass to check, angular deviation is not more than 1 degree, the discrepancy in elevation is no more than 5cm.
(2) pile
Adopt the wet type pile, construction rotary jet stirring cement-soil, in distance stake 3 meters scopes at the end, repeat spray and stir hole enlargement, hole enlargement at the bottom of guaranteeing is not less than Φ 800mm, depth of pore forming is than long 0.5 meter of design projected depth, and water/binder ratio 0.75: 1, pump pressure are 20Mpa, cement consumption is every meter 75kg, and 28 days unconfined compression strength design loads of cement-soil q
u〉=1.5MPa.
(3) the anchor cable system is done
(4) the anchor cable body lays
Length by designing requirement, anchor plate 1, steel strand 2, anchor end lock 3, bearing plate 6 are delivered to design attitude+300mm, 3 meters length hole enlargement positions at the i.e. stake end, steel strand 2 are with the concrete capping beam or enclose in the circular hole of purlin 10 and draw, steel strand 2 adopt the method construction of steel strand cover pvc pipe with the concrete capping beam or enclose purlin 10 adapter sections.
Behind pile 3～7 hours, anchor cable is carried out first stretch-draw, stretch-draw length is 70～100mm, guarantees that bearing plate 6 is horn-like with 37.5 ° and opens.
(5) stretch-draw, locking
The formal stretch-draw of anchor cable, locking must be laid and a stake hole strength carries out after reaching designing requirement at anchor cable, and billet is 30cm * 30cm * 2cm, adopts QM ground tackle, YC-100 type core-theaded type jack, electric oil pump loading locking.Undertaken locking after the stretch-draw by designing requirement, in locking process, adopt the anchor cable tensiometer to check.
(6) sealing off and covering anchorage
After anchorage cable stretching, locking are finished, adopt typing anchoring product to carry out sealing off and covering anchorage.
(7) layering is provided with anchor cable
The foundation ditch stage excavation carries out layering by above-mentioned (1)～(6) step anchor cable is set.
(8) reclaim steel strand
During the foundation ditch back-filling in layers, and layering recovery steel strand 2, the greatest limit crimp forces that anchor end lock 3 is set are 200KN; The working pulling force of anchor cable is 100KN, during recovery, when the pulling force＞200KN of steel strand 2 can break away from anchor end lock 3, reuses after steel strand 2 just can pull out from anchor cable and reclaim.
Claims (4)
1. recyclable prestressed tendon for soft oil support is characterized in that comprising: anchor plate, steel strand, anchor end lock, bearing plate, and anchor plate be a circle, and the one side is all established several bearing plates, twisted wire hole along circumference, and the center of circle is provided with grout hole; Anchor end lock is installed on the twisted wire hole of anchor plate one side for tubulose; Bearing plate is that the paddle shape is flexibly connected by hinge and anchor plate; The hinge both sides are provided with the limiting plate affixed with anchor plate; Steel strand penetrate twisted wire hole and the anchor end lock crimping that is installed on the anchor plate.
2. according to the described recyclable prestressed tendon for soft oil support of claim 1, it is characterized in that described limiting plate is a wedge shaped baffle, be arranged on the hinge both sides and limit bearing plate and be horn-like with 15～40 ° and open.
3. according to the described recyclable prestressed tendon for soft oil support of claim 1, it is characterized in that the stretching force setting crimping length of described anchor end lock by anchor cable.
4. the job practices of the described recyclable prestressed tendon for soft oil support of claim 1 is characterized in that this method comprises: excavation of foundation pit and pore-forming, placement anchor cable, anchor cable locking, reclaim steel strand, concrete construction is undertaken by following step:
A, excavation of foundation pit and pore-forming
The bracing of foundation pit stake is set, purlin and supporting anchorage cable are enclosed in the excavation of foundation pit setting then, anchor cable is provided with and adopts high-pressure rotary-spray wet type pile, the stake footpath is about Ф 500mm, the inclination of drilling rod is 25～35 °, angular deviation＜1 °, the discrepancy in elevation＜5cm, depth of pore forming is greater than the design length 0.5m of anchor cable, stake end hole enlargement＞Ф 800mm;
B, placement anchor cable
Place anchor cable in the pile hole, every interval 1.5m is provided with a location tensioner ring and makes anchoring section be fusiformis on the steel strand of anchor cable, and at the bottom of anchor cable was positioned over, steel strand were then drawn from enclose the purlin circular hole;
C, anchor cable locking
Behind the pile 3～7 hours, anchor cable is carried out first stretch-draw, stretch-draw length is 70～100mm, bearing plate is opened fully be 15～40 ° horn-like, after stake intensity reaches designing requirement anchor cable is carried out formal stretch-draw, stretch-draw reaches locking and sealing off and covering anchorage after the designing requirement;
D, layering are provided with anchor cable
The foundation ditch stage excavation carries out layering by above-mentioned a～c step anchor cable is set;
E, recovery steel strand
During the foundation ditch back-filling in layers, and layering recovery steel strand, when the crimp force that the pulling force of steel strand is locked greater than the anchor end, steel strand just break away from anchor end lock, and are recyclable after pull comes out from anchor cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910197095XA CN101694098B (en) | 2009-10-13 | 2009-10-13 | Recyclable prestressed tendon for soft oil support and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910197095XA CN101694098B (en) | 2009-10-13 | 2009-10-13 | Recyclable prestressed tendon for soft oil support and construction method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101694098A CN101694098A (en) | 2010-04-14 |
| CN101694098B true CN101694098B (en) | 2011-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910197095XA Active CN101694098B (en) | 2009-10-13 | 2009-10-13 | Recyclable prestressed tendon for soft oil support and construction method thereof |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104457655B (en) * | 2014-11-27 | 2017-07-07 | 同济大学 | A kind of folding blade blade multipoint displacement meter anchor head for soft soil layer |
| CN105155552B (en) * | 2015-09-08 | 2016-11-30 | 中国建筑股份有限公司 | The retracting device of foundation ditch interim cable bolting steel strand wires and recovery method |
| CN108018858A (en) * | 2017-12-14 | 2018-05-11 | 上海智平基础工程有限公司 | A kind of detachable prestressed anchor cable anchorage |
| CN109778854A (en) * | 2019-03-21 | 2019-05-21 | 重庆交通大学 | A kind of arrow anchor for soil body anchoring |
| CN109914406B (en) * | 2019-04-08 | 2024-02-13 | 重庆大学 | Novel anti-slip bearing pile capable of recycling vertical anchor prepressing |
| CN110424387B (en) * | 2019-08-22 | 2021-05-28 | 辽宁工程技术大学 | Prestressed anchor cable with anchoring end reinforced connection and cable body self-locking function |
| CN111535314A (en) * | 2020-06-03 | 2020-08-14 | 江苏东合南岩土科技股份有限公司 | Recyclable anchor rod and construction method thereof |
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| CN101694098A (en) | 2010-04-14 |
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