CN101775772B - Sloping tensioning method two-way prestressed concrete pavement construction method - Google Patents
Sloping tensioning method two-way prestressed concrete pavement construction method Download PDFInfo
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- CN101775772B CN101775772B CN2010101041424A CN201010104142A CN101775772B CN 101775772 B CN101775772 B CN 101775772B CN 2010101041424 A CN2010101041424 A CN 2010101041424A CN 201010104142 A CN201010104142 A CN 201010104142A CN 101775772 B CN101775772 B CN 101775772B
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Abstract
The invention discloses a sloping tensioning method two-way prestressed concrete pavement construction method, which comprises the concrete construction steps of construction preparation, slide layer construction, mold standing, U-shaped template placement, constructional steel bar placement, fixed end extruding anchor device installation, prestressed bar distribution, concrete casting, maintenance, tensioning end anchor device installation and prestressed bar tensioning. The sloping tensioning method two-way prestressed concrete pavement construction method has the advantages of convenient construction and high construction speed. After the construction on roads, the road surfaces have the characteristics of strong bearing force, good deformation resistance capability, no crack seam on the road surfaces, few joint seams and comfortable vehicle driving. The construction method is applied to the construction processes of airfield pavement and various grades of public road surfaces, toll stations, parking places and the like.
Description
Technical field
The present invention relates to a kind of novel oblique method for two-way pre-stressed cement concrete pavement, the oblique method for two-way pre-stressed technology of utilization that is specially adapted to few seam cement concrete pavement improves cement concrete pavement stress performance pavement construction method;
Background technology
Cement concrete pavement has advantageous advantage, rigid pavement intensity height, good stability, long service life, but there is a large amount of shrinkage joint in the road surface, cause often taking place to squeeze broken, arch upward, diseases such as faulting of slab ends, purt mud, simultaneously, a large amount of shrinkage joint also can increase road rumble, the comfortableness of influence driving.
The prestressed concrete pavement has the bearing capacity height, non-deformability is strong, characteristics such as pavement durability height, road-ability are good, and nineteen forties possesses some special knowledge abroad and develops.Use the earliest is in France, and Britain and other European countries successively used it on pavement of road or the airfield pavement afterwards.Countries such as the U.S., Japan and the former Soviet Union have also all built the prestressing force cement concrete pavement and the airfield runway of some.But these road surfaces all are vertical arrangement prestress reinforcing bars, have long construction period, defective such as construction complexity etc., longitudinal prestressing apply the lotus ability of vertically holding that has improved the road surface greatly, but the horizontal bending tensile strength of concrete road faceplate panels is worked hardly.
Summary of the invention
The object of the present invention is to provide that a kind of bearing capacity is strong, non-deformability good, free from flaw, easy construction, the road surface has longitudinal prestressing, and transverse prestress is arranged again, and seam is few, the comfortable a kind of sloping tensioning method two-way prestressed concrete pavement construction method of driving a vehicle.
In order to overcome the deficiencies in the prior art, technical scheme of the present invention is to solve like this: utilize oblique method for two-way pre-stressed technology to improve the pavement construction method of rigid pavement stress performance, undertaken by following step:
(1) preparation of construction
1) should be confided a technological secret to unit in charge of construction by designing unit before the prestressed concrete pavement panel construction, design document, drawing, data should be complete;
2) before the construction of prestressed concrete pavement panel, the workmanship of seal should meet the pertinent regulations of national current standard " highway subgrade construction technique normalizing " JTG F10-2006 and " highway road surface construction technique normalizing " JTJ 034-2000 under its roadbed, bed course, basic unit reached;
3) should be during materials arrival by the examination of marching into the arena of the regulation of related specifications; Before the panel construction of prestressed concrete pavement, should check reserves, the performance of material requested, guarantee the quality and quantity of all material;
(2) sliding layer construction
Sliding layer is arranged on basic unit's end face, and basic unit should smooth nothing cheat recessed; Sliding layer is evenly to lay the thick layer of sand of 1～2cm on basic unit's aspect, wherein the sand grains diameter is less than 0.3mm, and play leveling and the frictional resistance effect of less basic unit at layer of sand upper berth layer of polyethylene film, the lap-joint of polyethylene sheeting is bonded into whole to prevent to seep water and fine sand lost with adhesive tape;
(3) formwork erection
Template adopts punching block, and template bottom surface and basic unit's end face are close to, and local low-lying place is paved with cement mortar in the space in advance, and template installs the back and checks whether the discrepancy in elevation and the template inboard of joint have dislocation, and the discrepancy in elevation of joint is controlled in the 3mm;
(4) put U pattern plate
The position of U pattern plate is wanted strict and is put by construction drawing, can not have than large deviation, if U pattern board placing malposition, to cause on the same horizontal plane steel strand position not parallel, can cause discontinuity after the stretch-draw, the thickness of U pattern plate should be not less than 3mm, and the size of U pattern plate calculates by portion of stretch-draw end office (EO) pressurized, and the height of U pattern plate is consistent with road surface thickness;
(5) structure of arranging reinforcing bar
Distributing bar is divided into longitudinal structure reinforcing bar, a transverse structure reinforcing bar and another transverse structure reinforcing bar and U type distributing bar, and the longitudinal structure reinforcing bar adopts the indented bars of diameter 10～14mm; Transverse structure reinforcing bar and the plain bar that adopts diameter 6～8mm, a transverse structure reinforcing bar are positioned at place, U pattern plate position, and another transverse structure reinforcing bar is the position between U pattern plate; U type distributing bar adopts the plain bar of diameter 6～8mm; The longitudinal structure reinforcing bar arranges vertically that along the road surface two-layer layout is divided in adjacent U pattern plate inboard, and two every layer, behind the longitudinal structure reinforcing bar location, in the longitudinal structure reinforcing bar, arrange along U pattern plate inner edge by U type distributing bar with the colligation of thin wire quadrature for the transverse structure reinforcing bar; The position that the road slab end does not have oblique presstressed reinforcing steel is the steel mesh reinforcement reinforcement of 25cm * 25cm with spacing; Distributing bar divides two-layer laying, when laying distributing bar, the lower floor position is followed successively by U type distributing bar, a transverse structure reinforcing bar or another transverse structure reinforcing bar, longitudinal structure reinforcing bar from top to bottom, and the position, upper strata is followed successively by longitudinal structure reinforcing bar, a transverse structure reinforcing bar or another transverse structure reinforcing bar, U type distributing bar from top to bottom;
(6) arrangement prestress muscle
Presstressed reinforcing steel adopts the un-bonded prestressed steel strand of diameter 12.7mm or 15.2mm, vertically become predetermined angular with the road surface, this angle is determined according to the road slab Aspect Ratio, the sheath of steel strand should be complete, the local damage place should adopt adhesive waterproof tape to twine closely, presstressed reinforcing steel is laid should be straight, and its curvilinear coordinate height tolerance is no more than setting, and the steel strand end will guarantee vertical with U pattern plate;
(7) ground tackle is installed
The fixed end ground tackle adopts squash type, stretch-draw end ground tackle adopts clip type, the Extruding spring of extruding anchor will be filled in the anchor ring, fill in length and be at least 2/3rds of anchor ring length, it is firm that the anchor tackle bearing plate of pressed end and U pattern plate will contact, must not leave the slit, and vertical with U pattern plate, stretch-draw end anchor plate should be perpendicular to presstressed reinforcing steel;
(8) concreting
Finish because Surface of Trial Pavement requires total length once to pave, during concreting, vibration compacting is wanted in the attention both sides, to prevent that when vibrated concrete U pattern plate from moving, and forbid operating worker arbitrarily to trample presstressed reinforcing steel, in order to avoid the presstressed reinforcing steel design attitude is inaccurate, and can not adopt pumping concrete construction;
(9) health
After construction of concrete face slab finished, to reduce to occur the possibility of early-age shrinkage cracking, covering straw bag needed uniform sprinkling every day with straw bag covering the carrying out maintenance of soaking, keep straw bag to be in dampness, through 12 days～16 days curing time, after the expiration, can remove overburden;
(10) steel strand tension
In order to guarantee that the concrete road faceplate panels does not shrink cracking before applying prestressing force, presstressed reinforcing steel is stretch-draw at twice, jack is adopted in prestressed stretch-draw, for guaranteeing the accuracy of prestress value, the employing precision is 0.4 grade accurate oil pressure gauge control, carries out the supporting verification of jack and oil pressure gauge before the stretch-draw first time, offers testing crew stretching force accurately, the tension sequence of prestress wire is undertaken by the working drawing requirement, and control stress for prestressing is σ
Con=1860 * 75%=1395MPa;
1) stretch-draw is for the first time carried out second day of concreting, adopts the stretch-draw of one-sided interval, and its control stress for prestressing value is 0.3 σ
Con=418.5MPa;
2) stretch-draw for the second time requires to carry out when concrete reaches 75% design strength, and actual is to build on the road surface one week of back, adopts super stretch-draw during stretch-draw, and tension stress is 1.05 σ
Con, hold lotus 2min, off-load is to σ again
ConBack anchoring;
If adopt the single width construction, all carry out stretch-draw in curb one side, fixed end adopts the extruding anchor, direct concreting, and after the stretch-draw end treats that two times tensioning finishes, the teeming concrete;
If adopt the full width construction, then can adopt in the stretch-draw of both sides, road surface.
The present invention compared with prior art tiltedly opens the two-way two-way prestressed concrete pavement of method and compares with common prestressed concrete pavement, has the following advantages:
(1), tiltedly the method for two-way pre-stressed rigid pavement is to consider to construct and the road structure of setting continuously, both can produce longitudinal prestressing, can produce transverse prestress again; Two-way road pavement is carried out prestressing force, is more suitable for the force-bearing situation on road surface than the prestressing force of single direction;
(2), the tiltedly setting of method for two-way pre-stressed rigid pavement presstressed reinforcing steel: presstressed reinforcing steel divides two-layer layout, and the first floor presstressed reinforcing steel is arranged on apart from 0～2cm place, road surface thickness center, and the adjacent first floor presstressed reinforcing steel of second layer presstressed reinforcing steel top is arranged;
(3), the diameter of presstressed reinforcing steel can adopt 12.7mm or 15.2mm un-bonded prestressed steel strand;
(4), tiltedly the stretch-draw of the presstressed reinforcing steel of method for two-way pre-stressed rigid pavement can be carried out in the both sides, road surface, has improved construction speed with this, control stress for prestressing adopts accurate oil pump control;
(5), the vertical angular range that forms in presstressed reinforcing steel and road surface is 0～45 degree.
Description of drawings
Fig. 1 is a U pattern plated construction schematic diagram of the present invention;
Fig. 2 passes the positional structure schematic diagram for lower floor's steel strand;
Fig. 3 passes the positional structure schematic diagram for the upper strata steel strand;
Fig. 4 is a distributing bar arrangement schematic diagram;
Fig. 5 is that plate end distributing bar is arranged schematic diagram;
Fig. 6 is a prestressed concrete pavement cross-sectional configuration schematic diagram;
Fig. 7 arranges schematic diagram for test road presstressed reinforcing steel;
Fig. 8 is that the levels presstressed reinforcing steel is in test trackside face schematic diagram;
The accompanying drawing mark: 1 is ground tackle; 2 is presstressed reinforcing steel; 3 is U pattern plate; 4 pass the position for lower floor's presstressed reinforcing steel; 5 is U pattern plate flank center line; 6 pass the position for the upper strata presstressed reinforcing steel; 7 is the transverse structure reinforcing bar at U pattern plate place; 8 is the transverse structure reinforcing bar between U pattern plate; 9 is the longitudinal structure reinforcing bar; 10 is U type distributing bar; 11 is the end structure reinforcing bar; 12 is the road surface longitudinal joint; 13 is the prestressed concrete pavement; 14 is 1～2cm layer of sand+polyethylene sheeting; 15 is sub-surface; 16 is the road surface thickness center line; 17 is the upper strata presstressed reinforcing steel; 18 is lower floor's presstressed reinforcing steel.
The specific embodiment
Below in conjunction with accompanying drawing summary of the invention is described further:
Utilize oblique method for two-way pre-stressed to improve the pavement construction method of concrete tensile strength, undertaken by following step:
Construction technology
With reference to Fig. 1～shown in Figure 8:
(1) preparation of construction
1) should be confided a technological secret to unit in charge of construction by designing unit before the prestressed concrete pavement panel construction, design document, drawing, data should be complete;
2) before the construction of prestressed concrete pavement panel, the workmanship of seal should meet the pertinent regulations of national current standard " highway subgrade construction technique normalizing " JTG F10-2006 and " highway road surface construction technique normalizing " JTJ 034-2000 under its roadbed, bed course, basic unit reached;
3) should be during materials arrival by the examination of marching into the arena of the regulation of related specifications; Before the panel construction of prestressed concrete pavement, should check reserves, the performance of material requested, guarantee the quality and quantity of all material.
(2) sliding layer construction
Shown in Figure 6, sliding layer is arranged on basic unit's 15 end faces, and basic unit should smooth nothing cheat recessed.Sliding layer 14 is evenly to lay the thick layer of sand of 1～2cm in basic unit, wherein the sand grains diameter is less than 0.3mm, and play leveling and reduce the frictional resistance effect at layer of sand upper berth layer of polyethylene film, the lap-joint of polyethylene sheeting is bonded into whole preventing to seep water and the scattering and disappearing of fine sand with adhesive tape, 13 be an oblique method prestressed concrete pavement panel.
(3) formwork erection
As shown in Figure 1, U pattern plate 3 adopts punching block, and template bottom surface and basic unit's end face are close to, and local low-lying place is paved with cement mortar in the space in advance, U pattern plate installs the back and checks whether the discrepancy in elevation and the template inboard of joint have dislocation, and the discrepancy in elevation of joint is controlled in the 3mm.
(4) put the U template
The position of U template is wanted strict and is put by construction drawing, can not have than large deviation, if U pattern board placing malposition, to cause on the same horizontal plane steel strand position not parallel, can cause discontinuity after the stretch-draw, the thickness of U pattern plate should be not less than 3mm, and the size of U pattern plate calculates by portion of stretch-draw end office (EO) pressurized, and the height of U pattern plate is consistent with road surface thickness.
(5) structure of arranging reinforcing bar
Shown in Fig. 4,5, distributing bar is divided into longitudinal structure reinforcing bar 9, a transverse structure reinforcing bar 7 and another transverse structure reinforcing bar 8 and U type distributing bar 10, and longitudinal structure reinforcing bar 9 adopts the indented bars of diameter 10～14mm; Transverse structure reinforcing bar 7 and 8 adopts the plain bar of diameter 6～8mm, and a transverse structure reinforcing bar 7 is positioned at place, U pattern plate position, and another transverse structure reinforcing bar 8 is the position between U pattern plate; U type distributing bar 10 adopts the plain bar of diameter 6～8mm; The longitudinal structure reinforcing bar arranges vertically that along the road surface two-layer layout is divided in adjacent U pattern plate inboard, and two every layer, behind the longitudinal structure reinforcing bar location, in the longitudinal structure reinforcing bar, arrange along U pattern plate inner edge by U type distributing bar with the colligation of thin wire quadrature for the transverse structure reinforcing bar; The position that the road slab end does not have oblique presstressed reinforcing steel is steel mesh reinforcement 11 reinforcements of 25cm * 25cm with spacing; Distributing bar divides two-layer laying, when laying distributing bar, the lower floor position is followed successively by U type distributing bar 10, a transverse structure reinforcing bar 7 or another transverse structure reinforcing bar 8, longitudinal structure reinforcing bar 9 from top to bottom, and the position, upper strata is followed successively by longitudinal structure reinforcing bar 9, a transverse structure reinforcing bar 7 or another transverse structure reinforcing bar 8, U type distributing bar 10 from top to bottom.
(6) arrange steel strand
Shown in Fig. 1,2,3,7,8, oblique presstressed reinforcing steel adopts the un-bonded prestressed steel strand of diameter 12.7mm or 15.2mm, vertically become predetermined angular with the road surface, this angle is determined according to concrete road faceplate panels aspect ratio, the outsourcing of steel strand should be complete, described un-bonded prestressed steel strand outsourcing material adopts high density polyethylene pipe, and prestress wire is free body in polyethylene pipe; If there is breakage prestress wire outsourcing part, should adopt adhesive waterproof tape to twine closely.Unbonded prestressing tendon is laid should be straight, and its curvilinear coordinate height tolerance should be no more than setting, and the steel strand end will guarantee vertical with the U template; Presstressed reinforcing steel 2 passes U pattern plate flank, and lower floor's presstressed reinforcing steel 18 passes the position that the position is U pattern plate flank center line 5 bottoms 4, and upper strata presstressed reinforcing steel 17 passes the position that the position is U pattern plate 3 flank center lines 5 tops 6; Pass position ground tackle 1 anchoring presstressed reinforcing steel 2.Upper strata steel strand 17 are referred to as prestress wire 2 with lower floor's steel strand 18, and side schematic view 8 can more intuitively obtain steel strand and pass particular location.
(7) ground tackle is installed
The fixed end ground tackle adopts squash type, stretch-draw end ground tackle adopts clip type, the Extruding spring of extruding anchor will be filled in the anchor ring, fill in length and be at least 2/3rds of anchor ring length, it is firm that the anchor tackle bearing plate of pressed end and U pattern plate will contact, must not leave the slit, and vertical with U pattern plate, stretch-draw end anchor plate should be perpendicular to presstressed reinforcing steel;
(8) concreting
Requiring an oblique method prestressed concrete pavement (about 100m) once to pave finishes, during concreting, vibration compacting is wanted in the attention both sides, to prevent that when vibrated concrete template from moving, and forbid operating worker arbitrarily to trample presstressed reinforcing steel, in order to avoid the presstressed reinforcing steel design attitude is inaccurate, and can not adopt pumping concrete construction;
(9) health
After construction of concrete face slab finished, to reduce to occur the possibility of early-age shrinkage cracking, covering straw bag needed uniform sprinkling every day with straw bag covering the carrying out maintenance of soaking, keep straw bag to be in dampness, through 12 days～16 days curing time, after the expiration, can remove overburden;
(10) steel strand tension
In order to guarantee that the concrete long slab does not shrink cracking before applying prestressing force, presstressed reinforcing steel is stretch-draw at twice, jack is adopted in prestressed stretch-draw, for guaranteeing the accuracy of prestress value, the employing precision is 0.4 grade accurate oil pressure gauge control, carries out the supporting verification of jack and oil pressure gauge before the stretch-draw first time, offers testing crew stretching force accurately, the tension sequence of prestress wire is undertaken by the working drawing requirement, and control stress for prestressing is σ
Con=1860 * 75%=1395MPa;
1) stretch-draw is for the first time carried out second day of concreting, adopts the stretch-draw of one-sided interval, and its control stress for prestressing value is 0.3 σ
Con=418.5MPa;
2) stretch-draw for the second time requires to carry out when concrete reaches 75% design strength, and actual is to build on the road surface one week of back, adopts super stretch-draw during stretch-draw, and tension stress is 1.05 σ
Con, hold lotus 2min, off-load is to σ again
ConBack anchoring;
If adopt the single width construction, all carry out stretch-draw in curb one side, fixed end adopts the extruding anchor, direct concreting, and after the stretch-draw end treats that two times tensioning finishes, the teeming concrete;
If adopt the full width construction, then can adopt in the stretch-draw of both sides, road surface.
Claims (1)
1. sloping tensioning method two-way prestressed concrete pavement construction method, undertaken by following step:
(1) preparation of construction
1) should be confided a technological secret to unit in charge of construction by designing unit before the prestressed concrete pavement panel construction, design document, drawing, data should be complete;
2) before the construction of prestressed concrete pavement panel, the workmanship of seal should meet the pertinent regulations of national current standard " highway subgrade construction technique normalizing " JTG F10-2006 and " highway road surface construction technique normalizing " JTJ 034-2000 under its roadbed, bed course, basic unit reached;
3) should be during materials arrival by the examination of marching into the arena of the regulation of related specifications; Before the panel construction of prestressed concrete pavement, should check reserves, the performance of material requested, guarantee the quality and quantity of all material;
(2) sliding layer construction
Sliding layer is arranged on basic unit's end face, and basic unit should smooth nothing cheat recessed; Sliding layer is evenly to lay the thick layer of sand of 1～2cm on basic unit's aspect, wherein the sand grains diameter is less than 0.3mm, and play leveling and reduce basic unit's frictional resistance effect at layer of sand upper berth layer of polyethylene film, the lap-joint of polyethylene sheeting is bonded into whole to prevent to seep water and the scattering and disappearing of fine sand with adhesive tape;
(3) formwork erection
Template adopts punching block, and template bottom surface and basic unit's end face are close to, and local low-lying place is paved with cement mortar in the space in advance, and template installs the back and checks whether the discrepancy in elevation and the template inboard of joint have dislocation, and the discrepancy in elevation of joint is controlled in the 3mm;
(4) put U pattern plate
The position of U pattern plate is wanted strict and is put by construction drawing, can not have than large deviation, if U pattern board placing malposition, to cause on the same horizontal plane steel strand position not parallel, can cause discontinuity after the stretch-draw, the thickness of U pattern plate should be not less than 3mm, and the size of U pattern plate calculates by portion of stretch-draw end office (EO) pressurized, and the height of U pattern plate is consistent with road surface thickness;
(5) structure of arranging reinforcing bar
Distributing bar is divided into longitudinal structure reinforcing bar (9), a transverse structure reinforcing bar (7) and another transverse structure reinforcing bar (8) and U type distributing bar (10), and longitudinal structure reinforcing bar (9) adopts the indented bars of diameter 10～14mm; Transverse structure reinforcing bar (7,8) adopts the plain bar of diameter 6～8mm, and a transverse structure reinforcing bar (7) is positioned at place, U pattern plate position, another transverse structure reinforcing bar (8) position between U pattern plate; U type distributing bar (10) adopts the plain bar of diameter 6～8mm; Longitudinal structure reinforcing bar (9) arranges vertically that along the road surface two-layer layout is divided in adjacent U pattern plate inboard, two every layer, behind longitudinal structure reinforcing bar (9) location, in longitudinal structure reinforcing bar (9), arrange along U pattern plate inner edge by U type distributing bar (10) with the colligation of thin wire quadrature for the transverse structure reinforcing bar; The position that the road slab end does not have oblique presstressed reinforcing steel is the steel mesh reinforcement reinforcement of 25cm * 25cm with spacing; Distributing bar divides two-layer laying, when laying distributing bar, the lower floor position is followed successively by U type distributing bar (10), a transverse structure reinforcing bar (7) or another transverse structure reinforcing bar (8), longitudinal structure reinforcing bar (9) from top to bottom, and the position, upper strata is followed successively by longitudinal structure reinforcing bar (9), a transverse structure reinforcing bar (7) or another transverse structure reinforcing bar (8), U type distributing bar (10) from top to bottom;
(6) arrangement prestress muscle
Presstressed reinforcing steel adopts the un-bonded prestressed steel strand of diameter 12.7mm or 15.2mm, vertically become predetermined angular with the road surface, this angle is determined according to the road slab Aspect Ratio, the sheath of steel strand should be complete, the local damage place should adopt adhesive waterproof tape to twine closely, presstressed reinforcing steel is laid should be straight, and its curvilinear coordinate height tolerance is no more than setting, and the steel strand end will guarantee vertical with U pattern plate;
(7) ground tackle is installed
The fixed end ground tackle adopts squash type, stretch-draw end ground tackle adopts clip type, the Extruding spring of extruding anchor will be filled in the anchor ring, fill in length and be at least 2/3rds of anchor ring length, it is firm that the ground tackle of fixed end (1) backing plate and U pattern plate (3) will contact, must not leave the slit, and vertical with U pattern plate (3), stretch-draw end anchor plate should be perpendicular to presstressed reinforcing steel;
(8) concreting
Finish because Surface of Trial Pavement requires total length once to pave, during concreting, vibration compacting is wanted in the attention both sides, to prevent that when vibrated concrete U pattern plate from moving, and forbid operating worker arbitrarily to trample presstressed reinforcing steel, in order to avoid the presstressed reinforcing steel design attitude is inaccurate, and can not adopt pumping concrete construction;
(9) health
After construction of concrete face slab finished, to reduce to occur the possibility of early-age shrinkage cracking, covering straw bag needed uniform sprinkling every day with straw bag covering the carrying out maintenance of soaking, keep straw bag to be in dampness, through 12 days～16 days curing time, after the expiration, can remove overburden;
(10) steel strand tension
In order to guarantee that the concrete road faceplate panels does not shrink cracking before applying prestressing force, presstressed reinforcing steel is stretch-draw at twice, jack is adopted in prestressed stretch-draw, for guaranteeing the accuracy of prestress value, the employing precision is 0.4 grade accurate oil pressure gauge control, carries out the supporting verification of jack and oil pressure gauge before the stretch-draw first time, offers testing crew stretching force accurately, the tension sequence of prestress wire is undertaken by the working drawing requirement, and control stress for prestressing is σ
Con=1860 * 75%=1395MPa;
1) stretch-draw is for the first time carried out second day of concreting, adopts the stretch-draw of one-sided interval, and its control stress for prestressing value is 0.3 σ
Con=418.5MPa;
2) stretch-draw for the second time requires to carry out when concrete reaches 75% design strength, and actual is to build on the road surface one week of back, adopts super stretch-draw during stretch-draw, and tension stress is 1.05 σ
Con, hold lotus 2min, off-load is to σ again
ConBack anchoring;
If adopt the single width construction, all carry out stretch-draw in curb one side, fixed end adopts the extruding anchor, direct concreting, and after the stretch-draw end treats that two times tensioning finishes, the teeming concrete;
If adopt the full width construction, then can adopt in the stretch-draw of both sides, road surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101041424A CN101775772B (en) | 2010-02-01 | 2010-02-01 | Sloping tensioning method two-way prestressed concrete pavement construction method |
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|---|---|---|---|
| CN2010101041424A CN101775772B (en) | 2010-02-01 | 2010-02-01 | Sloping tensioning method two-way prestressed concrete pavement construction method |
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| CN101775772B true CN101775772B (en) | 2011-08-03 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101985823A (en) * | 2010-10-26 | 2011-03-16 | 交通运输部公路科学研究所 | Sliding continuous reinforced concrete pavement, composite pavement and construction method thereof |
| CN102587224A (en) * | 2012-03-12 | 2012-07-18 | 中铁十九局集团有限公司 | Foundation structure of ground structure and method for constructing railway roadbed by using foundation structure |
| CN103194949B (en) * | 2013-04-03 | 2015-05-20 | 西安公路研究院 | Structure and method for repairing cracks of oblique prestressed cement concrete pavement |
| CN103628376B (en) * | 2013-11-20 | 2016-05-18 | 长安大学 | Bumping at bridge-head control structure and laying method thereof based on concrete composite road surface |
| CN105239484A (en) * | 2015-09-24 | 2016-01-13 | 沈阳建筑大学 | Road surface structure suitable for heavy-duty traffic |
| CN105862538B (en) * | 2016-05-31 | 2018-05-15 | 沈阳建筑大学 | The oblique bond-retarded prestressed concrete pavement structure of assembled |
| CN107447616A (en) * | 2017-09-01 | 2017-12-08 | 西安汉河环保科技有限公司 | A kind of oblique prestressed concrete modularization construction process |
| CN109183783B (en) * | 2018-10-24 | 2023-10-24 | 南宁职业技术学院 | Breaking-free separated pile head of concrete filling pile |
| CN109881553A (en) * | 2019-02-26 | 2019-06-14 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | A kind of precast prestressed RPC concrete pavement slab structure and construction method |
| CN109881552A (en) * | 2019-02-26 | 2019-06-14 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | A kind of prefabricated post stressed concrete pavement slab structure of pin-connected panel and method |
| CN114250661B (en) * | 2021-12-17 | 2023-08-15 | 绍兴市城投再生资源有限公司 | Prestressed reinforced stable fine-grained soil base layer and construction method and device thereof |
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