CN107984610B - A kind of prestressing force small box girder production method - Google Patents
A kind of prestressing force small box girder production method Download PDFInfo
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- CN107984610B CN107984610B CN201711175269.3A CN201711175269A CN107984610B CN 107984610 B CN107984610 B CN 107984610B CN 201711175269 A CN201711175269 A CN 201711175269A CN 107984610 B CN107984610 B CN 107984610B
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- flume
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention discloses a kind of prestressing force small box girder production methods, the prestressing force small box girder is divided into intermediate flume section and positioned at the anchoring section at both ends, flume section is poured first, remain for the flume of arrangement prestress muscle in advance on the web of flume section, and is used for the tensioning hole of tensioned prestressing bar at flume bottom interval a distance default two；By presstressed reinforcing steel lashing in the flume that flume section is reserved, the steel reinforcement cage of the anchoring section of presstressed reinforcing steel and both ends after lashing is fixedly linked, and pour anchoring section positioned at both ends, after anchoring section pours solidification, the tensioning value and stretch value that presstressed reinforcing steel tensioning down, inspection presstressed reinforcing steel reach are met the requirements by two horizontal Zhang Kongyong tensioning equipments of flume bottom；Flume in flume section is poured, third time is completed and pours, tensioning equipment is removed after solidification, completes the production of entire prestressing force small box girder.It is more closely knit that the present invention makes mud jacking in small box girder prestressed stretch-draw, while improving the utilization rate of presstressed reinforcing steel.
Description
Technical field
The present invention relates to bridge construction fields, are related to a kind of small box girder production method, and in particular to a kind of small case of prestressing force
Beam production method.
Background technique
Prefabricated continuous small box girder because its structure is simple, easy construction, it is cheap, save the advantages that duration, in China
With very extensive in Short/Medium Span Bridge.In such precast beam, presstressed reinforcing steel is essential component part.At this stage
More mature method for stretching is post stretching and pre-tensioning system in pre-stress construction.Whether contact according to presstressed reinforcing steel with concrete,
It is divided into bonded prestressed concrete and unbonded prestressed concrete again.Continuous small box girder it is prefabricated in, presstressed reinforcing steel is adopted
With post stretching, adhesive form is to have bonding.But post stretching is used, it occur the problem that (1) is pre- with existing construction technology
Stress rib end stretching force is larger, and the stretching force at span centre position is often smaller；(2) after tension of prestressed tendon, there are duct pressures
Uncompacted situation is starched, the quality of beam is influenced.
Summary of the invention
For existing prestressing force prefabricated small box girder construction technology, it is an object of the invention in order to avoid prior art tensioning
Method bring adverse effect in comprehensive pre-tensioning system and post stretching, externally cable and internal beam, has bonding and prestressing without bondn mixed
Solidifying soil respectively on the basis of advantage, proposes a kind of novel prestressing stretching technique --- transverse tensioning method pre-stress construction.
Another object of the present invention is to provide a kind of structures, and simple, construction safety transverse tensioning method prestressing force small box girder is applied
Work production method.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that:
A kind of prestressing force small box girder production method, it is characterised in that: the prestressing force small box girder is divided into intermediate flume section
With the anchoring section for being located at flume section both ends, entire prestressing force small box girder pours completion in three times, specific as follows:
Step 1: pouring flume section first, remain for arrangement prestress in advance on the prestressing force small box girder web of flume section
The flume of muscle, and in the default two tensioning holes for tensioned prestressing bar of flume bottom interval a distance；
Step 2: by presstressed reinforcing steel lashing in the flume that flume section is reserved, by after lashing presstressed reinforcing steel and both ends
The steel reinforcement cage of anchoring section is fixedly linked, and pours the anchoring section positioned at both ends, and completion pours for the second time；
Step 3: after pouring solidification for the second time, by two horizontal Zhang Kongyong tensioning equipments of flume bottom by presstressed reinforcing steel
Tensioning down, the tensioning value and stretch value that inspection presstressed reinforcing steel reaches are met the requirements；
Step 4: being poured to the flume in flume section, completes third time and pour, tensioning equipment is removed after solidification, it is complete
At the production of entire prestressing force small box girder.
As an improvement, the flume section casting craft are as follows: the bottom plate and web reinforcement for first binding flume section hang steel reinforcement cage
Enter in exterior sheathing, and be packed into the air bag of reserved flume, after air bag inflation reaches requirement air pressure, inner template is installed, binds top plate steel
Muscle, while third time of the reserved hole for flume is set with pipeline every a distance at roof steel bar and pours and installs
Tensioning equipment reserves two tensioning holes for being used for presstressed reinforcing steel transverse stretching at the bottom plate of flume, checks that steel bar template is errorless
Afterwards, first time concrete is poured, flume section is completed and pours.
As an improvement, the positioning steel for positioning presstressed reinforcing steel is being arranged with the anchoring section of flume section joint in step 2
Plate, specifically, multiple corresponding location holes, every prestressing force are arranged on fixing steel plate according to the design requirement of presstressed reinforcing steel
Muscle is passed through from one of location hole, and the steel reinforcement cage of fixing steel plate and anchoring section welds together.
As an improvement, catching on presstressed reinforcing steel in step 2 from spacer bar under back in anchoring section, making to answer in advance in anchoring section
Power muscle keeps straightened condition, and presstressed reinforcing steel binding later pours anchoring section in the steel reinforcement cage of anchoring section, completes the
It is secondary to pour.
As an improvement, being respectively equipped with stiffener net on the bottom plate and web of tensioning hole surrounding in the flume section.
As an improvement, being with the hole spacing that pipeline is reserved in flume section roof steel bar when binding flume section steel reinforcement cage
1.5-3m, the reserved hole of two of them are corresponding with two tensioning holes on bottom plate.
As an improvement, before anchoring section pours, after presstressed reinforcing steel lashing, every the interim positioning of a distance in flume
Reinforced bar support presstressed reinforcing steel, anchoring section remove interim spacer bar after pouring solidification.
As an improvement, presstressed reinforcing steel is divided into tilting section and flat segments in flume after to presstressed reinforcing steel transverse stretching, wherein
The Bottom Runby of presstressed reinforcing steel transverse stretching and the ratio range of inclination segment length are 1:4.5~1:6.
As an improvement, the concrete that third time pours flume is than preceding two-step pouring flume section and anchoring section concrete strength
The microdilatancy pea gravel concreten of a high grade.
As an improvement, the tensioning equipment includes tension rod, bearing plate, anchorage and jack, first by the top of tension rod with
Bearing plate is fixedly linked, then that tension rod is past at the top of flume to transfer, tension rod at least two, and is symmetrically distributed in prestressing force
Muscle two sides, tension rod lower end are stretched out from the tensioning hole of flume bottom, place steel plate washer between bearing plate and presstressed reinforcing steel later,
Tension rod bottom is installed with jack, wedge-shaped bearing plate, wedge-shaped bearing plate are set between jack and flume section bottom plate
Upper surface is parallel with flume section bottom plate, and lower surface is vertical with tension rod, finally starts jack pair presstressed reinforcing steel and laterally open
It draws, after reaching requirement to tension of prestressed tendon, pours flume, flume removes jack and wedge-shaped bearing plate after pouring solidification, will
The tension rod stretched out outside bottom plate is cut off, and closes tensioning hole.
The beneficial effects of the present invention are:
(1) greatest drawback of post-tensioned construction is that leakiness phenomenon easily occurs in pipeline pneumatic mortar, to influence the quality of beam.
Therefore it is reserved flume casting concrete that transverse tensioning method, which changes pipeline pneumatic mortar, so that the quality of beam is controlled better.
(2) post stretching is used, that there are stretching forces when presstressed reinforcing steel is longer is uneven, middle part presstressed reinforcing steel utilization rate is low asks
Topic, and transverse tensioning method tensioning is used, presstressed reinforcing steel still has preferable stretch-draw effect in the middle part of girder span, the experiment proved that, presstressed reinforcing steel
Utilization rate can be up to 80%~90%.
(3) post stretching needs anchorage that presstressed reinforcing steel is fixed, and transverse tensioning method has used for reference the bonding of pre-tensioning system from anchor, saves
Anchorage is saved；Meanwhile stretching force needed for transverse tensioning method is much smaller than the stretching force of post stretching, can select the very heavy of smaller tonnage
Top；Transverse tensioning method saves certain from box beam tension in lower part, both ends prestressing tendon without stretching out beam body to obtain tension operation space
The presstressed reinforcing steel of quantity.
(3) present invention solves the problems, such as that mud jacking is uncompacted in existing small box girder prestressed stretch-draw, while reducing pre- answer
The stress loss of power muscle, significantly reduces stretching force at the utilization rate for improving presstressed reinforcing steel.The configuration of the present invention is simple, construction
Safety is mainly used for carrying out the prestressing force small box girder construction of prestressed stretch-draw in beam bottom.
Detailed description of the invention
Fig. 1 is prestressing force small box girder top view.
Fig. 2 is prestressing force small box girder sectional view in Fig. 1；
Wherein A-A is anchoring section sectional view in Fig. 1, and B-B is flume section sectional view in Fig. 1.
Fig. 3 is prestressing force small box girder presstressed reinforcing steel lashing and tensioning schematic diagram.
Fig. 4 is prestressing force small box girder flume section stiffener net distribution schematic diagram.
Fig. 5 is that tensioning equipment uses schematic diagram.
Fig. 6 is left half section of the small case of prestressing force upper preformed hole setting top view illustration.
Fig. 7 is left half section of the small case of prestressing force upper tensioning hole setting bottom view schematic diagram.
1- flume section, 2- anchoring section, 3- presstressed reinforcing steel, 4- flume section top plate, 5- flume section web, 6- flume section bottom plate,
7- anchoring section top plate, 8- anchoring section bottom plate, 9- anchoring section web, 10- fixing steel plate, 11- web stiffener net, 12- bottom plate
Stiffener net, 13- flume, 14- tensioning hole, 15- hole, 16-P anchor extruded sleeve, 17- bearing plate, 18- steel plate washer, 19- tensioning
Bar, 20- wedge shape bearing plate, 21- anchorage, 22- jack, 23- anchoring section stiffener.
Specific embodiment
Below by non-limiting embodiment, the invention will be further described:
A kind of prestressing force small box girder production method, as shown in Figure 1, the prestressing force small box girder to be divided into intermediate flume section 1
With the anchoring section 2 for being located at 1 both ends of flume section, entire prestressing force small box girder pours completion in three times, specific as follows:
Step 1: pouring flume section 1 first, remains for arrangement in advance on the prestressing force small box girder web of flume section 1 and answer in advance
The flume 13 of power muscle 3, and in the default two tensioning holes 14 for tensioned prestressing bar 3 of 13 bottom interval a distance of flume；
Step 2: by the lashing in the flume 13 that flume section 1 is reserved of presstressed reinforcing steel 3, by the presstressed reinforcing steel 3 and two after lashing
The steel reinforcement cage of the anchoring section 2 at end is fixedly linked, and pours the anchoring section 2 positioned at both ends, and completion pours for the second time；
Step 3: after pouring solidification for the second time, by two horizontal Zhang Kongyong tensioning equipments of 13 bottom of flume by prestressing force
The tensioning down of muscle 3, the tensioning value and stretch value that inspection presstressed reinforcing steel 3 reaches are met the requirements；
Step 4: being poured to the flume 13 in flume section 1, completes third time and pours, tensioning equipment is removed after solidification,
Complete the production of entire prestressing force small box girder.
1 casting craft of flume section are as follows: steel reinforcement cage is hung in external mold by the bottom plate and web reinforcement for first binding flume section 1
In plate, and it is packed into the air bag of reserved flume 13, after air bag inflation reaches requirement air pressure, inner template is installed, binds roof steel bar, together
When at roof steel bar every one section of 2m distance with PVC pipeline be arranged third time of the reserved hole 15 for flume 13 pour and
Tensioning equipment is installed, two tensioning holes 14 for being used for 3 transverse stretching of presstressed reinforcing steel are reserved at the bottom plate of flume 13, check reinforcing bar
After template is errorless, first time concrete is poured, flume section 1 is completed and pours, after pouring, air bag, which is deflated, to take out forms flume
13。
In step 2, the fixing steel plate 10 for positioning presstressed reinforcing steel 3, tool are being set with the anchoring section 2 of 1 joint of flume section
Body is, according to the design requirement of presstressed reinforcing steel 3, multiple corresponding location holes, every presstressed reinforcing steel 3 to be arranged on fixing steel plate 10
It is passed through from one of location hole, to guarantee 3 accurate positioning of presstressed reinforcing steel, the web reinforcement of fixing steel plate 10 and anchoring section 2
Cage welds together or is held together, and fixing steel plate 10 meets rule with a thickness of 30mm or so, the pitch requirements of adjacent presstressed reinforcing steel 3
Model requirement.
In step 2, presstressed reinforcing steel 3 is caught on from spacer bar under back in anchoring section 2, makes presstressed reinforcing steel 3 in anchoring section 2
Straightened condition is kept, and the binding of presstressed reinforcing steel 3 later pours anchoring section 2 in the steel reinforcement cage of anchoring section 2, completes the
It is secondary to pour.
Bottom plate stiffener net 12 and web are respectively equipped in the flume section 1 on the bottom plate and web of 14 surrounding of tensioning hole
Stiffener net 11, there is not crack in bottom plate and web concrete surface when guaranteeing 3 transverse stretching of presstressed reinforcing steel.
Bind 1 steel reinforcement cage of flume section when, on 4 reinforcing bar of flume section top plate with pipeline reserve 15 spacing of hole be 1.5-
3m, the present embodiment 2m, the reserved hole 15 of two of them are corresponding with two tensioning holes 14 on bottom plate.
Before anchoring section 2 pours, after 3 lashing of presstressed reinforcing steel, every the interim spacer bar branch of 4m distance in flume 13
Presstressed reinforcing steel 3 is supportted, meets the required linear position of design to ensure presstressed reinforcing steel 3 before tensioning, after anchoring section 2 pours solidification
Interim spacer bar is removed, 3 both ends of presstressed reinforcing steel are tied up on 9 steel reinforcement cage of anchoring section web.
After 3 transverse stretching of presstressed reinforcing steel, presstressed reinforcing steel 3 is divided into tilting section and flat segments in flume 13, wherein answering in advance
The Bottom Runby of 3 transverse stretching of power muscle and the ratio range of inclination segment length are 1:4.5~1:6.
The concrete that third time pours flume 13 is higher by one than preceding two-step pouring flume section 1 and 2 concrete strength of anchoring section
The microdilatancy pea gravel concreten of a grade.
The tensioning equipment that above-mentioned transverse tensioning method prestressing force small box girder production method uses includes tension rod 19, bearing plate 17, anchor
19 top of tension rod is first fixedly linked with bearing plate 17 by P anchor extruded sleeve 16, then by tension rod by tool 21 and jack 22
19 from 13 top of flume toward decentralization, tension rod 19 at least two, and is symmetrically distributed in 3 two sides of presstressed reinforcing steel, 19 lower end of tension rod
It is stretched out from the tensioning hole 14 of 13 bottom of flume, steel plate washer 18 is placed between bearing plate 17 and presstressed reinforcing steel 3 later, by tension rod
19 bottoms are installed with jack 22, and wedge-shaped bearing plate 20, wedge-shaped bearing plate are arranged between jack 22 and flume section bottom plate 6
20 upper surfaces are parallel with flume section bottom plate 6, and lower surface is vertical with tension rod 19, finally start jack 22 to presstressed reinforcing steel 3 into
Row transverse stretching after reaching requirement to 3 tensioning of presstressed reinforcing steel, pours flume 13, and flume 13 removes jack 22 after pouring solidification
With wedge-shaped bearing plate 20, the tension rod 19 stretched out outside flume section bottom plate 6 is cut off, and closes tensioning hole 14.
2 length of anchoring section to meet presstressed reinforcing steel 3 cohere anchor needed for minimum length requirement, specific size according to
Beam body construction determines that 1 length of flume section is that beam length subtracts the residue length after beam both ends anchoring section 2.Box girder construction completes front and back
Real-time monitoring is carried out to construction quality.The other parts of the present embodiment use the prior art.
Claims (6)
1. a kind of prestressing force small box girder production method, it is characterised in that: by the prestressing force small box girder be divided into intermediate flume section and
Anchoring section positioned at flume section both ends, entire prestressing force small box girder pours completion in three times, specific as follows:
Step 1: pouring flume section first, remain for arrangement prestress muscle in advance on the prestressing force small box girder web of flume section
Flume, and in the default two tensioning holes for tensioned prestressing bar of flume bottom interval a distance；
Step 2: by presstressed reinforcing steel lashing in the flume that flume section is reserved, by the anchoring of presstressed reinforcing steel and both ends after lashing
The steel reinforcement cage of section is fixedly linked, and pours the anchoring section positioned at both ends, and completion pours for the second time；
Step 3: after pouring solidification for the second time, by two horizontal Zhang Kongyong tensioning equipments of flume bottom by presstressed reinforcing steel down
Tensioning, the tensioning value and stretch value that inspection presstressed reinforcing steel reaches are met the requirements；
Step 4: being poured to the flume in flume section, completes third time and pour, tensioning equipment is removed after solidification, complete whole
The production of a prestressing force small box girder；
The flume section casting craft are as follows: the bottom plate and web reinforcement for first binding flume section hang in steel reinforcement cage in exterior sheathing, and
It is packed into the air bag of reserved flume and inner template is installed after air bag inflation reaches requirement air pressure, bind roof steel bar, while in top plate
Third time of the reserved hole for flume is set with pipeline every a distance at reinforcing bar and pours and install tensioning equipment, bright
Two tensioning holes for being used for presstressed reinforcing steel transverse stretching are reserved at the bottom plate of slot, after checking that steel bar template is errorless, are poured for the first time
Concrete is completed flume section and is poured；
In step 2, the fixing steel plate for positioning presstressed reinforcing steel is being set with the anchoring section of flume section joint, specifically, according to
The design requirement of presstressed reinforcing steel, is arranged multiple corresponding location holes on fixing steel plate, and every presstressed reinforcing steel is fixed from one of them
Position passes through in hole, and the steel reinforcement cage of fixing steel plate and anchoring section welds together；
In step 2, presstressed reinforcing steel is caught on from spacer bar under back in anchoring section, presstressed reinforcing steel in anchoring section is made to keep straight
State, and presstressed reinforcing steel binding later pours anchoring section in the steel reinforcement cage of anchoring section, completion pours for the second time；
Before anchoring section pours, after presstressed reinforcing steel lashing, answered in advance every a distance with interim positioning steel-bar supporting in flume
Power muscle, anchoring section remove interim spacer bar after pouring solidification.
2. a kind of prestressing force small box girder production method as described in claim 1, it is characterised in that: tensioning hole in the flume section
Stiffener net is respectively equipped on the bottom plate and web of surrounding.
3. a kind of prestressing force small box girder production method as described in claim 1, it is characterised in that: binding flume section steel reinforcement cage
When, it with the hole spacing that pipeline is reserved is 1.5-3m in flume section roof steel bar, on two of them reserved hole and bottom plate
Two tensioning holes it is corresponding.
4. a kind of prestressing force small box girder production method as described in claim 1, it is characterised in that: to presstressed reinforcing steel transverse stretching
Afterwards, presstressed reinforcing steel is divided into tilting section and flat segments in flume, wherein the Bottom Runby and tilting section of presstressed reinforcing steel transverse stretching
The ratio range of length is 1:4.5~1:6.
5. a kind of prestressing force small box girder production method as described in claim 1, it is characterised in that: pour the mixed of flume for the third time
Solidifying soil is the microdilatancy pea gravel concreten of a grade higher than preceding two-step pouring flume section and anchoring section concrete strength.
6. a kind of prestressing force small box girder production method as described in claim 1 to 5 any one, it is characterised in that: described
Drawing equipment includes tension rod, bearing plate, anchorage and jack, will first be fixedly linked at the top of tension rod with bearing plate, then will open
Pull rod toward decentralization, tension rod at least two, and is symmetrically distributed in presstressed reinforcing steel two sides at the top of the flume, and tension rod lower end is from flume
The tensioning hole of bottom is stretched out, and places steel plate washer between bearing plate and presstressed reinforcing steel later, and tension rod bottom and jack are pacified
It installing, wedge-shaped bearing plate is set between jack and flume section bottom plate, wedge-shaped bearing plate upper surface is parallel with flume section bottom plate,
Lower surface is vertical with tension rod, finally starts jack pair presstressed reinforcing steel and carries out transverse stretching, reaches to tension of prestressed tendon and want
After asking, flume is poured, flume removes jack and wedge-shaped bearing plate after pouring solidification, the tension rod stretched out outside bottom plate is cut off,
And close tensioning hole.
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| CN106592839A (en) * | 2017-03-03 | 2017-04-26 | 沈阳建筑大学 | Horizontal tensioning and external pre-stressing profiled steel sheet composite floor |
| CN109695322A (en) * | 2019-02-01 | 2019-04-30 | 蔡君 | Prestressed prefabricated stringer type stairway of one kind and preparation method thereof |
| CN111622079A (en) * | 2020-05-26 | 2020-09-04 | 中交路桥建设有限公司 | Separated construction method for prestressed cast-in-situ box beam end and beam |
| CN112695633A (en) * | 2020-12-17 | 2021-04-23 | 中国能源建设集团安徽电力建设第一工程有限公司 | Prefabricated small box girder prestress engineering construction method for intelligent express way |
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| CN1061121C (en) * | 1995-09-08 | 2001-01-24 | 周志祥 | Method for construction of transverse tension prestress concrete beam |
| CN2350429Y (en) * | 1998-11-08 | 1999-11-24 | 周志祥 | Transverse tension prestress hollow concrete slab bridge |
| CN102182146B (en) * | 2011-03-29 | 2012-07-04 | 中国铁道科学研究院铁道建筑研究所 | Prestress rib tensioning equipment, system and method and concrete continuous box girder |
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