CN109338950A - A kind of anticollision barrier construction method for highway - Google Patents
A kind of anticollision barrier construction method for highway Download PDFInfo
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- CN109338950A CN109338950A CN201811339010.2A CN201811339010A CN109338950A CN 109338950 A CN109338950 A CN 109338950A CN 201811339010 A CN201811339010 A CN 201811339010A CN 109338950 A CN109338950 A CN 109338950A
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- Prior art keywords
- steel
- hole
- profile steel
- presstressed reinforcing
- concrete
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
- E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
- E01F15/0453—Rails of materials other than metal or concrete, e.g. wood, plastics; Rails of different materials, e.g. rubber-faced metal profiles, concrete-filled steel tubes
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
- E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
- E01F15/0476—Foundations
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
- E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
- E01F15/0484—Installing; Repairing; Adjusting
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
The invention discloses a kind of anticollision barrier construction methods for highway, specifically comprise the following steps: step 1, excavation pit, 6~12m embedded hole is bored vertically downward in foundation pit bottom center, the embedded hole is used for pre- buried end anchor and presstressed reinforcing steel, pre-buried H profile steel and blinding concrete is poured in foundation pit simultaneously, embedded hole is located at the underface at H profile steel center；Step 2, in H profile steel centre-drilling hole, prestressed muscle；Step 3, slip casting in the hole bored to step 2；Step 4, guardrail steel construction is installed above H profile steel；Step 5, rectangular steel tube, and the casting concrete into rectangular steel tube are installed above the guardrail steel construction that step 4 is installed；Step 6, tensioning, sealing off and covering anchorage are carried out to presstressed reinforcing steel.The anticollision barrier intensity of this method production is higher, will not be deformed according to the variation of temperature, thus the phenomenon that reducing contraction and creep.
Description
Technical field
The invention belongs to highway crash equipment technical fields, are related to a kind of anticollision barrier construction method for highway.
Background technique
Currently, gradually increasing with city automobile ownership, the traffic accident occurred therewith on highway is also more and more,
Therefore, in order to reduce causality loss to greatest extent, present highway both sides can all be arranged protective fence, but existing guardrail structure
Intensity is poor, and the bending deformation often pressed after by vehicle collision causes damages to vehicle larger, and with
The variation of temperature, Tai Re or too cold, guardrail can be deformed with hot weather or cold snap；Therefore, it is necessary to design one kind
Impact resistance and the high anticollision barrier of intensity.
Summary of the invention
The object of the present invention is to provide a kind of anticollision barrier construction method for highway, the anticollision barriers of this method production
Intensity is higher, will not be deformed according to the variation of temperature, thus the phenomenon that reducing contraction and creep.
The technical scheme adopted by the invention is that a kind of anticollision barrier construction method for highway, specifically includes as follows
Step:
Step 1, excavation pit bores 6~12m embedded hole in foundation pit bottom center position vertically downward, which is used for
Pre- buried end anchor and presstressed reinforcing steel, while pre-buried H profile steel and blinding concrete is poured in foundation pit, above-mentioned embedded hole is located at H profile steel
The underface at center；
Step 2, in H profile steel centre-drilling hole, presstressed reinforcing steel is passed down through from hole-drilled center；
Step 3, slip casting in the hole bored to step 2；
Step 4, guardrail steel construction is installed above H profile steel；
Step 5, rectangular steel tube is installed above the guardrail steel construction that step 4 is installed, and pours coagulation into rectangular steel tube
Soil；
Step 6, tensioning, sealing off and covering anchorage are carried out to presstressed reinforcing steel.
The features of the present invention also characterized in that
Detailed process is as follows for step 1:
Step 1.1, cloth hole is carried out on construction ground, and the pitch-row between adjacent holes is 2~3 meters, is checked simultaneously after cloth hole
Telltale mark is carried out, foundation trench excavation is then carried out in the hole location of label, after being excavated to substrate elevation, foundation trench hole surrounding is carried out
Strike off processing；
Step 1.2,6~12m embedded hole 10 is bored vertically downward at 7 bottom center of foundation pit slot dug；
Step 1.3, the lateral pre-buried H profile steel in the foundation trench hole dug, and welding spiral shell is respectively perpendicular at the both ends of H profile steel
Bolt reserves drilling position at H profile steel center, then pours foundation trench hole inner cushion layer concrete, pours height as foundation trench bottom surface to H-type
The half of steel height.
Detailed process is as follows for step 2:
Step 2.1, it using drilling machine, drilling in the drilling position that H profile steel center is reserved, aperture is 10~15cm,
Drilling depth is identical as the horizontal plate thickness of H profile steel plate, i.e., hole is saturating by H profile steel twist drill；
Step 2.2, bottom anchor is covered in presstressed reinforcing steel bottom, presstressed reinforcing steel is inserted into vertically downward from the hole that H profile steel is drilled,
Until bottom anchor is contacted with the bottom surface of embedded hole.
Detailed process is as follows for step 3: in the hole being drilled to H profile steel center using slip casting machine pressure pump by pneumatic hose
Slip casting is carried out, until slurries reach concordant with the following height of H profile steel centre bore.
Slip casting slurry in step 3 is prepared using following steps:
Step A, weighing
By cement, sand, rubber powder, new material, water and water-reducing agent with 1:1:0.05:0.08:0.07~0.1:0.5:0.01
Ratio weigh, wherein new material is the mixture of swelling agent and Hua Qiansu, and the mixed proportion of swelling agent and Hua Qiansu are
7:3；
Step B, stirring
Load weighted cement, sand, rubber powder and new material are sequentially added in cement mortar mixer and are stirred, low speed
After stirring 20~40s, water and water-reducing agent 20~40s of high-speed stirred is added, stops mixing 80~100s, by blade and is stirred with rubber scraping
The glue mixed on machine inner wall is scraped in blender, and 50~70s of stirring is further continued for；Step C enters mould, makes test specimen
The material that step 2 is stirred is divided two layers and is fitted into die trial, with a metal ruler along die trial top plane, from die trial top
One end, moved with setting up a separatist regime by force of arms movement to the other end on die trial top along die trial length direction, the placing direction of metal scale and die trial are long
It is vertical to spend direction, disposably scrapes off glue sand extra in die trial, and smoothed out surface of test piece with metal ruler；
Step D, maintenance
After test specimen completes, die trial is marked, band die trial is put into maintenance in fog room, until providing demoulding time
20~demould for 24 hours, test specimen is put into fog room until regulation age after demoulding.
Detailed process is as follows for step 4: guardrail steel construction is horizontally arranged to the top of H profile steel, the two of guardrail steel construction
Across the both ends of H profile steel, nut, which is screwed on bolt, is fixed together guardrail steel construction with H profile steel at end, and to guardrail steel construction
Interior casting concrete is cheated with foundation trench, until the upper surface being poured into foundation trench is cheated is concordant.
The detailed process of step 5 are as follows: the casting concrete into rectangular steel tube, and pour to away from rectangular steel tube nozzle downward 10
At~15cm, and vibrate and keep overall structure more closely knit.
Detailed process is as follows for step 6:
Backing plate with centre bore is covered in the upper end of presstressed reinforcing steel, then intermediate plate anchorage is coaxially socketed in presstressed reinforcing steel
Upper end；Backing plate is vertically arranged with presstressed reinforcing steel, guarantees uniform force when tensioning；The specific tensioning of presstressed reinforcing steel is divided to following two
Stage:
First stage: after the completion of rectangular steel tube inner concrete pours for 24 hours after, when rectangular steel tube inner concrete intensity is big
When being equal to the 30% of design strength, tension tool is connect with intermediate plate anchorage, tensioning, tension stress value are carried out to presstressed reinforcing steel
For 0.3~0.5 σ con；
Second stage: after rectangular steel tube inner concrete pours 5~7d of completion, and concrete strength reaches design strength
When 75%, tensioning uses ultra stretching, and tension stress is 1.05~1.15 σ con, holds 2~3min of lotus, then after being offloaded to σ con, cut
Except too long presstressed reinforcing steel, the length exposed outside anchor clipper after cutting off presstressed reinforcing steel cannot be less than 30mm, and buckle is caught in
At the upper port of rectangular steel tube, and sealing off and covering anchorage is carried out with high-strength cement mortar.
The invention has the advantages that anticollision barrier construction method provided by the invention, by digging foundation trench at the construction field (site)
Hole, the pre-buried H profile steel in foundation trench is cheated, and poured by concrete and slurry, in the top of H profile steel, protective fence steel knot is set
Structure, and fixed by concreting, it is equipped with rectangular steel tube in the top of protective fence steel construction, rectangular steel tube is coaxially socketed in pre-
Outside stress rib, and the casting concrete into rectangular steel tube；Rectangular steel tube and presstressed reinforcing steel and guardrail steel construction is set to be solidified as one
Body；Rectangular steel tube stretches out outside foundation trench hole, plays the role of anticollision barrier, due to the architectural characteristic of rectangular steel tube itself, makes this hair
Anticollision barrier intensity in bright is higher, further, since the slurry that rectangular steel tube pours, the interior slurry includes swelling agent and Hua Qiansu
Mixture, which can prevent concrete shrinkage, pre- crack resistence, increase pulp strength, so that the guardrail in of the invention
Intensity is higher, will not be deformed according to the variation of temperature, thus the phenomenon that reducing contraction and creep.
Detailed description of the invention
Fig. 1 is the structural plan of anticollision barrier in a kind of anticollision barrier construction method for highway of the present invention.
In figure, 1.H fashioned iron, 2. bolts, 3. concrete, 4. presstressed reinforcing steels, 5. bottom anchors, 6. guardrail steel constructions, 7. nuts, 8.
Rectangular steel tube, 9. buckles, 10. embedded holes.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
A kind of anticollision barrier construction method for highway of the present invention, anticollision guardrail structure distribution is as shown in Figure 1, specific packet
It includes following steps: preparing related equipment, material, equipment and march into the arena, construction part is reconnoitred, is designed most preferably by surveys
Arrangement and method for construction.By design requirement, then selected location determines that foundation trench excavates range by design drawing, is accurately excavated.
Step 1, excavation pit bores 6~12m embedded hole 10 in foundation pit bottom center, the embedded hole 10 vertically downward
Pre-buried H profile steel and blinding concrete is poured for pre- buried end anchor and presstressed reinforcing steel, while in foundation pit, embedded hole 10 is located at H-type
The underface at steel center；
Detailed process is as follows for step 1:
Step 1.1, cloth hole is carried out on construction ground, and the pitch-row between adjacent holes is 2~3 meters, is checked simultaneously after cloth hole
Carry out telltale mark, then in the hole location of label carry out foundation trench excavation, after being excavated to substrate elevation, to foundation trench cheat 7 surroundings into
Row strikes off processing；
Pitch-row error should not be greater than 3cm, and in digging process, foundation trench mainly uses hand excavation, and size is generally 60cm
× 60 × 60cm all around carries out foundation pit manually to strike off processing, substrate should meet design after being excavated to design substrate elevation
It is required that；
Step 1.2,6~12m embedded hole 10 is bored vertically downward at 7 bottom center of foundation pit slot dug；
Step 1.3, the lateral pre-buried H profile steel 1 in the foundation trench hole 7 dug, and welding spiral shell is respectively perpendicular at the both ends of H profile steel
Bolt 2 reserves drilling position at 1 center of H profile steel, then pours foundation trench and cheats 7 inner cushion layer concrete 3, and pouring height is foundation trench bottom surface
To the half of 1 height of H profile steel, the intensity of concrete 3 reaches the 75% of design strength, carries out next process；Concrete 3 is
C20 concrete.The pre-buried depth of H profile steel 1 is 60cm, and depth can adjust according to field condition；
Step 2, in 1 centre-drilling hole of H profile steel, presstressed reinforcing steel 4 is worn downwards from hole-drilled center；Presstressed reinforcing steel 4 is steel
Tree lace.
Detailed process is as follows for step 2:
It using drilling machine, drills in the drilling position that 1 center of H profile steel is reserved, aperture is 10~15cm, drilling depth
It is identical as the horizontal plate thickness of H profile steel plate 1, i.e., hole is drilled through H profile steel plate 1；
Bottom anchor 5 is covered in 4 bottom of presstressed reinforcing steel, presstressed reinforcing steel 4 is inserted into vertically downward from the hole that H profile steel 1 is drilled, bottom anchor
5 connection steel strand wires are downwardly into from the vertical air that H profile steel 1 is drilled together, until bottom anchor 5 contacts with the bottom surface of embedded hole 10 and is
Only；
Step 3, slip casting in the hole bored to step 2；
Detailed process is as follows for step 3: the hole being drilled by pneumatic hose to 1 center of H profile steel using slip casting machine pressure pump
Interior carry out slip casting, until slurries reach concordant with the following height of 1 centre bore of H profile steel.
The pressure of grouting pressure pump in step 3 controls between 0.1~1.0mpa, and Grouting Pipe is apart from bottom hole 0.5m, note
The construction method that marginal not slurry side tube drawing is preferably used during slurry, until slurries reach the lower part hole edge of H profile steel.
Slip casting slurry in step 3 is prepared using following steps:
Step A, weighing
By cement, sand, rubber powder, new material, water and water-reducing agent with 1:1:0.05:0.08:0.07~0.1:0.5:0.01
Ratio weigh, wherein new material is the mixture of swelling agent and Hua Qiansu, and the mixed proportion of swelling agent and Hua Qiansu are
7:3；
Step B, stirring
Load weighted cement, sand, rubber powder and new material are sequentially added in cement mortar mixer and are stirred, low speed
After stirring 20~40s, water and water-reducing agent 20~40s of high-speed stirred is added, stops mixing 80~100s, by blade and is stirred with rubber scraping
The glue mixed on machine inner wall is scraped in blender, and 50~70s of stirring is further continued for；The revolving speed stirred at low speed in step B is 135-145r/
min；The revolving speed of step B high speed stirring is 270-290r/min.
Step C enters mould, makes test specimen
The material that step 2 is stirred is divided two layers and is fitted into die trial, with a metal ruler along die trial top plane, from die trial top
One end, moved with setting up a separatist regime by force of arms movement to the other end on die trial top along die trial length direction, the placing direction of metal scale and die trial are long
It is vertical to spend direction, disposably scrapes off glue sand extra in die trial, and smoothed out surface of test piece with metal ruler；
Step D, maintenance
After test specimen completes, die trial is marked, band die trial is put into maintenance in fog room, until providing demoulding time
20~demould for 24 hours, test specimen is put into fog room until regulation age after demoulding.
Step 4,1 side installs guardrail steel construction 6 in H profile steel；
Detailed process is as follows for step 4: guardrail steel construction 6 is horizontally arranged to the top of H profile steel 1, guardrail steel construction 6
Both ends pass through the both ends of H profile steel 1, and nut 7 is screwed on bolt 2 and guardrail steel construction 6 and H profile steel 1 are fixed together, and to guardrail
Casting concrete in steel construction 6 and foundation trench hole 7, until the upper surface being poured into foundation trench cheats 7 is concordant.
Step 5, rectangular steel tube 8 is installed above the guardrail steel construction 6 that step 4 is installed, and is poured into rectangular steel tube 8 mixed
Solidifying soil 3；
The detailed process of step 5 are as follows: the casting concrete into rectangular steel tube 8, and pour to downward away from 8 nozzle of rectangular steel tube
At 10~15cm, and vibrate and keep overall structure more closely knit.
Step 6, tensioning, sealing off and covering anchorage are carried out to presstressed reinforcing steel 4.
Detailed process is as follows for step 6:
Backing plate with centre bore is covered in the upper end of presstressed reinforcing steel 4, then intermediate plate anchorage is coaxially socketed in prestressing force
The upper end of muscle 4；Backing plate is vertically arranged with presstressed reinforcing steel 4, guarantees uniform force when tensioning；The specific tensioning of presstressed reinforcing steel 4 point
Following two stages:
First stage: after the completion of 8 inner concrete of rectangular steel tube pours for 24 hours after, when 8 inner concrete intensity of rectangular steel tube
More than or equal to design strength 30% when, by tension tool and intermediate plate anchorage (tension tool and intermediate plate anchorage be existing structure)
Connection carries out tensioning to presstressed reinforcing steel 4, and tension stress value is 0.3~0.5 σ con；
Second stage: after 8 inner concrete of rectangular steel tube pours 5~7d of completion, and concrete strength reaches design strength
75% when, tensioning uses ultra stretching, and tension stress is 1.05~1.15 σ con, hold 2~3min of lotus, then after being offloaded to σ con,
Too long presstressed reinforcing steel 4 is cut off, is cut using mechanical means, forbids to separate using electric arc, presstressed reinforcing steel 4 exposes anchorage after cutting off
Length outside intermediate plate cannot be less than 30mm, buckle 9 is caught at the upper port of rectangular steel tube 8, and be carried out with high-strength cement mortar
Sealing off and covering anchorage.
Claims (8)
1. a kind of anticollision barrier construction method for highway, it is characterised in that: specifically comprise the following steps:
Step 1, excavation pit bores 6~12m embedded hole (10) in foundation pit bottom center, the embedded hole (10) vertically downward
It pre-buried H profile steel (1) and is poured blinding concrete (3), embedded hole (10) for pre- buried end anchor and presstressed reinforcing steel, while in foundation pit
Positioned at the underface at H profile steel (1) center；
Step 2, in H profile steel (1) centre-drilling hole, presstressed reinforcing steel (4) are worn downwards from hole-drilled center；
Step 3, slip casting in the hole bored to step 2；
Step 4, (1) just installation guardrail steel construction (6) in H profile steel；
Step 5, rectangular steel tube (8) are installed above the guardrail steel construction (6) that step 4 is installed, and are poured into rectangular steel tube (8)
Concrete (3)；
Step 6, tensioning, sealing off and covering anchorage are carried out to presstressed reinforcing steel (4).
2. a kind of anticollision barrier construction method for highway according to claim 1, it is characterised in that: the step 1
Detailed process is as follows:
Step 1.1, cloth hole is carried out on construction ground, and the pitch-row between adjacent holes is 2~3 meters, is checked and is carried out after cloth hole
Then telltale mark carries out foundation trench excavation in the hole location of label, after being excavated to substrate elevation, carry out to foundation trench hole (7) surrounding
Strike off processing；
Step 1.2,6~12m embedded hole (10) are bored vertically downward at foundation pit slot (7) bottom center dug；
Step 1.3, the lateral pre-buried H profile steel (1) in the foundation trench hole (7) dug, and welding spiral shell is respectively perpendicular at the both ends of H profile steel
Bolt (2) reserves drilling position at H profile steel (1) center, then pours foundation trench hole (7) inner cushion layer concrete (3), pours height and is
Foundation trench bottom surface to H profile steel (1) height half.
3. a kind of anticollision barrier construction method for highway according to claim 2, it is characterised in that: the step 2
Detailed process is as follows:
Step 2.1, it using drilling machine, drills in the drilling position that H profile steel (1) center is reserved, aperture is 10~15cm, is bored
Hole depth is identical as the horizontal plate thickness of H profile steel plate (1), i.e., H profile steel plate (1) is drilled through to hole；
Step 2.2, bottom anchor (5) are covered in presstressed reinforcing steel (4) bottom, from the hole that H profile steel (1) is drilled vertically downward by presstressed reinforcing steel
Insertion, until bottom anchor (5) is contacted with the bottom surface of embedded hole (10).
4. a kind of anticollision barrier construction method for highway according to claim 3, it is characterised in that: the step 3
Detailed process is as follows: slip casting is carried out in the hole being drilled by pneumatic hose to H profile steel (1) center using slip casting machine pressure pump,
Until slurries reach concordant with the following height of H profile steel (1) centre bore.
5. a kind of anticollision barrier construction method for highway according to claim 4, it is characterised in that:
Slip casting slurry in step 3 is prepared using following steps:
Step A, weighing
By cement, sand, rubber powder, new material, water and water-reducing agent with the ratio of 1:1:0.05:0.08:0.07~0.1:0.5:0.01
Example weighs, and wherein new material is the mixture of swelling agent and Hua Qiansu, and the mixed proportion of swelling agent and Hua Qiansu are 7:3；
Step B, stirring
Load weighted cement, sand, rubber powder and new material are sequentially added in cement mortar mixer and are stirred, is stirred at low speed
After 20~40s, water and water-reducing agent 20~40s of high-speed stirred is added, stops mixing 80~100s, with rubber scraping by blade and blender
Glue on inner wall is scraped in blender, and 50~70s of stirring is further continued for；The revolving speed stirred at low speed in step B is 135-145r/min；
The revolving speed of step B high speed stirring is 270-290r/min.
Step C enters mould, makes test specimen
The material that step 2 is stirred is divided two layers and is fitted into die trial, with a metal ruler along die trial top plane, from the one of die trial top
End is moved along die trial length direction with setting up a separatist regime by force of arms movement to the other end on die trial top, the placing direction of metal scale and die trial length side
To vertical, disposably glue sand extra in die trial is scraped off, and smoothed out surface of test piece with metal ruler；
Step D, maintenance
After test specimen completes, die trial is marked, band die trial is put into maintenance in fog room, until regulation demoulding time 20~
It demoulds for 24 hours, test specimen is put into fog room until regulation age after demoulding.
6. a kind of anticollision barrier construction method for highway according to claim 4, it is characterised in that: the step 4
Detailed process is as follows: guardrail steel construction (6) being horizontally arranged to the top of H profile steel (1), the both ends of guardrail steel construction (6) are worn
The both ends of H profile steel (1) are crossed, nut (7) is screwed on bolt (2) and guardrail steel construction (6) and H profile steel (1) is fixed together, and to
Guardrail steel construction (6) and foundation trench cheat (7) interior casting concrete, until be poured into foundation trench cheat the upper surface of (7) it is concordant until.
7. a kind of anticollision barrier construction method for highway according to claim 6, it is characterised in that: the step 5
Detailed process are as follows: to rectangular steel tube (8) interior casting concrete, and pour to away from rectangular steel tube (8) downward 10~15cm of nozzle
Place, and vibrate and keep overall structure more closely knit.
8. a kind of anticollision barrier construction method for highway according to claim 7, it is characterised in that: the step 6
Detailed process is as follows:
Backing plate with centre bore is covered in the upper end of presstressed reinforcing steel (4), then by intermediate plate anchorage installation in the upper of presstressed reinforcing steel (4)
End；The backing plate is vertically arranged with presstressed reinforcing steel (4), guarantees uniform force when tensioning；The specific tensioning of presstressed reinforcing steel (4) point
Following two stages:
First stage: rectangular steel tube (8) inner concrete pour after the completion of for 24 hours after, when rectangular steel tube (8) inner concrete intensity
More than or equal to design strength 30% when, tension tool is connect with intermediate plate anchorage, to presstressed reinforcing steel (4) carry out tensioning, tensioning
Stress value is 0.3~0.5 σ con；
Second stage: after rectangular steel tube (8) inner concrete pours 5~7d of completion, and concrete strength reaches design strength
When 75%, tensioning uses ultra stretching, and tension stress is 1.05~1.15 σ con, holds 2~3min of lotus, then after being offloaded to σ con, cut
Except too long presstressed reinforcing steel (4), the length exposed outside anchor clipper after presstressed reinforcing steel (4) cutting is not less than 30mm, by buckle (9)
It is caught at the upper port of rectangular steel tube (8), and carries out sealing off and covering anchorage with high-strength cement mortar.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110295543A (en) * | 2019-07-02 | 2019-10-01 | 烟台大学 | A kind of science of bridge building prefabricated assembled anticollision barrier and its construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295543A (en) * | 2019-07-02 | 2019-10-01 | 烟台大学 | A kind of science of bridge building prefabricated assembled anticollision barrier and its construction method |
| CN110295543B (en) * | 2019-07-02 | 2024-05-14 | 烟台大学 | Prefabricated anti-collision guardrail for bridge engineering and construction method thereof |
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