CN106968139A - Construction method of railway subgrade support during jacking of frame bridges passing under railway - Google Patents
Construction method of railway subgrade support during jacking of frame bridges passing under railway Download PDFInfo
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- CN106968139A CN106968139A CN201710139039.5A CN201710139039A CN106968139A CN 106968139 A CN106968139 A CN 106968139A CN 201710139039 A CN201710139039 A CN 201710139039A CN 106968139 A CN106968139 A CN 106968139A
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- 238000010276 construction Methods 0.000 title claims abstract description 52
- 238000013461 design Methods 0.000 claims abstract description 27
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- 229910000831 Steel Inorganic materials 0.000 claims description 60
- 239000010959 steel Substances 0.000 claims description 60
- 230000008093 supporting effect Effects 0.000 claims description 30
- 238000004873 anchoring Methods 0.000 claims description 15
- 238000007569 slipcasting Methods 0.000 claims description 13
- 239000004567 concrete Substances 0.000 claims description 12
- 239000011150 reinforced concrete Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
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- 210000000481 breast Anatomy 0.000 description 5
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- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 235000019994 cava Nutrition 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 238000005755 formation reaction Methods 0.000 description 2
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- 239000004575 stone Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000001556 precipitation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
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Abstract
本发明属于铁路顶进框构桥施工技术领域，公开了一种下穿铁路顶进框构桥顶进过程中铁路路基支护的施工方法，通过在既有路基两侧浇筑基桩，在既有路基下方埋设锚索并张紧在所述基桩上，实现了对既有路基的支护；本发明采用桩锚式结构，结构简单，设计合理，提高了支护结构的整体性，受力性能强；锚索能施加预应力，控制支护结构的变形量，减小对周边建筑物的影响，且预应力的大小及作用点可根据需要调整；锚索埋设在路基下方的结构，抵消了路基的侧压力，顶进时，侧天窗不需放坡，可垂直开挖，增加了施工的空间，使得顶进施工更加方便；支护结构简单，施工方便，支护效果显著，避免了路基坍塌的隐患，提高了工程安全性。
The invention belongs to the technical field of railway jacking frame bridge construction, and discloses a construction method for railway subgrade support during the jacking process of a railway jacking frame bridge passing under a railway. By pouring foundation piles on both sides of the existing subgrade, the Anchor cables are buried under the subgrade and tensioned on the foundation piles to realize the support of the existing subgrade; the invention adopts a pile-anchor structure, which has a simple structure and a reasonable design, and improves the integrity of the support structure. Strong mechanical performance; the anchor cable can apply prestress, control the deformation of the support structure, and reduce the impact on surrounding buildings, and the size and action point of the prestress can be adjusted according to needs; the anchor cable is embedded in the structure under the subgrade, It offsets the side pressure of the subgrade. When jacking, the side skylight does not need to be sloped, and can be excavated vertically, which increases the construction space and makes the jacking construction more convenient; the support structure is simple, the construction is convenient, and the support effect is remarkable, avoiding The hidden danger of subgrade collapse is eliminated, and the safety of the project is improved.
Description
Technical field
The present invention relates to railway jacking framed bridge technical field of construction, more particularly to a kind of undercrossing tunnel jacking framed bridge top
The construction method of railway bed supporting during entering.
Background technology
With the fast development of economic society, railway passenger and goods flow also increases substantially, the capacity of major part existing railway
The need for being not suitable with transport growth, it is necessary to carry out capacity expansion revamping.Increase in running railway line and build in two wire process, pass through existing iron
Road project is increasing, and because jacked frame bridge is passed through, both wired and foundation ditch is deeper, in jacked frame bridge jack-in process, both
There is railway bed all to there is the risk caved in, seriously threaten the safety of railway operation.It presently, there are many subgrade strengthenings
Scheme：
Rotary churning pile scheme, is consolidated by churning cement base surrounding formation of satisfying the need, and improves its anti-ability of caving in, and play
Sealing effect.This scheme is influenceed by geological conditions, and some areas are not suitable for using；
Open caisson scheme, using reinforced concrete open caisson, resists excavation of foundation pit rear wall pressure, so as to play protection to railway
Effect.The program has obtained successful utilization in many engineerings, but because existing line side construction space is limited, work progress
Whard to control, there is also drawback for the program；
Fender pile scheme, supporting is carried out to roadbed using cast-in-place concrete pile, but pile foundation is by the outside thrust of roadbed, holds
Easily cause pile foundation inclination.
The content of the invention
(1) technical problem to be solved
The technical problem to be solved in the present invention is：To solve in jacked frame bridge jack-in process, the operation of partial protection scheme
Easily limited and can not be implemented by soil property, construction space, the problem of there is potential safety hazard again in enforceable scheme.
(2) technical scheme
In order to solve the above-mentioned technical problem, the invention provides railway in a kind of undercrossing tunnel jacking framed bridge jack-in process
The construction method of roadbed supporting, comprises the following steps：
The position for the pile foundation that S1, determination are irrigated by armored concrete：Multiple pile foundations are divided along existing railway bearing of trend
Cloth and positioned at existing railway both sides, the pile foundation vertical is set and positioned at vertical existing railway direction with jacking framed bridge abutment wall
At the outside 1~2m in outside；
S2, borehole, often section dug rear casting reinforced concrete retaining wall and poured the space of pile foundation to be formed；Borehole reaches design
Mark after depth, carry out bottom hole processing；
S3, pour pile foundation；
After S4, pile foundation intensity are up to standard, Guan Liang is poured in the stake top of the pile foundation, the Guan Liang is simultaneously same with existing railway
The reinforced concrete continuous beam structure of all pile foundations connection of side；
S5, excavation jacking framed bridge working pit to first layer anchorage cable design position, from the region between adjacent pile foundation towards both
Have and oliquely downward bore anchor hole on the inside of railway；
S6, work out, wear anchor cable：By the connection of Grouting Pipe, stirrup ring, tensioner ring, guiding cap and steel strand wires；Anchor cable has been worked out
Cheng Hou, the anchor hole is penetrated by anchor cable one end, and the anchor cable other end is stayed in outside anchor hole；
S7, anchor cable penetrate after immediately to anchor hole slip casting；
S8, making waist rail and waist rail bracket：Waist rail and bracket are welded using shaped steel；
S9, install waist rail bracket, expansion bolt is squeezed into pile foundation by design attitude, with nut by waist rail bracket respectively with
Multiple pile foundation sides；
After S10, waist rail bracket are installed, waist rail is placed on above the waist rail bracket between adjacent pile foundation, uses high-strength bolt
Waist rail is fixed on waist rail bracket；
Slip casting in S11, anchor hole reaches after design strength that anchor cable is simultaneously locked on the waist rail by stretch-draw anchor；
S12, repeat the step S5-S11, next layer of anchor cable is installed, until all anchor cable installations；
S13, the jacking construction for carrying out jacking framed bridge.
Wherein, in the step S6, when working out the anchor cable, the guide head is arranged on steel strand wires one end, and from
Rise along steel strand wires length direction and tensioner ring and stirrup ring are disposed alternately on the steel strand wires in this one end；The anchor cable is included only
Free segment with steel strand wires penetrates described with the guide head, tensioner ring, the anchoring section of stirrup ring, the anchoring section is provided with
Anchor hole, the steel strand wires of the free segment are connected by anchorage with the waist rail.
Wherein, in the step S8, the waist rail is made up of the bottom plate and top plate be arrangeding in parallel, the bottom plate and top plate
Between the waist rail supporting welding that is made up of two rows I-steel connect, inner side steel plate is connected with by floor on the top plate,
Outside plate is fitted with the inner side steel plate, plane where the outside plate, inner side steel plate is each perpendicular to the anchor cable
Length direction；Offer the guiding for wearing the anchor cable successively on the outside plate, inner side steel plate, top plate, bottom plate
Hole.
Wherein, the anchor cable sets three layers.
Wherein, in the step S2, it is 1 meter often to save depth.
Wherein, in the step S5, anchor hole is bored using Pneumatic down-hole impact drill.
(3) beneficial effect
Above-mentioned technical proposal has the following advantages that：Railway road in a kind of undercrossing tunnel jacking framed bridge jack-in process of the present invention
The construction method of base supporting, by pouring foundation pile in existing roadbed both sides, anchor cable is buried below existing roadbed and institute is stretched in
State on foundation pile, realize the supporting to existing roadbed；The present invention uses stake anchoring component, simple in construction, reasonable in design, improves
The globality of supporting construction, stress performance is strong；Anchor cable can apply prestressing force, control the deflection of supporting construction, reduce to periphery
The influence of building, and prestressed size and application point can adjust as needed；Anchor cable is embedded in the structure below roadbed, supports
Disappeared the lateral pressure of roadbed, and during jacking, clerestory is not required to slope, can vertical cut, add the space of construction so that jacking is applied
Work more facilitates；Supporting construction is simple, easy construction, supporting effect is notable, it is to avoid the hidden danger that roadbed caves in, and improves engineering
Security.
Brief description of the drawings
Fig. 1 is overall structure sectional schematic diagram of the present invention；
Fig. 2 is overall structure floor map of the present invention；
Fig. 3 is Guan Liang, anchor cable horizontal layout schematic diagram in the present invention；
Fig. 4 is breast beam structure schematic diagram in the present invention；
Fig. 5 is stream line structure skiagraph of the present invention；
Fig. 6 is stream line structure transverse face figure of the present invention；
Fig. 7 is waist rail bracket schematic diagram in the present invention.
Wherein, 1, pile foundation；2nd, Guan Liang；3rd, waist rail bracket；4th, waist rail；4-1, bottom plate；4-2, top plate；4-3, waist rail support；
4-4-1, outside plate；4-4-2, inner side steel plate；4-5, pilot hole；4-6, floor；5th, anchor cable；5-1, anchorage；5-2, Grouting Pipe；
5-3, steel strand wires；5-4, guide head；5-5, tensioner ring；5-6, stirrup ring；6th, anchor hole.
Embodiment
With reference to the accompanying drawings and examples, the embodiment to the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
In the description of the invention, it is necessary to explanation, unless otherwise indicated, " more than " scope include this number, it is " many
It is individual " it is meant that two or more；Term " on ", " under ", "left", "right", " interior ", " outer ", " front end ", " rear end ", " head ",
The orientation or position relationship of instructions such as " afterbodys " are, based on orientation shown in the drawings or position relationship, to be for only for ease of description originally
Invention and simplified description, rather than instruction or the signified device of hint or element must be with specific orientation, with specific square
Position construction and operation, therefore be not considered as limiting the invention.In addition, term " first ", " second ", " the 3rd " etc. are only used
In description purpose, and it is not intended that indicating or implying relative importance.
In the description of the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " installation ",
" connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly be connected
Connect；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary.It is right
For one of ordinary skill in the art, visual concrete condition understands the concrete meaning of above-mentioned term in the present invention.
The invention discloses a kind of construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process, bag
Include following steps：
The position for the pile foundation that S1, determination are irrigated by armored concrete：Multiple pile foundations are divided along existing railway bearing of trend
Cloth and positioned at existing railway both sides, the pile foundation vertical is set and positioned at vertical existing railway direction with jacking framed bridge abutment wall
At the outside 1~2m in outside；Pile foundation quantity, length, spacing are determined according to calculating.
S2, borehole, often section dug rear casting reinforced concrete retaining wall and poured the space of pile foundation to be formed；Down construct when with
Often save and circulated as a construction, that is, pour into a mould concrete guard wall after digging good often section, then excavate next section；Borehole reaches that design mark is deep
After degree, bottom hole processing is carried out, accomplishes smooth, without soft formations such as loose slag, sludge and precipitations；
S3, pour pile foundation；Poured in the space surrounded to foregoing more piece concrete guard wall, it is vertically arranged to be formed
Pile foundation；
After S4, pile foundation intensity are up to standard, Guan Liang is poured in the stake top of the pile foundation, the Guan Liang is simultaneously same with existing railway
The reinforced concrete continuous beam structure of all pile foundations connection of side；
S5, excavation jacking framed bridge working pit to first layer anchorage cable design position, from the region between adjacent pile foundation towards both
Have and oliquely downward bore anchor hole on the inside of railway；
S6, work out, wear anchor cable：By the connection of Grouting Pipe, stirrup ring, tensioner ring, guiding cap and steel strand wires；Anchor cable has been worked out
Cheng Hou, the anchor hole is penetrated by anchor cable one end, and the anchor cable other end is stayed in outside anchor hole；
S7, anchor cable penetrate after immediately to anchor hole slip casting；Anchor hole slip casting is constructed using degassing method secondary grouting；
S8, making waist rail and waist rail bracket：Waist rail and bracket are welded using shaped steel；
S9, install waist rail bracket, expansion bolt is squeezed into pile foundation by design attitude, with nut by waist rail bracket respectively with
Multiple pile foundation sides；
After S10, waist rail bracket are installed, waist rail is placed on above the waist rail bracket between adjacent pile foundation, uses high-strength bolt
Waist rail is fixed on waist rail bracket；
Slip casting in S11, anchor hole reaches after design strength that anchor cable is simultaneously locked on the waist rail by stretch-draw anchor；
S12, repeat the step S5-S11, next layer of anchor cable is installed, until all anchor cable installations；
S13, the jacking construction for carrying out jacking framed bridge.
The present invention uses stake anchoring component, simple in construction, reasonable in design, improves the globality of supporting construction, stress
Can be strong；Anchor cable can apply prestressing force, control the deflection of supporting construction, reduce the influence to surrounding building, and prestressed
Size and application point can be adjusted as needed；Anchor cable is embedded in the structure below roadbed, counteracts the lateral pressure of roadbed, jacking
When, clerestory is not required to slope, can vertical cut, add the space of construction so that jacking construction more facilitate；Supporting construction letter
Single, easy construction, supporting effect is notable, it is to avoid the hidden danger that roadbed caves in, and improves engineering safety.
Specifically, in the step S6, when working out the anchor cable, the guide head is arranged on steel strand wires one end, and
Tensioner ring and stirrup ring are disposed alternately on the steel strand wires along steel strand wires length direction from this one end；The anchor cable includes
Only there is the free segment of steel strand wires and the guide head, tensioner ring, the anchoring section of stirrup ring is provided with, the anchoring section penetrates institute
Anchor hole is stated, the steel strand wires of the free segment are connected by anchorage with the waist rail.
Wherein, in the step S8, the waist rail is made up of the bottom plate and top plate be arrangeding in parallel, the bottom plate and top plate
Between the waist rail supporting welding that is made up of two rows I-steel connect, inner side steel is connected with by floor 4-6 on the top plate
Outside plate is fitted with plate, the inner side steel plate, plane where the outside plate, inner side steel plate is each perpendicular to the anchor cable
Length direction；Offered successively on the outside plate, inner side steel plate, top plate, bottom plate for wearing leading for the anchor cable
To hole 4-5.Waist rail and bracket use section steel manufacture, and shaped steel uses plasma cut, and welding uses manual electric arc welding, passes through experiment
It is determined that optimal welding parameter.Strictly by design drawing processing when waist rail is processed, it is ensured that the position of each part of waist rail is accurate, weldering
Connect quality testing qualified.
It is preferred that, the anchor cable sets three layers.
It is preferred that, in the step S2, it is 1 meter often to save depth.
It is preferred that, in the step S5, anchor hole is bored using Pneumatic down-hole impact drill.
Referring to shown in Fig. 1,2, in the present embodiment, supporting construction is pile-anchor supporting system, is preced with by subgrade protection stake 1, stake top
Beam 2, waist rail bracket 3, waist rail 4, anchor cable 5 are constituted, and connected each other, influence each other, are interacted between these parts, are formed
One organic whole.
Shown in Figure 1, foundation pile 1 described in the present embodiment is reinforced concrete pile, is artificial digging pile.Stake stake footpath and
Stake is long to be determined according to geology and environmental condition by calculating, and this example stake footpath is 1.2m, and stake spacing 0.6m, concrete grade is adopted
With C30, Reinforcement uses HRB400 grades, and tie hoop often uses HPB300 reinforcing bars.Manual digging pile construction program is:Survey
Amount setting-out and fixed pile → aperture guard ring is poured → excavate the first segment stake holes earthwork → pile foundation center detection → branch retaining wall mould
Plate → pour the first segment breast wall concrete → removing cubic metre of earth and stone → illuminating lamp, ventilation blower, water pump etc. → excavation, the stake of handling second section
The hole earthwork → branch dado template → detecting pile foundation center → pours second section breast wall concrete → down cycle operation successively
→ excavating the base expanding and base expanding portion cubic meter of stone → stake holes of inspecting for acceptance.
Referring to shown in Fig. 1,2,3, stake top described in the present embodiment sets Guan Liang 2 and connected, and stake top Guan Liang 2 is in subgrade protection stake 1
Constructed after the completion of construction, using armored concrete.Require that stake cage bar is anchored into inside Guan Liang in this example, Guan Liang width is equal to stake
Diameter, is 1.2m, and hat depth of beam is 1m.
It is shown in Figure 1, longitudinal waist rail 4, the structure of anchor cable 5 are set in the present embodiment between stake, 3 rows are set altogether from top to bottom.
Referring to shown in Fig. 1,4,5, waist rail 4 uses shaped steel and steel plate welding production in the present embodiment.Bottom plate 4-1 and top plate 4-
2 use 350 × 444 × 20mm steel plates, and steel plate is correspondingly positioned at reserved radius 50mm pilot hole 4-5；Waist rail support 4-3 is used
I28a I-steel；Waist rail 4 is oriented to anchor slab using two layers of 20mm iron plates composition.Waist rail 4 is oriented to anchor slab outside plate 4-4-1 sizes
180×200×20mm；Inner side steel plate 4-4-2 sizes are 180 × 320 × 20mm.It is oriented to anchor slab outside plate 4-4-1 reserved half
Footpath 50mm pilot hole 4-5, inner side steel plate 4-4-2 reserve radius 35mm pilot hole 4-5.It is oriented to anchor slab outside plate 4-4-1
Weld together with inner side steel plate 4-4-2, reserving pilot hole 4-5 needs with one heart.After the completion of waist rail 4 is welded, its bottom plate 4-1 and top plate
4-2 reserves pilot hole 4-5, and being oriented to the reserved pilot hole 4-5 of anchor slab outside plate 4-4-1 and inner side steel plate 4-4-2 need to be concentric.Waist rail
4 effect is that the concentration prestressed load of anchor cable, anchorage generation is evenly spread into pile foundation 1, then to subgrade soil, so as to adjust
Earth stress direction, is reinforced to roadbed side slope.Waist rail bracket 3 is processed using shaped steel, first bracket 3 by design position during installation
Put and be anchored in pile foundation 1, waist rail 4 is provided on the top of bracket 3 using screw.
Referring to shown in Fig. 1,6,7, the present embodiment stream line 5 is by 6 groups of anchorage 5-1, Grouting Pipe 5-2 and steel strand wires 5-3, anchor hole
Into.Anchorage 5-1 is OVM15 anchorages, the reserved injected hole in centre.Grouting Pipe 5-2 is through in the middle of steel strand wires 5-3 to be tightened with tied silk, is prevented
Come off when only casting anchor.Steel strand wires 5-3 uses diameter 15.2mm steel strand wires, is divided into free segment and anchoring section, and anchoring section uses M20 sand
Slurry anchoring.Tapered guiding cap 5-4 is installed on anchoring section top, using φ 50mm steel pipe manufacturings.Anchoring section places a positioning per 2m
Tensioner ring 5-5, tensioner ring is using the plastic product shaped；One stirrup ring 5-6 is set in two tensioner rings, and stirrup ring uses 2# lead
Silk.Steel strand wires 5-3 free segment preservations, then on each steel hinge line set on 20mm plastic tube.Hole depth is anchor cable
Anchoring depth adds free end length, and the diameter of anchor hole 6 is not less than 300mm.
Shown in Figure 6, the drilling of anchor hole 6 is rushed after anchor cable hole site is determined using Pneumatic down-hole in the present embodiment
Hit churn to be drilled, when rig is installed, it is necessary to the angle of strict control drilling rod and horizontal plane, drilling must be using dry
Bore, water drilling must not be used, to ensure the caking ability of slip casting and hole wall, the aperture of drilling is in strict accordance with the construction of design aperture.Drilling
Depth be greater than hole depth 40cm of design or so, drilling is reached after depth, surely to be bored 2~3 minutes, it is ensured that hole depth meets design
It is required that.After the completion of drilling, borehole cleaning is carried out using high-pressure blast, no dust or debris blowout is treated, pore-forming inspection is carried out to anchor cable hole again
Look into, drilling technique index is as follows：Anchor cable hole meets hole position tolerance ± 50mm；0~+10mm of depth tolerance；Aperture permits
Perhaps 0~+10mm of deviation；Inclination angle tolerance 1%；Anchor cable length -30~100mm of tolerance, drilling is through after the assay was approved, blocking up
Good aperture, waits lower step process construction.
Shown in Figure 4, the establishment of the present embodiment stream line 5 is a relatively simple working procedure, and its work is exactly
By through examining qualified steel strand wires and various accessories, bunchy, hole to be entered are woven by design drawing.This engineering anchor cable is using 3 φ
15.2mm high intensity, underrelaxation steel strand manufacturing, its tensile strength must not be less than 1860Mpa.In strict accordance with design drawing during establishment
Paper sets the parts such as Grouting Pipe, stirrup ring, tensioner ring, guiding cap.
It is shown in Figure 4, in the present embodiment after the completion of anchor cable 5 casts anchor, to avoid deposit influence grouting matter in anchor hole
Amount should slip casting immediately.Injecting paste material selects M20 cement mortar.Cement mortar answers uniform mixing, with mixing with the cement once mixed and stirred
Mortar should be finished before initial set.Anchor hole slip casting is constructed using degassing method secondary grouting.First time slip casting returns slurry using bottom hole
Method slip casting, mortar is injected by bottom hole, untill slurry is overflow in aperture, and full section once grouting is completed, the pressure of slip casting not less than 0.6~
0.8Mpa。
It is shown in Figure 4, in the present embodiment anchor cable 5 tensioning, be locked in anchorage mortar, anchor pier intensity and reach that design is strong
After degree 80%, before anchorage cable stretching construction, representational work anchor cable is selected, hole count requirement is work anchor cable sum
3% and no less than 3 holes, non-destructive pulling test is carried out, the proof stress of pulling test uses 1.2 times of locking stress, with
The reasonability of design and the reliability of anchor cable anchor-hold are verified, while checking and control construction quality.During the formal tensioning of anchor cable, first adopt
Examination drawing is carried out with 10%~20% design tensile load, tensioning 1~2 time is tried to anchor cable, makes its each location contacts close, steel is twisted
Line is totally straight.Successive loading again, whole stretching process point Pyatyi carry out loading, i.e. design load 0.25,0.5,0.75,
1.0th, 1.1 times of tensioning.After every grade of load applies, stable observation time is not less than 10min.If 10min relative shift is small
It is stable in 1mm, otherwise continues to observe, until meeting after condition of the displacement less than 1mm, anchor cable is locked.Anchor cable is locked
Afterwards after 3 days, if finding, prestressd anchor cable is lossy, should be relocked after tensioning is compensated.
1st, this technology uses stake anchoring component, simple in construction, reasonable in design, improves the globality of supporting construction, stress
Performance is strong.
2nd, anchor cable can apply prestressing force, control the deflection of supporting construction, reduce the influence to surrounding building, and in advance should
The size and application point of power can be adjusted as needed.
3rd, due to the use with anchor cable, the lateral pressure of roadbed is counteracted, during jacking, clerestory is not required to slope, can vertically opened
Dig, add the space of construction so that jacking construction is convenient.
4th, supporting construction is simple, and easy construction, supporting effect is notable, it is to avoid the hidden danger that roadbed caves in, and improves engineering safety
The construction method of property.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and replacement can also be made, these improve and replaced
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. the construction method of railway bed supporting in a kind of undercrossing tunnel jacking framed bridge jack-in process, it is characterised in that including
Following steps：
The position for the pile foundation that S1, determination are irrigated by armored concrete：Multiple pile foundations along existing railway bearing of trend be distributed and
Positioned at existing railway both sides, the pile foundation vertical is set and positioned at vertical existing railway direction with the outside of jacking framed bridge abutment wall
At outside 1~2m；
S2, borehole, often section dug rear casting reinforced concrete retaining wall and poured the space of pile foundation to be formed；Borehole reaches that design mark is deep
After degree, bottom hole processing is carried out；
S3, pour pile foundation；
After S4, pile foundation intensity are up to standard, Guan Liang is poured in the stake top of the pile foundation, the Guan Liang for simultaneously with existing railway the same side
All pile foundations connection reinforced concrete continuous beam structure；
S5, jacking framed bridge working pit is excavated to first layer anchorage cable design position, from the region between adjacent pile foundation towards existing iron
Anchor hole is oliquely downward bored on the inside of road；
S6, work out, wear anchor cable：By the connection of Grouting Pipe, stirrup ring, tensioner ring, guiding cap and steel strand wires；Anchor cable is worked out
Afterwards, anchor cable one end is penetrated into the anchor hole, the anchor cable other end is stayed in outside anchor hole；
S7, anchor cable penetrate after immediately to anchor hole slip casting；
S8, making waist rail and waist rail bracket：Waist rail and bracket are welded using shaped steel；
S9, install waist rail bracket, expansion bolt is squeezed into pile foundation by design attitude, with nut by waist rail bracket respectively with it is multiple
Pile foundation side；
After S10, waist rail bracket are installed, waist rail is placed on above the waist rail bracket between adjacent pile foundation, with high-strength bolt by waist
Beam is fixed on waist rail bracket；
Slip casting in S11, anchor hole reaches after design strength that anchor cable is simultaneously locked on the waist rail by stretch-draw anchor；
S12, repeat the step S5-S11, next layer of anchor cable is installed, until all anchor cable installations；
S13, the jacking construction for carrying out jacking framed bridge.
2. the construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process as claimed in claim 1, its
Be characterised by, in the step S6, when working out the anchor cable, the guide head be arranged on steel strand wires one end, and from this
Hold along steel strand wires length direction and tensioner ring and stirrup ring have been disposed alternately on the steel strand wires；The anchor cable includes only having
The free segment of steel strand wires and the guide head, tensioner ring, the anchoring section of stirrup ring are provided with, the anchoring section penetrates the anchor
Hole, the steel strand wires of the free segment are connected by anchorage with the waist rail.
3. the construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process as claimed in claim 1, its
It is characterised by, in the step S8, the waist rail is made up of the bottom plate and top plate be arrangeding in parallel, between the bottom plate and top plate
The waist rail supporting welding being made up of two rows I-steel is connected, and inner side steel plate is connected with by floor on the top plate, described
Outside plate is fitted with the steel plate of inner side, plane where the outside plate, inner side steel plate is each perpendicular to the length of the anchor cable
Direction；Offer the pilot hole for wearing the anchor cable successively on the outside plate, inner side steel plate, top plate, bottom plate.
4. the construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process as claimed in claim 1, its
It is characterised by, the anchor cable sets three layers.
5. the construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process as claimed in claim 1, its
It is characterised by, in the step S2, it is 1 meter often to save depth.
6. the construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process as claimed in claim 1, its
It is characterised by, in the step S5, anchor hole is bored using Pneumatic down-hole impact drill.
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