CN106968139B - The construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process - Google Patents
The construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process Download PDFInfo
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- CN106968139B CN106968139B CN201710139039.5A CN201710139039A CN106968139B CN 106968139 B CN106968139 B CN 106968139B CN 201710139039 A CN201710139039 A CN 201710139039A CN 106968139 B CN106968139 B CN 106968139B
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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
The invention belongs to railway jacking framed bridge technical field of construction, disclose a kind of construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process, by pouring foundation pile in existing roadbed both sides, anchor cable is buried below existing roadbed and is stretched on the foundation pile, and the supporting to existing roadbed is realized；The present invention uses stake anchoring component, simple in structure, reasonable design to improve the globality of supporting construction, and stress performance is strong；Anchor cable can apply prestressing force, control the deflection of supporting construction, reduce the influence to surrounding building, and prestressed size and position can adjust as needed；Anchor cable is embedded in the structure below roadbed, counteracts the lateral pressure of roadbed, and when jacking, clerestory is not required to slope, can vertical cut, increase the space of construction so that jacking construction is more convenient；Supporting construction is simple, easy for construction, and supporting effect is notable, avoids the hidden danger that roadbed caves in, improves engineering safety.
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
Into the construction method of railway bed supporting in the process.
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 needs that transport increases have been not suitable with it, it is necessary to carry out capacity expansion revamping.It is built in two wire process in running railway line increasing, passes through existing iron
Road project is increasing, since to pass through both wired and foundation pit deeper for jacked frame bridge, in jacked frame bridge jack-in process, both
There is railway bed all to there is the risk caved in, seriously threatens the safety of railway operation.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 influenced by geological conditions, and some areas are not suitable for using；
Open caisson scheme resists excavation of foundation pit rear wall pressure using reinforced concrete open caisson, to play protection to railway
Effect.The program has obtained successful utilization in many engineerings, but since existing line side construction space is limited, work progress
Not easy to control, there is also drawbacks for the program；
Fender pile scheme carries out supporting using cast-in-place concrete pile to roadbed, but pile foundation is held by the outside thrust of roadbed
Easily cause pile foundation inclination.
Invention content
(1) technical problems to be solved
The technical problem to be solved by the present invention is to：To solve in jacked frame bridge jack-in process, the operation of partial protection scheme
It is easy to be limited and can not be implemented by soil property, construction space, enforceable scheme has security risk again.
(2) technical solution
In order to solve the above technical problem, the present invention provides railways in a kind of undercrossing tunnel jacking framed bridge jack-in process
The construction method of roadbed supporting, includes the following steps：
S1, the position for determining pile foundation made of being perfused by armored concrete：Multiple pile foundations are along existing railway extending direction point
Cloth and be located at existing railway both sides, pile foundation vertical setting and positioned at vertical existing railway direction with jacking framed bridge abutment wall
At the outside 1~2m in outside；
S2, borehole, casting reinforced concrete retaining wall is to form the space for pouring pile foundation after often section has been dug；Borehole reaches design
After marking depth, bottom hole processing is carried out；
S3, pile foundation is poured；
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 same with existing railway simultaneously
The reinforced concrete continuous beam structure of all pile foundations connection of side；
S5, jacking framed bridge working pit is excavated to first layer anchorage cable design position, from the region between adjacent pile foundation towards both
Have and oliquely downward bores anchor hole on the inside of railway；
S6, it works out, wear anchor cable：Grouting Pipe, stirrup ring, tensioner ring, guiding cap and steel strand wires are connected；Anchor cable has been worked out
Anchor cable one end is penetrated the anchor hole by Cheng Hou, and the anchor cable other end stays in outside anchor hole；
S7, anchor cable penetrate after immediately to anchor hole slip casting；
S8, waist rail and waist rail bracket are made：Waist rail and bracket are welded using shaped steel；
S9, installation waist rail bracket, expansion bolt is squeezed into pile foundation by design position, with nut by waist rail bracket respectively with
Multiple pile foundation sides；
After S10, waist rail bracket install, waist rail is placed on above the waist rail bracket between adjacent pile foundation, high-strength bolt is used
Waist rail is fixed on waist rail bracket；
After slip casting in S11, anchor hole reaches design strength, anchor cable is simultaneously locked on the waist rail by stretch-draw anchor；
S12, the step S5-S11 is repeated, next layer of anchor cable is installed, installation is complete up to all anchor cables；
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 in steel strand wires one end, and from
This one end, which is risen, is disposed alternately at tensioner ring and stirrup ring on the steel strand wires along steel strand wires length direction；The anchor cable includes only
Free segment with steel strand wires and the anchoring section for being provided with the guide head, tensioner ring, stirrup ring, the anchoring section penetrates described
The steel strand wires of anchor hole, the free segment are connect by anchorage with the waist rail.
Wherein, in the step S8, the waist rail is made of bottom plate disposed in parallel and top plate, the bottom plate and top plate
Between the waist rail supporting welding that is made of I-steel two rows connect, inside steel plate is connected with by floor on the top plate,
Outside plate is fitted on the inside steel plate, plane where the outside plate, inside steel plate is each perpendicular to the anchor cable
Length direction；Offer the guiding for wearing the anchor cable successively in the outside plate, inside steel plate, top plate and bottom plate
Hole.
Wherein, the anchor cable is arranged 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) advantageous 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 buries anchor cable below existing roadbed and is stretched in institute by pouring foundation pile in existing roadbed both sides
It states on foundation pile, realizes the supporting to existing roadbed；The present invention uses stake anchoring component, and simple in structure, reasonable design improves
The globality of supporting construction, stress performance are strong；Anchor cable can apply prestressing force, control the deflection of supporting construction, reduce to periphery
The influence of building, and prestressed size and position can adjust as needed；Anchor cable is embedded in the structure below roadbed, supports
Disappeared the lateral pressure of roadbed, and when jacking, clerestory is not required to slope, can vertical cut, increase the space of construction so that jacking is applied
Work is more convenient；Supporting construction is simple, easy for construction, and supporting effect is notable, avoids the hidden danger that roadbed caves in, improves engineering
Safety.
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 in the present invention, anchor cable horizontal layout schematic diagram；
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 of the present invention face figure；
Fig. 7 is waist rail bracket schematic diagram in the present invention.
Wherein, 1, pile foundation；2, Guan Liang；3, waist rail bracket；4, waist rail；4-1, bottom plate；4-2, top plate；4-3, waist rail support；
4-4-1, outside plate；4-4-2, inside steel plate；4-5, pilot hole；4-6, floor；5, 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；6, anchor hole.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
In the description of the present invention, it should be noted that unless otherwise indicated, " more than " range include this number, it is " more
It is a " it is meant that two or more；Term "upper", "lower", "left", "right", "inner", "outside", " front end ", " rear end ", " head ",
The orientation or positional relationship of instructions such as " tail portions " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description originally
Invention and simplified description, do not indicate or imply the indicated device or element must have a particular orientation, with specific side
Position construction and operation, therefore be not considered as limiting the invention.In addition, term " first ", " second ", " third " etc. are only used
In description purpose, it is not understood to indicate or imply relative importance.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " installation ",
" connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally connect
It connects；It can be mechanical connection, can also be electrical connection；It can be directly connected, it can also be indirectly connected through an intermediary.It is right
For those skilled 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, packets
Include following steps：
S1, the position for determining pile foundation made of being perfused by armored concrete：Multiple pile foundations are along existing railway extending direction point
Cloth and be located at existing railway both sides, pile foundation vertical setting 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, casting reinforced concrete retaining wall is to form the space for pouring pile foundation after often section has been dug；Down construct when with
Often section is used as a construction to recycle, that is, pours into a mould concrete guard wall after digging good often section, then excavate next section；It is deep that borehole reaches design mark
After degree, carry out bottom hole processing, accomplish it is smooth, without soft formations such as loose slag, sludge and precipitations；
S3, pile foundation is poured；It is poured in the space surrounded to aforementioned 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 same with existing railway simultaneously
The reinforced concrete continuous beam structure of all pile foundations connection of side；
S5, jacking framed bridge working pit is excavated to first layer anchorage cable design position, from the region between adjacent pile foundation towards both
Have and oliquely downward bores anchor hole on the inside of railway；
S6, it works out, wear anchor cable：Grouting Pipe, stirrup ring, tensioner ring, guiding cap and steel strand wires are connected；Anchor cable has been worked out
Anchor cable one end is penetrated the anchor hole by Cheng Hou, and the anchor cable other end stays 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, waist rail and waist rail bracket are made：Waist rail and bracket are welded using shaped steel；
S9, installation waist rail bracket, expansion bolt is squeezed into pile foundation by design position, with nut by waist rail bracket respectively with
Multiple pile foundation sides；
After S10, waist rail bracket install, waist rail is placed on above the waist rail bracket between adjacent pile foundation, high-strength bolt is used
Waist rail is fixed on waist rail bracket；
After slip casting in S11, anchor hole reaches design strength, anchor cable is simultaneously locked on the waist rail by stretch-draw anchor；
S12, the step S5-S11 is repeated, next layer of anchor cable is installed, installation is complete up to all anchor cables；
S13, the jacking construction for carrying out jacking framed bridge.
The present invention uses stake anchoring component, simple in structure, reasonable design to improve the globality of supporting construction, stress
It 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 position can adjust 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, increase the space of construction so that jacking construction is more convenient；Supporting construction letter
Single, easy for construction, supporting effect is notable, avoids the hidden danger that roadbed caves in, improves engineering safety.
Specifically, in the step S6, when working out the anchor cable, the guide head is arranged in 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 the free segment with steel strand wires and the anchoring section for being provided with the guide head, tensioner ring, stirrup ring, the anchoring section penetrate institute
Anchor hole is stated, the steel strand wires of the free segment are connect by anchorage with the waist rail.
Wherein, in the step S8, the waist rail is made of bottom plate disposed in parallel and top plate, the bottom plate and top plate
Between the waist rail supporting welding that is made of I-steel two rows connect, inside steel is connected with by floor 4-6 on the top plate
Plate, outside plate is fitted on the inside steel plate, and plane where the outside plate, inside steel plate is each perpendicular to the anchor cable
Length direction；It is offered successively in the outside plate, inside steel plate, top plate and bottom plate for wearing leading for the anchor cable
To hole 4-5.Waist rail and bracket use section steel manufacture, shaped steel that plasma cut, welding is used to use manual electric arc welding, pass through experiment
Determine best welding parameter.Design drawing is strictly pressed when waist rail is processed to process, and ensures that the position of each component part of waist rail is accurate, weldering
Connect quality testing qualification.
Preferably, the anchor cable is arranged three layers.
Preferably, in the step S2, it is 1 meter often to save depth.
Preferably, in the step S5, anchor hole is bored using Pneumatic down-hole impact drill.
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 form, and are connected each other between these component parts, influence each other, interact, and 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 diameter and
Stake is long to be determined according to geology and environmental condition by calculating, this example stake diameter is 1.2m, stake spacing 0.6m, and concrete grade adopts
With C30, Reinforcement uses HRB400 grades, and tie hoop often uses HPB300 reinforcing bars.Manual digging pile construction program is:It surveys
Amount setting-out and fixed pile → aperture guard ring pours → 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 → headlamp, ventilation blower, water pump etc. → excavation, handling second saves stake
The hole earthwork → branch dado template → detecting pile foundation center → pours the second section breast wall concrete → cycle operation down successively
→ excavating the base expanding and base expanding portion cubic meter of stone → stake holes of inspecting for acceptance.
Shown in Fig. 1,2,3, stake top described in the present embodiment sets the connection of Guan Liang 2, and stake top Guan Liang 2 is in subgrade protection stake 1
It constructs after the completion of construction, using armored concrete.Stake main reinforcement is required to anchor 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 4,5 structure of anchor cable are set in the present embodiment between stake, 3 rows are set altogether from top to bottom.
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, steel plate to be correspondingly positioned at the pilot hole 4-5 of reserved radius 50mm；Waist rail supports 4-3 to use
I28a I-steel；Waist rail 4 is oriented to anchor slab and is formed using two layers of 20mm iron plate.Waist rail 4 is oriented to anchor slab outside plate 4-4-1 sizes
180×200×20mm；Inside steel plate 4-4-2 sizes are 180 × 320 × 20mm.It is oriented to anchor slab outside plate 4-4-1 reserved half
The pilot hole 4-5 of diameter 50mm, inside steel plate 4-4-2 reserve the pilot hole 4-5 of radius 35mm.It is oriented to anchor slab outside plate 4-4-1
Weld together with inside steel plate 4-4-2, reserving pilot hole 4-5 needs with one heart.After the completion of waist rail 4 welds, 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 inside steel plate 4-4-2 need to be concentric.Waist rail
4 effect is that the concentration prestressed load for generating anchor cable, anchorage evenly spreads to pile foundation 1, then arrives subgrade soil, so as to adjust
Earth stress direction, reinforces roadbed side slope.Waist rail bracket 3 is processed using shaped steel, first bracket 3 by designing position when installation
It sets and is anchored in pile foundation 1, waist rail 4 is provided using screw on 3 top of bracket.
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
At.Anchorage 5-1 is OVM15 anchorages, the reserved injected hole in centre.Grouting Pipe 5-2 is through among steel strand wires 5-3 and is tightened with tied silk, prevents
It falls 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 the plastic tube for going up 20mm is covered on each steel hinge line.Hole depth is anchor cable
Anchoring depth adds free end length, 6 diameter of anchor hole to be not less than 300mm.
It is shown in Figure 6, in the present embodiment the drilling of anchor hole 6 rushed using Pneumatic down-hole after determining anchor cable hole site
It hits churn to drill, when drilling machine is installed, it is necessary to which the angle of stringent control drilling rod and horizontal plane, drilling must use dry
It bores, 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, after drilling reaches depth, surely to bore 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 sundries blowout is waited for, pore-forming inspection is carried out to anchor cable hole again
It looks 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 for lower step process construction.
Shown in Figure 4, the establishment of the present embodiment stream line 5 is a relatively simple working procedure, and 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 uses 3 φ
15.2mm high intensity, underrelaxation steel strand manufacturing, tensile strength must not be less than 1860Mpa.In strict accordance with design drawing when establishment
The components such as Grouting Pipe, stirrup ring, tensioner ring, guiding cap are arranged in paper.
It is shown in Figure 4, in the present embodiment after the completion of anchor cable 5 casts anchor, to avoid deposit in anchor hole from influencing grouting matter
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 are injected by bottom hole, and until slurry is overflow in aperture, 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 the tensioning of anchor cable 5, be locked in anchorage mortar, that anchor pier intensity reaches design is strong
After degree 80%, before anchorage cable stretching construction, representational work anchor cable, hole count is selected to require to be 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 reliability of the reasonability and anchor cable anchor-hold of design is verified, while checking and controlling construction quality.When the formal tensioning of anchor cable, first adopt
Examination drawing is carried out with 10%~20% design tensile load, to anchor cable examination tensioning 1~2 time, keeps its each location contacts close, steel twists
Line is totally straight.Successive loading again, entire stretching process divide Pyatyi carry out loading, i.e., design load 0.25,0.5,0.75,
1.0,1.1 times of tensioning.After every grade of load applies, stablizes observation time and be not less than 10min.If the relative shift of 10min is small
It is to stablize in 1mm, otherwise continues to observe, until after meeting condition of the displacement less than 1mm, anchor cable is locked.Anchor cable locks
Afterwards after 3 days, if finding, prestressd anchor cable is lossy, should be relocked after compensating tensioning.
1, this technology uses stake anchoring component, simple in structure, reasonable design to improve the globality of supporting construction, stress
Performance is strong.
2, anchor cable can apply prestressing force, control the deflection of supporting construction, reduce the influence to surrounding building, and answer in advance
The size and position of power can adjust as needed.
3, due to the use with anchor cable, the lateral pressure of roadbed is counteracted, when jacking, clerestory is not required to slope, can vertically open
It digs, increases the space of construction so that jacking construction is convenient.
4, supporting construction is simple, easy for construction, and supporting effect is notable, the hidden danger for avoiding roadbed from caving in, and improves engineering safety
The construction method of property.
The above is only a 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, several improvement and replacement can also be made, these improve and replace
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, which is characterized in that including
Following steps：
S1, the position for determining pile foundation made of being perfused by armored concrete：Multiple pile foundations along existing railway extending direction be distributed and
Positioned at existing railway both sides, the pile foundation vertical is arranged and positioned at vertical existing railway direction with jacking framed bridge abutment wall outside
At outside 1~2m；
S2, borehole, casting reinforced concrete retaining wall is to form the space for pouring pile foundation after often section has been dug；It is deep that borehole reaches design mark
After degree, bottom hole processing is carried out；
S3, pile foundation is poured；
After S4, pile foundation intensity are up to standard, Guan Liang is poured in the stake top of the pile foundation, the Guan Liang be 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, it works out, wear anchor cable：Grouting Pipe, stirrup ring, tensioner ring, guiding cap and steel strand wires are connected；Anchor cable is worked out
Afterwards, anchor cable one end is penetrated into the anchor hole, the anchor cable other end stays in outside anchor hole；
S7, anchor cable penetrate after immediately to anchor hole slip casting；
S8, waist rail and waist rail bracket are made：Waist rail and waist rail bracket are welded using shaped steel；
S9, installation waist rail bracket, expansion bolt is squeezed into pile foundation by design position, with nut by waist rail bracket respectively with it is multiple
Pile foundation side is fixed；
After S10, waist rail bracket install, 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；
After slip casting in S11, anchor hole reaches design strength, anchor cable is simultaneously locked on the waist rail by stretch-draw anchor；
S12, the step S5-S11 is repeated, next layer of anchor cable is installed, installation is complete up to all anchor cables；
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 described in claim 1,
Be characterized in that, in the step S6, when working out the anchor cable, by the guiding cap be arranged in steel strand wires one end, and from this
It has held and tensioner ring and stirrup ring has been disposed alternately on the steel strand wires along steel strand wires length direction；The anchor cable includes only having
The free segment of steel strand wires and the anchoring section for being provided with the guiding cap, tensioner ring, stirrup ring, the anchoring section penetrate the anchor
The steel strand wires in hole, the free segment are connect by anchorage with the waist rail.
3. the construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process as described in claim 1,
It is characterized in that, in the step S8, the waist rail is made of bottom plate disposed in parallel and top plate, between the bottom plate and top plate
It is connected by the waist rail supporting welding that I-steel is constituted by two rows, inside steel plate is connected with by floor on the top plate, it is described
Outside plate is fitted on the steel plate of inside, plane where the outside plate, inside steel plate is each perpendicular to the length of the anchor cable
Direction；Offer the pilot hole for wearing the anchor cable successively in the outside plate, inside steel plate, top plate and bottom plate.
4. the construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process as described in claim 1,
It is characterized in that, the anchor cable is arranged three layers.
5. the construction method of railway bed supporting in undercrossing tunnel jacking framed bridge jack-in process as described in claim 1,
It is characterized in that, 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 described in claim 1,
It is characterized in that, in the step S5, anchor hole is bored using Pneumatic down-hole impact drill.
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| CN107542096A (en) * | 2017-08-29 | 2018-01-05 | 中国建筑第八工程局有限公司 | The supporting construction of dam body between a kind of Adjacent Pit |
| CN108755446A (en) * | 2018-06-14 | 2018-11-06 | 中国葛洲坝集团第五工程有限公司 | A kind of construction system and construction method of no buttress suspension pouring arch-type bridge |
| CN108867382A (en) * | 2018-06-14 | 2018-11-23 | 张学武 | Anchor system and construction method after prestressing force type |
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