CN102808381B - High-water-level silty-soil underneath-pass multi-track railway frame bridge jacking and butting construction method - Google Patents

High-water-level silty-soil underneath-pass multi-track railway frame bridge jacking and butting construction method Download PDF

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Publication number
CN102808381B
CN102808381B CN201210299359.4A CN201210299359A CN102808381B CN 102808381 B CN102808381 B CN 102808381B CN 201210299359 A CN201210299359 A CN 201210299359A CN 102808381 B CN102808381 B CN 102808381B
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China
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jacking
construction
framework
existing
water level
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CN201210299359.4A
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Chinese (zh)
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CN102808381A (en
Inventor
杨基好
武尊杨
何磊
房瑞泉
陈广彩
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中铁十局集团有限公司
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Priority to CN201210299359.4A priority Critical patent/CN102808381B/en
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Abstract

The invention discloses a high-water-level silty-soil underneath-pass multi-track railway frame bridge jacking and butting construction method. By respectively arranging waterproof curtains at a junction between a newly constructed frame and the existing frame in a direction along lines and in an area of 8 meters beyond the width of the newly constructed frame along a direction perpendicular to the lines, and by arranging a plurality of dewatering wells at intervals between two lines of a newly constructed line along the direction perpendicular to the lines, underground water level is effectively controlled. The lines are reinforced by taking measures of foundation reinforcement by using subgrade support piles, soil body reinforcing piles, existing pier fender piles and temporary beams. During frame jacking construction, jacking accuracy is guaranteed by taking measures such as firstly excavating a groove before earth excavation and then excavating earth from the bottom of the groove to the top of the bottom plate of a frame, jacking a sliding plate for elongation, setting jacking observation points and relieving load at the position of a pier when the sliding plate is jacked to the position of the pier. The high-water-level silty-soil underneath-pass multi-track railway frame bridge jacking and butting construction method has the advantages that the technical problem of great jacking construction difficulty under the situations of high water level, silty soil and multiple underneath-pass tracks is solved, the quantity of tracks of the lines reinforced by temporary beams is decreased and the influence on the lines is reduced.

Description

Under high water level silt geology, wear multiply Railway Frame Bridge jacking docking construction method
Technical field
The present invention relates to wear under a kind of the construction method of wearing multiply railway framework jacking docking under multiply railway framework jacking docking construction method, particularly a kind of high water level silt geology.
Background technology
For wearing multiply railway framework jacking docking construction method under high water level silt geology, traditional sealing, precipitation way are that newly-built framework and existing framework are linked to be to an integral body, water-stop curtain connects all circuits, in whole work progress, just the number of share of stock of beam hardened link is many, large on railways train operation impact, be difficult to guarantee circuit traffic safety; In lower rail wear framework jacking docking construction, need to carry out track strengthening to railway line, general track strengthening adopts the just method of beam of setting up, many for lower rail wear station track, just beam hardened link is the situation in multiply road, conventionally need a large amount of maintenance personnel, and easily cause circuit to change, affect traffic safety; In construction, generally existing bridge pier is taked to soldier pile, in jack-in process, existing pier cap is apart from casing 57cm only, cushion cap easily produces change in displacement, a lot of units in charge of construction take existing bridge pier to increase observation personnel's method when framework jacking, find to change to stop immediately constructing and carry out bridge pier maintenance, but still have some problems, the one, circuit changes may affect traffic safety; The 2nd, send a large amount of maintenance of way personnel, increased construction cost; The 3rd, circuit changes and has stopped construction infection efficiency of construction and duration.
Summary of the invention
For the above-mentioned defect existing in prior art, the invention provides a kind of effectively controlling groundwater level, reduce the construction method of wearing multiply railway framework jacking docking under the high water level silt geology that just beam hardened link, circuit roadbed and bridge pier are stable, jacking precision is high, maintenance of way personnel are few, utilize it can greatly improve construction quality, and reduce construction cost.
The present invention is achieved by the following technical solution: under a kind of high water level silt geology, wear multiply Railway Frame Bridge jacking docking construction method, comprise sealing, dewatering construction, track strengthening construction, framework jacking construction, its special character is, described sealing, dewatering construction comprises: in newly-built framework and existing framework junction along existing line direction and beyond newly-built frame width 8 meters of vertical existing line directions of scope carry out respectively water-stop curtain construction, and between two lines of newly-built circuit, along vertical existing line direction interval, several dewatering wells are set and carry out precipitation, described track strengthening construction comprises: four jiaos of existing frameworks, subgrade support fender pile is set for roadbed supporting, at newly-built framework and existing framework junction, the soil stabilization stake along existing line direction is set, at existing bridge pier, bridge pier fender post is set around, in newly-built frame side, set up just beam, the bar shaped pedestal of described just beam bottom is provided with high-pressure rotary jet grouting pile as substrate reinforcing pile, in described framework jacking construction: before framework jacking is cut the earth, should first at shoveling position, slot, and then the earthwork of pushing up to chassis base at the bottom of box cut, before jacking, be provided for monitoring the observation point of jacking direction, elevation in framework front and back end, jacking slide plate spreading is to jacking rear end in place, while carrying out jacking construction, when framework jacking is when the existing bridge pier place, to, to the unloading of cutting the earth of bridge pier place, after having unloaded, can continue jacking, until new and old framework has docked.
Described subgrade support fender pile is drilled pile.According to on-the-spot geology, meeting under the prerequisite of Construction Technology requirement and quality, select drilled pile, economical rationality, easy construction, and adopt drilled pile can guarantee that in the process of jacking excavation roadbed, circuit keeps stable.
Described soil stabilization stake is high-pressure rotary jet grouting pile.Adopt high-pressure rotary jet grouting pile first by the injection stream of jet grouting pile driving machine mouth, cutting soil also forms whole soil stabilization stake with native mix, can reduce the safe pressure of Business Line construction in work progress, in framework jack-in process, can guarantee subgrade stability.
Described water-stop curtain adopts high-pressure rotary jet grouting pile as water-stop curtain.
Described dewatering well is large open well.Large open well is applicable to the water intaking of Groundwater buried depth is more shallow, aquifer is thinner and permeability is stronger stratum, it have advantages of gather materials on the spot, easy construction.
Described bridge pier fender post is drilled pile.In the situation that meeting standard, quality requirement, adopt drilled pile construction convenient, economical.
For guaranteeing jacking quality, in framework jacking construction, when framework jacking is cut the earth, the length of at every turn cutting the earth is 1.5 meters, and the wide casing 10cm of going out cuts the earth in both sides.
In order to improve jacking precision, in the present invention, in jacking slideway both sides, along jacking direction, be provided with at least one stopping means.
In the present invention, the technical scheme that a kind of track strengthening method in multiply Railway Frame Bridge jacking docking construction of wearing under high water level silt geology adopts is: four jiaos of existing frameworks, subgrade support fender pile is set for roadbed supporting, at newly-built framework and existing framework junction, the soil stabilization stake along line direction is set, at existing bridge pier, bridge pier fender post is set around, in newly-built frame side, set up just beam, the bar shaped pedestal of described just beam bottom is provided with high-pressure rotary jet grouting pile as substrate reinforcing pile.
The invention has the beneficial effects as follows: the present invention, by adopting the mode of water-stop curtain and dewatering well combination, has controlled groundwater table effectively, guaranteed that groundwater table is down to following 1 meter of floor, guaranteed Foundation Treatment Effect.In addition, the present invention is by adopting subgrade support fender pile, soil stabilization stake, existing bridge pier fender post, just beam underpin, framework jacking to methods such as existing bridge pier place's unloadings, guaranteed the stable of circuit roadbed, existing bridge pier, reduced just beam hardened link, thereby reduced maintenance personnel's workload, improve operating efficiency, guaranteed the safety of driving.The inventive method compared with prior art, greatly reduced just beam hardened link, farthest reduced the impact on rail track operation and operation security in work progress, and reduction of erection time greatly, adopt the inventive method construction can shift to an earlier date approximately 1 month duration, greatly reduce construction cost.
Accompanying drawing explanation
Fig. 1 is the floor map in the specific embodiment of the invention;
Fig. 2 is the enlarged diagram of C part in Fig. 1;
Fig. 3 is the enlarged diagram of D part in Fig. 1;
Fig. 4 is the enlarged diagram of E part in Fig. 1;
Fig. 5 is that the A-A of Fig. 1 is to schematic diagram;
Fig. 6 is that the B-B of Fig. 1 is to schematic diagram;
Fig. 7 is jacking and jacking shoveling kerve front and side schematic view;
Fig. 8 is that jacking and bottom land are to base top shoveling front and side schematic view;
Fig. 9 is 55# Bridge Pier and unloading front view;
Figure 10 is 55# Bridge Pier and unloading side view;
Figure 11 is 56# Bridge Pier and unloading front view;
Figure 12 is 56# Bridge Pier and unloading side view;
In figure, 1, water-stop curtain, 2, dewatering well, 3, bar shaped pier, 4, subgrade support fender pile, 5, soil stabilization stake, 6, bridge pier fender post, 7, jacking rear end in place, 8, stopping means, 9, observation point, 10, groove, 11, bottom land is to the earthwork on chassis base top, 12, substrate reinforcing pile, 13, just beam, 14, 55# pier cap, 15, 56# pier cap, 16, the earthwork between 55# pier and fender post, 17, the earthwork between 55# pier and framework, 18, the earthwork between 56# pier and fender post, 19, the earthwork between 56# pier and framework, 20, foundation pit supporting pile, 21, collecting well, 22, anchoring pile, 23, existing bridge pier.
The specific embodiment
Below in conjunction with accompanying drawing and non-limiting embodiment, the present invention is further illustrated:
The present invention be directed to the method for wearing multiply railway framework jacking docking construction under high water level silt geology.As shown in drawings, newly-built framework docks with existing framework, wears the abundant line of Luo, capital nine uplinks, the up interconnection in Fuyang 3 existing railway lines altogether under newly-built frame structure, and distance between centers of tracks is respectively 5.35m, 5.21m.The angle of cut is respectively 82.9 °, 83.2 °, 83.2 °.Frame structure adopts 5.4m+12m+12m+5.4m tetra-hole separate type jacking frameworks, and frame structure oblique is tiltedly done, 82.46 °, the left line of the angle of cut (83.02 °, right line).Newly-built framework and existing framework are directly along connecing, and lateral opening frame structure Cross section Design width is 5.4m; Frame construction is built height 8.7m, frame structure design clear height 7.4m, the actual left line 4.7m of clear height (right line 4.9m) that provides; Top plate thickness 0.6m, base plate thickness 0.7m, sidewall thickness 0.6m.The left line 31m of frame structure length (right line 32.5m).Mesopore Cross section Design width is 12m; Frame construction is built height 8.7m, frame structure design clear height 7.0m, the actual left line 5.9m of clear height (right line 5.9m) that provides; Top plate thickness 0.8m, base plate thickness 0.9m, sidewall thickness 0.8m.The left line 45m of frame structure length (right line 46.5m).
The mode jacking docking construction that the present invention takes sealing, precipitation system+track strengthening system+framework jacking system to combine.Its sealing, precipitation system comprise: in newly-built framework and existing framework junction along existing line direction and beyond newly-built frame width 8 meters of vertical existing line directions of scope carry out respectively water-stop curtain 1 construction, and between two lines of newly-built circuit, along vertical existing line direction interval, several dewatering wells 2 are set and carry out precipitation, sealing, precipitation are closed in aggregates, realized the requirement of water level being down to following 1 meter of floor.In the present embodiment, water-stop curtain 1 adopts high-pressure rotary jet grouting pile as water-stop curtain, and dewatering well adopts large open well.Track strengthening system comprises: four jiaos of existing frameworks by drilled pile as subgrade support fender pile 4, for roadbed supporting, at newly-built framework and existing framework junction, along existing line direction, carry out Construction of High Pressure Jet Grouting Pile as soil stabilization stake 5, realized the requirement that reduces subgrade stability when just the object of beam hardened link meets framework jacking.Meanwhile, at existing bridge pier 23 around by drilled pile as existing bridge pier fender post 6.In newly-built frame side, set up just beam 13, bar shaped pier 3 bottoms of described just beam 13 bottoms are provided with high-pressure rotary jet grouting pile as substrate reinforcing pile 12.During construction, first by set up D16 type just beam 13 carry out bar shaped pier 3 foundation excavations, after bar shaped pier 3 foundation excavations complete, then carry out 3 constructions of 3 times Construction of High Pressure Jet Grouting Piles of bar shaped pier and bar shaped pier.By dividing at just beam, put high-pressure rotary jet grouting pile and solved the just requirement of beam base fixed.In framework jacking construction: adopt kerve formula excavation when framework jacking is cut the earth, before framework jacking is cut the earth, should first at shoveling position, slot 10, and then the earthwork 11 of pushing up to chassis base at the bottom of box cut, the both sides wide casing 10cm of going out that cuts the earth, the length of at every turn cutting the earth is 1.5 meters.Before jacking, be provided for monitoring the observation point 9 of jacking direction, elevation in framework front and back end, jacking slide plate spreading, to jacking rear end 7 in place, guarantees that in framework center of gravity, departing from slide plate front baffle front end pushed up circuit.In jacking construction, when framework jacking is when existing bridge pier 23 place, be to the unloading of cutting the earth of bridge pier place, respectively between the pier of bridge pier and fender post cubic metre of earth and between pier and framework cubic metre of earth is dug out, unload, after having unloaded, can continue jacking, until new and old framework has docked.In jacking construction, by bridge pier place is unloaded, realized the stable requirement of existing bridge pier.
Specific implementation process of the present invention is as follows: carry report go slowly a plan → water-stop curtain, dewatering well construction → soil stabilization, subgrade support fender pile construction → destressing construct → just construction → the vertical shift of erection → bar base just beam → framework try top → jacking shoveling → framework jacking → Construction of Transition Section → traversing just beam → more renew three type bridge ties recovery circuits.
Other parts in the present invention adopt prior art, do not repeat them here.
Above-described embodiment is only with the explanation of the present invention of opposing; not in order to limit the present invention; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.

Claims (8)

1. under a high water level silt geology, wear multiply Railway Frame Bridge jacking docking construction method, comprise sealing, dewatering construction, track strengthening construction, framework jacking construction, it is characterized in that: described sealing, dewatering construction comprise: in newly-built framework and existing framework junction along existing line direction and beyond newly-built frame width 8 meters of vertical existing line directions of scope carry out respectively water-stop curtain (1) construction, and between two lines of newly-built circuit, along vertical existing line direction interval, several dewatering wells (2) are set and carry out precipitation; Described track strengthening construction comprises: four jiaos of existing frameworks, subgrade support fender pile (4) is set for roadbed supporting, at newly-built framework and existing framework junction, the soil stabilization stake (5) along existing line direction is set, at existing bridge pier, bridge pier fender post (6) is set around, in newly-built frame side, set up just beam (13), bar shaped pier (3) bottom of described just beam (13) bottom is provided with high-pressure rotary jet grouting pile as substrate reinforcing pile (12); In described framework jacking construction: before framework jacking is cut the earth, should be first at shoveling position fluting (10), and then the earthwork (11) of pushing up to chassis base at the bottom of box cut, before jacking, in framework front and back end, be provided for monitoring the observation point (9) of jacking direction, elevation, jacking slide plate spreading is to jacking rear end in place (7), while carrying out jacking construction, when framework jacking is when the existing bridge pier place, will be to the unloading of cutting the earth of bridge pier place, after having unloaded, can continue jacking, until new and old framework has docked.
2. under high water level silt geology according to claim 1, wear multiply Railway Frame Bridge jacking docking construction method, it is characterized in that: described subgrade support fender pile (4) is drilled pile.
3. under high water level silt geology according to claim 1, wear multiply Railway Frame Bridge jacking docking construction method, it is characterized in that: described soil stabilization stake (5) is high-pressure rotary jet grouting pile.
4. under high water level silt geology according to claim 1, wear multiply Railway Frame Bridge jacking docking construction method, it is characterized in that: described water-stop curtain (1) adopts high-pressure rotary jet grouting pile as water-stop curtain.
5. under high water level silt geology according to claim 1, wear multiply Railway Frame Bridge jacking docking construction method, it is characterized in that: described dewatering well (2) is large open well.
6. under high water level silt geology according to claim 1, wear multiply Railway Frame Bridge jacking docking construction method, it is characterized in that: described bridge pier fender post (6) is drilled pile.
7. under high water level silt geology according to claim 1, wear multiply Railway Frame Bridge jacking docking construction method, it is characterized in that: in framework jacking construction, when framework jacking is cut the earth, the length of at every turn cutting the earth is 1.5 meters, the wide casing 10cm of going out cuts the earth in both sides.
8. under high water level silt geology according to claim 1, wear multiply Railway Frame Bridge jacking docking construction method, it is characterized in that: in jacking slideway both sides, along jacking direction, be provided with at least one stopping means (8).
CN201210299359.4A 2012-08-21 2012-08-21 High-water-level silty-soil underneath-pass multi-track railway frame bridge jacking and butting construction method CN102808381B (en)

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