CN101963061B - Construction method for underground box culvert of existing railway line - Google Patents

Construction method for underground box culvert of existing railway line Download PDF

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Publication number
CN101963061B
CN101963061B CN2010105115535A CN201010511553A CN101963061B CN 101963061 B CN101963061 B CN 101963061B CN 2010105115535 A CN2010105115535 A CN 2010105115535A CN 201010511553 A CN201010511553 A CN 201010511553A CN 101963061 B CN101963061 B CN 101963061B
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box culvert
jacking
railway
construction
line
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CN2010105115535A
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Chinese (zh)
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CN101963061A (en
Inventor
金振
饶益民
钟将
钱昀
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浙江省建工集团有限责任公司
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Abstract

The invention relates to a construction method for an underground box culvert of an existing railway line which is characterized in that a first-dig last-push construction method is adopted; a temporary beam foundation is firstly constructed and a working pit is dug; a D-shaped temporary beam and a cross beam are erected to reinforce the existing railway line; a foundation pit on the jacking section is dug; the box culvert prefabricated in the working pit is integrally jacked by utilizing a hydraulic jack for the back constructed in advance; and the displacement of the box culvert is controlled by a positioning beam. The invention solves the construction difficulties in the prior art, overcomes the phenomena of head raise, head stab, over head and the like of the box culvert during jacking construction, has the advantages of great technical superiority, line safety guarantee and construction speed acceleration, and is suitable for the box culvert construction of underpasses, bridges and culverts of the existing railway underpass line on railway.

Description

The job practices of the underground box culvert of a kind of railway existing line

Technical field

The invention belongs to the realm of building construction, the job practices of the underground box culvert of particularly a kind of railway existing line.

Background technology

Along with the investment construction of country's increasing to infrastructure, large quantities of railway engineerings need the rebuilding and expansion of the of the existing enterprises.Wear existing railway line under underground passage in railway rebuilding and expansion of the of the existing enterprises process (containing tunnel, turnover station, the row bag tunnel etc.) needs, but can not influence the normal operation of railway again, and underground passage also needs the waterproofing course of construction outer wall and end face.Because circuit is normally runed, train is current as usual, and circuit can not be removed.

Genuine box culvert end face is too near with the distance of rail circuit during conventional cast-in-place method construction, the top line of normal operation is caused great potential safety hazard, and the following engineering time of line is long, is unfavorable for foundation ditch safety, and cast-in-place method construction is not suitable for existing line and constructs.

The conventional jacking of the railway existing line main employing of underground box culvert construction at present.The common way of conventional jacking is to reinforce existing line earlier, directly will borrow the back that constructs in advance to put in place with the jacking of cluster hydraulic jack by the prefabricated box culvert of finishing in working pit then.There is following defective in the conventional jacking that adopts:

1, very easily run into uncertain underground cable in the existing line scope during conventional pipe jacking method, influence jacking construction, cable security is difficult for guaranteeing.

2, conventional jacking can't be provided with slide plate in the jacking section, easily produces in the jacking construction to come back and a bundle phenomenon.

3, conventional jacking can't be provided with slide plate in the jacking section, and the box culvert bottom soil body easily produces big sedimentation in the jack-in process, influences the absolute altitude of box culvert.

4, conventional jacking can't be provided with positioning beam, easily produces the top phenomenon when jacking construction, wayward its displacement.

5, conventional jacking directly heads into box culvert in the soil, and waterproofing course is pushed by the soil body in jack-in process, easily is damaged and can't repairs.

6, conventional jacking adopts the method construction on the top while digging, and the box culvert periphery soil body is disturbed during jacking, and existing line is produced very big potential safety hazard.

Therefore, press for to seek and a kind ofly can guarantee existing railway line safety, again box culvert job practices efficiently at the underground passage work progress.

Summary of the invention

In order to overcome the above-mentioned defective of existing box culvert job practices, the invention provides the job practices of the underground box culvert of a kind of railway existing line, not only can guarantee construction safety and workmanship, and speed of application is very fast.

The job practices of the underground box culvert of a kind of railway existing line is characterized in that may further comprise the steps:

⑴ build just beam basis of D type, excavates working pit simultaneously;

⑵ be provided with bed course, slide plate and separation layer in working pit;

⑶ by the underground box culvert of designing requirement prefabricated reinforced concrete, pushing up pick and box culvert contact site pre-embedded steel slab in working pit;

⑷ be provided with back and back beam;

⑸ reinforce the railway existing line: set up just beam of D type in the railway line both sides, set up crossbeam again, make the just beam connection of crossbeam and D type, rail and crossbeam are connect, place insulating pad between rail and the crossbeam;

⑹ carry out the artificial trial trench in jacking segment base hole, carries out the large tracts of land soil excavation again;

⑺ bed course, slide plate, guiding pier, positioning beam and the separation layer of jacking section after putting in place, soil excavation are set immediately;

⑻ carry out top power and calculate and install jack jacking equipment;

⑼ the whole pipe jacking method of employing jack, the stroke in examination top carries out formal jacking after also meeting the requirements after testing more earlier, rectifies a deviation at any time in the jack-in process;

⑽ carry out backfilling of earthwork and compacting to its both sides and top after the box culvert jacking puts in place, and carry out railway bed and fill with the jacking displacement of positioning beam control box culvert, and ballast aggregate is gone up in qualified after testing back;

⑾ remove just beam of D type, adjusts sleeper pitch synchronously, on be cut, make firm by ramming and do;

⑿ check rail track gauge, level, direction and the fastening situation of sleeper fastening, recovers circuit.

Preferably, the D type in the step 1 just beam basis is cross section 1.25 * 1.25m rectangular opening stake, concrete strength C25.

Preferably, the separation layer way in the step 2 is as follows: the 1:1.5 heating by volume of used oil and French chalk is mixed well, and has watered and has sprinkled the thick French chalk of one deck 0.2~1mm after solidifying, French chalk upper berth layer of plastic film.Separation layer can prevent that prefabricated box culvert body base plate and working pit slide plate from boning mutually, reduces the jacking resistance.

Preferably, the pre-embedded steel slab in the step 3 is that thickness is the steel plate of 10mm.

Preferably, the back in the step 4 adopts M10 to grout schist.Back is positioned at the working pit rear portion, the supporting surface of jack when being jacking construction, the horizontal reacting force when bearing jacking.Adopt M10 to grout schist and have certain rigidity as back, compressive strain is as far as possible little; Have enough intensity and stability, reason top power is not caved in greatly.

In the jacking construction of box culvert,, must before the jacking operation, reinforce existing line for guaranteeing by the traffic safety of jacking circuit and construction safety.Preferably, the just beam just beam of D type that adopts 12m or 24m according to the box culvert width of the D type in the step 5.

Preferably, the insulating pad in the step 5 adopts the special U type backing plate of neoprene, and thickness is 20mm.

Preferably, the trial trench cutting depth in the step 6 is 1.5~2.0m.

Preferably, guiding pier in the step 7 adopts the C30 steel bar concrete to make, and cross dimensions is 250 * 250mm, exceeds slide plate 30cm, with the distance of box culvert both sides be 10~15cm, guiding pier arrangement of reinforcement is 4 Φ 16, stirrup is φ 8@150.

Preferably, it is 250 * 300mm, main muscle for 2 Φ 14, stirrup up and down are the C30 reinforced concrete beam of φ 6@200 that positioning beam in the step 7 adopts section, is arranged at the end of jacking section, and the position of being close to underground box culvert design attitude.

Preferably, the jack in the step 8 is installed in the bottom of box culvert, presses box culvert axis symmetric arrangement, and top iron, the force-transmitting pole of power transmission equipment are consistent with the top line of force, and perpendicular to the back beam.

The inventive method is for digging the jacking on top more earlier, reinforce existing line earlier, carry out the excavation in jacking segment base hole then, and slide plate, guiding pier and the positioning beam of construction jacking section, will in working pit, borrow the back that constructs in advance to put in place by the prefabricated box culvert of finishing again with the jacking of cluster hydraulic jack.By reinforcing existing line, excavate the foundation ditch of jacking section then, the slide plate of on the foundation ditch bottom surface of jacking section, constructing, guiding pier and positioning beam.The slide plate of construction is the slide surface of underground box culvert jacking, and the place ahead does not have the soil body to stop during jacking, is again the good slide plate of greasy property below, and resistance reduces greatly during jacking, and move speed is accelerated greatly; On the other hand owing to be provided with solid slide plate, underground box culvert is close to slide plate and is slided during jacking, can not leave slide plate and produces and come back and prick first-class phenomenon.Owing to be provided with concrete guiding pier in the slide plate both sides, can restrictedly descend the displacement of the box culvert left and right sides.Be provided with the steel concrete positioning beam in the direction of advance of jacking according to the design attitude of box culvert, it is excessive to guarantee that box culvert can not push up.Because underground box culvert both sides and top do not have the soil body during jacking, the quality of underground waterproof construction guarantees easily, has avoided the influence that waterproofing course is pushed by the soil body in the jack-in process.Owing to excavate the pit earthwork of jacking section in advance, make the underground cable in the jacking segment limit all exposed, there is not the underground uncertain factor that cable influences jacking construction of secretly burying, guarantee cable security easilier.

And conventional jacking of the prior art is to reinforce existing line earlier, does not carry out the excavation in jacking segment base hole, directly will borrow the back that constructs in advance to put in place with the jacking of cluster hydraulic jack by the prefabricated box culvert of finishing in working pit.Because conventional jacking does not excavate the pit earthwork of jacking section in advance, there are more problem in the slide plate of also just can't constructing, guiding pier and positioning beam.

The present invention adopts and to dig the job practices of afterwards push up earlier, has solved the construction difficult problem that exists in the prior art, when having overcome jacking construction box culvert come back, prick head with phenomenons such as top, have very big technical advantage, guarantee line security, the quickening speed of application.Be applicable to down the box culvert construction of underground passage, bridge and the culvert of rail wear existing line.

The present invention has following technique effect:

The slide plate of 1. jacking section has reduced the resistance of jacking.

2. can not produce and come back and a bundle phenomenon.

3. because guiding pier and positioning beam are arranged, the position of jacking is easy to control.

4. the quality of waterproof construction guarantees easily, has avoided the influence that waterproofing course is pushed by the soil body in the jack-in process.

5. the underground cable in the existing line scope can not influence jacking construction, guarantees cable security easilier.

6. speed of application is very fast.

For further specifying design feature of the present invention and effect, the present invention is further described below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is that floor map is contained in jacking.

Fig. 2 is that elevational schematic view is contained in jacking.

Fig. 3 is that just beam is reinforced sectional drawing.

The specific embodiment

As Fig. 1 ~ shown in Figure 3, the job practices of the underground box culvert of railway existing line specifically may further comprise the steps:

1, excavate the earthwork on just beam basis for 1 time and establish retaining wall at the railway existing line, place reinforcing cage 2, the construction cross section is the rectangular opening stake of 1.25 * 1.25m, and concrete strength is C25, excavates working pit simultaneously.Working pit adopts soil nailing wall or other support form to carry out open-cut.Is more than the 1.5m near excavation sideline, existing line side group hole apart from existing roadbed curb safe distance.

2, bed course 7, slide plate 8 are set in working pit.Construction separation layer 9 on slide plate.The separation layer way is as follows: used oil and French chalk 1:1.5 heating are by volume mixed well, and have watered the French chalk that sprinkles after solidifying behind one deck 0.2~1mm, the upper berth layer of plastic film.

3, in working pit, press the underground box culvert 3 of designing requirement prefabricated reinforced concrete, and carry out maintenance, by designing requirement construction waterproof layer.Cracked for preventing to contain concrete at the jack-in process middle frame, at top pick and the pre-buried 10mm steel plate in box culvert contact site.

4, back 4 and back beam are set, back adopts M10 to grout schist, and its size is calculated by coulomb theory method and determined that back has enough Qiang Du ﹑ rigidity and stability, reaches safe and reliable and is convenient to and remove.

5, the railway existing line is reinforced: set up just beam 5 of D type in the railway line both sides, set up crossbeam 6 again, make the just beam connection of crossbeam and D type, rail and crossbeam are connect, placing thickness between rail and the crossbeam is the special U type of the rubber insulating pad of 20mm.The D type is the beam just beam of D type that adopts 24m according to the box culvert width just.

6, carry out the artificial trial trench in jacking segment base hole, trial trench cutting depth 1.5~2.0m carries out the large tracts of land soil excavation after trial trench finishes.

Bed course, slide plate, guiding pier 10, positioning beam 11 and the separation layer of jacking section are set after 7, soil excavation puts in place immediately.The guiding pier adopts the C30 steel bar concrete to make, and exceeds slide plate 30cm, with the distance of box culvert both sides be 10~15cm, guiding pier arrangement of reinforcement is 4 Φ 16, stirrup is φ 8@150.It is 250 * 300mm, main muscle for 2 Φ 14, stirrup up and down are the C30 reinforced concrete beam of φ 6@200 that positioning beam adopts section, the position that is arranged at the end of jacking section, is close to underground box culvert design attitude.

8, according to top power size jacking equipment such as jack 12 are installed.Jack is installed in the bottom of box culvert, presses box culvert axis symmetric arrangement.Top iron 13, the force-transmitting pole 14 of power transmission equipment are consistent with the top line of force, and perpendicular to the back beam.The model that jack adopts many group 320T jack to cooperate Tianjin prestige sickle seamless steel pipe Co., Ltd to produce is the high pressure axial plunger pump station of BZ31.5 MPa-25.

9, adopt the whole pipe jacking method of hydraulic jack, earlier the examination stroke in top and meet the requirements after carry out formal jacking again, rectify a deviation at any time in the jack-in process.

10, with the jacking displacement of positioning beam 11 control box culverts, after the box culvert jacking puts in place backfilling of earthwork and compacting to be carried out in its both sides and top, and carry out railway bed and fill, ballast aggregate is gone up in qualified after testing back;

11, remove just beam of D type, adjust sleeper pitch synchronously, on be cut, make firm by ramming and do.

12, recover circuit, before line clear, check circuit gauge, level, direction and the fastening situation of sleeper fastening.

In the work progress of the underground box culvert of railway existing line, should note quality and safety control, be described in detail as follows:

When placing slide plate concrete, imbed with the steel bar end of Ф 16 and to be divided into 2m grid control elevation in the concrete, by a some levelling, use the 1:3 cement sand plaster again, guarantee the planeness on surface.The guiding pier of every side must be on same straight line, with control box culvert jacking direction.Box culvert base plate pre-embedded bolt is in order to the fixing force transfer post.

Before the jacking box culvert agent structure, each physical dimension of back, track strengthening are inspected for acceptance, concrete strength adheres to specification.Box culvert is selected suitable jacking equipment according to size, weight and the jacking length of box culvert before jacking.Air-pressure equipment carries out Installation and Debugging, works well.

Start to from box culvert that box culvert is in place to accomplish without any letup.In the jack-in process, at any time back, force-transmitting pole are checked, found that back tilts or gross distortion, the fore-set phenomenon that is distorted stops jacking immediately, continues jacking again after handling rapidly.

The special messenger is set in the jack-in process at any time box culvert direction, absolute altitude is observed, the discovery deviation is in time rectified a deviation, and mainly takes to increase and decrease the mode of a side top power.Guarantee that box culvert direction, absolute altitude are controlled at standard and fill perhaps in the deviation range.

Establish 2 full-time security officials during jacking and be responsible for job site construction safety protection work.Liaison man in the station is established at the station, and the line signal label is established two protection persons and guarded.Unified operation command signal performs observation and prepares.

After the casing jacking puts in place, organize manpower backfill casing both sides and top filler.By designing requirement back-filling in layers compaction in layers.Case body two ends are filled and must symmetry be carried out, and adopt battering ram to carry out Local treatment.After roadbed filling was finished, ballast aggregate was gone up in qualified after testing back.

Before the line clear, check circuit gauge, level, direction and the fastening situation of sleeper fastening etc.The rail material of pulling down is put into away from place on line, and pile is neat.Sleeper, U type card and the fastening bolts of removing etc. are in time regained.

Claims (8)

1. the job practices of the underground box culvert of railway existing line is characterized in that may further comprise the steps:
⑴ build just beam basis of D type, excavates working pit simultaneously;
⑵ be provided with bed course, slide plate and separation layer in working pit;
⑶ by the underground box culvert of designing requirement prefabricated reinforced concrete, pushing up pick and box culvert contact site pre-embedded steel slab in working pit;
⑷ be provided with back and back beam;
⑸ reinforce the railway existing line: set up just beam of D type in the railway line both sides, set up crossbeam again, make the just beam connection of crossbeam and D type, rail and crossbeam are connect, place insulating pad between rail and the crossbeam;
⑹ carry out the artificial trial trench in jacking segment base hole, carries out the large tracts of land soil excavation again;
⑺ bed course, slide plate, guiding pier, positioning beam and the separation layer of jacking section after putting in place, soil excavation are set immediately;
⑻ carry out top power and calculate and install jack jacking equipment;
⑼ the whole pipe jacking method of employing jack, the stroke in examination top carries out formal jacking after also meeting the requirements after testing more earlier, rectifies a deviation at any time in the jack-in process;
⑽ carry out backfilling of earthwork and compacting to its both sides and top after the box culvert jacking puts in place, and carry out railway bed and fill with the jacking displacement of positioning beam control box culvert, and ballast aggregate is gone up in qualified after testing back;
⑾ remove just beam of D type, adjusts sleeper pitch synchronously, on be cut, make firm by ramming and do;
⑿ check rail track gauge, level, direction and the fastening situation of sleeper fastening, recovers circuit.
2. the job practices of the underground box culvert of railway existing line according to claim 1 is characterized in that, the D type in the step 1 just beam basis is cross section 1.25 * 1.25m rectangular opening stake, concrete strength C25.
3. the job practices of the underground box culvert of railway existing line according to claim 1, it is characterized in that, separation layer way in the step 2 is: the 1:1.5 heating by volume of used oil and French chalk is mixed well, watered and sprinkled the thick French chalk of one deck 0.2~1mm after solidifying, French chalk upper berth layer of plastic film.
4. the job practices of the underground box culvert of railway existing line according to claim 1 is characterized in that, the pre-embedded steel slab in the step 3 is that thickness is the steel plate of 10mm.
5. the job practices of the underground box culvert of railway existing line according to claim 1 is characterized in that, the back in the step 4 adopts M10 to grout schist.
6. the job practices of the underground box culvert of railway existing line according to claim 1 is characterized in that, the D type in the step 5 is the beam just beam of D type that adopts 12m or 24m according to the box culvert width just.
7. the job practices of the underground box culvert of railway existing line according to claim 1 is characterized in that the trial trench cutting depth in the step 6 is 1.5~2.0m.
8. the job practices of the underground box culvert of railway existing line according to claim 1, it is characterized in that the jack in the step 8 is installed in the bottom of box culvert, press box culvert axis symmetric arrangement, top iron, the force-transmitting pole of power transmission equipment are consistent with the top line of force, and perpendicular to the back beam.
CN2010105115535A 2010-10-19 2010-10-19 Construction method for underground box culvert of existing railway line CN101963061B (en)

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