CN113217002A - Construction method for jacking side position of existing line crossing in frame culvert point - Google Patents
Construction method for jacking side position of existing line crossing in frame culvert point Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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Abstract
The invention relates to the technical field of railway construction, in particular to a construction method for jacking a side position crossing an existing line in a frame culvert point; the construction method comprises the following steps of (1) constructing a manual hole digging protection pile; (2) dismantling the plate girder and the bridge deck attachment; (3) changing the road; (4) constructing a steel sheet pile; (5) excavating a foundation pit; (6) dismantling the splayed wall and the baffle; (7) manufacturing a sliding plate, an anchor beam, a guide pier, a sliding layer and a back; (8) prefabricating a frame culvert; (9) jacking the frame culvert; (10) restoring the retaining wall; (11) backfilling a foundation pit; (12) auxiliary engineering and pavement restoration; the method of the invention has minimal impact on railway transportation. The method has the advantages of practicability, convenient operation and low construction cost. The safety risk is reduced, and the driving safety is ensured. The prefabricated frame culvert is far away from the existing line and has small interference to driving. The working efficiency is improved, the construction progress is accelerated, and the construction period is shortened. The prefabricated frame culvert does not need key point construction, and the construction progress is independently controllable. Meanwhile, the protective measures for the existing lines are correspondingly less, and the investment is saved.
Description
Technical Field
The invention relates to the technical field of railway construction, in particular to a construction method for jacking a side position crossing an existing line in a frame culvert point.
Background
In the reconstruction construction of the existing station yard, the common construction method for lengthening the frame culvert of the existing railway comprises the following steps: and (5) sealing the existing line for cast-in-place construction. The method has long time for closing the existing railway, has larger influence on railway transportation, and is generally suitable for sections with smaller transportation volume or small influence on the railway transportation, so the construction method for lengthening the railway frame culvert brings great inconvenience to the railway transportation; there is a need for a safe, convenient and economical construction method that has little impact on railway transportation.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a construction method for jacking the side position of the existing line crossing in the frame culvert point.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a construction method for jacking a side position of an existing line crossing inside a frame culvert point comprises the following steps of (1) manually digging a hole and protecting a pile for construction; (2) dismantling the plate girder and the bridge deck attachment; (3) changing the road; (4) constructing a steel sheet pile; (5) excavating a foundation pit; (6) dismantling the splayed wall and the baffle; (7) manufacturing a sliding plate, an anchor beam, a guide pier, a sliding layer and a back; (8) prefabricating a frame culvert; (9) jacking the frame culvert; (10) restoring the retaining wall; (11) backfilling a foundation pit; (12) auxiliary engineering and pavement restoration, characterized in that, the frame culvert jacking of (9) includes the following steps:
a. removing the line and the contact network cable, removing the line, opening the joint and removing the sleeper according to the jacking position;
b. chiseling the bottom plate of the U-shaped groove by adopting an excavator matched with a cannon hammer;
c. after the U-shaped groove is chiseled, leveling the original ground, and paving a sliding rail which is connected with the sliding rail at the top of the sliding plate;
d. the frame constructs the top and advances, chooses 500t hydraulic jack, top iron for use: setting top irons with the top ranges of 50cm, 1m, 2m and 4m, wherein when the top irons are placed, the direction of top iron top columns is consistent with the axis of a jacking force, and the supporting surfaces are required to be closely attached; in order to transmit the acting force of the jack to the back and the box body, a beam is respectively arranged between the back and the top iron and between the box body bottom plate and the jack; the beam is horizontally placed by an upper layer and a lower layer of two I-shaped steels with the thickness not less than I500 multiplied by 200mm, and the upper layer I-shaped steel and the lower layer I-shaped steel are welded together by reinforcing steel bars; in order to keep the stability of the jacking iron, a jacking column cross beam which is welded by two I-shaped steels not smaller than I500 x 200mm is arranged every 4-8 m and is arranged in a fixed section which is changed into a long jacking column;
e. restoring the line and contacting the network cable, loading the ballast in advance in the frame culvert, placing sleepers, connecting the line after jacking in place, and repairing the ballast and tamping drum.
Compared with the prior art, the invention has the following beneficial effects:
the method of the invention has minimal impact on railway transportation. The construction of chiseling the existing retaining wall and the splayed wall in the early stage can be carried out by utilizing the railway skylight for 3 hours every day. And the jacking process only needs to be stopped and wired for 24 hours.
The method has the advantages of practicability, convenient operation and low construction cost.
The safety risk is reduced, and the driving safety is ensured. The prefabricated frame culvert is far away from the existing line and has small interference to driving.
The working efficiency is improved, the construction progress is accelerated, the construction period is shortened, and the economic benefit and the social benefit are remarkable. The prefabricated frame culvert does not need key point construction, and the construction progress is independently controllable. Meanwhile, the protective measures for the existing lines are correspondingly less, and the investment is saved.
Drawings
Fig. 1 is a schematic view of the construction of a fender pile according to embodiment 1.
Fig. 2 is a schematic view showing the longitudinal arrangement of the guide piers according to example 1.
Fig. 3 is a schematic diagram of frame culvert prefabrication.
The figures are labeled as follows:
1-protective pile, 2-existing machine 2-line, 3-steel sheet pile, 4-guide pier, 5-anchor beam and 6-slide plate.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
In the embodiment, the elm secondary station energy expansion transformation project DL9K0+ 384.61-6 m frame culvert lengthening construction is taken as an example, and the construction method is adopted to carry out jacking construction crossing the existing line side position in the frame culvert point.
DL9K0+384.60 has the net height of 1-5m culvert 6m, the indoor machine in station runs 2 lines through the culvert, if cast-in-place construction is adopted, the machine needs to be stopped and run 2 lines for 60 days, and the influence on transportation is large. And combining field practice, the rear side of the frame culvert needs to be jacked in the north side of the machine walking 2 lines.
The culvert lengthening adopts a 1-6m frame culvert, the jacking length is 11m, the jacking distance is 8.5m, the jacking section adopts a hole digging pile and a steel sheet pile to protect the existing roadbed, the contact network cable is changed in point, the circuit is dismantled, a U-shaped groove concrete bottom plate is chiseled, and the circuit and the contact network cable are recovered after jacking in place.
The principle is as follows: and prefabricating the lateral position of the frame culvert, and jacking in the point. Firstly, carrying out manual hole digging protective pile construction on the west side of a foundation pit, dismantling an enclosure of a compartment of the elm-woven line, changing a temporary road, and driving a steel plate protective pile on the north side of the foundation pit. Chiseling out the concrete pavement of the existing 1-13m plate girder and the concrete pavement of the roads on the two sides, and dismantling the auxiliary structures such as the anti-throwing net on the plate girder. And (3) hoisting the existing 1-13m plate beam by using a 200t crane through a III-level blocking point. And then, carrying out foundation pit excavation operation, arranging a soil discharging channel on the east side of the foundation pit, and chiseling the existing splayed wall and the retaining walls on the two sides of the existing mechanical walking 2 line by utilizing a III-level blocking point. And secondly, constructing a sliding plate, a guide pier, an anchor beam and the like. After the frame culvert is prefabricated, the machine-walking 2 lines are dismantled by using a III-level locking point (24 h), the frame culvert is jacked in place, and the lines are recovered. And then carrying out foundation pit backfilling, retaining wall restoration, 1-13m plate beams, existing concrete roads and other constructions.
The method specifically comprises the following steps:
1. construction of manual hole digging protective pile
As shown in figure 1, the jacking section is provided with a manual hole digging protective pile on the left side of the machine walking 2 line and on the west side of the foundation pit. The diameter of the manual hole digging pile is 1.25m, the length of the pile is 16m, and the distance between the pile and the manual hole digging pile is 2 m. The hole is formed by adopting a mode of manually mixing a concrete retaining wall for pouring and manually rolling the soil. And binding the main body steel bars of the hole digging pile in sections in the hole, and pouring concrete by using a ground pump. And calculating according to the designed geological data, wherein the underground water level is positioned at the position 6m below the rail surface, and the water pump is adopted to pump water below 12.81m to perform precipitation in the hole. Adopting a mode of separating pile excavation to excavate.
2. Demolish board roof beam and bridge floor and attach
a. And (3) manually dismantling the existing heat supply pipeline and pipeline support at the 1-13m plate beam by using the adjacent class C plan. Chiseling 1-13m plate beam concrete pavement and concrete surfaces of roads on two sides of the concrete pavement by using a small hammer machine, and removing auxiliary structures such as anti-throwing nets on the plate beams.
b. And stopping the machine for 2 lines and 180 minutes by using a III-grade sealing point seal, and removing 1-13m of the existing plate beam in the point. The single plate beam is 25t, the total number of the single plate beam is two, and the single plate beam is hoisted twice by a 200t crane.
3. Road changing
A1-6 m frame culvert foundation pit is positioned on the south side of the elm-woven line workshop, and an existing road needs to be changed before excavation of the foundation pit. The newly-built sidewalk is located on the outer side of the elm-woven line garage, and a 43m temporary manshaped sidewalk needs to be built by removing the existing enclosing wall. The width of the temporary shifted road is 2.5-4m, the front and the back of the temporary shifted road are connected with the existing road, and the road surface is paved with 0.2m thick gravels. The outer side of the access road is provided with a color steel plate for isolation. The road junction is provided with an anti-collision sand pier, and the color steel plate is provided with a reflective strip, a warning mark and an indicating mark.
4. Construction of steel sheet pile
The north side of the foundation pit is protected by Larsen steel sheet piles, and the length of each steel sheet pile is 15 m. And (5) adopting a vibration pile pressing method for construction.
Secondly, when the pile driver presses the pile, the center line of the pile cap and the pile body must be superposed.
And secondly, checking the perpendicularity of the pile body at any time in the pile pressing process, finding that the pile body suddenly inclines and equipment reaches rated pressure for 20min in the processes of displacement, inclination and pressing-in of the pile body in the initial pressing process, and pulling out the pile body to be newly driven when the pile body still cannot sink.
Before vibrating the pile, the pile clamp of the vibration hammer should clamp the upper end of the steel pile, and the vibration hammer and the center of gravity of the steel pile are on the same straight line.
Fourthly, the steel pile is clamped by a vibration hammer to be hoisted, so that the steel sheet pile is vertically positioned or the locking opening of the steel sheet pile is inserted into the locking opening of the adjacent pile, and then the steel sheet pile is vibrated to sink after the pile is stable, the position is correct and vertical. And (3) stopping vibration to detect the verticality of the pile every time the steel pile sinks for about 1-2 m, finding out deviation and correcting in time.
And fifthly, suddenly reducing the sinking speed of the steel pile in the pile sinking, stopping the pile sinking, upwards pulling the steel pile for 0.6-1.0 m, and then rapidly sinking again.
5. Excavation of foundation pit
The excavation depth of the foundation pit is 7.9m, the length of the foundation pit along the road is 14m, and the width of the foundation pit is 12 m. Excavating twice, wherein the first excavation depth is 3m, the second excavation depth is 4.9m, and an unearthed channel is reserved on the east side of the road.
6. Demolish splayed wall and barricade
And stopping the machine for 2 lines and 180 minutes by using a III-grade sealing point seal, and chiseling the existing retaining wall and splayed wall in the hammer point. The stone chips between the lines are cleaned by manual cooperation.
7. Manufacture of slide plate, anchor beam, guide pier and back
a. Sliding plate
The central line of the sliding plate is consistent with the design central line of the jacking frame, and the sliding plate is a 20cm gravel cushion and 30cmC25 concrete. The front end of the sliding plate is longer than the box body by 1m, the rear end of the sliding plate is connected with the back, the two sides of the sliding plate are respectively wider than the box body by 1m, and the bottom of the sliding plate is connected with the ground anchor beam.
In order to enable the top surface of the sliding plate to reach higher flatness, a square grid control elevation method is adopted for control, namely, before the sliding plate is poured, the horizontal control piles are lofted, and reinforcing steel bar heads with the diameter not smaller than 16mm are driven into the soil body of a working pit to form a 2.5m square grid.
b. Ground anchor beam
The ground anchor beam is C25 concrete, is positioned at the bottom of the sliding plate, has the same length as the sliding plate, 0.7m width, 0.5m depth and 3m spacing. The earth anchor beam soil body adopts manual excavation, and the concrete is poured together with the slide body.
c. Guide pier
In order to reduce the direction deviation of the frame after jacking and starting, guide piers are arranged on two sides of the sliding plate, the distance between the center of each guide pier and the wall side of the frame structure is 0.3m, the width of each guide pier is 0.4m, and the height of each guide pier is 0.5 m. The guide piers are arranged longitudinally as shown in fig. 2.
d. Sliding layer
After the bottom plate is constructed, the machine oil and the talcum powder with the thickness of 3mm are coated on the bottom plate, the surface is required to be smooth, and a layer of plastic cloth is laid before the frame-structured bottom plate is poured to reduce the jacking friction resistance.
e. Back
The back beam is 11m long, 1.5m wide and 2.5m high, and is of a C25 reinforced concrete structure. The back beam and the sliding plate are poured simultaneously. And (5) binding the steel bars according to the requirements of design drawings. The template adopts a wood pattern, and simultaneously adopts 5-5 cm square wood and a steel pipe for reinforcement. The concrete is fully vibrated and compacted by pumping.
8. Frame culvert prefabrication
The frame structure is prefabricated by utilizing an adjacent C-type plan, the total length of the frame structure is 11m, the inner diameter is 6m, the net height is 7.2m, the thickness of a bottom plate is 0.6m, the thicknesses of side walls and a top plate are 0.5m, a main body is cast by C35 concrete, and a bowl-buckled full-hall red scaffold is adopted. As shown in fig. 3.
9. Jacking frame culvert
And (4) sealing and stopping by using a III-grade sealing point, namely, organically walking 2 lines for 24 hours to carry out jacking construction, wherein the jacking distance is 8.5 m. A new isolating switch and a section insulator are installed on the overhead line system on the machine-walking 2 lines at this time for permanent use.
a. Removing circuits and contacting network cables
According to the jacking position, 50m of lines need to be removed, joints 3 are opened, 20 sleepers are removed, and contact network cables 420m are removed. 4 electric screw loosening machines, 2 gas welding acetylene sleeves, 30 crowbars, 1 220 digging machine, 7 ladder cars, 50 net workers and 80 linemen, and the time is 1 hour.
b. Chiseling on bottom plate of U-shaped groove
And carrying out U-shaped groove cultivation on the seeds with the length of 11.5m, the width of 2.8m and the depth of 1.2m, wherein the total length is 38.6 m. And (4) chiseling by matching an excavator with a cannon hammer, and transporting earth and stones to the south side of the frame structure. 2 hammers 220 and 2 excavators 220, and the time is 10 hours.
c. Laying slide rail
And after the U-shaped groove is chiseled, leveling the original ground, paving 11P 50-8.5m slide rails in total, and connecting the slide rails with the top of the slide plate. The P50 splice splint 11 cover, lineman 50, for 2 hours.
d. Frame structure jacking
And (4) jacking the steel pipe by 8.5m, selecting 500t of oil jack, jacking 4 pickaxes for standby 1 jack, and jacking 0.6m per hour for each pickaxe. 15 people in common work, and the time is 7 hours.
Carrying out iron jacking: and setting top irons with the top ranges of 50cm, 1m, 2m and 4 m. When the supporting device is placed, the direction of the iron jacking column is consistent with the jacking force axis, and the supporting surface is required to be closely attached. When the jacking is detected to have deformation (such as arching, bending and the like), the jacking is immediately stopped for adjustment. The steel plate is flat, straight and is vertical to the cross iron or the cross beam.
Distributing the cross beams: in order to transmit the acting force of the jack to the back and the box body, a beam is respectively arranged between the back and the top iron and between the box body bottom plate and the jack. The beam is horizontally arranged by an upper layer and a lower layer of two I-shaped steels with the thickness not less than I500 multiplied by 200mm, and the upper layer I-shaped steel and the lower layer I-shaped steel are welded together by reinforcing steel bars.
A top column beam: in order to keep the stability of the jacking iron, a jacking column cross beam which is welded by two I-shaped steels not smaller than I500 x 200mm is arranged every 4-8 m and is arranged in a fixed section which is changed into a long jacking column.
e. Recovery circuit and contact network cable
And (4) ballasting in advance in the frame culvert, placing sleepers, jacking in place, connecting the circuits, and supplementing the ballast and tamping drums. The contact net utilizes the power failure skylight point of the elm secondary junction for 180 minutes, and 400 meters of 083# -094# conductor bearing wires are replaced. 2 rail hauler, 2 flexible axle tamping tools, 20m railway ballast, 20 sets of line accessories, 80 linemen, 50 net workers, 6 ladder cars, 3 hours of time.
Power outage range: the ascending and descending lines between the ulmus pumila (without) and the prunus humilis (without) comprise the first, second, third, fourth and northelm turn-back sections; and the power supply arm of the overhead contact net of the cargo connection ascending line and the overhead contact net of the cargo connection descending line between the middle vessel logistics park (without), the elm secondary field (with) and the elm secondary field (with) is powered off.
f. Opening of inspection
And checking the line elevation, the correction loss and the connection condition of the fastening fittings, cleaning the road material, and reaching the opening condition, wherein the time is 1 hour and 20 workers are required.
The railway frame culvert is lengthened by adopting a lateral jacking mode. The construction method has high construction feasibility, minimizes the influence on the operation of the existing line, reduces the safety risk, improves the working efficiency, accelerates the construction progress, shortens the construction period and has obvious economic benefit and social benefit.
Claims (3)
1. A construction method for jacking a side position of an existing line crossing inside a frame culvert point comprises the following steps of (1) manually digging a hole and protecting a pile for construction; (2) dismantling the plate girder and the bridge deck attachment; (3) changing the road; (4) constructing a steel sheet pile; (5) excavating a foundation pit; (6) dismantling the splayed wall and the baffle; (7) manufacturing a sliding plate, an anchor beam, a guide pier, a sliding layer and a back; (8) prefabricating a frame culvert; (9) jacking the frame culvert; (10) restoring the retaining wall; (11) backfilling a foundation pit; (12) auxiliary engineering and pavement restoration, characterized in that, the frame culvert jacking of (9) includes the following steps:
a. removing the line and the contact network cable, removing the line, opening the joint and removing the sleeper according to the jacking position;
b. chiseling the bottom plate of the U-shaped groove by adopting an excavator matched with a cannon hammer;
c. after the U-shaped groove is chiseled, leveling the original ground, and paving a sliding rail which is connected with the sliding rail at the top of the sliding plate;
d. the frame constructs the top and advances, chooses 500t hydraulic jack, top iron for use: setting top irons with the top ranges of 50cm, 1m, 2m and 4m, wherein when the top irons are placed, the direction of top iron top columns is consistent with the axis of a jacking force, and the supporting surfaces are required to be closely attached; in order to transmit the acting force of the jack to the back and the box body, a beam is respectively arranged between the back and the top iron and between the box body bottom plate and the jack; the beam is horizontally placed by an upper layer and a lower layer of two I-shaped steels with the thickness not less than I500 multiplied by 200mm, and the upper layer I-shaped steel and the lower layer I-shaped steel are welded together by reinforcing steel bars; in order to keep the stability of the jacking iron, a jacking column cross beam which is welded by two I-shaped steels not smaller than I500 x 200mm is arranged every 4-8 m and is arranged in a fixed section which is changed into a long jacking column;
e. restoring the line and contacting the network cable, loading the ballast in advance in the frame culvert, placing sleepers, connecting the line after jacking in place, and repairing the ballast and tamping drum.
2. The construction method for jacking in the cross existing line side position in the frame culvert point according to claim 1, wherein in the step (8), the prefabricated body of the frame culvert is cast by C35 concrete, and a bowl-buckled full-hall red scaffold is adopted.
3. The construction method for jacking across the existing line side in the frame culvert point according to claim 1, wherein the step (7) of constructing the slide plate, the anchor beam, the guide pier, the sliding layer and the back specifically comprises the following steps:
a. the center line of the sliding plate is consistent with the design center line of the jacking frame, and the sliding plate is a 20cm gravel cushion and 30cmC25 concrete; the front end of the sliding plate is longer than the box body by 1m, the rear end of the sliding plate is connected with the back, the two sides of the sliding plate are respectively wider than the box body by 1m, and the bottom of the sliding plate is connected with the ground anchor beam; in order to enable the top surface of the sliding plate to reach higher flatness, a square grid control elevation method is adopted for control, namely, before the sliding plate is poured, a horizontal control pile is lofted, and a reinforcing steel bar head with the diameter not smaller than 16mm of the horizontal control pile is driven into the soil body of a working pit to form a 2.5m square grid;
b. the ground anchor beam is C25 concrete and is positioned at the bottom of the sliding plate, the length of the ground anchor beam is consistent with that of the sliding plate, the width of the ground anchor beam is 0.7m, the depth of the ground anchor beam is 0.5m, and the distance of the ground anchor beam is 3 m;
the earth anchor beam soil body adopts manual excavation, and concrete and the sliding plate body are poured together;
c. the guide piers are arranged on two sides of the sliding plate in order to reduce the direction deviation of the frame after jacking and starting, the center of each guide pier is 0.3m away from the frame structure wall, the width of each guide pier is 0.4m, and the height of each guide pier is 0.5 m;
d. after the construction of the bottom plate of the sliding layer, coating machine oil and talcum powder with the thickness of 3mm on the bottom plate, and paving a layer of plastic cloth before pouring the frame bottom plate to reduce the jacking friction;
e. the back is of a C25 reinforced concrete structure, the back beam and the sliding plate are simultaneously poured, steel bars are bound according to the requirements of design drawings, a template adopts a wood pattern, and simultaneously, 5 × 5cm square timbers and steel pipes are adopted for reinforcement; the concrete is fully vibrated and compacted by pumping.
Priority Applications (1)
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