CN113217002B - Construction method for jacking side positions crossing existing lines in frame culvert points - Google Patents
Construction method for jacking side positions crossing existing lines in frame culvert points Download PDFInfo
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- CN113217002B CN113217002B CN202110381790.2A CN202110381790A CN113217002B CN 113217002 B CN113217002 B CN 113217002B CN 202110381790 A CN202110381790 A CN 202110381790A CN 113217002 B CN113217002 B CN 113217002B
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 239000004567 concrete Substances 0.000 claims description 18
- 239000010410 layer Substances 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 239000002689 soil Substances 0.000 claims description 7
- 235000000396 iron Nutrition 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 241001669679 Eleotris Species 0.000 claims description 2
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- 239000011150 reinforced concrete Substances 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000009432 framing Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000001681 protective effect Effects 0.000 abstract description 4
- 238000009412 basement excavation Methods 0.000 description 7
- 238000003825 pressing Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000009417 prefabrication Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
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- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
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Classifications
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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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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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; comprises (1) constructing a manual hole digging protective pile; (2) dismantling the plate girder and the bridge deck auxiliary; (3) changing the road; (4) construction of steel sheet piles; (5) excavating a foundation pit; (6) dismantling the splayed wall and the retaining wall; (7) The method comprises the steps of manufacturing a sliding plate, an anchor beam, a guide pier, a sliding layer and a back; (8) prefabricating a frame culvert; (9) jacking a frame culvert; (10) restoring the retaining wall; (11) backfilling the foundation pit; (12) auxiliary engineering and pavement restoration; the method of the present invention minimizes the impact on rail transportation. The method has the advantages of practicality, convenient operation and reduced construction cost. The safety risk is reduced, and the driving safety is ensured. The prefabricated frame is far away from the existing line, and the driving interference is small. The working efficiency is improved, the construction progress is quickened, and the construction period is shortened. The prefabricated frame culvert does not need point construction, and the construction progress is independently controllable. Meanwhile, the protection measures for the existing wires 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, the common method for the extension construction of the existing railway frame culvert comprises the following steps: and (5) sealing and stopping the existing line cast-in-situ construction. The method has long existing line sealing time, has larger influence on railway transportation, is generally suitable for sections with smaller transportation quantity or smaller influence on railway transportation, and therefore, the construction method of the extension railway frame culvert brings great inconvenience to railway transportation; the construction method is required to be small in influence on railway transportation and safe, convenient and economical.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a construction method for jacking a side position crossing an existing line in a frame culvert point.
In order to solve the technical problems, the invention adopts the following technical scheme: a construction method for jacking a cross existing line side in a frame culvert point comprises the steps of (1) constructing a manual hole digging protection pile; (2) dismantling the plate girder and the bridge deck auxiliary; (3) changing the road; (4) construction of steel sheet piles; (5) excavating a foundation pit; (6) dismantling the splayed wall and the retaining wall; (7) The method comprises the steps of manufacturing a sliding plate, an anchor beam, a guide pier, a sliding layer and a back; (8) prefabricating a frame culvert; (9) jacking a frame culvert; (10) restoring the retaining wall; (11) backfilling the foundation pit; (12) The auxiliary engineering and pavement restoration are characterized in that the frame culvert jacking in the step (9) comprises the following steps:
a. removing the line and the contact net wires, 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, and chiseling by adopting an excavator and a gun hammer;
c. after the U-shaped groove chisel is removed, leveling the original ground, paving a sliding rail, and connecting with the sliding rail at the top of the sliding plate;
d. the frame structure is jacked in, 500t oil jack is selected for use, and the top iron: setting top irons with the top strokes of 50cm, 1m, 2m and 4m, wherein the direction of a top iron top column is consistent with a top force axis when the top irons are placed, and the supporting surfaces are 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 bottom plate of the box body and the jack; the beam adopts two I-steel sheets with the length of not less than I500 multiplied by 200mm to be horizontally placed on an upper layer and a lower layer, and the upper layer and the lower layer of I-steel sheets are welded together by using steel bars; in order to keep the stability of the top iron, a top column cross beam which is welded by two I-steel sheets with the length not less than I500 multiplied by 200mm is arranged every 4-8 m, and the top column cross beam is arranged in a fixed section which is changed into a long top column;
e. restoring the line and contacting the net wires, feeding ballast in advance in the frame culvert, placing sleepers, jacking in place, connecting the line, and supplementing the ballast and tamping the drum.
Compared with the prior art, the invention has the following beneficial effects:
the method of the present invention minimizes the impact on rail transportation. The prior construction such as the existing retaining wall, the splayed wall and the like can be chiseled off in the early stage, and the construction can be carried out by utilizing a railway skylight for 3 hours every day. When jacking, only the machine is required to be closed for wiring 24 hours.
The method has the advantages of practicality, convenient operation and reduced construction cost.
The safety risk is reduced, and the driving safety is ensured. The prefabricated frame is far away from the existing line, and the driving interference is small.
The working efficiency is improved, the construction progress is quickened, the construction period is shortened, and the economic benefit and the social benefit are obvious. The prefabricated frame culvert does not need point construction, and the construction progress is independently controllable. Meanwhile, the protection measures for the existing wires are correspondingly less, and the investment is saved.
Drawings
FIG. 1 is a schematic diagram of a pile construction according to example 1.
Fig. 2 is a schematic view of the longitudinal arrangement of the guide pier of embodiment 1.
Fig. 3 is a schematic diagram of a frame culvert prefabrication.
The figures are labeled as follows:
1-protection piles, 2-existing organic 2 lines, 3-steel sheet piles, 4-guiding piers, 5-anchor beams and 6-sliding plates.
Detailed Description
The invention is further illustrated below with reference to specific examples.
Example 1
In the embodiment, the construction method is adopted to carry out jacking construction of crossing the side position of the existing line in the frame culvert point by taking the construction of the extension length of the frame culvert of the elm secondary station energy expansion transformation project DL9 K0+384.61-6 m as an example.
The net height of the culvert with 1-5m at the position of DL9K0+384.60 is 6m, the station internal machine runs 2 lines to pass through the culvert, and if cast-in-situ construction is adopted, the machine needs to be shut down for 2 lines for 60 days, so that the influence on transportation is large. In combination with the field practice, the back side of the machine-walking 2-wire north prefabricated frame culvert is needed to be jacked in.
The culvert is lengthened by adopting a 1-6m frame culvert, the jacking length is 11m, the jacking distance is 8.5m, the jacking section adopts hole digging piles and steel sheet piles to protect the existing roadbed, the contact net wires are changed in points, the circuits are removed, the U-shaped groove concrete bottom plate is chiseled, and the circuits and the contact net wires are restored after jacking in place.
Principle of: prefabricating the side positions of the frame culvert, and jacking in points. Firstly, manually digging a protective pile on the west side of a foundation pit, removing the fence of an elm-plaited line workshop, shifting a temporary road, and applying a steel plate protective pile on the north side of the foundation pit. Chiseling off concrete pavement of the existing 1-13m plate girder and the concrete pavement of the roads on two sides, and removing auxiliary structures such as anti-throwing nets on the plate girder. And (3) lifting the existing 1-13m plate beam by using a class III locking point and adopting a 200t crane. Then, the foundation pit excavation operation is carried out, a soil outlet channel is arranged at the east side of the foundation pit, and meanwhile, the existing splayed wall and the retaining walls at the two sides of the existing 2-line are chiseled by utilizing III-level blocking points. And then constructing a sliding plate, a guide pier, an anchor beam and the like. After the prefabrication of the frame culvert is completed, the machine is removed by utilizing a III-level locking point (24 h) to walk 2 lines, the frame culvert is jacked into place, and the lines are restored. And then performing construction such as foundation pit backfilling, retaining wall restoration, 1-13m plate girder, existing concrete roads and the like.
The method specifically comprises the following steps:
1. construction of manual hole digging protective pile
As shown in FIG. 1, the jacking section is provided with a manual hole digging protection pile on the left side of the machine travel 2 line and the western side of the foundation pit. The pile diameter of the manual hole digging pile is 1.25m, the pile length is 16m, and the distance is 2m. And (3) pouring the concrete retaining wall by manual stirring, and forming holes by a mode of removing soil from a manual windlass. The reinforcement sections of the main body of the hole digging pile are bound in the holes, and concrete is poured by adopting a ground pump. According to design geological data calculation, the underground water line is positioned at a position 6m below the rail surface, and water is pumped by a water pump to be pumped below 12.81m to carry out downthehole precipitation. And excavating by adopting a mode of separating pile excavation.
2. Dismantling plate girder and bridge deck accessory
a. And manually dismantling the existing heating pipeline and pipeline bracket at the 1-13m plate girder by using an adjacent C-type plan. And chiseling off the concrete pavement of the plate girder with the thickness of 1-13m and the concrete pavement of the roads on the two sides by adopting a small gun hammer machine, and dismantling the auxiliary structures such as the anti-throwing net on the plate girder.
b. And (3) stopping the machine for 180 minutes by using a III-level locking point seal machine, and dismantling 1-13m existing plate beams in the point seal machine. The single plate beam is 25t in weight and two plates are counted, and a 200t crane is adopted for two times of hoisting.
3. Road change
The 1-6m frame culvert foundation pit is positioned on the south side of the elm braided line workshop, and the existing road is required to be moved before the foundation pit is excavated. The newly built passageway is located the elm and compiles the line shop storehouse outside, need demolish existing enclosure and repair 43m and build interim humanoid passageway. The width of the temporary transfer road is 2.5-4m, the temporary transfer road is connected with the existing road front and back, and the pavement is paved with 0.2m thick gravels. Color steel plates are arranged outside the sidewalk for isolation. An anti-collision sand pier is arranged at the crossing, a reflective strip is attached to the color steel plate, and a warning and indicating sign is provided.
4. Construction of steel sheet piles
Larson steel sheet piles are adopted for protection on the north side of the foundation pit, and the length of each steel sheet pile is 15m. And (5) adopting a vibration pile pressing method for construction.
When the pile driver presses the pile, the center lines of the pile cap and the pile body are required to coincide.
(2) The verticality of the pile body is checked at any time in the pile pressing process, in the initial pressing process, the pile body is found to be suddenly inclined and the equipment reaches rated pressure for 20 minutes in the pile body displacement, inclination and pressing process, and when the pile cannot sink, the pile body is lifted and driven in again.
(3) Before vibrating the pile, the pile clamp of the vibrating hammer should clamp the upper end of the steel pile, and make the center of gravity of the vibrating hammer and the steel pile on the same straight line.
(4) And the vibrating hammer clamps the steel pile to hoist, so that the steel pile is vertically positioned or the steel pile locking notch is inserted into the adjacent pile locking notch, and after the pile is stable, the position is correct and vertical, the pile is vibrated and sunk. And when the steel pile sinks for about 1-2 m, stopping vibration to detect the perpendicularity of the pile, finding out deviation and correcting in time.
(5) The sinking speed of the steel pile in the pile sinking is suddenly reduced, the pile sinking is stopped, the steel pile is pulled up by 0.6-1.0 m, and then the pile sinking is fast again.
5. Pit excavation
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 12m. The method comprises the steps of twice excavation, wherein the first excavation depth is 3m, the second excavation depth is 4.9m, and a soil outlet channel is reserved on the east side of a road.
6. Demolishing splayed wall and retaining wall
And (3) stopping the machine for 180 minutes by using a III-level locking point seal machine, and chiseling off the existing retaining wall and the splayed wall by using a gun hammer point. Manually cleaning the stone scraps between the wires.
7. Manufacturing of sliding plate, anchor beam, guide pier and back
a. Skateboard
The center line of the slide plate is consistent with the design center line of the jacking frame, and the slide plate is 20cm of broken stone cushion layer and 30cmC of concrete. The front end of the sliding plate is 1m longer than the box body, the rear end of the sliding plate is connected with the back, the two sides of the sliding plate are 1m wider than the box body, and the bottom of the sliding plate is connected with the ground anchor beam.
In order to achieve higher flatness of the top surface of the sliding plate, a square grid control elevation method is adopted for control, namely, a horizontal control pile is lofted before the sliding plate is poured, and a reinforcing steel bar head with the diameter not smaller than 16mm is driven into the soil body of a working pit to form a square grid of 2.5 m.
b. Ground anchor beam
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 the length 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 between the ground anchor beam and the sliding plate is 3m. The ground anchor beam soil body is excavated manually, and concrete and the slide plate body are poured together.
c. Guide pier
In order to reduce the direction deviation after the frame jacking is started, guide piers are arranged on two sides of the sliding plate, the center distance between the guide piers and the frame wall edge is 0.3m, the width of the guide piers is 0.4m, and the height of the guide piers is 0.5m. The guide piers are longitudinally arranged as shown in fig. 2.
d. Sliding layer
After the construction of the bottom plate is finished, the bottom plate is coated with engine oil with the thickness of 3mm and talcum powder, and a plastic cloth layer is paved before the pouring of the frame structure bottom plate, so that the jacking friction resistance is reduced.
e. Back support
The back beam is 11m long, 1.5m wide and 2.5m high, and is a C25 reinforced concrete structure. And the back beam and the sliding plate are poured simultaneously. Binding the steel bars according to the requirements of the design drawing. The template adopts a wood pattern, and simultaneously adopts 5cm square timber and steel pipes for reinforcement. The concrete is pumped and fully vibrated and compacted.
8. Prefabrication of frame culvert
The frame structure is prefabricated by using an adjacent C-type plan, the full 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 thickness of side walls and top plates is 0.5m, a main body is poured by C35 concrete, and a bowl-buckle type full-red scaffold is adopted. As shown in fig. 3.
9. Frame culvert jacking
And (3) sealing and stopping the existing organic line for 24 hours by using a III-level sealing point to carry out jacking construction, wherein the jacking distance is 8.5m. The contact net is provided with a new isolating switch and a segmented insulator on the machine-running line 2 at this time to be used permanently.
a. Dismantling line and contact net wire
According to the jacking position, the line 50m is required to be removed, the joint 3 is opened, 20 sleepers are removed, and the contact net wire 420m is removed. 4 electric screw loosening machines, 2 gas welding acetylene sleeves, 30 crow bars, 1 machine for 220 digging machines, 7 ladder trucks, 50 net workers, 80 line workers and 1 hour.
b. U-shaped groove bottom plate chisel
The U-shaped groove has the length of 11.5m, the width of 2.8m and the depth of 1.2m, and the total length of 38.6 m. And (3) chiseling by adopting an excavator and a gun hammer, and transporting the earthwork to the south side of the frame structure. 220 gun hammer 2, 220 digger 2, time 10 hours.
c. Laying slide rail
After the U-shaped groove chisel is completed, the original ground is leveled, 11P 50-8.5m slide rails are paved, and the slide rails are connected with the slide plate top slide rails. P50 joint splint 11 cover, line man 50, time 2 hours.
d. Frame structure jacking
8.5m of jacking, 4 picks are jacked by 500t oil jack, 1 pick is reserved, and 0.6m of jacking is carried out per hour. The time is 7 hours for 15 workers.
Top iron: and setting top irons with the top strokes of 50cm, 1m, 2m and 4 m. When the bearing is placed, the direction of the top iron jacking column is consistent with the jacking axis, and the bearing surface is closely attached. If deformation (such as arching or bending) is found during the jacking, the jacking is stopped immediately to perform adjustment. The steel plate is flat, straight and perpendicular to the cross iron or the cross beam.
Distribution beam: 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 bottom plate of the box body and the jack. The beam adopts two I-steel sheets with the length of not less than I500 multiplied by 200mm to be horizontally placed on an upper layer and a lower layer, and the I-steel sheets on the upper layer and the lower layer are welded together by using steel bars.
Top column beam: in order to keep the stability of the top iron, a top column cross beam which is welded by two I-steel sheets with the length not less than I500 multiplied by 200mm is arranged every 4-8 m, and the top column cross beam is arranged in a fixed section which is changed into a long top column.
e. Recovery line and contact net wire
And feeding ballast in the frame culvert in advance, placing sleepers, jacking into position, connecting a line, and supplementing the ballast and tamping. The catenary uses elm hinges to cut off the skylight point for 180 minutes, and the 083# -094# carrier wire is replaced by 400 meters. 2 track lifting and pulling machines, 2 flexible shaft tamping machines, 20 railway ballasts, 20 line fittings, 80 line workers, 50 net workers, 6 ladder vehicles and 3 hours.
The power failure range: elm (not included) -ringing plum (not included) up-down line (including elm one, two, three, four, elm north reentrant stage); the power supply arm of the intermediate tripod logistics park (not containing) -intermediate goods link uplink and intermediate tripod connecting line (not containing) -intermediate tripod logistics park (not containing) -intermediate goods link downlink contact network is powered off.
f. Checking opening
Checking the elevation, loss and buckling accessory connection condition of the line, cleaning the road material, reaching the opening condition, and taking 20 people in labor for 1 hour.
And lengthening the railway frame culvert by adopting a side jacking mode. The construction method has high construction feasibility, reduces the influence on the existing line operation to the minimum, reduces the safety risk, improves the working efficiency, accelerates the construction progress, shortens the construction period and has obvious economic and social benefits.
Claims (3)
1. A construction method for jacking a cross existing line side in a frame culvert point comprises the steps of (1) constructing a manual hole digging protection pile; (2) dismantling the plate girder and the bridge deck auxiliary; (3) changing the road; (4) construction of steel sheet piles; (5) excavating a foundation pit; (6) dismantling the splayed wall and the retaining wall; (7) The method comprises the steps of manufacturing a sliding plate, an anchor beam, a guide pier, a sliding layer and a back; (8) prefabricating a frame culvert; (9) jacking a frame culvert; (10) restoring the retaining wall; (11) backfilling the foundation pit; (12) The auxiliary engineering and pavement restoration are characterized in that the frame culvert jacking in the step (9) comprises the following steps:
a. removing the line and the contact net wires, 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, and chiseling by adopting an excavator and a gun hammer;
c. after the U-shaped groove chisel is removed, leveling the original ground, paving a sliding rail, and connecting with the sliding rail at the top of the sliding plate;
d. the frame structure is jacked in, 500t oil jack is selected for use, and the top iron: setting top irons with the top strokes of 50cm, 1m, 2m and 4m, wherein the direction of a top iron top column is consistent with a top force axis when the top irons are placed, and the supporting surfaces are closely attached; in order to transmit the acting force of the jack to the back and the frame culvert, a beam is respectively arranged between the back and the top iron as well as between the bottom plate of the frame culvert and the jack; the beam adopts two I-steel sheets with the length of not less than I500 multiplied by 200mm to be horizontally placed on an upper layer and a lower layer, and the upper layer and the lower layer of I-steel sheets are welded together by using steel bars; in order to keep the stability of the top iron, a top column cross beam which is welded by two I-steel sheets with the length not less than I500 multiplied by 200mm is arranged every 4-8 m, and the top column cross beam is arranged in a fixed section which is changed into a long top column;
e. restoring the line and contacting the net wires, feeding ballast in advance in the frame culvert, placing sleepers, jacking in place, connecting the line, and supplementing the ballast and tamping the drum.
2. The construction method for jacking the crossing existing line side positions in the frame culvert points according to claim 1, wherein the prefabricated main body of the frame culvert in the step (8) is poured by C35 concrete, and a bowl-buckling type full framing scaffold is adopted.
3. The construction method for jacking crossing existing line side positions in a frame culvert point according to claim 1, wherein the construction of the sliding plate, the anchor beam, the guide pier, the sliding layer and the back in the step (7) 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 20cm of broken stone cushion layer and 30cmC concrete; the front end of the sliding plate is longer than the frame culvert by 1m, the rear end of the sliding plate is connected with the back, the two sides of the sliding plate are wider than the frame culvert by 1m, and the bottom of the sliding plate is connected with the ground anchor beam; in order to achieve higher flatness of the top surface of the sliding plate, a square grid control elevation method is adopted for control, namely, a horizontal control pile is lofted before the sliding plate is poured, and a 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 square grid of 2.5 m;
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 the length 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 3m; the ground anchor beam soil body is excavated manually, and concrete and the slide 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 after the frame is jacked and started, the center of the guide piers is 0.3m away from the wall edge of the frame structure, the width of the guide piers is 0.4m, and the height of the guide piers is 0.5m;
d. after the construction of the sliding layer and the bottom plate is finished, coating engine oil and talcum powder with the thickness of 3mm on the sliding layer, wherein the sliding layer is required to be smooth and clean in surface, and plastic cloth is paved before the pouring of the frame structure bottom plate so as to reduce jacking friction resistance;
e. the back, the back C25 reinforced concrete structure, the back beam and the slide plate are poured at the same time, steel bars are bound according to the requirements of a design drawing, a template adopts a wood form, and 5 x 5cm square timber and steel pipes are adopted for reinforcement; the concrete is pumped and fully vibrated and compacted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110381790.2A CN113217002B (en) | 2021-04-09 | 2021-04-09 | Construction method for jacking side positions crossing existing lines in frame culvert points |
Applications Claiming Priority (1)
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