CN117738065A - Construction method for seamless connection of steel-concrete trestle and earthwork ramp - Google Patents
Construction method for seamless connection of steel-concrete trestle and earthwork ramp Download PDFInfo
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- CN117738065A CN117738065A CN202311868327.6A CN202311868327A CN117738065A CN 117738065 A CN117738065 A CN 117738065A CN 202311868327 A CN202311868327 A CN 202311868327A CN 117738065 A CN117738065 A CN 117738065A
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- 239000004567 concrete Substances 0.000 title claims abstract description 83
- 238000010276 construction Methods 0.000 title claims abstract description 61
- 239000002689 soil Substances 0.000 claims abstract description 55
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 16
- 210000001503 joint Anatomy 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 7
- 238000009412 basement excavation Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000002344 surface layer Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 2
- 230000003014 reinforcing effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to the technical field of earthwork ramps, and discloses a construction method for seamless connection of a steel-concrete trestle and an earthwork ramp, which comprises the following construction steps: 1) Planning foundation pit layout in a construction site to form a foundation pit area, wherein a plurality of lattice columns are constructed in the foundation pit area; 2) Setting a template, placing a trestle steel bar frame and pouring concrete on the foundation pit area, and curing to form a steel-concrete trestle, wherein the bottom of the steel-concrete trestle is abutted to the top of the lattice column; 3) Digging a soil body in the foundation pit area to form a foundation pit, wherein an earthwork ramp is formed in the foundation pit and is in butt joint with the reinforced concrete trestle to form a through lane, and transporting the soil body out of the foundation pit by utilizing a carrier vehicle; when the foundation pit is excavated to the set depth, constructing an inner support in the foundation pit until the foundation pit is excavated to the set depth of the pit bottom; 4) Removing the earthwork ramp layer by layer; 5) A construction platform is arranged on the steel-concrete trestle, and a grab bucket machine is utilized to grab and transport the soil formed by removing the earthwork ramp; 6) And dismantling the steel-concrete trestle.
Description
Technical Field
The invention relates to the technical field of earthwork ramps, in particular to a construction method for seamless connection of a steel-concrete trestle and an earthwork ramp.
Background
At present, along with the continuous growth of urban construction, the underground space required by high-rise buildings is larger and larger, and foundation pit excavation is deeper and deeper. In the construction process, a large amount of earthwork can be generated for outward transportation, and the problems of slow field soil discharge and high cost of the ultra-deep foundation pit are solved at present.
In the prior art, in the selection of a pit road under a transport vehicle, at present, two modes are mainly adopted, one mode is that a soil ramp is directly connected into a pit, the inner support construction of a deep foundation pit can be influenced, and the inner support of a superposition part 10 can not be normally constructed as expected, and the problem is various in the later period. The secondary approach of the material, the project progress can not be completed in time, and a process can be repeatedly performed.
Or a reinforced concrete trestle is adopted, the method has stable structure, safety and feasibility, and can solve the problem that the internal support cannot be constructed due to the unearthing of the earthwork ramp, but the method has the following defects: the steel structure has huge construction quantity of early hoisting and welding, a large amount of resources are needed, the construction period of all trestle is too long, the normal operation of on-site partial working procedures is influenced, the later dismantling is also needed to be high in cost, and the amount of dismantled building waste materials is large, so that the waste is caused.
Disclosure of Invention
The invention aims to provide a construction method for seamless connection of a steel-concrete trestle and an earthwork ramp, and aims to solve the problem of complicated unearthing operation of an ultra-deep foundation pit construction site in the prior art.
The invention discloses a construction method for seamless connection of a steel-concrete trestle and an earthwork ramp, which comprises the following construction steps:
1) Planning foundation pit layout in a construction site to form a foundation pit area, and determining the layout position of a steel-concrete trestle in the foundation pit area, wherein a plurality of lattice columns are constructed in the foundation pit area, and the tops of the lattice columns extend to the ground;
2) Setting a template on the foundation pit area, placing a trestle steel bar frame and pouring concrete, and dismantling the template after the concrete is cured and hardened to form the steel-concrete trestle, wherein the bottom of the steel-concrete trestle is abutted to the top of the lattice column;
3) Digging a soil body in the foundation pit area to form a foundation pit, wherein an earthwork ramp is formed in the foundation pit, the top side of the earthwork ramp is in butt joint with the bottom side of the steel-concrete trestle to form a through lane, and carrying the soil body excavated in the foundation pit area out of the foundation pit along the through lane by using a carrier vehicle;
when the foundation pit is excavated to the set depth, constructing an inner support in the foundation pit until the foundation pit is excavated to the set depth of the pit bottom;
4) Removing the earthwork ramp layer by layer;
5) Setting a construction platform on the steel-concrete trestle, and grabbing and transporting the soil formed by removing the earthwork ramp by using a grab bucket machine;
6) And dismantling the steel-concrete trestle.
Optionally, in the construction step 6), a scaffold is erected on the outer side of the steel-concrete trestle, and in the process of dismantling the steel-concrete trestle on the scaffold, a rope saw is used for cutting the steel-concrete trestle to form a cutting block, and the cutting block is lifted out of the foundation pit by a track crane.
Optionally, in the construction step 3), the slope rate of the earthmoving ramp is not greater than 1:1.
Optionally, in the construction step 3), the earthwork ramp has a ramp top surface arranged upward, after coarse aggregate is laid on the ramp top surface, C35 concrete is poured on the ramp top surface, and after the C35 concrete is hardened, a ramp top layer is formed.
Optionally, anti-collision walls are arranged on two sides of the top surface of the ramp, and the anti-collision walls are arranged along the length direction of the top surface of the ramp in an extending way; the anti-collision wall is provided with a guard rail which extends upwards, and the guard rail extends along the length direction of the anti-collision wall.
Optionally, the two sides of the earthwork ramp are respectively provided with a ramp side surface, a side reinforcing mesh is hung on the ramp side surface, a side surface layer is formed on the ramp side surface through concrete spraying, and the side reinforcing mesh is arranged in the side surface layer.
Optionally, in the construction step 5), a hollow hole is formed in the steel-concrete trestle, and the hollow hole penetrates through the steel-concrete trestle up and down; and the grab bucket machine grabs soil under the reinforced concrete stack bridge through the hollow hole.
Optionally, the top side of the earthwork ramp is provided with a top section which is in butt joint with the bottom side of the reinforced concrete trestle, and the top section is tamped downwards for a plurality of times, so that a plane section is formed on the top section, and the plane section is in butt joint with the reinforced concrete trestle.
Optionally, before the top section is tamped downwards for a plurality of times, a longitudinally arranged grouting pipe is inserted into the top section, the bottom of the grouting pipe is closed, the top of the grouting pipe is provided with an injection port, and a plurality of peripheral grouting holes are formed in the periphery of the grouting pipe;
in the process of downwards tamping the top section for many times, after each tamping treatment, arranging a metal net layer on the top section, wherein the metal net layer is downwards provided with a plurality of embedded tips, the embedded tips are embedded into the soil body of the top section, the injection opening is filled with slurry, and the slurry is injected into the soil body of the top section through peripheral grouting holes;
and after the top section is tamped downwards for many times, the injection opening is arranged flush with the top of the top section, the injection opening is closed after the grouting pipe is filled with slurry, and concrete is poured on the top section to form the plane section.
Optionally, in the construction step 3), the soil slope has a reverse soil pile, the reverse soil pile is formed below the steel-concrete trestle, and the reverse soil pile is reversely butted behind the soil slope along the direction from front to back of the soil slope;
the reverse soil pile is provided with a reverse slope surface which is arranged away from the top surface of the ramp, along with the excavation of the foundation pit, the reverse slope surface is tamped downwards for a plurality of times, a plurality of step surfaces which are arranged upwards are formed on the reverse slope surface, and a plurality of step surfaces are arranged at intervals along the height direction of the reverse slope surface.
Compared with the prior art, the construction method for seamless connection of the reinforced concrete trestle and the earthwork ramp comprises the steps of firstly constructing a structural column, constructing a reinforced concrete trestle on the top of the structural column, then excavating soil to form a foundation pit, forming an earthwork ramp which is in butt joint with the reinforced concrete trestle in the foundation pit in the excavation process, namely excavating the soil body of the earthwork ramp in a foundation pit area downwards, simultaneously transporting soil outwards through a through channel until the foundation pit is excavated to a set depth, constructing an inner support, and normally constructing the inner support until the foundation pit is excavated to the set depth of the pit bottom under the action of the reinforced concrete trestle, and then dismantling the through channel; therefore, the problem that the construction progress of the on-site internal support is affected by the complete adoption of the transportation of the earthwork ramp is avoided, the trouble that the landing stage is high in cost and later removed is avoided, namely, the effective combination of the earthwork ramp and the landing stage is adopted, the efficient soil discharge is realized, and the method has the advantages of high soil discharge efficiency and tight process connection.
Drawings
FIG. 1 is a schematic plan view of a prior art soil ramp direct access pit provided by the present invention;
fig. 2 is a construction schematic diagram of a construction method for seamless connection of a steel-concrete trestle and an earthwork ramp, which is provided by the invention;
fig. 3 is a schematic view of a portion of a hollow hole according to the present invention.
FIG. 4 is a schematic cross-sectional view of the through-road provided by the present invention;
FIG. 5 is a construction schematic of construction step 5) provided by the present invention;
FIG. 6 is a construction schematic of construction step 5) provided by the present invention;
fig. 7 is a schematic cross-sectional view of a traffic lane provided by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The implementation of the present invention will be described in detail below with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-7, a preferred embodiment of the present invention is provided.
The invention provides a construction method for seamless connection between a steel-concrete trestle 200 and an earthwork ramp 300, which comprises the following construction steps:
1) Planning foundation pit layout in a construction site to form a foundation pit area 100, determining the layout position of a steel-concrete trestle 200 in the foundation pit area 100, constructing a plurality of lattice columns in the foundation pit area 100, and extending the tops of the lattice columns to the ground;
2) Setting a template on the foundation pit area 100, placing a trestle steel bar frame and pouring concrete, and dismantling the template after the concrete is cured and hardened to form a steel-concrete trestle 200, wherein the bottom of the steel-concrete trestle 200 is abutted to the top of the lattice column;
3) Excavating a soil body in the foundation pit area 100 to form a foundation pit, wherein an earthwork ramp 300 is formed in the foundation pit, the top side of the earthwork ramp 300 is in butt joint with the bottom side of the steel-concrete trestle 200 to form a through lane, and the soil body excavated in the foundation pit area 100 is carried out of the foundation pit along the through lane by using a carrier vehicle;
when the foundation pit is excavated to the set depth, constructing an inner support in the foundation pit until the foundation pit is excavated to the set depth of the pit bottom;
4) Removing the earthmoving ramp 300 in layers;
5) Setting a construction platform 400 on the steel-concrete trestle 200, and grabbing and transporting the soil formed by the removed earthwork ramp 300 by using a grab bucket machine 500;
6) And dismantling the steel-concrete trestle 200.
According to the construction method for seamless connection between the steel-concrete trestle 200 and the earthwork ramp 300, the steel-concrete trestle 200 is formed by constructing the structural columns 110 at the top of the structural columns 110, then the soil is excavated to form a foundation pit, the earthwork ramp 300 which is in butt joint with the steel-concrete trestle 200 is formed in the excavation process of the foundation pit, namely, the soil except for the earthwork ramp 300 in the foundation pit area 100 is excavated downwards, the earth is transported outwards through a through channel while the foundation pit is excavated to a set depth, and an internal support is constructed, wherein under the action of the steel-concrete trestle 200, the internal support can be normally constructed until the foundation pit is excavated to the set depth at the bottom of the pit, and then the through channel is removed; thus, the problem that the transportation of the earthwork ramp 300 is completely adopted to influence the on-site internal support construction progress is avoided, the trouble that the cost of the trestle is high and the trestle is removed in the later period is avoided, namely, the effective combination of the earthwork ramp and the trestle is adopted, the efficient soil discharge is realized, and the method has the advantages of high soil discharge efficiency and tight process connection.
Specifically, after the soil is transported outward, the soil ramp is removed in layers firstly, and the sequence of going down and then going up is adopted. After the soil ramp in the pit is completely dismantled, erecting a platform of the grab bucket machine 500 on the trestle, opening holes on a trestle plate to remove soil, and after all earthwork in the pit is completely transported outwards, dismantling the trestle, wherein the dismantling sequence of the trestle is followed: the trabecula is disassembled firstly, and then the girder is disassembled; the secondary beam is disassembled firstly, the main beam is disassembled firstly, liang Kuazhong is disassembled firstly, and then the principle of disassembling the two ends of the beam is utilized. To ensure the safety of the demolition engineering.
Specifically, in the construction step 6), a scaffold is erected on the outer side of the steel-concrete trestle 200, and in the process of dismantling the steel-concrete trestle 200 on the scaffold, the steel-concrete trestle 200 is subjected to rope saw cutting to form a cutting block, and the cutting block is lifted out of a foundation pit by using a track crane. In this way, a quick removal is achieved.
In the construction step 3), the slope release rate of the earthmoving ramp 300 is not more than 1:1. Thus, the safety passing of the carrier vehicle is ensured.
In the preferred embodiment, in the construction step 3), the earthmoving ramp 300 has a ramp top surface disposed upward, and after coarse aggregate is laid on the ramp top surface, C35 concrete is poured on the ramp top surface, and after the C35 concrete is hardened, a ramp top layer 310 is formed. In this way, the top layer 310 of the ramp is formed with higher strength, and meets the driving requirement of the carrier vehicle.
Anti-collision walls are arranged on two sides of the top surface of the ramp, and the protection walls are arranged in an extending mode along the length direction of the top surface of the ramp; the guard rail is arranged on the anti-collision wall in an upward extending mode, and the guard rail is arranged along the length direction of the anti-collision wall in an extending mode.
The earthwork ramp 300 has ramp sides at both sides, respectively, on which side reinforcing mesh is hung, and on which side layer is formed by spraying concrete, the side reinforcing mesh being placed in the side layer. In this way, the side layers are reinforced by the side rebar mesh, stabilizing the earthmoving ramp 300 as a whole.
In the construction step 5), a hollow hole is formed in the steel-concrete trestle 200, and the hollow hole penetrates through the steel-concrete trestle 200 up and down; the grab bucket machine 500 grabs soil below the steel-concrete trestle 200 through the hollowed holes. In this way, the soil is facilitated to be grasped by the grapple machine 500.
Specifically, after the earthwork ramp 300 digs out the external earthwork preliminarily, the rest soil body of the earthwork ramp 300 is turned and piled up towards the steel-concrete trestle, so that the grab bucket machine 500 is adopted for taking the soil at the construction platform 400 in the later stage.
The top side of the earthmoving ramp 300 has a top section that interfaces with the bottom side of the steel-concrete bridge 200, and the top section is tamped down multiple times to form a planar section 301 on the top section, the planar section 301 interfacing with the steel-concrete bridge 200. In this way, a smooth transition of the vehicle from the earthmoving ramp 300 to the steel-concrete trestle 200 is ensured.
Before the top section is tamped downwards for a plurality of times, a longitudinally arranged grouting pipe 320 is inserted into the top section, the bottom of the grouting pipe 320 is closed, an injection port is formed in the top of the grouting pipe 320, and a plurality of peripheral grouting holes are formed in the periphery of the grouting pipe 320;
in the process of tamping the top section downwards for many times, after each tamping treatment, a metal net layer 330 is arranged on the top section, the metal net layer 330 is downwards provided with a plurality of embedded tips, the embedded tips are embedded into the soil body of the top section, slurry is poured into the pouring opening, and the slurry is sprayed into the soil body of the top section through the peripheral grouting holes;
after the top section is tamped down multiple times, the sprue is flush with the top of the top section, the sprue is closed after the grouting pipe 320 is filled with slurry, and concrete is poured onto the top section to form the planar section 301. In this way, the compaction process can make the soil compact and stable, and the top section is greatly reinforced by grouting, laying the metal mesh layer 330, and casting the concrete.
In the present embodiment, in the construction step 3), the earth slope 300 has a reverse soil pile formed under the steel-concrete bridge 200, and the reverse soil pile is reversely butted behind the earth slope 300 along the forward-backward direction of the earth slope 300;
the reverse soil pile is provided with a reverse slope surface which is arranged away from the top surface of the ramp, the reverse slope surface is tamped downwards for a plurality of times along with the excavation of the foundation pit, a plurality of upward arranged step surfaces 302 are formed on the reverse slope surface, and the step surfaces 302 are arranged at intervals along the height direction of the reverse slope surface. In this way, it helps to distribute the soil pressure, increasing the shear and friction forces of the soil slope, thereby reducing the risk of sliding and collapsing of the soil slope, making the earthmoving ramp 300 more stable.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The construction method for the seamless connection of the steel-concrete trestle and the earthwork ramp is characterized by comprising the following construction steps of:
1) Planning foundation pit layout in a construction site to form a foundation pit area, and determining the layout position of a steel-concrete trestle in the foundation pit area, wherein a plurality of lattice columns are constructed in the foundation pit area, and the tops of the lattice columns extend to the ground;
2) Setting a template on the foundation pit area, placing a trestle steel bar frame and pouring concrete, and dismantling the template after the concrete is cured and hardened to form the steel-concrete trestle, wherein the bottom of the steel-concrete trestle is abutted to the top of the lattice column;
3) Digging a soil body in the foundation pit area to form a foundation pit, wherein an earthwork ramp is formed in the foundation pit, the top side of the earthwork ramp is in butt joint with the bottom side of the steel-concrete trestle to form a through lane, and carrying the soil body excavated in the foundation pit area out of the foundation pit along the through lane by using a carrier vehicle;
when the foundation pit is excavated to the set depth, constructing an inner support in the foundation pit until the foundation pit is excavated to the set depth of the pit bottom;
4) Removing the earthwork ramp layer by layer;
5) Setting a construction platform on the steel-concrete trestle, and grabbing and transporting the soil formed by removing the earthwork ramp by using a grab bucket machine;
6) And dismantling the steel-concrete trestle.
2. The construction method for seamless connection between a steel-concrete trestle and an earthwork ramp according to claim 1, characterized in that in the construction step 6), a scaffold is erected on the outer side of the steel-concrete trestle, and in the process of dismantling the steel-concrete trestle on the scaffold, a rope saw is used for cutting the steel-concrete trestle to form a cutting block, and the cutting block is lifted out of a foundation pit by a crawler crane.
3. The construction method for seamless connection between a steel-concrete trestle and an earthwork ramp according to claim 1, wherein in the construction step 3), the slope release rate of the earthwork ramp is not more than 1:1.
4. The construction method for seamless connection between a reinforced concrete trestle and an earthwork ramp according to claim 1, characterized in that in the construction step 3), the earthwork ramp has an upward-arranged ramp top surface, coarse aggregate is laid on the ramp top surface, C35 concrete is poured on the ramp top surface, and after the C35 concrete is hardened, a ramp top layer is formed.
5. The construction method for seamless connection of a reinforced concrete trestle and an earthwork slope according to claim 4, wherein anti-collision walls are arranged on two sides of the top surface of the slope, and the anti-collision walls are arranged along the length direction of the top surface of the slope in an extending manner; the anti-collision wall is provided with a guard rail which extends upwards, and the guard rail extends along the length direction of the anti-collision wall.
6. The construction method for seamless connection between a reinforced concrete trestle and an earthwork ramp according to claim 1, wherein two sides of the earthwork ramp are respectively provided with a ramp side surface, a side reinforcing steel mesh is hung on the ramp side surface, a side surface layer is formed on the ramp side surface by spraying concrete, and the side reinforcing steel mesh is arranged in the side surface layer.
7. The construction method for seamless connection between a steel-concrete trestle and an earthwork ramp as defined in claim 1, wherein in the construction step 5), a hollow hole is formed in the steel-concrete trestle, and the hollow hole penetrates through the steel-concrete trestle up and down; and the grab bucket machine grabs soil under the reinforced concrete stack bridge through the hollow hole.
8. The construction method for seamless connection between a reinforced concrete trestle and an earthwork ramp according to claim 1, wherein the top side of the earthwork ramp is provided with a top section which is butted with the bottom side of the reinforced concrete trestle, and the top section is tamped downwards for a plurality of times so as to form a plane section on the top section, and the plane section is butted with the reinforced concrete trestle.
9. The construction method for seamless connection between a steel-concrete bridge and an earthwork slope according to any one of claims 8, wherein a longitudinally arranged grouting pipe is inserted into the top section before the top section is tamped down a plurality of times, the bottom of the grouting pipe is closed, the top of the grouting pipe is provided with an injection port, and a plurality of peripheral grouting holes are formed in the periphery of the grouting pipe;
in the process of downwards tamping the top section for many times, after each tamping treatment, arranging a metal net layer on the top section, wherein the metal net layer is downwards provided with a plurality of embedded tips, the embedded tips are embedded into the soil body of the top section, the injection opening is filled with slurry, and the slurry is injected into the soil body of the top section through peripheral grouting holes;
and after the top section is tamped downwards for many times, the injection opening is arranged flush with the top of the top section, the injection opening is closed after the grouting pipe is filled with slurry, and concrete is poured on the top section to form the plane section.
10. The construction method for seamless engagement of a steel-concrete bridge and an earthwork ramp according to any one of claims 1 to 9, characterized in that in the construction step 3), the earthwork ramp has a reverse pile formed under the steel-concrete bridge, and the reverse pile is butted against the rear of the earthwork ramp in the direction from the front to the rear of the earthwork ramp;
the reverse soil pile is provided with a reverse slope surface which is arranged away from the top surface of the ramp, along with the excavation of the foundation pit, the reverse slope surface is tamped downwards for a plurality of times, a plurality of step surfaces which are arranged upwards are formed on the reverse slope surface, and a plurality of step surfaces are arranged at intervals along the height direction of the reverse slope surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311868327.6A CN117738065A (en) | 2023-12-29 | 2023-12-29 | Construction method for seamless connection of steel-concrete trestle and earthwork ramp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311868327.6A CN117738065A (en) | 2023-12-29 | 2023-12-29 | Construction method for seamless connection of steel-concrete trestle and earthwork ramp |
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| CN117738065A true CN117738065A (en) | 2024-03-22 |
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