CN111472389A - Open excavation construction method and structure for rebuilding existing tunnel into double-layer tunnel - Google Patents
Open excavation construction method and structure for rebuilding existing tunnel into double-layer tunnel Download PDFInfo
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- CN111472389A CN111472389A CN202010373660.XA CN202010373660A CN111472389A CN 111472389 A CN111472389 A CN 111472389A CN 202010373660 A CN202010373660 A CN 202010373660A CN 111472389 A CN111472389 A CN 111472389A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
Abstract
The invention relates to the technical field of tunnel construction, in particular to an open cut construction method and a structure for rebuilding an existing tunnel into a double-layer tunnel, which comprises the following steps of firstly reinforcing the existing tunnel; then, excavating a foundation pit of the lower layer tunnel downwards in the existing tunnel; and finally, reinforcing the lower layer tunnel and recovering the bottom of the existing tunnel. This application is at first consolidated existing tunnel and then begins to excavate the tunnel from the bottom in existing tunnel downwards, and the protection is consolidated to lower floor's tunnel after the foundation ditch in lower floor's tunnel is accomplished, resumes the bottom in existing tunnel at last. This application is to the place that can't increase the tunnel area and need improve the traffic again, through increasing the tunnel in the lower floor in existing tunnel, is not influencing existing tunnel, and the cost is lower relatively, and rational utilization the space has practiced thrift the land, also can alleviate the influence to ecological environment and peripheral masses' life relatively. The lower-layer tunnel is dug downwards from the bottom of the existing tunnel, so that the space in the existing tunnel is enough, the construction is convenient, and the construction period can be shortened.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to an open cut construction method and structure for rebuilding an existing tunnel into a double-layer tunnel.
Background
The tunnel is an engineering building buried in the ground, is a form of underground space utilization by human beings, and has special significance in the aspect of railway and highway construction. Existing built existing tunnels are mostly single-layer tunnels, and in order to relieve traffic, the existing tunnels need to be rebuilt, and if the existing tunnels are added, the occupied area of the tunnels needs to be increased. The urban area of the high-density high-rise building is influenced by environmental factors, a new tunnel cannot be transversely added, and the tunnel needs to be excavated at the lower part of the existing tunnel.
The distance between the bottom of the upper-layer tunnel and the top of the lower-layer tunnel is 2-3 times of the diameter of the tunnel; the distance between the bottom of the upper-layer tunnel and the top of the lower-layer tunnel is 2-3 m; when the tunnel is excavated, the closer the lower layer tunnel is to the upper layer tunnel, the shallower the downward excavation depth is, the lower the cost is, and the farther the cost is. The existing upper and lower non-separated tunnels are directly built at one time, namely, a deeper tunnel is excavated firstly, then the foundation of the lower tunnel is built, and finally the foundation of the upper tunnel is built.
If the up-down separated tunnel is excavated at a distance far from the existing tunnel, the deep excavation cost is high because the distance from the top to the bottom of the existing tunnel is far. Therefore, it is urgently needed to provide a method for building a non-separated tunnel which is close to the existing tunnel in the vertical direction on the basis of the existing tunnel.
Disclosure of Invention
The invention provides an open cut construction method for rebuilding an existing tunnel into a double-layer tunnel, aiming at solving the problem that the cost is higher when a vertical separation type tunnel is excavated on the basis of the existing tunnel in order to relieve the traffic.
In order to achieve the above purpose, the invention provides the following technical scheme:
on one hand, the application provides an open cut construction method for rebuilding an existing tunnel into a double-layer tunnel, which comprises the steps of firstly reinforcing the existing tunnel; then, crushing the bottom of the existing tunnel, and downwards excavating a foundation pit of the lower layer tunnel from the bottom of the existing tunnel; and then reinforcing the lower layer tunnel, and finally recovering the bottom of the existing tunnel.
Preferably, the step of reinforcing the existing tunnel comprises the steps of drilling a plurality of pile holes obliquely downwards along the short side wall of the existing tunnel, and pouring reinforced concrete into the pile holes to form a pile foundation. Existing tunnels are reinforced through pile foundations, and influence on the existing tunnels when lower tunnels are excavated subsequently is reduced as far as possible. The pile foundations on both sides form a platform to support the existing tunnel, thereby preventing the ground of the existing tunnel from collapsing when the lower layer tunnel is excavated. One end of the foundation is fixed with soil or rock stratum, and the pile foundation is cast in situ by reinforced concrete, so that compared with the prior reinforced column which is directly installed, the cast in situ reinforced concrete is firmly grasped with soil rock and rock around the pile hole, and the provided force is larger and more stable.
Preferably, the step of reinforcing the existing tunnel further comprises the step of drilling an anchor cable hole obliquely upwards at the position of the short side wall of the existing tunnel, and constructing an anchor cable in the anchor cable hole. The anchor cables on the two sides prevent the existing tunnel from collapsing in a pulling mode, an upward pulling force is formed on the existing tunnel by adding the anchor cables, and the existing tunnel is prevented from collapsing through the pulling force.
Preferably, pile holes are arranged at equal intervals along the length direction of the existing tunnel low side wall, and the interval between the pile holes is 3-5 m; the diameter of the pile hole is 200-400 mm; the length of the pile hole is 1-2 times of the diameter of the existing tunnel. Pile holes are arranged at equal intervals, so that the stress of the existing tunnel is uniform.
Preferably, the angle α between the stake hole and the horizontal is 45-50 °.
Preferably, the anchor cable holes correspond to the pile holes one to one; the diameter of the anchor cable hole is 50-100 mm; the length of the anchor cable hole is 1-2 times of the diameter of the existing tunnel. Firstly, drilling an anchor cable hole, then fixing one end of the anchor cable in the soil or rock stratum, and connecting the other end of the anchor cable with the existing tunnel short side wall.
Preferably, the anchor cable holes are at an angle β of 30-60 ° to the horizontal.
Preferably, the step of reinforcing the lower-layer tunnel comprises the steps of constructing a bottom cushion layer of the lower-layer tunnel and primary support of the lower-layer tunnel on the lower-layer tunnel; then, sequentially constructing a lower-layer tunnel bottom waterproof plate, a lower-layer tunnel bottom plate, a lower-layer tunnel short side wall and a lower-layer tunnel secondary lining on the lower-layer tunnel; constructing a lower tunnel top waterproof plate and a lower tunnel top cushion layer on the top of the lower tunnel, and then backfilling above the lower tunnel top cushion layer; and finally, recovering the existing tunnel cushion layer, the existing tunnel waterproof plate and the existing tunnel bottom plate in sequence. The bottom of the existing tunnel is recovered after the lower-layer tunnel is reinforced, so that construction is completed, the use space can be increased under the condition that the land area is not increased, and traffic is relieved.
On the other hand, this application still provides an existing tunnel rebuilds open cut structure for double-deck tunnel, including existing tunnel and lower floor's tunnel, the short side wall in existing tunnel is established and has been seted up the stake hole, the pile hole intussuseption is filled with the pile foundation of concrete, be equipped with the anchor rope hole on the short side wall slant in existing tunnel, be equipped with the anchor rope in the anchor rope hole, the anchor rope hole with stake hole one-to-one.
Compared with the prior art, the invention has the beneficial effects that: this application is through excavation and the lower floor tunnel of existing tunnel upper and lower non-disconnect-type on the basis in existing tunnel, at first consolidates existing tunnel then begins the excavation tunnel from the side in tunnel, consolidates the protection to newly excavating the lower floor tunnel at last. This application is to the place that can't increase the tunnel area and need improve the traffic again, through increasing the tunnel in the lower floor in existing tunnel, is not influencing existing tunnel, and the cost is lower relatively, and rational utilization the space has practiced thrift the land, also can alleviate the influence to ecological environment and peripheral masses' life relatively. The lower-layer tunnel is dug downwards from the bottom of the existing tunnel, so that the space in the existing tunnel is enough, the construction is convenient, and the construction period can be shortened.
Description of the drawings:
FIG. 1 is a schematic diagram of an existing tunnel structure;
FIG. 2 is a schematic structural diagram of a lower tunnel excavated on the basis of an existing tunnel;
FIG. 3 is a partial structural schematic view of a double-layer tunnel provided in the present application;
fig. 4 is a schematic structural diagram of a double-layer tunnel provided in the present application.
The labels in the figure are: 1-existing tunnel cavern, 11-existing tunnel secondary lining, 12-existing tunnel primary support, 13-existing tunnel waterproof board, 14-existing tunnel short side wall, 3-pile hole, 4-pile foundation, 5-anchor cable hole, 6-anchor cable, 7-lower tunnel, 81-lower tunnel bottom cushion layer, 82-lower tunnel primary support, 91-lower tunnel bottom board, 92-lower tunnel secondary lining, 93-lower tunnel waterproof board, 94-lower tunnel short side wall, 111-backfill soil, 112-existing tunnel cushion layer, 113-existing tunnel waterproof board, 114-existing tunnel bottom board.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1, the existing tunnel comprises an existing tunnel cavern 1, an existing tunnel secondary lining 11, an existing tunnel primary support 12, an existing tunnel waterproof board 13 and a tunnel short side wall 14.
Example one
As shown in fig. 2, the existing tunnel is first reinforced, then the lower tunnel 7 is gradually excavated downwards from the bottom of the existing tunnel after the bottom of the existing tunnel is crushed, and finally the lower tunnel 7 is reinforced and the bottom of the existing tunnel is restored.
When the existing tunnel is reinforced, firstly, the pile holes 3 are drilled along the length direction of the short side wall 14 of the existing tunnel, the included angle α between the pile holes 3 and the bottom surface of the existing tunnel is 45-50 degrees, the pile holes 3 are arranged at equal intervals, the interval between the adjacent pile holes 3 is 3-5 meters, the diameter of each pile hole 3 is 200-400mm, and the length of each pile hole 3 is 1-2 times of the diameter of the existing tunnel.
After the pile hole 3 is drilled, the reinforced cement concrete is poured into the pile hole 3, the pile foundation 4 is formed after the concrete is dried, the pile foundations 4 on two sides provide an upward force for the existing tunnel, namely the existing tunnel is lifted, and therefore the existing tunnel can be prevented from collapsing.
After protection and reinforcement are carried out on the existing tunnel, the tunnel can be excavated from the end face of the lower-layer tunnel 7 to the middle, in order to save the construction period, the two ends of the tunnel can be excavated to the middle, and after a cavern of the lower-layer tunnel 7 is excavated, a lower-layer tunnel bottom cushion layer 81 and a lower-layer tunnel primary support 82 are firstly constructed on the lower-layer tunnel 7. The method is characterized in that primary support is primary support, after the earthwork is excavated, soil layer stress is released and is easy to deform and collapse, the primary support needs to be constructed in time to support, construction safety is guaranteed, and a working space is provided. Then constructing a lower tunnel bottom plate 91, a lower tunnel short side wall 94 and a lower tunnel secondary lining 92 in sequence, constructing a lower tunnel top waterproof plate 83 and a lower tunnel top cushion layer 84 on the top of the lower tunnel 7 in sequence, and then backfilling soil 111 above the lower tunnel top cushion layer 84; and then restores the existing tunnel mat 112, the existing tunnel waterproof sheet 113 and the existing tunnel floor 114 in sequence.
Example two
As shown in fig. 2, the existing tunnel is first reinforced, then the lower tunnel 7 is gradually excavated downwards from the bottom of the existing tunnel after the bottom of the existing tunnel is crushed, and finally the lower tunnel 7 is reinforced and the bottom of the existing tunnel is restored.
When the existing tunnel is reinforced, firstly, anchor cable holes 5 are drilled in the length direction of the short side walls 14 of the existing tunnel, the included angle β between the anchor cable holes 5 and the bottom surface of the existing tunnel is 30-60 degrees, anchor cables 6 are installed in the anchor cable holes 5, upward tension is formed on the existing tunnel through the anchor cables 6, the hole diameter of each anchor cable hole 5 is 50-100mm, and the length of each anchor cable hole 5 is 1-2 times of the diameter of the existing tunnel.
Existing tunnels are reinforced by protecting and reinforcing the existing tunnels through the short side walls 14, then the existing tunnels can be excavated from the end faces of the lower-layer tunnels 7 to the middle, in order to save the construction period, the existing tunnels can be excavated from two ends to the middle at the same time, and after the caverns of the lower-layer tunnels 7 are excavated, the lower-layer tunnel bottom cushion layer 81 and the lower-layer tunnel primary supports 82 are firstly constructed on the lower-layer tunnels 7. The method is characterized in that primary support is primary support, after the earthwork is excavated, soil layer stress is released and is easy to deform and collapse, the primary support needs to be constructed in time to support, construction safety is guaranteed, and a working space is provided. Then constructing a lower tunnel bottom plate 91, a lower tunnel short side wall 94 and a lower tunnel secondary lining 92 in sequence, constructing a lower tunnel top waterproof plate 83 and a lower tunnel top cushion layer 84 on the top of the lower tunnel 7 in sequence, and then backfilling soil 111 above the lower tunnel top cushion layer 84; and then restores the existing tunnel mat 112, the existing tunnel waterproof sheet 113 and the existing tunnel floor 114 in sequence.
EXAMPLE III
As shown in fig. 2, the existing tunnel is first reinforced, then the lower tunnel 7 is gradually excavated downwards from the bottom of the existing tunnel after the bottom of the existing tunnel is crushed, and finally the lower tunnel 7 is reinforced and the bottom of the existing tunnel is restored.
When the existing tunnel is reinforced, firstly, the pile holes 3 are drilled along the length direction of the short side wall 14 of the existing tunnel, the included angle α between the pile holes 3 and the bottom surface of the existing tunnel is 45-50 degrees, the pile holes 3 are arranged at equal intervals, the interval between the adjacent pile holes 3 is 3-5 meters, the diameter of each pile hole 3 is 200-400mm, and the length of each pile hole 3 is 1-2 times of the diameter of the existing tunnel.
After the pile hole 3 is drilled, the reinforced cement concrete is poured into the pile hole 3, the pile foundation 4 is formed after the concrete is dried, the pile foundations 4 on two sides provide an upward force for the existing tunnel, namely the existing tunnel is lifted, and therefore the existing tunnel can be prevented from collapsing.
The method comprises the steps that anchor cable holes 5 are drilled obliquely upwards at positions corresponding to pile holes 3, the number of the anchor cable holes 5 is as many as that of the pile holes 3, an included angle β between the anchor cable holes 5 and the bottom surface of an existing tunnel is 30-60 degrees, anchor cables 6 are installed in the anchor cable holes 5, an upward tensile force is formed on the existing tunnel through the anchor cables 6, the hole diameter of each anchor cable hole 5 is 50-100mm, and the length of each anchor cable hole 5 is 1-2 times of the diameter of the existing tunnel.
After protection and reinforcement are carried out on the existing tunnel, the tunnel can be excavated from the end face of the lower-layer tunnel 7 to the middle, in order to save the construction period, the two ends of the tunnel can be excavated to the middle, and after a cavern of the lower-layer tunnel 7 is excavated, a lower-layer tunnel bottom cushion layer 81 and a lower-layer tunnel primary support 82 are firstly constructed on the lower-layer tunnel 7. The method is characterized in that primary support is primary support, after the earthwork is excavated, soil layer stress is released and is easy to deform and collapse, the primary support needs to be constructed in time to support, construction safety is guaranteed, and a working space is provided. Then constructing a lower tunnel bottom plate 91, a lower tunnel short side wall 94 and a lower tunnel secondary lining 92 in sequence, constructing a lower tunnel top waterproof plate 83 and a lower tunnel top cushion layer 84 on the top of the lower tunnel 7 in sequence, and then backfilling soil 111 above the lower tunnel top cushion layer 84; and then restores the existing tunnel mat 112, the existing tunnel waterproof sheet 113 and the existing tunnel floor 114 in sequence.
The open cut construction method provided by the application damages the bottom of the existing tunnel when the lower layer tunnel is excavated, and the tunnel is excavated downwards layer by layer on the basis of the existing tunnel, so that the space is enough, the excavation difficulty can be reduced, the excavation time is shortened, and only the bottom of the existing tunnel needs to be recovered at last. Meanwhile, the distance between the lower-layer tunnel and the upper-layer tunnel is close to each other, and the distance between the lower-layer tunnel and the upper-layer tunnel provided by the embodiment is 2-3 meters, so that the cost is relatively low when the lower-layer tunnel is excavated. The existing upper and lower non-separated tunnels are directly built at one time, namely, a deeper tunnel is excavated firstly, then the foundation of the lower tunnel is built, and finally the foundation of the upper tunnel is built. According to the method, the lower-layer tunnel is reconstructed on the basis of the existing tunnel, and the lower-layer tunnel and the existing tunnel are different in sequence.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. An open cut construction method for rebuilding an existing tunnel into a double-layer tunnel is characterized in that the existing tunnel is reinforced, and then a foundation pit of a lower-layer tunnel (7) is excavated downwards from the bottom of the existing tunnel after the bottom of the existing tunnel is crushed; subsequently, the lower tunnel (7) is reinforced, and finally, the bottom of the existing tunnel is recovered.
2. The open-cut construction method for rebuilding an existing tunnel into a double-layer tunnel according to claim 1, wherein the reinforcing of the existing tunnel comprises drilling a plurality of pile holes (3) obliquely downward along the existing tunnel low side walls (14), and pouring reinforced concrete into the pile holes (3) to form the pile foundation (4).
3. The open-cut construction method for rebuilding the existing tunnel into the double-layer tunnel according to claim 2, wherein the reinforcing of the existing tunnel further comprises drilling anchor cable holes (5) obliquely upwards at the low side walls (14) of the existing tunnel, and constructing anchor cables (6) in the anchor cable holes (5).
4. The open-cut construction method for rebuilding an existing tunnel into a double-layer tunnel according to claim 2, wherein pile holes (3) are arranged at equal intervals along the length direction of the existing tunnel short side walls (14), and the interval between the pile holes (3) is 3-5 m; the diameter of the pile hole (3) is 200-400 mm; the length of the pile hole (3) is 1-2 times of the diameter of the existing tunnel.
5. Open-cut construction method for rebuilding of existing tunnel into double-layer tunnel according to claim 4, wherein the angle α between pile hole (3) and horizontal is 45-50 °.
6. The open-cut construction method for rebuilding an existing tunnel into a double-layer tunnel according to claim 3, wherein the anchor cable holes (5) correspond to the pile holes (3) one to one; the diameter of the anchor cable hole (5) is 50-100 mm; the length of the anchor cable hole (5) is 1-2 times of the diameter of the existing tunnel.
7. Open-cut construction method for rebuilding of existing tunnel into double-layer tunnel according to claim 6, wherein the angle β between anchor cable holes (5) and horizontal plane is 30-60 °.
8. The open-cut construction method for rebuilding an existing tunnel into a double-layer tunnel according to claim 1, wherein the reinforcing the lower-layer tunnel (7) comprises constructing a lower-layer tunnel bottom cushion (81) and a lower-layer tunnel primary support (82) on the lower-layer tunnel (7) first; then, constructing a lower-layer tunnel bottom waterproof plate (93), a lower-layer tunnel bottom plate (91), a lower-layer tunnel short side wall (94) and a lower-layer tunnel secondary lining (92) on the lower-layer tunnel (7) in sequence; constructing a lower tunnel top waterproof plate (83) and a lower tunnel top cushion layer (84) on the top of the lower tunnel (7), and then backfilling soil above the lower tunnel top cushion layer (84); and finally, recovering the existing tunnel cushion layer (112), the existing tunnel waterproof plate (113) and the existing tunnel bottom plate (114) in sequence.
9. The utility model provides an existing tunnel rebuilds open cut structure for double-deck tunnel, a serial communication port, including existing tunnel and lower floor tunnel (7), short side wall (14) in existing tunnel are established and have been seted up stake hole (3), the intussuseption of stake hole (3) is filled with the formation pile foundation (4) of concrete, be equipped with anchor rope hole (5) on short side wall (14) slant in existing tunnel, be equipped with anchor rope (6) in anchor rope hole (5), anchor rope hole (5) with stake hole (3) one-to-one.
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| CN202010373660.XA CN111472389B (en) | 2020-05-06 | 2020-05-06 | Open excavation construction method for rebuilding existing tunnel into double-layer tunnel |
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| JP3796524B2 (en) * | 2002-03-25 | 2006-07-12 | 独立行政法人土木研究所 | Tunnel widening method and tunnel |
| CN103953351A (en) * | 2014-05-20 | 2014-07-30 | 长安大学 | Existing tunnel down-digging extension construction method without traffic interruption |
| CN203856477U (en) * | 2014-05-20 | 2014-10-01 | 广西交通科学研究院 | Novel spatial-structure urban tunnel formed by down digging and extension of existing tunnel |
| CN105781571A (en) * | 2016-03-11 | 2016-07-20 | 中交第二公路工程局有限公司 | Construction method for soft rock deformation tunnel lining support dismantling-replacing arch |
| KR20180118009A (en) * | 2017-04-20 | 2018-10-30 | 전영권 | Duplex tunnel construction method |
| KR20190079588A (en) * | 2019-06-21 | 2019-07-05 | 전영권 | Construction Method of Duplex Tunnel |
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2020
- 2020-05-06 CN CN202010373660.XA patent/CN111472389B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3796524B2 (en) * | 2002-03-25 | 2006-07-12 | 独立行政法人土木研究所 | Tunnel widening method and tunnel |
| CN103953351A (en) * | 2014-05-20 | 2014-07-30 | 长安大学 | Existing tunnel down-digging extension construction method without traffic interruption |
| CN203856477U (en) * | 2014-05-20 | 2014-10-01 | 广西交通科学研究院 | Novel spatial-structure urban tunnel formed by down digging and extension of existing tunnel |
| CN105781571A (en) * | 2016-03-11 | 2016-07-20 | 中交第二公路工程局有限公司 | Construction method for soft rock deformation tunnel lining support dismantling-replacing arch |
| KR20180118009A (en) * | 2017-04-20 | 2018-10-30 | 전영권 | Duplex tunnel construction method |
| KR20190079588A (en) * | 2019-06-21 | 2019-07-05 | 전영권 | Construction Method of Duplex Tunnel |
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Address after: 100078 501, 503, 5th floor, building 15, fangchengyuan 1st District, Fengtai District, Beijing Patentee after: CRRC Intelligent Transportation Engineering Technology Co.,Ltd. Patentee after: SUZHOU CHINA VEHICLE CONSTRUCTION ENGINEERING Co.,Ltd. Address before: 100078 501, 503, 5th floor, building 15, fangchengyuan 1st District, Fengtai District, Beijing Patentee before: CRRC CONSTRUCTION ENGINEERING Co.,Ltd. Patentee before: SUZHOU CHINA VEHICLE CONSTRUCTION ENGINEERING Co.,Ltd. |