LU102973B1 - Permafrost region road-bridge transition section stiffness balance structure and construction method thereof - Google Patents
Permafrost region road-bridge transition section stiffness balance structure and construction method thereof Download PDFInfo
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- LU102973B1 LU102973B1 LU102973A LU102973A LU102973B1 LU 102973 B1 LU102973 B1 LU 102973B1 LU 102973 A LU102973 A LU 102973A LU 102973 A LU102973 A LU 102973A LU 102973 B1 LU102973 B1 LU 102973B1
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- bridge
- steel plate
- air cushion
- inflatable
- type buffer
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- 230000007704 transition Effects 0.000 title claims abstract description 45
- 238000010276 construction Methods 0.000 title claims abstract description 9
- 239000010410 layer Substances 0.000 claims abstract description 63
- 239000011381 foam concrete Substances 0.000 claims abstract description 32
- 239000004575 stone Substances 0.000 claims abstract description 16
- 239000004744 fabric Substances 0.000 claims abstract description 12
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 239000002344 surface layer Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 91
- 239000010959 steel Substances 0.000 claims description 91
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 16
- 238000013016 damping Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229920003051 synthetic elastomer Polymers 0.000 claims description 7
- 239000005061 synthetic rubber Substances 0.000 claims description 7
- 239000010426 asphalt Substances 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 6
- 238000011065 in-situ storage Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 description 6
- 239000004568 cement Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The present invention relates to a permafrost region road-bridge transition section stiffness balance structure, including a bridge girder body on a bridge side, a bridge pier, a bridge abutment, and an expansion joint. The roadbed side includes a road surface layer, a macadam layer, a block stone layer, a prefabricated foam concrete cushion block, a foam concrete cushion layer, a cushion layer and a foundation arranged sequentially from top to bottom; an inflatable-type buffer support is arranged between the bridge abutment and the bridge girder body; an inflatable-type buffer air cushion is arranged between the prefabricated foam concrete cushion block near the bridge side and the foam concrete cushion layer; the inflatable-type buffer support is connected with the inflatable-type buffer air cushion, and flexible protective cloth is arranged on both edges. The present invention further discloses a construction method of the structure.
Description
PERMAFROST REGION ROAD-BRIDGE TRANSITION SECTION LU102973
STIFFNESS BALANCE STRUCTURE AND CONSTRUCTION METHOD
THEREOF
[01] The present invention relates to the field of the differential settlement control of road-bridge transition sections in permafrost region, in particular to a permafrost region road-bridge transition section stiffness balance structure and a construction method thereof.
[02] In the field of road engineering in permafrost regions, a road-bridge transition section is a relatively special section. In its service process, a bridge abutment is a rigid structure, and its own settlement amount is small, while the stiffness of a roadbed is relatively small, and the change of the stiffness of a foundation is caused by permafrost under the roadbed with the seasonal changes of the temperature, it is easy to cause an uneven settlement problem of the road-bridge transition section under the action of static and dynamic loads of vehicles. Therefore, the permafrost region road-bridge transition section, as a connection portion between the bridge abutment with the larger stiffness and the flexible roadbed, is structurally a point of a sudden change in stiffness and deformation, and is a section that needs to be specially treated, and it is also a key of problems of controlling uneven settlement, and solving bump at a bridge-head and the like.
[03] In view of the above differential settlement problem of the permafrost region road-bridge transition section, a key technical problem to be solved mainly includes: following a principle of protecting the permafrost, and adopting a structure that has less impact on the permafrost under the roadbed; and at the same time, achieving the stiffness balance between the bridge abutment of the road-bridge transition section and the roadbed, as to solve the differential settlement problem. At present, a technical measures taken in differential settlement control aspect of the road-bridge transition section mainly include: (1), using graded gravel mixed with cement or arranging a transition butt strap as a structure of the road-bridge transition section, as to achieve the stiffness matching of the road-bridge transition section; and (2), using a composite foundation to perform the differential settlement control, such as: a lime-soil compaction pile, a high-pressure jet grouting pile and a cement mixing pile. However, the graded gravel mixed with the cement material increase the dead weight of the roadbed. At the same time, the hydration heat generated by the composite foundation material and cement affects the thermal stability of the permafrost under the roadbed, and the settlement amount of the roadbed is further increased; and in the long-term service process of the transition butt strap, the settlement of the roadbed inevitably leads to the cavity of the transition butt strap, and even the fracture of the transition butt strap, so a serious accident may be caused. Therefore, the arrangement of the transition butt strap may not fundamentally solve the differential settlement problem of the road-bridge transition section. Therefore, it is necessary to propose a permafrost region road-bridge 1 transition section stiffness balance structure, which may guarantee the stability of the LU102973 permafrost under the roadbed, and at the same time, may achieve the balance between the bridge abutment of the road-bridge transition section and the stiffness of the roadbed structure, as to solve the differential settlement problem of the road-bridge transition section.
[04] A technical problem to be solved by the present invention is to provide a permafrost region road-bridge transition section stiffness balance structure, which has the strong practicability and reduces the disturbance to permafrost.
[05] Another technical problem to be solved by the present invention is to provide a construction method of the permafrost region road-bridge transition section stiffness balance structure.
[06] In order to solve the above problems, the permafrost region road-bridge transition section stiffness balance structure provided by the present invention includes a bridge girder body on a bridge side, a bridge pier and a bridge abutment arranged below the bridge girder body, and an expansion joint arranged between the bridge side and a roadbed side. The roadbed side includes a road surface layer, a macadam layer, a block stone layer, a prefabricated foam concrete cushion block, a foam concrete cushion layer, a cushion layer and a foundation arranged sequentially from top to bottom; an inflatable-type buffer support is arranged between the bridge abutment and the bridge girder body, the inflatable-type buffer support includes a support upper steel plate and a support lower steel plate; an airbag I is arranged between the support upper steel plate and the support lower steel plate; an inflatable-type buffer air cushion is arranged between the prefabricated foam concrete cushion block near the bridge side and the foam concrete cushion layer, the inflatable-type buffer air cushion includes an air cushion upper steel plate, an air cushion lower steel plate and an air cushion side steel plate; an airbag II is arranged between the air cushion upper steel plate, the air cushion lower steel plate and the air cushion side steel plate; the inflatable-type buffer support is connected with the inflatable-type buffer air cushion, and flexible protective cloth is arranged on both edges; and the airbag I and the airbag II are internally uniformly distributed with a plurality of damping rods and a plurality of memory alloy springs.
[07] The inflatable-type buffer support is connected with the inflatable-type buffer air cushion by a pressure-sensitive two-way valve.
[08] The flexible protective cloth is arranged on the edge of a three-dimensional geometric body formed by the support upper steel plate and the support lower steel plate.
[09] The longitudinal section of a structure formed by the air cushion upper steel plate, the air cushion lower steel plate and the air cushion side steel plate is a right-angled trapezoid, and the flexible protective cloth is arranged around.
[10] Two sides of the air cushion side steel plate are respectively connected with the air cushion upper steel plate and the air cushion lower steel plate by a hinge.
[11] The airbag I is a three-dimensional geometric body made of synthetic rubber that matches with a shape enclosed by the support upper steel plate and the support 2 lower steel plate. LU102973
[12] The airbag II is a three-dimensional geometric body made of the synthetic rubber that matches with a shape enclosed by the air cushion upper steel plate, the air cushion lower steel plate and the air cushion side steel plate.
[13] The plurality of damping rods and the plurality of memory alloy springs are arranged in a staggered mode.
[14] The above construction method of the permafrost region road-bridge transition section stiffness balance structure includes the following steps:
[15] (1) according to a design requirement of a road-bridge transition section, prefabricating a prefabricated foam concrete cushion block of which the shape and size satisfy the design requirement;
[16] (2) according to the design requirement, cutting a steel plate to form a support upper steel plate, a support lower steel plate, an air cushion upper steel plate, an air cushion lower steel plate and an air cushion side steel plate, welding a hinge on corresponding sides of the air cushion upper steel plate, the air cushion lower steel plate and the air cushion side steel plate, installing a damping rod and a memory alloy spring, pasting synthetic rubber to form an airbag I and an airbag II, then installing flexible protective cloth, and inflating the interior of the airbag I and the airbag II by an inflation nozzle, to form an inflatable-type buffer support and an inflatable-type buffer air cushion;
[17] (3) constructing a bridge pier and a bridge abutment on a foundation of the road-bridge transition section; and sloping and excavating the foundation to form a stepped structure on a roadbed side according to a slope of 1:1;
[18] (4) constructing on the abutment back of the bridge abutment by using an asphalt material to form a lower half part of an expansion joint, and then filling and compacting by coarse-grained soil layer by layer to form a cushion layer;
[19] (5) laying a block stone layer contacting with the cushion layer according to a design thickness, and then forming a foam concrete cushion layer with a thickness of 10~15 cm on the block stone layer by an in-situ pouring method;
[20] (6) installing the prefabricated and assembled inflatable-type buffer support above the bridge abutment, and at the same time installing the inflatable-type buffer air cushion above the foam concrete cushion layer near the bridge abutment, and using a pressure-sensitive two-way valve to connect the inflatable-type buffer support and the inflatable-type buffer air cushion; and
[21] (7) after constructing the bridge girder body, using an asphalt material to lay on one end, contacting with the roadbed, of the bridge girder body to form an upper half part of the expansion joint, and laying the prefabricated foam concrete cushion block, the block stone layer, a macadam layer and a road surface layer sequentially from bottom to top.
[22] Compared with the prior art, the present invention has the following advantages:
[23] 1. The present invention aims at the characteristics that the stiffness difference of the road-bridge transition section itself is large and the stiffness of an active layer of the foundation in the permafrost region changes with the temperature and season, the 3 inflatable-type buffer support in which the damping rods and the memory alloy springs LU102973 are arranged is used to replace a traditional bridge support; and at the same time, the inflatable-type buffer support is connected with the inflatable-type buffer air cushion arranged inside the roadbed by the pressure-sensitive two-way valve, so that the air pressure of the inflatable-type buffer support on the bridge side and the inflatable-type buffer air cushion on the road side is balanced, thereby the stiffness balance of the road-bridge transition section structure is achieved.
[24] 2. The present invention exerts a shape memory effect by the memory alloy springs arranged inside the inflatable-type buffer support and inflatable-type buffer air cushion structure, and the shape of the memory alloy springs actively changes with the temperature change, thereby the stiffness change of the inflatable-type buffer support and the inflatable-type buffer air cushion is caused, so the road-bridge transition section structure has the ability of self-adaptive active variable stiffness, which reduces the influence of the stiffness change of the active layer of the foundation with the temperature change.
[25] 3. The block stone layer arranged inside the roadbed of the present invention achieves a function of taking heat inside the roadbed in the process of air circulation, thereby the effect of cooling the roadbed is achieved, and it has little disturbance to the permafrost under the roadbed, which accords with a principle of "protecting frozen soil" in permafrost region engineering construction.
[26] 4. The present invention uses the inflatable-type buffer support to replace a traditional bridge support, which may achieve a function of absorbing and dispersing the seismic impact load, and improve the seismic capacity of the road-bridge transition section structure.
[27] Specific embodiments of the present invention are further described in detail below in combination with drawings.
[28] FIG. 1 is a longitudinal section diagram of the present invention.
[29] FIG. 2 is a schematic diagram of an inflatable-type buffer support and an inflatable-type buffer air cushion in the present invention.
[30] FIG. 3 is an A-A cross-section diagram of the present invention.
[31] FIG. 4 is a B-B cross-section diagram of the present invention.
[32] In the drawings: 1-Bridge girder body, 2-Bridge pier, 3-Bridge abutment, 4-Expansion joint, 5-Road surface layer, 6-Macadam layer, 7-Block stone layer, 801-Prefabricated foam concrete cushion block, 802-Foam concrete cushion layer, 9-Cushion layer, 10-Foundation, 11-Inflatable-type buffer support, 12-Inflatable-type buffer air cushion, 13-Support upper steel plate, 14-Support lower steel plate, 15-Air cushion upper steel plate, 16-Air cushion lower steel plate, 17-Air cushion side steel plate, 18-Hinge, 19-Flexible protective cloth, 201-Airbag I, 202-Airbag II, 21-Damping rod, 22-Memory alloy spring, and 23-Pressure-sensitive two-way valve.
[33] As shown in FIGS. 1-4, a permafrost region road-bridge transition section 4 stiffness balance structure includes a bridge girder body 1 on a bridge side, a bridge pier LU102973 2 and a bridge abutment 3 arranged below the bridge girder body 1, and an expansion joint 4 arranged between the bridge side and a roadbed side.
[34] The roadbed side includes a road surface layer 5, a macadam layer 6, a block stone layer 7, a prefabricated foam concrete cushion block 801, a foam concrete cushion layer 802, a cushion layer 9 and a foundation 10 arranged sequentially from top to bottom; an inflatable-type buffer support 11 is arranged between the bridge abutment 3 and the bridge girder body 1, the inflatable-type buffer support 11 includes a support upper steel plate 13 and a support lower steel plate 14; an airbag I 201 is arranged between the support upper steel plate 13 and the support lower steel plate 14; an inflatable-type buffer air cushion 12 is arranged between the prefabricated foam concrete cushion block 801 near the bridge side and the foam concrete cushion layer 802, the inflatable-type buffer air cushion 12 includes an air cushion upper steel plate 15, an air cushion lower steel plate 16 and an air cushion side steel plate 17; an airbag II 202 is arranged between the air cushion upper steel plate 15, the air cushion lower steel plate 16 and the air cushion side steel plate 17; the inflatable-type buffer support 11 is connected with the inflatable-type buffer air cushion 12, and flexible protective cloth 19 is arranged on both edges; and the airbag I 201 and the airbag II 202 are internally uniformly distributed with a plurality of damping rods 21 and a plurality of memory alloy springs 22.
[35] The inflatable-type buffer support 11 is connected with the inflatable-type buffer air cushion 12 by a pressure-sensitive two-way valve 23.
[36] The flexible protective cloth 19 is arranged on the edge of a three-dimensional geometric body formed by the support upper steel plate 13 and the support lower steel plate 14.
[37] The longitudinal section of a structure formed by the air cushion upper steel plate 15, the air cushion lower steel plate 16 and the air cushion side steel plate 17 is a right-angled trapezoid, and the flexible protective cloth 19 is arranged around.
[38] Two sides of the air cushion side steel plate 17 are respectively connected with the air cushion upper steel plate 15 and the air cushion lower steel plate 16 by a hinge 18.
[39] The airbag I 201 is a three-dimensional geometric body made of synthetic rubber that matches with a shape enclosed by the support upper steel plate 13 and the support lower steel plate 14.
[40] The airbag II 202 is a three-dimensional geometric body made of the synthetic rubber that matches with a shape enclosed by the air cushion upper steel plate 15, the air cushion lower steel plate 16 and the air cushion side steel plate 17.
[41] The plurality of damping rods 21 and the plurality of memory alloy springs 22 are arranged in a staggered mode.
[42] The thickness of the block stone layer 7 is 50 cm~150 cm.
[43] The prefabricated foam concrete cushion block 801 is formed by splicing blocks formed by a prefabrication method according to the shape of the inflatable-type buffer air cushion 12, and its maximum thickness is 1 m.
[44] The foam concrete cushion layer 802 is formed by an in-situ pouring method,
and its thickness is 10-15 cm. LU102973
[45] The cushion layer 9 is formed by layer-by-layer compaction of coarse-grained soil.
[46] The shape of the memory alloy spring 22 may be changed with the temperature.
While the air temperature drops below 0°C, the active layer of the foundation is frozen, the stiffness is increased, the air volume in the airbag is shrunk, the memory alloy spring 22 is extended, and because its displacement is restrained, certain stiffness is additionally added to the inflatable-type buffer support 11 and the inflatable-type buffer air cushion 12, and the stiffness difference of the road-bridge transition section is reduced; and while the air temperature is higher than 0°C, the active layer of the foundation is melted, the stiffness is decreased, the memory alloy spring 22 is shortened, and because its displacement is restrained, the stiffness of the inflatable-type buffer support 11 and the inflatable-type buffer air cushion 12 is reduced, thereby the stiffness difference of the road-bridge transition section is reduced.
[47] A construction method of the permafrost region road-bridge transition section stiffness balance structure includes the following steps:
[48] (1) according to a design requirement of a road-bridge transition section, prefabricating a prefabricated foam concrete cushion block 801 of which the shape and size satisfy the design requirement;
[49] (2) according to the design requirement, cutting a steel plate to form a support upper steel plate 13, a support lower steel plate 14, an air cushion upper steel plate 15, an air cushion lower steel plate 16 and an air cushion side steel plate 17, welding a hinge 18 on corresponding sides of the air cushion upper steel plate 15, the air cushion lower steel plate 16 and the air cushion side steel plate 17, installing a damping rod 21 and a memory alloy spring 22, pasting synthetic rubber to form an airbag I 201 and an airbag II 202, then installing flexible protective cloth 19, and inflating the interior of the airbag I 201 and the airbag II 202 by an inflation nozzle, to form an inflatable-type buffer support 11 and an inflatable-type buffer air cushion 12;
[50] (3) constructing a bridge pier 2 and a bridge abutment 3 on a foundation of the road-bridge transition section; and sloping and excavating the foundation 10 to form a stepped structure on a roadbed side according to a slope of 1:1; [S1] (4) constructing on the abutment back of the bridge abutment 3 by using an asphalt material to form a lower half part of an expansion joint 4, and then filling and compacting by coarse-grained soil layer by layer to form a cushion layer 9; [S2] (5) laying a block stone layer 7 contacting with the cushion layer 9 according to a design thickness, and then forming a foam concrete cushion layer 802 with a thickness of 10~15 cm on the block stone layer 7 by an in-situ pouring method; [S3] (6) installing the prefabricated and assembled inflatable-type buffer support 11 above the bridge abutment 3, and at the same time installing the inflatable-type buffer air cushion 12 above the foam concrete cushion layer 802 near the bridge abutment 3, and using a pressure-sensitive two-way valve 23 to connect the inflatable-type buffer support 11 and the inflatable-type buffer air cushion 12; and
[54] (7) after constructing the bridge girder body 1, using an asphalt material to lay on one end, contacting with the roadbed, of the bridge girder body 1 to form an upper 6 half part of the expansion joint 4, and laying the prefabricated foam concrete cushion LU102973 block 801, the block stone layer 7, a macadam layer 6 and a road surface layer 5 sequentially from bottom to top.
7
Claims (5)
1. A permafrost region road-bridge transition section stiffness balance structure, comprising a bridge girder body (1) on a bridge side, a bridge pier (2) and a bridge abutment (3) arranged below the bridge girder body (1), and an expansion joint (4) arranged between the bridge side and a roadbed side, characterized in that: the roadbed side comprises a road surface layer (5), a macadam layer (6), a block stone layer (7), a prefabricated foam concrete cushion block (801), a foam concrete cushion layer (802), a cushion layer (9) and a foundation (10) arranged sequentially from top to bottom; an inflatable-type buffer support (11) is arranged between the bridge abutment (3) and the bridge girder body (1), the inflatable-type buffer support (11) comprises a support upper steel plate (13) and a support lower steel plate (14); an airbag I (201) is arranged between the support upper steel plate (13) and the support lower steel plate (14); an inflatable-type buffer air cushion (12) is arranged between the prefabricated foam concrete cushion block (801) near the bridge side and the foam concrete cushion layer (802), the inflatable-type buffer air cushion (12) comprises an air cushion upper steel plate (15), an air cushion lower steel plate (16) and an air cushion side steel plate (17); an airbag II (202) is arranged between the air cushion upper steel plate (15), the air cushion lower steel plate (16) and the air cushion side steel plate (17); the inflatable-type buffer support (11) is connected with the inflatable-type buffer air cushion (12), and flexible protective cloth (19) is arranged on both edges; and the airbag I (201) and the airbag II (202) are internally uniformly distributed with a plurality of damping rods (21) and a plurality of memory alloy springs (22).
2. The permafrost region road-bridge transition section stiffness balance structure according to claim 1, characterized in that: the inflatable-type buffer support (11) is connected with the inflatable-type buffer air cushion (12) by a pressure-sensitive two-way valve (23).
3. The permafrost region road-bridge transition section stiffness balance structure according to claim 1, characterized in that: two sides of the air cushion side steel plate (17) are connected with the air cushion upper steel plate (15) and the air cushion lower steel plate (16) respectively by a hinge (18).
4. The permafrost region road-bridge transition section stiffness balance structure according to claim 1, characterized in that: the plurality of damping rods (21) and the plurality of memory alloy springs (22) are arranged in a staggered mode.
5. A construction method of the permafrost region road-bridge transition section stiffness balance structure according to claim 1, characterized by comprising the following steps: (1) according to a design requirement of a road-bridge transition section, prefabricating a prefabricated foam concrete cushion block (801) of which the shape and size satisfy the design requirement; (2) according to the design requirement, cutting a steel plate to form a support upper steel plate (13), a support lower steel plate (14), an air cushion upper steel plate (15), an air cushion lower steel plate (16) and an air cushion side steel plate (17), welding a hinge (18) on corresponding sides of the air cushion upper steel plate (15), 1 the air cushion lower steel plate (16) and the air cushion side steel plate (17), installing a LU102973 damping rod (21) and a memory alloy spring (22), pasting synthetic rubber to form an airbag I (201) and an airbag II (202), then installing flexible protective cloth (19), and inflating the interior of the airbag I (201) and the airbag II (202) by an inflation nozzle,
to form an inflatable-type buffer support (11) and an inflatable-type buffer air cushion
(12);
(3) constructing a bridge pier (2) and a bridge abutment (3) on a foundation of the road-bridge transition section; and sloping and excavating the foundation (10) to form a stepped structure on a roadbed side according to a slope of 1:1;
(4) constructing on the abutment back of the bridge abutment (3) by using an asphalt material to form a lower half part of an expansion joint (4), and then filling and compacting by coarse-grained soil layer by layer to form a cushion layer (9);
(5) laying a block stone layer (7) contacting with the cushion layer (9) according to a design thickness, and then forming a foam concrete cushion layer (802) with a thickness of 10-15 cm on the block stone layer (7) by an in-situ pouring method;
(6) installing the prefabricated and assembled inflatable-type buffer support (11) above the bridge abutment (3), and at the same time installing the inflatable-type buffer air cushion (12) above the foam concrete cushion layer (802) near the bridge abutment (3), and using a pressure-sensitive two-way valve (23) to connect the inflatable-type buffer support (11) and the inflatable-type buffer air cushion (12); and
(7) after constructing the bridge girder body (1), using an asphalt material to lay on one end, contacting with the roadbed, of the bridge girder body (1) to form an upper half part of the expansion joint (4), and laying the prefabricated foam concrete cushion block (801), the block stone layer (7), a macadam layer (6) and a road surface layer (5) sequentially from bottom to top.
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU102973A LU102973B1 (en) | 2022-06-30 | 2022-06-30 | Permafrost region road-bridge transition section stiffness balance structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU102973A LU102973B1 (en) | 2022-06-30 | 2022-06-30 | Permafrost region road-bridge transition section stiffness balance structure and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU102973B1 true LU102973B1 (en) | 2024-01-09 |
Family
ID=89473744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU102973A LU102973B1 (en) | 2022-06-30 | 2022-06-30 | Permafrost region road-bridge transition section stiffness balance structure and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU102973B1 (en) |
-
2022
- 2022-06-30 LU LU102973A patent/LU102973B1/en active
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