CN215561875U - TBM transition area viaduct pier protective structure - Google Patents
TBM transition area viaduct pier protective structure Download PDFInfo
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- CN215561875U CN215561875U CN202121855563.0U CN202121855563U CN215561875U CN 215561875 U CN215561875 U CN 215561875U CN 202121855563 U CN202121855563 U CN 202121855563U CN 215561875 U CN215561875 U CN 215561875U
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Abstract
The utility model provides a protective structure for a viaduct pier in a TBM transition area. Protective structure is including enclosing barricade, backfill the back pressure filling layer in the barricade outside and setting up the barricade basis in the barricade bottom of establishing around the viaduct pier, barricade basis is with the reinforced concrete structure of building around the cushion cap after the pile-up digging establishes around the pier cushion cap, and its width more than or equal to 1.5m, barricade and barricade basis an organic whole are pour and are formed, and its wall is outer to be 1 ~ 1.5m along the distance apart from pier cushion cap edge, back pressure backfill layer is through the layering backfill form, and its height of backfilling highly equals or is greater than the barricade. The utility model has simple structure and convenient construction, and the protective structure can protect the viaduct bridge piers in the TBM rotating field area, thereby avoiding the damage to the erected viaduct bridge piers in the earth excavation, backfilling and other construction processes of the foundation in the area and influencing the stability of the viaduct bridge piers.
Description
Technical Field
The utility model relates to the field of shield construction, in particular to a protective structure for a viaduct pier in a TBM transition area.
Background
The full face tunnel boring machine includes two types, one is a rock boring machine (TBM), and the other is a shield machine. The hard rock TBM is suitable for hard rock tunneling of mountain tunnels, replaces the traditional drilling and blasting method, and has the tunneling speed of 4-10 times that of the conventional drilling and blasting method under the same condition, and the optimal daily footage can reach 40 m; has the advantages of rapidness, high quality, safety, economy, environmental protection, labor protection and the like.
In the construction process of the hard rock TBM, after one mountain tunnel is completed, the mountain tunnel needs to be transferred to an initial port of the next mountain tunnel, because viaducts are often used for connecting the mountain tunnels, in order to improve the construction speed, the construction of the viaduct piers between mountains can be carried out while tunnel excavation is carried out, so that the constructed viaduct piers can exist between the hard rock TBM transfer fields, the TBM transfer field construction is complex, the requirement on the bearing capacity of a transfer field area is high, a station passing platform needs to be built, the excavation and backfilling work of earthwork can often occur, the constructed viaduct piers can be influenced in the earthwork excavation backfilling and platform building process, and the construction process of the later-stage viaduct can be influenced.
Disclosure of Invention
The utility model provides a protective structure for the bridge piers of a viaduct in a TBM transfer area, which can avoid the problems that the bridge piers of the viaduct are damaged and the stability of the bridge piers is influenced in the work of foundation treatment, earth excavation and backfilling, platform erection and the like in the area, and the like in order to avoid the influence on the bridge piers of the constructed viaduct in the TBM transfer construction process.
In order to achieve the technical effect, the utility model provides a protective structure for a pier of an viaduct in a TBM transition area, which is characterized in that: protective structure is including enclosing barricade, backfill the back pressure filling layer and the barricade basis of setting in the barricade bottom of establishing around the viaduct pier, the barricade basis is with the reinforced concrete structure of building around the cushion cap after the pile foundation is established to fill out around the pier cushion cap, and its width more than or equal to 1.5m, barricade and barricade basis an organic whole are pour and are formed, and its wall is outer to be followed the distance apart from pier cushion cap edge and be 1 ~ 1.5m, back pressure backfill layer is backfilled through the layering and is formed, and individual layer backfill thickness is less than 0.5m, and its height of backfilling highly equals or is greater than the barricade.
The utility model has the following excellent technical scheme: the bottom of barricade basis is equipped with thickness 10 ~ 15 cm's reinforced concrete bed course, the distance of the outer fringe of bed course to barricade basis outer fringe is greater than 80 cm.
The utility model has the following excellent technical scheme: the top surface of the retaining wall foundation is flush with the top surface of the bridge pier bearing platform, the height of the retaining wall foundation is 0.5-0.6 m, and the width of the retaining wall foundation is 1.5-2 m; the thickness of the retaining wall is 0.3-0.4 m, and the height of the retaining wall is matched with the height of a bridge pier of the viaduct.
The utility model has the following excellent technical scheme: the main rib of the retaining wall is
The screw-thread steel has the space of 20cm and the distribution ribs of
Screw thread steel with the space of 20cm and the lacing wire of
Round steel is arranged in a rectangle with the space of 40 multiplied by 40 cm; overlap joint of steel bar binding jointThe length is not less than 30cm, the steel bar binding joints in the same section are staggered by 50%, and the length of the staggered section is not less than 1.3 times of the lap joint length.
The utility model has the following excellent technical scheme: the retaining wall and the retaining wall foundation are both formed by pouring C30 concrete, the slump of the concrete is controlled to be 180-220mm, and the concrete is tamped by an inserted vibrator; and pouring the retaining wall layer by layer, wherein each layer is 30-40 cm.
The utility model has the following excellent technical scheme: the top surfaces of the pier bearing platform and the retaining wall foundation are 0.6-1 m lower than the ground surface.
The utility model has simple structure and convenient construction, and the protective structure can protect the viaduct bridge piers in the TBM rotating field area, thereby avoiding the damage to the erected viaduct bridge piers in the earth excavation, backfilling and other construction processes of the foundation in the area and influencing the stability of the viaduct bridge piers.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a cross-sectional view AA of fig. 1.
In the figure: the method comprises the following steps of 1-viaduct bridge pier, 2-retaining wall, 3-back pressure filling layer, 4-retaining wall foundation, 5-bridge pier bearing platform, 6-cushion layer and 7-foundation soil layer.
Detailed Description
The utility model is further illustrated by the following figures and examples. Fig. 1 to 2 are drawings of embodiments, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the present invention. The following claims presented in the drawings are specific to embodiments of the utility model and are not intended to limit the scope of the claimed invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The embodiment provides a regional overpass pier protective structure of TBM transition, as shown in fig. 1 and fig. 2, including enclosing barricade 2, the back pressure fill layer 3 of backfilling in the barricade 2 outside and the barricade basis 4 of setting in barricade 2 bottom of establishing around overpass pier 1, barricade basis 4 is the reinforced concrete structure who constructs around cushion cap 5 after establishing with filling and digging around pier cushion cap 5, pier cushion cap 5 and barricade basis 4 top surface all are less than ground face 0.6 ~ 1m, the top surface of barricade basis 4 and the top surface parallel and level of pier cushion cap 5, its width is 1.5m, and highly is 0.5m, and the bottom of barricade basis 4 is equipped with the reinforced concrete bed course 6 of thickness 10cm, the distance of the outer fringe of bed course 6 to barricade basis 4 outer fringe is greater than 80 cm. The thickness of barricade 2 is 0.3m, highly and 1 high phase-match of overpass pier, and barricade 2 pours with barricade basis 4 an organic whole and forms, and its wall is outer along being 1m apart from 5 marginal distances in pier cushion cap, back pressure backfill layer 3 is backfilled through the layering and forms, and individual layer backfill thickness is less than 50cm, and its backfill height equals or is greater than the height of barricade 2.
The embodiment provides a TBM transition area viaduct pier protective structure, wherein the retaining wall 2 and the retaining wall foundation 4 are both formed by pouring C30 concrete, the slump of the concrete is controlled to be 180-220mm, and the inserted vibrator is used for tamping. The main ribs of the retaining wall 2 are
The screw-thread steel has the space of 20cm and the distribution ribs of
Screw thread steel with the space of 20cm and the lacing wire of
Round steel is arranged in a rectangle with the space of 40 multiplied by 40 cm; the overlapping length of the steel bar binding joints is not less than 30cm, the steel bar binding joints in the same section are staggered by 50%, and the length of the staggered section is not less than 1.3 times of the overlapping length.
The utility model will be further described with reference to the construction process of the embodiment, which is directed to a tunnel construction project in a mountain area, wherein after one mountain tunnel is excavated, the project needs to be transferred to the initial end of an adjacent mountain, so that the foundation of a transfer area needs to be processed, then a transfer platform is set up, since the tunnels in mountain areas are connected through viaducts, in order to accelerate the construction period, the viaduct piers are constructed simultaneously during the tunneling process, so that when the foundation of the transfer area is processed, the viaduct piers already constructed exist in the area, in order to avoid the influence of the construction on the viaduct piers, before the construction, the viaduct piers need to be protected, in consideration of the remaining retaining wall of the later-stage viaduct construction site, the wall body expands outwards by 1m along the side line of the bearing platform, and the width of the retaining wall foundation is 1.5m, the height is 0.5m, the top surface is flush with the top surface of the bearing platform, the wall thickness is 0.3m, the height is set according to the height of the viaduct pier 1, backfill soil is adopted to carry out back pressure on the outer side of the retaining wall after the construction is finished so as to reduce the shearing force on the retaining wall structure when the TBM shield passes through the station, and the structural diagram of the retaining wall construction is shown in fig. 1 and 2. The concrete construction process is as follows:
(1) the excavation range of the foundation of the basement excavation retaining wall is originally backfill around a bearing platform, the excavation is planned to be put into a PC200 crusher and a PC200 excavator respectively, the layered excavation is carried out, the excavation elevation is 60cm below the top of the bearing platform, the excavation range is designed by considering the erection range of a retaining wall door type scaffold, the stratum condition is observed at any time in the excavation process, if the stratum is in a bad stratum, the downward excavation is continued until the stratum soil quality is a solid surface, then the layered backfilling is carried out, the thickness of a single layer is less than or equal to 50cm, and the tamping machine is adopted for tamping after the manual leveling;
(2) construction of the underlayment 6The cushion layer 6 is cast by C20 common concrete, the thickness is 10cm, the elevation of the cast surface is 50cm below the elevation of the top surface of the bearing platform, the later-stage door type scaffold is considered to be erected, the casting range is more than or equal to 80cm along the outside of the retaining wall foundation, a total station is adopted to loft the corner points and elevation mark points of the cushion layer, double-layer 50 multiplied by 90mm square timbers are installed to be used as side forms, and the two sides of the square timbers are implanted into the foundation
The deformed steel bars are used for fixing the side die, the implantation depth is more than or equal to 30cm, the side die is guaranteed not to slide and deform in the pouring process, the elevation of the pouring surface is rechecked immediately after pouring is finished, and the surface is manually wiped and leveled;
(3) after the strength of the cushion layer reaches 2.5MPa, the retaining wall steel bars begin to be constructed, and the retaining wall main steel bars are
The screw-thread steel has the space of 20cm and the distribution ribs of
Screw thread steel with the space of 20cm and the lacing wire of
Round steel, the interval 40X 40cm rectangle is arranged, and the reinforcement joint should accord with following requirement:
firstly, at least 3 parts of the center and two ends of the lap joint part of the steel bars are bound and firmed by binding wires.
And the minimum lap length of the tensioned steel bar binding joint is more than or equal to 45d and not less than 30cm, and the minimum lap length of the compressed steel bar binding joint is more than or equal to 32d (d is the diameter of the steel bar).
Thirdly, the steel bar binding joints in the same section are staggered by 50 percent, and the length of the staggered section is not less than 1.3 times of the lap joint length.
(4) The retaining wall foundation 4 and the wall body template are made of bamboo plywood with the thickness of 15mm, the template is cleaned and washed before use, and then a release agent is coated, so that hoisting, binding and the like during use are avoided,And after the template is used, cleaning and washing sundries and concrete slag remained on the template surface layer, checking whether the quality condition of the template meets the requirement or not, and scrapping unqualified templates. Template reinforcement adopts
The double-spliced steel pipe is used as a main edge, the vertical distance is 50cm, the 50 multiplied by 90mm double-spliced square wood is used as a secondary edge, the transverse distance is 50cm, and the intersection point of the main edge and the secondary edge adopts
The screw rods are oppositely pulled, and the two sides of the screw rods are respectively butted with the solid ground and the main edge by adopting throwing supports at the interval of 2 m.
(5) The height of the wall body of the retaining wall 2 is matched with that of the viaduct bridge pier 1, the wall body which is smaller than or equal to 3.5m is planned to be formed in one step, the wall body of the retaining wall which is larger than 3.5m is constructed in two sections, the concrete marks of the retaining wall foundation and the wall body are C30, a concrete pouring vehicle is directly abutted to a construction site, an overhead pump is adopted for pouring and feeding, the concrete slump is controlled to be 180-220mm, and the wall body is tamped by an inserted vibrator. When pouring, layered and uniform pouring is adopted, each layer is 30-40cm, each layer is vibrated after pouring, the distance, the depth and the acting time of the vibrating rods inserted into the concrete are taken into consideration during vibrating, the vibrator is vertically inserted into the concrete as much as possible during inserting, and the vibrator is quickly inserted and slowly pulled out; the upper layer concrete is vibrated before the initial setting of the lower layer concrete, and the lower layer concrete is inserted by about 5-10 cm. The duration of vibration at each vibration point is preferably 20 to 30 seconds. Concrete vibration compaction standard: the concrete does not sink any more, no bubbles emerge and the surface is subjected to slurry flooding. In the pouring process, professional technicians should check whether the template is deformed or not, whether the pull rod has a slide wire or not, whether the position of a reserved hole or not, whether the position of an embedded part changes or not and the like by a side station in the whole process, and measure and recheck the flatness and elevation of a contraction surface immediately after pouring is finished.
(6) And (3) removing the formwork and maintaining, removing the formwork after the strength of the poured concrete reaches 75%, carefully removing the formwork during removal to prevent the impact from influencing the appearance quality of the concrete, and cutting off the pull rod by using a hand mill after the removal is finished. And (3) after the concrete is demoulded, watering and curing are carried out, geotextile is laid and cured, watering and curing are carried out every 1 hour, the concrete surface is ensured to be moist, the concrete is prevented from cracking, and the curing time is not less than 7 days. The water for maintenance should meet the requirements of the specification. The watering maintenance should be carried out at proper time intervals according to the temperature condition, the surface is kept moist in the maintenance period, and when the temperature is lower than 5 ℃, the surface is covered for heat preservation, and the watering maintenance is not required.
The above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. The utility model provides a regional overpass pier protective structure of TBM transition which characterized in that: protective structure is including enclosing barricade (2), backfill establish around viaduct pier (1) backpressure earthing filler layer (3) in barricade (2) outside and setting up barricade basis (4) in barricade (2) bottom, barricade basis (4) are with pier cushion cap (5) around fill out the soil and dig the reinforced concrete structure who establishes the back and construct around cushion cap (5), its width more than or equal to 1.5m, barricade (2) and barricade basis (4) integrative the pouring form, and its wall is outer along the distance apart from pier cushion cap (5) edge for 1 ~ 1.5m, backpressure earthing filler layer (3) form through the layering, and individual layer backfill thickness is less than 0.5m, and its backfill height that highly equals or is greater than barricade (2).
2. The protective structure for the pier of the viaduct in the TBM transition area of claim 1, wherein: the bottom of barricade basis (4) is equipped with thickness 10 ~ 15 cm's reinforced concrete bed course (6), the distance of the outer fringe of bed course (6) to barricade basis (4) outer fringe is greater than 80 cm.
3. The viaduct pier protection structure in the TBM transition area according to claim 1 or 2, wherein: the top surface of the retaining wall foundation (4) is flush with the top surface of the pier bearing platform (5), the height of the retaining wall foundation is 0.5-0.6 m, and the width of the retaining wall foundation is 1.5-2 m; the thickness of the retaining wall (2) is 0.3-0.4 m, and the height of the retaining wall is matched with that of the viaduct pier (1).
4. The viaduct pier protection structure in the TBM transition area according to claim 1 or 2, wherein: the main rib of the retaining wall (2) is
16 screw thread steel with the spacing of 20cm and distributed ribs of
14 screw thread steel with the space of 20cm and the lacing wire of
10 round steel bars are arranged in a rectangle with the distance of 40 multiplied by 40 cm; the overlapping length of the steel bar binding joints is not less than 30cm, the steel bar binding joints in the same section are staggered by 50%, and the length of the staggered section is not less than 1.3 times of the overlapping length.
5. The viaduct pier protection structure in the TBM transition area according to claim 1 or 2, wherein: the retaining wall (2) and the retaining wall foundation (4) are both formed by pouring C30 concrete, the slump of the concrete is controlled to be 180-220mm, and the concrete is tamped by an inserted vibrator; and (3) uniformly pouring the retaining wall (2) in a layered mode, wherein the thickness of each layer is 30-40 cm.
6. The viaduct pier protection structure in the TBM transition area according to claim 1 or 2, wherein: the top surfaces of the pier bearing platform (5) and the retaining wall foundation (4) are all lower than the ground surface by 0.6-1 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121855563.0U CN215561875U (en) | 2021-08-10 | 2021-08-10 | TBM transition area viaduct pier protective structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121855563.0U CN215561875U (en) | 2021-08-10 | 2021-08-10 | TBM transition area viaduct pier protective structure |
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- 2021-08-10 CN CN202121855563.0U patent/CN215561875U/en active Active
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