CN112112194A - Upper and lower blocked open cut tunnel prefabricated lining prestress connecting structure and method - Google Patents
Upper and lower blocked open cut tunnel prefabricated lining prestress connecting structure and method Download PDFInfo
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- CN112112194A CN112112194A CN202010921709.0A CN202010921709A CN112112194A CN 112112194 A CN112112194 A CN 112112194A CN 202010921709 A CN202010921709 A CN 202010921709A CN 112112194 A CN112112194 A CN 112112194A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 238000010276 construction Methods 0.000 claims abstract description 25
- 238000005192 partition Methods 0.000 claims description 28
- 239000003822 epoxy resin Substances 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 9
- 229920000647 polyepoxide Polymers 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 2
- 238000009417 prefabrication Methods 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 3
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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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
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Abstract
The invention belongs to the technical field of underground structural engineering, and particularly relates to an up-and-down blocked open cut tunnel prefabricated lining prestressed connecting structure which is formed by longitudinally splicing multiple ring lining rings; the lining ring comprises a prefabricated lining upper block and a prefabricated lining lower block, and a plurality of vertically-penetrated vertical prestress tensioning holes are correspondingly arranged in a top plate and an upper side wall of the prefabricated lining upper block and a bottom plate and a lower side wall of the prefabricated lining lower block; the same prestressed twisted steel is tensioned in the corresponding vertical prestressed tensioning hole in the vertical direction, and the fine aggregate concrete is injected; the connecting method comprises the steps of firstly completing vertical prestress connection of the prefabricated lining upper block and the prefabricated lining lower block to form a lining ring, then carrying out longitudinal temporary prestress connection on adjacent lining rings, and then removing the temporary prestress connection and carrying out longitudinal permanent prestress connection. The invention can save manpower, shorten construction period, accurately control the stress applied to the prefabricated lining and realize safe and rapid construction of the prefabricated lining.
Description
Technical Field
The invention belongs to the technical field of underground structural engineering, and particularly relates to an up-and-down blocked open-cut tunnel prefabricated lining prestress connecting structure and a method.
Background
At present, in the field of engineering construction, the application of prefabricated parts is more and more extensive, in particular in the fields of buildings, municipal administration and bridges. The prefabricated components are processed in a factory, and the processed components are conveyed to a construction site for hoisting and splicing construction. The construction of the prefabricated parts can reduce the volume of cast-in-place concrete on site and environmental pollution, and can improve the overall construction quality. The construction of the prefabricated parts is critical to how the connection between the adjacent parts is made,
the connection of the prefabricated parts is diversified, the prestressed connection is used as a dry connection form of the prefabricated parts and widely applied to the engineering fields of buildings, bridges, municipal works and the like, and the form has the advantages of high structural connection speed, quick stress on joints without maintenance and the like. The existing tunnel prefabricated lining is mostly connected by bolts. Bolt connection form exists that bolt hand hole is less, and on-the-spot manual work is with torque wrench pretension section of jurisdiction bolt, and intensity of labour is big, and operating time is long, leads to the section of jurisdiction to assemble speed slowly, and then influences shortcomings such as the whole construction progress in tunnel.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the structure and the method for connecting the prefabricated lining of the open-cut tunnel with the upper and lower blocks in a prestressed mode, so that the construction labor is saved, the construction period is shortened, the stress applied to the prefabricated lining is controlled accurately, and the safe and rapid construction of the prefabricated lining can be realized.
In order to achieve the purpose, the technical scheme of the invention is that the connecting structure is formed by longitudinally splicing a plurality of ring lining rings, and the connecting structure is an up-down partitioned open-cut tunnel prefabricated lining prestressed connecting structure; the lining ring comprises a prefabricated lining upper block and a prefabricated lining lower block which are oppositely arranged up and down, the prefabricated lining upper block comprises a top plate and two upper side walls connected with two ends of the top plate, and the prefabricated lining lower block comprises a bottom plate and two lower side walls connected with two ends of the bottom plate; the roof go up the side wall down the side wall with all correspond in the bottom plate and be equipped with a plurality of vertical prestressing force stretch-draw holes that run through vertically, stretch-draw in the vertical prestressing force stretch-draw hole that corresponds vertically has same root prestressing force twisted steel, just it has the pea gravel concreten to press to annotate in the vertical prestressing force stretch-draw hole.
Furthermore, the top plate is also connected with an upper partition plate which is positioned between the two upper side walls; the bottom plate is also connected with a lower partition plate which is positioned between the two lower side walls; the top plate, go up the baffle down the baffle with all correspond in the bottom plate and be equipped with a plurality of vertical prestressing force stretch-draw holes that run through, stretch-draw in the vertical corresponding vertical prestressing force stretch-draw hole in vertical has same root prestressing force twisted steel, just it has the pea gravel concreten to press to annotate in the vertical prestressing force stretch-draw hole.
Furthermore, the top surface of the top plate is provided with first vertical notches corresponding to the vertical prestress tensioning holes, the side surfaces of the lower side walls are provided with second vertical notches corresponding to the vertical prestress tensioning holes, and the side surfaces of the lower partition plate are provided with third vertical notches corresponding to the vertical prestress tensioning holes; the first vertical notch, the second vertical notch and the third vertical notch are communicated with the corresponding vertical prestress tensioning holes and are filled with fine aggregate concrete.
Furthermore, longitudinal prestress tensioning holes which longitudinally penetrate are formed in the top plate, the upper side wall, the lower side wall and the bottom plate of each lining ring, the same permanent prestress steel strand is tensioned in the longitudinal prestress tensioning hole which longitudinally corresponds to each lining ring, and fine aggregate concrete is injected in the longitudinal prestress tensioning hole.
Furthermore, the top surface of the top plate of each lining ring is provided with a first longitudinal notch at a position corresponding to the longitudinal prestress tensioning hole, and the upper side wall, the lower side wall and the bottom plate of each lining ring are provided with a second longitudinal notch at a position corresponding to the longitudinal prestress tensioning hole; the first longitudinal notch and the second longitudinal notch are communicated with the corresponding longitudinal prestress tensioning holes and are filled with fine aggregate concrete.
Furthermore, the longitudinal abutted seam face of the lining ring is brushed with epoxy resin glue.
The invention also provides a method for connecting the prefabricated lining prestress of the open cut tunnel partitioned into the upper part and the lower part, which comprises the following steps:
1) completing the prefabrication of the prefabricated lining upper block and the prefabricated lining lower block, and transporting to an open cut tunnel construction site;
2) splicing the prefabricated lining upper block and the prefabricated lining lower block to form a lining ring;
3) brushing epoxy resin glue on the longitudinal abutted seam surfaces of two adjacent ring lining rings, then penetrating the temporary prestressed steel strand into a longitudinal prestressed tensioning hole at the same point position of the two adjacent ring lining rings, and performing longitudinal temporary prestressed tensioning on the temporary prestressed steel strand through longitudinal notches on the two adjacent ring lining rings;
4) after a plurality of ring lining rings are longitudinally assembled, the temporary prestress connection between two adjacent ring lining rings in each phase in the segment is released, then the permanent prestress steel strands penetrate through longitudinal prestress tensioning holes at the same point position of all the lining rings in the segment, and the permanent prestress steel strands are longitudinally and permanently tensioned through longitudinal notches in the head and tail lining rings;
5) and after the longitudinal permanent prestress tensioning is finished, grouting and plugging all longitudinal prestress tensioning holes in the segments, and sealing the longitudinal notches by adopting fine aggregate concrete.
Further, in the step 3), after the epoxy resin glue is coated, temporary prestress steel strands are respectively penetrated into longitudinal prestress tensioning holes at the same point positions on the top plate, the upper side wall, the lower side wall and the bottom plate of the two adjacent ring lining rings, and the temporary prestress steel strands are longitudinally and temporarily tensioned through the first longitudinal notch on the top plate and the second longitudinal notches on the upper side wall, the lower side wall and the bottom plate of the two adjacent ring lining rings.
Further, the concrete method for splicing the prefabricated lining upper block and the prefabricated lining lower block to form the lining ring in the step 2) comprises the following steps: splicing the prefabricated lining upper block and the prefabricated lining lower block vertically, then penetrating prestressed threaded steel bars into vertically corresponding vertical prestressed tensioning holes of the prefabricated lining upper block and the prefabricated lining lower block, and performing vertical permanent prestressed tensioning on the prestressed threaded steel bars through vertical notches in the prefabricated lining upper block and the prefabricated lining lower block; and after tensioning is finished, grouting and plugging are carried out on all vertical prestress tensioning holes, and the vertical notches are sealed by adopting fine aggregate concrete.
Furthermore, prestressed threaded steel bars penetrate into vertical prestressed tensioning holes vertically corresponding to the top plate, the upper side wall and the bottom plate of the prefabricated lining upper block and the lower side wall, the prestressed threaded steel bars penetrate into vertical prestressed tensioning holes vertically corresponding to the top plate, the upper partition plate and the bottom plate of the prefabricated lining lower block and the upper partition plate of the prefabricated lining upper block, and vertical permanent prestressed tensioning is carried out on the corresponding prestressed threaded steel bars through a first vertical notch in the top plate, a second vertical notch in the lower side wall and a third vertical notch in the lower partition plate.
Compared with the prior art, the invention has the following beneficial effects:
(1) compared with the existing tunnel prefabricated lining connection method, the up-down partitioned open-cut tunnel prefabricated lining prestress connection structure and the method can save construction manpower and shorten construction period, and in the aspect of construction, the magnitude of stress applied to the prefabricated lining is accurately controlled, so that the safe and rapid construction of the prefabricated lining is realized;
(2) the vertical prestress tensioning holes and the longitudinal prestress tensioning holes are reserved on the prefabricated lining upper block and the prefabricated lining lower block, so that the prefabricated lining upper block and the prefabricated lining lower block are connected in a vertical prestress mode, longitudinal prestress connection is conducted between lining rings, and prestress tensioning notches in different forms are reserved on the prefabricated lining upper block and the prefabricated lining lower block, so that prestress tensioning is facilitated; the vertical prestress connection and the longitudinal prestress connection jointly act on the lining rings, and the vertical direction of the lining rings and the adjacent lining rings are respectively tensioned and fastened, so that the integrity of the whole structure is improved;
(3) when longitudinal prestress connection is carried out between lining rings, after the lining rings are assembled, temporary longitudinal prestress connection is firstly carried out on the lining of the ring and the lining of the previous ring, after the temporary longitudinal prestress connection is carried out in such a way that a plurality of ring lining rings are longitudinally assembled to form a lining segment in a circulating way, the temporary longitudinal prestress connection between every two adjacent lining rings in a stage is released one by one in a diagonal form, and all the lining rings in the stage are penetrated through by a whole section of steel stranded wire and are applied with permanent longitudinal prestress to carry out longitudinal permanent prestress connection, so that the longitudinal assembling precision of the lining rings is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a prefabricated lining prestressed connection structure of an open-cut tunnel partitioned into upper and lower blocks according to an embodiment of the present invention;
FIG. 2 is a schematic view of a permanent connection of lining rings provided by an embodiment of the present invention;
FIG. 3 is a schematic illustration of temporary connection of two adjacent ring lining rings provided by an embodiment of the present invention;
in the figure: 1. the prefabricated lining upper block, the prefabricated lining lower block, the prefabricated lining upper block, the prefabricated lining lower block, the prefabricated lining upper block, the prefabricated lining.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 "center", "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 only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, the embodiment provides a prefabricated lining prestressed connecting structure of an open-cut tunnel divided into upper and lower blocks, which is formed by longitudinally splicing multiple ring lining rings; the lining ring comprises a prefabricated lining upper block 1 and a prefabricated lining lower block 2 which are arranged oppositely up and down, the prefabricated lining upper block 1 comprises a top plate and two upper side walls connected with two ends of the top plate, and the prefabricated lining lower block 2 comprises a bottom plate and two lower side walls connected with two ends of the bottom plate; the roof go up the side wall down the side wall with all correspond in the bottom plate and be equipped with a plurality of vertical prestressing force stretch-draw holes 11 that run through vertically, stretch-draw in the vertical prestressing force stretch-draw hole 11 that corresponds vertically has same root prestressing force twisted steel 10, just it has the pea gravel concreten to press the notes in the vertical prestressing force stretch-draw hole 11. The lining ring of the embodiment is formed by splicing the prefabricated lining upper block 1 and the prefabricated lining lower block 2 and then connecting the spliced prefabricated lining upper block and the prefabricated lining lower block through prestress, so that the formwork supporting process can be reduced, the construction space of a lining on site is reduced, the mould, the labor and the construction period are saved, and the safe and rapid construction of the prefabricated lining can be realized; meanwhile, the lining blocks are prefabricated, so that the lining block can be produced on a factory production line, the construction is convenient, the quality is easy to control, the construction influence is small, and the material waste is less.
Furthermore, the top plate is also connected with an upper partition plate which is positioned between the two upper side walls; the bottom plate is also connected with a lower partition plate which is positioned between the two lower side walls; the roof go up the baffle down the baffle with all correspond in the bottom plate and be equipped with a plurality of vertical prestressing force stretch-draw holes 11 that run through, stretch-draw in the vertical corresponding vertical prestressing force stretch-draw hole 11 in vertical has same root prestressing force twisted steel 10, just it has the pea gravel concreten to press the notes in the vertical prestressing force stretch-draw hole 11.
Furthermore, the top surface of the top plate is provided with a first vertical notch 7 corresponding to the vertical prestress tensioning hole 11, the side surface of the lower side wall is provided with a second vertical notch 8 corresponding to the vertical prestress tensioning hole 11, and the side surface of the lower partition plate is provided with a third vertical notch 9 corresponding to the vertical prestress tensioning hole 11; the first vertical notch 7, the second vertical notch 8 and the third vertical notch 9 are communicated with the corresponding vertical prestress tensioning holes 11 and are filled with fine aggregate concrete. As shown in fig. 1, in the present embodiment, the prestressed rebar 10 in the side wall is subjected to vertical permanent prestress tensioning through the first vertical notch 7 on the top plate and the second vertical notch 8 on the lower side wall, and the prestressed rebar 10 in the partition plate is subjected to vertical permanent prestress tensioning through the first vertical notch 7 on the top plate and the third vertical notch 9 on the lower partition plate.
Furthermore, longitudinal prestress tensioning holes 6 which longitudinally penetrate are formed in the top plate, the upper side wall, the lower side wall and the bottom plate of each lining ring, the same permanent prestress steel strand 12 is tensioned in the longitudinal prestress tensioning hole 6 which longitudinally corresponds to each lining ring, and fine aggregate concrete is injected in the longitudinal prestress tensioning holes 6. In the embodiment, the prefabricated lining upper block 1 and the prefabricated lining lower block 2 are connected through vertical prestress to form a lining ring, and all lining rings in the segments are tensioned through the permanent prestress steel strands 12 to be connected through longitudinal permanent prestress, so that the safe and rapid construction of the prefabricated lining is realized.
Furthermore, the top surface of the top plate of each lining ring is provided with a first longitudinal notch 4 corresponding to the longitudinal prestress tensioning hole 6, and the upper side wall, the lower side wall and the bottom plate of each lining ring are provided with a second longitudinal notch 5 corresponding to the longitudinal prestress tensioning hole 6; the first longitudinal notch 4 and the second longitudinal notch 5 are communicated with the corresponding longitudinal prestress tensioning holes 6 and are filled with fine aggregate concrete. In the embodiment, the top plate, the upper side wall, the lower side wall and the bottom plate are respectively subjected to longitudinal prestress tensioning through the first longitudinal notch 4 on the top plate, the second longitudinal notch 5 on the upper side wall, the second longitudinal notch 5 on the lower side wall and the second longitudinal notch 5 on the bottom plate. The longitudinal prestress tensioning comprises temporary longitudinal prestress tensioning and permanent longitudinal prestress tensioning, the top plates, the upper side walls, the lower side walls and the bottom plates of the two adjacent ring lining rings are respectively subjected to temporary prestress tensioning through the first longitudinal notches 4 and the second longitudinal notches 5 on the two adjacent ring lining rings, and after a section is longitudinally assembled, the top plates, the upper side walls, the lower side walls and the bottom plates of all lining rings in the section are subjected to permanent prestress tensioning through the first longitudinal notches 4 and the second longitudinal notches 5 on the section head and tail lining rings.
Furthermore, the longitudinal abutted seam surfaces of the lining rings are brushed with epoxy resin glue to increase the connecting force between the adjacent lining rings.
As shown in fig. 1 to fig. 3, the present embodiment further provides a method for connecting an open cut tunnel prefabricated lining with upper and lower blocks by prestress, which includes the following steps:
1) prefabricating the prefabricated lining upper block 1 and the prefabricated lining lower block 2 in a factory, and transporting to an open cut tunnel construction site;
2) splicing the prefabricated lining upper block 1 and the prefabricated lining lower block 2 to form a lining ring;
the method specifically comprises the following steps: splicing the prefabricated lining upper block 1 and the prefabricated lining lower block 2 vertically, then penetrating prestressed threaded steel bars 10 into vertical prestressed tensioning holes 11 which are vertically corresponding to the prefabricated lining upper block 1 and the prefabricated lining lower block 2, and performing vertical permanent prestressed tensioning on the prestressed threaded steel bars 10 through vertical notches in the prefabricated lining upper block 1 and the prefabricated lining lower block 2 to extrude a prefabricated lining vertical splicing seam 3; and after tensioning is finished, grouting and plugging are carried out on all the vertical prestress tensioning holes 11, and the vertical notches are sealed by adopting fine aggregate concrete.
3) Coating epoxy resin glue on the longitudinal joint faces of two adjacent lining rings to increase the connecting force between the two adjacent lining rings; then, penetrating the temporary prestressed steel strand 14 into the longitudinal prestressed tensioning holes 6 at the same point positions of the two adjacent ring lining rings, and performing longitudinal temporary prestressed tensioning on the temporary prestressed steel strand 14 through longitudinal notches in the two adjacent ring lining rings;
4) after a plurality of ring lining rings are longitudinally assembled, the temporary prestress connection between two adjacent ring lining rings in each phase in the segment is released, then the permanent prestress steel strands 12 penetrate through the longitudinal prestress tensioning holes 6 at the same point position of all the lining rings in the segment, and the permanent prestress steel strands 12 are longitudinally and permanently tensioned through longitudinal notches in the head and tail lining rings;
5) and after the longitudinal permanent prestress tensioning is finished, grouting and plugging all longitudinal prestress tensioning holes 6 in the segments, and sealing the longitudinal notches by adopting fine aggregate concrete.
Further, in the step 3), after the epoxy resin glue is coated, temporary prestressed steel strands 14 are respectively penetrated into longitudinal prestressed tensioning holes 6 at the same point positions on the top plate, the upper side wall, the lower side wall and the bottom plate of the two adjacent ring lining rings, and the temporary prestressed steel strands 14 are longitudinally and temporarily tensioned through first longitudinal notches 4 on the top plate and second longitudinal notches 5 on the upper side wall, the lower side wall and the bottom plate of the two adjacent ring lining rings.
Furthermore, prestressed threaded steel bars 10 penetrate into vertical prestressed tensioning holes 11 which are vertically corresponding to a top plate, an upper side wall and a bottom plate of the prefabricated lining upper block 1 and a prefabricated lining lower block 2 and a lower side wall of the prefabricated lining upper block 1, prestressed threaded steel bars 10 penetrate into vertical prestressed tensioning holes 11 which are vertically corresponding to a top plate, an upper partition plate and a prefabricated lining lower block 2 and an upper partition plate of the prefabricated lining upper block 1, and vertical permanent prestressed tensioning is carried out on the corresponding prestressed threaded steel bars 10 through a first vertical notch 7 on the top plate, a second vertical notch 8 on the lower side wall and a third vertical notch 9 on the lower partition plate.
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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a prefabricated lining prestressed connection structure of open cut tunnel of upper and lower piecemeal which characterized in that: the connecting structure is formed by longitudinally splicing multiple ring lining rings; the lining ring comprises a prefabricated lining upper block and a prefabricated lining lower block which are oppositely arranged up and down, the prefabricated lining upper block comprises a top plate and two upper side walls connected with two ends of the top plate, and the prefabricated lining lower block comprises a bottom plate and two lower side walls connected with two ends of the bottom plate; the roof go up the side wall down the side wall with all correspond in the bottom plate and be equipped with a plurality of vertical prestressing force stretch-draw holes that run through vertically, stretch-draw in the vertical prestressing force stretch-draw hole that corresponds vertically has same root prestressing force twisted steel, just it has the pea gravel concreten to press to annotate in the vertical prestressing force stretch-draw hole.
2. The upper and lower partitioned open-cut tunnel precast lining prestressed connection structure of claim 1, wherein: the top plate is also connected with an upper partition plate which is positioned between the two upper side walls; the bottom plate is also connected with a lower partition plate which is positioned between the two lower side walls; the top plate, go up the baffle down the baffle with all correspond in the bottom plate and be equipped with a plurality of vertical prestressing force stretch-draw holes that run through, stretch-draw in the vertical corresponding vertical prestressing force stretch-draw hole in vertical has same root prestressing force twisted steel, just it has the pea gravel concreten to press to annotate in the vertical prestressing force stretch-draw hole.
3. The upper and lower partitioned open-cut tunnel precast lining prestressed connection structure as set forth in claim 2, wherein: the top surface of the top plate is provided with first vertical notches corresponding to the vertical prestress tensioning holes, the side surfaces of the lower side walls are provided with second vertical notches corresponding to the vertical prestress tensioning holes, and the side surfaces of the lower partition plate are provided with third vertical notches corresponding to the vertical prestress tensioning holes; the first vertical notch, the second vertical notch and the third vertical notch are communicated with the corresponding vertical prestress tensioning holes and are filled with fine aggregate concrete.
4. The upper and lower divided open-cut tunnel precast lining prestressed connection structure of any one of claims 1 to 3, wherein: longitudinal prestress tensioning holes which longitudinally penetrate are formed in the top plate, the upper side wall, the lower side wall and the bottom plate of each lining ring, the same permanent prestress steel strand is tensioned in the longitudinal prestress tensioning hole which longitudinally corresponds to each lining ring, and fine aggregate concrete is injected in the longitudinal prestress tensioning hole.
5. The upper and lower partitioned open-cut tunnel precast lining prestressed connection structure of claim 4, wherein: the top surface of the top plate of each lining ring is provided with a first longitudinal notch corresponding to the longitudinal prestress tensioning hole, and the upper side wall, the lower side wall and the bottom plate of each lining ring are provided with a second longitudinal notch corresponding to the longitudinal prestress tensioning hole; the first longitudinal notch and the second longitudinal notch are communicated with the corresponding longitudinal prestress tensioning holes and are filled with fine aggregate concrete.
6. The upper and lower partitioned open-cut tunnel precast lining prestressed connection structure of claim 1, wherein: and epoxy resin glue is brushed on the longitudinal abutted seam surface of the lining ring.
7. A method for connecting prefabricated linings of an up-and-down partitioned open-cut tunnel by prestress comprises the following steps:
1) completing the prefabrication of the prefabricated lining upper block and the prefabricated lining lower block, and transporting to an open cut tunnel construction site;
2) splicing the prefabricated lining upper block and the prefabricated lining lower block to form a lining ring;
3) brushing epoxy resin glue on the longitudinal abutted seam surfaces of two adjacent ring lining rings, then penetrating the temporary prestressed steel strand into a longitudinal prestressed tensioning hole at the same point position of the two adjacent ring lining rings, and performing longitudinal temporary prestressed tensioning on the temporary prestressed steel strand through longitudinal notches on the two adjacent ring lining rings;
4) after a plurality of ring lining rings are longitudinally assembled, the temporary prestress connection between two adjacent ring lining rings in each phase in the segment is released, then the permanent prestress steel strands penetrate through longitudinal prestress tensioning holes at the same point position of all the lining rings in the segment, and the permanent prestress steel strands are longitudinally and permanently tensioned through longitudinal notches in the head and tail lining rings;
5) and after the longitudinal permanent prestress tensioning is finished, grouting and plugging all longitudinal prestress tensioning holes in the segments, and sealing the longitudinal notches by adopting fine aggregate concrete.
8. The method for connecting the open trench tunnel prefabricated lining prestress of the up-and-down block division as recited in claim 7, wherein: in the step 3), after epoxy resin glue is coated, temporary prestress steel strands are respectively penetrated into longitudinal prestress tensioning holes at the same point positions on the top plate, the upper side wall, the lower side wall and the bottom plate of the two adjacent ring lining rings, and the temporary prestress steel strands are longitudinally and temporarily tensioned through the first longitudinal notch on the top plate and the second longitudinal notches on the upper side wall, the lower side wall and the bottom plate of the two adjacent ring lining rings.
9. The method for connecting the prefabricated lining of the open trench tunnel with the vertically partitioned structure as claimed in claim 7, wherein the concrete method for assembling the prefabricated lining upper partition and the prefabricated lining lower partition to form the lining ring in the step 2) comprises the following steps: splicing the prefabricated lining upper block and the prefabricated lining lower block vertically, then penetrating prestressed threaded steel bars into vertically corresponding vertical prestressed tensioning holes of the prefabricated lining upper block and the prefabricated lining lower block, and performing vertical permanent prestressed tensioning on the prestressed threaded steel bars through vertical notches in the prefabricated lining upper block and the prefabricated lining lower block; and after tensioning is finished, grouting and plugging are carried out on all vertical prestress tensioning holes, and the vertical notches are sealed by adopting fine aggregate concrete.
10. The pre-stressed connecting method for the open trench tunnel lining of claim 9, wherein the pre-stressed reinforcing steel bars are inserted into the corresponding vertical pre-stressed tension holes of the top plate, the top wall, the bottom plate and the bottom wall of the upper block, the top partition plate and the bottom partition plate, the top partition plate, the pre-stressed reinforcing steel bars are inserted into the corresponding vertical pre-stressed tension holes of the top plate, the top partition plate, the bottom partition plate and the top partition plate, and the corresponding vertical pre-stressed tension holes of the top plate, the bottom partition plate and the bottom partition plate are vertically aligned, and the corresponding pre-stressed reinforcing steel bars are vertically and permanently tensioned through the first vertical notch of the top plate, the second vertical notch of the bottom wall, and the third vertical notch of the bottom partition plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010921709.0A CN112112194A (en) | 2020-09-04 | 2020-09-04 | Upper and lower blocked open cut tunnel prefabricated lining prestress connecting structure and method |
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| CN202010921709.0A CN112112194A (en) | 2020-09-04 | 2020-09-04 | Upper and lower blocked open cut tunnel prefabricated lining prestress connecting structure and method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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