CN113279428B - Semi-suspended prestressed concrete wall roadway under cover-excavation top-down condition and construction method - Google Patents
Semi-suspended prestressed concrete wall roadway under cover-excavation top-down condition and construction method Download PDFInfo
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- CN113279428B CN113279428B CN202110643726.7A CN202110643726A CN113279428B CN 113279428 B CN113279428 B CN 113279428B CN 202110643726 A CN202110643726 A CN 202110643726A CN 113279428 B CN113279428 B CN 113279428B
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- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 16
- 238000010276 construction Methods 0.000 title abstract description 24
- 238000009412 basement excavation Methods 0.000 title abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 239000004567 concrete Substances 0.000 claims abstract description 19
- 210000002435 tendon Anatomy 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 230000000452 restraining effect Effects 0.000 claims 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 claims 1
- 239000000725 suspension Substances 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000012876 topography Methods 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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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
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a construction method of a semi-suspended prestressed concrete wall roadway under a cover-excavation reverse-acting condition, which comprises a section steel concrete beam, a roadway plate, side walls, a top plate, a prestressed side wall and an anchorage device, wherein the prestressed side wall comprises a suspended prestressed suspender, and the prestressed suspender is divided into a prestressed steel beam tensioning end and a prestressed steel beam fixing end and is respectively connected with the top plate and the roadway plate. The invention has the beneficial effects that: practice thrift the city and use the ground, alleviate traffic hub pressure, make full use of underground space provides a prestressed concrete wall semi-suspension type underground traffic lane, and this underground traffic lane not only can adapt to different geology and topography condition, and the construction is swift, saves road construction cost.
Description
Technical Field
The invention relates to the technical field of prestressed concrete wall semi-suspension type roadways, in particular to a semi-suspension prestressed concrete wall roadway under the condition of cover-excavation top-down operation and a construction method.
Background
The conventional urban highway lane generally comprises structures such as a road surface, a roadbed, a foundation and the like according to different structural systems, and the load of an upper structure directly acts on the road surface and is transmitted to the foundation and the foundation, or an overhead structure is adopted to transmit the load to the lower part through lower structures such as piers, bridge abutments and the like. It can be seen that no matter what kind of system of road structure, no matter the road surface roadbed or the elevated structure on the ground will occupy a large amount of land, further increasing the urban traffic pressure. However, with the development of economy, the existing roads in a large number of cities cannot meet the requirement of the existing traffic volume, especially for some large-scale cities, the urban road construction becomes very complicated and difficult due to the limitation of land and terrain, and even though many road construction schemes are feasible, the original construction plan is often abandoned due to too high cost. In addition, under some special conditions such as terrain or multi-line overlapping, the road needs to be built underground, and if the conventional road building mode is adopted, time can be delayed, and even the original structural requirement cannot be met.
If an underground driveway which is suitable for different geological and topographic conditions and can be constructed quickly is provided, the technical problem to be solved is solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, mainly aims to save the urban land, relieve the pressure of a traffic junction and fully utilize the underground space, and provides the prestressed concrete wall semi-suspended underground traffic lane which not only can adapt to different geological and topographic conditions, but also is quick in construction and saves the road construction cost.
The purpose of the invention is realized by the following technical scheme: the semi-suspended prestressed concrete wall roadway comprises a top plate, roadway plates, side walls, prestressed side walls, a profile steel concrete beam, prestressed suspension rods, anchors and corrugated pipes, wherein the left end of the roadway plate is directly poured and connected with the side walls, and the lower part of the prestressed side wall at the right end of the roadway is connected with the top plate at the upper part through the prestressed suspension rods.
The concrete of the traffic lane: any chloride-doped admixture cannot be used practically. The concrete for the prestressed tendon end sealing is C40 micro-expansion fine-stone concrete.
The prestressed suspender is: the low-relaxation prestressed steel strand with the diameter of 15.2mm and the ultimate strength standard value of 1860MPa is adopted. The performance of the steel wire should meet the stipulation of the steel wire for prestressed concrete (GB/T5224-2014), the steel wire should not have dead bends, and the dead bends must be cut off.
The prestress suspender tension control stress is temporarily 1395MPa, the tension control force of each prestress rib is 195kN, and the prestress rib can be tensioned after the concrete reaches 100% of the design strength. During tensioning, a stress control and strain check method is adopted, and the deviation of an actually measured elongation value and a calculated value is within a range of-6% to + 6%.
The section steel in the section steel concrete beam is preferably I-shaped rolled section steel or I-shaped welded section steel. The steel is carbon structural steel of grade Q235-B, C, D, low-alloy high-strength structural steel of grade Q345-B, C, D, E or grade Q390-B, C, D, E. The concrete strength grade in the steel reinforced concrete is preferably more than or equal to C30 grade. When the thickness of the steel plate for welding the section steel is more than or equal to 40mm and the width of the section bearing the section steel concrete beam is not more than 300 mm; the ratio of the height to the width of the cross-section is preferably not greater than 4.
The anchorage device is characterized in that: the anchorage at the tension end and the fixed end respectively adopts a QM15 series clamping piece type anchorage and an extrusion anchorage, the static load anchorage performance of the anchorage needs to be checked, the requirements of anchorage, a clamp and a connector for prestressed tendons GB/T14370-2015 are met, the clamping piece hardness needs to be randomly checked according to the requirements, and a hardness report sent by a manufacturer or a monitoring mechanism is provided.
The corrugated pipe is as follows: the material for the bonding prestressed duct is a galvanized corrugated pipe, and the wall thickness should not be less than 0.3 mm.
The prestressed corrugated pipe and the steel stranded wire are firstly penetrated at the beam column joint, a prestressed fixed-end anchorage device is arranged, and then a column hoop rib is bound
The cement slurry comprises the following components: the cementing prestressed duct grouting adopts 32.5 grade or above ordinary portland cement, the water cement ratio is controlled between 0.40 and 0.45, and a proper amount of expanding agent is added to participate in the compactness of duct grouting, and the 28-day strength of cement slurry is not lower than 30 MPa.
The invention has the following advantages:
1. the invention connects the upper-lower structure through the prestressed suspender and configures enough bearing capacity, thereby overcoming the defect that the traditional traffic lane depends on a foundation or foundation bearing mode, and avoiding the influence of bad geological conditions, complex terrain conditions and bad meteorological conditions on the construction and operation of the traffic lane.
2. The semi-suspension roadway plate, the pre-stressed anchor cable, the anchorage device, the corrugated pipe and the like can be prefabricated in factories and assembled on site, can meet the construction requirements of modularization and rapidness, can be used as a stock member under certain conditions, can meet the construction requirements of roadway structures with different widths and spans, and solves the problems of poor universality and long construction period of the traditional roadway construction member.
3. The invention can limit and restrict the change of the surface of the traffic lane by the prestressed suspension rod, and simultaneously has the function of limiting, thereby ensuring the stability and the safety of the traffic lane.
4. The construction process of the construction of the traffic lane is simplified, and because the construction of the traffic lane is a semi-suspension structure and foundation construction is not needed, detailed geological and topographic exploration work on the accessories of the traffic lane is not needed, the traffic lane can pass only after the prestressed suspender is in place, and the traffic lane can pass through and walk.
5. The invention solves the problem that the underground structure cannot use a plate column support system due to the limitation, is suitable for the construction of lanes with various spans, is particularly suitable for the rapid construction of the lanes under the conditions of the underground structure and the like, and solves the problem of difficult construction of the lanes of a complex underground comprehensive junction.
Drawings
FIG. 1 is a side schematic view of the inventive roadway structure;
FIG. 2 is a front schematic view of the roadway configuration of the present invention;
FIG. 3 is a schematic view of the tensioned end of the prestressed boom of the present invention;
FIG. 4 is a schematic view of the fixed end of the prestressed boom of the present invention.
In the figure, a steel reinforced concrete beam 1, a lane plate 2, a side wall 3, a top plate 4, a prestressed side wall 5, a prestressed suspension rod 6, a prestressed steel beam tensioning end 7, a prestressed steel beam fixing end 8, a corrugated pipe 9, a roadway floor steel bar 10, an exhaust pipe 11, a restraint ring 12, a pressing plate 13, a spiral steel bar 14, a beard steel bar 15, an anchor backing plate 16, a clamping piece 17 and a prestressed steel bar 18 are adopted.
Detailed Description
The invention will be further described with reference to the accompanying drawings, without limiting the scope of the invention to the following:
as shown in fig. 1 to 4, the semi-suspended prestressed concrete wall roadway under the cover-and-dig reverse-acting condition and the construction method thereof comprise a mounted and poured steel reinforced concrete beam 1, a poured roadway plate 2, a side wall 3, a top plate 4 and a prestressed side wall 5, wherein the prestressed side wall 5 comprises a prestressed suspender 6, and the prestressed suspender is divided into a prestressed steel beam tensioning end 7 and a prestressed steel beam fixing end 8 which are respectively connected with the top plate 4 and the roadway plate 2.
The prestressed side wall 5 is provided with a prestressed suspension rod 6 which is connected with the lane bottom plate 2 and the lane top plate 4. The prestressed suspenders 6 are solid round steel rods with the size of phi 150mm and are arranged at intervals of 2.167m in the lane direction.
The lane board 2 does not need any chloride-doped additive, and the concrete for the prestressed tendon end sealing is C40 micro-expansion fine-stone concrete.
The prestress suspender 6 is tensioned to control the stress to be temporarily 1395MPa, the tensioning control force of each prestress rib 18 is 195kN, when the concrete reaches 100% of the design strength, tensioning can be carried out, the tensioning is carried out by adopting a method of stress control and strain check, and the deviation of the actually measured elongation value and the calculated value is within the range of-6%.
The prestressed suspender 6 adopts a low relaxation prestressed steel strand with the diameter of 15.2mm and the limit strength standard value of 1860MPa, and the length of the prestressed tendon 18 is the stretching operation length of not less than 1000mm of each stretching end on the basis of the straight line length of a plane graph.
The prestressed steel strand tensioning end 7, the prestressed steel strand fixing end 8 and the anchorage device respectively adopt a QM15 series clamping piece type anchorage device and an extrusion anchor, and the static load anchorage performance of the anchorage device must be tested.
The prestressed steel beam fixing end 8 is composed of a corrugated pipe 9, an exhaust pipe 11, a restraint ring 12, a pressing plate 13, a spiral rib 14 and an anchor backing plate 16, the corrugated pipe 9 and the spiral rib 14 are installed to a reserved position before the prestressed side wall 5 is not poured, and the prestressed steel beam 18 in the prestressed steel beam tensioning end 7 is tensioned after the fixing end is extruded by the restraint ring 12 and the pressing plate 13.
The prestressed steel beam tensioning end 7 is composed of a corrugated pipe 9, a spiral rib 14, a beard rib 15, an anchor backing plate 16 and a clamping piece 17, the corrugated pipe 9, the spiral rib 14, the beard rib 15 and the anchor backing plate 16 are installed to a reserved position before the top plate 4 is not poured, after the installation is finished, after concrete of the prestressed side wall 5 is poured to reach a certain strength, a prestressed rib 18 is inserted into the reserved corrugated pipe 9, the clamping piece 17 is installed to a fixed position, and a jack is applied to finish prestressed tensioning.
The tensioning procedure of the prestressed tendon 18 is as follows:
0 → initial stress → 2 times initial stress → 1.05ocom (hold the load for 2min to 5min anchor) → ocom (anchor)
After the prestressed suspender 6 is tensioned, the end sealing work is done according to the production grid, and the method comprises the following specific steps:
(1) and cutting off the redundant steel strands by adopting a grinding wheel, keeping the length of the residual exposed steel strands not less than 30mm, and strictly cutting off by adopting electric arcs.
(2) Cleaning the tensioning end and the periphery thereof, and grouting the bonded prestressed duct.
(3) And C40 micro-expansion fine stone concrete is used for blocking the tensioning end.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. Cover and dig half under the contrary condition of doing that hangs prestressed concrete wall lane, including shaped steel concrete beam, lane board, side wall, roof, prestressed side wall and ground tackle, its characterized in that: the prestressed side wall comprises a prestressed suspender, and the prestressed suspender is divided into a prestressed steel beam stretching end and a prestressed steel beam fixing end and is respectively connected with the top plate and the roadway plate;
the prestressed steel beam fixed end consists of a corrugated pipe, an exhaust pipe, a restraining ring, a pressing plate, a spiral rib and an anchor backing plate, the corrugated pipe and the spiral rib are installed to a reserved position before the prestressed side wall is not poured, and the prestressed steel beam tensioning end is tensioned after the fixed end is extruded by the restraining ring and the pressing plate;
the prestressed steel beam tensioning end comprises a corrugated pipe, a spiral rib, a beard rib, an anchor backing plate and a clamping piece, wherein the corrugated pipe, the spiral rib, the beard rib and the anchor backing plate are installed to a reserved position before a top plate is not poured, after the installation is finished, the prestressed reinforcement is inserted into the reserved corrugated pipe after the concrete pouring of the prestressed side wall reaches the strength, the clamping piece is installed to a fixed position, and a jack is applied to finish the prestressed tensioning.
2. The cover-dig topdown semi-suspended prestressed concrete wall roadway of claim 1, further comprising: the size of the prestress suspender is a solid round steel rod with the diameter of 150mm, and the prestress suspender is arranged at intervals of 2.167m along the direction of the lane.
3. The cover-dig topdown semi-suspended prestressed concrete wall roadway of claim 1, further comprising: the lane board does not need any admixture doped with chloride, and the concrete used for the prestressed tendon end sealing is C40 micro-expansion fine-stone concrete.
4. The cover-dig topdown semi-suspended prestressed concrete wall roadway of claim 1, further comprising: the tensioning control stress of the prestressed suspender is 1395MPa, the tensioning control force of each prestressed tendon is 195kN, when the concrete reaches 100% of the design strength, tensioning can be carried out, the tensioning is carried out by adopting a stress control and strain check method, and the deviation of the actually measured elongation value and the calculated value is in the range of-6%.
5. The cover-dig topdown semi-suspended prestressed concrete wall roadway of claim 1, further comprising: the prestressed suspender adopts a low-relaxation prestressed steel strand with the diameter of 15.2mm and the ultimate strength standard value of 1860MPa, and the length of the prestressed tendon is the stretching operation length of not less than 1000mm of each stretching end on the basis of the straight-line length of a plan view.
6. The cover-dig topdown semi-suspended prestressed concrete wall roadway of claim 1, further comprising: the anchorage device is a QM15 series clamping piece type anchorage device and an extrusion anchor respectively, and the static load anchorage performance of the anchorage device must be checked.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110643726.7A CN113279428B (en) | 2021-06-09 | 2021-06-09 | Semi-suspended prestressed concrete wall roadway under cover-excavation top-down condition and construction method |
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| CN202110643726.7A CN113279428B (en) | 2021-06-09 | 2021-06-09 | Semi-suspended prestressed concrete wall roadway under cover-excavation top-down condition and construction method |
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| CN113279428A CN113279428A (en) | 2021-08-20 |
| CN113279428B true CN113279428B (en) | 2022-08-12 |
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