CN111794275A - Prefabricated assembled comprehensive pipe gallery structure and construction method thereof - Google Patents
Prefabricated assembled comprehensive pipe gallery structure and construction method thereof Download PDFInfo
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- CN111794275A CN111794275A CN202010602412.8A CN202010602412A CN111794275A CN 111794275 A CN111794275 A CN 111794275A CN 202010602412 A CN202010602412 A CN 202010602412A CN 111794275 A CN111794275 A CN 111794275A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
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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
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0001—Rubbers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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Abstract
The invention discloses a prefabricated assembled comprehensive pipe gallery structure and a construction method thereof, wherein the prefabricated assembled comprehensive pipe gallery structure comprises a plurality of pipe joints, each pipe joint comprises a first block and a second block, and the height of the side wall of each first block is greater than that of the side wall of each second block; the side wall of the first block and the side wall of the second block are connected with each other through a contact surface to form a pipe joint; the first block and the second block corresponding to every two adjacent pipe sections are arranged in an inverted mode. During construction, a first press polish process along with beating and smearing is adopted during the laying of a site cushion layer, secondary fine leveling is carried out through a small polishing machine after hardening, thin steel plates are laid on the cushion layer corresponding to the positions of the two side walls of the comprehensive pipe gallery, butter is coated, and the assembling process is lubricated; sequentially assembling the rest pipe joints and applying temporary prestress; grouting after applying permanent prestress. The invention solves the problem that large-volume components cannot be hoisted and transported, and the assembly and waterproof difficulty can be reduced by fewer blocks and staggered arrangement, thereby being beneficial to the waterproof of the structure and ensuring the bearing capacity and durability of the structure.
Description
Technical Field
The invention relates to the technical field of construction of comprehensive pipe galleries, in particular to a prefabricated assembled comprehensive pipe gallery structure and a construction method thereof.
Background
The utility tunnel is an underground city pipeline utility tunnel, a tunnel space is built under the city, various engineering pipelines such as electric power, communication, gas, heat supply, water supply and drainage and the like are integrated, and the utility tunnel is an important infrastructure and a 'lifeline' for guaranteeing the operation of the city.
The urban underground comprehensive pipe gallery is built in an assembly mode, the construction period can be shortened, the quality of the pipe gallery is improved, the comprehensive cost is reduced, the trend of industrial construction is met, and the method is one of the main modes for building the future comprehensive pipe gallery.
However, the size of the member is limited by urban transportation conditions, and the whole ring prefabrication cannot be achieved, meanwhile, practice shows that the waterproof effect of the prefabricated assembly member is closely related to block design, node design and control of the construction process, the existing prefabricated assembly construction method mostly focuses on whole ring prefabrication and connection, the research on the structure prefabrication and assembly method of upper and lower blocks is less, and the key control elements in the assembly construction process are not clear.
Therefore, how to divide the prefabricated structure into blocks in the prefabricated assembly to obtain better waterproof effect and construction efficiency becomes a technical problem which needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of the defects in the prior art, the invention provides a prefabricated and assembled comprehensive pipe gallery structure and a construction method thereof, and the purpose of ensuring the assembling construction efficiency and quality and the integral waterproof performance of the assembled pipe gallery is realized through reasonable block design, node design and construction process control.
In order to achieve the purpose, the invention discloses a prefabricated assembled comprehensive pipe gallery structure which comprises a plurality of pipe sections which are arranged along the length direction and are connected end to end, wherein each pipe section comprises a first block and a second block.
Each first block and the corresponding second block comprise side walls corresponding to wall plates on two sides of the corresponding pipe joint, and the height of each side wall of each first block is larger than that of each side wall of each second block;
the side wall of each first block and the side wall of the corresponding second block are opposite, and contact surfaces positioned at the end parts of the corresponding side walls are connected with each other to form the pipe joint;
the first block and the second block corresponding to each two adjacent pipe joints are arranged upside down, that is, the part of the two ends of each pipe joint corresponding to the first block is respectively connected with the part of the other pipe joint end corresponding to the second block.
Preferably, each contact surface of each first block connected with the corresponding second block is provided with a plurality of shear key convex surfaces and embedded bolt sleeves which are alternately arranged along the length direction;
the contact surface of each second block connected with the corresponding first block is provided with a plurality of shear key convex surfaces matched with the plurality of shear key convex surfaces on the contact surface of the corresponding first block and the plurality of embedded bolt sleeves, and a plurality of reserved inclined bolt hand holes;
each first sub-block contact surface with corresponding second sub-block the contact surface all is equipped with assorted reservation rubber waterstop recess, and through reserve rubber waterstop recess sets up rubber stagnant water and forms waterproof construction.
Preferably, every two adjacent pipe joints are connected through a plurality of composite positioning shear pins which are also used as prestressed tensioning holes.
Preferably, two ends of each reserved rubber water stop groove are respectively communicated with the corresponding first sub-block or the corresponding end face reserved water stop groove of the second sub-block corresponding to the end faces of the two ends of the pipe joint to form an integral reserved water stop groove;
the integral water stop groove is reserved and provided with an integral ethylene propylene diene monomer water stop to realize water resistance.
The invention also provides a construction method of the prefabricated assembled comprehensive pipe gallery structure, which comprises the following steps:
step 1, manufacturing all the pipe joints according to design, and transporting to a construction site;
step 2, constructing a cushion layer at the bottom of a foundation pit of the comprehensive pipe gallery; when the cushion layer is laid, a calendaring process along with polishing and smearing is adopted, and after hardening, a small polishing machine is adopted for secondary fine leveling;
3, laying thin steel plates on the cushion layer corresponding to the positions of the two side walls of the comprehensive pipe gallery, coating butter, and lubricating the assembling process;
step 4, hanging the first block or the second block of the first pipe joint at the lower part to a specified position, then hanging the corresponding second block or the first block at the upper part to the specified position, and fixing the second block or the first block through a plurality of reserved inclined bolt hand holes and a plurality of matched embedded bolt sleeves;
step 5, inserting a composite positioning shear pin into the end surface of the spliced first section of the pipe joint, hoisting the first block and the second block corresponding to the second section of the pipe joint to the side of the first section of the pipe joint, aligning a plurality of prestressed tensioning holes and corresponding composite positioning shear pins, and splicing; then fixing the first block and the second block of the second section of the pipe joint according to the step 4;
step 6, mounting temporary bracket anchor seats on the top plate, the wall plate and the bottom plate of the first section and the second section of the pipe sections, adopting prestressed finish-rolled deformed steel bars as temporary external prestressed bars, and connecting the prestressed bars between the two pipe sections by adopting connectors to enable the prestressed bars to be on the same axis;
step 7, sequentially grading the splicing seams by adopting a through jack tensioning technology, wherein the top tension of each grade is different, and synchronously tensioning; during tensioning, the control of the abutted seam gap is taken as a main part, and the control of the tensioning force is taken as an auxiliary part; recording the displacement change of the abutted seam gap and the tension force safety preset recording table, and stopping tension when the abutted seam gap is in place;
step 8, repeating the step 5 to the step 7, sequentially assembling all the residual pipe joints, and tensioning the temporary prestress;
step 9, after the temporary prestress is tensioned and fixed, permanent prestress tensioning can be carried out;
and step 10, grouting to form a whole after the permanent prestress tensioning is finished.
Preferably, in the step 7, the splicing seams are sequentially graded by adopting a through jack tensioning technology, two steel bars of the bottom plate are tensioned to be close to each other in the process that the splicing joints are close to the fixed joints before tensioning, and meanwhile, the hoisting equipment is used for hoisting but not separating from the cushion layer so as to reduce friction force.
Preferably, in the step 7, the jacking forces of each stage are different, and the synchronous tensioning refers to: during tensioning, the control of the abutted seam gap is taken as a main part, and the control of the tensioning force is taken as an auxiliary part; recording the displacement change of the abutted seam gap and the tension force safety preset recording table, and stopping tension when the abutted seam gap is in place; and after tensioning is finished, locking the prestress by using a nut, and removing the jack and the supporting leg.
Preferably, in step 9, the steel strand adopted by the permanent prestress tensioning is subjected to tension force and elongation double control, and the tension force is controlled not to exceed a design allowable value;
the permanent prestress tensioning sequence is that a bottom plate is firstly tensioned and then a top plate is tensioned in a grading way, each grade is 2t, and the measurement and the record of the force and the elongation are carried out according to a plan;
and after the permanent prestressed steel bundle is tensioned, measuring and recording gaps of all the abutted seams, and if the abutted seams are subjected to bias tension, adjusting the tensioning force in time or stopping the tensioning.
Preferably, the permanent prestress tensioning is used for relieving temporary prestress in a symmetrical successive tensioning and unloading mode;
and after unloading, performing seam width measurement recording on the marked splicing seam measuring points, and comparing whether seam width change before and after unloading meets design requirements.
The invention has the beneficial effects that:
the invention solves the problem that large-volume components cannot be hoisted and transported, and the fewer block modes and staggered joint arrangement can reduce the assembly and waterproof difficulty, facilitate the waterproof of the structure and ensure the bearing capacity and durability of the structure.
The invention has universality, and the prefabrication problem of the whole section of the standard section of the pipe gallery can be solved through 2 sets of templates.
The invention adopts the inclined bolt and the shear force key connection between the upper and the lower blocks, simultaneously meets the requirements of positioning and shearing resistance, and the joint can bear certain bending moment and is convenient to install.
The longitudinal connection of the invention adopts the composite positioning shear pin which has shear resistance, positioning and prestressed grouting holes, and the invention has simple operation and strong reliability.
The construction method has the advantages that the cushion layer construction, the temporary prestress application and the permanent prestress application in the splicing process are elaborated in detail, the joints are reliable according to field test results, the waterproof performance is good, the operability is strong, the design and construction of the prefabricated spliced comprehensive pipe gallery can be effectively guided, and the key technology can be applied to other open-cut underground structures such as open-cut tunnel prefabricated splicing.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 shows a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic end-face structure diagram of the first segment in the embodiment of the present invention.
Fig. 3 shows a schematic view of a portion of the structure of fig. 2 according to the present invention.
Fig. 4 is a schematic structural diagram illustrating a splicing state of the first segment and the second segment in the embodiment of the present invention.
Fig. 5 shows a schematic view of the structure of the invention in partial section at B in fig. 4.
Fig. 6 is a schematic view showing a state in which the temporary prestress is tensioned according to an embodiment of the present invention.
Fig. 7 shows a schematic view of a partial structure of the invention at C in fig. 6.
FIG. 8 is a schematic view showing a state in which tension permanent prestressing is completed according to an embodiment of the present invention.
Detailed Description
Examples
As shown in figures 1 to 5, the prefabricated assembled comprehensive pipe gallery structure comprises a plurality of pipe joints which are arranged along the length direction and connected end to end, wherein each pipe joint comprises a first block and a second block.
Each first block and each corresponding second block respectively comprise side walls corresponding to the wall plates on two sides of the corresponding pipe joint, and the height of each side wall of each first block is greater than that of each side wall of each second block;
the side wall of each first block and the side wall of the corresponding second block are mutually connected through contact surfaces which are opposite and positioned at the end parts of the corresponding side walls to form a pipe joint;
the first block and the second block corresponding to every two adjacent pipe joints are arranged in an inverted mode, namely, the part, corresponding to the first block, of the two ends of each pipe joint is connected with the part, corresponding to the second block, of the end part of the other adjacent pipe joint.
As shown in fig. 2 to 5, in some embodiments, each contact surface of each first segment connected to the corresponding second segment is provided with a plurality of shear key convex surfaces and embedded bolt sleeves alternately arranged along the length direction;
the contact surface of each second block connected with the corresponding first block is provided with a plurality of shear key convex surfaces matched with a plurality of embedded bolt sleeves and a plurality of shear key concave surfaces matched with a plurality of embedded bolt sleeves on the contact surface of the corresponding first block and a plurality of reserved inclined bolt hand holes;
the contact surface of each first sub-block and the contact surface of the corresponding second sub-block are provided with a reserved rubber water stop groove matched with each other, and a waterproof structure is formed by arranging rubber water stop in the reserved rubber water stop groove.
The principle of the invention is as follows:
the waterproof difficulty can be increased by considering that a cross seam is formed at the connecting point of the circular seam and the longitudinal seam after the upper and lower blocks are divided, and meanwhile, in order to reduce the excessive types of the cross sections of the blocks, which are not beneficial to commercial standardized manufacture, the first block and the second block are designed into two blocks with different side wall heights, and the two blocks are arranged in a staggered manner in a vertically reversed manner when pipe joints are connected.
In some embodiments, as shown in fig. 4 and 5, every two adjacent pipe sections are connected by a plurality of composite positioning shear pins which are also used as prestressed tensioning holes.
In some embodiments, two ends of each reserved rubber water stop groove are respectively communicated with the corresponding first sub-block or the corresponding end face reserved water stop groove of the corresponding pipe joint of the second sub-block to form an integral reserved water stop groove;
the integral water stop groove is reserved for arranging the integral ethylene propylene diene monomer water stop to realize water resistance.
In practical application, the integral ethylene propylene diene monomer water stop belt surrounds the annular end face and the longitudinal end face of the component. The first sub-block and the second sub-block are assembled up and down and then compress the water stop belt by means of self weight, and the longitudinally adjacent pipe joints are assembled and then compress the water stop belt by means of prestress, so that the waterproof requirement is met.
As shown in fig. 6 to 8, the construction method of the prefabricated assembled comprehensive pipe gallery structure comprises the following steps:
step 1, manufacturing all pipe joints according to design, and transporting to a construction site;
step 2, constructing a cushion layer at the bottom of a foundation pit of the comprehensive pipe gallery; when the cushion layer is laid, a press polish process along with beating and smearing is adopted, and after hardening, a small-sized polishing machine is adopted for secondary fine leveling;
3, laying thin steel plates on the cushion layer corresponding to the positions of the two side walls of the comprehensive pipe gallery, coating butter, and lubricating the assembling process;
step 4, hanging the first block or the second block of the first pipe joint at the lower part to a specified position, then hanging the corresponding second block or the first block at the upper part to the specified position, and fixing the second block or the first block through a plurality of reserved inclined bolt hand holes and a plurality of matched embedded bolt sleeves;
step 5, inserting a composite positioning shear pin into the end face of the spliced first pipe joint, hoisting a first block and a second block corresponding to a second pipe joint to the side of the first pipe joint, aligning a plurality of prestressed tensioning holes with the corresponding composite positioning shear pins, and splicing; then fixing the first block and the second block of the second pipe joint according to the step 4;
step 6, mounting temporary bracket anchor seats on the top plate, the wall plate and the bottom plate of the first section and the second section of pipe joint, adopting prestressed finish-rolled deformed steel bars as temporary external prestressed bars, and connecting the prestressed bars between the two pipe joints by adopting a connector to ensure that the prestressed bars are on the same axis;
step 7, sequentially grading the splicing seams by adopting a through jack tensioning technology, wherein the top tension of each grade is different, and synchronously tensioning; during tensioning, the control of the abutted seam gap is taken as a main part, and the control of the tensioning force is taken as an auxiliary part; recording the displacement change of the abutted seam gap and a preset tension force recording table, and stopping tension when the abutted seam gap is in place;
step 8, repeating the step 5 to the step 7, sequentially assembling all the rest pipe joints, and tensioning the temporary prestress;
step 9, after the temporary prestress is tensioned and fixed, permanent prestress tensioning can be carried out;
and step 10, grouting to form a whole after the permanent prestress tensioning is finished.
In some embodiments, in step 7, the splicing seams are sequentially graded by using a through jack tensioning technology, two steel bars of the bottom plate are tensioned to be close to each other in the process that the splicing joints are close to the fixed joints before tensioning, and meanwhile, the hoisting equipment is used for hoisting but not separating from the cushion layer so as to reduce friction force.
In some embodiments, in step 7, the top tension of each stage is different, and the synchronous tensioning refers to: during tensioning, the control of the abutted seam gap is taken as a main part, and the control of the tensioning force is taken as an auxiliary part; recording the displacement change of the abutted seam gap and a preset tension force recording table, and stopping tension when the abutted seam gap is in place; and after tensioning is finished, locking the prestress by using a nut, and removing the jack and the supporting leg.
In some embodiments, in step 9, the steel strand used for the permanent prestress tensioning is subjected to tension force and elongation double control, and the tension force is controlled not to exceed a design allowable value;
the permanent prestress tensioning sequence is that a bottom plate is firstly tensioned and then a top plate is tensioned in a grading way, 2t is carried out on each grade, and the measurement and the record of the force and the elongation are carried out according to the plan;
and after the tension of the permanent prestressed steel bundles is finished, measuring and recording gaps of all the abutted seams, and if the abutted seams are subjected to bias tension, adjusting the tension force in time or stopping the tension.
In some embodiments, the permanent prestress tension relieves the temporary prestress in a symmetrical gradual tension unloading mode;
and after unloading, performing seam width measurement recording on the marked splicing seam measuring points, and comparing whether seam width change before and after unloading meets design requirements.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. The prefabricated assembled comprehensive pipe gallery structure comprises a plurality of pipe joints which are arranged along the length direction and connected end to end, wherein each pipe joint comprises a first block and a second block; the method is characterized in that:
each first segment and the corresponding second segment comprise side walls corresponding to wall plates on two sides of the corresponding pipe joint, and the height of the side wall of the first segment is larger than that of the side wall of the second segment;
the side wall of each first block and the side wall of the corresponding second block are opposite, and contact surfaces positioned at the end parts of the corresponding side walls are connected with each other to form the pipe joint;
the first block and the second block corresponding to each two adjacent pipe joints are arranged upside down, that is, the part of the two ends of each pipe joint corresponding to the first block is respectively connected with the part of the other pipe joint end corresponding to the second block.
2. The prefabricated assembled comprehensive pipe gallery structure according to claim 1, wherein each contact surface of each first sub-block connected with the corresponding second sub-block is provided with a plurality of shear key convex surfaces and embedded bolt sleeves which are alternately arranged in the length direction;
the contact surface of each second block connected with the corresponding first block is provided with a plurality of shear key convex surfaces matched with the plurality of shear key convex surfaces on the contact surface of the corresponding first block and the plurality of embedded bolt sleeves, and a plurality of reserved inclined bolt hand holes;
each first sub-block contact surface with corresponding second sub-block the contact surface all is equipped with assorted reservation rubber waterstop recess, and through reserve rubber waterstop recess sets up rubber stagnant water and forms waterproof construction.
3. The prefabricated assembled comprehensive pipe gallery structure according to claim 1, wherein every two adjacent pipe sections are connected through a plurality of composite positioning shear pins which are also used as prestressed tensioning holes.
4. The prefabricated assembled comprehensive pipe gallery structure according to claim 1, wherein two ends of each reserved rubber water stop groove are respectively communicated with the corresponding first sub-block or the corresponding end face reserved water stop groove of the second sub-block corresponding to the end faces of the two ends of the pipe joint to form an integral reserved water stop groove;
the integral water stop groove is reserved and provided with an integral ethylene propylene diene monomer water stop to realize water resistance.
5. The construction method of the prefabricated assembled comprehensive pipe gallery structure comprises the following steps:
step 1, manufacturing all the pipe joints according to design, and transporting to a construction site;
step 2, constructing a cushion layer at the bottom of a foundation pit of the comprehensive pipe gallery; when the cushion layer is laid, a calendaring process along with polishing and smearing is adopted, and after hardening, a small polishing machine is adopted for secondary fine leveling;
3, laying thin steel plates on the cushion layer corresponding to the positions of the two side walls of the comprehensive pipe gallery, coating butter, and lubricating the assembling process;
step 4, hanging the first block or the second block of the first pipe joint at the lower part to a specified position, then hanging the corresponding second block or the first block at the upper part to the specified position, and fixing the second block or the first block through a plurality of reserved inclined bolt hand holes and a plurality of matched embedded bolt sleeves;
step 5, inserting a composite positioning shear pin into the end surface of the spliced first section of the pipe joint, hoisting the first block and the second block corresponding to the second section of the pipe joint to the side of the first section of the pipe joint, aligning a plurality of prestressed tensioning holes and corresponding composite positioning shear pins, and splicing; then fixing the first block and the second block of the second section of the pipe joint according to the step 4;
step 6, mounting temporary bracket anchor seats on the top plate, the wall plate and the bottom plate of the first section and the second section of the pipe sections, adopting prestressed finish-rolled deformed steel bars as temporary external prestressed bars, and connecting the prestressed bars between the two pipe sections by adopting connectors to enable the prestressed bars to be on the same axis;
step 7, sequentially grading the splicing seams by adopting a through jack tensioning technology, wherein the top tension of each grade is different, and synchronously tensioning; during tensioning, the control of the abutted seam gap is taken as a main part, and the control of the tensioning force is taken as an auxiliary part; recording the displacement change of the abutted seam gap and the tension force safety preset recording table, and stopping tension when the abutted seam gap is in place;
step 8, repeating the step 5 to the step 7, sequentially assembling all the residual pipe joints, and tensioning the temporary prestress;
step 9, after the temporary prestress is tensioned and fixed, permanent prestress tensioning can be carried out;
and step 10, grouting to form a whole after the permanent prestress tensioning is finished.
6. The construction method of the prefabricated assembled comprehensive pipe gallery structure according to claim 5, wherein in the step 7, the splicing seams are sequentially graded by adopting a through jack tensioning technology, two steel bars of the bottom plate are tensioned to be close to each other in the process of approaching the assembled joints to the fixed joints before tensioning, and meanwhile, a lifting device is used for lifting without separating from a cushion layer so as to reduce friction force.
7. The construction method of the prefabricated assembled comprehensive pipe gallery structure according to claim 5, wherein in the step 7, the jacking force of each stage is different, and the synchronous tensioning refers to the following steps: during tensioning, the control of the abutted seam gap is taken as a main part, and the control of the tensioning force is taken as an auxiliary part; recording the displacement change of the abutted seam gap and the tension force safety preset recording table, and stopping tension when the abutted seam gap is in place; and after tensioning is finished, locking the prestress by using a nut, and removing the jack and the supporting leg.
8. The construction method of the prefabricated assembled comprehensive pipe gallery structure according to claim 5, wherein in the step 9, the steel bundle adopted by the permanent prestress tensioning is subjected to tension force and elongation double control, and the tension force is controlled not to exceed a design allowable value;
the permanent prestress tensioning sequence is that a bottom plate is firstly tensioned and then a top plate is tensioned in a grading way, each grade is 2t, and the measurement and the record of the force and the elongation are carried out according to a plan;
and after the permanent prestressed steel bundle is tensioned, measuring and recording gaps of all the abutted seams, and if the abutted seams are subjected to bias tension, adjusting the tensioning force in time or stopping the tensioning.
9. The construction method of the prefabricated assembled comprehensive pipe gallery structure according to claim 5, wherein the permanent prestress tensioning is used for relieving temporary prestress in a symmetrical successive tensioning and unloading mode;
and after unloading, performing seam width measurement recording on the marked splicing seam measuring points, and comparing whether seam width change before and after unloading meets design requirements.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359880A (en) * | 2020-11-26 | 2021-02-12 | 中铁第四勘察设计院集团有限公司 | Assembled underground structure seam connection structure |
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Application publication date: 20201020 |