CN108729346B - Circumferential prestress pipeline structure and manufacturing method thereof - Google Patents
Circumferential prestress pipeline structure and manufacturing method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000011178 precast concrete Substances 0.000 claims abstract description 95
- 239000004567 concrete Substances 0.000 claims abstract description 74
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 61
- 239000010959 steel Substances 0.000 claims abstract description 61
- 239000011241 protective layer Substances 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000007788 roughening Methods 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 5
- 238000009417 prefabrication Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 238000007789 sealing Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
- B28B21/60—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/70—Methods or machines specially adapted for the production of tubular articles by building-up from preformed elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a circumferential prestress pipeline structure and a manufacturing method thereof, wherein the circumferential prestress pipeline structure comprises more than two precast concrete arc-shaped duct pieces spliced with each other, wherein two adjacent precast concrete arc-shaped duct pieces are connected through expanded concrete, a reserved groove extending along the circumferential direction is formed in the outer side surface of each precast concrete arc-shaped duct piece, and tenons are respectively arranged at the two circumferential ends of each precast concrete arc-shaped duct piece; the annular prestress pipeline structure further comprises annular steel wires arranged in the reserved grooves and a pushing device used for adjusting the distance between two adjacent precast concrete arc-shaped duct pieces. The circumferential prestress pipeline structure provided by the invention can bear larger pressure, so that the traditional anchoring problem is changed, and curve prestress loss is fundamentally avoided. The manufacturing method provided by the invention can realize prefabrication and assembly, is simple in construction, safe and reliable, and expands the application field of the annular prestress pipeline structure.
Description
Technical Field
The invention relates to the technical field of pipelines, in particular to a circumferential prestress pipeline structure and a manufacturing method thereof.
Background
With the urban process of China, municipal projects are rapidly developed, and pipeline structures in municipal engineering are increasingly applied, such as water supply pipelines, open caissons, cofferdams and the like. When the pipeline structure is assembled, two adjacent duct pieces in the circumferential direction are connected through bolts, and gaps between the adjacent duct pieces are difficult to effectively close. Along with the influence of water flow erosion, uneven settlement of stratum, traffic load and the like, the phenomena of water seepage, damage and the like occur at the weak part of the segment gap. The existing method for applying the circumferential prestress is complex, an anchoring device is needed, and prestress loss of an anchoring area is easy to cause.
In the prior art, some technical researches on pipeline structures are carried out, but the technical researches are not satisfactory in the aspects of practicality, convenience and safety. For example, the application number is CN201510523909, the pipeline structure part is designed with a bottom arch block, adjacent fast sealing blocks and top sealing blocks, grooves are reserved in the bottom arch block, the top sealing blocks are reserved with pore channels, the bottom arch block, the adjacent fast sealing blocks and the top sealing blocks are connected in series through steel strands to form a cylindrical structure, the steel strands penetrate through the protruding top sealing blocks, and prestress application is realized through fixing a steel strand lockset protruding out of the top sealing blocks. The method is complex in prefabrication and complex in construction, and the difficulty of inserting the steel strands into a large-span pipeline structure is high, so that the prestress application effect is poor, the prestress tensioning precision is low, and the prestress is easy to lose.
For another example, the application number is CN201620461935, two inner and outer segment rings are designed, each segment ring is formed by connecting a plurality of segment plates end to end, the segments are uniformly distributed along the circular ring direction steel strand pore canal, at least one anchor groove of any segment plate is used for connecting each segment ring through the steel strand for tensioning, and the circumferential prestress is obtained. The circumferential prestress loss applied by the traditional anchoring mode is large, and how to improve the anchoring mode and avoid the prestress loss is one of the important research contents of municipal pipeline structures at present.
Disclosure of Invention
The invention provides a circumferential prestress pipeline structure and a manufacturing method thereof, aiming at solving the problem that the prestress loss is excessive when the existing prestress pipeline structure stretches steel strands (steel wires). The specific technical scheme is as follows.
The utility model provides a hoop prestressing force pipeline structure, its precast concrete arc section of jurisdiction that includes the mutual concatenation of more than two, its characterized in that: two adjacent precast concrete arc-shaped duct pieces are connected through expanded concrete, a reserved groove extending along the circumferential direction is formed in the outer side face of each precast concrete arc-shaped duct piece, tenons and tenons are respectively formed in the two circumferential ends of each precast concrete arc-shaped duct piece, and the two adjacent precast concrete arc-shaped duct pieces are spliced through the tenons and the tenons; the annular prestress pipeline structure further comprises annular steel wires arranged in the reserved grooves and a pushing device used for adjusting the distance between two adjacent precast concrete arc-shaped duct pieces.
Further, grooving or roughening treatment is carried out on the two circumferential end surfaces of the precast concrete arc-shaped duct piece; thus being beneficial to improving the connection strength of the expansion concrete and the precast concrete arc-shaped duct piece.
Further, the length of the tenons is smaller than the depth of the tenons, so that the two arc-shaped duct pieces can be in perfect contact, and the structural stability of the pipeline is enhanced under the condition of ensuring the design of prestress.
Further, the pushing device comprises a rotating handle, a rotating sleeve, a ball bearing and a pushing rod, one end of the rotating handle is located on the inner side of the precast concrete arc-shaped duct piece, the other end of the rotating handle is located in the precast concrete arc-shaped duct piece and is provided with a handle bevel gear, the rotating sleeve is provided with a sleeve bevel gear meshed with the handle bevel gear, the rotating sleeve is fixedly connected with an inner ring of the ball bearing, an outer ring of the ball bearing is fixedly embedded in the precast concrete arc-shaped duct piece, the pushing rod is arranged in the rotating sleeve, the rotating sleeve is in threaded connection with the pushing rod, and the pushing rod can do linear motion and stretches out from the bottom of the concave tenon to be abutted to the convex tenon.
Further, the annular steel wire is formed into an annular shape by welding or formed into an annular shape by an anchor.
Further, a steel plate for receiving the annular steel wire is arranged at the bottom of the reserved groove. The steel plate adopts a thin steel plate to bear the pressure of the annular steel wire on the precast concrete arc-shaped duct piece, and the stress concentration condition of the joint of the annular steel wire and the precast concrete arc-shaped duct piece is improved.
Further, the diameter of the reserved groove of the precast concrete arc-shaped duct piece is larger than that of the annular steel wire.
Further, the water-cement ratio of the expansion concrete is in the range of 0.5-1.0.
Further, the expanded concrete is filled in a connecting gap between two adjacent precast concrete arc-shaped duct pieces in a high-pressure grouting mode. Preferably, the grouting pressure of the high-pressure grouting is 0.4-0.6 MPa.
Further, the concrete grade of the expanded concrete is not lower than that of the precast concrete arc-shaped duct pieces.
Further, the outer sides of the precast concrete arc-shaped duct pieces and the expanded concrete are also provided with protective layer concrete, and the thickness of the protective layer concrete is not less than 20mm. The protection layer concrete can seal the annular steel wire in the pipeline, so that the pipeline is prevented from being corroded in the use process, and the durability of the pipeline is improved.
Based on the same inventive concept, the invention also relates to a manufacturing method of the circumferential prestress pipeline structure, which mainly comprises the following steps:
A. prefabricating more than two precast concrete arc-shaped duct pieces, wherein a reserved groove extending along the circumferential direction is formed in the outer side face of each precast concrete arc-shaped duct piece, and a steel plate is placed at the bottom of each reserved groove; the two ends of the prefabricated concrete arc-shaped duct piece in the circumferential direction are respectively provided with a tenon and a mortise, and the bottom of the mortise of the prefabricated concrete arc-shaped duct piece (1) is provided with a pushing device (2) for adjusting the interval between two adjacent prefabricated concrete arc-shaped duct pieces (1);
B. prefabricating the steel wire into a ring according to the designed diameter to form an annular steel wire;
C. splicing more than two precast concrete arc segments into a circular shape, sleeving annular steel wires in reserved grooves of all the precast concrete arc segments, and forming gaps between two adjacent precast concrete arc segments;
D. installing a gap template at the circumferential end part of the precast concrete arc-shaped duct piece, wherein the gap template simultaneously clamps the inner and outer surfaces of two adjacent precast concrete arc-shaped duct pieces;
E. the distance between two adjacent precast concrete arc segments (1) is adjusted through the pushing device (2), so that the annular steel wire (3) reaches preset prestress;
F. injecting expanded concrete slurry into a gap between two adjacent precast concrete arc-shaped duct pieces at high pressure;
G. and curing the pipeline, and after the expansion of the expanded concrete, completing the prestress application to the pipeline, and dismantling the gap template.
Further, the step G is followed by the steps of: and casting protective layer concrete on the outer sides of the precast concrete arc-shaped duct pieces and the expanded concrete, wherein the thickness of the protective layer concrete is not less than 20mm, and curing after casting.
The beneficial effects of the invention are as follows:
1) The circumferential prestress technology can realize prefabrication construction of a pipeline structure, two adjacent precast concrete arc-shaped duct pieces are connected by using the expanded concrete, the expanded concrete and the precast concrete arc-shaped duct pieces are integrated into a whole, and the water seepage resistance of the pipeline is improved. The expansive (self-stress) concrete used for high-pressure grouting has the characteristics of strong impermeability, early rapid hardening, high later strength, sulfate resistance and the like.
2) The high-strength steel wire is tightly clung to the reserved groove surrounding the prefabricated concrete arc-shaped duct piece, the auxiliary thrustor and the self-expansibility of the expanded concrete are used for increasing the connection gap between two adjacent prefabricated concrete arc-shaped duct pieces, and the prefabricated concrete arc-shaped duct pieces are forced to move outwards, so that the annular high-strength steel wire provides annular prestress for the pipeline, the traditional anchoring technology is changed, and the loss of curve prestress is fundamentally avoided.
3) According to the annular prestressed pipeline structure, a complex steel wire tensioning tool is not needed, and as the diameter of a circle surrounded by more than two precast concrete arc segments is smaller than that of an annular steel wire, the annular steel wire can be very simply placed in a reserved groove of the precast concrete arc segment, and the precast concrete arc segment is moved outwards after the annular steel wire is placed to generate a gap for injecting expanded concrete, so that the complicated process of penetrating steel wires (steel strands) in the prior art is avoided, the construction is simplified, the cost is reduced, and manpower and material resources are saved. Most importantly, the curve prestress loss is reduced.
Drawings
FIG. 1 is a schematic view of one embodiment of a circumferentially prestressed pipe structure according to the present invention;
FIG. 2 is a schematic view of a circumferentially prestressed pipe structure with 1/2 section pipe removed;
FIG. 3 is a schematic cross-sectional view of a circumferential prestressed pipe structure;
FIG. 4 is a schematic view of the location of a precast concrete segment;
FIG. 5 is a schematic view of the distribution position of the annular steel wire;
FIG. 6 is a front view of the auxiliary pusher;
FIG. 7 is a southwest isometric view of the auxiliary ejector;
figure 8 is a southeast isometric view of the auxiliary ejector.
In the figure: 1. the prefabricated concrete arc-shaped duct piece comprises 2 parts of pushing devices, 3 parts of annular steel wires, 4 parts of protective layer concrete, 5 parts of expanded concrete, 6 parts of reserved grooves, 7 parts of gap templates, 21 parts of rotating handles, 22 parts of gear built-in spiral sleeves, 23 parts of steel ball rollers, 24 parts of spiral pushing rods.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1-8, the circular prestress pipe structure has a cross section structure as shown in fig. 1 and 3, and comprises three precast concrete arc-shaped pipe pieces 1 spliced with each other, wherein tenons and tenons are respectively arranged at the two ends of each precast concrete arc-shaped pipe piece 1 in the circular direction, two adjacent precast concrete arc-shaped pipe pieces 1 are spliced through the tenons and the tenons, expanded concrete 5 is arranged between the two adjacent precast concrete arc-shaped pipe pieces 1, the precast concrete arc-shaped pipe pieces 1 and the expanded concrete 5 form a circular pipe together, and the expanded concrete 2 is formed by high-pressure grouting; the bottom of the tenon is provided with a pushing device 2 for adjusting the distance between two adjacent precast concrete arc-shaped duct pieces 1, and the distance between the two adjacent precast concrete arc-shaped duct pieces 1 can be adjusted through the pushing device 2 so that the annular steel wire 3 forms preset annular prestress; the prefabricated concrete arc segment 1 is provided with the reservation recess 6 on the lateral surface, be provided with the annular steel wire 3 that is used for the three prefabricated concrete arc segments 1 of constraint in the reservation recess 6, the reservation recess 6 preferably can set up a plurality of to set up many annular steel wires 3 on prefabricated concrete arc segment 1, the expansion concrete 5 has the trend of increase in the clearance between the adjacent prefabricated concrete arc segment 1 in the inflation in-process, and the prefabricated concrete arc segment 1 of outwards expanding forms the pulling force to annular steel wire 3, thereby produces hoop prestressing force to the pipeline. It should be noted that, although the technical solution of three precast concrete arc segments 1 is adopted in the present embodiment, the present invention may also adopt two, four or more than four precast concrete arc segments 1 to be combined to form a circumferential prestress pipeline structure.
The pushing device 2 comprises a rotating handle 21, a rotating sleeve 22, a ball bearing 23 and a pushing rod 24, one end of the rotating handle 21 is located at the inner side of the precast concrete arc-shaped duct piece 1, the other end of the rotating handle is located in the precast concrete arc-shaped duct piece 1 and is provided with a handle bevel gear, the rotating sleeve 22 is provided with a sleeve bevel gear meshed with the handle bevel gear, the rotating sleeve 22 is fixedly connected with an inner ring of the ball bearing 23, an outer ring of the ball bearing 23 is fixedly embedded in the precast concrete arc-shaped duct piece 1, the pushing rod 24 is arranged in the rotating sleeve 22 and is in threaded connection with the pushing rod 24, and the pushing rod 24 can do linear motion and stretches out from the bottom of the tenon to be in butt joint. Among them, those skilled in the art will understand: the pushing rod 24 can be provided with an axial guide groove or guide bar for limiting the rotation of the pushing rod 24, and the guide groove or guide bar is matched with the precast concrete arc-shaped duct piece 1 to realize the linear motion of the pushing rod 24; when the rotary handle 21 is rotated, the rotary handle 21 drives the rotary sleeve 22 to rotate, the rotary sleeve 22 drives the pushing rod 24 to linearly move, and the pushing rod 24 is abutted to the tenons, so that the adjustment of the distance between two adjacent precast concrete arc segments 1 is realized.
The mixing proportion, the expansion material and the mixing amount of the expansion concrete are all determined by experiments. Before the test, the test is carried out by adopting the constraint conditions and the maintenance conditions which are the same as those of the pipeline structure according to the expansion rate, the expansion speed, the concrete strength and the cement and the aggregate which are necessary for the structure, so that the required type and the doping amount of the expansion agent are obtained, and the designed prestress is achieved.
The water-cement ratio of the expansion concrete is in the range of 0.5-1.0.
The concrete grade of the expanded concrete 5 is not lower than that of the precast concrete segment 1.
The high-pressure grouting is characterized in that self-stress concrete slurry added with waterproof materials is special-purpose high-pressure grouting, the expanded concrete slurry added with the waterproof materials is injected into gaps between two adjacent precast concrete arc segments 1 at high pressure through high-pressure grouting equipment, the gaps are filled, a large amount of carbon dioxide gas is released along with crosslinking reaction after water is met, secondary osmotic pressure is generated, and an elastomer is pressed into and fills all gaps through high-pressure thrust and secondary osmotic pressure, so that the purpose of leakage prevention is achieved. The grouting pressure is 0.4-0.6 MPa.
The circumferential two end surfaces of the precast concrete arc-shaped duct piece 1 are subjected to grooving, grooving or roughening treatment; this is advantageous in improving the connection strength of the expanded concrete 5 and the precast concrete segment 1.
Preferably, the length of the tenons is smaller than the depth of the tenons, so that the two arc-shaped duct pieces can be in perfect contact. This may allow for an enhanced structural stability of the pipe under conditions that ensure design pre-stress.
Preferably, the annular steel wire 3 is formed in an annular shape by welding or by an anchor. When the annular steel wire is formed by adopting the anchor, the anchor can be placed in a gap between two adjacent precast concrete arc-shaped duct pieces 1 and then is covered by the expanded concrete.
Preferably, the bottom of the pre-groove 6 is provided with a steel plate for receiving the annular steel wire 3. The steel plate adopts a thin steel plate to bear the pressure of the annular steel wire on the precast concrete arc-shaped duct piece, and the stress concentration condition of the joint of the annular steel wire and the precast concrete arc-shaped duct piece is improved. The diameter of the pregroove 6 is larger than the diameter of the annular steel wire 3.
Example 2
On the basis of the embodiment 1, the circumferential prestress pipeline structure is further provided with protective layer concrete 4 with the thickness not smaller than 20mm at the outer sides of the precast concrete arc-shaped duct pieces and the expanded concrete. The protection layer concrete can seal the annular steel wire in the pipeline, so that the pipeline is prevented from being corroded in the use process, and the durability of the pipeline is improved.
The invention also provides a manufacturing method of the circumferential prestress pipeline structure, which comprises the following specific implementation steps:
1. firstly, manufacturing a precast concrete arc-shaped duct piece 1 according to a conventional pouring method and a design drawing, and arranging a reserved groove 6 outside the precast concrete arc-shaped duct piece 1, wherein the diameter of the reserved groove 6 is slightly larger than that of the annular steel wire 3.
2. After the prefabricated concrete arc-shaped duct piece 1 is disassembled, residual particles or protrusions on the surface of the arc-shaped section of the duct piece are cleaned, and grooving, grooving or galling (friction force between the arc-shaped section of the duct piece 1 and the expanded concrete 2 is increased) is carried out on the end faces of the two circumferential ends of the prefabricated concrete arc-shaped duct piece 1.
3. The annular steel wire 3 is wound in a reserved groove 6 on the precast concrete arc-shaped duct piece 1 and is tightly attached to the precast concrete arc-shaped duct piece.
4. And installing gap templates 7 at the two circumferential ends of the precast concrete arc-shaped duct piece 1, and simultaneously clamping the inner and outer surfaces of two adjacent precast concrete arc-shaped duct pieces 1 by the gap templates 7.
5. The distance between two adjacent precast concrete arc segments 1 is adjusted through the pushing device 2, so that the annular steel wire 3 reaches preset prestress;
6. after the pushing reaches the preset prestress, injecting the expanded concrete into a gap between two adjacent precast concrete arc segments at high pressure, and adjusting the mixing ratio, the expansion material and the doping amount of the expanded concrete to enable the prestress to be slightly larger than the design prestress;
7. and pouring protective layer concrete 4 of the annular steel wire 3, wherein the protective layer concrete 4 is positioned outside the precast concrete arc-shaped duct piece 1 and the expanded concrete 2 and is annular, the thickness of the protective layer concrete is not less than 20mm, and the manufacture of the annular prestress pipeline structure is completed after pouring and maintenance.
The circumferential prestress pipeline structure provided by the invention can bear great pressure, so that the traditional anchoring problem is changed, and curve prestress loss is fundamentally avoided. The self-stress (expansion) concrete used for high-pressure grouting has the characteristics of strong impermeability, early rapid hardening, high later strength, sulfate resistance and the like. The manufacturing method provided by the invention can realize prefabrication and assembly, is simple in construction, safe and reliable, and expands the application field of the annular prestress pipeline structure.
The embodiments of the present invention have been described above with reference to the accompanying drawings, and the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict. The present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the invention and the scope of the appended claims, which are all within the scope of the invention.
Claims (8)
1. The utility model provides a hoop prestressing force pipeline structure, its includes precast concrete arc section of jurisdiction (1) of mutually concatenation more than two, its characterized in that: two adjacent precast concrete arc-shaped duct pieces (1) are connected through expanded concrete (5), a reserved groove (6) extending along the circumferential direction is formed in the outer side face of each precast concrete arc-shaped duct piece (1), tenons and tenons are respectively formed in the two circumferential ends of each precast concrete arc-shaped duct piece (1), and the two adjacent precast concrete arc-shaped duct pieces (1) are spliced through the tenons and the tenons; the annular prestress pipeline structure further comprises annular steel wires (3) arranged in the reserved grooves (6) and pushing devices (2) used for adjusting the distance between two adjacent precast concrete arc-shaped duct pieces (1);
the pushing device (2) comprises a rotating handle (21), a rotating sleeve (22), a ball bearing (23) and a pushing rod (24), one end of the rotating handle (21) is located at the inner side of the precast concrete arc-shaped duct piece (1), the other end of the rotating handle is located in the precast concrete arc-shaped duct piece (1) and is provided with a handle bevel gear, the rotating sleeve (22) is provided with a sleeve bevel gear meshed with the handle bevel gear, the rotating sleeve (22) is fixedly connected with the inner ring of the ball bearing (23), the outer ring of the ball bearing (23) is fixedly embedded in the precast concrete arc-shaped duct piece (1), the pushing rod (24) is arranged in the rotating sleeve (22), the rotating sleeve (22) is in threaded connection with the pushing rod (24), and the pushing rod (24) can do linear motion and stretches out from the bottom of the concave tenon to be abutted to the tenon; the bottom of the reserved groove (6) is provided with a steel plate for bearing the annular steel wire (3).
2. The circumferential prestress pipeline structure according to claim 1, wherein the circumferential two end surfaces of the precast concrete arc segment (1) are subjected to roughening treatment; the length of the tenons is smaller than the depth of the tenons.
3. A circumferentially prestressed pipe structure according to claim 1, characterized in that the water-cement ratio of said expanded concrete (5) is in the range of 0.5-1.0.
4. The circumferential prestressed pipe structure according to claim 1, wherein said expanded concrete (5) is filled in a gap between adjacent two of said precast concrete segments by means of high pressure grouting; the grouting pressure of the high-pressure grouting is 0.4-0.6 MPa.
5. A circumferentially prestressed pipe structure according to claim 1, characterized in that the concrete grade of said expanded concrete (5) is not lower than the concrete grade of the precast concrete segment (1).
6. The circumferential prestressed pipe structure according to claim 1, wherein the outer sides of the precast concrete segment (1) and the expanded concrete (5) are further provided with protective layer concrete (4) having a thickness of not less than 20mm.
7. A method of making a circumferentially prestressed pipe structure as recited in claim 1, comprising the steps of:
A. prefabricating more than two precast concrete arc segments (1), wherein a reserved groove (6) extending along the circumferential direction is formed in the outer side surface of each precast concrete arc segment (1), a steel plate is placed at the bottom of each reserved groove (6), tenons and tenons are respectively arranged at the circumferential two ends of each precast concrete arc segment (1), and a pushing device (2) for adjusting the distance between every two adjacent precast concrete arc segments (1) is arranged at the bottom of each tenon of each precast concrete arc segment (1);
B. prefabricating the steel wire into a ring according to the designed diameter to form an annular steel wire (3);
C. more than two precast concrete arc segments (1) are spliced into a circular ring shape, annular steel wires (3) are sleeved in reserved grooves (6) of all the precast concrete arc segments (1), and gaps are reserved between two adjacent precast concrete arc segments (1);
D. a gap template (7) is arranged at the circumferential end part of the precast concrete arc-shaped duct piece (1), and the gap template (7) clamps the inner surface and the outer surface of two adjacent precast concrete arc-shaped duct pieces (1) simultaneously;
E. the distance between two adjacent precast concrete arc segments (1) is adjusted through the pushing device (2), so that the annular steel wire (3) reaches preset prestress;
F. injecting expanded concrete slurry at high pressure in a gap between two adjacent precast concrete arc-shaped duct pieces (1);
G. and curing the pipeline, and after the expansion of the expanded concrete, completing the prestress application to the pipeline, and dismantling the gap template (7).
8. The method of manufacturing a circumferentially prestressed pipe structure according to claim 7, further comprising the steps of, after said step G: and casting protective layer concrete (4) on the outer sides of the precast concrete arc-shaped duct pieces (1) and the expanded concrete (5), wherein the thickness of the protective layer concrete (4) is not less than 20mm, and curing after casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810706850.1A CN108729346B (en) | 2018-07-02 | 2018-07-02 | Circumferential prestress pipeline structure and manufacturing method thereof |
Applications Claiming Priority (1)
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| CN113073995B (en) * | 2021-03-30 | 2021-12-07 | 深圳大学 | Self-resetting prestressed pipe piece structure and assembling method thereof |
| CN117249312B (en) * | 2023-08-23 | 2024-05-07 | 保定市水泥制管有限公司 | Permeation-proof concrete pipeline and production process thereof |
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| CN102536265A (en) * | 2012-02-03 | 2012-07-04 | 葛洲坝集团第五工程有限公司 | Shield tunneling prestress lining construction method and used prestressed pipe pieces |
| CN204492834U (en) * | 2015-01-27 | 2015-07-22 | 济南轨道交通集团有限公司 | The prestress die numerical expression section of jurisdiction that in a kind of tunnel, semi-ring is reinforced |
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| CN104612706B (en) * | 2015-01-27 | 2016-09-21 | 济南轨道交通集团有限公司 | In a kind of tunnel the domain reinforce prestress die numerical expression section of jurisdiction and construction method |
| WO2017081990A1 (en) * | 2015-11-11 | 2017-05-18 | 鹿島建設株式会社 | Precast structure, and construction method for underground structures |
| CN208395643U (en) * | 2018-07-02 | 2019-01-18 | 长沙理工大学 | Hoop prestressed pipeline structure |
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| CN102536265A (en) * | 2012-02-03 | 2012-07-04 | 葛洲坝集团第五工程有限公司 | Shield tunneling prestress lining construction method and used prestressed pipe pieces |
| CN204492834U (en) * | 2015-01-27 | 2015-07-22 | 济南轨道交通集团有限公司 | The prestress die numerical expression section of jurisdiction that in a kind of tunnel, semi-ring is reinforced |
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