CN220035891U - Graded pouring unbonded prestressed concrete structure - Google Patents
Graded pouring unbonded prestressed concrete structure Download PDFInfo
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- CN220035891U CN220035891U CN202321324364.6U CN202321324364U CN220035891U CN 220035891 U CN220035891 U CN 220035891U CN 202321324364 U CN202321324364 U CN 202321324364U CN 220035891 U CN220035891 U CN 220035891U
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- prestressed
- pouring
- concrete structure
- tensioning
- tendons
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- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 52
- 239000004567 concrete Substances 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 210000002435 tendon Anatomy 0.000 claims description 59
- 239000004033 plastic Substances 0.000 claims description 21
- 229920000742 Cotton Polymers 0.000 claims description 19
- 238000004873 anchoring Methods 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 229920006333 epoxy cement Polymers 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000011150 reinforced concrete Substances 0.000 abstract description 3
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Abstract
The utility model provides a graded pouring unbonded prestressed concrete structure, which comprises a bottom layer steel bar, wherein the concrete is poured onto the bottom layer steel bar and comprises a pre-pouring belt and a post-pouring belt, the post-pouring belt is positioned between the two pre-pouring belts, the graded pouring unbonded prestressed concrete structure further comprises an unbonded prestressed component, the unbonded prestressed concrete component at least comprises a prestressed rib penetrating through the post-pouring belt, two tensioning ends penetrate through the pre-pouring belt and then are embedded on the post-pouring belt, but do not penetrate through the post-pouring belt, and the other ends are respectively arranged in the pre-pouring belts at two sides. The concrete structure described by the utility model has the advantages of fully playing the respective characteristics of the reinforced concrete and the concrete, improving the rigidity, the crack resistance, the durability and the like of the reinforced concrete member.
Description
Technical Field
The utility model relates to the technical field of constructional engineering, in particular to a non-binding prestressed concrete structure which is used in a structural slab with overlength and large span and is poured in a grading manner.
Background
The unbonded prestressed construction is a relatively mature process, and the unbonded prestressed concrete technology is popularized and applied simply and quickly because no pore canal is reserved and grouting is not needed.
At present, unbonded prestress construction is mostly applied to bridge engineering, namely building engineering structures, but is lack of application in structural plates with extra long and large spans of other plates, the integral structure of the structural plates is large, the shrinkage influence of concrete is increased, and along with temperature change, temperature stress is generated, the concrete is easy to crack, so that the structural plates are in a tensile stress state by using unbonded prestress technology, and therefore, partial internal stress generated by temperature change or self shrinkage and other reasons is counteracted, the formation of cracks is reduced, and the improvement of structural rigidity is a very important research direction.
Disclosure of Invention
The object of the present utility model is to provide a graded cast unbonded prestressed concrete structure solving one or more of the above mentioned problems of the prior art.
The utility model provides a graded pouring unbonded prestressed concrete structure, which comprises a bottom layer steel bar, wherein the concrete is poured onto the bottom layer steel bar to form two kinds of pouring belts which are connected with each other, the two kinds of pouring belts are respectively a pre-pouring belt and a post-pouring belt, the post-pouring belt is positioned between the two pre-pouring belts, the pouring time of the pre-pouring belt is earlier than that of the post-pouring belt,
the non-binding prestressed concrete structure of the graded pouring further comprises one or more groups of non-binding prestressed concrete components, wherein each group of non-binding prestressed concrete components at least comprises three prestressed tendons distributed along the length direction of the non-binding prestressed concrete components, and each group of non-binding prestressed concrete components
The prestressed tendons pass through the post-cast strip, and the two side end parts of the prestressed tendons are arranged in the pre-cast strips on the two sides; the tensioning ends of the two prestressed tendons penetrate through the pre-cast strip and then are embedded on the post-cast strip, the other ends of the two prestressed tendons are respectively arranged in the pre-cast strips at two sides, the two prestressed tendons do not penetrate through the post-cast strip, and the prestress of the non-binding prestressed concrete structure which is poured in a grading manner is sealed through the structural design.
In some embodiments, the prestressed tendons in the unbonded prestressed assemblies are staggered, and the front-back staggered distance of the tensioning ends of two adjacent prestressed tendons in the same unbonded prestressed assembly is greater than or equal to 500 mm.
In some embodiments of the present utility model, in some embodiments,
one end of the prestressed tendon is a tensioning end, and the other end of the prestressed tendon is an anchoring end;
or (b)
Both ends of the prestressed tendons are tensioning ends;
the tensioning end is provided with a tensioning assembly, and the tensioning assembly comprises a first spiral rib, a backing plate and a first anchorage device which are sequentially sleeved on the prestressed rib from inside to outside;
the anchoring end is provided with an anchor.
In some embodiments, the anchor is comprised of a squeeze anchor, a bearing plate, and a second helical rib, with a recessed concrete surface arrangement.
In some embodiments, a reserved Zhang Lacao is arranged on the pouring belt where the tensioning end of the prestressed tendon is positioned through a reserved die, the reserved die is sleeved on the prestressed tendon with the exposed tensioning end,
the reserved mould comprises a PVC pipe and rubber-plastic cotton, wherein the rubber-plastic cotton is wrapped on a prestressed rib with an exposed tensioning end and is fixed by an auxiliary fixing piece, the PVC pipe is sleeved outside the rubber-plastic cotton, and the outer side wall of the PVC pipe is coated with a release agent, so that the reserved mould can be conveniently removed after the concrete reaches an initial setting state through the release agent;
the auxiliary fixing piece is an adhesive tape. The reserved mould that this involved is demolishd conveniently, repeatedly usable can guarantee the utilization ratio of material, and the concrete pollution is avoided the prestressed reinforcement isotructure in the reserved tensioning groove when concreting simultaneously through this reserved mould's design and is polluted, provides convenience for the processing of prestressing reinforcement in the later stage.
In some embodiments, the PVC pipe is a Φ75PVC pipe and the rubber and plastic cotton is 30 mm thick.
In some embodiments, the length of the prestressed tendons exposed at the tensioning end is 1.5 times or more and 30 mm or more of the diameter of the prestressed tendons, and epoxy resin cement is coated on the prestressed tendons exposed at the tensioning end and the first anchorage device, so that the unbonded prestressed concrete structure with graded pouring forms a closed system, harmful substances are prevented from corroding such as the prestressed tendons caused in the unbonded prestressed concrete structure with graded pouring, and meanwhile, the bonding between materials in different time periods can be enhanced.
In some embodiments, reserved Zhang Lacao is filled with a specialized concrete having a strength that is one strength grade higher than the strength of a graded poured unbonded prestressed concrete structure.
In some embodiments, the special concrete is micro-expansion fine stone concrete, and the outer side surface of the special concrete after filling and curing is coated with waterproof paint, so that corrosion of prestressed tendons, first anchors and the like in the reserved tensioning groove caused by external harmful substances entering the reserved tensioning groove is further prevented.
In some embodiments, the tendon is a high strength, low relaxation unbonded prestressed steel strand.
The non-binding prestressed concrete structure with graded pouring has the advantages that:
the method is suitable for a structure body with a larger span (a flat plate with a span of more than 6 meters, a common span of a unidirectional plate is 6-9 meters, a common span of a bidirectional plate is 7-12 meters, and a live load is less than 5 KN/square meter), and the comprehensive economic benefit on the structure body with the larger span is better; the respective characteristics of the steel bars and the concrete can be fully developed, the rigidity, the crack resistance and the durability of the reinforced concrete member are improved, and the high-strength steel bars and the high-strength grade concrete can be effectively utilized; compared with common ground concrete, the non-binding prestressed concrete structure with graded pouring has the advantages of small component section, light dead weight, good quality and material saving (30% -40% of the concrete can be saved and 20% -40% of the concrete can be saved) under the same conditions.
Drawings
FIG. 1 is a schematic distribution of unbonded prestressed components in a graded cast unbonded prestressed concrete structure in some embodiments of the utility model;
FIG. 2 is a schematic view of the cross-sectional structure of the C-C in FIG. 1;
FIG. 3 is an enlarged view of portion A-a of FIG. 1;
fig. 4 is an enlarged view of the portion a-b of fig. 1.
Detailed Description
Referring to fig. 1 to 4, the present embodiment proposes a hierarchical poured unbonded prestressed concrete structure including a bottom layer reinforcement, and two kinds of pouring belts connected to each other formed by pouring concrete onto the bottom layer reinforcement, the two kinds of pouring belts being a pre-pouring belt 1 and a post-pouring belt 2, respectively, the post-pouring belt 2 being located between the two pre-pouring belts 1, the pouring time of the pre-pouring belt 1 being earlier than the pouring time of the post-pouring belt 2,
the non-binding prestressed concrete structure of the graded pouring also comprises one or more groups of non-binding prestressed concrete components, wherein each group of non-binding prestressed concrete components at least comprises three prestressed ribs 3 distributed along the length direction of the non-binding prestressed concrete components, and each group of non-binding prestressed concrete components
The prestressed tendons 3 are cross-prestressed tendons which pass through the post-cast strip 2, and the end parts of the two sides of the cross-prestressed tendons are arranged in the pre-cast strips 1 on the two sides; the tensioning ends of the two prestressed tendons 2 penetrate through the pre-cast strip 1 and then are embedded on the post-cast strip 2, the other ends of the two prestressed tendons 3 are respectively arranged in the pre-cast strips 1 at two sides, the two prestressed tendons 3 do not penetrate through the post-cast strip 2, and the prestress of the non-binding prestressed concrete structure of the graded pouring is sealed through the structural design.
The prestressed tendons in the unbonded prestressed assembly are staggered, and the front-back (front-back direction is the direction vertical to the length direction of the unbonded prestressed concrete assembly on the horizontal plane) staggered distance of the tensioning ends of two adjacent prestressed tendons in the same unbonded prestressed assembly is more than or equal to 500 mm.
One end of the prestressed tendon is a tensioning end, and the other end is an anchoring end;
or (b)
Both ends of the prestressed tendons are tensioning ends;
the tensioning end is provided with a tensioning assembly which comprises a first spiral rib 311, a backing plate 312 and a first anchorage 313 which are sleeved on the prestressed rib from inside to outside in sequence;
the anchoring end is provided with an anchor, and the anchor consists of an extrusion anchor 321, a bearing plate 322 and a second spiral rib 323, and is arranged on the surface of recessed concrete.
A reserved Zhang Lacao is arranged on the pouring belt where the tensioning end of the prestressed tendon is positioned through a reserved die, the reserved die is sleeved on the prestressed tendon with the exposed tensioning end,
the reserved mould comprises a PVC pipe and rubber-plastic cotton, wherein the rubber-plastic cotton is wrapped on the prestressed tendons exposed at the tensioning end and fixed by using an auxiliary fixing piece, the PVC pipe is sleeved outside the rubber-plastic cotton, and the outer side wall of the PVC pipe is coated with a release agent; wherein the auxiliary fixing piece can be an adhesive tape.
The length of the prestressed reinforcement exposed out of the tensioning end is more than or equal to 1.5 times and more than or equal to 30 mm of the diameter of the prestressed reinforcement, and epoxy resin cement is coated on the prestressed reinforcement and the anchorage device exposed out of the tensioning end, so that the non-binding prestressed concrete structure cast in a grading manner forms a closed system.
The reserved Zhang Lacao is filled with special concrete, the strength of the special concrete is one strength grade higher than that of the non-bonding prestressed concrete structure poured in a grading manner, wherein the special concrete can be micro-expansion fine stone concrete, and the outer side surface of the special concrete after filling and curing is coated with waterproof paint.
In some specific implementations, the method for constructing the non-bonded prestressed concrete structure by casting in stages includes the following steps:
setting a bottom layer of steel bars, connecting a plurality of groups of unbonded prestressed components on the bottom layer of steel bars by binding wires according to the requirement, wherein each group of unbonded prestressed concrete components at least comprises three prestressed bars 3 which are arranged in parallel along the length direction of the unbonded prestressed concrete components, straightening and straightening all the prestressed bars 3 in the arrangement process, and additionally arranging supporting steel bars between the bottom layer of steel bars and the prestressed bars 3 to control the vertical height of the prestressed bars, wherein the prestressed bars in the unbonded prestressed components are staggered, and the front-back staggered distance of the tensioning ends of two adjacent prestressed bars in the same unbonded prestressed component is more than or equal to 500 mm;
one end of the prestressed tendon 3 is a tensioning end, and the other end is an anchoring end;
or (b)
Both ends of the prestressed tendons 3 are tensioning ends;
the tensioning end is provided with a tensioning assembly which comprises a first spiral rib 311, a backing plate 312 and a first anchorage 313 which are sleeved on the prestressed rib from inside to outside in sequence;
the anchoring end is provided with an anchor, and the anchor consists of an extrusion anchor 321, a bearing plate 322 and a second spiral rib 323, and is arranged on the surface of recessed concrete.
The part, which needs to be exposed, of the stretching end of the prestressed tendon 3 arranged on the pre-pouring belt is wrapped with rubber-plastic cotton and fixed by using an adhesive tape, and then the outer side of the rubber-plastic surface is sleeved with a PVC pipe, wherein the outer side wall of the PVC pipe is coated with a release agent, the PVC pipe can be a phi 75PVC pipe, and the rubber-plastic cotton can be a rubber-plastic cotton with the thickness of 30 mm.
After the PVC pipe is installed, firstly performing concrete pouring on a pouring belt which is poured firstly according to the requirement to form a pouring belt 1, dismantling the PVC pipe and rubber-plastic cotton on the pouring belt after initial setting of the concrete, and forming a reserved tension groove on the pouring belt 1 after dismantling;
after the concrete in the pre-cast strip 1 reaches the pre-designed strength, tensioning the prestressed tendons which do not pass through the post-cast strip 2, so as to realize the pre-stressing of the concrete, fully and uniformly transmitting the stress after tensioning, wrapping rubber-plastic cotton on the part, which needs to be exposed, of the prestressed tendons 3 on the post-cast strip, which are arranged with the reserved tensioning groove, and fixing the part by using an adhesive tape, and then sleeving a PVC pipe on the outer side of the rubber-plastic surface, wherein the outer side wall of the PVC pipe is coated with a release agent, the PVC pipe can be a phi 75PVC pipe, and the rubber-plastic cotton can be a rubber-plastic cotton with the thickness of 30 mm. And pouring the post-pouring belt 2, dismantling the PVC pipe and the rubber-plastic cotton on the post-pouring belt when the concrete of the post-pouring belt is initially set, forming a reserved tensioning groove on the dismantled post-pouring belt 2, tensioning and penetrating through the prestressed tendons of the post-pouring belt 2 after the concrete in the post-pouring belt 2 reaches the pre-designed strength, and sealing the prestress of the whole upper cover structure plate.
And after the operation is finished, the excess exposed tendons are cut off by using a grinder, so that the length of the prestressed tendons exposed at the tensioning end is not less than 1.5 times of the diameter of the prestressed tendons and not less than 30 mm, and epoxy resin cement is coated on the prestressed tendons exposed at the tensioning end and the anchor, so that the unbonded prestressed concrete structure cast in a grading manner forms a closed system. And then, reserving Zhang Lacao and filling micro-expansion fine stone concrete with a strength grade higher than that of the non-bonded prestressed concrete structure poured in a grading way, wherein the outer side surface of the micro-expansion fine stone concrete after filling and curing is coated with waterproof paint.
The prestress rib can be selected from high-strength low-relaxation unbonded prestress steel strands.
The above-mentioned less serious matters can be directly realized by adopting the prior art, so that the detailed description is omitted here. The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several similar modifications and improvements can be made without departing from the inventive concept, and these should also be considered as being within the scope of the present utility model.
Claims (10)
1. The non-binding prestressed concrete structure with graded pouring is characterized by comprising a bottom layer of reinforced steel bars, wherein the concrete is poured on the bottom layer of reinforced steel bars to form two kinds of pouring belts which are connected with each other, the two kinds of pouring belts are respectively a pre-pouring belt and a post-pouring belt, the post-pouring belt is positioned between the two pre-pouring belts, the pouring time of the pre-pouring belt is earlier than that of the post-pouring belt,
the non-binding prestressed concrete structure of the graded pouring further comprises one or more groups of non-binding prestressed concrete components, wherein each group of non-binding prestressed concrete components at least comprises three prestressed tendons distributed along the length direction of the non-binding prestressed concrete components, and each group of non-binding prestressed concrete components
The prestressed tendons pass through the post-cast strip, and the two side end parts of the prestressed tendons are arranged in the pre-cast strips on the two sides; the tensioning ends of the two prestressed tendons penetrate through the pre-cast strip and then are embedded on the post-cast strip, the other ends of the two prestressed tendons are respectively arranged in the pre-cast strips at the two sides, and the two prestressed tendons do not penetrate through the post-cast strip.
2. The graded pouring unbonded prestressed concrete structure of claim 1, wherein the prestressed tendons in the unbonded prestressed modules are staggered, and the front-back staggered distance of the tensioning ends of two adjacent prestressed tendons in the same unbonded prestressed module is greater than or equal to 500 mm.
3. The graded cast unbonded prestressed concrete structure of claim 1, wherein,
one end of the prestressed tendon is a tensioning end, and the other end of the prestressed tendon is an anchoring end;
or (b)
Both ends of the prestressed tendons are tensioning ends;
the tensioning end is provided with a tensioning assembly, and the tensioning assembly comprises a first spiral rib, a backing plate and a first anchorage device which are sequentially sleeved on the prestressed rib from inside to outside;
the anchoring end is provided with an anchor.
4. A graded cast unbonded prestressed concrete structure as in claim 3, wherein the anchor means is comprised of extruded anchors, bearing plates and second helical ribs, arranged with a recessed concrete surface.
5. The hierarchical pouring unbonded prestressed concrete structure of claim 3, wherein the pouring belt on which the tensioning end of the prestressed tendon is positioned is provided with a reserved Zhang Lacao by a reserved die, the reserved die is sleeved on the prestressed tendon with the exposed tensioning end,
the reserved mould comprises a PVC pipe and rubber-plastic cotton, wherein the rubber-plastic cotton is wrapped on a prestressed rib with an exposed tensioning end and is fixed by an auxiliary fixing piece, the PVC pipe is sleeved outside the rubber-plastic cotton, and the outer side wall of the PVC pipe is coated with a release agent;
the auxiliary fixing piece is an adhesive tape.
6. The grading pouring unbonded prestressed concrete structure of claim 5, wherein the PVC pipe is a Φ75PVC pipe, and the rubber-plastic cotton is 30 mm thick.
7. The hierarchical pour unbonded prestressed concrete structure of claim 5, wherein the length of the prestressed tendons exposed at the tensioning ends is 1.5 times or more and 30 mm or more than the diameter of the prestressed tendons, and the prestressed tendons and the first anchors exposed at the tensioning ends are coated with epoxy cement.
8. The layered non-bonded prestressed concrete structure of claim 5, wherein reserved Zhang Lacao is filled with a special concrete having a strength that is one strength grade higher than the strength of the layered non-bonded prestressed concrete structure.
9. The graded cast unbonded prestressed concrete structure of claim 8, wherein the special concrete is micro-expansive fine stone concrete, and the outer side surface of the special concrete after filling and curing is coated with a waterproof coating.
10. The grading pour unbonded prestressed concrete structure of claim 1, wherein the tendons are high strength low relaxation unbonded prestressed steel strands.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321324364.6U CN220035891U (en) | 2023-05-29 | 2023-05-29 | Graded pouring unbonded prestressed concrete structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321324364.6U CN220035891U (en) | 2023-05-29 | 2023-05-29 | Graded pouring unbonded prestressed concrete structure |
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| Publication Number | Publication Date |
|---|---|
| CN220035891U true CN220035891U (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321324364.6U Active CN220035891U (en) | 2023-05-29 | 2023-05-29 | Graded pouring unbonded prestressed concrete structure |
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| Country | Link |
|---|---|
| CN (1) | CN220035891U (en) |
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2023
- 2023-05-29 CN CN202321324364.6U patent/CN220035891U/en active Active
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