CN110778139A - Local hole-opening construction method for unbonded prestressed tendon concrete slab - Google Patents
Local hole-opening construction method for unbonded prestressed tendon concrete slab Download PDFInfo
- Publication number
- CN110778139A CN110778139A CN201911002317.8A CN201911002317A CN110778139A CN 110778139 A CN110778139 A CN 110778139A CN 201911002317 A CN201911002317 A CN 201911002317A CN 110778139 A CN110778139 A CN 110778139A
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- Prior art keywords
- hole
- prestressed
- concrete
- anchor ring
- groove
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
- E04C5/122—Anchoring devices the tensile members are anchored by wedge-action
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0266—Enlarging
Abstract
A local hole-opening construction method for an unbonded prestressed reinforced concrete slab comprises the following steps: an artificial groove is arranged at the edge of the opening to be opened to expose the prestressed tendon; installing spiral indirect reinforcing steel bars and an open type bearing plate in the artificial groove to form a front groove and a rear groove, and pouring hole concrete in the front groove; installing a combined anchoring tool in the rear groove, and cutting off the prestressed tendons to form temporary anchoring; sleeving a hole die and an anchor ring on the end part of the prestressed tendon; tensioning the prestressed tendons, removing the combined anchoring tool, positioning the cavity die and the anchor ring to the end part of the rear groove, and clamping the clamping piece in the anchor ring; the jack returns oil, the prestressed tendons form permanent anchorage at the end part, and concrete and non-prestressed tendons in the area where the hole is planned to be opened are chiseled; filling the concrete into the anchoring end, and filling plugging materials into the cavity mold; and (5) carrying out edge sealing beam construction on the edge of the opening. The invention provides a practical construction method aiming at the improvement of the unbounded prestressed tendon concrete slab in the hole, the construction operation is safe and simple, and the stress level in the prestressed tendon can be effectively maintained.
Description
Technical Field
The invention relates to floor slab holing reconstruction in the civil construction industry, in particular to a local holing construction method for an unbonded prestressed tendon concrete slab.
Background
In the eighties and ninety years of the last century, a large number of civil houses with bottom layers and multi-storey masonry structures are built in cities and towns in China, and nowadays, along with the promotion of city updating, reinforcing and modifying of buildings in parts of areas are a preferable means because the cost of pushing old houses to reconstruct new houses is too high, the condition that elevators are additionally arranged on the buildings is often met in modification projects, and the arrangement of the elevators in the buildings needs to locally open holes in original structural floor slabs and appropriately reinforce the peripheries of the holes, so that the structure after reinforcement can be guaranteed to have a certain safety coefficient.
It is comparatively common to set up the entrance to a cave to ordinary reinforced concrete floor and install the elevator additional, and to unbonded prestressed concrete floor, the condition is exactly different, and the interim of prestressing tendons is cutd and the anchor is a big problem that needs to consider, if do not adopt any measure directly to cut or relax prestressing tendons, the dangerous condition that the tip anchor end popped out can take place, cause personnel or loss of property, and simultaneously, original stress level in the prestressing tendons can lose, can produce adverse effect to structural safety.
Disclosure of Invention
The invention aims to provide a local hole-opening construction method for an unbonded prestressed tendon concrete slab, which can solve the problem of influence of prestressed tendon truncation on the safety of a structure.
In order to solve the technical problem, the invention is solved by the following technical scheme:
a construction method for locally forming a hole in an unbonded prestressed reinforced concrete slab is characterized by comprising the following steps of: the construction method comprises the following steps:
a. positioning the hole and the peripheral prestressed tendons, and opening artificial grooves at the edge of the hole to expose the prestressed tendons; b. the method comprises the following steps that spiral indirect reinforcing steel bars and an open end plate are sequentially arranged in a manual groove, the open end plate divides the manual groove into a front groove and a rear groove, the spiral indirect reinforcing steel bars are located in the front groove, and hole filling concrete is poured in the front groove; c. installing a combined anchoring tool in the rear groove, and cutting off the prestressed tendons to enable the combined anchoring tool to form temporary anchoring at the end parts of the prestressed tendons; d. sleeving a hole die and an anchor ring on the end part of the prestressed tendon; e. tensioning the prestressed tendons, removing the combined anchoring tool, positioning the cavity die and the anchor ring to the end part of the rear groove, and clamping the clamping piece in the anchor ring; f. the prestressed tendons form permanent anchorage at the end parts, and concrete and non-prestressed tendons in the area to be perforated are removed; g. filling the concrete into the anchoring end, and filling plugging materials into the cavity mold; h. and (5) carrying out edge sealing beam construction on the edge of the opening.
Furthermore, the combined anchoring tool comprises an open type outer anchoring ring, a clamping type middle anchoring ring and an inner clamping piece, wherein the open type outer anchoring ring is a cylinder with a cylinder cavity and is locally opened at one side; the clamping type middle anchor ring is formed by combining two semi-cylindrical bearing sheets, and a truncated cone-shaped anchor hole is formed in the middle of the clamping type middle anchor ring; the inner clamping piece is formed by combining two semicircular platform body anchor pieces, and a cylindrical through hole is formed in the middle of the inner clamping piece; the inner clamping piece can be arranged in a circular truncated cone-shaped anchor hole of the clamping type middle anchor ring, and the clamping type middle anchor ring is arranged in a cylindrical cavity of the open type outer anchor ring.
Furthermore, the open type end plate is a common bearing plate or a connected bearing plate.
Further, the concrete for pouring the holes is common concrete or self-compacting concrete.
Furthermore, the plugging material is fine aggregate concrete or shrinkage-free mortar doped with an expanding agent.
The invention realizes no loss or small loss of stress level in the cutting process of the unbonded prestressed tendon, ensures safe temporary anchoring and permanent anchoring of the prestressed tendon in the hole-opening reconstruction of the unbonded prestressed concrete slab, ensures the durability and stability of the anchoring end in the later use stage by the permanent anchoring measure, and has safe and simple operation in the whole construction process.
Drawings
Fig. 1 is a view of temporary anchorage of tendons in unbonded prestressed tendon concrete slabs.
Fig. 2 is a view of the permanent anchorage of the tendon and the edge sealing of the opening in the unbonded prestressed tendon concrete slab.
Fig. 3 is a composition view of the modular anchoring tool.
The reference numbers are as follows:
the method comprises the steps of 1, artificial grooves 2, spiral indirect reinforcing steel bars 3, open type end plates 4, front grooves 5, rear grooves 6, hole pouring concrete 7, a combined anchoring tool 8, a hole mold 9, an anchor ring 10, clamping pieces 11, plugging materials 12, open type outer anchor rings 13, clamping type middle anchor rings 14 and inner clamping pieces.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings 1 to 3 and examples:
a local hole-opening construction method for an unbonded prestressed reinforced concrete slab comprises the following steps:
a. b, positioning a planned opening and peripheral prestressed tendons, arranging an artificial groove 1 at the edge of the opening to expose the prestressed tendons, and b, sequentially installing a spiral indirect reinforcing steel bar 2 and an open end plate 3 in the artificial groove 1 to form a front groove 4 and a rear groove 5, wherein the spiral indirect reinforcing steel bar is sleeved outside the prestressed tendons, the open end plate is provided with a notch at one side, and during installation, the notch inwards penetrates through the prestressed tendons to clamp the prestressed tendons into the notch, and the open end plate is fixed with the notch, so that the open end plate is not displaced during subsequent concrete pouring; pouring hole concrete 6 and c in the front groove 4, installing a combined anchoring tool 7 in the rear groove 5, as shown in fig. 3, wherein the combined anchoring tool 7 comprises an open outer anchor ring 12, a clamping type middle anchor ring 13 and an inner clamping piece 14, cutting off the prestressed tendons to form temporary anchoring at the end part, as shown in fig. 1, d, sleeving a hole mold 8 and an anchor ring 9 on the end part of the prestressed tendons, e, tensioning the prestressed tendons, dismantling the combined anchoring tool, positioning the hole mold 8 and the anchor ring 9 to the end part of the rear groove 5, clamping the clamping piece 10 in the anchor ring 9, f, returning oil by a jack, forming permanent anchoring at the end part of the prestressed tendons, chiseling out concrete and non-prestressed tendons in a region to be chiseled into the hole, as shown in fig. 2, g, filling concrete into an anchoring end, filling the hole mold 8 with plugging materials 11, h, and constructing a hole edge sealing beam.
Examples
As shown in fig. 3, the open outer anchor ring 12 is a cylinder with a cylindrical cavity and is partially open on one side. The clamping type middle anchor ring 13 is formed by combining two semi-cylindrical bearing sheets, and a truncated cone-shaped anchor hole is formed in the middle of the clamping type middle anchor ring. The inner clamping piece 14 is formed by combining two semicircular platform body anchor pieces, and a cylindrical through hole is formed in the middle. The installation is that the opening of the open type outer anchor ring 12 penetrates through the steel bar to be sleeved outside the prestressed steel bar, then two semi-cylindrical bearing sheets of the clamping type middle anchor ring 13 are inserted into the cylindrical cavity of the open type outer anchor ring 12, and finally two semi-circular truncated cone anchor sheets of the inner clamping sheet 14 are inserted into the circular truncated cone-shaped anchor hole of the clamping type middle anchor ring 13 and are compressed, so that the prestressed steel bar forms temporary anchoring at the end part.
The open type end plate 3 is a common bearing plate. The hole-pouring concrete 6 adopts self-compacting concrete. The plugging material 11 is fine stone concrete doped with an expanding agent.
The drawings and examples described above are only for illustrating the preferred embodiments of the present application and are not to be construed as limiting the scope of the present application, and those skilled in the art can make general changes, substitutions and modifications within the spirit and scope of the present application.
Claims (5)
1. A construction method for locally forming a hole in an unbonded prestressed reinforced concrete slab is characterized by comprising the following steps of: the construction method comprises the following steps:
a. positioning the hole and the peripheral prestressed tendons, and opening artificial grooves at the edge of the hole to expose the prestressed tendons; b. the method comprises the following steps that spiral indirect reinforcing steel bars and an open end plate are sequentially arranged in a manual groove, the open end plate divides the manual groove into a front groove and a rear groove, the spiral indirect reinforcing steel bars are located in the front groove, and hole filling concrete is poured in the front groove; c. installing a combined anchoring tool in the rear groove, and cutting off the prestressed tendons to enable the combined anchoring tool to form temporary anchoring at the end parts of the prestressed tendons; d. sleeving a hole die and an anchor ring on the end part of the prestressed tendon; e. tensioning the prestressed tendons, removing the combined anchoring tool, positioning the cavity die and the anchor ring to the end part of the rear groove, and clamping the clamping piece in the anchor ring; f. the prestressed tendons form permanent anchorage at the end parts, and concrete and non-prestressed tendons in the area to be perforated are removed; g. filling the concrete into the anchoring end, and filling plugging materials into the cavity mold; h. and (5) carrying out edge sealing beam construction on the edge of the opening.
2. The method for constructing the local hole of the unbonded prestressed tendon concrete slab as claimed in claim 1, wherein: the combined anchoring tool comprises an open type outer anchoring ring, a clamping type middle anchoring ring and an inner clamping piece, wherein the open type outer anchoring ring is a cylinder with a cylinder cavity and is locally opened at one side; the clamping type middle anchor ring is formed by combining two semi-cylindrical bearing sheets, and a truncated cone-shaped anchor hole is formed in the middle of the clamping type middle anchor ring; the inner clamping piece is formed by combining two semicircular platform body anchor pieces, and a cylindrical through hole is formed in the middle of the inner clamping piece; the inner clamping piece can be arranged in a circular truncated cone-shaped anchor hole of the clamping type middle anchor ring, and the clamping type middle anchor ring is arranged in a cylindrical cavity of the open type outer anchor ring.
3. The method for constructing the local hole of the unbonded prestressed tendon concrete slab as claimed in claim 1, wherein: the open type end plate is a common bearing plate or a connected bearing plate.
4. The method for constructing the local hole of the unbonded prestressed tendon concrete slab as claimed in claim 1, wherein: the hole-pouring concrete is common concrete or self-compacting concrete.
5. The method for constructing the local hole of the unbonded prestressed tendon concrete slab as claimed in claim 1, wherein: the plugging material is fine aggregate concrete or shrinkage-free mortar doped with an expanding agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911002317.8A CN110778139A (en) | 2019-10-21 | 2019-10-21 | Local hole-opening construction method for unbonded prestressed tendon concrete slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911002317.8A CN110778139A (en) | 2019-10-21 | 2019-10-21 | Local hole-opening construction method for unbonded prestressed tendon concrete slab |
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| Publication Number | Publication Date |
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| CN110778139A true CN110778139A (en) | 2020-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911002317.8A Pending CN110778139A (en) | 2019-10-21 | 2019-10-21 | Local hole-opening construction method for unbonded prestressed tendon concrete slab |
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| CN (1) | CN110778139A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360177A (en) * | 2020-09-30 | 2021-02-12 | 杭州圣基建筑特种工程有限公司 | Method for opening hole in beam slab of unbonded prestressed concrete structure |
| CN112681756A (en) * | 2020-12-29 | 2021-04-20 | 上海二十冶建设有限公司 | Simple plant pre-stress tensioning end fixing and mounting method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4574545A (en) * | 1984-03-30 | 1986-03-11 | Breivik-Reigstad, Inc. | Method for installing or replacing tendons in prestressed concrete slabs |
| CN1290798A (en) * | 2000-11-17 | 2001-04-11 | 胡伟 | Hole drilling technology for cohesionless prestressed concrete roof board |
| CN1603545A (en) * | 2004-10-29 | 2005-04-06 | 哈尔滨工业大学 | Anchor for caving built prestressed concrete floorslab |
| CN106968400A (en) * | 2017-05-23 | 2017-07-21 | 哈尔滨工业大学 | One kind removes unbonded prestressed concrete structure moveable anchor and its application method |
| EP3317471A1 (en) * | 2015-07-01 | 2018-05-09 | VSL International AG | Anchorage assembly for a structure, concrete structure with such an assembly, and manufacturing method of such a concrete structure |
-
2019
- 2019-10-21 CN CN201911002317.8A patent/CN110778139A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4574545A (en) * | 1984-03-30 | 1986-03-11 | Breivik-Reigstad, Inc. | Method for installing or replacing tendons in prestressed concrete slabs |
| CN1290798A (en) * | 2000-11-17 | 2001-04-11 | 胡伟 | Hole drilling technology for cohesionless prestressed concrete roof board |
| CN1603545A (en) * | 2004-10-29 | 2005-04-06 | 哈尔滨工业大学 | Anchor for caving built prestressed concrete floorslab |
| EP3317471A1 (en) * | 2015-07-01 | 2018-05-09 | VSL International AG | Anchorage assembly for a structure, concrete structure with such an assembly, and manufacturing method of such a concrete structure |
| CN106968400A (en) * | 2017-05-23 | 2017-07-21 | 哈尔滨工业大学 | One kind removes unbonded prestressed concrete structure moveable anchor and its application method |
Non-Patent Citations (1)
| Title |
|---|
| 周威等: "无粘结预应力混凝土楼盖封洞与开洞改造设计", 《工业建筑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360177A (en) * | 2020-09-30 | 2021-02-12 | 杭州圣基建筑特种工程有限公司 | Method for opening hole in beam slab of unbonded prestressed concrete structure |
| CN112681756A (en) * | 2020-12-29 | 2021-04-20 | 上海二十冶建设有限公司 | Simple plant pre-stress tensioning end fixing and mounting method |
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Application publication date: 20200211 |