CN114319928A - Existing concrete structure column pulling method based on external prestress reinforcement technology - Google Patents
Existing concrete structure column pulling method based on external prestress reinforcement technology Download PDFInfo
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- CN114319928A CN114319928A CN202210137723.0A CN202210137723A CN114319928A CN 114319928 A CN114319928 A CN 114319928A CN 202210137723 A CN202210137723 A CN 202210137723A CN 114319928 A CN114319928 A CN 114319928A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000002787 reinforcement Effects 0.000 title claims abstract description 25
- 238000005516 engineering process Methods 0.000 title claims abstract description 16
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 210000002435 tendon Anatomy 0.000 claims description 77
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 238000005520 cutting process Methods 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 5
- 238000004873 anchoring Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005253 cladding Methods 0.000 description 3
- 238000003359 percent control normalization Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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Abstract
The invention discloses an existing concrete structure column pulling method based on an external prestress reinforcement technology, which comprises the following steps: s1, determining a column member to be disassembled in the existing concrete structure; s2, making a reinforcing scheme and manufacturing a reinforcing part; s3, reinforcing an adjacent side structure of the column member to be disassembled by using a reinforcing part, wherein the adjacent side structure comprises a concrete beam to be reinforced in the horizontal direction and a concrete beam to be reinforced in the vertical direction, the top of the column member to be disassembled is fixed on the concrete beam to be reinforced in the horizontal direction, and the concrete beams to be reinforced in the vertical direction are positioned on the left side and the right side of the column member to be disassembled; and S4, removing the column member to be disassembled after the reinforcement is completed. The invention can effectively solve the rigidity problem of the reinforcing beam, meet the requirement of the bearing capacity limit state, and simultaneously can realize the dismantling of the column member under the transverse non-secondary beam prestressed reinforcing beam, thereby improving the construction efficiency of the external prestressed reinforcing engineering.
Description
Technical Field
The invention relates to the technical field of house reconstruction and reinforcement, in particular to a method for pulling out a column of an existing concrete structure based on an external prestress reinforcement technology.
Background
Concrete structures are widely used in the construction of infrastructures such as industrial and civil buildings, road bridges, harbor wharfs, etc. due to their various advantages. With the rapid development of economy in China, the form of buildings is changing day by day, and the space requirements of users on the buildings are higher and higher. At present, a large number of frame structure buildings with smaller column net sizes cannot meet the pursuit of users on large space, high permeability and flexible layout, and a lot of owners put forward the pursuit of pulling out columns in conference rooms, activity rooms and large-area offices. Therefore, an economical and reasonable joist column pulling transformation technology is developed, the method can effectively improve the use space of the building, has small influence on normal production and life, and has wide use value in the transformation of old buildings.
The external prestress reinforcement can well meet the requirements of deformation, bearing capacity, rigidity and the like of the structure before and after column pulling by combining various existing reinforcement methods. In the prior patent, the invention with the patent number ZL201910640469.4 discloses a method for reinforcing external prestress of a support removing column, which adopts a mode that single-fold line external prestress tendons are reinforced along the length direction of a floor slab to ensure the stress balance of a beam body and the floor slab, but the adopted method for reinforcing the prestress tendons only reinforces the structure in one direction.
Disclosure of Invention
In view of the above, it is necessary to provide a method for pulling out a column of an existing concrete structure based on an external prestressing reinforcement technology, which has high rigidity and high operation efficiency.
An existing concrete structure column pulling method based on an external prestress reinforcement technology comprises the following steps:
s1, determining a column member to be disassembled in the existing concrete structure;
s2, making a reinforcing scheme and manufacturing a reinforcing part;
s3, reinforcing an adjacent side structure of the column member to be disassembled by using a reinforcing part, wherein the adjacent side structure comprises a concrete beam to be reinforced in the horizontal direction and a concrete beam to be reinforced in the vertical direction, the top of the column member to be disassembled is fixed on the concrete beam to be reinforced in the horizontal direction, and the concrete beams to be reinforced in the vertical direction are positioned on the left side and the right side of the column member to be disassembled;
and S4, removing the column member to be disassembled after the reinforcement is completed.
In one embodiment, in step S2, the reinforcing parts include prestressed tendons, tension beams and turning blocks, and after the reinforcing parts are manufactured, the reinforcing parts are classified and numbered and sent to the site, and the prestressed tendons include transverse prestressed tendons and longitudinal prestressed tendons.
In one embodiment, the step S3 includes:
s31, fixedly arranging the steering blocks on the horizontal concrete beam to be reinforced, wherein the steering blocks are positioned on the left side and the right side of the column member to be disassembled, and the two steering blocks keep the same direction;
s32, fixedly installing the tensioning cross beam on the concrete beam to be reinforced in the vertical direction at two sides, and enabling the tensioning surface of the tensioning cross beam to be perpendicular to the transverse prestressed tendons;
s33, installing transverse prestressed tendons and tensioning, wherein the transverse prestressed tendons are distributed on the front side and the rear side of the concrete beam to be reinforced in the horizontal direction;
and S34, installing longitudinal prestressed tendons and tensioning the longitudinal prestressed tendons, wherein the longitudinal prestressed tendons are distributed on the front side and the rear side of the column member to be disassembled.
In one embodiment, the step S33 includes:
s331, locking one end of a transverse prestressed tendon on a tensioning cross beam on one side through an anchorage device, penetrating the other end of the transverse prestressed tendon from an anchorage device hole on one end of a steering block, transferring the transverse prestressed tendon to the other end of the steering block in a manual relay mode, penetrating the transverse prestressed tendon from an anchorage device hole on the other end of the steering block, and locking the transverse prestressed tendon on the tensioning cross beam on the other side through the anchorage device after the transverse prestressed tendon is straightened manually;
s332, calibrating equipment before tensioning the transverse prestressed tendons;
s333, tensioning the transverse prestressed tendons, wherein the tensioning method comprises the following operations in sequence: 0. initial stress, 20 percent control stress, 100 percent control stress, one end of the steel pipe is anchored, the other end of the steel pipe is anchored after tension force is complemented, and the two ends of the steel pipe are unloaded simultaneously;
and S334, cutting the redundant transverse prestressed tendons in the working length after tensioning is finished.
In one embodiment, in step S334, the cutting is performed by using a portable cutter, and the length of the transverse tendon exposed outside the anchor is not less than 30 mm.
In one embodiment, the prestressed beam is made of a steel strand, and an anti-corrosion isolation layer and a PE outer protection pipe are sequentially arranged on the steel strand from inside to outside.
The method for pulling the existing concrete structure based on the external prestress reinforcement technology can effectively solve the problem of rigidity of the reinforcing beam for the existing concrete structure with large span change and unchanged beam section after pulling the column, meets the requirement of a bearing capacity limit state, can realize the dismantling of column members under the prestress reinforcing beam without transverse secondary beams, and improves the construction efficiency of external prestress reinforcement engineering.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of an existing concrete of the present invention;
FIG. 2 is a schematic structural view of existing concrete after the column pulling reinforcement of the present invention;
FIG. 3 is a schematic diagram illustrating the distribution structure of the tendon according to the present invention;
FIG. 4 is a state of use diagram of a first angle of the steering block of the present invention;
FIG. 5 is a second angle use condition diagram of the steering block of the present invention;
FIG. 6 is a first angle in use view of the tension beam of the present invention;
fig. 7 is a second angle usage diagram of the tension beam of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 7, an embodiment of the present invention provides a method for pulling a column from an existing concrete structure based on an external prestressing reinforcement technology, including:
s1, determining the column member 5 to be disassembled in the existing concrete structure 1;
s2, making a reinforcing scheme and manufacturing a reinforcing part;
s3, reinforcing the adjacent side structure 2 of the column member 5 to be disassembled by adopting a reinforcing part, wherein the adjacent side structure 2 comprises a horizontal concrete beam 8 to be reinforced and a vertical concrete beam 9 to be reinforced, the top of the column member 5 to be disassembled is fixed on the horizontal concrete beam 8 to be reinforced, and the vertical concrete beam 9 to be reinforced is positioned at the left side and the right side of the column member 5 to be disassembled;
and S4, after the reinforcement is completed, removing the column member 5 to be disassembled.
The method for pulling the existing concrete structure based on the external prestress reinforcement technology can effectively solve the problem of rigidity of the reinforcing beam for the existing concrete structure with large span change and unchanged beam section after pulling the column, meets the requirement of a bearing capacity limit state, can realize the dismantling of column members under the prestress reinforcing beam without transverse secondary beams, and improves the construction efficiency of external prestress reinforcement engineering.
In an embodiment of the present invention, in the step S2, the reinforcing parts include prestressed tendons, a tension beam 6 and a turning block 7, and after the manufacturing of the reinforcing parts is completed, the reinforcing parts are classified and numbered and sent to the site, and the prestressed tendons include transverse prestressed tendons 3 and longitudinal prestressed tendons 4.
In the embodiment, the tensioning cross beam 6 and the steering block 7 are preferably made of steel materials with strength greater than or equal to Q235, and the semicircular steel forming the steering block 7 is ensured to have sufficient rigidity and strength so as to meet the requirement of resisting the radial force generated by the transverse prestressed tendons 3 in the tensioning process; meanwhile, the tensioning cross beam 6 and the steering block 7 are provided with reserved holes, so that expansion bolts can be conveniently adopted to realize reliable connection with the existing concrete structure 1.
In an embodiment of the present invention, the step S3 includes:
s31, fixedly arranging the steering blocks 7 on the horizontal concrete beam 8 to be reinforced, and positioning the steering blocks 7 at the left side and the right side of the column member 5 to be disassembled, wherein the two steering blocks 7 keep the same direction;
s32, fixedly installing the tension beam 6 on the vertical concrete beam 9 to be reinforced on two sides, and enabling the tension surface of the tension beam 6 to be perpendicular to the transverse prestressed tendons 3; in this embodiment, the tension beam 6 needs to be adjusted according to the arrangement of the transverse prestressed tendons 3, so that it is ensured that the tension surface is perpendicular to the transverse prestressed tendons 3, and the phenomenon that the tension beam 6 is broken in the tension process should not occur.
S33, installing and tensioning transverse prestressed tendons 3, wherein the transverse prestressed tendons 3 are distributed on the front side and the rear side of the horizontal concrete beam 8 to be reinforced;
and S34, installing and tensioning longitudinal prestressed tendons 4, wherein the longitudinal prestressed tendons 4 are distributed on the front side and the rear side of the column member 5 to be disassembled.
In an embodiment of the present invention, the step S33 includes:
s331, locking one end of a transverse prestressed tendon 3 on a tensioning cross beam 6 on one side through an anchorage device, penetrating the other end of the transverse prestressed tendon 3 into an anchoring part hole at one end of a steering block 7, transferring the transverse prestressed tendon 3 to the other end of the steering block 7 in a manual relay mode, penetrating out of an anchoring part hole at the other end of the steering block 7, and finally, manually straightening the transverse prestressed tendon 3 and locking the transverse prestressed tendon on the tensioning cross beam 6 on the other side through the anchorage device; in this embodiment, the reserved stretching working length of the transverse prestressed tendon 3 outside the anchorage is not less than 700 mm. When the transverse prestressed tendon 3 is penetrated, attention should be paid to the protection of the transverse prestressed tendon 3, especially when penetrating through the inner hole of the anchoring part, in order to prevent the hole wall from damaging the outer cladding of the transverse prestressed tendon 3, the outer cladding of the transverse prestressed tendon 3 should be slightly out and slightly in, and the outer cladding of the transverse prestressed tendon 3 should be damaged and timely replaced.
S332, calibrating equipment before tensioning the transverse prestressed tendon 3; specifically, the jack and the oil pump are calibrated in a matched manner by using a hydraulic pressure testing machine with an error less than 1%. Recalibration should occur when: a. the oil pressure gauge does not return to zero or is damaged or fails; b. severe breaking and slipping; c. elongation is undesirable and tension is suspected; d. after the jack leaks oil seriously or is repaired; e. the jack tensioning equipment is calibrated by a Shanghai building engineering detection center, and the service life is 6 months. In addition, the transverse prestressed tendon 3 is tensioned by simultaneously tensioning two prestressed tendons in the reinforcing beam, three pairs of pore channels, anchor rings and jacks are required to be realized during tensioning, and the tensioning process is uniform.
S333, tensioning the transverse prestressed tendon 3, wherein the tensioning method comprises the following operations in sequence: 0. initial stress, 20 percent control stress, 100 percent control stress, one end of the steel pipe is anchored, the other end of the steel pipe is anchored after tension force is complemented, and the two ends of the steel pipe are unloaded simultaneously; specifically, 0 → initial stress (10% control stress, measured elongation value) → 20% control stress (measured elongation value) → 100% control stress (measured elongation value, holding load for two minutes) → one-end anchoring → the other-end anchoring after supplementing tensile force → both-end unloading at the same time; and when the tension reaches the corresponding meter reading, the corresponding control stress is reached.
It should be noted that, in the present invention, the actual elongation Δ L of the transverse prestressed tendon 3 satisfies the following formula:
△L＝△L1+△L2－△Lc
in the formula: Δ L1 — measured elongation from initial stress to maximum tensile force;
DeltaL 2-the estimated elongation value below the initial stress, which can be obtained from the difference between the measured elongation values of the initial stress and the double initial stress;
deltalc is the elastic compression value of the concrete member in the tensioning process.
The initial stress was taken to be 10% of the tensile control stress. By checking the tension elongation value, whether the tension force is enough, whether the friction loss of the pore passage is larger and whether the prestressed tendon is abnormal can be comprehensively reflected. During tensioning, the deviation between the measured elongation value and the theoretically calculated elongation value is required to be within the range of (-6 to + 6)%, and when the deviation exceeds the range, tensioning is immediately stopped, the reason is found out, and the operation is continued after corresponding measures are taken.
And S334, after tensioning is finished, cutting the redundant transverse prestressed tendons 3 in the working length.
In an embodiment of the present invention, in the step S334, the cutting is performed by using a portable cutting machine, and the length of the transverse tendon 3 exposed outside the anchor is not less than 30 mm. In this embodiment, the anchorage device and the transverse prestressed tendons 3 are subjected to sealing or fully-enclosed protection treatment according to the requirements of unbonded prestressed construction specifications.
In an embodiment of the invention, the prestressed beam is made of a steel strand, and an anti-corrosion isolation layer and a PE outer protection pipe are sequentially arranged on the steel strand from inside to outside. Therefore, the prestressed tendon has good corrosion resistance and corrosion resistance, and preferably, the steel strand adopts a high-strength low-relaxation steel strand with a tensile strength standard value fptk of 1860 MPa.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples are only illustrative of several embodiments of the present invention, but should not be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. An existing concrete structure column pulling method based on an external prestress reinforcement technology is characterized by comprising the following steps:
s1, determining a column member to be disassembled in the existing concrete structure;
s2, making a reinforcing scheme and manufacturing a reinforcing part;
s3, reinforcing an adjacent side structure of the column member to be disassembled by using a reinforcing part, wherein the adjacent side structure comprises a concrete beam to be reinforced in the horizontal direction and a concrete beam to be reinforced in the vertical direction, the top of the column member to be disassembled is fixed on the concrete beam to be reinforced in the horizontal direction, and the concrete beams to be reinforced in the vertical direction are positioned on the left side and the right side of the column member to be disassembled;
and S4, removing the column member to be disassembled after the reinforcement is completed.
2. The method for pulling out a column of an existing concrete structure based on the external prestressing reinforcement technology of claim 1, wherein in the step S2, the reinforcing members comprise tendons, tension beams and turning blocks, and after the reinforcing members are manufactured, the reinforcing members are classified and numbered and sent to the site, and the tendons comprise transverse tendons and longitudinal tendons.
3. The method for pulling out a column of an existing concrete structure based on the external prestressing reinforcement technology of claim 2, wherein the step S3 comprises:
s31, fixedly arranging the steering blocks on the horizontal concrete beam to be reinforced, wherein the steering blocks are positioned on the left side and the right side of the column member to be disassembled, and the two steering blocks keep the same direction;
s32, fixedly installing the tensioning cross beam on the concrete beam to be reinforced in the vertical direction at two sides, and enabling the tensioning surface of the tensioning cross beam to be perpendicular to the transverse prestressed tendons;
s33, installing transverse prestressed tendons and tensioning, wherein the transverse prestressed tendons are distributed on the front side and the rear side of the concrete beam to be reinforced in the horizontal direction;
and S34, installing longitudinal prestressed tendons and tensioning the longitudinal prestressed tendons, wherein the longitudinal prestressed tendons are distributed on the front side and the rear side of the column member to be disassembled.
4. The existing concrete structure column pulling method based on the external prestress reinforcement technology as claimed in claim 3, wherein the step S33 comprises:
s331, locking one end of a transverse prestressed tendon on a tensioning cross beam on one side through an anchorage device, penetrating the other end of the transverse prestressed tendon from an anchorage device hole on one end of a steering block, transferring the transverse prestressed tendon to the other end of the steering block in a manual relay mode, penetrating the transverse prestressed tendon from an anchorage device hole on the other end of the steering block, and locking the transverse prestressed tendon on the tensioning cross beam on the other side through the anchorage device after the transverse prestressed tendon is straightened manually;
s332, calibrating equipment before tensioning the transverse prestressed tendons;
s333, tensioning the transverse prestressed tendons, wherein the tensioning method comprises the following operations in sequence: 0. initial stress, 20 percent control stress, 100 percent control stress, one end of the steel pipe is anchored, the other end of the steel pipe is anchored after tension force is complemented, and the two ends of the steel pipe are unloaded simultaneously;
and S334, cutting the redundant transverse prestressed tendons in the working length after tensioning is finished.
5. The method for pulling out a column of an existing concrete structure based on the external prestressing reinforcement technology of claim 4, wherein in the step S334, the cutting is performed by a hand-held cutting machine, and the length of the transverse prestressing tendons exposed out of the anchorage device is not less than 30 mm.
6. The method for pulling out a column of an existing concrete structure based on the external prestress reinforcement technology of claim 2, wherein the prestress tendons are made of steel strands, and the steel strands are sequentially provided with an anti-corrosion isolation layer and a PE outer protection pipe from inside to outside.
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| CN202210137723.0A CN114319928A (en) | 2022-02-15 | 2022-02-15 | Existing concrete structure column pulling method based on external prestress reinforcement technology |
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| CN202210137723.0A CN114319928A (en) | 2022-02-15 | 2022-02-15 | Existing concrete structure column pulling method based on external prestress reinforcement technology |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1434062A1 (en) * | 1985-08-07 | 1988-10-30 | Волгоградский инженерно-строительный институт | Arrangement for reinforcing operated reinforced concrete beam |
| CN201460238U (en) * | 2009-07-03 | 2010-05-12 | 同济大学 | Steering block |
| CN105155868A (en) * | 2015-09-16 | 2015-12-16 | 项剑锋 | Method for pulling pillar through prestress using non-binding steel strands |
| CN209145324U (en) * | 2018-11-22 | 2019-07-23 | 山东省建筑科学研究院 | It is a kind of with the big across Bars In Poured Concrete Slab of external prestressing strengthening structure |
-
2022
- 2022-02-15 CN CN202210137723.0A patent/CN114319928A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1434062A1 (en) * | 1985-08-07 | 1988-10-30 | Волгоградский инженерно-строительный институт | Arrangement for reinforcing operated reinforced concrete beam |
| CN201460238U (en) * | 2009-07-03 | 2010-05-12 | 同济大学 | Steering block |
| CN105155868A (en) * | 2015-09-16 | 2015-12-16 | 项剑锋 | Method for pulling pillar through prestress using non-binding steel strands |
| CN209145324U (en) * | 2018-11-22 | 2019-07-23 | 山东省建筑科学研究院 | It is a kind of with the big across Bars In Poured Concrete Slab of external prestressing strengthening structure |
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Application publication date: 20220412 |