CN112593720A - Shear wall replacement support system and application thereof - Google Patents
Shear wall replacement support system and application thereof Download PDFInfo
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- CN112593720A CN112593720A CN202010547411.8A CN202010547411A CN112593720A CN 112593720 A CN112593720 A CN 112593720A CN 202010547411 A CN202010547411 A CN 202010547411A CN 112593720 A CN112593720 A CN 112593720A
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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
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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
- E04G25/00—Shores or struts; Chocks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
The invention discloses a shear wall replacement support system and application thereof. The shear wall replacement support system comprises a plurality of support units, wherein each support unit comprises a pair of support subunits arranged on two sides of a shear wall to be replaced; the supporting subunit comprises a plurality of vertically connected supporting upright rods; the bottom end of the bottommost supporting vertical rod is fixed on the side wall of the shear wall of the next floor through a steel corbel, and the top end of the topmost supporting vertical rod is fixed on the side wall of the shear wall of the previous floor through a steel corbel; a jack is arranged between the topmost supporting upright rod and the steel bracket, and a pressure transmitter supporting plate is arranged between the jack and the steel bracket.
Description
Technical Field
The invention relates to a shear wall replacement support system and application thereof, and belongs to the technical field of reinforcement construction.
Background
The reinforced concrete structure has been widely researched and popularized in the last century, and a large number of concrete structure buildings are built worldwide. However, due to various reasons such as improper construction, severe environment, natural disasters, functional changes and aging of building materials, buildings need to be reinforced and modified.
High-rise buildings refer to houses with building height greater than 27 meters and non-single-storey plants, warehouses and other civil buildings with building height greater than 24 meters. A common urban high-rise residential building mostly adopts a shear wall structure, the shear wall is a main bearing structure in the building, and in the building engineering, the condition that the strength of concrete of the existing shear wall structure does not reach the standard or the bearing capacity is insufficient can be met, so that the structure needs to be reinforced. Commonly used reinforcing methods include a cross-section enlarging method, a steel plate adhering reinforcing method, a concrete replacement reinforcing method and the like. But the problems existing in different prior art are obvious that the method for enlarging the cross section can reduce the using space of the building; although the steel plate sticking reinforcing method is quick in construction, the capacity of joint work of the stuck steel plate and the original wall is poor, and the reinforcing effect is influenced.
Although the concrete replacement reinforcement method can fundamentally solve the problem of the shear wall, the support arrangement of the method has high requirements on the construction technology, and the construction of an upper structure is influenced in the replacement reinforcement construction process, so that the construction period, the construction quality and the engineering cost are influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a shear wall replacement support system.
The invention also provides a method for replacing the shear wall by using the support system.
The technical scheme of the invention is as follows:
a shear wall replacement support system comprises a plurality of support units, wherein each support unit comprises a pair of support subunits arranged on two sides of a shear wall to be replaced; the supporting subunit comprises a plurality of vertically connected supporting upright rods; the bottom end of the bottommost supporting vertical rod is fixed on the side wall of the shear wall of the next floor through a steel corbel, and the top end of the topmost supporting vertical rod is fixed on the side wall of the shear wall of the previous floor through a steel corbel; a jack is arranged between the topmost supporting upright rod and the steel bracket, and a pressure transmitter supporting plate is arranged between the jack and the steel bracket. The pressure transmitter supporting plate is used for fixing the pressure sensor.
Preferably, the steel bracket is provided with 4 bolts for fixing the supporting upright rod when supporting the bottom and fixing the pressure sensor base plate when the bracket is arranged on the top.
A method for replacing a shear wall by using the support system comprises the following steps:
1) system component checking
1.1) calculation of support Pole Strength
The judgment condition is as follows: sigma1＝(1－0.5·n1/n)·N/An≤f；
The net section area is An is A-sigma ki;
wherein N is the axial center pressure of the supporting vertical rod, A is the sectional area of the supporting vertical rod, sigma-kiFor the total area of all the holes on the supporting vertical rod, n is the number of the bolts at the end part of the supporting vertical rod, and n is the total area of all the holes on the supporting vertical rod1F is the steel strength for supporting the number of bolts on the section of the vertical rod.
1.2) judging conditions of the stability of the supporting vertical rod: sigma2＝N/(Ф·A)≤f；
Wherein phi is a stability coefficient of the support vertical rod;
2) and (3) joist construction:
the joist form is steel corbel adds supplementary steel joist, and the concrete construction method is:
2.1) positioning and paying off on site, and determining the fixed position of the steel corbel according to the total length of the supporting rod;
2.2) determining hole forming point positions on two sides of the wall body, and respectively drilling holes on two sides of the wall body; the diameter of the formed hole is 26 mm; the diameter of the formed hole is 26mm, so that the wall penetrating and forming hole is ensured to be vertical to the wall body, and the concrete of the wall body is prevented from being damaged.
2.3) installing steel brackets on two sides of the wall body in opposite directions at the same time, screwing nuts, and adopting double gaskets and double nuts on two sides;
3) mounting of support system
Support pole setting installation
3.1.1) connecting the bottommost supporting upright rod with the steel bracket supporting plate;
3.1.2) the supporting upright poles are connected through flanges;
3.1.3) rechecking the verticality of the supporting vertical rod, wherein the verticality deviation is not more than 3 per thousand;
mounting jack and pressure transmitter supporting plate
3.2.1) temporarily fixing the pressure sensor supporting plate on the steel bracket through a long screw;
3.2.2) fixing a pressure sensor on the pressure transmitter supporting plate;
3.2.3) adjusting the nut corresponding to the long screw to enable the pressure sensor supporting plate to be horizontal, and then fixing the long screw;
3.2.4) installing a jack, and pre-pressing to enable a jack shaft to be in contact with a pressure sensor on a pressure transmitter supporting plate;
3.2.5) installing the completed support subunits one by one;
applying pressure
3.3.1) after the supporting system is installed, firstly pressurizing each jack to 8% -12% of the value to be unloaded, then controlling the jacks to simultaneously pressurize step by step, pausing the inspection of the supporting system once when each 20% of the value to be unloaded is increased, controlling each jack to pressurize in a balanced manner through the pressure value fed back by the pressure sensor, wherein the deviation value of each jack is not more than 5%;
3.3.2) when the pressure is increased to 70 percent of the value to be unloaded, stopping and holding the pressure for two hours, checking whether the wall body and the beam crack or slide, if so, checking again, if normal and stable, continuously increasing the pressure until the numerical value of the jack is stabilized at the value to be unloaded, and then removing the oil pressure pump;
4) concrete removal
4.1, dismantling the wall in sections with the length of more than 1 meter, wherein the length of each section is not more than 50 cm;
4.2, stripping the concrete on the surface of the wall body until the concrete is removed to the inner side of the wall reinforcing steel bars, and removing the constraint of the reinforcing steel bars on the concrete;
4.3 forming holes on the side surface and the front surface of the residual concrete in the middle of the wall core, embedding static blasting expansion powder, and manually removing and cleaning broken slag after the expansion powder is finished;
4.4 when the wall body to be replaced is removed, extending and removing 50mm towards the non-replacement area or the replacement-completed area on the two sides; for the case where the junction is found to be not dense outside the replacement area: if the area is very small, the concrete layer is directly removed to be solid; if the concrete defect area is large, the concrete defect area is fed back to a design unit in time, and a treatment scheme is provided additionally.
The invention has the following beneficial effects:
the shear wall replacement support system provided by the invention is used for replacing the shear wall, so that the construction difficulty is reduced, the construction precision is high, the safety guarantee is improved, the production efficiency is high, the construction quality is improved, and the construction cost is reduced.
Drawings
FIG. 1 is a front view of a support subunit of the present invention in use;
FIG. 2 is a side view of the support subunit of the present invention in use;
FIG. 3 is a side view of the support pole in use with a steel corbel below the support pole;
FIG. 4 is a front view of a steel corbel below the support upright in use;
FIG. 5 is a top view of a steel corbel below the support upright in use;
FIG. 6 is a schematic illustration of a concrete rejection sequence;
the shear wall replacement device comprises a steel bracket 1, a steel corbel 2, a pressure transmitter supporting plate 3, a jack 4, a supporting upright rod 5, a shear wall to be replaced 6 and an M24 bolt.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in figures 1 to 5 of the drawings,
a shear wall replacement support system comprises a plurality of support units, wherein each support unit comprises a pair of support subunits arranged on two sides of a shear wall to be replaced; the supporting subunit comprises a plurality of vertically connected supporting upright rods 4; the bottom end of the bottommost supporting vertical rod 4 is fixed on the side wall of the shear wall of the next floor through the steel bracket 1, and the top end of the topmost supporting vertical rod 4 is fixed on the side wall of the shear wall of the previous floor through the steel bracket 1; a jack 3 is arranged between the topmost supporting upright rod 4 and the steel bracket 1, and a pressure transmitter supporting plate 2 is arranged between the jack 3 and the steel bracket 1. The pressure transmitter supporting plate 2 is used for fixing the pressure sensor. Be provided with 4 bolts on the steel bracket 1 for when being used for supporting the bottom, be used for the fixed stay pole setting 4, when the top was arranged in to the bracket, be used for fixed pressure sensor backing plate.
Example 2
A method of shear wall replacement using the support system of embodiment 1, comprising the steps of:
1) system component checking
1.1) calculation of support Pole Strength
The judgment condition is as follows: sigma1＝(1－0.5·n1/n)·N/An≤f；
The supporting upright rods in the embodiment are custom round tubes RH194X7.5 (cross-sectional area 4394.300);
the net section area is An is A-sigma ki;
＝4394.30-0.00＝4394.30mm2
σ1＝(1－0.5·n1/n)·N/An＝(1－0.5×0/8)×920000.00/4394.30
209.362N/mm2 ≦ f 215N/mm2, which satisfies the requirement! (namely the ultimate vertical bearing capacity of the type of supporting upright stanchion is 920KN & gt 407.23 KN);
wherein N is the axial center pressure of the supporting vertical rod, A is the sectional area of the supporting vertical rod, sigma-kiIn order to support the total area of all the openings in the uprights,n is the number of bolts supporting the end of the vertical rod, n1The number of the bolts on the cross section of the supporting vertical rod is f, and the strength of the steel for supporting the vertical rod is f.
1.2) judging conditions of the stability of the supporting vertical rod: sigma2＝N/(Ф·A)≤f；
σ2＝N/(Ф·A)
＝800*10^3/(0.91×4394.3)
＝200.1N/mm2≤f＝215N/mm2Satisfy the requirement! (namely the pole bearing capacity of the model supporting upright pole for ensuring stability is 800KN & gt 407.23KN)
Wherein Φ is a stability coefficient of the support vertical rod, and in this embodiment, Φ is obtained by looking up a table as 0.91;
2) and (3) joist construction:
the joist form is steel corbel adds supplementary steel joist, and the concrete construction method is:
2.1) positioning and paying off on site, and determining the fixed position of the steel corbel 1 according to the total length of the supporting rod 4;
2.2) determining hole forming point positions on two sides of the wall by adopting a magnetic induction wall detector, and respectively drilling holes on two sides of the wall; the diameter of the formed hole is 26 mm; the diameter of the formed hole is 26mm, so that the wall penetrating and forming hole is ensured to be vertical to the wall body, and the concrete of the wall body is prevented from being damaged.
2.3) simultaneously mounting steel brackets 1 on two sides of the wall body in opposite directions, screwing nuts, and adopting double gaskets and double nuts on two sides;
3) mounting of support system
Support pole setting installation
3.1.1) matching four M24 bolts with 4 reserved bolt holes on the steel bracket; connecting the bottommost supporting upright rod 4 with a steel bracket supporting plate;
3.1.2) the supporting upright stanchions 4 are connected through flanges;
3.1.3) adopting a theodolite to recheck the verticality of the supporting upright stanchion 4, wherein the verticality deviation is not more than 3 per thousand;
mounting jack and pressure transmitter supporting plate
3.2.1) temporarily fixing the pressure sensor supporting plate 2 on the steel bracket through 4M 24 long screws;
3.2.2) fixing a pressure sensor on the pressure transmitter supporting plate 2; fixing the pressure sensor by 4M16 screws through 4 bolt holes reserved on a pressure transmitter supporting plate;
3.2.3) adjusting the nuts corresponding to the long screws to enable the pressure sensor supporting plate 2 to be horizontal, and then fixing 4 long screws;
3.2.4) installing a jack, and pre-pressing to enable a jack shaft to be in contact with a pressure sensor on the pressure transmitter supporting plate 2;
3.2.5) installing the remaining 4 long screws; installing the supporting subunits one by one;
applying pressure
3.3.1) after the supporting system is installed, firstly pressurizing each jack 3 to 10% of the value to be unloaded, then controlling the jacks 3 to pressurize step by step at the same time, pausing the inspection of the supporting system once when each 20% of the value to be unloaded is increased, controlling each jack 3 to pressurize in a balanced manner through the pressure value fed back by the pressure sensor, and enabling the deviation value of each jack 3 not to exceed 5%;
3.3.2) when the pressure is increased to 70 percent of the value to be unloaded, stopping and holding the pressure for two hours, checking whether the wall body and the beam crack or slide, if so, checking again, if normal and stable, continuously increasing the pressure until the numerical value of the jack is stabilized at the value to be unloaded, and then removing the oil pressure pump;
4) concrete removal
4.1, dismantling the wall in sections with the length of more than 1 meter, wherein the length of each section is not more than 50 cm; as in the removal sequence of fig. 6:
4.2, stripping the concrete on the surface of the wall body until the concrete is removed to the inner side of the wall reinforcing steel bars, and removing the constraint of the reinforcing steel bars on the concrete;
4.3 forming holes on the side surface and the front surface of the residual concrete in the middle of the wall core, embedding static blasting expansion powder, and manually removing and cleaning broken slag after the expansion powder is finished;
4.4 when the wall body to be replaced is removed, extending and removing 50mm towards the non-replacement area or the replacement-completed area on the two sides; for the case where the junction is found to be not dense outside the replacement area: if the area is very small, the concrete layer is directly removed to be solid; if the concrete defect area is large, the concrete defect area is fed back to a design unit in time, and a treatment scheme is provided additionally.
In this embodiment, the wall bolts are double-nut hole expanding bolts _8.8 grade-M24, and the arrangement form of the wall bolts is annular: 4 rows; the line spacing is 217 mm; 3 columns; the row spacing is 125 mm; selecting an anchor plate: SB16_ Q235, anchor plate size: the length L × width B is 400mm × 800mm, and the thickness T is 16.
Claims (3)
1. A shear wall replacement support system is characterized by comprising a plurality of support units, wherein each support unit comprises a pair of support subunits arranged at two sides of a shear wall to be replaced; the supporting subunit comprises a plurality of vertically connected supporting upright rods; the bottom end of the bottommost supporting vertical rod is fixed on the side wall of the shear wall of the next floor through a steel corbel, and the top end of the topmost supporting vertical rod is fixed on the side wall of the shear wall of the previous floor through a steel corbel; a jack is arranged between the topmost supporting upright rod and the steel bracket, and a pressure transmitter supporting plate is arranged between the jack and the steel bracket.
2. The shear wall replacement support system of claim 1, wherein the steel corbel has 4 bolts provided thereon for securing a support upright when used to support the bottom and a pressure sensor pad when the corbel is placed on top.
3. A method of shear wall replacement using the support system of claim 1 or 2, comprising the steps of:
1) system component checking
1.1) calculation of support Pole Strength
The judgment condition is as follows: sigma1＝(1－0.5·n1/n)·N/An≤f；
The net section area is An is A-sigma ki;
wherein N is the axial center pressure of the supporting vertical rod, A is the sectional area of the supporting vertical rod, sigma-kiFor the total area of all the openings on the supporting vertical rod, n is the screw at the end of the supporting vertical rodNumber of pins, n1The number of bolts on the cross section of the supporting upright rod is shown, and f is the strength of steel;
1.2) judging conditions of the stability of the supporting vertical rod: sigma2＝N/(Ф·A)≤f；
Wherein phi is a stability coefficient of the support vertical rod;
2) and (3) joist construction:
the joist form is steel corbel adds supplementary steel joist, and the concrete construction method is:
2.1) positioning and paying off on site, and determining the fixed position of the steel corbel according to the total length of the supporting rod;
2.2) determining hole forming point positions on two sides of the wall body, and respectively drilling holes on two sides of the wall body; the diameter of the formed hole is 26 mm;
2.3) installing steel brackets on two sides of the wall body in opposite directions at the same time, screwing nuts, and adopting double gaskets and double nuts on two sides;
3) mounting of support system
Support pole setting installation
3.1.1) connecting the bottommost supporting upright rod with the steel bracket supporting plate;
3.1.2) the supporting upright poles are connected through flanges;
3.1.3) rechecking the verticality of the supporting vertical rod, wherein the verticality deviation is not more than 3 per thousand;
mounting jack and pressure transmitter supporting plate
3.2.1) temporarily fixing the pressure sensor supporting plate on the steel bracket through a long screw;
3.2.2) fixing a pressure sensor on the pressure transmitter supporting plate;
3.2.3) adjusting the nut corresponding to the long screw to enable the pressure sensor supporting plate to be horizontal, and then fixing the long screw;
3.2.4) installing a jack, and pre-pressing to enable a jack shaft to be in contact with a pressure sensor on a pressure transmitter supporting plate;
3.2.5) installing the completed support subunits one by one;
applying pressure
3.3.1) after the supporting system is installed, firstly pressurizing each jack to 8% -12% of the value to be unloaded, then controlling the jacks to simultaneously pressurize step by step, pausing the inspection of the supporting system once when each 20% of the value to be unloaded is increased, controlling each jack to pressurize in a balanced manner through the pressure value fed back by the pressure sensor, wherein the deviation value of each jack is not more than 5%;
3.3.2) when the pressure is increased to 70 percent of the value to be unloaded, stopping and holding the pressure for two hours, checking whether the wall body and the beam crack or slide, if so, checking again, if normal and stable, continuously increasing the pressure until the numerical value of the jack is stabilized at the value to be unloaded, and then removing the oil pressure pump;
4) concrete removal
4.1, dismantling the wall in sections with the length of more than 1 meter, wherein the length of each section is not more than 50 cm;
4.2, stripping the concrete on the surface of the wall body until the concrete is removed to the inner side of the wall reinforcing steel bars, and removing the constraint of the reinforcing steel bars on the concrete;
4.3 forming holes on the side surface and the front surface of the residual concrete in the middle of the wall core, embedding static blasting expansion powder, and manually removing and cleaning broken slag after the expansion powder is finished;
4.4 when the wall body to be replaced is removed, extending and removing 50mm towards the non-replacement area or the replacement-completed area on the two sides; for the case where the junction is found to be not dense outside the replacement area: if the area is very small, the concrete layer is directly removed to be solid; if the concrete defect area is large, the concrete defect area is fed back to a design unit in time, and a treatment scheme is provided additionally.
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| CN202010547411.8A CN112593720A (en) | 2020-06-16 | 2020-06-16 | Shear wall replacement support system and application thereof |
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| CN202010547411.8A CN112593720A (en) | 2020-06-16 | 2020-06-16 | Shear wall replacement support system and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113323446A (en) * | 2021-04-23 | 2021-08-31 | 江苏省苏科建设技术发展有限公司 | Building construction supporting device, monitoring system and dismounting method |
| CN113982303A (en) * | 2021-10-22 | 2022-01-28 | 广东中青建筑科技有限公司 | Replacement method of reinforced concrete column |
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Cited By (3)
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| CN113982303A (en) * | 2021-10-22 | 2022-01-28 | 广东中青建筑科技有限公司 | Replacement method of reinforced concrete column |
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Application publication date: 20210402 |