CN118582085A - A correction and reinforcement system for old buildings with eccentric high loads - Google Patents

Abstract

The invention relates to the technical field of construction measures for the existing building, and discloses a correction and reinforcement system for an old building with eccentric high-position load, wherein the eccentric influence of a landing eccentric part on the old building is eliminated by adding a self-sustaining eccentric part, the eccentric influence of a ground eccentric part on the old building is eliminated by assisting a correction core tube and a position supplementing core tube, the self-sustaining eccentric part is changed into the same face after being removed, but the eccentric is not caused, and meanwhile, the original building is greatly reserved; the off-ground eccentric part which cannot be removed on the premise of not damaging the stress component of the old building is treated by adopting a mode of newly constructing a correction core tube at a central symmetry position, and a compensation core tube is arranged to compensate the damage of the correction core tube to the appearance of the building, so that the building is kept square, the correction core tube and the compensation core tube enlarge the area of the old building and obviously improve the horizontal bearing capacity of the old building, and the purpose of correction and reinforcement can be achieved by matching with a small amount of anti-seismic shear walls.

Description

A correction and reinforcement system for old buildings with eccentric high loads

Technical Field

The invention relates to the technical field of construction measures for existing buildings, in particular to a deviation correction and reinforcement system for old buildings with eccentric high-position loads.

Background Art

The fate of most old buildings is to be demolished to make way for the construction of new buildings, but there are some old buildings with special significance that need to be changed in use while retaining their original appearance, which requires in-depth renovation of the buildings.

Considering that the old building itself has been seriously aged, its structural strength has seriously declined, and its appearance has become very dilapidated. These problems are difficult to solve without deep transformation of the building itself. Therefore, the transformation of old buildings often needs to be carried out in the form of dismantling into parts and reassembling. During the dismantling process, the building parts can be tested separately and the parts that do not meet the strength standards or are seriously damaged can be replaced. The internal reinforcement treatment can be carried out or the internal layout of the building can be changed to adapt to the changes in the building's use.

However, this demolition and modification method is not applicable to some eccentric and slender old buildings. The biggest problem is that the consideration of stress in the construction of such buildings was not as perfect as it is now. They are slender, have serious torsional irregularities, and no effective measures have been taken to overcome this problem. Even in a brand new state, they are still illegal buildings according to existing standards. Over time, their stress problems have become more and more serious. The demolition and modification of such buildings cannot involve the demolition of load-bearing components (otherwise the building is likely to collapse during the demolition and modification process), and it is necessary to correct the stress problems that existed at the beginning.

Take the Jinyu Xingfa Science Park project in the northern area of Beijing Huairou Science City as an example. The project site is the Xingfa Cement Factory, which was built in the early 1990s and contributed a large amount of building materials to Beijing's urban construction. It is an important industrial heritage site. Therefore, the buildings there need to be transformed into scientific research facilities for use by nearby universities and research institutes while retaining their appearance. The kiln tail tower is the tallest building in the factory and needs to be transformed into an experimental building later. The building is a tower without a podium, and there is a heavy kiln tail flue gas treatment facility and a brick elevator shaft (which cannot be self-sustaining and will collapse after leaving the building) at the high side. The seismic performance of the building is seriously substandard. Fortunately, there have been no significant earthquakes in the Beijing area in recent decades, otherwise the building would have collapsed in an earthquake.

In addition to the above issues, it is also necessary to consider how to construct in "slender" old buildings during the renovation process, including the placement of materials and the transportation of waste materials. Improper handling will seriously affect construction efficiency.

Summary of the invention

The invention provides a deviation-correcting and reinforcing system for old buildings with eccentric high-position loads.

The technical problem to be solved is: some eccentric and slender old buildings did not fully consider the stress during their construction, and are considered illegal buildings according to existing standards. The demolition and reconstruction of such buildings should not involve the demolition of load-bearing components, but should also correct the stress problems that existed at the beginning. It is also necessary to use the space of the slender old buildings to facilitate their actual use in the later stage and improve the work efficiency of the construction of slender old buildings.

In order to solve the above technical problems, the present invention adopts the following technical solutions: a correction and reinforcement system for old buildings with eccentric high-position loads, the old building comprises a foundation, a frame column arranged on the top of the foundation, an outer wall connected to adjacent frame columns, an eccentric member above the ground fixed to the outer surface of any outer wall, the outer wall is an eccentric outer wall, and a ground-standing eccentric member abutting against the eccentric outer wall, any position of the eccentric member above the ground does not contact the ground, the ground-standing eccentric member is arranged vertically along the outer wall, and the bottom of the ground-standing eccentric member contacts the ground;

It is characterized in that a self-supporting imitation eccentric piece is arranged along the outer contour of the ground eccentric piece, the self-supporting imitation eccentric piece is provided with a correction core tube at a central symmetrical position of the old building, a supplementary core tube is arranged at an angle between the correction core tube and the self-supporting imitation eccentric piece away from the eccentric outer wall, the correction core tube and the supplementary core tube are both traffic cores, an external building is arranged at intervals on one side of the old building away from the eccentric outer wall, and a corridor is arranged between the correction core tube and the supplementary core tube to extend toward the external building at the interval position between the correction core tube and the supplementary core tube, so as to connect the external building with the old building;

The old building, the deviation-correcting core tube and the supplementary core tube are assembled into a rectangle in the horizontal plane, and the steel beam grids in the deviation-correcting core tube and the reinforcement core tube penetrate the old building and extend into the old building;

A new concrete structure is poured on the outside of the foundation to support the old building, the self-supporting imitation eccentric member, the deviation-correcting core tube and the replacement core tube at the same time;

A plurality of frame columns are provided with earthquake-resistant shear walls in a direction parallel to the outer wall. The earthquake-resistant shear walls are fixedly connected to adjacent frame columns and are attached to the outer wall.

Furthermore, the old building is a rectangular cylindrical structure, the off-ground eccentric piece is a metal component, the off-ground eccentric piece contacts the eccentric outer wall, the ground-mounted eccentric piece is an old elevator shaft, the height of the ground-mounted eccentric piece is consistent with the height of the old building, and a passage is provided between the correction core tube and the replacement core tube in the plane of the old building, the passage is connected to the corridor as a straight passage, and the external building is cylindrical.

Furthermore, the old building is a multi-story building, and each floor of the multi-story building is provided with a floor slab, and the steel beam grid under the floor slab is fixedly connected to the deviation-correcting core tube and the position core tube.

Furthermore, the cross section of the self-supporting pseudo-eccentric piece on the side close to the ground-lifting eccentric piece is larger than the cross section of the ground-lifting eccentric piece, and the ground-lifting eccentric piece is embedded in the self-supporting pseudo-eccentric piece.

Furthermore, temporary inner supports are arranged at intervals in the vertical direction inside the grounded eccentric member.

Furthermore, steel components are pasted on the surface of the frame columns of the old building, reinforcing steel bars are arranged on the top of the steel components, and new concrete structures are poured on the periphery of the frame columns to expand the cross-section of the frame columns.

Furthermore, the steel member includes equilateral angle steels arranged at the four corners of the frame column and steel bars arranged between adjacent equilateral angle steels, and the steel bars are arranged in plurality at vertical intervals along the height direction of the frame column.

Furthermore, the outer surfaces of the equilateral angle steels and steel bars are painted with anti-rust paint.

Furthermore, the self-sustaining simulated eccentric member is a core tube and is used as a pipe gallery.

Compared with the prior art, the deviation correction and reinforcement system for old buildings with eccentric high-position loads of the present invention has the following beneficial effects:

In the present invention, 1. the eccentricity effect of the ground eccentric part on the old building is eliminated by adding a self-supporting imitation eccentric part, and at the same time, the auxiliary correction core tube and the supplementary core tube eliminate the eccentricity effect of the off-ground eccentric part on the old building. The self-supporting imitation eccentric part is replaced with the same appearance after removal but without causing eccentricity, and at the same time, the original appearance of the building is retained to the greatest extent;

2. For the eccentric parts that cannot be removed without destroying the load-bearing components of the old building, a new correction core tube is built at the central symmetrical position, and a supplementary core tube is set to compensate for the damage caused by the correction core tube to the building's appearance, so that the building remains square;

3. The deviation-correcting core tube and the supplementary core tube expand the area of the old building and significantly improve the horizontal bearing capacity of the old building. The deviation-correcting and reinforcement purpose can be achieved by combining with a small amount of seismic shear walls;

4. Use the external buildings, corridors, and the passages between the deviation-correcting core tube and the supplementary core tube to form a temporary material passage of considerable length. The corridor can also be used as a material transfer platform before closing, reducing the impact of the "slender" characteristics of the old building and the cramped single-story space on material placement;

5. Due to the characteristics of the external building, it is necessary to share stairs and elevators with the old building. After the corridor is closed in the later period, it is used as a passage, so that the material transportation platform that originally needed to be demolished can be retained, and at the same time the actual use space of the external building is increased.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a plan view of the building after renovation;

Figure 2 is a plan view of the building before renovation;

Figure 3 is the elevation view of the renovated building;

Figure 4 is a plan view of the building foundation after the renovation.

In the figure, 1. old building; 11. frame column; 12. exterior wall; 13. eccentric piece off the ground; 14. eccentric piece on the ground; 2. self-supporting imitation eccentric piece; 3. deviation-correcting core tube; 4. supplementary core tube; 5. external building; 6. corridor; 7. seismic shear wall.

DETAILED DESCRIPTION

Taking the kiln tail tower of the Jinyuxingfa Science Park project in the northern area of Beijing Huairou Science City as an example, as shown in Figures 1-3, a correction and reinforcement system for an old building 1 with an eccentric high-position load, the old building 1 includes a foundation, a frame column 11 arranged on the top of the foundation, an outer wall 12 connected between adjacent frame columns 11, an eccentric piece 13 fixed to the outer surface of any outer wall 12, the outer wall 12 is an eccentric outer wall, and a ground-mounted eccentric piece 14 abutting against the eccentric outer wall, any position of the eccentric piece 13 is not in contact with the ground, the ground-mounted eccentric piece 14 is arranged vertically along the eccentric outer wall, and the bottom of the ground-mounted eccentric piece 14 is in contact with the ground;

A self-supporting imitation eccentric member 2 is arranged along the outer contour of the ground eccentric member 14, a correction core tube 3 is arranged at a central symmetrical position of the self-supporting imitation eccentric member 2 along the old building 1, a supplementary core tube 4 is arranged at an angle between the correction core tube 3 and the self-supporting imitation eccentric member 2 away from the eccentric outer wall, the correction core tube 3 and the supplementary core tube 4 are both traffic cores, an external building 5 is arranged at intervals on one side of the old building 1 away from the eccentric outer wall, and a corridor 6 is arranged at a position between the correction core tube 3 and the supplementary core tube 4 and extends toward the external building 5, so as to connect the external building 5 with the old building 1;

The old building 1, the deviation-correcting core tube 3 and the supplementary core tube 4 are assembled into a rectangle in the horizontal plane. The steel beam grids in the deviation-correcting core tube 3 and the reinforcement core tube penetrate the old building 1 and extend into the old building 1. The core tubes here refer to the square tubes surrounded by shear walls, and multiple layers of steel beam grids are arranged inside. The steel beam grids are arranged in this way to ensure that the two newly added and external core tubes are firmly connected to the old building 1 and effectively transmit force.

As shown in FIG4 , a new concrete structure is poured on the outside of the foundation to simultaneously support the old building 1 , the self-supporting imitation eccentric member 2 , the deviation-correcting core tube 3 , and the supplementary core tube 4 ;

A plurality of frame columns 11 are provided with seismic shear walls 7 in a direction parallel to the outer wall 12. The seismic shear walls 7 are fixedly connected to the adjacent frame columns 11, and the seismic shear walls 7 are attached to the outer wall 12. The deviation correction and reinforcement system is used to ensure that the structural safety of the eccentric and slender old building 1 meets the current standards while retaining the appearance of the old building 1. The seismic shear walls 7 correspond to the columns of the old building 1 one by one and are fixedly connected to the corresponding columns as a whole. The seismic shear walls 7 are arranged at the outer wall 12 position of the old building 1, replace the non-load-bearing wall at the position, and are integrated with the load-bearing wall at the position.

During construction, self-supporting simulated eccentric parts 2, deviation-correcting core tubes 3, and replacement core tubes 4 are built layer by layer from bottom to top. At the same time, beams, columns, load-bearing walls and floor slabs are repaired and reinforced layer by layer from bottom to top to ensure that the structural safety of the old building 1 meets the current standards.

The construction here is carried out layer by layer in order to utilize the floor slabs of the old building 1 and reduce the amount of scaffolding during the construction process.

The "slenderness" here can be recorded as a length-to-height ratio of less than 0.2 or a tower without a podium. Structural safety refers to the ability of a building structure to withstand various possible loads and prevent damage to the building under normal construction and normal use conditions. The current standard stipulates the calculation method.

The facade of the old building 1 has additional components that apply eccentric loads to the building. The additional components that are completely independent of the ground are recorded as off-ground eccentric components 13, and the additional components that are partially or completely dependent on the ground are recorded as grounded eccentric components 14.

The ground-mounted eccentric member 14 here is "ground-mounted", and can be gradually removed from top to bottom without affecting the load-bearing components of the old building 1 itself. However, the off-ground eccentric member 13 is completely supported by the old building 1, and cannot be removed without affecting the load-bearing components of the old building 1 itself, nor can it be replaced with a structure that does not cause eccentricity like the ground-mounted eccentric member 14. Therefore, it can only be retained as it is, and other methods are used to correct the deviation.

In this embodiment, since the foundation of the old building 1 is not allowed to be demolished, it is chosen here to combine and expand the original foundation of the old building 1, so as to strengthen the foundation without demolition and meet the needs of the subsequent new structure.

The self-supporting imitation eccentric member 2 has the same appearance as the ground eccentric member 14, is arranged at the position of the self-supporting imitation eccentric member 2, and is completely independent of the old building 1; during the use of the building, no personnel other than maintenance personnel are allowed to enter or exit the self-supporting imitation eccentric member 2;

The self-supporting imitation eccentric member 2 here imitates the appearance of the ground eccentric member 14, but it can exist independently of the old building 1, does not transfer its own load to the old building 1, and no longer applies an eccentric load to the old building 1. The self-supporting imitation eccentric member 2 here looks like a pipe. If there are people frequently entering and exiting the old building 1, a small amount of eccentric load will be applied to the old building 1. Therefore, it is necessary to prohibit unauthorized people from entering and exiting during use. Similarly, the self-supporting imitation eccentric member 2 here cannot be used as a warehouse (where goods frequently enter and exit).

Here, the deviation correction core tube 3 is corrected, and the supplementary core tube 4 prevents the deviation correction core tube 3 from affecting the appearance of the old building 1. At the same time, the two expand the cross section of the old building 1 and reinforce the old building 1.

The old building 1 is a rectangular cylindrical structure. The off-ground eccentric piece 13 is a metal component. The off-ground eccentric piece 13 contacts the eccentric outer wall. The ground-mounted eccentric piece 14 is the old elevator shaft. The height of the ground-mounted eccentric piece 14 is consistent with the height of the old building 1. A passage is arranged between the correction core tube 3 and the supplementary core tube 4 in the plane of the old building 1. The passage is connected to the corridor 6 as a straight passage. The external building 5 is cylindrical.

The core tube is used as a traffic core in conventional buildings (with stairs and elevators inside), and this is no exception. However, so many traffic cores are excessive for the old building 1, so a new building is connected to the old building 1 to make full use of the traffic core here. The reason why the corridor 6 is connected instead of being built close to the old building 1 is to preserve the general appearance of the old building 1. At the same time, when the concrete structure of the corridor 6 is completed, it can be used as a material transfer platform, and the external building 5 can also temporarily place materials to relieve the construction space pressure of the old building 1.

The old building 1 is a multi-story building. Each floor of the multi-story building is provided with a floor slab. The steel beam grid under the floor slab is fixedly connected to the deviation correction core tube 3 and the local core tube. There was originally no floor slab in the floors of the old building 1 with a height of more than 6 meters, and a new floor slab is set here.

The newly added floor slab here can expand the usable area in the old building 1 and strengthen the old building 1 at the same time.

The cross section of the side of the self-supporting pseudo-eccentric member 2 close to the ground-lifting eccentric member 13 is larger than the cross section of the ground-lifting eccentric member 13 , and the ground-lifting eccentric member 13 is embedded in the self-supporting pseudo-eccentric member 2 .

Here, the off-ground eccentric member 13 is at a high altitude and is arranged on the building outer wall 12, so there is a risk of falling off. Therefore, a self-supporting imitation eccentric member 2 is used here to provide additional support for it.

Temporary inner supports are arranged at intervals in the vertical direction inside the ground eccentric member 14 , and the temporary inner supports are removed from top to bottom synchronously with the ground eccentric member 14 .

The ground eccentric member 14 itself cannot support itself and has become fragile over the years. During the top-down removal process, it may collapse inwards due to loss of restraint. Therefore, temporary internal support is used here to avoid this problem.

A steel member is pasted on the surface of the frame column 11 of the old building 1 , and a reinforcing steel bar is arranged on the top of the steel member. A new concrete structure is poured around the periphery of the frame column 11 to expand the cross section of the frame column 11 .

The steel member includes equilateral angle steels arranged at four corners of the frame column 11 and steel bars arranged between adjacent equilateral angle steels. A plurality of steel bars are arranged at vertical intervals along the height direction of the frame column 11 .

Before gluing the steel to the column, the surface layer of the original structure frame column 11 shall be roughened. The frame column 11 within the range of the foundation top ~ 20.550m shall be reinforced by gluing steel. 160*10 equal-leg angle steels shall be used at the four corners, and 100*4@200 steel plates shall be used for reinforcement on the four sides. When arranging the reinforcing steel bars, the surface layer of the original structure frame column 11 shall also be roughened. The reinforcing steel bars shall be arranged within the range of 20.550~59.650m. When the main reinforcement of the reinforcing steel bars meets the floor slab, holes shall be drilled to pass through the floor slab. The cross-section of the new concrete structure expanded to the four sides is 100mm.

The outer surfaces of equilateral angle steels and steel bars are painted with anti-rust paint.

When removing the ground eccentric member 14 and the secondary structure of the old building 1, the concrete on the surface of the component to be repaired and reinforced is chiseled, and the chiseled steel bars are painted with anti-rust paint. The connection of steel bars requires the steel bars of the original structure to be exposed, and the connection of concrete of different ages requires the old concrete to be roughened.

In this embodiment, the self-supporting simulated eccentric member 2 is a core tube, which is used as a pipe gallery.

The core tube is self-sustaining and can further reinforce the old building 1 after being fixedly connected to it. The reason why it is used as a pipe gallery is that the building, as a laboratory building, has a series of complex pipelines including ultrapure water pipelines. These pipelines are specially arranged in the pipe gallery, saving the internal space of the building. At the same time, because the pipelines are arranged vertically in this pipe gallery, the vertically flowing fluid in the pipe will not bring eccentric loads to the old building 1.

The above embodiments are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims (9)

1. A correction and reinforcement system for an old building with an eccentric high load, the old building (1) comprising a foundation, a frame column (11) arranged on the top of the foundation, an outer wall (12) connected between adjacent frame columns (11), an eccentric member (13) above the ground fixed to the outer surface of any outer wall (12), the outer wall (12) being an eccentric outer wall, and a grounded eccentric member (14) abutting against the eccentric outer wall, any position of the eccentric member (13) above the ground not being in contact with the ground, the grounded eccentric member (14) being arranged vertically along the eccentric outer wall, and the bottom of the grounded eccentric member (14) being in contact with the ground; The invention is characterized in that a self-supporting imitation eccentric member (2) is arranged along the outer contour of the ground eccentric member (14); a correction core tube (3) is arranged along the central symmetrical position of the self-supporting imitation eccentric member (2) of the old building (1); a supplementary core tube (4) is arranged at an angle between the correction core tube (3) and the self-supporting imitation eccentric member (2) away from the eccentric outer wall; the correction core tube (3) and the supplementary core tube (4) are both traffic cores; an external building (5) is arranged at a distance from the eccentric outer wall of the old building (1); a corridor (6) is arranged between the external building (5) and the old building (1) at a distance between the correction core tube (3) and the supplementary core tube (4) and extends toward the external building (5), so as to connect the external building (5) with the old building (1); The old building (1), the deviation-correcting core tube (3) and the supplementary core tube (4) are assembled into a rectangle in the horizontal plane, and the steel beam grids in the deviation-correcting core tube (3) and the reinforcement core tube all penetrate the old building (1) and extend into the old building (1); A new concrete structure is poured on the outer side of the foundation to simultaneously support the old building (1), the self-supporting imitation eccentric member (2), the deviation-correcting core tube (3) and the replacement core tube (4); A plurality of frame columns (11) are provided with an earthquake-resistant shear wall (7) in a direction parallel to an outer wall (12); the earthquake-resistant shear wall (7) is fixedly connected to adjacent frame columns (11), and the earthquake-resistant shear wall (7) is attached to the outer wall (12). 2. A correction and reinforcement system for old buildings with eccentric high-position loads according to claim 1, characterized in that: the old building (1) is a rectangular cylindrical structure, the off-ground eccentric member (13) is a metal component, the off-ground eccentric member (13) contacts the eccentric outer wall, the ground-mounted eccentric member (14) is an old elevator shaft, the height of the ground-mounted eccentric member (14) is consistent with the height of the old building (1), a channel is provided between the correction core tube (3) and the supplementary core tube (4) in the plane of the old building (1), the channel is connected to the corridor (6) as a straight channel, and the external building (5) is cylindrical. 3. According to claim 1, a correction and reinforcement system for old buildings with eccentric high-position loads is characterized in that: the old building (1) is a multi-story building, each floor of the multi-story building is provided with a floor slab, and the steel beam grid under the floor slab is fixedly connected to the correction core tube (3) and the position core tube. 4. A correction and reinforcement system for old buildings with eccentric high-position loads according to claim 1, characterized in that the cross-section of the self-supporting pseudo-eccentric member (2) close to the off-ground eccentric member (13) is larger than the cross-section of the off-ground eccentric member (13), and the off-ground eccentric member (13) is embedded in the self-supporting pseudo-eccentric member (2). 5. A correction and reinforcement system for old buildings with eccentric high-position loads according to claim 1, characterized in that temporary internal supports are arranged at intervals in the vertical direction inside the ground eccentric member (14). 6. A correction and reinforcement system for old buildings with eccentric high loads according to claim 1, characterized in that: a steel component is pasted on the surface of the frame column (11) of the old building (1), a reinforcing steel bar is arranged on the top of the steel component, and a new concrete structure is cast on the periphery of the frame column (11) to expand the cross-section of the frame column (11). 7. A correction and reinforcement system for old buildings with eccentric high loads according to claim 6, characterized in that the steel component includes equilateral angle steels arranged at the four corners of the frame column (11) and steel bars arranged between adjacent equilateral angle steels, and the steel bars are arranged in multiple vertical intervals along the height direction of the frame column (11). 8. A correction and reinforcement system for old buildings with eccentric high loads according to claim 7, characterized in that the outer surfaces of the equilateral angle steels and steel bars are painted with anti-rust paint. 9. A correction and reinforcement system for old buildings with eccentric high-position loads according to claim 1, characterized in that the self-supporting pseudo-eccentric member (2) is a core tube used as a pipe gallery.