CN110067212B - Method for quickly repairing reinforced concrete pier after earthquake - Google Patents
Method for quickly repairing reinforced concrete pier after earthquake Download PDFInfo
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- CN110067212B CN110067212B CN201910376509.9A CN201910376509A CN110067212B CN 110067212 B CN110067212 B CN 110067212B CN 201910376509 A CN201910376509 A CN 201910376509A CN 110067212 B CN110067212 B CN 110067212B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
Abstract
The invention discloses a method for quickly repairing a reinforced concrete pier after an earthquake, and belongs to the field of civil engineering. The energy-consumption steel-reinforced concrete pier is composed of a bearing platform, a pier, high-fluidity early-strength cement mortar, a stainless steel sleeve, energy-consumption angle steel, an SMA combined ring spring, a horizontal screw, a vertical screw, a high-strength bolt, a longitudinal rib and a polytetrafluoroethylene film. The method has the idea that the pier fixedly connected with the original pier bottom is changed into a swinging pier. When repairing, firstly, the damaged concrete is removed, and the longitudinal bar of the plastic hinge area is cut off at the bottom of the pier. And (3) coating a stainless steel sleeve outside the plastic hinge area and pouring high-fluidity early-strength cement mortar into the sleeve. The energy-consuming angle steel and the SMA combined ring spring form an in-vitro energy-consuming system. The method is simple in construction operation and short in required time, the repaired pier becomes a swing system, and secondary damage of the repaired pier under strong earthquake is avoided. The stainless steel sleeve obviously improves the durability of the repaired pier. The external energy dissipation system has a self-reset function, avoids the damage of the angle steel, and is simple and easy to repair.
Description
Technical Field
The invention relates to a reinforced concrete pier repaired after an earthquake, in particular to a reinforced concrete pier repaired after an earthquake based on a swinging stress mechanism and an external energy consumption device.
Background
The reinforced concrete bridge pier is a main lateral force resistant component of bridge engineering, and the earthquake damage of a past earthquake at home and abroad shows that the reinforced concrete bridge pier is easy to damage under a strong earthquake, so that serious economic loss and casualties can be caused, and the timely development of disaster relief work after the earthquake can be seriously influenced, thereby aggravating earthquake disasters.
The bridge pier damaged after the earthquake is quickly repaired, so that the repairing and rebuilding cost can be saved, more importantly, the traffic lifeline project is quickly recovered, and the emergency rescue work after the earthquake is ensured to be timely carried out. Unfortunately, the research on the pier post-earthquake restoration technology developed at home and abroad is very few, and the following problems exist: 1, the pier after restoration has weak shock resistance and is easy to be damaged more seriously in the next earthquake. 2, the time required for repairing the bridge pier is long, and the requirement of rapidly keeping the traffic lifeline after the earthquake is not met. 3, the bridge pier after being repaired has poor durability and becomes a temporary building, and the bridge pier needs to be dismantled and rebuilt soon after being repaired.
By combining the background, the reinforced concrete bridge pier is easy to damage under strong earthquake, and the development of emergency rescue work after the earthquake is seriously influenced. The post-earthquake restoration technology of the bridge pier firstly requires quick restoration so as to quickly restore a traffic network, and in addition, the restored bridge pier does not become a temporary building and has excellent earthquake resistance and durability. Therefore, the bridge pier provided by the method can quickly recover the using function of the bridge pier after the earthquake, and the repaired bridge pier has good earthquake resistance and durability, so that the bridge pier becomes a great challenge for bridge engineering technicians.
Disclosure of Invention
The invention provides a method for quickly repairing a reinforced concrete pier after an earthquake, aiming at the technical problems. The energy-consumption steel-reinforced concrete pier is composed of a bearing platform, a pier, high-fluidity early-strength cement mortar, a stainless steel sleeve, energy-consumption angle steel, an SMA combined ring spring, a horizontal screw, a vertical screw, a high-strength bolt, a longitudinal rib and a polytetrafluoroethylene film. In the concrete operation, the longitudinal ribs of the damaged area are cut off, the damaged area is repaired by high-fluidity early-strength cement mortar, and the stainless steel sleeve is sleeved outside the high-fluidity early-strength cement mortar. An external energy dissipation system is formed by the energy dissipation angle steel and the SMA combined ring spring. The repair technology adopts high-fluidity early-strength cement mortar, so that the repair time after the earthquake is greatly saved, and the rapid repair is realized. In the stress mechanism, the longitudinal ribs are cut off, so that the repaired pier becomes a swing system, the high-flow early-strength cement mortar has high compressive strength, the stainless steel sleeve is wrapped outside the high-flow early-strength cement mortar to obviously enhance the shear strength of the high-flow early-strength cement mortar, the repaired pier is difficult to damage under strong shock, and the high-flow early-strength cement mortar has good durability. The external energy consumption system consisting of the energy consumption angle steel and the SMA combined ring spring can remarkably increase the energy consumption capacity of the repaired pier, and the use of the SMA combined ring spring remarkably increases the deformation capacity of the external energy consumption system and can reduce the residual displacement of the pier after earthquake, so that the angle steel is not easy to break under strong earthquake.
In order to achieve the purpose, the method can be realized by the following technical scheme:
the method for quickly repairing the reinforced concrete pier after the earthquake is characterized by comprising a bearing platform 1, a pier 2, high-fluidity early-strength cement mortar 3, a stainless steel sleeve 4, energy-consuming angle steel 5, an SMA combined ring spring 6, a horizontal screw 7-1, a vertical screw 7-2, a high-strength bolt 8, a longitudinal rib 9 and a polytetrafluoroethylene film 10.
The SMA combination ring spring 6 is composed of an SMA outer ring 12 and an SMA inner ring which are buckled with each other. The SMA outer ring 12 is made of nickel titanium alloy and the inner ring is made of high strength steel with yield strength of 500-1000 MPa. The SMA outer ring 12 and the inner ring are both annular and are alternately used from top to bottom. The inner ring surface of the SMA outer ring 12 is contacted with the outer ring surface of the inner ring and buckled with each other, and the polytetrafluoroethylene film 10 is attached to the outer ring surfaces of the inner ring and the inner ring of the SMA outer ring 12.
There are 2 SMA outer rings 12, each SMA outer ring 12 comprising 2 inner annular faces. The number of the inner rings is 3, including 1 each of an upper inner ring 13-1, a lower inner ring 13-3 and a middle inner ring 13-2. The upper and lower end faces of all the SMA outer and inner rings are planar. The upper inner ring 13-1 and the lower inner ring 13-3 respectively comprise 1 outer ring surface, and the middle inner ring 13-2 comprises 2 outer ring surfaces.
The fluidity of the high-fluidity early-strength cement mortar 3 is more than 300mm, and the compressive strength of the high-fluidity early-strength cement mortar at room temperature for 24 hours is more than 20 MPa.
The construction steps of the method for quickly repairing the reinforced concrete pier after the earthquake are as follows: firstly, cleaning up the concrete 11 crushed in the plastic hinge area of the pier 2, and cutting off the longitudinal ribs 9 at the bottom of the damaged area of the pier 2. And secondly, sleeving a stainless steel sleeve 4 outside the damaged area of the pier 2, reserving a horizontal hole in the stainless steel sleeve 4, and fixing a horizontal screw 7-1 in the stainless steel sleeve 4 through a high-strength bolt 8 after penetrating through the reserved horizontal hole. And thirdly, pouring high-fluidity early-strength cement mortar 3 in the stainless steel sleeve 4. Fourthly, drilling a hole in the bearing platform 1, pouring high-fluidity early-strength cement mortar 3 into the hole, and then implanting a vertical screw 7-2. And fifthly, installing energy-consuming angle steel 5 between the pier 2 and the bearing platform 1. The vertical limb of the energy-consuming angle steel 5 is connected with the stainless steel sleeve 4 through a high-strength bolt 8 and a horizontal screw 7-1. The horizontal limb of the energy-consuming angle steel 5 is connected with the bearing platform 1 through a vertical screw 7-2. Sixthly, mounting an SMA combined ring spring 6 on the upper part of the horizontal limb of the energy consumption angle steel 5. The SMA combined ring spring 6 is fixed on the upper part of the horizontal limb of the energy consumption angle steel 5 through a high-strength bolt 8 on the upper part of the SMA combined ring spring. The bearing capacity of the SMA combined ring spring 6 before self-locking is smaller than the bearing capacity corresponding to yielding of the energy consumption angle steel 5.
The horizontal screw 7-1 and the vertical screw 7-2 are both provided with threads. 2 rows of horizontal screws 7-1 are arranged along the height direction of the stainless steel sleeve 4, the horizontal screws 7-1 penetrate through the stainless steel sleeve 4, and high-strength bolts 8 are arranged on the inner side of the stainless steel sleeve 4 so as to facilitate anchoring of the horizontal screws 7-1. And the vertical limb of the energy-consuming angle steel 5 is still connected with the pier 2 through a high-strength bolt 8 at the outer side of the stainless steel sleeve 4. The vertical screws 7-2 are anchored in the bearing platform 1 through the high-fluidity early-strength cement mortar 3, and only 1 row of the vertical screws 7-2 is arranged.
A gap of 20mm-30mm is reserved between the stainless steel sleeve 4 and the bearing platform 1.
The invention adopting the technical scheme comprises the following steps:
1. the repaired pier has high shock resistance. The stainless steel sleeve is wrapped outside the high-fluidity early-strength cement mortar, so that the bonding capacity of the high-fluidity early-strength cement mortar and the existing concrete is obviously improved, the compressive strength and the ductility of the high-fluidity early-strength cement mortar are improved, and the shear strength of the high-fluidity early-strength cement mortar is improved. So that the repaired bridge pier is difficult to damage.
2. On the stress mechanism, because the longitudinal ribs are cut off during repair, the tensile strength of the high-fluidity early-strength cement mortar and the concrete is not high, the repaired pier generates swing reaction under strong earthquake, the earthquake resistance requirement of the pier is reduced through the swing reaction, and the earthquake resistance of the repaired pier is further enhanced and is not damaged.
3. The repair technology has less field wet operation and convenient construction. The poured high-fluidity early-strength cement mortar can be hardened in a short time and has high compressive strength, the required time of the repair technology is short, and the effect of quickly repairing after an earthquake can be realized.
4. The stainless steel sleeve, the high-flow early-strength cement mortar and the like have good durability, and the durability of the repaired pier is obviously improved.
5. The energy-consuming angle steel and the SMA combined ring spring form an external energy-consuming system. Firstly, the external energy consumption system can be replaced quickly, and even if the external energy consumption system is damaged under the strong earthquake in the future, the external energy consumption system can be repaired quickly. Secondly, the SMA combined ring spring is connected with the energy-consuming angle steel in series for use, so that the deformation requirement of the energy-consuming angle steel is obviously reduced, the energy-consuming angle steel is not easy to break and damage, and the deformation capacity of an external energy-consuming system is obviously improved.
And 6, polytetrafluoroethylene films are attached to the outer ring surface of the inner ring and the outer ring surface of the inner ring of the SMA outer ring, and a small friction force is formed between the polytetrafluoroethylene films. Under the compression state, the SMA combined ring spring mainly depends on the tension energy consumption of the SMA outer ring, and the SMA outer ring is made of nickel-titanium alloy, so that the SMA outer ring contracts after being unloaded, and the SMA combined ring spring has good self-resetting capability.
7. In design, the bearing capacity of the SMA combined ring spring before self-locking is designed to be smaller than the bearing capacity corresponding to yielding of the energy-consuming angle steel. When the SMA combination ring spring is pressed and deformed to a certain degree, the inner rings are contacted with each other, the SMA outer ring is not tensioned any more, and the SMA combination ring spring is self-locked. Because the SMA combination ring spring has a self-locking function, when the deformation of the SMA combination ring spring reaches the maximum, the SMA combination ring spring is self-locked, and the load after self-locking is mainly born by the inner ring made of high-strength steel, so that the SMA combination ring spring can be effectively protected from being damaged. Before the SMA combination ring spring is subjected to self-locking, because the energy-consuming angle steel is not yet yielded, and the SMA combination ring spring has good self-resetting capability, after unloading, the SMA combination ring spring and the energy-consuming angle steel automatically reset, and the residual deformation of the pier can be obviously reduced.
Compared with the traditional bridge pier post-earthquake restoration technology, the invention has the following 6 outstanding advantages: firstly, the anti-seismic capacity of the repaired pier is high. The anti-seismic requirement for repairing the pier after the earthquake is reduced by adopting the swing system, and the stainless steel sleeve is wrapped outside the high-fluidity early-strength cement mortar, so that the bonding capacity of the high-fluidity early-strength cement mortar and the existing concrete is remarkably improved, the compressive strength and the ductility of the high-fluidity early-strength cement mortar are improved, and the shear strength of the repaired pier is improved. Secondly, the repair technology has less field wet operation and convenient construction, and the high-fluidity early-strength cement mortar can be quickly hardened, thereby realizing the purpose of quick repair after earthquake. Thirdly, the repaired bridge pier has good durability. Because the high-flow early-strength cement mortar and the stainless steel sleeve both have good durability, the repaired pier can be used for a long time. Fourthly, the repaired bridge pier has good energy consumption capability, and the external energy consumption device is convenient to repair and replace. The energy-consuming angle steel and the SMA combined ring spring are connected in series for use, so that the deformability of an energy-consuming system is obviously improved, and the energy-consuming angle steel and the SMA combined ring spring are convenient to repair and replace even if an external energy-consuming device is damaged. Before the energy-consuming angle steel is yielded, the SMA combined ring spring has self-locking and self-resetting functions, so that the external energy-consuming system has remarkable self-resetting capability, and the post-earthquake residual deformation of the repaired pier can be remarkably reduced. Compared with other post-earthquake restoration technologies, the stress mechanism of the post-earthquake restoration technology provided by the invention is simpler and more clear, and the design is convenient.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
The invention is shown in 7 figures, wherein:
fig. 1 is a general schematic of the present invention.
Fig. 2 is a schematic view of the bridge pier before repair.
FIG. 3 is a schematic view of the bridge pier broken concrete after being removed and the longitudinal bars being cut off.
FIG. 4 is a schematic diagram of the present invention after installation of a stainless steel sleeve during the reconditioning process.
FIG. 5 is a cross-sectional view of an SMA combination ring spring of the present invention.
FIG. 6 is a perspective view of an SMA combination ring spring of the present invention.
FIG. 7 is a perspective view and an assembly view of various components of the SMA combination ring spring of the present invention.
In the figure: 1-cushion cap, 2-pier, 3-high-fluidity early-strength cement mortar, 4-stainless steel sleeve, 5-energy-consumption angle steel, 6-SMA combined ring spring, 7-1-horizontal screw, 7-2-vertical screw, 8-high-strength bolt, 9-longitudinal rib, 10-polytetrafluoroethylene film, 11-crushed concrete, 12-SMA outer ring, 13-1-upper inner ring, 13-2-middle inner ring and 13-3-lower inner ring.
Detailed Description
The method for quickly repairing the reinforced concrete pier after the earthquake as shown in the figure mainly comprises a bearing platform 1, a pier 2, high-fluidity early-strength cement mortar 3, a stainless steel sleeve 4, energy-consuming angle steel 5, an SMA combined ring spring 6, a horizontal screw 7-1, a vertical screw 7-2, a high-strength bolt 8, a longitudinal rib 9 and a polytetrafluoroethylene film 10.
The SMA combination ring spring 6 is composed of an SMA outer ring 12 and an SMA inner ring which are buckled with each other. The SMA outer ring 12 is made of nickel titanium alloy and the inner ring is made of high strength steel with yield strength of 500-1000 MPa. The SMA outer ring 12 and the inner ring are both annular and are alternately used from top to bottom. The inner ring surface of the SMA outer ring 12 is contacted with the outer ring surface of the inner ring and buckled with each other, and the polytetrafluoroethylene film 10 is attached to the outer ring surfaces of the inner ring and the inner ring of the SMA outer ring 12.
There are 2 SMA outer rings 12, each SMA outer ring 12 comprising 2 inner annular faces. The number of the inner rings is 3, including 1 each of an upper inner ring 13-1, a lower inner ring 13-3 and a middle inner ring 13-2. The upper and lower end faces of all the SMA outer and inner rings are planar. The upper inner ring 13-1 and the lower inner ring 13-3 respectively comprise 1 outer ring surface, and the middle inner ring 13-2 comprises 2 outer ring surfaces.
The fluidity of the high-fluidity early-strength cement mortar 3 is more than 300mm, and the compressive strength of the high-fluidity early-strength cement mortar at room temperature for 24 hours is more than 20 MPa.
The construction steps of the method for quickly repairing the reinforced concrete pier after the earthquake are as follows: firstly, cleaning up the concrete 11 crushed in the plastic hinge area of the pier 2, and cutting off the longitudinal ribs 9 at the bottom of the damaged area of the pier 2. And secondly, sleeving a stainless steel sleeve 4 outside the damaged area of the pier 2, reserving a horizontal hole in the stainless steel sleeve 4, and fixing a horizontal screw 7-1 in the stainless steel sleeve 4 through a high-strength bolt 8 after penetrating through the reserved horizontal hole. And thirdly, pouring high-fluidity early-strength cement mortar 3 in the stainless steel sleeve 4. Fourthly, drilling a hole in the bearing platform 1, pouring high-fluidity early-strength cement mortar 3 into the hole, and then implanting a vertical screw 7-2. And fifthly, installing energy-consuming angle steel 5 between the pier 2 and the bearing platform 1. The vertical limb of the energy-consuming angle steel 5 is connected with the stainless steel sleeve 4 through a high-strength bolt 8 and a horizontal screw 7-1. The horizontal limb of the energy-consuming angle steel 5 is connected with the bearing platform 1 through a vertical screw 7-2. Sixthly, mounting an SMA combined ring spring 6 on the upper part of the horizontal limb of the energy consumption angle steel 5. The SMA combined ring spring 6 is fixed on the upper part of the horizontal limb of the energy consumption angle steel 5 through a high-strength bolt 8 on the upper part of the SMA combined ring spring. The bearing capacity of the SMA combined ring spring 6 before self-locking is smaller than the bearing capacity corresponding to yielding of the energy consumption angle steel 5.
The horizontal screw 7-1 and the vertical screw 7-2 are both provided with threads. 2 rows of horizontal screws 7-1 are arranged along the height direction of the stainless steel sleeve 4, the horizontal screws 7-1 penetrate through the stainless steel sleeve 4, and high-strength bolts 8 are arranged on the inner side of the stainless steel sleeve 4 so as to facilitate anchoring of the horizontal screws 7-1. And the vertical limb of the energy-consuming angle steel 5 is still connected with the pier 2 through a high-strength bolt 8 at the outer side of the stainless steel sleeve 4. The vertical screws 7-2 are anchored in the bearing platform 1 through the high-fluidity early-strength cement mortar 3, and only 1 row of the vertical screws 7-2 is arranged.
A gap of 20mm-30mm is reserved between the stainless steel sleeve 4 and the bearing platform 1.
The invention adopting the technical scheme comprises the following steps:
1. the repaired pier has high shock resistance. The stainless steel sleeve is wrapped outside the high-fluidity early-strength cement mortar, so that the bonding capacity of the high-fluidity early-strength cement mortar and the existing concrete is obviously improved, the compressive strength and the ductility of the high-fluidity early-strength cement mortar are improved, and the shear strength of the high-fluidity early-strength cement mortar is improved. So that the repaired bridge pier is difficult to damage.
2. On the stress mechanism, because the longitudinal ribs are cut off during repair, the tensile strength of the high-fluidity early-strength cement mortar and the concrete is not high, the repaired pier generates swing reaction under strong earthquake, the earthquake resistance requirement of the pier is reduced through the swing reaction, and the earthquake resistance of the repaired pier is further enhanced and is not damaged.
3. The repair technology has less field wet operation and convenient construction. The poured high-fluidity early-strength cement mortar can be hardened in a short time and has high compressive strength, the required time of the repair technology is short, and the effect of quickly repairing after an earthquake can be realized.
4. The stainless steel sleeve, the high-flow early-strength cement mortar and the like have good durability, and the durability of the repaired pier is obviously improved.
5. The energy-consuming angle steel and the SMA combined ring spring form an external energy-consuming system. Firstly, the external energy consumption system can be replaced quickly, and even if the external energy consumption system is damaged under the strong earthquake in the future, the external energy consumption system can be repaired quickly. Secondly, the SMA combined ring spring is connected with the energy-consuming angle steel in series for use, so that the deformation requirement of the energy-consuming angle steel is obviously reduced, the energy-consuming angle steel is not easy to break and damage, and the deformation capacity of an external energy-consuming system is obviously improved.
And 6, polytetrafluoroethylene films are attached to the outer ring surface of the inner ring and the outer ring surface of the inner ring of the SMA outer ring, and a small friction force is formed between the polytetrafluoroethylene films. Under the compression state, the SMA combined ring spring mainly depends on the tension energy consumption of the SMA outer ring, and the SMA outer ring is made of nickel-titanium alloy, so that the SMA outer ring contracts after being unloaded, and the SMA combined ring spring has good self-resetting capability.
7. In design, the bearing capacity of the SMA combined ring spring before self-locking is designed to be smaller than the bearing capacity corresponding to yielding of the energy-consuming angle steel. When the SMA combination ring spring is pressed and deformed to a certain degree, the inner rings are contacted with each other, the SMA outer ring is not tensioned any more, and the SMA combination ring spring is self-locked. Because the SMA combination ring spring has a self-locking function, when the deformation of the SMA combination ring spring reaches the maximum, the SMA combination ring spring is self-locked, and the load after self-locking is mainly born by the inner ring made of high-strength steel, so that the SMA combination ring spring can be effectively protected from being damaged. Before the SMA combination ring spring is subjected to self-locking, because the energy-consuming angle steel is not yet yielded, and the SMA combination ring spring has good self-resetting capability, after unloading, the SMA combination ring spring and the energy-consuming angle steel automatically reset, and the residual deformation of the pier can be obviously reduced.
In conclusion, the invention provides a method for quickly repairing a reinforced concrete pier after an earthquake. The high-strength concrete pier mainly comprises a bearing platform, a pier, high-fluidity early-strength cement mortar, a stainless steel sleeve, energy-consuming angle steel, an SMA combined ring spring, a horizontal screw, a vertical screw, a high-strength bolt, a longitudinal rib and a polytetrafluoroethylene film. Compared with the traditional bridge pier post-earthquake restoration technology, the invention has the following 6 outstanding advantages: firstly, the anti-seismic capacity of the repaired pier is high. The anti-seismic requirement for repairing the pier after the earthquake is reduced by adopting the swing system, and the stainless steel sleeve is wrapped outside the high-fluidity early-strength cement mortar, so that the bonding capacity of the high-fluidity early-strength cement mortar and the existing concrete is remarkably improved, the compressive strength and the ductility of the high-fluidity early-strength cement mortar are improved, and the shear strength of the repaired pier is improved. Secondly, the repair technology has less field wet operation and convenient construction, and the high-fluidity early-strength cement mortar can be quickly hardened, thereby realizing the purpose of quick repair after earthquake. Thirdly, the repaired bridge pier has good durability. Because the high-flow early-strength cement mortar and the stainless steel sleeve both have good durability, the repaired pier can be used for a long time. Fourthly, the repaired bridge pier has good energy consumption capability, and the external energy consumption device is convenient to repair and replace. The energy-consuming angle steel and the SMA combined ring spring are connected in series for use, so that the deformability of an energy-consuming system is obviously improved, and the energy-consuming angle steel and the SMA combined ring spring are convenient to repair and replace even if an external energy-consuming device is damaged. Before the energy-consuming angle steel is yielded, the SMA combined ring spring has self-locking and self-resetting functions, so that the external energy-consuming system has remarkable self-resetting capability, and the post-earthquake residual deformation of the repaired pier can be remarkably reduced. Compared with other post-earthquake restoration technologies, the stress mechanism of the post-earthquake restoration technology provided by the invention is simpler and more clear, and the design is convenient.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A method for quickly repairing a reinforced concrete pier after earthquake is characterized in that the structure comprises a bearing platform (1), the pier (2), high-fluidity early-strength cement mortar (3), a stainless steel sleeve (4), energy-dissipating angle steel (5), an SMA combined ring spring (6), a horizontal screw (7-1), a vertical screw (7-2), a high-strength bolt (8), a longitudinal rib (9) and a polytetrafluoroethylene film (10);
the SMA combined ring spring (6) consists of an SMA outer ring (12) and an inner ring which are buckled with each other; the SMA outer ring (12) is made of nickel-titanium alloy, and the inner ring is made of high-strength steel with the yield strength of 500-1000 MPa; the SMA outer ring (12) and the SMA inner ring are both annular and are alternately adopted from top to bottom; the inner ring surface of the SMA outer ring (12) is contacted with the outer ring surface of the inner ring and buckled with each other, and the inner ring surface of the SMA outer ring (12) and the outer ring surface of the inner ring are both externally pasted with a polytetrafluoroethylene film (10);
the number of the SMA outer rings (12) is 2, and each SMA outer ring (12) comprises 2 inner ring surfaces; the number of the inner rings is 3, including 1 each of an upper inner ring (13-1), a lower inner ring (13-3) and a middle inner ring (13-2); the upper end surfaces and the lower end surfaces of all the SMA outer rings (12) and the SMA inner rings are planes; the upper inner ring (13-1) and the lower inner ring (13-3) respectively comprise 1 outer ring surface, and the middle inner ring (13-2) comprises 2 outer ring surfaces;
the fluidity of the high-fluidity early-strength cement mortar (3) is more than 300mm, and the compressive strength of the high-fluidity early-strength cement mortar at normal temperature for 24 hours is more than 20 MPa;
the construction steps are as follows: firstly, cleaning up concrete (11) crushed in a plastic hinge area of a pier (2), and cutting off longitudinal ribs (9) at the bottom of the damaged area of the pier (2); secondly, a stainless steel sleeve (4) is sleeved outside a damage area of the pier (2), a horizontal hole is reserved in the stainless steel sleeve (4), and a horizontal screw (7-1) penetrates through the reserved horizontal hole and is fixed on the stainless steel sleeve (4) through a high-strength bolt (8); thirdly, pouring high-fluidity early-strength cement mortar (3) inside the stainless steel sleeve (4); fourthly, drilling a hole in the bearing platform (1), pouring high-fluidity early-strength cement mortar (3) into the hole, and then implanting a vertical screw (7-2); fifthly, installing energy-consuming angle steel (5) between the pier (2) and the bearing platform (1); the vertical limb of the energy-consuming angle steel (5) is connected with the stainless steel sleeve (4) through a high-strength bolt (8) and a horizontal screw (7-1); the horizontal limb of the energy-consuming angle steel (5) is connected with the bearing platform (1) through a vertical screw (7-2); sixthly, mounting an SMA combined ring spring (6) on the upper part of a horizontal limb of the energy-consuming angle steel (5); the SMA combined ring spring (6) is fixed on the upper part of the horizontal limb of the energy-consuming angle steel (5) through a high-strength bolt (8) on the upper part of the SMA combined ring spring; when the SMA combination ring spring is pressed and deformed to a certain degree, the inner rings are contacted with each other, the SMA outer ring is not stretched any more, and the SMA combination ring spring is self-locked;
the bearing capacity of the SMA combined ring spring (6) before self-locking is smaller than the bearing capacity corresponding to yielding of the energy consumption angle steel (5).
2. The method for rapidly repairing the reinforced concrete pier after the earthquake as claimed in claim 1, wherein the method comprises the following steps: the horizontal screw (7-1) and the vertical screw (7-2) are both provided with threads; 2 rows of horizontal screws (7-1) are arranged along the height direction of the stainless steel sleeve (4), the horizontal screws (7-1) penetrate through the stainless steel sleeve (4), and a high-strength bolt (8) is arranged on the inner side of the stainless steel sleeve (4) so as to facilitate the anchoring of the horizontal screws (7-1); the vertical limb of the energy-consuming angle steel (5) is connected with the pier (2) through a high-strength bolt (8) at the outer side of the stainless steel sleeve (4); the vertical screws (7-2) are anchored in the bearing platform (1) through high-fluidity early-strength cement mortar (3), and only 1 row of the vertical screws (7-2) is arranged.
3. The method for rapidly repairing the reinforced concrete pier after the earthquake as claimed in claim 1, wherein the method comprises the following steps: a gap of 20mm-30mm is reserved between the stainless steel sleeve (4) and the bearing platform (1).
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| CN110565457A (en) * | 2019-08-21 | 2019-12-13 | 中铁四院集团岩土工程有限责任公司 | Method for renovating exposed reinforcing steel bars of ballastless track base and repairing structure |
| CN111851261A (en) * | 2020-06-19 | 2020-10-30 | 重庆大学 | Self-resetting concrete filled steel tube pier structure provided with replaceable steel coupling beams and construction method of self-resetting concrete filled steel tube pier structure |
| CN113005922B (en) * | 2021-03-04 | 2022-12-27 | 南京工业大学 | Complete method for quickly reinforcing seismic damage pier through steel sleeve wrapping |
| CN113322794B (en) * | 2021-06-07 | 2022-09-13 | 同济大学 | Anti-roll section assembling swing single-column pier multiple damping system |
| CN114561867B (en) * | 2022-03-10 | 2024-03-15 | 广州市市政工程设计研究总院有限公司 | Sectional type self-resetting bridge pier with replaceable energy consumption piece after earthquake |
| CN114960408B (en) * | 2022-04-26 | 2024-03-01 | 郑州大学 | Intelligent assembled bridge pier with energy consumption and shock absorption device |
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| AU5586080A (en) * | 1980-02-25 | 1981-09-03 | Moore, C.D. | Reconditioning structural piling |
| JP3036406B2 (en) * | 1995-06-30 | 2000-04-24 | 株式会社大林組 | Bridge pier reinforcement structure |
| JP4035239B2 (en) * | 1998-10-21 | 2008-01-16 | 株式会社安井建築設計事務所 | Columnar structure with earthquake resistance |
| CN101769085A (en) * | 2009-01-04 | 2010-07-07 | 李靖 | Anti-seismic device of building |
| CN103306219B (en) * | 2013-06-25 | 2015-07-22 | 福州大学 | Method for quickly repairing and reinforcing post-earthquake damaged pier |
| CN104805775B (en) * | 2015-05-07 | 2016-07-06 | 福州大学 | The construction method of recovery technique after the shake of a kind of RC bridge pier |
| CN106638946B (en) * | 2016-12-19 | 2022-05-17 | 海南大学 | Connecting structure of reinforced concrete swing column and foundation |
| CN108590302B (en) * | 2018-05-08 | 2019-10-01 | 同济大学 | A kind of earthquake for waving core exempts to damage Self-resetting energy-consuming device |
| CN108589515B (en) * | 2018-05-10 | 2019-04-26 | 长安大学 | A method of shake rear abutment is reinforced using ultra-tough fiber concrete |
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