CN110725220A - Construction method for dismantling pier - Google Patents
Construction method for dismantling pier Download PDFInfo
- Publication number
- CN110725220A CN110725220A CN201911026361.2A CN201911026361A CN110725220A CN 110725220 A CN110725220 A CN 110725220A CN 201911026361 A CN201911026361 A CN 201911026361A CN 110725220 A CN110725220 A CN 110725220A
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- Prior art keywords
- pier
- jacking
- cutting
- construction method
- demolishing
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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
-
- 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
Abstract
The invention relates to a construction method for dismantling piers, which specifically comprises the following steps: drawing out a jacking chamber on the non-toppling side of the bridge pier; installing jacking equipment into a jacking chamber; manufacturing a cutting hole on the pier to be used as a rotating shaft when the pier topples; cutting the bridge pier by taking the cutting hole as a reference, and dividing the jacking chamber into two parts by a cutting seam formed in the cutting process; and jacking the pier by using jacking equipment, so that the part of the pier, which is positioned above the jacking equipment, is inclined until the part is inclined. The method is used for dismantling the existing bridge piers, is simple to operate, fast in construction progress and high in safety, and especially can finish dismantling operation by cutting the bridge piers once, so that the construction period can be effectively shortened, and the influence of dismantling work on the construction period is reduced.
Description
Technical Field
The invention relates to the technical field of construction of constructional engineering, in particular to a construction method for dismantling a pier.
Background
With the gradual increase of the investment of national infrastructure, the development of railways is more and more advanced. However, the problems of removing existing piers of a bridge can be faced when newly built projects are parallel, crossed, strided upwards and penetrated downwards and existing railways are introduced and business line reconstruction projects are introduced, and how to safely and quickly remove piers in construction near the existing lines or the existing lines does not affect the safety of the business lines and the normal use of equipment, and becomes a difficult point for removing piers beside the existing lines.
The traditional demolition method is to set up scaffolds around the pier and then demolish the pier by using a cutting and hoisting method, but the demolition method has the disadvantages of low construction speed, high demolition cost and incapability of meeting the progress requirement of a construction period, workers need to cut the scaffolds and then hoist the cut parts to the bottom surface for crushing or transporting to a garbage storage point, so that the uncertain factors in the process are very many, especially the final cutting process and hoisting process are very easy to cause safety accidents such as slipping and dropping, and the potential safety hazard is large.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the construction method for dismantling the pier, which has lower construction difficulty and higher operation safety.
The above object of the present invention is achieved by the following technical solutions:
a construction method for dismantling piers comprises the following steps:
drawing out a jacking chamber on the non-toppling side of the bridge pier;
installing jacking equipment into a jacking chamber;
manufacturing a cutting hole on the pier to be used as a rotating shaft when the pier topples;
cutting the bridge pier by taking the cutting hole as a reference, and dividing the jacking chamber into two parts by a cutting seam formed in the cutting process;
and jacking the pier by using jacking equipment, so that the part of the pier, which is positioned above the jacking equipment, is inclined until the part is inclined.
Through adopting above-mentioned technical scheme, after the staff produced jacking room and cutting joint on the pier, utilized jacking equipment to fall the pier, compare with traditional mode of demolising, this kind of mode need not set up the scaffold frame, demolish the in-process and need not hoist and mount, only need once cut the pier, and the construction degree of difficulty and cost can both reduce, especially can effectively shorten the time limit for a project, reduce and demolish the influence of work to current construction.
The invention is further configured to: before jacking the pier, the contour line of the pier is released in the site on the side where the pier topples, and then the occupied area when the pier topples is cleared according to the contour line.
Through adopting above-mentioned technical scheme, can incline and mark off the influence area when a pier is emptyd in the side of empting of pier, clear up personnel, equipment and material etc. in the influence area in advance, avoid causing the unnecessary loss when the pier is emptyd.
The invention is further configured to: digging a foundation pit in the occupied area, so that the bridge pier can fall into the foundation pit when toppling over.
By adopting the technical scheme, the pier can collide violently in the collision process with the ground, a large amount of smoke dust, flying stones and the like can be generated in the process, and therefore a foundation pit is dug in the occupied area, the pier can be poured into the foundation pit, and therefore part of smoke dust and flying stones can be intercepted, on one hand, the influence on the surrounding environment in the dismantling process is reduced, and on the other hand, people, equipment, vehicles and the like around are prevented from being injured by splashed flying stones.
The invention is further configured to: and digging soil at the bottom of the foundation pit loose.
Through adopting above-mentioned technical scheme, the pier is in the back of contacting with the foundation ditch bottom surface, and the foundation ditch bottom surface is out of shape rapidly, lives the pier parcel, can form a buffering like this, reduces the fierce degree of the two striking, plays the effect that further reduces smoke and dust and flying stone volume, can also weaken the vibrations degree on ground simultaneously, reduces its influence to present building and present facility etc. on every side.
The invention is further configured to: and laying a cushion layer on the bottom surface of the foundation pit.
By adopting the technical scheme, the cushion layer also has a buffering effect, the impact severity of the cushion layer and the base material is reduced, on one hand, the generation amount of smoke dust, flying stones and the like in the impact process is reduced, on the other hand, the vibration degree of the ground can be weakened, and the influence of the vibration degree on the surrounding existing buildings, existing facilities and the like is reduced.
The invention is further configured to: before the pier is cut, the pier is reinforced, so that the pier is prevented from inclining or toppling.
Through adopting above-mentioned technical scheme, can reduce the cutting in-process pier and take place the probability of rocking and the range when taking place to rock, can guarantee at the staff's of pier safety.
The invention is further configured to: when the cutting hole is made in the pier, the steel bar between the cutting hole and the toppling side of the pier is reserved.
Through adopting above-mentioned technical scheme, the reinforcing bar that remains can play the connection effect, and the part that will be located the cutting joint both sides is carried together, avoids these two parts to take place relative slip among the cutting process, leads to the pier to topple over to the direction that can't foresee.
The invention is further configured to: before jacking the pier, a rotating shaft is placed in the cutting hole to prevent the cutting hole from deforming in the jacking process.
Through adopting above-mentioned technical scheme, the pivot can play effectual supporting role, avoids the pier to be located the part above the cutting seam to sliding at the initial stage of jacking.
The invention is further configured to: the cutting holes are horizontally arranged.
Through adopting above-mentioned technical scheme, can make the pier be located the part of cutting seam above and topple over according to the orientation of setting for, the condition that the skew takes place for the direction of toppling over can not appear.
The invention is further configured to: after the jacking equipment is installed in the jacking chamber, a supporting structure is installed in the jacking chamber, and the stability of the jacking equipment is guaranteed.
Through adopting above-mentioned technical scheme, bearing structure can play the effect of fixed jacking equipment, avoids it to take place to incline and for the slip of pier in the course of the work, further improves the security of operation.
In conclusion, the beneficial technical effects of the invention are as follows:
demolish the in-process of pier, the staff makes jacking room and cutting joints on the pier, then utilizes jacking equipment to fall the pier, compares with traditional mode of demolising, this kind of mode need not set up the scaffold frame, demolish the in-process and need not hoist and mount, only need once cut the pier, the construction degree of difficulty and cost can both reduce, especially can effectively shorten the time limit for a project, demolish fast current pier, effectively reduced demolish the influence of work to current construction.
Drawings
Fig. 1 is a flow chart of a construction method according to an embodiment of the present invention.
Fig. 2 is a schematic construction diagram provided in the embodiment of the present invention.
Fig. 3 is a construction schematic diagram before dismantling a pier according to an embodiment of the present invention.
Fig. 4 is a schematic construction diagram of a pier inclined according to an embodiment of the present invention.
Fig. 5 is a schematic view illustrating a foundation pit dug on an inclined side of a pier according to an embodiment of the present invention.
Fig. 6 is a schematic view of an inner pad layer of a foundation pit according to an embodiment of the present invention.
Fig. 7 is a schematic view illustrating reinforcing of a pier according to an embodiment of the present invention.
Fig. 8 is another schematic view illustrating reinforcement of a pier according to an embodiment of the present invention.
In the figure, 11, piers, 12, jacking chambers, 13, cutting holes, 14, cutting seams, 15, jacking equipment, 16, foundation pits, 17, the ground, 18, cushion layers, 19, rotating shafts, 20, supporting structures, 21, contour lines, 22 and wedge-shaped cushion blocks.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a construction method for removing a pier disclosed in an embodiment of the present invention includes the following steps:
s101, the jack-up chamber 12 is taken out on the non-toppling side of the pier 11.
For the sake of clarity of description, it is specified here that the side of pier 11 in contact with ground 17 when it is tipped is its tipped side, the side opposite to the tipped side is its non-tipped side, and jacking chamber 12 is located on the non-tipped side of pier 11, and its function is to provide operating space for jacking equipment 15.
In one embodiment, the process of manufacturing the jacking chamber 12 includes: a hole is continuously drilled on a side surface of the pier 11 with a water drill to form a contour of the jack-up chamber 12, and then reinforcing bars, concrete, etc. in the contour are crushed with a crushing hammer, and finally, taken out.
In an embodiment, the distance between the top surface of the jacking chamber 12 and the ground 17 where the pier 11 is located is controlled to be about 1.5 meters, so that enough operating height can be provided for workers, the workers can directly stand on the ground 17 to work, and on the other hand, the reserved part can effectively intercept flying stones splashed out by the pier 11 in the collision process with the ground 17, so that an effective protection effect is achieved, and the workers are prevented from being injured by smashing.
In another embodiment, the top and bottom surfaces of the jacking chamber 12 should be made as flat as possible in order to provide a stable operating environment for the jacking device 15. Because in the jacking process, if jacking equipment 15 and jacking room 12's contact surface unevenness, then at its in-process of exerting thrust to pier 11, the phenomenon of skidding appears very easily, and jacking equipment 15 probably follows the interior roll-off of jacking room 12 on the one hand, injures the staff by a crashing object, and pier 11 that on the other hand inclined can take place to rock this moment, can topple over to all around at random when serious, causes extra personnel, equipment and other property losses.
And S102, installing the jacking equipment 15 into the jacking chamber 12.
The step is a preparation operation before jacking, and the installation process needs to be stable, so that the jacking equipment 15 can be always kept stable in the jacking process, and the conditions that the construction safety is endangered by shaking, slipping and the like do not occur.
Referring to fig. 2 and 3, in an embodiment, the jacking device 15 may use a jack, the jack is placed on the bottom surface of the jacking chamber 12, and a hydraulic lifting rod of the jack is lifted to abut on the top surface of the jacking chamber 12. In order to improve the stability of the jacking device 15 during use, in another embodiment, a steel plate is added on each of the top surface and the bottom surface of the jacking device 15 to increase the contact area between the steel plate and the top surface and the bottom surface of the jacking chamber 12, so as to reduce the possibility of sliding and slipping during jacking. In another embodiment, the steel plates additionally arranged on the top and bottom surfaces of the jacking equipment 15 are connected to the top and bottom surfaces of the jacking chamber 12 by using anchor bolts, so that the possibility of sliding and slipping during jacking is further reduced.
Referring to fig. 2 and 3, in the jacking process of the jacking device 15, after the pier 11 on the top surface of the jacking device 15 is partially inclined, the direction of the pressure applied to the jacking device 15 is also changed, and at this time, a bending moment exists in the jacking device 15, which may bend the jacking device 15 to cause damage and incapability of use, on one hand, and may cause a potential risk of disengaging the jacking device 15 from the jacking chamber 12, on the other hand. Therefore, in an embodiment, a supporting structure 20 is additionally installed in the jacking chamber 12, and the supporting structure 20 can be abutted against the jacking equipment 15 to apply a pushing force opposite to the deformation direction of the jacking equipment, so that the jacking equipment can stably work.
In one embodiment, the supporting structure 20 is made of steel sections such as channel steel and i-steel, two ends of the supporting structure are fixed on the pier 11 by anchor bolts, the middle part of the supporting structure is supported against the jacking equipment 15, and when the distance between the two is large, a section of steel section can be additionally arranged on the supporting structure to support the supporting structure against the jacking equipment 15.
S103, a cut hole 13 is formed in the pier 11 as the pivot 19 when the pier 11 is tilted. This step serves to reserve an installation space for subsequent cutting because, if the cutting is performed from the outside to the inside, the bridge piers 11 on both sides of the cutting seam 14 clamp the cutting equipment after the cutting is performed to a designated position, so that the cutting equipment cannot be detached from the bridge piers 11.
In one embodiment, the cut hole 13 is horizontally disposed in order to ensure that the pier 11 can incline in a set direction, and if one end of the cut hole 13 is higher and the other end is lower, the pier 11 will incline to the lower side of the cut hole 13 in the process of falling, so that the pier 11 deviates from the set route.
In one embodiment, when the cut holes 13 are formed, the steel bars between the cut holes 13 and the set toppled sides of the bridge pier 11 need to be reserved, and it is mainly considered that the bridge pier 11 is made of reinforced concrete, the concrete is high in brittleness and extremely easy to crack when being subjected to external force, if all the steel bars are cut off, the concrete at the cut holes 13 in the jacking process can be rapidly cracked, and uncontrollable dangerous factors such as large-amplitude shaking or relative slippage can be caused.
And S104, cutting the pier 11 by taking the cut hole 13 as a reference, and dividing the jacking chamber 12 into two parts by a cut seam 14 formed in the cutting process. In the step, the cutting equipment extends into the cutting hole 13 and then moves towards the direction close to the jacking chamber 12, a cutting seam 14 is formed in the moving process of the cutting equipment, the cutting seam 14 divides the jacking chamber 12 into two parts, so that in the jacking process of the jacking equipment 15, the part of the pier 11 above the jacking chamber 12 can be inclined from the cutting seam 14 and finally poured into a set occupied area.
In one embodiment, as the cutting process proceeds, a wedge needs to be inserted into the formed cutting slit 14 to maintain the width of the cutting slit 14, so as to avoid the situation that the cutting device cannot move after being clamped.
And S105, jacking the pier 11 by using the jacking equipment 15, and enabling the part of the pier 11 above the jacking equipment 15 to incline until the pier falls down. In this step, the worker controls the jacking device 15 to jack the pier 11 until the pier is dumped into the set occupied area. In the jacking process, a worker is always positioned on one side of the pier 11 with the jacking chamber 12, and the pier 11 is required to quickly squat down and be close to the rest part of the pier 11 on the ground 17 as much as possible in the toppling process, so that flying stones generated in the process of collision between the pier 11 and the ground 17 are prevented from smashing.
Referring to fig. 4, jacking in-process manual operation's is slow and discontinuous, the speed of pier 11 slope this moment is also uncontrollable, frequently open and stop the in-process, pier 11 appears rocking very easily, can lead to pier 11 unstability on the one hand, there is the risk of empting in advance, pier 11 that on the other hand rocked can lead to jacking equipment 15's atress unstable, the problem of damage appears easily, therefore in an embodiment, along with going on of jacking process, need use wedge cushion 22 to fill in cutting seam 14, and along with going on of jacking process and continuously impel, utilize wedge cushion 22 to support inclined pier 11, bear the counter-acting force of pier 11 to jacking equipment 15 simultaneously, avoid jacking equipment 15 to be crushed.
Referring to fig. 2, in order to reduce the negative influence of the pier 11 during the tilting process, it is necessary to draw a contour line 21 of the pier 11 in contact with the ground 17 on the ground 17 in the tilting direction according to the shape of the pier 11, and then to clear the occupied area of the pier 11 during the tilting process according to the contour line 21. The area enclosed by the contour line 21 is larger than the pier 11, so that the pier 11 can completely fall into the area, and then people, equipment, materials and the like in the contour line 21 are completely evacuated. In order to further improve the safety of the pier 11 during the tilting, it is necessary to provide guard lines 30m laterally behind the pier 11 in the tilting direction and 100m laterally outside the pier 11 at the tilt sides, and during the construction, no other person than the staff and the necessary managers must enter the guard area, and no other person must enter the guard lines when the pier 11 is ready to tilt.
Referring to fig. 5, in order to reduce the influence of the flying dust and the flying stones generated by the pier 11 on the surrounding environment during the collision with the ground 17, in an embodiment, a foundation pit 16 is dug according to the shape and the external dimension of the pier 11 in the cleaned occupied area, so that the pier 11 can directly fall into the foundation pit 16 during the dumping process, and the foundation pit 16 can intercept a part of the flying dust and the flying stones to reduce the influence on the surrounding environment. In another embodiment, a water spraying pipe can be additionally arranged around the foundation pit 16, and water spraying is started when the pier 11 falls into the foundation pit 16 to form a water wall, so that the dust raising amount is further reduced.
In one embodiment, the soil on the bottom of the foundation pit 16 may be loosened so that during contact between the pier 11 and the bottom of the foundation pit 16, the portion of the soil is quickly deformed to absorb energy generated during impact and reduce the severity of the impact.
Referring to fig. 6, in another embodiment, a pad 18 may be laid on the bottom surface of the pit 16, and the pad 18 may also absorb energy generated during the impact and reduce the severity of the impact. The mat 18 may be made of rubber tires and laid by throwing a sufficient amount of rubber tires onto the bottom surface of the pit 16 and then tying the adjacent tires together with iron wires so that they can be integrated.
In the cutting process of the bridge pier 11, there are potential risks of toppling and relative sliding, and in order to ensure safety in the construction process, in an embodiment, before cutting, the bridge pier 11 needs to be reinforced, so that the bridge pier 11 is prevented from inclining or toppling towards the cutting direction. The concrete reinforcing modes include steel wire rope reinforcement, support reinforcement and the like.
Referring to fig. 7, the concrete way of reinforcing the steel wire rope is as follows: the two ends of the steel wire rope are respectively fixed on the pier 11 needing to be dismantled and the pier 11 beside the steel wire rope, if no position capable of being fixed is arranged beside the pier 11, a pile foundation can be added on the ground 17, and then the other end of the steel wire rope is tied on the pile foundation. Meanwhile, in order to avoid looseness of the steel wire rope, a manual hoist or an electric hoist can be additionally arranged on the steel wire rope, so that when the tension on the steel wire rope is reduced or loosened, the steel wire rope can be immediately tensioned through the manual hoist or the electric hoist.
Referring to fig. 8, the concrete manner of supporting and reinforcing is as follows: the pier 11 is supported by using section steel such as channel steel, I-shaped steel and the like, when in use, two ends of the section steel are respectively propped against the ground 17 and the pier 11, and if necessary, the section steel can be fixed by using an anchor bolt.
Referring to fig. 4, in an embodiment, before jacking the pier 11, a rotating shaft 19 is placed in the cut hole 13 to prevent the cut hole 13 from deforming during jacking. The rotating shaft 19 is made of iron bar materials, and the function of the rotating shaft is mainly to keep the integrity of the cutting hole 13 in the jacking process, so that the dangerous situations that the bridge pier 11 slides and shakes at the cutting hole 13 are avoided.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. A construction method for dismantling piers is characterized by comprising the following steps:
drawing out a jacking chamber on the non-toppling side of the bridge pier;
installing jacking equipment into a jacking chamber;
manufacturing a cutting hole on the pier to be used as a rotating shaft when the pier topples;
cutting the bridge pier by taking the cutting hole as a reference, and dividing the jacking chamber into two parts by a cutting seam formed in the cutting process;
and jacking the pier by using jacking equipment, so that the part of the pier, which is positioned above the jacking equipment, is inclined until the part is inclined.
2. The construction method for demolishing a pier according to claim 1, wherein: before jacking the pier, the contour line of the pier is released in the site on the side where the pier topples, and then the occupied area when the pier topples is cleared according to the contour line.
3. The construction method for demolishing a pier according to claim 2, wherein: digging a foundation pit in the occupied area, so that the bridge pier can fall into the foundation pit when toppling over.
4. The construction method for demolishing a pier according to claim 3, wherein: and digging soil at the bottom of the foundation pit loose.
5. The construction method for demolishing a pier according to claim 3 or 4, wherein: and laying a cushion layer on the bottom surface of the foundation pit.
6. The construction method for demolishing a pier according to claim 1, wherein: before the pier is cut, the pier is reinforced, so that the pier is prevented from inclining or toppling.
7. The construction method for demolishing a pier according to claim 1, wherein: when the cutting holes are manufactured on the bridge pier, the steel bars between the cutting holes and the toppling sides of the bridge pier are reserved.
8. The construction method for demolishing a pier according to claim 1, wherein: before jacking the pier, a rotating shaft is placed in the cutting hole to prevent the cutting hole from deforming in the jacking process.
9. The construction method for demolishing a pier according to claim 1, wherein: the cutting holes are horizontally arranged.
10. The construction method for demolishing a pier according to claim 1, wherein: after the jacking equipment is installed in the jacking chamber, a supporting structure is installed in the jacking chamber, and the stability of the jacking equipment is guaranteed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911026361.2A CN110725220A (en) | 2019-10-26 | 2019-10-26 | Construction method for dismantling pier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911026361.2A CN110725220A (en) | 2019-10-26 | 2019-10-26 | Construction method for dismantling pier |
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| CN110725220A true CN110725220A (en) | 2020-01-24 |
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| CN201911026361.2A Pending CN110725220A (en) | 2019-10-26 | 2019-10-26 | Construction method for dismantling pier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855654A (en) * | 2022-06-27 | 2022-08-05 | 四川路桥桥梁工程有限责任公司 | Stable inclined pier construction method without interrupting traffic operation |
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| KR20040049354A (en) * | 2002-12-03 | 2004-06-12 | 노윤근 | Prestressed preflextion H-beam and method for building a T-shaped bridge pier using the H-beam |
| CN106088098A (en) * | 2016-06-15 | 2016-11-09 | 龙元建设集团股份有限公司 | Supporting removal construction method |
| CN107217605A (en) * | 2016-03-21 | 2017-09-29 | 浙江大学 | A kind of continuous beam Demolition Construction method |
| CN108411803A (en) * | 2018-03-13 | 2018-08-17 | 北京怀仁前景工程技术有限公司 | Bridge pier integrally pushes over method |
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2019
- 2019-10-26 CN CN201911026361.2A patent/CN110725220A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040049354A (en) * | 2002-12-03 | 2004-06-12 | 노윤근 | Prestressed preflextion H-beam and method for building a T-shaped bridge pier using the H-beam |
| CN107217605A (en) * | 2016-03-21 | 2017-09-29 | 浙江大学 | A kind of continuous beam Demolition Construction method |
| CN106088098A (en) * | 2016-06-15 | 2016-11-09 | 龙元建设集团股份有限公司 | Supporting removal construction method |
| CN108411803A (en) * | 2018-03-13 | 2018-08-17 | 北京怀仁前景工程技术有限公司 | Bridge pier integrally pushes over method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855654A (en) * | 2022-06-27 | 2022-08-05 | 四川路桥桥梁工程有限责任公司 | Stable inclined pier construction method without interrupting traffic operation |
| CN114855654B (en) * | 2022-06-27 | 2024-02-23 | 四川路桥桥梁工程有限责任公司 | Stable inclined pier construction method without interrupting traffic operation |
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