CN113235469A - Sectional blasting demolition method for large bridge - Google Patents
Sectional blasting demolition method for large bridge Download PDFInfo
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- CN113235469A CN113235469A CN202110567230.6A CN202110567230A CN113235469A CN 113235469 A CN113235469 A CN 113235469A CN 202110567230 A CN202110567230 A CN 202110567230A CN 113235469 A CN113235469 A CN 113235469A
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- Prior art keywords
- blasting
- bridge
- bridge deck
- pier
- deck
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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 sectional blasting demolition method for a large bridge, which comprises the following steps: 1) dismantling auxiliary facilities of the bridge deck; 2) designing a plurality of groups of parallel blasting points on the bridge deck, and erecting a supporting platform in the middle of a blasting section; 3) drilling a bridge deck blasting point, and sequentially filling a water drum, an explosive, a water drum and a static blasting agent into the hole; 4) blasting and dismantling the bridge deck, and blasting the bridge deck into a plurality of sections; 5) conveying each section of the bridge deck to the bridge head or the bridge tail, and transporting away by using a heavy-duty vehicle; 6) dismantling the supporting platform and a platform at the upper part of the pier, building a reinforcement cage outside the pier, and wrapping a steel wire mesh outside the reinforcement cage; 7) drilling a hole from the top of the pier, and then sequentially filling a water drum, an explosive, a water drum and a static blasting agent into the hole; 8) and after blasting once, hanging out the broken bridge pier, transporting away by a reloading vehicle, and blasting for multiple times until the whole bridge pier is dismantled. Compared with the traditional cutting and dismantling mode, the invention has the advantages of high efficiency, labor saving and low construction cost.
Description
Technical Field
The invention relates to the technical field of bridge demolition, in particular to a sectional blasting demolition method for a large bridge.
Background
With the rapid development of urban construction and transformation in China, bridges constructed in early stage cannot meet the rapid development of current traffic in aspects of traffic function, load grade, safe operation and the like. At present, the rapid development of economy and society and the continuous improvement of comprehensive strength in China further accelerate the urbanization step in China. However, some buildings and structures existing in the early days cannot meet the existing social requirements in terms of use function, load grade and operation safety, and the maintenance and reinforcement cost is too high, so that the buildings and the structures face the eliminated fate, and in such a background, the blasting demolition technology is brought into force.
In recent years, the technology of blasting demolition is utilized more and more in the actual demolition process, so that the requirements on the accuracy and the precision of demolition engineering are higher and higher, meanwhile, the enhancement of people on the safety and environmental awareness leads to the increase of demolition difficulty coefficients, so that the traditional blasting demolition mode cannot meet the current development requirements, the theoretical research of blasting demolition in China is relatively backward, safety accidents caused by blasting demolition occur sometimes, casualties are caused, equipment is damaged, and other economic losses.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a sectional blasting demolition method for a large bridge, which combines drilling, water pressure and static blasting together to carry out stable sectional blasting and demolition in sections.
In order to achieve the purpose, the invention is realized by the following technical scheme: a sectional blasting demolition method for a large bridge comprises the following steps:
(1) dismantling auxiliary facilities of the bridge deck;
(2) designing a plurality of groups of parallel blasting points on the bridge deck, and erecting a supporting platform in the middle of a blasting section;
(3) drilling a bridge deck blasting point, and sequentially filling a water drum, an explosive, a water drum and a static blasting agent into the hole;
(4) blasting and dismantling the bridge deck, and blasting the bridge deck into a plurality of sections;
(5) conveying each section of the bridge deck to the bridge head or the bridge tail, and transporting away by using a heavy-duty vehicle;
(6) dismantling the supporting platform and the platform at the upper part of the pier, and erecting a blasting protective net outside the pier;
(7) drilling a hole from the top of the pier, and then sequentially filling a water drum, an explosive, a water drum and a static blasting agent into the hole;
(8) and after blasting once, hanging out the broken bridge pier, transporting away by a reloading vehicle, and blasting for multiple times until the whole bridge pier is dismantled.
The working principle of the technical scheme is that the blasting is carried out in a small range in the bridge deck and the bridge piers by combining three blasting modes of drilling blasting, water pressure blasting and static blasting. The purpose of sequentially filling the water drum, the explosive, the water drum and the static explosive in the blasting point drill hole in the bridge deck blasting process is that the static explosive on the uppermost layer can seal the opening of the drill hole and increase the pressure at the blasting hole, the explosive in the middle part is wrapped by the water drum from top to bottom in the blasting process, so that the blasting power is basically transmitted transversely and downwards in the whole blasting process, and the phenomena of splashing of a large amount of broken stones and the like cannot occur due to the sealed static explosive at the hole opening. However, after the explosive inside explodes, the water is burst, and the water pressure leaks to the periphery and the lower part, so that the bridge deck structure can be damaged well. Similarly, after blasting is finished, because the stress of the static blasting agent at the drill hole disappears suddenly, the bridge deck cracks along the hole filled with the static blasting agent, and the bridge body is broken by blasting. The specific implementation process needs to calculate the blasting points according to the bridge material and the bearing relation, and the blasting can not generate strong solid with destructive power such as boulders, so that in the bridge deck blasting process, only personnel need to be far away from the blasting bridge body, and extra protective measures are not needed.
When the bridge deck is exploded into the multistage, because every blasting section bridge deck is provided with supporting platform, consequently, cracked multistage bridge deck can not directly fall, can utilize crane or wide range hoist engine to hang away cracked bridge deck leisurely.
The demolition process of pier, because be at pier upper portion drilling, because the reason of static blasting agent equally, the rubble can not appear in its surface, but because be horizontal blasting in the pier, consequently has the risk that the rubble bounces, consequently need set up the blasting protection network in pier outside to guarantee blasting safety.
In order to better implement the method of the present invention, further, in step (1), the auxiliary devices for dismantling the bridge deck include a street lamp holder, a guardrail and a cable.
In order to better implement the method of the present invention, further, in the step (2), the support platform is a support platform built for a steel scaffold.
In order to better realize the method of the invention, in the step (3), the depth of the drilled hole is 2/4-3/4 of the thickness of the bridge deck, and the diameter of the drilled hole is 10-15 mm.
In order to better realize the method of the invention, the static blasting agent is further prepared by adding water into silicate and calcium oxide according to the mass ratio of 1:1 and mixing and stirring.
In order to better implement the method of the present invention, further, the conveying process of the bridge deck in the step (5) is as follows: and a walking type ejector is arranged on the erected supporting platform, and the bridge deck is pushed and translated towards the bridge head or the bridge tail to be separated from the support of the supporting platform, and is conveyed to one side of the bridge head or the bridge tail.
In order to better implement the method of the present invention, further, the conveying process of the bridge deck in the step (5) is as follows: and a guide roller is arranged on the erected supporting platform, and a winch is arranged at the bridge head or the bridge tail to drag the bridge deck.
In order to better implement the method of the present invention, further, the blasting protection net in the step (6) is composed of a steel reinforcement cage covering the entire pier and a steel wire mesh covering the steel reinforcement cage.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the invention, three blasting modes of drilling blasting, hydraulic blasting and static blasting are combined, so that blasting is carried out in a small range in a bridge deck and a bridge pier, and because the water drum rotates the static blasting agent on the surface of the hole, no broken slag with high destructiveness, such as broken stone, is generated on the surface, so that the method is relatively safe and has high demolition efficiency;
(2) according to the invention, through the blasting mode, the length of the bridge deck blasting section and the length of the pier blasting section can be adjusted according to the length, the width and the weight of the bridge, so that the bridge can be suitable for the blasting processes of various bridge bodies, and the application range is wide;
(3) compared with the traditional mode of cutting the bridge floor and the bridge piers, the invention has the advantages of high dismantling efficiency, labor saving, lower construction cost, small overall damage to the bridge body, repeated recycling of the recycled bridge floor and bridge piers and improvement of the utilization rate of resources.
Detailed Description
The present invention will be described in further detail with reference to the following examples for the purpose of making clear the objects, process conditions and advantages of the present invention, but the embodiments of the present invention are not limited thereto, and various substitutions and modifications can be made according to the common technical knowledge and the conventional means in the art without departing from the technical idea of the present invention described above, and the specific examples described herein are only for explaining the present invention and are not intended to limit the present invention.
Example 1:
the embodiment provides a sectional blasting demolition method for a large bridge, which comprises the following steps:
(1) dismantling auxiliary facilities of the bridge deck;
(2) designing a plurality of groups of parallel blasting points on the bridge deck, and erecting a supporting platform in the middle of a blasting section;
(3) drilling a bridge deck blasting point, and sequentially filling a water drum, an explosive, a water drum and a static blasting agent into the hole;
(4) blasting and dismantling the bridge deck, and blasting the bridge deck into a plurality of sections;
(5) conveying each section of the bridge deck to the bridge head or the bridge tail, and transporting away by using a heavy-duty vehicle;
(6) dismantling the supporting platform and the platform at the upper part of the pier, and erecting a blasting protective net outside the pier;
(7) drilling a hole from the top of the pier, and then sequentially filling a water drum, an explosive, a water drum and a static blasting agent into the hole;
(8) and after blasting once, hanging out the broken bridge pier, transporting away by a reloading vehicle, and blasting for multiple times until the whole bridge pier is dismantled.
By combining three blasting modes of drilling blasting, hydraulic blasting and static blasting, blasting is carried out in a small range in the bridge deck and the bridge piers. The purpose of sequentially filling the water drum, the explosive, the water drum and the static explosive in the blasting point drill hole in the bridge deck blasting process is that the static explosive on the uppermost layer can seal the opening of the drill hole and increase the pressure at the blasting hole, the explosive in the middle part is wrapped by the water drum from top to bottom in the blasting process, so that the blasting power is basically transmitted transversely and downwards in the whole blasting process, and the phenomena of splashing of a large amount of broken stones and the like cannot occur due to the sealed static explosive at the hole opening. However, after the explosive inside explodes, the water is burst, and the water pressure leaks to the periphery and the lower part, so that the bridge deck structure can be damaged well. Similarly, after blasting is finished, because the stress of the static blasting agent at the drill hole disappears suddenly, the bridge deck cracks along the hole filled with the static blasting agent, and the bridge body is broken by blasting. The specific implementation process needs to calculate the blasting points according to the bridge material and the bearing relation, and the blasting can not generate strong solid with destructive power such as boulders, so that in the bridge deck blasting process, only personnel need to be far away from the blasting bridge body, and extra protective measures are not needed.
When the bridge deck is exploded into the multistage, because every blasting section bridge deck is provided with supporting platform, consequently, cracked multistage bridge deck can not directly fall, can utilize crane or wide range hoist engine to hang away cracked bridge deck leisurely.
The demolition process of pier, because be at pier upper portion drilling, because the reason of static blasting agent equally, the rubble can not appear in its surface, but because be horizontal blasting in the pier, consequently has the risk that the rubble bounces, consequently need set up the blasting protection network in pier outside to guarantee blasting safety.
Example 2:
this embodiment is further defined on the basis of the above embodiment, in step (1), the auxiliary device for dismantling the bridge deck includes a street lamp holder, a guardrail, and a cable. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 3:
the embodiment is further limited on the basis of the above embodiment, in the step (2), the support platform is a support platform built by a steel bar scaffold. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 4:
in the embodiment, on the basis of the above embodiment, the depth of the drilled hole in the step (3) is 2/4-3/4 of the thickness of the bridge deck, and the diameter of the drilled hole is 10-15 mm. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 5:
in this embodiment, on the basis of the above embodiments, the static blasting agent is formed by adding water to mix and stir silicate and calcium oxide according to a mass ratio of 1: 1. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 6:
this embodiment is further defined on the basis of the above embodiment, and the conveying process of the bridge deck in step (5) is as follows: and a walking type ejector is arranged on the erected supporting platform, and the bridge deck is pushed and translated towards the bridge head or the bridge tail to be separated from the support of the supporting platform, and is conveyed to one side of the bridge head or the bridge tail. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 7:
this embodiment is further defined on the basis of the above embodiment, and the conveying process of the bridge deck in step (5) is as follows: and a guide roller is arranged on the erected supporting platform, and a winch is arranged at the bridge head or the bridge tail to drag the bridge deck. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
Example 8:
in this embodiment, on the basis of the above embodiment, it is further defined that in the step (6), the blasting protection net is composed of a steel reinforcement cage covering the entire pier and a steel wire mesh covering the steel reinforcement cage. Other parts of this embodiment are the same as those of the above embodiment, and are not described again.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A method for demolishing a large bridge by sectional blasting is characterized by comprising the following steps:
(1) dismantling auxiliary facilities of the bridge deck;
(2) designing a plurality of groups of parallel blasting points on the bridge deck, and erecting a supporting platform in the middle of a blasting section;
(3) drilling a bridge deck blasting point, and sequentially filling a water drum, an explosive, a water drum and a static blasting agent into the hole;
(4) blasting and dismantling the bridge deck, and blasting the bridge deck into a plurality of sections;
(5) conveying each section of the bridge deck to the bridge head or the bridge tail, and transporting away by using a heavy-duty vehicle;
(6) dismantling the supporting platform and the platform at the upper part of the pier, and erecting a blasting protective net outside the pier;
(7) drilling a hole from the top of the pier, and then sequentially filling a water drum, an explosive, a water drum and a static blasting agent into the hole;
(8) and after blasting once, hanging out the broken bridge pier, transporting away by a reloading vehicle, and blasting for multiple times until the whole bridge pier is dismantled.
2. The method for demolishing a large bridge by means of segmental blasting according to claim 1, wherein in the step (1), the auxiliary devices for demolishing the bridge deck comprise street lamp holders, guardrails and cables.
3. The method for demolishing by blasting a large bridge according to claim 2, wherein in the step (2), the supporting platform is a supporting platform constructed by a steel scaffold.
4. The method for demolishing by blasting a large bridge according to claim 3, wherein in the step (3), the depth of the drilled hole is 2/4-3/4 of the thickness of the bridge deck, and the diameter of the drilled hole is 10-15 mm.
5. The method for demolishing by staged blasting of a large bridge according to claim 4, wherein the static blasting agent is prepared by adding water to mix and stir silicate and calcium oxide in a mass ratio of 1: 1.
6. The method for demolishing by blasting a large bridge according to claim 4, wherein the transportation of the bridge deck in the step (5) comprises: and a walking type ejector is arranged on the erected supporting platform, and the bridge deck is pushed and translated towards the bridge head or the bridge tail to be separated from the support of the supporting platform, and is conveyed to one side of the bridge head or the bridge tail.
7. The method for demolishing by blasting a large bridge according to claim 4, wherein the transportation of the bridge deck in the step (5) comprises: and a guide roller is arranged on the erected supporting platform, and a winch is arranged at the bridge head or the bridge tail to drag the bridge deck.
8. The method for demolishing by blasting a large bridge according to claim 5, wherein the blasting protection net in the step (6) is composed of a reinforcement cage covering the entire pier and a steel wire mesh covering the reinforcement cage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110567230.6A CN113235469A (en) | 2021-05-24 | 2021-05-24 | Sectional blasting demolition method for large bridge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110567230.6A CN113235469A (en) | 2021-05-24 | 2021-05-24 | Sectional blasting demolition method for large bridge |
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| CN113235469A true CN113235469A (en) | 2021-08-10 |
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| CN202110567230.6A Pending CN113235469A (en) | 2021-05-24 | 2021-05-24 | Sectional blasting demolition method for large bridge |
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2021
- 2021-05-24 CN CN202110567230.6A patent/CN113235469A/en active Pending
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