CN115058989A - Construction method for rapidly dismounting single-column-pier single-box-chamber box girder bridge - Google Patents
Construction method for rapidly dismounting single-column-pier single-box-chamber box girder bridge Download PDFInfo
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- CN115058989A CN115058989A CN202210799282.0A CN202210799282A CN115058989A CN 115058989 A CN115058989 A CN 115058989A CN 202210799282 A CN202210799282 A CN 202210799282A CN 115058989 A CN115058989 A CN 115058989A
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- 238000010276 construction Methods 0.000 title claims abstract description 44
- 238000005422 blasting Methods 0.000 claims abstract description 47
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 239000002360 explosive Substances 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000009826 distribution Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000003721 gunpowder Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/56—Reuse, recycling or recovery technologies of vehicles
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to the field of box girder bridges, in particular to a construction method for quickly dismantling a single-column pier single-box-chamber box girder bridge, which comprises the following steps: blasting demolition construction is carried out on the single-column pier single-box-chamber box girder bridge; the invention discloses a construction method for rapidly dismantling a single-column pier single-box-chamber box girder bridge; the invention realizes blasting demolition of the box girder bridge by a blasting method; the residues formed after the box girder bridge is blasted are reduced as small as possible, so that the subsequent crushing and cleaning of the box girder bridge are facilitated; in addition, the single-column pier dismantling efficiency of the bridge can be accelerated by arranging the positions and the structures of the plurality of filling holes; in the whole process, only the blasting and crushing clearing stages need to be closed, so that the influence of the bridge dismantling process on the society can be reduced.
Description
Technical Field
The invention relates to the field of box girder bridges, in particular to a construction method for quickly dismantling a single-column pier single-box chamber box girder bridge.
Background
With the continuous construction of the infrastructure in China, the single-column pier cast-in-place box girder bridge is gradually eliminated in a high-speed bridge crossing mode, the existing bridge needs to be dismantled, but the dismantling work has the following problems: (1) the problem of symmetrical and synchronous release of prestress in the original continuous box girder cannot be solved by adopting mechanical dismantling, and the beam body of the original continuous box girder has a safety risk of lateral overturning in the dismantling process; (2) the requirement on the off-line time of the highway is high, and long-time off-line is not allowed; (3) the welding position of the beam plate and the bridge pier of the bridge is not easy to cut, the beam plate is thick, the weight is too large, and the hoisting condition is not met.
In conclusion, in combination with social and economic benefits, it is particularly important to research and invent a construction method for quickly dismantling a single-column pier single-box chamber cast-in-place box girder bridge.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a construction method for quickly dismantling a single-column pier single-box-chamber box girder bridge.
In order to achieve the purpose, the invention adopts the technical scheme that:
a construction method for quickly dismantling a single-column pier single-box chamber box girder bridge comprises the following steps:
and blasting and dismantling the single-column pier single-box chamber box girder bridge.
The blasting demolition construction comprises the following steps:
step 1: a construction notch is formed in a bridge floor at the top of a box girder in the box girder bridge; the construction notch is communicated with the interior of the box girder;
and 2, step: forming internal filling holes in the corresponding box girders through each construction notch; an upper filling hole is formed in the bridge floor at the top of the box girder; side face filling holes are formed in edge guardrails of the box girder bridge;
and step 3: arranging a lower filling hole on a pier of the box girder bridge;
and 4, step 4: after the step 3 is finished, filling explosives in the upper filling hole, the inner filling hole and the side filling hole respectively;
and 5: after the step 4 is finished, detonating explosives according to design requirements to demolish the box girder bridge; after blasting is finished, carrying out residue cleaning treatment on the box girder bridge after inspection is finished;
step 6: and (5) after the step 5 is finished, finishing the dismantling operation of one box girder bridge, and repeating the steps 1-5 if other box girder bridges need to be dismantled repeatedly.
When drilling the bridge deck at the top of the box girder, a drill bit is required to feed along the direction vertical to the bridge deck at the top of the box girder; the pier drilling also requires the drill bit to feed along the direction vertical to the center line of the pier.
The depth of an upper filling hole formed in the middle area of the bridge deck at the top of the box girder is smaller than that of an upper filling hole formed in the two side areas of the bridge deck at the top of the box girder.
A plurality of side face filling holes are formed in the edge guardrail and are distributed in a staggered mode; each side surface filling hole is distributed in a plum blossom shape.
The upper filling holes are all rectangular holes; each upper filling hole is distributed in a rectangular shape.
A plurality of lower filling holes are formed in the bridge pier; the lower filling holes are distributed in a staggered mode, and the lower filling holes are distributed in a plum blossom shape.
The lower filling hole on the pier is positioned in the middle area of the pier; blank sections are reserved at the upper end and the lower end of the pier.
The side filling holes are obliquely arranged.
The internal filling holes comprise bottom filling holes arranged at the bottom of the box girder and edge filling holes arranged on the side wall of the box girder; the depth of the edge filling hole is greater than that of the bottom filling hole; the side part filling holes are obliquely arranged.
The invention has the advantages that:
the invention discloses a construction method for rapidly dismantling a single-column pier single-box chamber box girder bridge; the invention realizes blasting demolition of the box girder bridge by a blasting method; the residues formed after the box girder bridge is blasted are reduced as small as possible, so that the subsequent crushing and cleaning of the box girder bridge are facilitated; in addition, the single-column pier dismantling efficiency of the bridge can be accelerated by arranging the positions and the structures of the plurality of filling holes; in the whole process, only the blasting and crushing clearing stages need to be closed, so that the influence of the bridge dismantling process on the society can be reduced.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a top plan view of a top deck of a box girder according to the present invention.
FIG. 2 is a cross-sectional view of the present invention with an upper skylight aperture.
FIG. 3 is a cross-sectional view of the present invention with internal fill holes.
FIG. 4 is a front view of the pier of the present invention with a lower filling hole.
The labels in the above figures are:
1. pier, 2, box girder, 3, box girder top bridge floor, 4, edge guardrail.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
A construction method for rapidly dismantling a single-column pier single-box chamber box girder 2 bridge comprises the following steps: blasting demolition construction is carried out on the single-column pier single-box chamber box girder bridge 2-1; the invention discloses a construction method for quickly dismantling a single-column pier single-box chamber box girder bridge 2-1; the invention realizes blasting demolition of the box girder bridge 2-1 by a blasting method; the residues formed after the box girder bridge 2-1 is blasted are reduced as small as possible, and the subsequent crushing and clearing of the box girder bridge 2-1 are facilitated.
Further, the blasting demolition construction in the invention comprises the following steps:
step 1: a construction notch 3-1 is formed in a bridge deck 3 at the top of a box girder in the box girder bridge 2-1; the construction notch 3-1 is communicated with the interior of the box girder 2;
step 2: an internal filling hole 22 is formed in the corresponding box girder 2 through each construction notch 3-1; an upper filling hole 31 is formed in the bridge deck 3 at the top of the box girder; a side face filling hole 41 is formed in the edge guardrail 4 of the box girder bridge 2-1;
and step 3: a lower filling hole 11 is formed in a pier 1 of the box girder bridge 2-1;
and 4, step 4: after completion of step 3, filling explosives in the upper filling hole 31, the inner filling hole 22, and the side filling hole 41, respectively;
and 5: after the step 4 is finished, detonating explosives according to design requirements to demolish the box girder bridge 2-1; after blasting is finished, carrying out residue cleaning treatment on the box girder bridge 2-1 after inspection is finished;
step 6: and (5) after the step (5) is finished, completing the dismantling operation of one box girder bridge 2-1, and repeating the steps 1-5 if other box girder bridges 2-1 need to be dismantled repeatedly.
According to the invention, through the disclosure of the blasting demolition construction steps, the blasting demolition of the box girder bridge 2-1 can be facilitated, and the granularity of residues after blasting of the box girder bridge 2-1 can be reduced.
In addition, in step 2 of the present invention, it is required to open the internal filling hole 22 first; then, an upper filling hole 31 is formed in the bridge deck 3 at the top of the box girder, and then a side filling hole 41 is formed in the edge guardrail 4 of the box girder bridge 2-1; here, the construction sequence is as above, and it is to reduce the damage of the slotting to the constructor, because if the upper filling hole 31 is opened first and then the inner filling hole is opened, the dust formed by opening the upper filling hole 31 will affect the slotting personnel who follow the inner filling hole 22, and cause the slotting personnel to absorb too much dust, which will affect the health.
Further, when the box girder top bridge deck 3 is drilled, the drill bit is required to feed along the direction vertical to the box girder top bridge deck 3; in addition, in the invention, the upper filling holes 31, the lower filling holes 11, the bottom filling holes 221 and other filling holes are mainly used for loading gunpowder, namely loading blasting gun bodies, and the filling holes are called as blast holes when in actual use; the blast holes are arranged by adopting the operation mode, so that the drilling is easy, the drilling accuracy is high, the inside and outside sizes of the blast hole volume are relatively consistent, and the inside and outside minimum resistance lines of the adjacent blast holes are relatively consistent, so that the lump size of the blasted ore is uniform, the blast is not thrown too far, and the blasting pile is concentrated near the working surface; is beneficial to rock loading.
Further, in the invention, the depth of an upper filling hole 31 formed in the middle area of the top bridge deck 3 of the box girder is smaller than the depth of upper filling holes 31 formed in the two side areas of the top bridge deck 3 of the box girder; in blasting demolition, because the thickness of the upper part of the middle part of the bridge deck is smaller than that of the upper part of the edge of the bridge deck, in order to achieve the same blasting effect, the depth of an upper filling hole 31 in the middle part of the bridge deck is smaller than that of the upper filling hole 31 in the edge of the bridge deck, so that the blasting energy of explosives filled in blasting holes is equal to the energy required for damaging media around the holes; and optimizing the blasting effect.
Furthermore, in the invention, a plurality of side filling holes 41 are arranged on the edge guardrail 4, and the side filling holes 41 are distributed in a staggered manner; each side surface filling hole 41 is distributed in a plum blossom shape; from the view of uniform energy distribution generated by blasting, the quincunx arrangement is more ideal, namely, the distribution mode is adopted, so that fewer flying stones can be generated on the guardrail at the blasting edge.
Further, in the present invention, the upper filling holes 31 are all rectangular holes; each upper filling hole 31 is distributed in a rectangular shape; in the invention, the construction preparation time is short, and in order to ensure that the blasting work is finished within the specified time, after the blasting effect and the preparation time are fully considered, the rectangular blast holes are arranged, so that the positioning is easier and more accurate, the moving times of a drilling machine are less, the construction preparation time is short, and the like, and therefore, the rectangular hole arrangement mode is selected.
Further, in the present invention, a plurality of lower filling holes 11 are provided in the pier 1; the lower filling holes 11 are distributed in a staggered mode, the lower filling holes 11 are distributed in a plum blossom shape, a plum blossom-shaped arrangement mode and a multi-hole and less-charging mode are adopted, so that the total charge is dispersed, the single-hole charge is micro-quantized, the crushing speed is more uniform by combining a multi-section differential blasting technology, and the blasting vibration and shock wave damage and the grounding vibration after the bridge collapses are smaller.
Further, in the present invention, the lower filling hole 11 of the pier 1 is located in the middle region of the pier 1; blank sections 12 are reserved at the upper end and the lower end of the pier 1; adopting an in-situ collapse design scheme by combining the surrounding construction environment; determining the position and height of the blasting notch by combining the instability principle; when the upper part and the lower part of the bridge are blasted and demolished simultaneously, the blank section 12 absorbs redundant energy in a blasting mode in the middle of the bridge pier 1, so that no flying stones are caused by the redundant energy and the bridge can only collapse in situ; if holes are formed in the upper end and the lower end of the pier 1, the energy generated by blasting is larger than the energy required by media around the holes to achieve the expected blasting effect, so that the media structure is damaged, and the redundant energy is converted into harmful effects such as air shock waves, scattered objects, earthquakes and the like, so that surrounding geology and buildings are affected.
Further, in the present invention, the side filling holes 41 are provided obliquely; due to the arrangement, the explosive is convenient to place, and the explosive is prevented from falling.
Further, in the present invention, the inner filling hole 22 includes a bottom filling hole 221 provided at the bottom of the box girder 2 and an edge filling hole 222 provided at the side wall of the box girder 2; the depth of the edge filling hole 222 is greater than the depth of the bottom filling hole 221; by the arrangement mode, the side wall of the box girder can be separated from the bottom of the box girder, and the situation that after blasting, the bottom of the box girder generates a large flying stone to influence the subsequent cleaning operation is avoided; in addition, in the present invention, the edge filling holes 222 are arranged obliquely; due to the arrangement, the explosive is convenient to place, and the explosive is prevented from falling.
In the specific implementation:
through 2-1 stress analysis to single-column pier single-box-chamber cast-in-place box girder bridge, the blasting construction network is summarized and optimized, prestress safety release to 2 girder plates of the cast-in-place box girder can be realized through blasting, synchronous dismantling can be realized for the single-column pier of the bridge, the construction progress is accelerated, and therefore the time saving cost is realized, and the economic benefit and the social benefit are improved.
The main implementation process comprises the following steps:
a plurality of construction notches 3-1 are cut on the bridge floor 3 at the top of the box girder so that an operator can conveniently enter the box girder 2; the bottom of the box girder 2 is conveniently and subsequently subjected to hole distribution and charging through the bridge floor, the blasting effect is enhanced, the slag removal time is reduced, and compared with the method that holes are distributed at the bottom of the box girder 2 at the bridge bottom, the time for setting up a support is saved;
in addition, the bridge deck drilling holes are drilled in a vertical mode, wherein the depth of the bridge deck drilling holes on two sides of the box girder 2 is 0.35m, plum blossom-shaped cloth holes are formed in two sides of the edge guardrail 4, and rectangular cloth holes are formed in the rest parts;
drilling a hole in the pier 1 in a vertical mode, reserving 1m of non-drilled holes at the upper part and the lower part respectively, and arranging the holes in a quincunx shape;
then blasting and crushing and clearing treatment are carried out as required.
The invention has the advantages that:
the design of blasting hole sites on the plane and the longitudinal surface of the single-box chamber cast-in-place box girder 2 is utilized to achieve the effects of enabling the box girder 2 to be as small as possible after blasting and facilitating crushing and clearing; the single column pier demolition efficiency of the bridge is accelerated by utilizing the blasting hole site design of the single column pier above the ground; in the whole process, only the blasting and crushing clearing stages need to be closed, so that the influence of the bridge dismantling process on the society can be reduced.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (10)
1. A construction method for rapidly dismantling a single-column pier single-box chamber box girder bridge is characterized by comprising the following steps:
and blasting and dismantling the single-column pier single-box-chamber box girder bridge.
2. The construction method for rapidly dismantling the single-pier single-box girder bridge according to claim 1,
the blasting demolition construction comprises the following steps:
step 1: a construction notch is formed in a bridge floor at the top of a box girder in the box girder bridge; the construction notch is communicated with the interior of the box girder;
step 2: forming internal filling holes in the corresponding box girders through each construction notch; an upper filling hole is formed in the bridge floor at the top of the box girder; side face filling holes are formed in edge guardrails of the box girder bridge;
and step 3: arranging lower filling holes on piers of the box girder bridge;
and 4, step 4: after the step 3 is finished, filling explosives in the upper filling hole, the inner filling hole and the side filling hole respectively;
and 5: after the step 4 is finished, detonating explosives according to design requirements to demolish the box girder bridge; after blasting is finished, carrying out residue cleaning treatment on the box girder bridge after inspection is finished;
step 6: and (5) after the step 5 is finished, finishing the dismantling operation of one box girder bridge, and repeating the steps 1-5 if other box girder bridges need to be dismantled repeatedly.
3. The construction method for rapidly dismantling the single-column-pier single-box-chamber box girder bridge according to claim 2, wherein when the box girder top deck is drilled, a drill bit is required to feed in a direction vertical to the box girder top deck; the pier drilling also requires that the drill bit is fed along the direction vertical to the center line of the pier.
4. The construction method for rapidly dismantling the single box girder bridge with single column piers according to claim 2, wherein the depth of the upper filling hole formed in the middle area of the top deck of the box girder is smaller than the depth of the upper filling hole formed in the two side areas of the top deck of the box girder.
5. The construction method for rapidly dismantling the single-column-pier single-box-chamber box girder bridge according to claim 2, wherein a plurality of side face filling holes are formed in the edge guardrail and are distributed in a staggered manner; each side surface filling hole is distributed in a plum blossom shape.
6. The construction method for rapidly dismantling the single-pier single-box-chamber box girder bridge according to claim 2, wherein the upper filling holes are all rectangular holes; each upper filling hole is distributed in a rectangular shape.
7. The construction method for rapidly dismantling the single-column-pier single-chamber box girder bridge according to claim 2, wherein a plurality of lower filling holes are formed in the pier; the lower filling holes are distributed in a staggered mode, and the lower filling holes are distributed in a plum blossom shape.
8. The construction method for rapidly dismantling the single-column-pier single-box-chamber box girder bridge according to claim 2, wherein a lower filling hole on the bridge pier is arranged in the middle area of the bridge pier; blank sections are reserved at the upper end and the lower end of the pier.
9. The construction method for rapidly dismantling the single-pier single-box girder bridge according to claim 5, wherein the side filling holes are obliquely arranged.
10. The construction method for rapidly dismantling the single-pier single-box girder bridge according to claim 2, wherein the internal filling holes comprise bottom filling holes formed in the bottom of the box girder and side filling holes formed in the side walls of the box girder; the depth of the edge filling hole is greater than that of the bottom filling hole; the edge filling holes are arranged obliquely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210799282.0A CN115058989A (en) | 2022-07-06 | 2022-07-06 | Construction method for rapidly dismounting single-column-pier single-box-chamber box girder bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210799282.0A CN115058989A (en) | 2022-07-06 | 2022-07-06 | Construction method for rapidly dismounting single-column-pier single-box-chamber box girder bridge |
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| Publication Number | Publication Date |
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| CN115058989A true CN115058989A (en) | 2022-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210799282.0A Pending CN115058989A (en) | 2022-07-06 | 2022-07-06 | Construction method for rapidly dismounting single-column-pier single-box-chamber box girder bridge |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105088979A (en) * | 2015-09-04 | 2015-11-25 | 贵州新联爆破工程集团有限公司 | Demolition blasting method for large bridge |
| JP2016121458A (en) * | 2014-12-24 | 2016-07-07 | カヤク・ジャパン株式会社 | Removal method of composite beam concrete |
-
2022
- 2022-07-06 CN CN202210799282.0A patent/CN115058989A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016121458A (en) * | 2014-12-24 | 2016-07-07 | カヤク・ジャパン株式会社 | Removal method of composite beam concrete |
| CN105088979A (en) * | 2015-09-04 | 2015-11-25 | 贵州新联爆破工程集团有限公司 | Demolition blasting method for large bridge |
Non-Patent Citations (2)
| Title |
|---|
| 池恩安等: "《爆破拆除工程案例分析》", 31 December 2015, pages: 161 - 162 * |
| 蒋文俊等: "复杂环境下分离式立交桥爆破拆除技术", 《山西建筑》, 31 October 2017 (2017-10-31), pages 86 - 87 * |
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