CN114134829A - Prestressed hollow slab beam bridge dismantling system and construction method - Google Patents
Prestressed hollow slab beam bridge dismantling system and construction method Download PDFInfo
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- CN114134829A CN114134829A CN202111643108.9A CN202111643108A CN114134829A CN 114134829 A CN114134829 A CN 114134829A CN 202111643108 A CN202111643108 A CN 202111643108A CN 114134829 A CN114134829 A CN 114134829A
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- hollow slab
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B15/00—Cleaning or keeping clear the surface of open water; Apparatus therefor
- E02B15/04—Devices for cleaning or keeping clear the surface of open water from oil or like floating materials by separating or removing these materials
- E02B15/06—Barriers therefor construed for applying processing agents or for collecting pollutants, e.g. absorbent
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/40—Protecting water resources
- Y02A20/402—River restoration
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Abstract
The invention provides a prestressed hollow slab girder bridge dismantling system and a construction method, wherein the prestressed hollow slab girder bridge dismantling system comprises a bracket bearing platform arranged at the upper part of a pier stud, a safety protection support arranged on a beam slab and the bracket bearing platform, an elevation control device arranged on an air pick, a dirt intercepting dam arranged at the downstream of a river channel and a construction platform system hooped on the pier stud. The system is demolishd to hollow slab beam bridge of prestressing force, and the construction sets up filth interception dam and safety protection support earlier, then carries out the guardrail in proper order and demolishs, and bridge deck pavement layer and expansion joint device are demolishd, and hollow slab demolishs, and bent cap and pier stud are demolishd, carry out the river course clearance at last. According to the invention, the beam slab is effectively prevented from being damaged in the old bridge dismantling process, the safety protection support and the support system of the construction platform are arranged on the original bridge pier column through the bracket bearing platform, and the problem of insufficient foundation bearing capacity is solved.
Description
Technical Field
The invention relates to the technical field of bridge dismantling engineering, in particular to a prestressed hollow slab beam bridge dismantling system and a construction method.
Background
The hollow slab is applied more in building and the construction of small-span bridge bridges, and compared with a solid slab with the same span, the hollow slab has the characteristics of light weight, low price, convenience in transportation and installation and the like. However, with the process of urbanization, more and more roads are rebuilt and expanded, and the demolition construction of the in-situ hollow slab girder bridge is involved.
The existing technology for dismantling the hollow plate girder bridge has some defects, for example, the mechanical chiseling force is often controlled manually by experience when a bridge deck pavement layer is dismantled, so that the girder body is prevented from being damaged and broken; the safety protection support arranged when the hollow slab is hung and disassembled needs to pour a large number of strip foundations or pile bodies, so that the problems of complicated construction, high construction cost and the like caused by a riverbed and peripheral soft foundations are solved; in addition, when the old bridge is dismantled, part of the construction waste with smaller grain size or lighter weight is easy to suspend or float in river water after falling into the river, and is washed away by the river water to cause downstream river pollution.
Disclosure of Invention
The invention aims to provide a prestressed hollow slab beam bridge dismantling system and a construction method, which are reasonable in structure, safe and environment-friendly in construction, rapid in dismantling and cost-saving.
In order to solve the technical problem, the invention provides a construction method for a prestressed hollow slab beam bridge dismantling system, which comprises the following steps of:
1) a sewage interception dam is arranged at the downstream of the river channel: pressing profile steel into a river bed at a certain interval, embedding a combined steel template into the river bed at a certain depth along the profile steel by using the profile steel as a support, exposing the top of the combined steel template out of the river bed at a certain height, and paving and installing a steel wire mesh on the upstream face to intercept floaters and suspended matters;
2) installing a safety protection bracket: firstly, installing and fixing a plurality of brackets on the upper parts of pier columns of an old bridge, installing steel platform surfaces on the brackets to form an integral bracket bearing platform, then installing lower longitudinal beams on the bracket bearing platforms of two pier columns longitudinally adjacent to the old bridge, installing upright columns on the lower longitudinal beams at intervals, installing connecting reinforcing supports between the adjacent upright columns, and installing upper cross beams on the upright columns to form a safety protection support below the old bridge;
3) dismantling the guardrails of the bridge deck, pulling the guardrails down on the bridge deck to be temporarily stable, and then cutting off the connecting reinforcing steel bars between the guardrails and the bridge deck pavement layer;
4) before the bridge deck pavement layer is removed, an elevation control device is manufactured according to the pavement thickness, the elevation control device is installed at the air pick cylinder body, the depth of the air pick for chiseling the bridge deck pavement layer is controlled by a constructor, and then the bridge deck pavement layer and the expansion joint device are chiseled by the air pick;
5) dismantling the hollow slab: firstly, crushing and dismantling the connecting parts between the hollow plates, and lifting the hollow plates piece by piece for further crushing, dismantling and processing; secondly, after the hollow slab is hoisted and disassembled, the safety protection bracket is hoisted and disassembled integrally;
6) dismantling the capping beam: firstly, installing a Bailey beam on a transverse bracket bearing platform of an old bridge, and then paving a platform panel on the Bailey beam to form a construction platform system; and secondly, cutting a single capping beam into 3 pieces, and respectively hoisting and dismantling the pieces.
7) And (3) dismantling the construction platform system and the bracket bearing platform, dismantling the pier stud section by section to a certain depth below the bottom of the river bed, hoisting the pier stud section by section to perform further crushing and treatment, finally cleaning the river channel and recovering the original appearance, and completing the construction of the prestressed hollow slab girder bridge dismantling system.
The invention has the advantages that:
1. compared with the prior art, the sewage interception dam adopted by the invention has the advantages of reasonable structure and simple construction, and can intercept and clean various sewage and garbage in the river channel without cutting off in the whole dismantling process.
2. According to the invention, the safety protection support and the construction platform system which are formed by being installed on the bracket bearing platform foundation are adopted, the original bridge foundation is used, the condition that the bearing capacity of a riverbed and a peripheral foundation is poor is overcome, a large number of temporary buttress foundations are not required to be newly added, the construction cost is reduced, the construction period is saved, and meanwhile, the bolt installation and fixation are adopted, so that the disassembly and the assembly are convenient, and the technical benefit advantage is obvious.
3. The elevation control device is simple to manufacture and convenient to install, chiseling depth is effectively controlled, beam slabs are prevented from being damaged, meanwhile, the limit baffle in the device can resist fragments which may splash in the construction process, and safety of construction personnel is protected.
Drawings
FIG. 1 is a construction flow chart of a prestressed hollow slab girder bridge dismantling system;
FIG. 2 is a layout view of a corbel table and safety shield support;
FIG. 3 is a schematic cross-sectional view of FIG. 2;
FIG. 4 is a schematic view of a dirt intercepting dam;
FIG. 5 is a left side view of FIG. 4;
FIG. 6 is a top view of the elevation control device;
fig. 7 is a schematic view of the connection of the elevation control device to the pick;
FIG. 8 is a schematic layout of a construction platform system;
fig. 9 is a top view of a-a in fig. 8.
Reference numerals: 1-a guardrail; 2-bridge deck pavement layer; 3-hollow plate; 4-capping beam; 5-pier stud; 6-bracket bearing platform; 7-safety protection bracket; 8-upper beam; 9-upright column; 10-connecting a reinforcing support; 11-lower longitudinal beam; 12-air pick; 13-elevation control device; 14-fastening bolts; 15-semicircular tightening; 16-rubber pad; 17-hinge pin; 18-a limit baffle; 19-connecting rod; 20-section steel; 21-wire mesh; 22-combined steel form; 23-river surface; 24-the riverbed; 25-platform panel; 26-bailey beam; 27-steel table top; 28-bracket.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
As shown in fig. 1 to 9, the present invention provides a prestressed hollow slab girder bridge demolishing system, which includes a corbel table 6 disposed on an upper portion of a pier stud 5, a safety protection bracket 7 disposed between a hollow slab 3 and the corbel table 6, an elevation control device 13 disposed on an air pick 12, a dirt intercepting dam disposed on a downstream of a river, and a construction platform system hooped on the pier stud 5.
Specifically, one side that the pier stud was kept away from to bracket one end and steel mesa is connected, and the bracket other end is connected with the pier stud for form the triangle-shaped structure between bracket, steel mesa and the pier stud lateral wall, and then improve the overall structural strength of bracket cushion cap.
The safety protection support 7 comprises an upper cross beam 8, upright columns 9, connecting reinforcing supports 10 and a lower longitudinal beam 11, wherein the upright columns 9 are arranged between the upper cross beam 8 and the lower longitudinal beam 11, two ends of the lower longitudinal beam 11 are fixed on a steel platform surface 27 through bolts, and the connecting reinforcing supports 10 are arranged between the upper part and the lower part of two adjacent upright columns 9.
Specifically, the projection of entablature and longeron down on the horizontal plane is vertical setting, and the one end of even system is strengthened propping and is connected on the upper portion of one of them stand of two adjacent stands, and the other end of even system is strengthened propping and is connected in the lower part of another stand for the system is strengthened propping and is set up in the direction of height slope, and in an embodiment of this scheme, the system is strengthened propping and is set up the quantity for the even number even, and wherein half the system is strengthened propping and is supported the slope angle on the direction of height opposite with half the system of linking of half, makes two parts link and strengthen propping and be "X" type structure after fixing, is used for increasing the structural strength between the two adjacent stands.
Specifically, in this scheme, the both sides of hinge bolt all are equipped with the semicircle lock ring, when installation or dismantlement elevation controlling means, unscrew fastening bolt and break away from the one end of semicircle lock ring, will hinge the semicircle lock ring of bolt both sides afterwards and rotate for the hinge bolt, make the semicircle lock ring of both sides be the open mode, so that put into or take out the pick from the position between the semicircle lock ring of both sides, fix the semicircle lock ring of both sides through fastening bolt once more afterwards, in order to guarantee the connection stability between pick and the elevation controlling means.
The filth interception dam include shaped steel 20, wire net 21 and combination steel form 22, the setting of shaped steel 20 lower extreme is in riverbed 24, and the upper end exposes the surface of water take the altitude, combination steel form 22 sets up the upstream face at shaped steel 20 and riverbed 24 juncture, wire net 21 sets up at shaped steel 20 upstream face, just wire net 21 is located combination steel form 22's top.
The construction platform system comprises a bracket bearing platform 6, a Bailey beam 26 and a platform panel 25, wherein the Bailey beam 26 is arranged on the bracket bearing platform 6, and the platform panel 25 is arranged on the Bailey beam 26.
The invention also discloses a construction method of the prestressed hollow slab girder bridge dismantling system, which comprises the following steps:
1) as shown in fig. 4 and 5, according to the river channel on-site survey, firstly, a dirt intercepting dam is arranged at a proper position of the downstream of the river channel, profile steel 20 is pressed into a river bed 24 at a certain interval by adopting an excavator, then the profile steel 20 is used as a support, a combined steel template 22 is buried into the river bed at a certain depth along the profile steel 20, the top of the combined steel template 22 is exposed out of the river bed at a certain height, then a steel wire mesh 21 is laid and installed on the upstream face to intercept floaters and suspended matters, and a specially-assigned person is arranged for regularly cleaning;
the upper end of the steel wire mesh 21 is higher than the river surface 23 so as to ensure the blocking and intercepting function of the steel wire mesh 21 on floaters on the river surface 23;
2) as shown in fig. 2 and 3, the safety shield 7 is mounted: firstly, a plurality of brackets 28 are fixedly installed on the upper parts of old bridge pier columns 5 by using anchor bolts, steel table surfaces 27 are bolted and installed on the brackets 28 to form an integral bracket bearing platform 6, then lower longitudinal beams 11 are bolted and installed on the bracket bearing platforms 6 of two adjacent pier columns 5 in the longitudinal direction of the old bridge, upright columns 9 are welded and installed on the lower longitudinal beams 11 at intervals, connecting reinforcing supports 10 are welded and installed between the adjacent upright columns 9, and then upper cross beams 8 are welded and installed on the upright columns 9, so that a safety protection support 7 is formed below the old bridge;
3) mechanically removing a guardrail 1 of the bridge floor, directly pulling the guardrail 1 down on the bridge floor by using an excavator for temporary stabilization, then cutting off connecting reinforcing steel bars of the guardrail 1 and a bridge deck pavement layer 2 by using equipment by constructors, and loading sundries on the guardrail 1 for transportation;
4) as shown in fig. 6 and 7, before the bridge deck pavement layer 2 is removed, an elevation control device 13 is manufactured according to the pavement thickness, the elevation control device 13 is installed at the cylinder of the air pick 12 to assist the constructor in controlling the depth of the air pick 12 for chiseling the bridge deck pavement layer 2, and then the bridge deck pavement layer 2 and the expansion joint device are chiseled by equipment such as the air pick 12;
wherein, confirm the position that elevation control device 13 installed on pneumatic pick 12 according to the thickness of bridge deck pavement layer 2, specifically, limit the chiseling degree of depth of pneumatic pick 12 through the distance of limit baffle 18 to pneumatic pick 12 bottom to guarantee that pneumatic pick 12 chisels the degree of depth and matches the thickness of bridge deck pavement layer 2.
5) Dismantling the hollow slab: firstly, crushing and dismantling the connecting parts between the hollow plates 3, hoisting the hollow plates 3 piece by using a crane and placing the hollow plates in a nearby crushing field for further crushing, dismantling and processing; secondly, after the hollow slab 3 is hung and disassembled, the whole safety protection bracket 7 is hung and disassembled, and the hollow slab is placed on a site which is leveled in advance near the old bridge for disassembly;
6) dismantling the capping beam: firstly, as shown in fig. 8 and 9, a Bailey beam 26 is bolted and installed on the transverse bracket bearing platform 6 of the old bridge, and then a platform panel 25 is laid on the Bailey beam 26 to form a construction platform system; secondly, cutting a single bent cap 4 into 3 pieces, respectively hoisting and dismantling the 3 pieces, namely cutting 10cm positions on two sides of the upright post, binding two ends of the bent cap 4 pieces by using a steel wire rope before cutting, hoisting and protecting by using a crane, cutting, directly hoisting after cutting off, putting on a transport vehicle, and transporting to a crushing area for crushing;
7) and (3) dismantling the construction platform system and the bracket bearing platform 6, dismantling the pier stud 5 section by section to a certain depth below the bottom of the river bed, hoisting section by section to a transport vehicle, transporting to a crushing field for further crushing and treatment, finally cleaning the river channel and recovering the original appearance, and completing the construction of the prestressed hollow slab beam bridge dismantling system.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (10)
1. A construction method of a prestressed hollow slab beam bridge dismantling system is characterized by comprising the following steps:
1) a sewage interception dam is arranged at the downstream of the river channel: pressing the profile steel (20) into a river bed (24) at a certain interval, embedding the profile steel (20) into the river bed at a certain depth along the profile steel (20) by using a combined steel template (22) by taking the profile steel (20) as a support, exposing the top of the combined steel template (22) out of the river bed at a certain height, and laying and installing a steel wire mesh (21) on the upstream face to intercept floaters and suspended matters;
2) the safety protection bracket (7) is installed: firstly, installing and fixing a plurality of brackets (28) on the upper parts of old bridge pier columns (5), installing steel table tops (27) on the brackets (28) to form an integral bracket bearing platform (6), then installing lower longitudinal beams (11) on the bracket bearing platform (6) of two adjacent longitudinal bridge pier columns (5), installing upright columns (9) on the lower longitudinal beams (11) at intervals, installing connecting reinforcement supports (10) between the adjacent upright columns (9), and installing upper cross beams (8) on the upright columns (9) to form a safety protection support (7) below the old bridge;
3) dismantling the guardrail (1) of the bridge floor, pulling down the guardrail (1) on the bridge floor for temporary stabilization, and then cutting off connecting steel bars of the guardrail (1) and the bridge floor pavement layer (2);
4) before the bridge deck pavement layer (2) is dismantled, an elevation control device (13) is manufactured according to the pavement thickness, the elevation control device (13) is installed at a cylinder body of the pneumatic pick (12), a constructor is assisted to control the depth of the pneumatic pick (12) for chiseling the bridge deck pavement layer (2), and then the pneumatic pick (12) is used for chiseling the bridge deck pavement layer (2) and the expansion joint device;
5) dismantling the hollow slab: firstly, crushing and dismantling the connecting parts among the hollow plates (3), and lifting the hollow plates (3) piece by piece for further crushing, dismantling and processing; secondly, after the hollow slab (3) is hung and disassembled, the safety protection bracket (7) is integrally hung and disassembled;
6) dismantling the capping beam: firstly, installing a Bailey beam (26) on a transverse bracket bearing platform (6) of an old bridge, and then paving a platform panel (25) on the Bailey beam (26) to form a construction platform system; and secondly, cutting the single bent cap (4) into 3 pieces to be respectively hoisted and dismantled.
2. The construction method of the prestressed hollow slab girder bridge demolition system according to claim 1, further comprising the steps of:
7) and (3) dismantling the construction platform system and the bracket bearing platform (6), dismantling the pier stud (5) section by section to a certain depth below the bottom of the river bed, hoisting the pier stud section by section into the river bed for further crushing and treatment, finally cleaning the river channel and recovering the original appearance, and completing the construction of the prestressed hollow slab girder bridge dismantling system.
3. The construction method of the prestressed hollow slab girder bridge demolition system according to claim 1, wherein: bracket cushion cap (6) include steel mesa (27) and multichannel bracket (28), bracket (28) set up on pier stud (5) upper portion, steel mesa (27) set up and form an organic whole on multichannel bracket (28).
4. The construction method of the prestressed hollow slab girder bridge demolition system according to claim 1, wherein: the safety protection support (7) comprises an upper cross beam (8), upright columns (9), a connecting reinforcing support (10) and a lower longitudinal beam (11), wherein the upright columns (9) are arranged between the upper cross beam (8) and the lower longitudinal beam (11), two ends of the lower longitudinal beam (11) are fixed on a steel table top (27), and the connecting reinforcing support (10) is arranged between two adjacent upright columns (9).
5. The construction method of the prestressed hollow slab girder bridge demolition system according to claim 4, wherein: the projection of the upper cross beam (8) and the lower longitudinal beam (11) on the horizontal plane is vertical, one end of the connecting reinforcing support (10) is connected to the upper part of one upright (9) of the two adjacent uprights (9), and the other end of the connecting reinforcing support (10) is connected to the lower part of the other upright (9).
6. The construction method of the prestressed hollow slab girder bridge demolition system according to claim 1, wherein: elevation controlling means (13) including fastening bolt (14), semicircle lock ring (15), rubber pad (16), articulated bolt (17), limit baffle (18) and connecting rod (19), semicircle lock ring (15) inboard is equipped with rubber pad (16), semicircle lock ring (15) one end is tied (17) through the articulated and is linked to each other with connecting rod (19), L shape limit baffle (18) are connected in connecting rod (19).
7. The construction method of the prestressed hollow slab girder bridge demolition system according to claim 1, wherein: the filth interception dam include shaped steel (20), wire net (21) and combination steel form (22), shaped steel (20) lower extreme sets up in riverbed (24), the upper end exposes to the water a take the altitude, combination steel form (22) set up the upstream face at shaped steel (20) and riverbed (24) juncture, wire net (21) set up at shaped steel (20) upstream face, just wire net (21) are located the top of combination steel form (22).
8. The construction method of the prestressed hollow slab girder bridge demolition system according to claim 1, wherein: the construction platform system comprises a bracket bearing platform (6), a Bailey beam (26) and a platform panel (25), wherein the Bailey beam (26) is arranged on the bracket bearing platform (6), and the platform panel (25) is arranged on the Bailey beam (26).
9. The construction method of the prestressed hollow slab girder bridge demolition system according to claim 1, wherein: the upper end of the steel wire mesh (21) is higher than the river surface (23).
10. A prestressed hollow slab girder bridge demolition system obtained by the construction method according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111643108.9A CN114134829B (en) | 2021-12-29 | 2021-12-29 | Prestressed hollow slab girder bridge dismantling system and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111643108.9A CN114134829B (en) | 2021-12-29 | 2021-12-29 | Prestressed hollow slab girder bridge dismantling system and construction method |
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| CN114134829A true CN114134829A (en) | 2022-03-04 |
| CN114134829B CN114134829B (en) | 2023-08-08 |
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| JP2005240488A (en) * | 2004-02-27 | 2005-09-08 | Kuraimu:Kk | Demolishing method of precast concrete bridge |
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| CN114134829B (en) | 2023-08-08 |
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