CN111188280A - Cast-in-place box girder steel pipe support dismantling device and method - Google Patents
Cast-in-place box girder steel pipe support dismantling device and method Download PDFInfo
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- CN111188280A CN111188280A CN202010107677.0A CN202010107677A CN111188280A CN 111188280 A CN111188280 A CN 111188280A CN 202010107677 A CN202010107677 A CN 202010107677A CN 111188280 A CN111188280 A CN 111188280A
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- box girder
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a cast-in-place box girder steel pipe support dismantling device and a dismantling method, wherein the device comprises the following steps: the main framework comprises two main beams arranged in parallel and a plurality of coupled beams connected between the two main beams, and the length of each main beam is greater than the width of the cast-in-place box beam; the end part frameworks are fixed on the end parts of the two ends of the main body framework and comprise end beams which are respectively and fixedly connected to the end parts of the two main beams in the same direction, and a hanging rod for hanging a steel wire pulley hook is fixedly connected between the tops of the two end beams on each end part; and the steel wire rope on the winch bypasses the steel wire pulley and is connected to the steel pipe bracket to be dismantled. The cast-in-place box girder steel pipe support dismantling device is simple to manufacture, convenient to use, high in safety, high in construction speed and efficiency, economical and practical, and crane cost is saved during construction of the cast-in-place box girder steel pipe support dismantling device.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a cast-in-place box girder steel pipe support dismantling device and a cast-in-place box girder steel pipe support dismantling method.
Background
After the cast-in-place box girder is poured, the steel pipe support is difficult to remove by adopting a single 25-ton truck crane, the support is easy to swing excessively, the stability of the support is influenced, and the clearance height between the support and the poured box girder cannot meet the vertical lifting operation of a crane. Two 25-ton cranes are adopted to carry out dismantling operation from two sides, but the site is limited, and the ground slope is steep, so that the construction operation requirements of the cranes cannot be met.
Disclosure of Invention
The invention mainly aims at the defects of the prior art and provides a cast-in-place box girder steel pipe support dismantling device and a dismantling method.
The technical scheme adopted by the invention is as follows: the utility model provides a cast-in-place box girder steel pipe support demolishs device which includes:
the main framework comprises two main beams arranged in parallel and a plurality of coupled beams connected between the two main beams, and the length of each main beam is greater than the width of a cast-in-place box beam;
the end part frameworks are fixed on the end parts of the two ends of the main body framework and comprise end beams which are respectively and fixedly connected to the end parts of the two ends of the two main beams in the same direction, and a hanging rod for hanging a steel wire pulley hook is fixedly connected between the tops of the two end beams on each end part;
and the steel wire rope on the winch bypasses the steel wire pulley and is connected to the steel pipe bracket to be dismantled.
The cast-in-place box girder steel pipe support dismantling device is simple to manufacture, convenient to use, high in safety, high in construction speed and efficiency, economical and practical, and crane cost is saved during construction of the cast-in-place box girder steel pipe support dismantling device.
The cast-in-place box girder steel pipe support dismantling device is further improved in that the main girders are made of I-shaped steel, and a plurality of coupled girders are respectively welded and fixed on the upper surfaces of top wing plates and bottom wing plates of the two main girders.
The cast-in-place box girder steel pipe support dismantling device is further improved in that the coupled beam adopts channel steel.
The cast-in-place box girder steel pipe support dismantling device is further improved in that end plates are connected to the outer side end faces of two end girders on each end of the main girder framework in a sealing mode.
The cast-in-place box girder steel pipe support dismantling device is further improved in that a reinforcing plate is welded and fixed between the hanging rod and the end plate.
The cast-in-place box girder steel pipe support dismantling device is further improved in that the number of the reinforcing plates is at least two, and the reinforcing plates are symmetrically arranged on the longitudinal center line of the two main girders.
The cast-in-place box girder steel pipe support dismantling device is further improved in that splayed inclined struts are welded and fixed between the hanging rods and the two end girders on the two sides.
A cast-in-place box girder steel pipe support dismantling method comprises the following steps:
manufacturing a cast-in-place box girder steel pipe support dismantling device, wherein the length of the cast-in-place box girder steel pipe support dismantling device is larger than the width of a cast-in-place box girder;
laying the cast-in-place box beam steel pipe bracket dismantling device on the top surface of the cast-in-place box beam along the width direction of the cast-in-place box beam and at a position which is deviated from a steel pipe bracket to be dismantled, wherein two ends of the cast-in-place box beam steel pipe bracket dismantling device exceed two sides of the cast-in-place box beam;
hanging a steel wire pulley with a steel wire rope penetrating through a winch on hanging rods of end frameworks at two ends;
fixing a winch on a construction site, and offsetting the position of the winch vertically below the cast-in-place box girder;
loosening the steel pipe bracket to be dismantled and a connecting flange in front of the lower pipe joint, and binding a steel wire rope of a winch on the steel pipe bracket to be dismantled;
and starting a winch, hoisting the steel pipe support to be dismantled to the position of the lower pipe joint in which the center deviates from the center obliquely upwards, and vertically lowering the steel pipe support to a construction site to complete the dismantling of the steel pipe support.
The cast-in-situ box girder steel pipe bracket dismantling method is further improved in that the cast-in-situ box girder steel pipe bracket dismantling device is arranged at a position which is 200cm away from the center of the steel pipe bracket.
The cast-in-place box girder steel pipe support dismantling method is further improved in that two winches are adopted and symmetrically arranged on two sides of the cast-in-place box girder, and a steel wire rope on each winch is correspondingly connected to a steel wire pulley on a hanging rod of the end framework on the corresponding side.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a plan view of a cast-in-place box girder steel pipe bracket dismantling device according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view taken at a-a in fig. 1.
Fig. 3 is an enlarged schematic view of the end skeleton of fig. 2.
Fig. 4 is a cross-sectional view at B-B in fig. 2.
Fig. 5 is a schematic structural diagram of a cast-in-place box girder steel pipe support before being disassembled.
Fig. 6 is a schematic front view illustrating the removal of a steel pipe bracket using the cast-in-place box girder steel pipe bracket removing apparatus of fig. 1 (the bracket is not lifted away).
Fig. 7 is a side view schematically illustrating the removal of a steel pipe support using the cast-in-place box girder steel pipe support removing apparatus of fig. 1 (the support is not lifted away).
Fig. 8 is a front view (with the bracket lifted away) illustrating the removal of a steel pipe bracket using the cast-in-place box girder steel pipe bracket removing apparatus of fig. 1.
Fig. 9 is a process flow diagram of a cast-in-place box girder steel pipe bracket dismantling method according to an embodiment of the invention.
Fig. 10 is a single-section assembled plan view of a cast-in-place box girder steel pipe support in the embodiment of the invention.
FIG. 11 is a plan view of a cast-in-place box girder steel pipe support in the embodiment of the present invention.
Fig. 12 is a single-section assembled front view of a cast-in-place box girder steel pipe bracket in the embodiment of the invention.
FIG. 13 is a side view of a cast-in-place box girder steel pipe support in an embodiment of the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The invention is described in further detail below with reference to the figures and specific examples.
Referring to fig. 1 to 4 and 5 to 8, the embodiment of the invention provides a cast-in-place box girder steel pipe support dismantling device which mainly comprises a main body framework 11, an end framework 12 and a steel wire pulley 14, wherein the main body framework, the end framework 12 and the steel wire pulley 14 are matched with a winch 13 for use, so that the cast-in-place box girder steel pipe support can be dismantled conveniently, quickly and safely.
In the embodiment of the invention, the cast-in-place box girder steel pipe bracket 20 is made of 6 phi 325 x 6mm channel steel and [16B channel steel and [8B channel steel, and the weight is as follows: 6 multiplied by 62.538kg/m +500kg 2751kg, and the single-joint processing is as shown in FIGS. 10-13.
As shown in fig. 1 to 4 and 5 to 8, in the cast-in-place box girder steel pipe support dismantling device according to the embodiment of the present invention, the main body framework 11 is further formed by integrally welding two main girders 111 arranged in parallel and a plurality of coupled girders 112 connected between the two main girders 111, and the length of the main girder 111 is greater than the width of the cast-in-place box girder 21. Wherein, the two main beams 111 are made of I20B I-steel. The middle of each main beam 111 is connected and reinforced by an upper layer of coupled beam 112 and a lower layer of coupled beam 112 at intervals of 200cm, and the coupled beams 112 can be [8# channel steel with openings facing downwards and are respectively welded and fixed on the upper surfaces of top wing plates and bottom wing plates of the two main beams 111.
The end frame 12 is fixed on the two ends of the main frame 11, and includes end beams 121 respectively fixed on the two ends of the two main beams 111 in the same direction, and a hanging rod 122 for hanging the wire pulley 14 hook is fixedly connected between the tops of the two end beams 121 on each end. The end beams 121 at the two ends are made of I20B I-steel with the length of 70cm, the lower surface of the lower flange of the end beam 121 is welded and fixed with the upper surface of the upper flange of the main beam 111, and equivalently, the end beams 121 are respectively stacked on the tops of the two ends of each main beam 111, so that the strength of the end parts of the main beams 111 can be enhanced. The steel wire pulleys 14 are respectively hung on the two hanging rods 122 on the end portion frameworks 12 at the two ends, the steel wire pulleys 14 are used for winding steel wire ropes 131 on the windlasses 13, the windlasses 13 are used for hoisting and dismantling steel pipe supports 20 below the cast-in-place box girder 21, when the device is used, the two windlasses are installed on the ground of a construction site, the steel wire ropes 131 on the two windlasses 13 correspondingly wind the steel wire pulleys 14 on the hanging rods 122 at the two ends of the dismantling device one by one, then the steel wire pulleys are fixedly connected with the steel pipe supports to be dismantled, and the hoisting of the steel pipe supports can be implemented by starting the windlasses.
Preferably, to enhance the strength of the end frame 12, an end plate 123 is connected to the outer end face of the two end beams 121 of the end frame 12 at each end of the main beam frame 11 in a sealing manner. Reinforcing plates 124 are further welded and fixed between the hanging rods 122 and the end plates 123, the number of the reinforcing plates 124 is at least two, and the reinforcing plates are symmetrically arranged on the longitudinal center line of the two main beams 111. The reinforcing plates 124 are arranged at intervals, and the space between the two middle reinforcing plates 124 can be used for limiting the lifting hook of the wire pulley 14. Splayed inclined struts 125 are welded and fixed between the hanging rod 122 and the two end beams 121 on the two sides. The hanging rod 122 is made of phi 32 round steel, and the diameter of the round steel is matched with the lifting hook of the steel wire pulley 14.
The cast-in-place box girder steel pipe support dismantling device is simple to manufacture, convenient to use, high in safety, high in construction speed and efficiency, economical and practical, and crane cost is saved during construction of the cast-in-place box girder steel pipe support dismantling device.
The method for removing the steel pipe bracket by using the cast-in-place box girder steel pipe bracket removing device of the invention will be described in detail with reference to fig. 1 to 4 and fig. 5 to 9. As shown in the figure, the method for dismantling the cast-in-place box girder steel pipe support mainly comprises the following steps:
manufacturing a cast-in-place box girder steel pipe bracket dismounting device 10, so that the length of the manufactured cast-in-place box girder steel pipe bracket dismounting device 10 is greater than the width of a cast-in-place box girder 21;
laying the cast-in-situ box girder steel pipe bracket dismantling device 10 on the top surface of the cast-in-situ box girder 21 along the width direction of the cast-in-situ box girder 21 and deviating the position of the steel pipe bracket 20 to be dismantled, wherein two ends of the cast-in-situ box girder steel pipe bracket dismantling device exceed two sides of the cast-in-situ box girder 21;
a steel wire pulley 14 provided with a steel wire rope 131 of a winch 13 is hung on hanging rods 122 of end frameworks 12 at two ends;
fixing the winch 13 on the construction site and offsetting the vertical lower part of the cast-in-place box girder 21;
loosening the connecting flange in front of the steel pipe bracket 20 to be dismantled and the lower pipe joint 201, and binding the steel wire rope 131 of the winch 13 on the steel pipe bracket 20 to be dismantled;
and starting the winch 13, hoisting the steel pipe support 20 to be dismantled to the position of the lower pipe joint 201 with the center deviated from the center obliquely upwards, and vertically lowering the steel pipe support to the construction site to complete the dismantling of the steel pipe support 20.
The construction key points in the cast-in-place box girder steel pipe bracket dismantling construction step are further explained in detail as follows:
material selection and blanking processing of material
The material for manufacturing the support removing device is strictly closed so as to ensure the safety of the form removing construction. When the I-steel is selected, attention should be paid to whether the I-steel has slag inclusion, peeling and crack cracking phenomena. Secondly, the surface must be clean, the surface has greasy dirt and should be cleaned up and have granular or rust stain to remove completely, if the I-steel that leaves the pockmark after cleaning up the rust removal, the use is forbidden strictly. Selecting non-joint I-steel, accurately blanking according to on-site actual measurement data of the blanking length of the I-steel, flattening the beam end of the I-steel with the vertical supporting function, polishing and flattening if necessary, ensuring smooth connection and good supporting stress.
(II) manufacturing of support dismantling device
The form removing device is manufactured according to the design drawing, the lap joint between the I-shaped steel and the I-shaped steel is fully welded firmly to ensure the firmness and reliability of the whole form removing device, and the problem that the construction safety is influenced due to the fact that welding spots are detached from the joint under the stress condition is avoided. After the manufacturing is finished and the inspection and acceptance are qualified, the method can be used for field construction.
Winch and support dismantling device in-place installation
The total weight of a single section of support is 2451.8Kg, two 2t hoists are adopted as hoisting machinery, the two hoists are respectively arranged on two sides of the support and are reinforced, the hoists can not be arranged below the support in a vertical mode, the safe distance is ensured, and meanwhile the hoisting and dismantling work of the hoists is not influenced. The support form removal device is installed on the top of the cast-in-place beam, and in order to facilitate the steel pipe support to be lowered, the cast-in-place box beam steel pipe support removal device 10 is installed at a position which is 200cm away from the center of the steel pipe support 21, as shown in fig. 6.
(IV) Steel pipe support tied by steel wire rope
A steel wire rope with the diameter of 20mm is used as a lifting rope, the dismounting device is mounted and reinforced, before the steel pipe overpass flange bolt is loosened, the steel wire rope is firstly used for lifting the support, the lifting points are arranged on two sides of the cross brace on the top of the support, the balance and the non-deviation are ensured during lifting, and the connection of the lifting points is firm and reliable.
(V) loosening flange plate connecting bolt at bottom of support
After the hoisting point is checked to be qualified, the flange plate bolt can be loosened.
(VI) synchronously starting hoist to hoist steel pipe bracket
Because the support is eccentrically stressed by the dismounting device, the steel pipe upright support is slowly lifted to a certain height after the bolt is completely loosened, and the support is slowly prevented from excessively shaking in the process of straightening the support, so that the construction safety is influenced. During the use process of the bracket, the bracket is inspected at any time for the phenomena of cracks, brittle fracture, poor welding performance and remarkable abnormal mechanical performance.
(VII) slowly lowering steel pipe support
After the steel pipe upright post support is lifted and swung steadily, the steel pipe support can be slowly lowered to the ground, and the steel wire rope is loosened after the stability is confirmed.
(VIII) moving away steel pipe upright post bracket
The steel pipe support is placed on the ground, and the support is lifted by a crane to vacate the position, so that space is provided for subsequent dismantling operation.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a cast-in-place box girder steel pipe support demolishs device which characterized in that includes:
the main framework comprises two main beams arranged in parallel and a plurality of coupled beams connected between the two main beams, and the length of each main beam is greater than the width of a cast-in-place box beam;
the end part frameworks are fixed on the end parts of the two ends of the main body framework and comprise end beams which are respectively and fixedly connected to the end parts of the two ends of the two main beams in the same direction, and a hanging rod for hanging a steel wire pulley hook is fixedly connected between the tops of the two end beams on each end part;
and the steel wire rope on the winch bypasses the steel wire pulley and is connected to the steel pipe bracket to be dismantled.
2. The cast-in-place box girder steel pipe bracket dismounting device of claim 1, characterized in that: the girder adopts the I-steel, twice the top pterygoid lamina of girder and the upper surface of bottom pterygoid lamina welded fastening have the multichannel respectively the allied oneself with limb roof beam.
3. The cast-in-place box girder steel pipe bracket dismantling device of claim 2, wherein: the coupled beam adopts channel steel.
4. The cast-in-place box girder steel pipe bracket dismounting device of claim 1, characterized in that: and end plates are hermetically connected to the outer side end faces of the end beams of two paths on each end part of the main beam framework.
5. The cast-in-place box girder steel pipe bracket dismounting device of claim 4, wherein: and a reinforcing plate is welded and fixed between the hanging rod and the end plate.
6. The cast-in-place box girder steel pipe bracket dismounting device of claim 5, wherein: the number of the reinforcing plates is at least two, and the reinforcing plates are arranged symmetrically to the longitudinal middle line of the two main beams.
7. The cast-in-place box girder steel pipe bracket dismounting device of claim 1, characterized in that: splayed inclined struts are welded and fixed between the hanging rod and the two end beams on the two sides.
8. A cast-in-place box girder steel pipe support dismantling method is characterized by comprising the following steps:
manufacturing a cast-in-place box girder steel pipe support dismantling device according to any one of claims 1 to 7, wherein the length of the cast-in-place box girder steel pipe support dismantling device is larger than the width of a cast-in-place box girder;
laying the cast-in-place box beam steel pipe bracket dismantling device on the top surface of the cast-in-place box beam along the width direction of the cast-in-place box beam and at a position which is deviated from a steel pipe bracket to be dismantled, wherein two ends of the cast-in-place box beam steel pipe bracket dismantling device exceed two sides of the cast-in-place box beam;
hanging a steel wire pulley with a steel wire rope penetrating through a winch on hanging rods of end frameworks at two ends;
fixing a winch on a construction site, and offsetting the position of the winch vertically below the cast-in-place box girder;
loosening the steel pipe bracket to be dismantled and a connecting flange in front of the lower pipe joint, and binding a steel wire rope of a winch on the steel pipe bracket to be dismantled;
and starting a winch, hoisting the steel pipe support to be dismantled to the position of the lower pipe joint in which the center deviates from the center obliquely upwards, and vertically lowering the steel pipe support to a construction site to complete the dismantling of the steel pipe support.
9. The cast-in-place box girder steel pipe support dismantling method as claimed in claim 8, wherein: the cast-in-situ box girder steel pipe support dismantling device is arranged at a position which is 200cm away from the center of the steel pipe support.
10. The cast-in-place box girder steel pipe support dismantling method as claimed in claim 8, wherein: two winches are adopted and symmetrically arranged on two sides of the cast-in-place box girder, and a steel wire rope on each winch is correspondingly connected to a steel wire pulley on a hanging rod of the end part framework on the corresponding side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010107677.0A CN111188280A (en) | 2020-02-21 | 2020-02-21 | Cast-in-place box girder steel pipe support dismantling device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010107677.0A CN111188280A (en) | 2020-02-21 | 2020-02-21 | Cast-in-place box girder steel pipe support dismantling device and method |
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| Publication Number | Publication Date |
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| CN111188280A true CN111188280A (en) | 2020-05-22 |
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| CN202010107677.0A Pending CN111188280A (en) | 2020-02-21 | 2020-02-21 | Cast-in-place box girder steel pipe support dismantling device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960481A (en) * | 2022-06-15 | 2022-08-30 | 中建八局第三建设有限公司 | Large-span Bailey beam portal unloading and dismantling construction method |
-
2020
- 2020-02-21 CN CN202010107677.0A patent/CN111188280A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960481A (en) * | 2022-06-15 | 2022-08-30 | 中建八局第三建设有限公司 | Large-span Bailey beam portal unloading and dismantling construction method |
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