CN112575693A - Cantilever lifting appliance for reinforced concrete composite beam and safety protection method - Google Patents
Cantilever lifting appliance for reinforced concrete composite beam and safety protection method Download PDFInfo
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- CN112575693A CN112575693A CN202011372409.8A CN202011372409A CN112575693A CN 112575693 A CN112575693 A CN 112575693A CN 202011372409 A CN202011372409 A CN 202011372409A CN 112575693 A CN112575693 A CN 112575693A
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- cantilever
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- composite beam
- safety protection
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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
- E01D21/10—Cantilevered erection
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- Civil Engineering (AREA)
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- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a cantilever lifting appliance for a reinforced concrete composite beam, which comprises a right-angled triangle cantilever support, wherein channel steel is arranged on two right-angled sides of the right-angled triangle cantilever support back to back, and a gap is formed between the channel steel and the corresponding right-angled side so that a bolt lifting rod can penetrate through the gap. The technical problems that the steel-concrete composite beam is large in height and the lower part of the steel-concrete composite beam needs to be opened and passed are solved. The problem of adjusting the cross slopes of the roads on the left side and the right side of the bridge is solved. Simple structure and convenient operation. Safe and reliable, the practicality is strong. Can be repeatedly used, and the use cost is reduced. In addition, the application also provides a safety protection method.
Description
Technical Field
The invention relates to the field of bridge engineering, in particular to a cantilever lifting appliance for a reinforced concrete composite beam and a safety protection method.
Background
The steel-concrete composite beam is a transverse bearing member formed by integrally connecting a steel beam and a concrete slab through a shear connector.
In bridge engineering, the steel-concrete composite beam has the characteristics of large span, steel saving, good earthquake resistance and the like, and is widely applied in the engineering field.
The steel-concrete composite beam body is processed in a factory according to designed sections, the steel-concrete composite beam body is transported to a construction site to be assembled and welded to be molded after being processed, a top concrete panel is poured after welding, and the steel beam body and the concrete panel are connected into a whole through shear nails to form an integral stress structure.
Support can be done to traditional full hall support mode when current combination beam height is lower and the below does not have the expert car requirement, when highly higher and the below has the expert car demand, traditional full hall support is difficult to adapt to its requirement.
Disclosure of Invention
The invention aims to provide a cantilever lifting appliance for a steel-concrete composite beam and a safety protection method, so as to solve the problems.
In order to achieve the above purpose of the invention, the following technical scheme is adopted:
the utility model provides a reinforced concrete composite beam cantilever hoist, includes right angled triangle cantilever support, the channel-section steel is installed back to back on two right-angle sides of right angled triangle cantilever support, the channel-section steel with correspond be equipped with the clearance between the right-angle side to the bolt jib passes.
Furthermore, 1 steel bar is vertically welded on one right-angle edge of the right-angle triangular cantilever support to serve as a fixed fulcrum of the safety protection device.
Furthermore, 2 steel bars are clamped and welded between the channel steel and the corresponding right-angle side to form the gap.
Furthermore, 1 reinforcing steel bar is welded between the hypotenuse of right triangle cantilever crane and one of the right-angle sides to strengthen the overall structure intensity.
In order to achieve the above object, according to another aspect of the present application, there is provided a safety protection method including the steps of:
drilling holes in flanges of the combination beam in a cantilever mode so that the bolt hanging rods can penetrate through the holes;
after drilling, the bolt suspender penetrates through the flange cantilever to fasten the right-angled triangular cantilever support on the flange cantilever of the steel-concrete composite beam, wherein a steel pipe is arranged between the right-angled triangular cantilever support and the flange cantilever of the composite beam, at the moment, one right-angled side of the right-angled triangular cantilever support is tightly attached to a web of the composite beam, the other right-angled side of the right-angled triangular cantilever support is in a horizontal state, a longitudinal support is longitudinally arranged on the fastened right-angled triangular cantilever support, and the height of the longitudinal support is smaller than the length of the steel pipe arranged between the right-angled triangular cantilever support and the flange cantilever of the composite beam, so that preparation is made;
and after the cross slope is adjusted, paving a bridge deck bottom formwork, and arranging a protective device on the basis of the fixation of the safety protective device.
Further, the cross slope adjusting method comprises the following steps: and properly increasing or reducing the thick bamboo plywood according to the designed elevation of the bridge deck slab to adjust the elevation.
Further, the protection device is a safety protection railing or a safety flat net.
Furthermore, the laying width of the bottom die exceeds that of the bridge deck, so that the bottom die is used as a pedestrian passageway.
Further, the longitudinal supports are made of square timbers or I-shaped steel.
Further, the paving width of the bottom die exceeds the bridge deck by 0.3-0.5 m.
By adopting the technical scheme, the invention has the following beneficial effects:
1. the technical problems that the steel-concrete composite beam is large in height and the lower part of the steel-concrete composite beam needs to be opened and passed are solved.
2. The problem of adjusting the cross slopes of the roads on the left side and the right side of the bridge is solved.
3. Simple structure and convenient operation.
4. Safe and reliable, the practicality is strong.
5. Can be repeatedly used, and the use cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a steel-concrete composite beam cantilever sling provided by the invention.
Fig. 2 is a schematic view of the structure in direction a in fig. 1.
Fig. 3 is a schematic view of the structure in the direction B in fig. 1.
Reference numerals: 1-right-angled triangular outriggers; 2-right-angle side; 3-channel steel; 4-clearance; 5-reinforcing steel bars; 6-bevel edge.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The first embodiment is as follows:
the utility model provides a reinforced concrete composite beam cantilever hoist, includes right angled triangle cantilever support 1, and channel-section steel 3 is installed back to back on two right-angle sides 2 of right angled triangle cantilever support 1, is equipped with clearance 4 between channel-section steel 3 and the right-angle side 2 that corresponds to the bolt jib passes.
Specifically, 1 reinforcing steel bar 5 is vertically welded on a right-angle side 2 of the right-angled triangle cantilever support 1, and the right-angled triangle cantilever support is used as a fixed fulcrum of the safety protection device.
Specifically, 2 steel bars 5 are clamped and welded between the channel steel 3 and the corresponding right-angle side 2 to form a gap 4.
Specifically, 1 reinforcing steel bar 5 is welded between hypotenuse 6 and a right-angle side 2 of right triangle outrigger 1 to reinforcing whole body structural strength.
The application also provides a safety protection method, which comprises the following steps: adopt [100mm type channel-section steel 3 preparation right-angled triangle cantilever 1, two right-angle sides 2 are about 1m and 2m long respectively (can reduce or increase according to actual conditions), adopt equal model channel-section steel 3 to be hypotenuse 6, connect two right-angle sides 2 and weld into holistic right-angled triangle. In addition, the same type channel steel 3 with the length of about 30cm is additionally welded back to back on the two right- angle sides 2, 2 steel bars 5 with the diameter of 30mm are welded between the two back-to-back channel steel 3 and the corresponding right-angle sides 2 in a clamping mode, and the purpose is to separately arrange the two channel steel 3 so that a bolt suspender (high-strength bolt) with the diameter of 25mm can penetrate through the two channel steel 3 to fasten the support on a flange cantilever of the steel-concrete composite beam.
1 reinforcing steel bar 5 with the diameter of 30mm is welded with the inclined edge 6 at 1/2 of the rectangular edge 2 with the length of 2m so as to enhance the integral structural strength of the triangular bracket.
Cutting a steel pipe with the diameter of 30mm according to a section of 10cm, wherein the number of the steel pipes is consistent with that of the cantilever brackets;
1 reinforcing steel bar 5 with the length of 1-1.2 m and the diameter of 30mm is vertically welded on one right-angle side 2 and used as a fixed fulcrum of the safety protection net, and the welding position of the reinforcing steel bar 5 is 0.3-0.5 m (used as a pedestrian passageway) outside the bridge deck of the steel-concrete composite beam.
After the cantilever support is manufactured, drilling holes on the flange of the combination beam according to the longitudinal distance of 0.8-1 m, wherein the hole diameter is more than or equal to 25mm, so that a bolt suspender (high-strength bolt) with the diameter of 25mm can penetrate through the holes;
after drilling, a bolt suspender (high-strength bolt) with the diameter of 25mm penetrates through the flange cantilever to fasten the right-angled triangular cantilever support 1 on the flange cantilever of the steel-concrete composite beam, wherein a cut steel pipe with the diameter of 30mm is arranged between the right-angled triangular cantilever support 1 and the flange cantilever of the composite beam; the parts are as follows from top to bottom: a high-strength bolt nut, a combined beam flange cantilever, a steel pipe with the diameter of 30mm, a 2m right-angle side of a triangular flange cantilever support and the high-strength bolt nut;
at the moment, a 1m long right-angle side 2 is tightly attached to a combined beam web, a 2m long right-angle side 2 is in a horizontal state, 8 multiplied by 8cm square timber or I8I-shaped steel is longitudinally arranged on a fastened right-angle triangular cantilever support 1 to serve as longitudinal support (8cm high support material is shorter than a 10cm steel pipe, and preparation is made for adjusting a cross slope), and the transverse distance between the square timber and the I-shaped steel is generally 10-30 cm calculated according to the weight of concrete;
and (3) cross slope adjustment: because the bridge is generally provided with the cross slope, the state of the cross slope relative to the right-angled triangle cantilever support 1 is that the side with the high bridge cross slope is upwarped and the side with the low bridge cross slope is inclined downwards; after the longitudinal support is arranged, the cross slope is adjusted according to a drawing, and the method comprises the following steps: at the moment, the longitudinal support height of the wood or the I-steel above the cantilever is lower than the designed elevation of the bridge deck, an adjustable space is left, and the elevation can be adjusted by properly increasing or reducing 1cm thick bamboo plywood according to the designed elevation of the bridge deck.
The bridge deck bottom formwork is laid after the cross slope is adjusted according to the bridge cross slope, the bottom formwork is laid to be 0.3-0.5 m (used for a pedestrian passageway) beyond the bridge deck, a reinforcing steel bar 5 which is 1-1.2 m long and 30mm in diameter is arranged on the right-angled triangular cantilever support 1, the reinforcing steel bar 5 serves as a safety protection fixed point, threaded steel with 10mm in diameter is welded normally in the vertical direction, and the vertical distance between the threaded steel and the reinforcing steel is about 30cm and serves as a safety protection handrail and a handrail. Or purchasing a finished product of the safety plain net, and connecting the safety plain net with a reinforcing steel bar 5 which is 1-1.2 m long and 30mm in diameter and welded on the right-angled triangular cantilever support 1 by adopting a binding wire.
If the cantilever of the steel-concrete composite beam is shorter, the right-angle triangular cantilever support 1 can be turned, the long right-angle side 2 of 2m is tightly attached to the web of the composite beam, the long right-angle side 2 of 1m is in a horizontal state, and the rest operations are the same as above.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a reinforced concrete composite beam cantilever hoist, its characterized in that, includes right triangle cantilever brace, the channel-section steel is installed back to back on two right-angle sides of right triangle cantilever brace, the channel-section steel with correspond be equipped with the clearance between the right-angle side to the bolt jib passes.
2. The steel-concrete composite beam cantilever sling according to claim 1, wherein 1 steel bar is vertically welded on one of the right-angle sides of the right-angle triangular cantilever support to serve as a fixed fulcrum of a safety protection device.
3. The steel-concrete composite beam cantilever sling according to claim 1, wherein 2 steel bars are welded between the channel steel and the corresponding right-angle side to form the gap.
4. The steel-concrete composite beam cantilever sling according to claim 1, wherein 1 steel bar is welded between the hypotenuse of the right-angled triangular cantilever support and one of the catheti to enhance the overall structural strength.
5. A safety protection method is characterized by comprising the following steps:
drilling holes in flanges of the combination beam in a cantilever mode so that the bolt hanging rods can penetrate through the holes;
after drilling, the bolt suspender penetrates through the flange cantilever to fasten the right-angled triangular cantilever support on the flange cantilever of the steel-concrete composite beam, wherein a steel pipe is arranged between the right-angled triangular cantilever support and the flange cantilever of the composite beam, at the moment, one right-angled side of the right-angled triangular cantilever support is tightly attached to a web of the composite beam, the other right-angled side of the right-angled triangular cantilever support is in a horizontal state, a longitudinal support is longitudinally arranged on the fastened right-angled triangular cantilever support, and the height of the longitudinal support is smaller than the length of the steel pipe arranged between the right-angled triangular cantilever support and the flange cantilever of the composite beam, so that preparation is made;
and after the cross slope is adjusted, paving a bridge deck bottom formwork, and arranging a protective device on the basis of the fixation of the safety protective device.
6. The safety protection method according to claim 5, wherein the cross slope adjustment method comprises the following steps: and properly increasing or reducing the thick bamboo plywood according to the designed elevation of the bridge deck slab to adjust the elevation.
7. The method of safety protection according to claim 5, wherein the protection device is a safety protection rail or a safety flat net.
8. The safety protection method according to claim 5, wherein the bottom die is laid to a width exceeding the bridge deck for pedestrian passage.
9. A safety shield method according to claim 5, wherein the longitudinal supports are made of square timber or I-steel.
10. The safety protection method according to claim 8, wherein the bottom die laying width exceeds the bridge deck by 0.3-0.5 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011372409.8A CN112575693A (en) | 2020-11-30 | 2020-11-30 | Cantilever lifting appliance for reinforced concrete composite beam and safety protection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011372409.8A CN112575693A (en) | 2020-11-30 | 2020-11-30 | Cantilever lifting appliance for reinforced concrete composite beam and safety protection method |
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| CN112575693A true CN112575693A (en) | 2021-03-30 |
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| CN202011372409.8A Pending CN112575693A (en) | 2020-11-30 | 2020-11-30 | Cantilever lifting appliance for reinforced concrete composite beam and safety protection method |
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| CN111335181A (en) * | 2020-04-17 | 2020-06-26 | 中国二十二冶集团有限公司 | Mounting support frame and mounting method for cast-in-place concrete structure template of steel-concrete composite beam flange plate |
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| CN201762663U (en) * | 2010-08-26 | 2011-03-16 | 北京市公路桥梁建设集团有限公司 | Reinforced concrete superposed beam wing board support |
| KR101433064B1 (en) * | 2013-03-14 | 2014-09-23 | 임성묵 | Composite beam using steel plate beam and tendon and the construction method therefor |
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Application publication date: 20210330 |