CN105002833A - Suspension type hanging basket prepressing device and hanging basket prepressing method - Google Patents
Suspension type hanging basket prepressing device and hanging basket prepressing method Download PDFInfo
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- CN105002833A CN105002833A CN201510443725.2A CN201510443725A CN105002833A CN 105002833 A CN105002833 A CN 105002833A CN 201510443725 A CN201510443725 A CN 201510443725A CN 105002833 A CN105002833 A CN 105002833A
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- hanging basket
- carrying platform
- distribution beam
- prepressing device
- heap carrying
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Abstract
The invention discloses a suspension type hanging basket prepressing device, comprising a pile-loading platform used for bearing a counter-weight and distribution beams arranged in a hanging basket. The distribution beams are installed on a hanging basket soffit formwork, the pile-loading platform is hung below the hanging basket through steel strands, the upper end of the steel strand is connected with the distribution beams, and the lower end of the steel strand is connected with the pile-loading platform. The invention also discloses a hanging basket prepressing method. The method comprises the steps of 1, installing the distribution beams; 2, hanging the pile-loading platform; 3, exerting prepressing load in a graded manner; 4, removing the load; and 5, calculating the elastic deformation of the hanging basket soffit formwork. The suspension type hanging basket prepressing device is simple in structure, is convenient to install and remove, and can be reused, and the cost is lowered. The hanging basket prepressing method is simple in operation, high in operation efficiency and convenient to popularize and apply.
Description
Technical field
The invention belongs to Hanging Basket prestressing technology field, specifically relate to a kind of suspension Hanging Basket prepressing device and Hanging Basket preloading method.
Background technology
The most competitive bridge types such as zanjon, rivers, Hu Hai crossed over by large span prestressed concrete continuous rigid frame bridge, continuous girder bridge.Owing to being subject to the bridge location place influence of topography, the construction of Hanging Basket cantilever pouring becomes one of main construction method.Hanging Basket is formed primarily of steel, nonelastic deformation and elastic deformation will be produced under load action, the object of Hanging Basket precompressed is mainly in order to eliminate Hanging Basket nonelastic deformation, determine elastic deformation (taking in encircle value in advance in mould absolute altitude), secondly precompressed is also the safety and stability in order to verify Hanging Basket.Therefore, Hanging Basket must carry out precompressed before cantilever construction uses.
At present, the common methods of Hanging Basket precompressed is piling prepressing, reverse drawing precompressed, back-pressure precompressed on Hanging Basket soffit formwork.Specific as follows:
Piling prepressing needs prefabricating load (sandbag or water tank and other) to be divided into the identical inner wrapping of weight specification, during precompressed, need to be utilized by these prefabricating loads tower crane or alternate manner to be transported on Hanging Basket soffit formwork, when bridge pier is higher, hierarchical loading can be caused, unloading expends time in length, workload is large, and prefabricating load recycling rate of waterused is low, and whole precompressed cost is high.
Reverse drawing precompressed utilizes drag unit to carry out Hanging Basket precompressed, prepressing device needs on cushion cap or ground arranges fastening devices, Hanging Basket soffit formwork utilize jack device carry out a kind of method of stretch-draw precompressed, this preloading method needs to arrange ground tackle, steel strand (essence pricks screw-thread steel), and cost is relatively high.Pre-pressing system safety simultaneously depends primarily on anchor system, and therefore, need the safety of whole system when spending very high cost guarantee precompressed, anchor system is installed, removed workload greatly simultaneously, and expend time in, reusable efficiency is relatively low.More importantly be subject to the restriction of bridge pier height, when load transfer device adopts steel strand, bridge pier height is higher, and steel strand distortion is larger, may cause jack stroke deficiency, makes to be exerted pressure operating difficulties by stretch-draw, even cannot implement.
Back-pressure precompressed utilizes the pre-embedded steel slab being embedded in casting beams section termination, is welded on steel plate, jack is placed in a kind of Hanging Basket prepressing device between reaction frame and template by precompressed reaction frame.This device adds and unloads carried convenient, saves time; Reaction frame makes simply, cost is low; Precompressed operates on Hanging Basket soffit formwork, and space is large, easy to operate.But this device is installed, dismounting is complicated, can recycling rate of waterused low; May be large due to reaction frame distortion in pre-compaction process, cause jack and reaction rack equipment that bias occurs, cause reaction frame torsional buckling, precompressed success rate is lower.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art, a kind of suspension Hanging Basket prepressing device is provided.The structure of this suspension Hanging Basket prepressing device is simple, and it is extremely convenient to mount and dismount, and has saved cost, and can reuse.
For achieving the above object, the technical scheme that suspension Hanging Basket prepressing device of the present invention adopts is: suspension Hanging Basket prepressing device, it is characterized in that: the distribution beam comprising the heap carrying platform for placing mass and be arranged in Hanging Basket, described distribution beam is arranged on Hanging Basket soffit formwork, described heap carrying platform is suspended in the below of described Hanging Basket by steel strand, the upper end of described steel strand is connected with described distribution beam, and the lower end of described steel strand is connected with described heap carrying platform.
Above-mentioned suspension Hanging Basket prepressing device, is characterized in that: described heap carrying platform closely face.
Above-mentioned suspension Hanging Basket prepressing device, is characterized in that: described heap carrying platform distance ground 1m ~ 1.5m.
Above-mentioned suspension Hanging Basket prepressing device, is characterized in that: described distribution beam and heap carrying platform are all laid along the transverse direction of bridge.
Above-mentioned suspension Hanging Basket prepressing device, is characterized in that: the quantity of described distribution beam is two, and two described distribution beam are parallel to each other laying.
Above-mentioned suspension Hanging Basket prepressing device, is characterized in that: described distribution beam is provided with for first linking up with of being connected with steel strand, described heap carrying platform is provided with for second linking up with of being connected with steel strand.
Above-mentioned suspension Hanging Basket prepressing device, is characterized in that: described distribution beam is weld by two channel-section steels the box-girder formed.
Above-mentioned suspension Hanging Basket prepressing device, is characterized in that: described heap carrying platform is provided with the ring baffle for preventing mass from coming off.
Present invention also offers a kind of Hanging Basket preloading method, this preloading method simple to operate, operating efficiency is high, is convenient to promote the use of.
For achieving the above object, the technical scheme that Hanging Basket preloading method of the present invention adopts is: a kind of Hanging Basket preloading method, and it is characterized in that, the method comprises:
Step one, installation distribution beam: distribution beam is arranged on Hanging Basket soffit formwork;
Step 2, suspention heap carrying platform: heap carrying platform is transported to below Hanging Basket, the upper end of steel strand is fixed in distribution beam, and the other end of steel strand is fixed on heap carrying platform, then measure the initial deflection value y of Hanging Basket soffit formwork
0;
Step 3, classification apply prefabricating load: on heap carrying platform, place mass carry out hierarchical loading, prefabricating load is reached when being loaded on 120% of most crossbeam section weight, then stop loading, stop loading the maximum immunity value y of rear measurement Hanging Basket soffit formwork under described prefabricating load
max;
Step 4, unloading: remove the mass on heap carrying platform and removed by described suspension Hanging Basket prepressing device, then measure the unloaded deflection value y after the unloading of Hanging Basket soffit formwork
min;
The elastic deformation amount X of step 5, calculating Hanging Basket soffit formwork
2:
First formula X=y is utilized
max-y
0calculate the total deformation X of Hanging Basket soffit formwork;
Recycling formula X
1=y
min-y
0calculate the nonelastic deformation amount X of Hanging Basket soffit formwork
1; Finally utilize formula X
2=X-X
1calculate the elastic deformation amount X of Hanging Basket soffit formwork
2.
Above-mentioned Hanging Basket preloading method, it is characterized in that: before step 3, on heap carrying platform, place mass carry out prestrain, the weight of prestrain is 40% ~ 50% of prefabricating load, checks the safe condition of described suspension Hanging Basket prepressing device under described preload condition.
The present invention compared with prior art has the following advantages:
1, suspension Hanging Basket prepressing device of the present invention and Hanging Basket preloading method are compared with piling prepressing mode in prior art, can effectively avoid being utilized by prefabricating load the modes such as tower crane to be transported on Hanging Basket soffit formwork, save a large amount of time, and decrease workload, reduce precompressed cost.
2, suspension Hanging Basket prepressing device of the present invention and Hanging Basket preloading method are compared with reverse drawing precompressed mode in prior art, eliminate the installation and removal of anchor system, while cost-saving, can also save a large amount of time.
3, suspension Hanging Basket prepressing device of the present invention and Hanging Basket preloading method are compared with back-pressure precompressed mode in prior art, eliminate the installation of reaction frame, and then avoid the reaction frame torsional buckling that causes because of the large deformation of reaction frame and precompressed success rate lower, safety is high.
In sum, the structure of suspension Hanging Basket prepressing device of the present invention is simple, convenient disassembly, can recycling rate of waterused high, cost is low, saves the time, and available one or two cover suspension Hanging Basket prepressing device carries out turnover use, across interior, quick across a movement.Hanging Basket preloading method compression and decompression of the present invention is convenient, simple to operate, greatly saves the time, has saved the duration.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the front view of suspension Hanging Basket prepressing device of the present invention.
Fig. 2 is the right view of suspension Hanging Basket prepressing device of the present invention.
Fig. 3 is the structural representation of distribution beam in suspension Hanging Basket prepressing device of the present invention.
Fig. 4 is the annexation schematic diagram piling carrying platform and ring baffle in suspension Hanging Basket prepressing device of the present invention.
Fig. 5 is the method flow diagram of Hanging Basket preloading method of the present invention.
Description of reference numerals:
1-heap carrying platform; 2-steel strand; 3-distribution beam;
4-Hanging Basket; 4-1-Hanging Basket soffit formwork; 5-water beam section;
6-bridge pier; 7-the first hook; 8-ring baffle;
9-the second hook.
Detailed description of the invention
A kind of suspension Hanging Basket prepressing device as depicted in figs. 1 and 2, the distribution beam 3 comprising the heap carrying platform 1 for placing mass and be arranged in Hanging Basket 4, described distribution beam 3 is arranged on Hanging Basket soffit formwork 4-1, described heap carrying platform 1 is suspended in the below of described Hanging Basket 4 by steel strand 2, the upper end of described steel strand 2 is connected with described distribution beam 3, and the lower end of described steel strand 2 is connected with described heap carrying platform 1.
In the present embodiment, this suspension Hanging Basket prepressing device in use, by placing mass to load on the heap carrying platform 1 being positioned at bridge pier 6 side, steel hinge line 2 is utilized to be delivered in distribution beam 3 by loading force on heap carrying platform 1, precompression is applied again by distribution beam 3 couples of Hanging Basket soffit formwork 4-1, namely a kind of suspension structure is formed effectively to apply precompression to Hanging Basket soffit formwork 4-1 by heap carrying platform 1, distribution beam 3 and steel strand 2, its structure is simple, it is extremely convenient to mount and dismount, and can reuse.And because heap carrying platform 1 is suspended in the below of Hanging Basket 4, facilitate and place mass on heap carrying platform 1, improve precompressed efficiency.
In the present embodiment, described heap carrying platform 1 is near ground.Further facilitated and place mass on heap carrying platform 1, and further increased precompressed efficiency, and the height piling carrying platform 1 is low, even if heap carrying platform 1 places very heavy configuration thing, also do not have potential safety hazard.In the present embodiment, preferred way is, described heap carrying platform 1 is apart from ground 1m ~ 1.5m.So both can not make heap carrying platform 1 and earth surface, and also greatly facilitate simultaneously and place mass on heap carrying platform 1.
As depicted in figs. 1 and 2, described distribution beam 3 and heap carrying platform 1 are all laid along the transverse direction of bridge.By the transverse direction of distribution beam 3 along bridge being laid, facilitating the installation and removal of distribution beam 3, distribution beam 3 couples of Hanging Basket soffit formwork 4-1 can be made to apply uniform precompression simultaneously.By being laid along the transverse direction of bridge by heap carrying platform 1, described heap carrying platform 1 is corresponding with distribution beam 3, and the loading force on heap carrying platform 1 can be made like this to be delivered to uniformly in distribution beam 3.
In the present embodiment, the quantity of described distribution beam 3 is two, and two described distribution beam 3 are parallel to each other laying.Two parallel distribution beam 3 effectively can apply precompression to Hanging Basket soffit formwork 4-1.
As shown in Figure 3, described distribution beam 3 is provided with and first links up with 10 for what be connected with steel strand 2 upper end.By arranging the first hook 10 in distribution beam 3, steel strand 2 can be realized and be connected with the firm of distribution beam 3, avoid steel strand 2 to produce slippage with the tie point of distribution beam 3.
As shown in Figure 4, described heap carrying platform 1 is provided with and second links up with 9 for what be connected with steel strand 2 lower end.By arranging the second hook 9 on heap carrying platform 1, steel strand 2 can be realized and be connected with heap the firm of carrying platform 1, avoid steel strand 2 to produce slippage with the tie point of heap carrying platform 1.
In the present embodiment, described distribution beam 3 is weld by two channel-section steels the box-girder formed.Facilitate the making of distribution beam 3 like this, simultaneously, when installing distribution beam 3, as long as distribution beam 3 is placed on Hanging Basket soffit formwork 4-1, utilize the distribution beam 3 of box beam form to contact with Hanging Basket soffit formwork 4-1 to coordinate, and under the pulling force effect of heap carrying platform 1, the installation of distribution beam 3 on Hanging Basket soffit formwork 4-1 can be realized.
As shown in Figure 4, described heap carrying platform 1 is provided with the ring baffle 8 for preventing mass from coming off.By arranging ring baffle 8 on heap carrying platform 1, can effectively prevent mass from coming off, ensure that safety.
As shown in Figure 5 a kind of utilizes above-mentioned suspension Hanging Basket prepressing device Hanging Basket to be carried out to the method for precompressed, and the method comprises:
Step one, installation distribution beam 3: distribution beam 3 be arranged on Hanging Basket soffit formwork 4-1, Hanging Basket 4 is arranged on and waters in beam section 5;
Step 2, suspention heap carrying platform 1: heap carrying platform 1 is transported to below Hanging Basket 4, the upper end of steel strand 2 is fixed in distribution beam 3, and the other end of steel strand 2 is fixed on heap carrying platform 1, then measure the initial deflection value y of Hanging Basket soffit formwork 4-1
0;
Step 3, classification apply prefabricating load: on heap carrying platform, place mass carry out hierarchical loading, prefabricating load is reached when being loaded on 120% of most crossbeam section weight, then stop loading, stop loading the maximum immunity value y of rear measurement Hanging Basket soffit formwork under prefabricating load
max, described maximum immunity value y
maxbe the stabilization at Hanging Basket soffit formwork 4-1, record when namely Hanging Basket soffit formwork 4-1 deflection value does not change; While hierarchical loading, measure the classification deflection value y of Hanging Basket soffit formwork 4-1 under every grade of loading
n, with the distortion of real time monitoring Hanging Basket soffit formwork 4-1, when sudden change appears in the distortion of Hanging Basket soffit formwork 4-1, then illustrate that Hanging Basket quality goes wrong;
Step 4, unloading: remove the mass on heap carrying platform 1 and removed by described suspension Hanging Basket prepressing device, then measure the unloaded deflection value y after Hanging Basket soffit formwork 4-1 unloading
min;
The elastic deformation amount X of step 5, calculating Hanging Basket soffit formwork 4-1
2:
First formula X=y is utilized
max-y
0calculate the total deformation X of Hanging Basket soffit formwork 4-1;
Recycling formula X
1=y
min-y
0calculate the nonelastic deformation amount X of Hanging Basket soffit formwork 4-1
1;
Finally utilize formula X
2=X-X
1calculate the elastic deformation amount X of Hanging Basket soffit formwork 4-1
2.
In the present embodiment, this preloading method is simple to operate, and operating efficiency is high, can eliminate the nonelastic deformation of Hanging Basket 4, and then determine elastic deformation, secondly effectively can verify the safety and stability of Hanging Basket 4.In the present embodiment, utilize level gauge and total station survey deflection value.
In the present embodiment, before step 3, on heap carrying platform 1, place mass carry out prestrain, the weight of prestrain is 40% ~ 50% of described prefabricating load, checks the safe condition of described suspension Hanging Basket prepressing device under preload condition.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure transformation, all still belong in the protection domain of technical solution of the present invention.
Claims (10)
1. suspension Hanging Basket prepressing device, it is characterized in that: the distribution beam (3) comprising the heap carrying platform (1) for placing mass and be arranged in Hanging Basket (4), described distribution beam (3) is arranged on Hanging Basket soffit formwork (4-1), described heap carrying platform (1) is suspended in the below of described Hanging Basket (4) by steel strand (2), the upper end of described steel strand (2) is connected with described distribution beam (3), and the lower end of described steel strand (2) is connected with described heap carrying platform (1).
2. suspension Hanging Basket prepressing device according to claim 1, is characterized in that: described heap carrying platform (1) is near ground.
3. suspension Hanging Basket prepressing device according to claim 2, is characterized in that: described heap carrying platform (1) distance ground 1m ~ 1.5m.
4. suspension Hanging Basket prepressing device according to claim 1, is characterized in that: described distribution beam (3) and heap carrying platform (1) are all laid along the transverse direction of bridge.
5. suspension Hanging Basket prepressing device according to claim 1, is characterized in that: the quantity of described distribution beam (3) is two, and two described distribution beam (3) are parallel to each other laying.
6. suspension Hanging Basket prepressing device according to claim 1, it is characterized in that: described distribution beam (3) is provided with for first linking up with (7) of being connected with steel strand (2), described heap carrying platform (1) is provided with for second linking up with (9) of being connected with steel strand (2).
7. suspension Hanging Basket prepressing device according to claim 1, is characterized in that: described distribution beam (3) is for weld by two channel-section steels the box-girder formed.
8. suspension Hanging Basket prepressing device according to claim 1, is characterized in that: described heap carrying platform (1) is provided with the ring baffle (8) for preventing mass from coming off.
9. utilize suspension Hanging Basket prepressing device as claimed in claim 1 Hanging Basket to be carried out to a method for precompressed, it is characterized in that, the method comprises:
Step one, installation distribution beam (3): distribution beam (3) is arranged on Hanging Basket soffit formwork (4-1);
Step 2, suspention heap carrying platform (1): carrying platform (1) will be piled and be transported to Hanging Basket (4) below, the upper end of steel strand (2) is fixed in distribution beam (3), and the other end of steel strand (2) is fixed on heap carrying platform (1), then measure the initial deflection value y of Hanging Basket soffit formwork (4-1)
0;
Step 3, classification apply prefabricating load: carry out hierarchical loading to the upper mass of placing of heap carrying platform (1), prefabricating load is reached when being loaded on 120% of most crossbeam section weight, then stop loading, stop loading rear measurement Hanging Basket soffit formwork (4-1) the maximum immunity value y under described prefabricating load
max;
Step 4, unloading: remove the mass on heap carrying platform (1) and removed by described suspension Hanging Basket prepressing device, then measure the unloaded deflection value y after Hanging Basket soffit formwork (4-1) unloading
min;
The elastic deformation amount X of step 5, calculating Hanging Basket soffit formwork (4-1)
2:
First formula X=y is utilized
max-y
0calculate the total deformation X of Hanging Basket soffit formwork (4-1);
Recycling formula X
1=y
min-y
0calculate the nonelastic deformation amount X of Hanging Basket soffit formwork (4-1)
1;
Finally utilize formula X
2=X-X
1calculate the elastic deformation amount X of Hanging Basket soffit formwork (4-1)
2.
10. method according to claim 9, it is characterized in that: before step 3, prestrain is carried out to the upper mass of placing of heap carrying platform (1), the weight of prestrain is 40% ~ 50% of described prefabricating load, checks the safe condition of described suspension Hanging Basket prepressing device under preload condition.
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| CN111693366A (en) * | 2020-05-27 | 2020-09-22 | 中冶建筑研究总院有限公司 | Construction method for pre-loading structure in limited space |
| CN113152293A (en) * | 2021-04-16 | 2021-07-23 | 中国葛洲坝集团第一工程有限公司 | Continuous rigid frame bridge cast-in-place bracket prepressing device and prepressing method |
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| CN114182649A (en) * | 2021-12-10 | 2022-03-15 | 中铁十局集团青岛工程有限公司 | Continuous beam hanging basket construction pre-pressing loading device |
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| CN113152293B (en) * | 2021-04-16 | 2023-02-24 | 中国葛洲坝集团第一工程有限公司 | Continuous rigid frame bridge cast-in-place bracket prepressing device and prepressing method |
| CN113585073A (en) * | 2021-06-28 | 2021-11-02 | 浙江理工大学 | Counterweight method of suspension platform |
| CN113430953A (en) * | 2021-07-28 | 2021-09-24 | 江苏瑞沃建设集团有限公司 | Pre-compaction device of hanging basket for cantilever construction bridge support |
| CN114182649A (en) * | 2021-12-10 | 2022-03-15 | 中铁十局集团青岛工程有限公司 | Continuous beam hanging basket construction pre-pressing loading device |
| CN114182649B (en) * | 2021-12-10 | 2024-01-02 | 中铁十局集团青岛工程有限公司 | Continuous beam hanging basket construction pre-pressing loading device |
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