CN212294351U - Water bag pre-pressing construction equipment for viaduct cast-in-place beam support system - Google Patents
Water bag pre-pressing construction equipment for viaduct cast-in-place beam support system Download PDFInfo
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- CN212294351U CN212294351U CN201922170260.4U CN201922170260U CN212294351U CN 212294351 U CN212294351 U CN 212294351U CN 201922170260 U CN201922170260 U CN 201922170260U CN 212294351 U CN212294351 U CN 212294351U
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Abstract
The utility model discloses a water bag prepressing construction device of a viaduct cast-in-place beam support system, which comprises a water bag, wherein the water bag is sequentially arranged from a low end to a high end from a bottom plate of a viaduct cast-in-place box beam; the outlet of the water bag is arranged at the low end, and the water inlet is arranged at the high end; the water bag is connected with a water source pipeline through a water pipe and is provided with a water pump and a shunt valve; the utility model has the advantages that: the support pre-compaction adopts the water bag to carry out the pre-compaction, verifies that the whole resistance to compression of support satisfies the designing requirement, has eliminated inelastic deformation simultaneously, simple structure, and convenient to use has improved work efficiency, the cost is reduced.
Description
Technical Field
The utility model relates to a construction equipment of overpass, specifically speaking are cast-in-place roof beam support system water bag pre-compaction construction equipment of overpass belongs to overpass construction field.
Background
The support pre-pressing is an important link for support acceptance, the support is tested by simulating the construction process of an upper structure, the support is a necessary condition for verifying whether the support is reasonable in design and can be used for delivery, and the support pre-pressing is also an important means for eliminating the inelastic deformation of a foundation and the support and verifying the elastic deformation of the whole support.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to design a cast-in-place roof beam support system water bag pre-compaction construction equipment of overpass, the support pre-compaction adopts the water bag to carry out the pre-compaction, verifies that the whole resistance to compression of support satisfies the designing requirement, has eliminated inelastic deformation simultaneously, simple structure, and convenient to use has improved work efficiency, the cost is reduced.
The technical scheme of the utility model is that:
the water bag prepressing construction process of the viaduct cast-in-place beam support system comprises the following steps:
(1) calculation of preload
Preloading the integral support by adopting water load to a viaduct cast-in-place box girder support system; the actual stress state of the bracket is simulated as much as possible when the water bag is arranged, and the bracket is pre-pressed according to 1.2 times of the total weight of the self load of the cast concrete;
(2) load distribution
According to the section form of the box girder, calculating the load distribution of the central web plate, the edge web plates, the bottom plates at two sides, the middle bottom plate and the flange plates, and calculating the actual pressure test distribution load according to requirements, wherein the web plate region comprises a chamfering region when being calculated, the chamfering is carried out outside the flange plate calculation region until the edge of the web plate region is averaged, and the bottom plate region is the bottom plate region and the top plate region in the residual region;
(3) safety preparation work before installation of water bag
Checking the installed bottom die; preparing 5-10 small sandbags for each water bag; erecting a simple bracket inclined bridge for laying a water pipe; preparing 3-5 thick ropes with the length of 10m for each water bag, and using the thick ropes for reinforcing and stabilizing in the water adding process;
(4) site cleaning
Cleaning sundries on the pre-pressing template, wrapping the components which cannot be cleaned by soft cloth, and adding an isolation cushion layer on the outer surface, wherein the isolation cushion layer can be isolated by a bamboo plywood if the pre-pressing surface has excessive protruding conical points; holes or gaps are formed in the template splicing ports, and sand bags or soft cloth prepared in advance are used for tightly blocking the holes or the gaps; the support pre-pressing construction range is not less than the width of the projection surface of the construction box girder plus the width of each of two sides which is enlarged by 1 m;
(5) water bag placement
Marking lines in a template pressure test area according to division of a prepressing area; the water bags are sequentially arranged from the lower end to the upper end of the bottom plate of the viaduct cast-in-place box girder; the outlet of the water bag is arranged at the low end, and the water inlet is arranged at the high end;
(6) water source connection
The water pump, the shunt valve and the shunt bag are connected by a water pipe, and the water is pumped into the ditch, so that water pumping is convenient; a prepared mark post is vertically fixed on the template;
the water for prepressing has the following relevant requirements: water source property: tap water; distance of water source: 100 m; water source lift: 15 m; a water injection mode: carrying out hierarchical loading; the installation sequence of the water bag is as follows: single direct mounting; and (3) water treatment after completion: pumping water to a nearby drainage system;
(7) load and settlement observation
The purpose of sedimentation is as follows: determining a bottom die elevation adjustment value and a pre-camber value;
the settlement measuring method comprises the following steps: the plumb bob, the level gauge and the steel ruler are matched;
arrangement of settlement observation points: the box girder bottom plate observation point is provided with 5 sections along the longitudinal direction of the bridge, and the 5 sections are respectively a temporary buttress at two ends, a midspan and an 1/4 midspan; 3 observation points are arranged on one section and are respectively arranged on the middle web plate and the side web plates on the two sides;
loading: the pressure test is divided into four stages of loading, namely 60% → 80% → 100% → 120% of box girder load, and the measurement points are observed before and after loading and unloading. The weight is pre-pressed by a water bag, and a water meter is required to be arranged at the inlet of the water bag before pre-pressing so as to ensure the loading precision. The loading weight is strictly loaded according to the corresponding calculation load of each subarea, and the loading and unloading are symmetrically and uniformly carried out. After loading of each stage of load is finished, the deformation condition of the measuring point is measured by the measuring group, and after the deformation value is calculated without errors by comparison with a theory, the next stage of loading can be carried out after the structural condition is confirmed by field inspection. The load arrangement and detailed loading process is as follows:
loading requirements: when the average value of the settlement difference of the support measuring point for 2 times is less than 2mm, the loading can be continued. The pre-pressing acceptance should meet one of the following requirements: the average value of the settlement of each measuring point is less than 1 mm; the average value of the settlement of each measuring point is less than 5mm continuously for three times;
the unloading is completed in four times, and the symmetrical, uniform and synchronous unloading is ensured. 6h after unloading is finished, carefully measuring the resilience condition of the support, summarizing measured data, and analyzing and determining the elastic and inelastic deformation of the support; setting the pre-camber to determine the pre-camber elevation of the bottom die;
every 20% of the loading process needs to check the welding seam and the fulcrum copy pad part of the structural connection system on site, the measurement group acquires the measurement point data, and the loading can be continued after the structure is confirmed to be correct. In the test process, a measurement group provides 20% measurement deformation values of each stage, and the measurement deformation values are sorted and subjected to data analysis; setting pre-camber according to the sum of the elastic deformation value of the bracket system obtained by pre-pressing and the design pre-camber;
(8) unloading
After the data of the loading measuring points are analyzed to be qualified and the data pass the acceptance, unloading is carried out, wherein the unloading is as follows:
in the first stage, unloading is carried out until the pre-pressing load is 100%, a drain pipe leading to a drainage system is connected with a water outlet valve before unloading, the water outlet valve is opened to uniformly unload each water bag, and the load of each water bag after unloading is ensured to reach 100% of the calculated pre-pressing load;
measuring the rebound value after the first stage unloading is finished for 2h, and unloading the second stage after the rebound data is correct, wherein the second stage is unloaded to 80% of the pre-pressed load;
measuring the rebound value after the second stage unloading is finished for 2h, and unloading the third stage after the rebound data is correct, wherein the unloading of the third stage is to 60% of the pre-pressed load;
measuring a rebound value 2h after the unloading is finished in the third stage, carrying out fourth-stage unloading after the rebound data are correct, unloading all the loads in the fourth stage, and ensuring that the stress of the support is uniform;
and 6h after unloading is finished, carefully measuring the rebound condition of the bracket.
The equipment for the water bag prepressing construction process of the viaduct cast-in-place beam support system comprises the water bags, wherein the water bags are sequentially placed from the lower end to the higher end of a bottom plate of a viaduct cast-in-place box beam; the outlet of the water bag is arranged at the low end, and the water inlet is arranged at the high end; the water bag is connected with a water source pipeline through a water pipe and is provided with a water pump and a shunt valve.
The arrangement of the water bag corresponds to the actual stress state of the support, and the support of the viaduct cast-in-place beam is pre-pressed according to 1.2 times of the total weight of the load of the cast concrete.
5-10 sand bags are distributed on the periphery of each water bag, so that a water belt is prevented from moving when the water bags are filled with water; the water pipe is laid on the simple bracket inclined bridge; the outer surface of each water bag is completely wrapped with a nylon mesh belt so as to enhance the overall stability of the water bag. The four corners of the top of the water bag are respectively provided with a rope, one end of the rope is fixed on the nylon mesh belt wrapping the water bag, and the other end of the rope is fixed on the cast-in-place beam flange plate bracket system, so that the water bag is always stable in the water adding process.
The water bag is used for prepressing, the whole compression resistance of the support is verified to meet the design requirement, and meanwhile, the inelastic deformation is eliminated.
By testing the elastic deformation and the inelastic deformation values of the support, the pre-camber of the support is calculated according to the measured data, and a reliable basis is provided for the elevation of the vertical mold. The strength, rigidity and stability of the structure are tested by simulating the weight, so that the foundation settlement is eliminated and the inelastic deformation of the erected support is eliminated. And the weight is simulated to be used as a basis for controlling the construction elevation of the box girder support.
The utility model has the advantages that: the support pre-compaction adopts the water bag to carry out the pre-compaction, verifies that the whole resistance to compression of support satisfies the designing requirement, has eliminated inelastic deformation simultaneously, simple structure, and convenient to use has improved work efficiency, the cost is reduced.
The present invention will be further explained with reference to the drawings and examples.
Drawings
Fig. 1 is a schematic structural view of a water bag prepressing construction process water bag of a viaduct cast-in-place beam support system in an embodiment of the present invention;
fig. 2 is the utility model provides a construction drawing of cast-in-place roof beam support system water bag pre-compaction construction process of overpass.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is not intended to limit the invention.
Example 1
A water bag pre-pressing construction process for a viaduct cast-in-place beam support system ensures the feasibility and operability of pre-pressing according to the characteristics of engineering and the requirement of a construction period, and selects irrigation pre-pressing for construction.
The specific construction process comprises the following steps:
(1) calculation of preload
Preloading the integral support by adopting water load to a viaduct cast-in-place box girder support system; because the bridge type structure is similar to the scheme, the calculation is carried out by taking the fifteenth standard connection on the left frame of the viaduct as an example, and other reference prepressing is carried out. Calculating the density of the reinforced concrete, taking 2.6t/m for carrying out the high-speed dry-method heavy planting, simulating the actual stress state of the bracket as much as possible when the water bag is arranged, and pre-pressing the bracket according to 1.2 times of the total weight of the self load of the cast concrete.
The water bag is used for prepressing, the whole compression resistance of the support is verified to meet the design requirement, and meanwhile, the inelastic deformation is eliminated.
By testing the elastic deformation and the inelastic deformation values of the support, the pre-camber of the support is calculated according to the measured data, and a reliable basis is provided for the elevation of the vertical mold. The strength, rigidity and stability of the structure are tested by simulating the weight, so that the foundation settlement is eliminated and the inelastic deformation of the erected support is eliminated. And the weight is simulated to be used as a basis for controlling the construction elevation of the box girder support.
(2) Load distribution
According to the section form of the box girder, load distribution of the central web plate, the edge web plates, the bottom plates on two sides, the middle bottom plate and the flange plates is calculated, actual pressure test distribution load is calculated according to requirements, the web plate area includes a chamfering area when being calculated, the chamfering area outside the flange plate calculation area is averaged to the edge of the flange plate calculation area, and the bottom plate area is the bottom plate area and the top plate area in the residual area.
(3) Safety preparation work before installation of water bag
And checking the installed bottom die, wherein the bottom die is a bamboo plywood directly laid on the transverse square timber of the support after the support is erected, the thickness of the bamboo plywood is 15mm, the bamboo plywood is strictly controlled according to the position of a box girder bottom plate during laying, tight splicing is ensured, the height difference of the board is not more than 2mm, and the bottom die is laid and fixed. The bottom die is used for bearing the dead weight load of newly cast concrete and the construction load in the construction process, and the model for ensuring the bottom forming of the cast-in-place box girder is an important condition for ensuring the quality and the safety of the concrete, so the position, the flatness, the geometric dimension and the like of the bottom die must meet the standard requirements, otherwise, the quality of the concrete and the safety in the construction process cannot be ensured;
5-10 sand bags are distributed on the periphery of each water bag, so that a water band is prevented from moving when the water bags are filled with water, and the outer surface of each water bag is completely wrapped by a nylon mesh belt, so that the overall stability of the water bag is enhanced. A rope is respectively arranged at four corners at the top of the water bag, one end of the rope is fixed on a nylon mesh belt wrapping the water bag, and the other end of the rope is fixed on a cast-in-situ beam flange plate bracket system, so that the water bag is always stable in the water adding process (shown in figure 1); before water is injected into the water bag, a simple bracket inclined bridge is firstly erected, so that a water injection pipe of the water bag can be conveniently led to the bridge floor, and the water pipe is prevented from being broken due to overlarge stress in the water injection process;
and hanging safety warning character labels around the construction site, and enclosing the prepressing range to prevent irrelevant personnel from entering.
(4) Site cleaning
Cleaning sundries on the pre-pressing template, wrapping the components which cannot be cleaned by soft cloth, and adding an isolation cushion layer on the outer surface, wherein the isolation cushion layer can be isolated by a bamboo plywood if the pre-pressing surface has excessive protruding conical points; holes or gaps are formed in the template splicing ports, and sand bags or soft cloth prepared in advance are used for tightly blocking the holes or the gaps; the support pre-pressing construction range is not less than the width of the projection surface of the construction box girder plus the width of each expansion of 1m in two sides.
(5) Water bag placement
Marking lines in a template pressure test area according to division of a prepressing area; the water bags are sequentially arranged from the lower end to the high end of the bottom plate of the box girder; the water bag has an outlet at the lower end and a water inlet at the upper end.
(6) Water source connection
The water pump, the shunt valve and the shunt bag are connected by a water pipe, and the water is pumped into the ditch, so that water pumping is convenient; the prepared marker post is vertically fixed on the template.
The water for prepressing has the following relevant requirements: water source property: tap water; distance of water source: 100 m; water source lift: 15 m; a water injection mode: carrying out hierarchical loading; the installation sequence of the water bag is as follows: single direct mounting; and (3) water treatment after completion: pumping the water to a nearby drainage system.
(7) Water bag loading and settlement observation
The purpose of sedimentation is as follows: determining a bottom die elevation adjustment value and a pre-camber value;
the settlement measuring method comprises the following steps: the plumb bob, the level gauge and the steel ruler are matched;
arrangement of settlement observation points: the box girder bottom plate observation point is provided with 5 sections along the longitudinal direction of the bridge, and the 5 sections are respectively a temporary buttress at two ends, a midspan and an 1/4 midspan; one section is provided with 3 observation points which are respectively arranged on the middle web plate and the side web plates at two sides.
Loading: the pressure test is divided into four stages of loading, namely 60% → 80% → 100% → 120% of box girder load, and the measurement points are observed before and after loading and unloading. The weight is pre-pressed by a water bag, and a water meter is required to be arranged at the inlet of the water bag before pre-pressing so as to ensure the loading precision. The loading weight is strictly loaded according to the corresponding calculation load of each subarea, and the loading and unloading are symmetrically and uniformly carried out. After loading of each stage of load is finished, the deformation condition of the measuring point is measured by the measuring group, and after the deformation value is calculated without errors by comparison with a theory, the next stage of loading can be carried out after the structural condition is confirmed by field inspection. The load arrangement and detailed loading process is as follows:
1. a first-stage loading process: the primary loading is carried out according to the load of 60%, the height of each water bag is measured after the loading is finished and is used as the basis for load control during unloading, the water bags are kept still for 12 hours after the loading is finished, the safety and stability conditions of each component are checked, the elevation of an observation point is measured, whether the component is abnormal or not is analyzed, and the secondary loading is carried out if the component is abnormal or not;
2. and (3) secondary loading process: secondary loading to 80% of the load; the same as the requirement in the first-level loading of 1;
3. and (3) a three-stage loading process: tertiary loading to 100% of load; the same as the requirement in the first-level loading of 1;
4. a four-stage loading process: the four-stage loading is up to 120% of the load, which is the same as the requirement in the 1-stage loading.
Loading requirements: when the average value of the settlement difference of the support measuring point for 2 times is less than 2mm, the loading can be continued. The pre-pressing acceptance should meet one of the following requirements: the average value of the settlement of each measuring point is less than 1 mm; the average value of the settlement of each measuring point is less than 5mm after three times of continuous measurement.
The unloading is completed in four times, and the symmetrical, uniform and synchronous unloading is ensured. 6h after unloading is finished, carefully measuring the resilience condition of the support, summarizing measured data, and analyzing and determining the elastic and inelastic deformation of the support; and setting the pre-camber to determine the pre-camber elevation of the bottom die.
Every 20% of the loading process needs to check the welding seam and the fulcrum copy pad part of the structural connection system on site, the measurement group acquires the measurement point data, and the loading can be continued after the structure is confirmed to be correct. In the test process, a measurement group provides 20% of measurement deformation values of each stage, the field technology is responsible for sorting and carrying out data analysis, abnormal conditions need to be reported to a project department for solving and processing, and a formal pressure test report is issued after the test is finished and is respectively reported to a premise office, a general finger and a proprietor unit.
The elevation after stacking-the elevation before pre-pressing = the total deformation value of the system;
after unloading, the elevation after stacking is equal to the elastic deformation value of the system;
the total deformation value of the system-the elastic deformation of the system = the non-elastic deformation eliminated by pre-pressing;
and setting the pre-camber according to the sum of the elastic deformation value of the bracket system obtained by pre-pressing and the design pre-camber.
(8) Unloading of water bags
After the data of the loading measuring points are analyzed to be qualified and the data pass the acceptance, unloading is carried out, wherein the unloading is as follows:
in the first stage, unloading is carried out to 100% of the pre-pressing load, a drain pipe leading to a drainage system is connected with a water outlet valve before unloading, the water outlet valve is opened to uniformly unload each water bag, and the load of each water bag after unloading is ensured to reach 100% of the calculated pre-pressing load (when the load is loaded to 100% of the pre-pressing load, the height of the water bag is measured to be accurate for control);
measuring the rebound value after the first stage unloading is finished for 2h, and unloading the second stage after the rebound data is correct, wherein the second stage is unloaded to 80% of the pre-pressed load;
measuring the rebound value after the second stage unloading is finished for 2h, and unloading the third stage after the rebound data is correct, wherein the unloading of the third stage is to 60% of the pre-pressed load;
measuring a rebound value 2h after the unloading is finished in the third stage, carrying out fourth-stage unloading after the rebound data are correct, unloading all the loads in the fourth stage, and ensuring that the stress of the support is uniform;
and 6h after unloading is finished, carefully measuring the rebound condition of the bracket.
As shown in fig. 1-2, the equipment for the water bag pre-pressing construction process of the viaduct cast-in-place beam support system comprises a water bag 1, wherein the water bag 1 is sequentially arranged from the lower end to the upper end of a bottom plate of a viaduct cast-in-place box beam 2; the outlet of the water bag is arranged at the low end, and the water inlet is arranged at the high end; the water bag is connected with a water source pipeline through a water pipe and is provided with a water pump and a shunt valve.
The arrangement of the water bag corresponds to the actual stress state of the support, and the support of the viaduct cast-in-place beam is pre-pressed according to 1.2 times of the total weight of the load of the cast concrete.
5-10 sand bags are distributed on the periphery of each water bag 1, so that the water bag is prevented from moving when the water bags 1 are filled with water, and the outer surface of each water bag 1 is completely wrapped with a nylon mesh belt 11, so that the overall stability of the water bags 1 is enhanced. A rope is respectively arranged at four corners of the top of the water bag 1, one end of the rope is fixed on a nylon mesh belt 11 wrapping the water bag, and the other end of the rope is fixed on a cast-in-place beam flange plate bracket system (a viaduct cast-in-place beam bracket system), so that the water bag 1 is always kept stable in the water adding process (shown in figure 1); before water is injected into the water bag 1, a simple bracket inclined bridge is erected, so that a water injection pipe of the water bag can be conveniently led to a bridge floor, and the water pipe is prevented from being broken due to overlarge stress in the water injection process;
the water bag is used for prepressing, the whole compression resistance of the support is verified to meet the design requirement, and meanwhile, the inelastic deformation is eliminated.
As shown in fig. 2, the viaduct cast-in-place beam support system comprises a bowl opening support 201, and the cross braces 202 are connected and fixed with the bowl opening support 201 through fasteners, so as to ensure the integrity and stability of the support system; the top of the vertical rod of the bowl mouth support is provided with an adjustable support jacking 204 so as to control the elevation of the bottom die; double-spliced phi 48 multiplied by 3mm steel pipes 205 are transversely arranged on the support top support 204, the distance between the double-spliced phi 48 multiplied by 3mm steel pipes corresponds to that of the vertical rods, 10 multiplied by 10cm square timbers 206 with the distance of 30cm are longitudinally laid on the support top support, and binding and fixing are carried out by using No. 10 iron wires; a 15mm bamboo plywood bottom die 207 is arranged on the square timber 206 and is fixed by iron nails; 1.5m safety protection railing 203 is fixed on bowl mouth support 201 with the fastener, and the edge protection facility prevents that the object from falling as facing, ensures construction safety.
By testing the elastic deformation and the inelastic deformation values of the support, the pre-camber of the support is calculated according to the measured data, and a reliable basis is provided for the elevation of the vertical mold. The strength, rigidity and stability of the structure are tested by simulating the weight, so that the foundation settlement is eliminated and the inelastic deformation of the erected support is eliminated. And the weight is simulated to be used as a basis for controlling the construction elevation of the box girder support.
Claims (1)
1. Cast-in-place roof beam support system water bag pre-compaction construction equipment of overpass, its characterized in that: the viaduct cast-in-place box girder comprises water bags, wherein the water bags are sequentially arranged from the lower end to the upper end of a bottom plate of the viaduct cast-in-place box girder; the outlet of the water bag is arranged at the low end, and the water inlet is arranged at the high end; the water bag is connected with a water source pipeline through a water pipe and is provided with a water pump and a shunt valve;
the arrangement of the water bag corresponds to the actual stress state of the cast-in-place beam bracket of the viaduct, and the cast-in-place beam bracket of the viaduct is pre-pressed according to 1.2 times of the total weight of the self load of the cast-in-place concrete; 5-10 sand bags are distributed around each water bag; the water pipe is laid on the simple bracket inclined bridge; the outer surface of each water bag is completely wrapped by a nylon mesh belt for fixation, four corners of the top of each water bag are respectively provided with a rope, one end of each rope is fixed on the nylon mesh wrapping the water bag, and the other end of each rope is fixed on a cast-in-place beam flange plate support system for stabilization in the water adding process.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047013A (en) * | 2021-11-17 | 2022-02-15 | 山东高速工程建设集团有限公司 | Pre-pressed water bag of viaduct cast-in-place beam support system and construction process thereof |
| CN114427220A (en) * | 2022-03-04 | 2022-05-03 | 中电建十一局工程有限公司 | Porous arch bridge water bag prepressing construction method |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047013A (en) * | 2021-11-17 | 2022-02-15 | 山东高速工程建设集团有限公司 | Pre-pressed water bag of viaduct cast-in-place beam support system and construction process thereof |
| CN114427220A (en) * | 2022-03-04 | 2022-05-03 | 中电建十一局工程有限公司 | Porous arch bridge water bag prepressing construction method |
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Inventor after: Hao Yufeng Inventor after: Zhang Ruizhi Inventor after: Li Wenbing Inventor before: Hao Yufeng Inventor before: Zhang Ruizhi Inventor before: Li Wenbing |