CN114808733B - Highway continuous rigid frame bridge side span straight line section cast-in-situ construction method - Google Patents
Highway continuous rigid frame bridge side span straight line section cast-in-situ construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 49
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 47
- 238000003756 stirring Methods 0.000 claims abstract description 45
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- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 13
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- 229910000831 Steel Inorganic materials 0.000 claims description 73
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- 239000002994 raw material Substances 0.000 claims description 26
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Abstract
The invention relates to the technical field of continuous rigid frame construction, in particular to a continuous rigid frame bridge side span straight line section pouring construction method, which comprises the following steps that a hole is reserved at the pier top; step two, mounting a bracket system; step three: installing a template system; step four: installing a reinforcing steel bar and a prestressed pipeline; and fifthly, casting concrete in the cast-in-situ section. According to the invention, a traditional bracket and platform cast-in-situ scheme is abandoned, the lower bearing type bailey cantilever bracket is adopted for construction, the bottom template and the outer side template are modified by adopting the existing template, the inner side template of the box is assembled by adopting the small rigid template and the bamboo plywood, in the concrete casting process, the precast blocks are adopted to press and weigh, the asymmetric casting of the side span straight line section is realized, the construction cost is reduced, the operability is strong, the safety is obviously improved, in addition, the stirring speed of the concrete and the adding speed of the concrete are regulated according to the slump of the concrete in the fifth step, and the casting speed and the casting quality of the concrete are improved.
Description
Technical Field
The invention relates to the technical field of continuous rigid frame construction, in particular to a highway continuous rigid frame bridge side span straight line segment cast-in-situ construction method.
Background
Along with the rapid development of economy, the construction quantity of expressways in China is increased year by year, the continuous rigid frame bridge plays a role in mountain bridge construction, can bear larger bending (forward direction) and torsion (transverse direction) resistance, and is convenient to construct and good in overall performance; because of these advantages, continuous rigid frame bridges are widely applied to bridges in China, however, due to the construction specificity of the bridges, when foundation conditions of side span foundation are poor, pier bodies are higher, and the bridge spans water areas or soft foundations, the traditional bracket folding mode is adopted, construction cost and difficulty are obviously increased, and high safety risks exist.
Chinese patent publication No. CN111395167B discloses a construction method of a continuous rigid frame bridge, which comprises N piers which are sequentially arranged, wherein 0# blocks on the piers comprise A0 class and B0 class, and the construction method comprises the following steps: constructing pile foundations, bearing platforms and pier shafts; setting up 0# block brackets for the middle N-2 piers, and respectively constructing corresponding A0 type 0 and B0 type 0# blocks; dismantling A0 # block bracket, symmetrically assembling hanging baskets on both sides of an A0 type 0# block and a B0 type 0# block, and erecting a side span straight line section cast-in-situ bracket; sequentially cantilever symmetrically constructing main beam sections to main beam maximum cantilever sections; gradually constructing closure sections according to the principle of side span and middle span to finish girder closure; cutting off a temporary filling device between gaps after gaps between adjacent side spans of the side pier and the B0 type 0# block are closed, and simultaneously cutting off temporary tensioning prestress of the side spans; dismantling the hanging basket, and performing working methods such as bridge deck paving and the like; it follows that the industry has the following problems: the side span straight line section pouring has the advantages of high construction difficulty, high cost and low safety coefficient under certain conditions, and in the concrete pouring process, the stirring speed of the concrete and the injection speed of the concrete cannot be dynamically regulated and controlled according to the slump of the concrete.
Disclosure of Invention
Therefore, the invention provides a highway continuous rigid frame bridge side span straight line section cast-in-situ construction method, which is used for solving the problems that in the prior art, the construction difficulty is high, the cost is high, the safety coefficient is low, and in the concrete pouring process, the stirring speed of concrete and the injection speed of concrete cannot be dynamically regulated and controlled according to the slump of the concrete.
In order to achieve the aim, the invention provides the technical scheme that the side-to-side straight line segment cast-in-situ construction method of the continuous rigid frame bridge of the expressway comprises the following steps,
Step S1, reserving holes on the pier tops;
S2, installing a bracket system;
S3, installing a template system;
S4, installing the reinforcing steel bars and the prestressed pipelines;
S5, casting concrete of the cast-in-situ section;
In the steps S1 to S2, a PVC pipe is adopted to reserve a vertical hole on a transition pier, a Bailey beam is used as a main stress member of a suspension splicing bracket, finish rolling deformed steel bars are used as anchoring rods to penetrate through the reserved hole and are connected with the Bailey beam, after the Bailey beam is installed, 3 double-spliced 56c I-steel beams are anchored below the Bailey beam cantilever by adopting I-steel and anchoring nuts, and the weight and construction load of cast-in-situ section concrete are born; after the suspended casting system is erected, the suspended casting system is vertically fastened by adopting a hydraulic jack pretensioning method to eliminate inelastic deformation, and a balancing weight is placed on one side of the bailey beam far away from the suspended casting system by adopting a lever principle, so that the risk of overturning of the bailey beam cantilever bracket system is prevented;
In the step S3, the side span cast-in-situ section template consists of an outer side die, a bottom die, an inner die and an end die, wherein the outer die, the bottom die and the inner die are all mounted by thick bamboo plywood in a blocking, lifting and installing manner; the template system is assembled according to the structural section, and the chamfering position of the internal mold is formed by adopting a bamboo plywood; the inner die is connected with the outer die into a whole through a pair of pull rods, is reinforced by adopting transverse double-row steel pipes, and is provided with a water outlet at the lowest part of the bottom die for leading out accumulated water;
In the step S4, the steel bars are manufactured into semi-finished products after being intensively discharged in a processing field, and are transported to the field for binding, and the steel bar binding is carried out twice;
In the step S5, the control module can compare the actual slump of the concrete with the preset slump of the concrete, and determine whether to adjust the stirring speed of the concrete and the adding speed of the concrete according to the slump of the concrete, so as to improve the pouring speed and the pouring quality of the concrete.
Further, the step S1 includes, when the transitional pier is constructed to the capping beam, embedding two rows of PVC pipes on the capping beam, and for each PVC pipe in any row of PVC pipes, sequentially increasing the row distance from the outermost side of the capping beam top to the inner side, and vertically embedding the PVC pipes.
Further, the step S2 includes:
a, preparing construction, namely checking whether collision exists between the front section of the basket hanging platform and the beam of the cast-in-situ section before the basket hanging is moved forward during construction on the beam section, and dismantling the front section of the basket hanging platform when collision exists between the front section of the basket hanging platform and the beam of the cast-in-situ section; when the front end of the basket hanging platform and the cast-in-situ section beam do not collide, preparing for the next operation;
b, hoisting the bailey beams by a tower crane, fastening two groups of cantilever bailey beams on the left side and the right side, dividing a plurality of bearing bailey beams into a group, connecting each two bearing bailey beams into a group by adopting a supporting frame, connecting the top surfaces of the bailey beams into a whole by adopting channel steel, and connecting an anchor pull rod and the bailey beams through an anchor shoulder pole;
c, installing a bottom cross beam and a longitudinal distribution beam, and after the bailey beam is hoisted and installed, anchoring 3 double-spliced 56c I-steel cross beams below the bailey beam cantilever by using finish-rolled deformed steel bars, double-spliced 56b I-steel and upper and lower double-layer anchor nuts to bear the weight and construction load of cast-in-situ section concrete;
d, vertically fastening the suspension casting system, and after the suspension casting system is erected, vertically fastening the suspension casting system by adopting a hydraulic jack method to eliminate inelastic deformation;
e, after the installation of the cantilever bracket system of the bailey beam is completed, placing the balancing weight on one side far away from the cantilever system, and preventing the bailey beam from overturning by utilizing the lever principle.
Further, before the bailey beam is hoisted, a steel plate is arranged at the intersection of the front fulcrum of the bailey beam and the capping beam so as to prevent the damage to the concrete at the front end of the capping beam in the construction process; and no gap is formed between the two channel steel vertical bars and the channel steel vertical bar is arranged between the top surface and the bottom surface of the bailey beam so as to eliminate the local overstretch of the bailey beam.
Further, in the fourth step, the reinforcement binding is performed twice:
the first steel bar installation step is that a1, the floor layer steel bar binding is carried out, b1, the web plate and the pier top solid section steel bar binding is carried out, c1, the vertical prestress steel bar fixing is carried out;
the second reinforcing steel bar installation step is: a2, binding reinforcing steel bars at the bottom layer of the top plate after the top plate template is installed, b2, installing longitudinal and transverse prestressed pipelines of the top plate, and c, binding reinforcing steel bars at the top layer of the top plate.
Further, in the step S5, during the casting process of the cast-in-situ section concrete, the control module compares the slump K of the used concrete with the slump Kq of the standard concrete preset in the control module:
When K is larger than Kq, the control module judges that the slump of the concrete is larger and calculates a slump difference value delta Ka, delta Ka=K-Kq;
When K is smaller than Kq, the control module judges that the slump of the concrete is smaller and calculates a slump difference delta Kb, delta Kb=Kq-K;
when k=kq, the control module determines that the slump of the concrete exactly meets the criteria.
Further, a concrete slump reference difference value delta K is arranged in the control module, and the concrete slump reference difference value delta K is compared with a slump difference value delta Ka and a slump difference value delta Kb:
when DeltaKa is less than or equal to DeltaK, the control module judges that the slump difference value of the concrete is in a reasonable range, and the slump of the concrete meets the standard;
When DeltaKa is more than DeltaK, the control module judges that the slump difference value of the concrete is not in a reasonable range, and further adjusts the stirring speed and the injection speed of the concrete;
when the delta Kb is less than or equal to delta K, the control module judges that the slump difference value of the concrete is in a reasonable range, and the slump of the concrete meets the standard;
When delta Kb is larger than delta K, the control module judges that the slump difference value of the concrete is not in a reasonable range, and further adjusts the stirring speed and the injection speed of the concrete.
Further, when the concrete slump does not meet the standard, the control module is provided with a concrete slump matrix K0, a concrete slump-to-concrete stirring speed adjusting parameter matrix J0 and a concrete slump-to-concrete injection speed adjusting parameter Z0;
For the concrete slump matrixes K0 and K0 (K1, K2, K3 and K4), wherein K1 is a first preset concrete slump, K2 is a second preset concrete slump, K3 is a third preset concrete slump, and K4 is a fourth preset concrete slump, and the slump values are sequentially increased;
for the concrete slump to concrete mixing speed adjustment parameter matrixes J0 and J0 (J1 and J2), wherein J1 is a first preset concrete slump to concrete mixing speed adjustment parameter, and J2 is a second preset concrete slump to concrete mixing speed adjustment parameter;
For the concrete slump to concrete injection speed adjustment parameter matrixes Z0 and Z0 (Z1 and Z2), wherein Z1 is a first preset concrete slump to concrete injection speed adjustment parameter, and Z2 is a second preset concrete slump to concrete injection speed adjustment parameter;
The control module compares the concrete slump K with parameters in a concrete slump matrix K0:
When K1 is more than K and less than or equal to K2, J1 is selected as a concrete stirring speed adjusting parameter; z1 is taken as a concrete injection speed adjusting parameter;
when K2 is more than K and less than or equal to K3, the stirring speed and the injection speed of the concrete are not adjusted according to the slump of the concrete;
when K3 is more than K and less than or equal to K4, J2 is selected as a concrete stirring speed adjusting parameter; z2 is used as a concrete injection rate adjustment parameter.
Further, when the stirring speed of the concrete and the injection speed of the concrete are required to be adjusted according to the slump of the concrete, the control module records the initial stirring speed A of the concrete and records the initial injection speed B of the concrete;
and Jp is selected as a concrete mixing speed adjusting parameter, and Zp is selected as a concrete injection speed, wherein p=1, 2;
the adjusted stirring speed of the concrete is a ', a' =a×jp;
the adjusted concrete injection speed was B ', B' =b×zp.
Further, when the concrete slump is not in the range of K1 to K4, judging that the concrete slump K is unqualified and adjusting the concrete slump K:
When K is less than or equal to K1, the control module judges that the slump of the concrete is too small, calculates a slump difference delta Ka, delta Ka=K3-K, adds a first concrete raw material with the amount L into a unit volume of concrete, wherein L=delta Ka×l, i is a compensation parameter added to the first concrete raw material for the slump difference, after the first concrete raw material is added, the concrete is stirred until the first concrete raw material is uniformly mixed with the concrete, the slump K ' is detected, when K1 is less than K ' and less than or equal to K4, the stirring speed A ' of the concrete and the injection speed B ' of the concrete are regulated according to K ', and when K ' is still not within the range of K1-K4, the operation is repeated until K1 is less than K ' and less than or equal to K4;
When K is larger than K4, the control module judges that the slump of the concrete is overlarge, calculates a slump difference delta Kb, delta Kb=K-K2, adds a second concrete raw material with the amount of M into a unit volume of concrete, wherein M=delta Kb×m, the M is a compensation parameter for the addition of the slump difference to the second concrete raw material, after the addition of the second concrete raw material is finished, the concrete is stirred until the second concrete raw material is uniformly mixed with the concrete, the slump K ' of the concrete at the moment is detected, when K1 is smaller than K ' and smaller than K4, the stirring speed A ' of the concrete and the injection speed B ' of the concrete are regulated according to K ', and when K ' is still not in the range of K1-K4, the operation is repeated until K1 is smaller than K ' and smaller than K4.
Compared with the prior art, the invention has the beneficial effects that,
The bracket system is economical in material selection and high in turnover utilization rate. The selected materials are materials such as I-steel, bailey beam, finish rolling screw steel, wood template and the like which are commonly used in engineering, the hoisting is quick, the leasing cost is low, and the manufacturing cost is low.
The assembly is simple, and the construction efficiency is high; the support bearing system adopts the bailey beam assembly as a main bearing rod piece, a PVC pipe is embedded in the capping beam during pouring, finish rolling deformed steel bars penetrate through the PVC pipe and are connected with the spliced bailey beam, all rod members are connected through anchor beams, a side span concrete pouring platform is erected on the bearing rod piece, and the system erection speed is obviously accelerated.
The hoisting is light and the safety is high. Compared with the method that a bracket is arranged on a pier and a platform is erected on the bracket, all rod members required by the lower bearing type bailey beam cantilever bracket system are light, the lifting weight is light, the hoisting is quick, the suspension casting system is assembled at the pier top, the safety risk is obviously reduced, and the safety performance is obviously improved.
In the pouring process of the concrete, firstly, comparing the slump of the concrete with the standard slump of the concrete, judging whether the difference value between the slump of the concrete and the standard slump of the concrete is within a reasonable range, when the difference value between the slump of the concrete and the standard slump of the concrete is within the reasonable range, indicating that the concrete is qualified, and when the difference value between the slump of the concrete and the standard slump of the concrete is not within the reasonable range, indicating that the concrete is unqualified; when the concrete is unqualified, the control module adjusts the adding speed of the concrete and the stirring speed of the concrete according to the slump of the concrete; the control module is provided with a concrete slump matrix, a parameter matrix for adjusting the concrete mixing speed by the concrete slump and a parameter matrix for adjusting the concrete injection speed by the concrete slump;
Further, the control module compares the actual slump of the concrete with parameters in a concrete slump matrix, and when the actual slump of the concrete is within the range of the concrete slump matrix, the control module selects proper adjusting parameters to adjust the stirring speed of the concrete and the injection speed of the concrete; when the actual slump of the concrete is not in the range of the concrete slump matrix, the control module judges whether the concrete slump is too large or too small, when the concrete slump is too large, the control module adds a first concrete raw material into the concrete in unit volume according to the difference value of the concrete slump and the standard concrete slump, after the concrete is uniformly stirred, the concrete slump is detected again, when the concrete slump is in the range of the concrete slump matrix, the concrete adding speed and the stirring speed are regulated according to the regulated concrete slump, when the concrete slump is still not in the range of the concrete slump matrix, the operation is repeated until the concrete slump is in the range of the concrete slump matrix, and through the method, the dynamic regulation and control of the concrete pouring process are realized, the manual participation is reduced, and the concrete pouring speed and quality can be effectively improved.
Drawings
FIG. 1 is a construction flow chart of a highway continuous rigid frame bridge side span straight line segment cast-in-situ construction method according to the invention;
FIG. 2 is a specific operation flow chart of the method for cast-in-situ construction of the side span straight line segment of the continuous rigid frame bridge of the expressway;
FIG. 3 is a schematic cross-sectional view of a highway continuous rigid frame bridge side span cast-in-situ section support system design according to the present invention;
FIG. 4 is a schematic view of a longitudinal section of a highway continuous rigid frame bridge side span cast-in-situ section support system design according to the present invention.
In the figure: 1. balancing weight; 2. a first 32 finish rolling deformed steel bar; 3. a thick steel plate; 4. double-spliced 32b I-steel; 5. double-spliced 56c I-steel; 6. an anchor beam; 7. second 32 finish rolling deformed steel bars; 8. an anchor beam; 9. a steel template; 10. double-spliced 56c I-steel; 11. double-spliced 36b I-steel.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, which is a construction flow chart of a method for cast-in-situ construction of a side span straight line segment of a continuous steel bridge of a highway in this embodiment, fig. 2, which is a specific flow chart of a method for cast-in-situ construction of a side span straight line segment of a continuous steel bridge of a highway in this embodiment, comprises the following steps,
Step S1, reserving holes on the pier tops;
S2, installing a bracket system;
S3, installing a template system;
S4, installing the reinforcing steel bars and the prestressed pipelines;
S5, casting concrete of the cast-in-situ section;
In the steps S1 to S2, a PVC pipe is adopted to reserve a vertical hole on a transition pier, a bailey beam is used as a main stress member of a suspension splicing bracket, a first 32 finish rolling deformed steel bar 2 is used as an anchoring rod to penetrate through the reserved hole and be connected with the bailey beam, four groups of double-spliced 56c I-steel 10 are arranged on a cast-in-situ section suspension transverse bridge, a bottom plate longitudinal beam adopts double-spliced 32b I-steel 4, and after the bailey beam is installed, 3 double-spliced 56c I-steel 5 are anchored below a bailey beam cantilever by adopting a second 32 finish rolling deformed steel bar 7 to bear the weight and construction load of cast-in-situ section concrete; an anchor beam 8 is arranged on the upper surface of the bailey beam cantilever bracket, an anchor beam 6 is arranged on the lower surface, after the cantilever casting system is erected, the cantilever casting system is vertically fastened by adopting a hydraulic jack pretensioning method, the method comprises the steps of eliminating inelastic deformation, and placing a balancing weight 1 on one side of the bailey beam far away from a cantilever system by adopting a lever principle so as to prevent the bailey beam cantilever bracket system from overturning; in the step S3, a rigid template 9 is adopted as an end mould for the side span cast-in-situ section template;
In the step S4, the steel bars are manufactured into semi-finished products after being intensively discharged in a processing field, and are transported to the field for binding, and the steel bar binding is carried out twice;
In the step S5, the control module can compare the actual slump of the concrete with the preset slump of the concrete, and determine whether to adjust the stirring speed of the concrete and the adding speed of the concrete according to the slump of the concrete, so as to improve the pouring speed and the pouring quality of the concrete.
Further, as shown in fig. 3, a schematic cross-sectional view of a bracket system design of a continuous steel bridge side span straight line segment cast-in-situ construction method for a highway in the embodiment is shown; fig. 4 is a schematic longitudinal section view of a design of a bracket system of a continuous rigid frame side span straight line section cast-in-situ construction method of a highway in the embodiment;
step S1 includes, when the transition mound is under construction to the bent cap, pre-buried two rows of PVC pipes on the bent cap, PVC pipe list is arranged, increases in proper order inwards row distance from the outermost side of bent cap top, and the PVC pipe is vertical pre-buried.
The row distance of the two rows of PVC pipes is 24cm, the pipe diameter of the PVC pipes is 50mm, the length of the PVC pipes is 220cm, and the arrangement of a single row is 67cm, 102cm, 137cm, 172cm and 192cm from the outermost side of the top of the bent cap.
Further, the step S2 includes:
a, preparing construction, namely checking whether collision exists between the front section of the basket hanging platform and the beam of the cast-in-situ section before the basket hanging is moved forward during construction on the beam section, and dismantling the front section of the basket hanging platform when collision exists between the front section of the basket hanging platform and the beam of the cast-in-situ section; when the front end of the basket hanging platform and the cast-in-situ section beam do not collide, preparing for the next operation;
b, hoisting the bailey beams by a tower crane, fastening two groups of cantilever bailey beams on the left side and the right side, dividing a plurality of bearing bailey beams into a group, connecting each two bearing bailey beams into a group by adopting a supporting frame, connecting the top surfaces of the bailey beams into a whole by adopting channel steel, and connecting an anchor pull rod and the bailey beams through an anchor shoulder pole;
5 overhanging bailey beams/group and 9m long, wherein each group of 5 bearing bailey beams is connected into a group by adopting a 22.5cm supporting frame.
C, installing a bottom cross beam and a longitudinal distribution beam, and after the bailey beam is hoisted and installed, anchoring 3 double-spliced 56c I-steel 5 cross beams below the bailey beam cantilever by using finish-rolled deformed steel bars 7, double-spliced 36b I-steel 11 and upper and lower double-layer anchor nuts to bear the weight and construction load of cast-in-situ section concrete;
The overlapping length of the I-steel is 18cm, and the spacing between square timber and the I-steel is 10cm.
D, vertically fastening the suspension casting system, and after the suspension casting system is erected, vertically fastening the suspension casting system by adopting a hydraulic jack method to eliminate inelastic deformation;
e, after the installation of the cantilever bracket system of the bailey beam is completed, placing the balancing weight 1 on one side far away from the cantilever system, and preventing the bailey beam from overturning danger by utilizing the lever principle.
The single-side counterweight 5t can also be replaced by an equivalent weight material, so that the tail weight is ensured to be not less than 10t.
Further, before the bailey beam is hoisted, a thick steel plate 3 is arranged at the intersection of the front fulcrum of the bailey beam and the bent cap so as to prevent the concrete at the front end of the bent cap from being damaged in the construction process; and two channel steel vertical rods are arranged between the top surface and the bottom surface of the bailey beam, and gaps are avoided between the channel steel vertical rods so as to eliminate the local overstretch of the bailey beam.
The length of the side span cast-in-situ section is 5.7m, and the thickness of the steel plate is 25mm.
Further, in the fourth step, the reinforcement binding is performed twice:
the first steel bar installation step is that a1, the floor layer steel bar binding is carried out, b1, the web plate and the pier top solid section steel bar binding is carried out, c1, the vertical prestress steel bar fixing is carried out;
the second reinforcing steel bar installation step is: a2, binding reinforcing steel bars at the bottom layer of the top plate after the top plate template is installed, b2, installing longitudinal and transverse prestressed pipelines of the top plate, and c, binding reinforcing steel bars at the top layer of the top plate.
The bracket system of the method has the advantages of economical material selection and high turnover utilization rate. The selected materials are materials such as I-steel, bailey beam, finish rolling screw steel, wood template and the like which are commonly used in engineering, the hoisting is quick, the leasing cost is low, and the manufacturing cost is low.
The assembly is simple, and the construction efficiency is high; the support bearing system adopts the bailey beam assembly as a main bearing rod piece, a PVC pipe is embedded in the capping beam during pouring, finish rolling deformed steel bars penetrate through the PVC pipe and are connected with the spliced bailey beam, all rod members are connected through anchor beams, a side span concrete pouring platform is erected on the bearing rod piece, and the system erection speed is obviously accelerated.
The hoisting is light and the safety is high. Compared with the method that a bracket is arranged on a pier and a platform is erected on the bracket, all rod members required by the lower bearing type bailey beam cantilever bracket system are light, the lifting weight is light, the hoisting is quick, the suspension casting system is assembled at the pier top, the safety risk is obviously reduced, and the safety performance is obviously improved.
Further, in the step S5, during the casting process of the cast-in-situ section concrete, the control module compares the slump K of the used concrete with the slump Kq of the standard concrete preset in the control module:
When K is larger than Kq, the control module judges that the slump of the concrete is larger and calculates a slump difference value delta Ka, delta Ka=K-Kq;
When K is smaller than Kq, the control module judges that the slump of the concrete is smaller and calculates a slump difference delta Kb, delta Kb=Kq-K;
when k=kq, the control module determines that the slump of the concrete exactly meets the criteria.
Further, a concrete slump reference difference value delta K is arranged in the control module, and the concrete slump reference difference value delta K is compared with a slump difference value delta Ka and a slump difference value delta Kb:
when DeltaKa is less than or equal to DeltaK, the control module judges that the slump difference value of the concrete is in a reasonable range, and the slump of the concrete meets the standard;
When DeltaKa is more than DeltaK, the control module judges that the slump difference value of the concrete is not in a reasonable range, and further adjusts the stirring speed and the injection speed of the concrete;
when the delta Kb is less than or equal to delta K, the control module judges that the slump difference value of the concrete is in a reasonable range, and the slump of the concrete meets the standard;
When delta Kb is larger than delta K, the control module judges that the slump difference value of the concrete is not in a reasonable range, and further adjusts the stirring speed and the injection speed of the concrete.
Further, when the concrete slump does not meet the standard, the control module is provided with a concrete slump matrix K0, a concrete slump-to-concrete stirring speed adjusting parameter matrix J0 and a concrete slump-to-concrete injection speed adjusting parameter Z0;
For the concrete slump matrixes K0 and K0 (K1, K2, K3 and K4), wherein K1 is a first preset concrete slump, K2 is a second preset concrete slump, K3 is a third preset concrete slump, and K4 is a fourth preset concrete slump, and the slump values are sequentially increased;
for the concrete slump to concrete mixing speed adjustment parameter matrixes J0 and J0 (J1 and J2), wherein J1 is a first preset concrete slump to concrete mixing speed adjustment parameter, and J2 is a second preset concrete slump to concrete mixing speed adjustment parameter;
For the concrete slump to concrete injection speed adjustment parameter matrixes Z0 and Z0 (Z1 and Z2), wherein Z1 is a first preset concrete slump to concrete injection speed adjustment parameter, and Z2 is a second preset concrete slump to concrete injection speed adjustment parameter;
The control module compares the concrete slump K with parameters in a concrete slump matrix K0:
When K1 is more than K and less than or equal to K2, J1 is selected as a concrete stirring speed adjusting parameter; z1 is taken as a concrete injection speed adjusting parameter;
when K2 is more than K and less than or equal to K3, the stirring speed and the injection speed of the concrete are not adjusted according to the slump of the concrete;
when K3 is more than K and less than or equal to K4, J2 is selected as a concrete stirring speed adjusting parameter; z2 is used as a concrete injection rate adjustment parameter.
Further, when the stirring speed of the concrete and the injection speed of the concrete are required to be adjusted according to the slump of the concrete, the control module records the initial stirring speed A of the concrete and records the initial injection speed B of the concrete;
and Jp is selected as a concrete mixing speed adjusting parameter, and Zp is selected as a concrete injection speed, wherein p=1, 2;
the adjusted stirring speed of the concrete is a ', a' =a×jp;
the adjusted concrete injection speed was B ', B' =b×zp.
Further, when the concrete slump is not in the range of K1 to K4, judging that the concrete slump K is unqualified and adjusting the concrete slump K:
When K is less than or equal to K1, the control module judges that the slump of the concrete is too small, calculates a slump difference delta Ka, delta Ka=K3-K, adds a first concrete raw material with the amount L into a unit volume of concrete, wherein L=delta Ka×l, i is a compensation parameter added to the first concrete raw material for the slump difference, after the first concrete raw material is added, the concrete is stirred until the first concrete raw material is uniformly mixed with the concrete, the slump K ' is detected, when K1 is less than K ' and less than or equal to K4, the stirring speed A ' of the concrete and the injection speed B ' of the concrete are regulated according to K ', and when K ' is still not within the range of K1-K4, the operation is repeated until K1 is less than K ' and less than or equal to K4;
When K is larger than K4, the control module judges that the slump of the concrete is overlarge, calculates a slump difference delta Kb, delta Kb=K-K2, adds a second concrete raw material with the amount of M into a unit volume of concrete, wherein M=delta Kb×m, the M is a compensation parameter for the addition of the slump difference to the second concrete raw material, after the addition of the second concrete raw material is finished, the concrete is stirred until the second concrete raw material is uniformly mixed with the concrete, the slump K ' of the concrete at the moment is detected, when K1 is smaller than K ' and smaller than K4, the stirring speed A ' of the concrete and the injection speed B ' of the concrete are regulated according to K ', and when K ' is still not in the range of K1-K4, the operation is repeated until K1 is smaller than K ' and smaller than K4.
In the pouring process of the concrete, firstly, comparing the slump of the concrete with the standard slump of the concrete, judging whether the difference value between the slump of the concrete and the standard slump of the concrete is within a reasonable range, when the difference value between the slump of the concrete and the standard slump of the concrete is within the reasonable range, indicating that the concrete is qualified, and when the difference value between the slump of the concrete and the standard slump of the concrete is not within the reasonable range, indicating that the concrete is unqualified; when the concrete is unqualified, the control module adjusts the adding speed of the concrete and the stirring speed of the concrete according to the slump of the concrete; the control module is provided with a concrete slump matrix, a parameter matrix for adjusting the concrete mixing speed by the concrete slump and a parameter matrix for adjusting the concrete injection speed by the concrete slump;
Further, the control module compares the actual slump of the concrete with parameters in a concrete slump matrix, and when the actual slump of the concrete is within the range of the concrete slump matrix, the control module selects proper adjusting parameters to adjust the stirring speed of the concrete and the injection speed of the concrete; when the actual slump of the concrete is not in the range of the concrete slump matrix, the control module judges whether the concrete slump is too large or too small, when the concrete slump is too large, the control module adds a first concrete raw material into the concrete in unit volume according to the difference value of the concrete slump and the standard concrete slump, after the concrete is uniformly stirred, the concrete slump is detected again, when the concrete slump is in the range of the concrete slump matrix, the concrete adding speed and the stirring speed are regulated according to the regulated concrete slump, when the concrete slump is still not in the range of the concrete slump matrix, the operation is repeated until the concrete slump is in the range of the concrete slump matrix, by the method, the dynamic regulation and control of the concrete pouring process are realized, the manual participation is reduced, and the concrete pouring speed and the concrete pouring quality can be effectively improved
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A highway continuous rigid frame bridge side span straight line section cast-in-situ construction method is characterized by comprising the following steps of,
Step S1, reserving holes on the pier tops;
s2, installing a bracket system;
S3, installing a template system;
S4, installing the reinforcing steel bars and the prestressed pipelines;
S5, casting concrete of the cast-in-situ section;
In the steps S1 to S2, a PVC pipe is adopted to reserve a vertical hole on a transition pier, a Bailey beam is used as a main stress member of a suspension splicing bracket, finish rolling deformed steel bars are used as anchoring rods to penetrate through the reserved hole and are connected with the Bailey beam, after the Bailey beam is installed, 3 double-spliced 56c I-steel beams are anchored below the Bailey beam cantilever by adopting I-steel and anchoring nuts, and the weight and construction load of cast-in-situ section concrete are born; after the suspended casting system is erected, the suspended casting system is vertically fastened by adopting a hydraulic jack pretensioning method to eliminate inelastic deformation, and a balancing weight is placed on one side of the bailey beam far away from the suspended casting system by adopting a lever principle, so that the risk of overturning of the bailey beam cantilever bracket system is prevented;
in the step S3, a steel plate mould is adopted as an end mould in the side span cast-in-situ section mould plate;
In the step S4, the steel bars are manufactured into semi-finished products after being intensively discharged in a processing field, and are transported to the field for binding, and the steel bar binding is carried out twice;
in the step S5, the control module can compare the actual slump of the concrete with the preset slump of the concrete, and judge whether to adjust the stirring speed of the concrete and the adding speed of the concrete according to the slump of the concrete, so as to improve the pouring speed and the pouring quality of the concrete;
in the step S5, in the casting process of the cast-in-situ section concrete, the control module compares the slump K of the used concrete with the slump Kq of the standard concrete preset in the control module:
When K is larger than Kq, the control module judges that the slump of the concrete is larger and calculates a slump difference value, wherein Ka=K-Kq;
When K is smaller than Kq, the control module judges that the slump of the concrete is smaller and calculates a slump difference, namely, kb=Kq-K;
when k=kq, the control module determines that the slump of the concrete exactly meets the standard;
the control module is provided with a concrete slump reference difference fatter K, and the concrete slump reference difference fatter K is compared with a slump difference fatter Ka and a slump difference fatter Kb:
When Ka is less than or equal to K, the control module judges that the slump difference value of the concrete is in a reasonable range, and the slump of the concrete meets the standard;
when Ka > -is K, the control module judges that the slump difference value of the concrete is not in a reasonable range, and further adjusts the stirring speed and the injection speed of the concrete;
When Kb is less than or equal to K, the control module judges that the slump difference value of the concrete is in a reasonable range, and the slump of the concrete meets the standard;
When Kb > -is equal to K, the control module judges that the slump difference value of the concrete is not in a reasonable range, and further adjusts the stirring speed and the injection speed of the concrete;
when the concrete slump does not meet the standard, the control module is provided with a concrete slump matrix K0, a concrete slump-to-concrete stirring speed adjusting parameter matrix J0 and a concrete slump-to-concrete injection speed adjusting parameter Z0;
For the concrete slump matrixes K0 and K0 (K1, K2, K3 and K4), wherein K1 is a first preset concrete slump, K2 is a second preset concrete slump, K3 is a third preset concrete slump, K4 is a fourth preset concrete slump, and the slump values are sequentially increased;
For the concrete slump to concrete mixing speed adjustment parameter matrixes J0 and J0 (J1 and J2), wherein J1 is a first preset concrete slump to concrete mixing speed adjustment parameter, and J2 is a second preset concrete slump to concrete mixing speed adjustment parameter;
for the concrete slump to concrete injection speed adjustment parameter matrixes Z0 and Z0 (Z1 and Z2), wherein Z1 is a first preset concrete slump to concrete injection speed adjustment parameter, and Z2 is a second preset concrete slump to concrete injection speed adjustment parameter;
The control module compares the concrete slump K with parameters in a concrete slump matrix K0:
When K1 is more than K and less than or equal to K2, J1 is selected as a concrete stirring speed adjusting parameter; z1 is taken as a concrete injection speed adjusting parameter;
when K2 is more than K and less than or equal to K3, the stirring speed and the injection speed of the concrete are not adjusted according to the slump of the concrete;
when K3 is more than K and less than or equal to K4, J2 is selected as a concrete stirring speed adjusting parameter; z2 is taken as a concrete injection speed adjusting parameter;
When the stirring speed of the concrete and the injection speed of the concrete are required to be adjusted according to the slump of the concrete, the control module records the initial stirring speed A of the concrete and records the initial injection speed B of the concrete;
And Jp is selected as a concrete mixing speed adjusting parameter, and Zp is selected as a concrete injection speed, wherein p=1, 2;
the adjusted stirring speed of the concrete is a ', a' =a×jp;
The adjusted concrete injection speed is B ', B' =b×zp;
when the concrete slump is not in the range of K1-K4, judging that the concrete slump K is unqualified and adjusting the concrete slump K:
When K is less than or equal to K1, the control module judges that the slump of the concrete is too small, calculates a slump difference delta Ka, delta Ka=K3-K, adds a first concrete raw material with the amount L into a unit volume of concrete, wherein L=delta Ka×l, i is a compensation parameter added to the first concrete raw material for the slump difference, after the first concrete raw material is added, the concrete is stirred until the first concrete raw material is uniformly mixed with the concrete, the slump K ' is detected, when K1 is less than K ' and less than or equal to K4, the stirring speed A ' of the concrete and the injection speed B ' of the concrete are regulated according to K ', and when K ' is still not within the range of K1-K4, the operation is repeated until K1 is less than K ' and less than or equal to K4;
When K is larger than K4, the control module judges that the slump of the concrete is overlarge, calculates a slump difference delta Kb, delta Kb=K-K2, adds a second concrete raw material with the amount of M into a unit volume of concrete, wherein M=delta Kb×m, the M is a compensation parameter for the addition of the slump difference to the second concrete raw material, after the addition of the second concrete raw material is finished, the concrete is stirred until the second concrete raw material is uniformly mixed with the concrete, the slump K ' of the concrete at the moment is detected, when K1 is smaller than K ' and smaller than K4, the stirring speed A ' of the concrete and the injection speed B ' of the concrete are regulated according to K ', and when K ' is still not in the range of K1-K4, the operation is repeated until K1 is smaller than K ' and smaller than K4.
2. The method for in-situ casting construction of the side span straight line segment of the continuous rigid frame bridge of the expressway according to claim 1, wherein the step S1 comprises the steps of embedding two rows of PVC pipes in the bent cap when the transition pier is constructed to the bent cap, wherein for each PVC pipe in any row of PVC pipes, the row spacing sequentially increases from the outermost side of the top of the bent cap to the inner side, and the PVC pipes are vertically embedded.
3. The method for in-situ casting construction of the side span straight line segment of the continuous rigid frame bridge of the expressway according to claim 1, wherein the step S2 comprises:
a, preparing construction, namely checking whether collision exists between the front section of the basket hanging platform and the beam of the cast-in-situ section before the basket hanging is moved forward during construction on the beam section, and dismantling the front section of the basket hanging platform when collision exists between the front section of the basket hanging platform and the beam of the cast-in-situ section; when the front end of the basket hanging platform and the cast-in-situ section beam do not collide, preparing for the next operation;
b, hoisting the bailey beams by a tower crane, fastening two groups of cantilever bailey beams on the left side and the right side, connecting each two bearing bailey beams into a group by adopting a support frame, connecting the top surfaces of the bailey beams into a whole by adopting channel steel, and connecting an anchor pull rod with the bailey beams by an anchor shoulder pole;
c, installing a bottom cross beam and a longitudinal distribution beam, and after the bailey beam is hoisted and installed, anchoring 3 double-spliced 56c I-steel cross beams below the bailey beam cantilever by using finish-rolled deformed steel bars, double-spliced 36b I-steel and upper and lower double-layer anchor nuts to bear the weight and construction load of cast-in-situ section concrete;
d, vertically fastening the suspension casting system, and after the suspension casting system is erected, vertically fastening the suspension casting system by adopting a hydraulic jack method to eliminate inelastic deformation;
e, after the installation of the cantilever bracket system of the bailey beam is completed, placing the balancing weight on one side far away from the cantilever system, and preventing the bailey beam from overturning by utilizing the lever principle.
4. The method for cast-in-situ construction of the side span straight line segment of the continuous rigid frame bridge of the expressway according to claim 3, wherein a steel plate is arranged at the intersection of the front pivot of the bailey beam and the capping beam before the bailey beam is hoisted, so as to prevent the damage to the concrete at the front end of the capping beam in the construction process; and two channel steel vertical rods are arranged between the top surface and the bottom surface of the bailey beam, and gaps are not reserved between the channel steel vertical rods so as to eliminate the local overstretch of the bailey beam.
5. The method for in-situ casting construction of the side span straight line segment of the continuous rigid frame bridge of the expressway according to claim 1, wherein the steel bar binding in the step S4 is performed twice:
the first steel bar installation step is that a1, the floor layer steel bar binding is carried out, b1, the web plate and the pier top solid section steel bar binding is carried out, c1, the vertical prestress steel bar fixing is carried out;
the second reinforcing steel bar installation step is: a2, binding reinforcing steel bars at the bottom layer of the top plate after the top plate template is installed, b2, installing longitudinal and transverse prestressed pipelines of the top plate, and c, binding reinforcing steel bars at the top layer of the top plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210534630.1A CN114808733B (en) | 2022-05-17 | Highway continuous rigid frame bridge side span straight line section cast-in-situ construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210534630.1A CN114808733B (en) | 2022-05-17 | Highway continuous rigid frame bridge side span straight line section cast-in-situ construction method |
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| Publication Number | Publication Date |
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| CN114808733A CN114808733A (en) | 2022-07-29 |
| CN114808733B true CN114808733B (en) | 2024-06-04 |
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