CN114808733A - Cast-in-place construction method for side span straight line segment of continuous rigid frame bridge of highway - Google Patents
Cast-in-place construction method for side span straight line segment of continuous rigid frame bridge of highway Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 52
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 74
- 239000010959 steel Substances 0.000 claims abstract description 74
- 238000003756 stirring Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims description 51
- 239000007924 injection Substances 0.000 claims description 51
- 239000011159 matrix material Substances 0.000 claims description 36
- 238000002156 mixing Methods 0.000 claims description 28
- 238000005266 casting Methods 0.000 claims description 26
- 239000002994 raw material Substances 0.000 claims description 26
- 239000000725 suspension Substances 0.000 claims description 23
- 238000004873 anchoring Methods 0.000 claims description 17
- 238000009434 installation Methods 0.000 claims description 9
- 238000011065 in-situ storage Methods 0.000 claims description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 7
- 239000011265 semifinished product Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract description 3
- 235000017491 Bambusa tulda Nutrition 0.000 abstract description 3
- 241001330002 Bambuseae Species 0.000 abstract description 3
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- 239000011425 bamboo Substances 0.000 abstract description 3
- 239000011120 plywood Substances 0.000 abstract description 3
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- 238000004519 manufacturing process Methods 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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Abstract
The invention relates to the technical field of continuous rigid frame construction, in particular to a pouring construction method for a side span straight line segment of a continuous rigid frame bridge, which comprises the following steps of reserving a hole at the top of a pier; step two, mounting a bracket system; step three: installing a template system; step four: installing steel bars and prestressed pipelines; and fifthly, pouring concrete in a cast-in-place section. The invention abandons the traditional corbel and platform cast-in-place scheme, adopts the bottom bearing type Bailey beam cantilever support for construction, refits the bottom template and the outer template by adopting the existing templates, assembles the template in the box chamber by adopting a small rigid mold and a bamboo plywood, adopts the weight of the precast block during the concrete pouring process, realizes the asymmetric pouring of the side span straight line segment, reduces the construction cost, has strong operability and obviously improves the safety, and adjusts the stirring speed of the concrete and the adding speed of the concrete according to the slump of the concrete in the step five, thereby improving the pouring speed and the pouring quality of the concrete.
Description
Technical Field
The invention relates to the technical field of continuous rigid frame construction, in particular to a cast-in-place construction method for a side span straight line section of a continuous rigid frame bridge of a highway.
Background
Along with the rapid development of economy, the construction amount of expressways in China also increases year by year, and the continuous rigid frame bridge plays a very important role in the construction of bridges in mountainous areas, can bear larger bending resistance (along the bridge direction) and torsion resistance (transverse bridge direction), and has convenient construction and good overall performance; due to the advantages, the continuous rigid frame bridge is widely applied to bridges in China, however, due to the particularity of bridge construction, when the side span foundation is poor in foundation condition, the pier body is high, and a water area or a soft foundation is spanned, the traditional support folding mode is adopted, so that the construction cost and difficulty are obviously increased, and high safety risk exists.
Chinese patent publication No. CN111395167B discloses a construction method of a continuous rigid frame bridge, which comprises N piers arranged in sequence, wherein a 0# block on each pier comprises A0 and B0, and the construction method comprises the following steps: constructing a pile foundation, a bearing platform and a pier body; setting 0# block supports for N-2 piers in the middle, and constructing corresponding A0-type and B0-type 0# blocks respectively; dismantling the 0# block bracket, symmetrically assembling hanging baskets on two sides of the A0 type 0# block and the B0 type 0# block, and erecting a side span straight-line segment cast-in-place bracket; constructing a main beam section to a main beam maximum cantilever section in a cantilever symmetry mode in sequence; constructing closure sections step by step according to the principle of side span and mid span to finish the closure of the main beam; cutting off a temporary filling device between gaps after the adjacent side spans of the side piers and the gaps between the B0 class 0# blocks are closed, and simultaneously shearing off the temporary tensioning prestress of the side spans; dismantling the hanging basket, and carrying out working methods such as bridge deck paving and the like; therefore, the following problems exist in the industry: the side span straight-line segment pouring has the advantages of high construction difficulty, high cost and low safety factor under certain conditions, and 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 in the concrete pouring process.
Disclosure of Invention
Therefore, the invention provides a cast-in-place construction method for a side span straight line section of a continuous rigid frame bridge of a highway, which is used for solving the problems that the construction difficulty is high, the cost is high, the safety coefficient is low, and 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 the concrete pouring process in the prior art.
In order to realize the aim, the invention provides the following technical scheme that the construction method for casting the side span and the side span straight line section of the continuous rigid frame bridge on the highway in situ comprises the following steps,
step S1, reserving holes on the pier top;
step S2, mounting a bracket system;
step S3, installing a template system;
step S4, installing the steel bars and the prestressed pipelines;
step S5, casting concrete in a cast-in-place section;
in the steps S1 to S2, PVC pipes are adopted to reserve vertical holes on transition piers, the Bailey beams are used as main stress members of the suspension splicing supports, finish-rolled deformed steel bars are used as anchoring rods to penetrate through the reserved holes to be connected with the Bailey beams, and after the Bailey beams are installed, I-beams and anchoring nuts are adopted to enable 3 double-spliced I-beam anchors to be arranged below the Bailey beam cantilever to bear the weight of cast-in-place section concrete and construction load; after the suspension system is built, the suspension 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 a Bailey beam close to a T beam by adopting a lever principle to prevent a Bailey beam cantilever support system from overturning dangers;
in the step S3, the side span cast-in-place section template consists of an outer side mold, a bottom mold, an inner mold and an end mold, wherein the outer mold, the bottom mold and the inner mold are respectively hoisted and installed in a block manner by thick bamboo plywood; the template system is assembled according to the structural section, and the chamfering position of the inner mold is manufactured by shaping a bamboo plywood; the inner die is connected with the outer die into a whole through a counter pull rod and reinforced by adopting a transverse double-row steel pipe, and the lowest part of the bottom die is provided with a water outlet for leading out accumulated water;
in the step S4, the reinforcing steel bars are manufactured into semi-finished products after being intensively blanked in a processing field, the semi-finished products are transported to the field for binding, and the binding of the reinforcing steel bars is carried out twice;
in 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 mixing 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 that when the transition pier is constructed to the bent cap, two rows of PVC pipes are embedded in the bent cap in advance, the PVC pipes are arranged in a single row, the row distances from the outermost side of the top of the beam cap to the inner side are sequentially increased, and the PVC pipes are vertically embedded.
Further, the step S2 includes:
a, construction preparation, namely, when a hanging basket is moved forwards during construction on a beam section, checking whether the hanging basket collides with a beam of a cast-in-place section, and when the front section of a hanging basket platform collides with the beam of the cast-in-place section, dismantling the front section of the hanging basket platform; when the front end of the cradle platform does not conflict with the beam of the cast-in-place section, preparing for the next operation;
b, hoisting the Bailey beams by using a tower crane, fastening two groups of cantilever Bailey beams at the longitudinal left side and the longitudinal right side, dividing a plurality of load-bearing Bailey beams into one group, connecting every two beams into one group by using a support frame, connecting the top surfaces of the Bailey beams into a whole by using channel steel, and connecting the anchoring pull rods and the Bailey beams by using anchoring carrying poles;
c, mounting the bottom cross beam and the longitudinal distribution beam, anchoring 3 double-spliced 56c I-steel cross beams below the cantilever of the Bailey beam by using finish-rolled deformed steel bars, double-spliced 56b I-steel and upper and lower double-layer anchoring nuts after the Bailey beam is hoisted and mounted, and bearing the weight of concrete at a cast-in-place section and construction load;
d, vertically fastening the suspension casting system, and after the suspension casting system is built, vertically fastening the suspension casting system by adopting a hydraulic jack method to eliminate inelastic deformation;
e, balancing weight of the suspension casting system, placing a balancing weight on one side close to the T-shaped beam after the installation of the Bailey beam cantilever support system is completed, and preventing the Bailey beam from overturning dangers by utilizing the lever principle.
Further, before the Bailey beam is hoisted, a steel plate is arranged at the intersection of the front supporting point of the Bailey beam and the beam cover, so that the concrete at the front end of the beam cover is prevented from being damaged in the construction process; and no gap is reserved between the two channel steel vertical bars of the channel steel vertical bar between the bottom surfaces of the top surfaces of the Bailey beams, so that the phenomenon that the local shearing of the Bailey beams is too large is eliminated.
Further, the reinforcement bar binding in the fourth step is performed in two times:
the first steel bar installation step is that a1, bottom plate stratum steel bar binding is carried out, b1, web and pier top solid section steel bar binding is carried out, and c1, vertical prestressed steel bar fixing is carried out;
the second steel bar installation step is: a2, after the top plate template is installed, binding the bottom layer steel bars of the top plate, b2, installing the longitudinal and transverse prestressed pipelines of the top plate, and c, binding the top layer steel bars of the top plate.
Further, in the step S5, in the cast-in-place concrete pouring process, the control module compares the slump K of the used concrete with a standard slump Kq preset in the control module:
when K is larger than Kq, the control module judges that the concrete slump is larger and calculates a slump difference value delta Ka, wherein delta Ka is K-Kq;
when K is smaller than Kq, the control module judges that the concrete slump is smaller and calculates a slump difference value delta Kb, wherein the delta Kb is Kq-K;
and when K is Kb, the control module judges that the slump of the concrete just meets the standard.
Further, a concrete slump reference difference value delta K is set 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 delta Ka is less than or equal to delta K, the control module judges that the slump difference of the concrete is within a reasonable range, and the slump of the concrete meets the standard;
when delta Ka is larger than delta K, the control module judges that the slump difference of the concrete is not in a reasonable range, and further adjusts the stirring speed and the injection speed of the concrete;
when delta Kb is less than or equal to delta K, the control module judges that the slump difference of the concrete is within a reasonable range, and the slump of the concrete meets the standard;
and when the delta Kb is larger than the delta K, the control module judges that the slump difference 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 controller is provided with a concrete slump matrix KO, a concrete slump to concrete mixing speed adjusting parameter matrix J0 and a concrete slump to concrete injection speed adjusting parameter ZO;
for the concrete humidity matrix K0, K0(K1, K2, K3, K4), where K1 is a first preset concrete humidity, K2 is a second preset concrete humidity, K3 is a third preset concrete humidity, and K4 is a fourth preset concrete humidity, the humidity values are sequentially increased;
a concrete mixing speed adjusting parameter matrix J0, J0(J1, J2) for concrete slump, wherein J1 is a first preset concrete slump to concrete mixing speed adjusting parameter, and J2 is a second preset concrete slump to concrete mixing speed adjusting parameter;
a concrete injection speed adjusting parameter matrix Z0, Z0(Z1, Z2) for concrete slump, wherein Z1 is a first preset concrete slump to concrete injection speed adjusting parameter, and Z2 is a second preset concrete slump to concrete injection speed adjusting parameter;
the control module compares the concrete slump K with parameters in the concrete slump matrix KO:
when K is more than K1 and less than or equal to K2, selecting J1 as a concrete stirring speed adjusting parameter; z1 is used as a concrete injection speed adjusting parameter;
when K is more than K2 and less than or equal to K3, the mixing speed and the injection speed of the concrete are not adjusted according to the slump of the concrete;
when K is more than K3 and less than or equal to K4, selecting J2 as a concrete stirring speed adjusting parameter; z2 is used as a concrete injection speed adjusting parameter.
Further, when the mixing speed of the concrete and the injection speed of the concrete need to be adjusted according to the slump of the concrete, the control device records the initial mixing speed A of the concrete and records the initial injection speed of the concrete as B;
selecting Jp as a concrete stirring speed adjusting parameter, and selecting Zp as a concrete injection speed, wherein p is 1 and 2;
the stirring speed of the adjusted concrete is A ', A' ═ A × Jp;
the adjusted concrete injection speed is B', B ═ B × Zp.
Further, 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 concrete slump is too small, calculates the slump difference value delta Ka, wherein delta Ka is K3-K, the first concrete raw material with the amount of L is added into the concrete of unit volume, L is delta Ka multiplied by L, and L is a compensation parameter added to the first concrete raw material by the concrete slump difference value, after the first concrete raw material is added, the concrete is stirred until the first concrete raw material and the concrete are uniformly mixed, the concrete slump K 'at the moment is detected, when K1 is less than or equal to K4, the stirring speed A' of the concrete and the injection speed B of the concrete are adjusted according to K ', and when K' is not in the range of K1-K4, the operation is repeated until K1 is less than or equal to K4;
when K is more than K4, the control module judges that the concrete slump is too large, calculates a slump difference value delta Kb, wherein delta Kb is K-K2, adds a second concrete raw material with the amount of M into the unit volume of concrete, wherein M is delta Kb multiplied by M, M is a compensation parameter of the slump difference value added to the second concrete raw material, stirs the concrete after the second concrete raw material is added until the second concrete raw material is uniformly mixed with the concrete, detects the concrete slump K ', adjusts the stirring speed A' of the concrete and the injection speed B of the concrete according to K 'when K1 is less than K' and less than K4, and repeats the operation until K1 is less than K 'and less than K4 when K' is not in the range of K1-K4.
Compared with the prior art, the invention has the advantages that,
the bracket system has the advantages of economical material selection and high turnover utilization rate. The selected materials are I-shaped steel, Bailey beams, finish-rolled deformed steel bars, wood templates and the like which are commonly used in engineering, the hoisting is quick, the lease cost is low, and the manufacturing cost is low.
The assembly is simple, and the construction efficiency is high; the support bearing system adopts Bailey beams as main bearing rod pieces in an assembling mode, PVC pipes are embedded when the cover beams are poured, finish-rolled deformed steel bars penetrate through the PVC pipes to be connected with the assembled Bailey beams, rod members are connected through anchor beams, a side span concrete pouring platform is erected on the bearing rod pieces, and the erecting speed of the system is obviously accelerated.
The hoisting is light and convenient, and the safety is high. Compared with a method of installing a bracket on a pier and erecting a platform on the bracket, the method has the advantages that each rod member required by the lower bearing type Bailey beam cantilever support system is light, the lifting weight is light, the lifting is rapid, the cantilever casting system is assembled on the top of the pier, the safety risk is obviously reduced, and the safety performance is obviously improved.
In the concrete pouring process, firstly, the slump of the concrete is compared with the standard slump of the concrete, whether the difference value between the slump of the concrete and the standard slump of the concrete is in a reasonable range or not is judged, when the difference value between the slump of the concrete and the standard slump of the concrete is in the reasonable range, the concrete is qualified, and when the difference value between the slump of the concrete and the standard slump of the concrete is not in the reasonable range, 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 internally provided with a concrete slump matrix, an adjusting parameter matrix of the concrete slump to the concrete mixing speed and an adjusting parameter matrix of the concrete slump to the concrete injection speed;
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 mixing speed of the concrete and the injection speed of the concrete; when the actual slump of the concrete is not within the range of the concrete slump matrix, the control module judges whether the slump of the concrete is too large or too small, when the concrete slump is overlarge, the control module adds a first concrete raw material into the concrete of unit volume according to the difference value between the concrete slump and the standard concrete slump, after the concrete is uniformly stirred, and the concrete slump is detected again, when the concrete slump is within the concrete slump matrix range, adjusting the adding speed and the stirring speed of the concrete according to the adjusted concrete slump, repeating the operation when the concrete slump still does not fall into the concrete slump matrix range until the concrete slump falls into the concrete slump matrix range, by the method, dynamic regulation and control of the concrete pouring process are realized, manual participation is reduced, and the speed and quality of concrete pouring can be effectively improved.
Drawings
FIG. 1 is a construction flow chart of a construction method for casting a side span straight-line segment of a continuous rigid frame bridge of a highway in situ;
FIG. 2 is a concrete operation flow chart of the construction method for casting the side span straight-line segment of the continuous rigid frame bridge of the highway in situ according to the invention;
FIG. 3 is a schematic cross-sectional view of a design of a side span cast-in-place section bracket system of a highway continuous rigid frame bridge according to the invention;
fig. 4 is a schematic view of a longitudinal section of a bracket system designed for the side span cast-in-place section of the highway continuous rigid frame bridge.
In the figure: 1. a balancing weight; 2. first 32 finish rolling a 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-rolled deformed steel; 8. an anchor beam; 9. a steel form; 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 be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit 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 only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, 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 otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Please refer to fig. 1, which is a flowchart illustrating a construction method for in-situ casting a side span straight-line segment of a continuous steel structure bridge of an expressway in the present embodiment, and fig. 2, which is a flowchart illustrating a specific method for in-situ casting a side span straight-line segment of a continuous steel structure bridge of an expressway in the present embodiment, wherein the method includes the following steps,
step S1, reserving holes on the pier top;
step S2, mounting a bracket system;
step S3, installing a template system;
step S4, installing the steel bars and the prestressed pipelines;
step S5, casting concrete in a cast-in-place section;
in the steps S1 to S2, PVC pipes are adopted to reserve vertical holes in transition piers, a Bailey beam is used as a main stressed member of a suspension assembly support, a first 32 finish-rolled deformed steel bar 2 is used as an anchoring rod and penetrates through the reserved holes to be connected with the Bailey beam, four groups of double-assembly 56c I-shaped steels 10 are arranged on a suspension cross bridge at a cast-in-place section, a bottom plate longitudinal beam adopts double-assembly 32b I-shaped steels 4, and after the Bailey beam is installed, a second 32 finish-rolled deformed steel bar 7 is adopted to anchor 3 double-assembly 56c I-shaped steels 5 below a Bailey beam suspension arm to bear the weight and construction load of concrete at the cast-in-place section; the upper surface of the Bailey beam cantilever support is provided with an anchor beam 8, the lower surface of the Bailey beam cantilever support is provided with an anchor beam 6, after the Bailey beam cantilever suspension system is erected, a hydraulic jack pretensioning method is adopted to vertically fasten the suspension casting system so as to eliminate inelastic deformation, and a balance weight block 1 is placed on one side of the Bailey beam close to the side of the T beam by adopting a lever principle so as to prevent the Bailey beam cantilever support system from overturning dangers; in the step S3, the side span cast-in-place section template adopts a rigid template 9 as an end template;
in the step S4, the reinforcing steel bars are manufactured into semi-finished products after being intensively blanked in a processing field, the semi-finished products are transported to the field for binding, and the binding of the reinforcing steel bars is carried out twice;
in 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 mixing 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, it is a schematic cross-sectional view of a design of a support system of the construction method for cast-in-place of the side span straight line segment of the continuous steel bridge of the highway in this embodiment; as shown in fig. 4, it is a schematic longitudinal section view of a design of a support system of the cast-in-place construction method for a side-span straight-line segment of a continuous rigid frame of an expressway in this embodiment;
and the step S1 includes that when the transition pier is constructed to the bent cap, two rows of PVC pipes are embedded in the bent cap in a single-row mode, the row distances from the outermost side of the top of the bent cap to the inner side are sequentially increased, and the PVC pipes are vertically embedded.
The row spacing of two rows of PVC pipes is 24cm, the PVC pipe diameter is 50mm, the length is 220cm, and the single row of PVC pipes is arranged from the outermost side of the top of the cover beam to the inside in sequence and is 67cm, 102cm, 137cm, 172cm and 192 cm.
Further, the step S2 includes:
a, construction preparation, namely, when a hanging basket is moved forwards during construction on a beam section, checking whether the hanging basket collides with a beam of a cast-in-place section, and when the front section of a hanging basket platform collides with the beam of the cast-in-place section, dismantling the front section of the hanging basket platform; when the front end of the cradle platform does not conflict with the beam of the cast-in-place section, preparing for the next operation;
b, hoisting the Bailey beams by using a tower crane, fastening two groups of cantilever Bailey beams at the longitudinal left side and the longitudinal right side, dividing a plurality of load-bearing Bailey beams into one group, connecting every two beams into one group by using a support frame, connecting the top surfaces of the Bailey beams into a whole by using channel steel, and connecting the anchoring pull rods and the Bailey beams by using anchoring carrying poles;
each group of the cantilever bailey beams is 5 pieces/group, the length of the cantilever bailey beams is 9m, each group of the bearing bailey beams is 5 pieces, and every two pieces are connected into a group by a 22.5cm support frame.
c, mounting the bottom cross beam and the longitudinal distribution beam, anchoring 3 double-spliced 56c I-steel 5 cross beams below a Bailey beam cantilever by using finish-rolled deformed steel bars 7, double-spliced 36b I-steel 11 and upper and lower double-layer anchoring nuts after hoisting and mounting of the Bailey beam, and bearing the weight of concrete at a cast-in-place section and construction load;
the lap joint length of the I-steel is 18cm, and the space between the square timbers is 10 cm.
d, vertically fastening the suspension casting system, and after the suspension casting system is built, vertically fastening the suspension casting system by adopting a hydraulic jack method to eliminate inelastic deformation;
e, balancing weight of the suspension casting system, after the installation of the Bailey beam cantilever support system is completed, placing a balancing weight 1 close to the side of the T beam on one side, and preventing the Bailey beam from overturning dangers by utilizing the lever principle.
The single-side counterweight 5t can also be replaced by equivalent weight materials, and the tail pressure weight is ensured to be not less than 10 t.
Further, before the Bailey beam is hoisted, a thick steel plate 3 is arranged at the intersection of the front supporting point of the Bailey beam and the beam cover, so that the concrete at the front end of the beam cover is prevented from being damaged in the construction process; and two channel steel vertical rods are arranged between the bottom surfaces of the top surfaces of the Bailey beams, and no gap is reserved between the channel steel vertical rods, so that the phenomenon that the local shearing of the Bailey beams is too large is eliminated.
The length of the side span cast-in-place section is 5.7m, and the thickness of the steel plate is 25mm.
Further, the reinforcement bar binding in the fourth step is performed in two times:
the first steel bar installation step is that a1, bottom plate stratum steel bar binding is carried out, b1, web and pier top solid section steel bar binding is carried out, and c1, vertical prestressed steel bar fixing is carried out;
the second steel bar installation step is: a2, after the top plate template is installed, binding the bottom layer steel bars of the top plate, b2, installing the longitudinal and transverse prestressed pipelines of the top plate, and c, binding the top layer steel bars 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 I-shaped steel, Bailey beams, finish-rolled deformed steel bars, wood templates and the like which are commonly used in engineering, the hoisting is quick, the lease cost is low, and the manufacturing cost is low.
The assembly is simple, and the construction efficiency is high; the support bearing system adopts Bailey beams as main bearing rod pieces in an assembling mode, PVC pipes are embedded when the cover beams are poured, finish-rolled deformed steel bars penetrate through the PVC pipes to be connected with the assembled Bailey beams, rod members are connected through anchor beams, a side span concrete pouring platform is erected on the bearing rod pieces, and the erecting speed of the system is obviously accelerated.
The hoisting is light and convenient, and the safety is high. Compared with a method of installing a bracket on a pier and erecting a platform on the bracket, the method has the advantages that each rod member required by the lower bearing type Bailey beam cantilever support system is light, the lifting weight is light, the lifting is rapid, the cantilever casting system is assembled on the top of the pier, the safety risk is obviously reduced, and the safety performance is obviously improved.
Further, in the step S5, in the cast-in-place concrete pouring process, the control module compares the slump K of the used concrete with a standard slump Kq preset in the control module:
when K is larger than Kq, the control module judges that the concrete slump is larger and calculates a slump difference value delta Ka, wherein delta Ka is K-Kq;
when K is smaller than Kq, the control module judges that the concrete slump is smaller and calculates a slump difference value delta Kb, wherein the delta Kb is Kq-K;
and when K is Kb, the control module judges that the slump of the concrete just meets the standard.
Further, a concrete slump reference difference value delta K is set 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 delta Ka is less than or equal to delta K, the control module judges that the slump difference of the concrete is within a reasonable range, and the slump of the concrete meets the standard;
when delta Ka is larger than delta K, the control module judges that the slump difference of the concrete is not in a reasonable range, and further adjusts the stirring speed and the injection speed of the concrete;
when delta Kb is less than or equal to delta K, the control module judges that the slump difference of the concrete is within a reasonable range, and the slump of the concrete meets the standard;
and when the delta Kb is larger than the delta K, the control module judges that the slump difference 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 controller is provided with a concrete slump matrix KO, a concrete slump to concrete mixing speed adjusting parameter matrix J0 and a concrete slump to concrete injection speed adjusting parameter ZO;
for the concrete humidity matrix K0, K0(K1, K2, K3, K4), where K1 is a first preset concrete humidity, K2 is a second preset concrete humidity, K3 is a third preset concrete humidity, and K4 is a fourth preset concrete humidity, the humidity values are sequentially increased;
a concrete mixing speed adjusting parameter matrix J0, J0(J1, J2) for concrete slump, wherein J1 is a first preset concrete slump to concrete mixing speed adjusting parameter, and J2 is a second preset concrete slump to concrete mixing speed adjusting parameter;
a concrete injection speed adjusting parameter matrix Z0, Z0(Z1, Z2) for concrete slump, wherein Z1 is a first preset concrete slump to concrete injection speed adjusting parameter, and Z2 is a second preset concrete slump to concrete injection speed adjusting parameter;
the control module compares the concrete slump K with parameters in the concrete slump matrix KO:
when K is more than K1 and less than or equal to K2, selecting J1 as a concrete stirring speed adjusting parameter; z1 is used as a concrete injection speed adjusting parameter;
when K is more than K2 and less than or equal to K3, the mixing speed and the injection speed of the concrete are not adjusted according to the slump of the concrete;
when K is more than K3 and less than or equal to K4, selecting J2 as a concrete stirring speed adjusting parameter; z2 is used as a concrete injection speed adjusting parameter.
Further, when the mixing speed of the concrete and the injection speed of the concrete need to be adjusted according to the slump of the concrete, the control device records the initial mixing speed A of the concrete and records the initial injection speed of the concrete as B;
selecting Jp as a concrete stirring speed adjusting parameter, and selecting Zp as a concrete injection speed, wherein p is 1 and 2;
the stirring speed of the adjusted concrete is A ', A' ═ A × Jp;
the adjusted concrete injection speed is B', B ═ B × Zp.
Further, 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 concrete slump is too small, calculates a slump difference value delta Ka, wherein delta Ka is K3-K, a first concrete raw material with the amount of L is added into the concrete of unit volume, L is delta Ka multiplied by L, L is a compensation parameter added to the first concrete raw material by the concrete slump difference value, the concrete is stirred after the first concrete raw material is added until the first concrete raw material and the concrete are uniformly mixed, the concrete slump K 'is detected at the moment, when K1 is less than or equal to K4, the stirring speed A' of the concrete and the injection speed B of the concrete are adjusted according to K ', and when K' is not within the range of K1-K4, the operation is repeated until K1 is less than or equal to K4;
when K is more than K4, the control module judges that the concrete slump is too large, calculates a slump difference value delta Kb, wherein delta Kb is K-K2, adds a second concrete raw material with the amount of M into the unit volume of concrete, wherein M is delta Kb multiplied by M, M is a compensation parameter of the slump difference value added to the second concrete raw material, stirs the concrete after the second concrete raw material is added until the second concrete raw material is uniformly mixed with the concrete, detects the concrete slump K ', adjusts the stirring speed A' of the concrete and the injection speed B of the concrete according to K 'when K1 is less than K' and less than K4, and repeats the operation until K1 is less than K 'and less than K4 when K' is not in the range of K1-K4.
In the concrete pouring process, firstly, the slump of the concrete is compared with the standard slump of the concrete, whether the difference value between the slump of the concrete and the standard slump of the concrete is in a reasonable range or not is judged, when the difference value between the slump of the concrete and the standard slump of the concrete is in the reasonable range, the concrete is qualified, and when the difference value between the slump of the concrete and the standard slump of the concrete is not in the reasonable range, 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 internally provided with a concrete slump matrix, an adjusting parameter matrix of the concrete slump to the concrete mixing speed and an adjusting parameter matrix of the concrete slump to the concrete injection speed;
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 appropriate adjusting parameters to adjust the mixing speed of the concrete and the injection speed of the concrete; when the actual slump of the concrete is not within the range of the concrete slump matrix, the control module judges whether the slump of the concrete is too large or too small, when the concrete slump is overlarge, the control module adds a first concrete raw material into the concrete of unit volume according to the difference value between the concrete slump and the standard concrete slump, after the concrete is uniformly stirred, and the concrete slump is detected again, when the concrete slump is within the concrete slump matrix range, adjusting the adding speed and the stirring speed of the concrete according to the adjusted concrete slump, repeating the operation when the concrete slump still does not fall into the concrete slump matrix range until the concrete slump falls into the concrete slump matrix range, by the method, dynamic regulation and control of the concrete pouring process are realized, manual participation is reduced, and the speed and quality of concrete pouring can be effectively improved.
So far, the technical solutions of the present invention have 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 the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cast-in-situ construction method for a side span straight line section of a continuous rigid frame bridge of a highway is characterized by comprising the following steps,
step S1, reserving holes on the pier top;
step S2, mounting a bracket system;
step S3, installing a template system;
step S4, installing the steel bars and the prestressed pipelines;
step S5, casting concrete in a cast-in-place section;
in the steps S1 to S2, PVC pipes are adopted to reserve vertical holes on transition piers, the Bailey beams are used as main stress members of the suspension splicing supports, finish-rolled deformed steel bars are used as anchoring rods to penetrate through the reserved holes to be connected with the Bailey beams, and after the Bailey beams are installed, I-beams and anchoring nuts are adopted to enable 3 double-spliced I-beam anchors to be arranged below the Bailey beam cantilever to bear the weight of cast-in-place section concrete and construction load; after the suspension system is built, the suspension 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 a Bailey beam close to a T beam by adopting a lever principle to prevent a Bailey beam cantilever support system from overturning dangers;
in the step S3, a steel plate mold is adopted as an end mold in the side span cast-in-place section template;
in the step S4, the reinforcing steel bars are manufactured into semi-finished products after being intensively blanked in a processing field, the semi-finished products are transported to the field for binding, and the binding of the reinforcing steel bars is carried out twice;
in 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 mixing 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.
2. The highway continuous rigid frame bridge side-span straight-line segment cast-in-place construction method according to claim 1, wherein the step S1 comprises the steps of embedding two rows of PVC pipes on the bent cap when the transition pier is constructed to the bent cap, arranging the PVC pipes in a single row, and increasing the row spacing from the outermost side of the top of the bent cap to the inner side in sequence, wherein the PVC pipes are embedded vertically.
3. The cast-in-place construction method for the side span straight line segment of the highway continuous rigid frame bridge according to claim 1, wherein the step S2 comprises the following steps:
a, construction preparation, namely, when a hanging basket is moved forwards during construction on a beam section, checking whether the hanging basket collides with a beam of a cast-in-place section, and when the front section of a hanging basket platform collides with the beam of the cast-in-place section, dismantling the front section of the hanging basket platform; when the front end of the cradle platform does not conflict with the beam of the cast-in-place section, preparing for the next operation;
b, hoisting the Bailey beams by using a tower crane, fastening two groups of overhanging Bailey beams at the longitudinal left side and the longitudinal right side, connecting every two bearing Bailey beams into a group by using a support frame, connecting the top surfaces of the Bailey beams into a whole by using channel steel, and connecting the anchoring pull rods and the Bailey beams by using anchoring carrying poles;
c, mounting the bottom cross beam and the longitudinal distribution beam, anchoring 3 double-spliced 56c I-steel cross beams below the cantilever of the Bailey beam by using finish-rolled deformed steel bars, double-spliced 36b I-steel and upper and lower double-layer anchoring nuts after the Bailey beam is hoisted and mounted, and bearing the weight of concrete at a cast-in-place section and construction load;
d, vertically fastening the suspension casting system, and after the suspension casting system is built, vertically fastening the suspension casting system by adopting a hydraulic jack method to eliminate inelastic deformation;
e, balancing weight of the suspension casting system, placing a balancing weight on one side close to the T-shaped beam after the installation of the Bailey beam cantilever support system is completed, and preventing the Bailey beam from overturning dangers by utilizing the lever principle.
4. The construction method for the in-situ casting 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 installed at the intersection of a front support point and a beam cover of the Bailey beam before the Bailey beam is hoisted, so that the concrete at the front end of the beam cover is prevented from being damaged in the construction process; and two channel steel vertical rods are arranged between the bottom surfaces of the top surfaces of the Bailey beams, and no gap exists between the channel steel vertical rods, so that the phenomenon that the local shearing of the Bailey beams is too large is eliminated.
5. The cast-in-place construction method for the side span straight line segment of the continuous rigid frame bridge of the expressway according to claim 1, wherein the step S4 is carried out by binding the reinforcing steel bars twice:
the first steel bar installation step is that a1, bottom plate stratum steel bar binding is carried out, b1, web and pier top solid section steel bar binding is carried out, and c1, vertical prestressed steel bar fixing is carried out;
the second steel bar installation step is: a2, after the top plate template is installed, binding the bottom layer steel bars of the top plate, b2, installing the longitudinal and transverse prestressed pipelines of the top plate, and c, binding the top layer steel bars of the top plate.
6. The construction method for the side span straight line segment cast-in-place of the continuous rigid frame bridge of the expressway as claimed in claim 1, wherein in the step S5, during the cast-in-place concrete casting process, the control module compares the slump K of the concrete used with a standard slump Kq preset in the control module:
when K is larger than Kq, the control module judges that the concrete slump is larger and calculates a slump difference value delta Ka, wherein delta Ka is K-Kq;
when K is smaller than Kq, the control module judges that the concrete slump is smaller and calculates a slump difference value delta Kb, wherein the delta Kb is Kq-K;
and when K is Kb, the control module judges that the slump of the concrete just meets the standard.
7. The construction method for the side span straight line segment cast-in-place of the continuous rigid frame bridge of the expressway as claimed in claim 6, wherein the control module is provided with a concrete slump reference difference delta K, and the concrete slump reference difference delta K is compared with the slump difference delta Ka and the slump difference delta Kb:
when delta Ka is less than or equal to delta K, the control module judges that the slump difference of the concrete is within a reasonable range, and the slump of the concrete meets the standard;
when delta Ka is larger than delta K, the control module judges that the slump difference of the concrete is not in a reasonable range, and further adjusts the stirring speed and the injection speed of the concrete;
when delta Kb is less than or equal to delta K, the control module judges that the slump difference of the concrete is within a reasonable range, and the slump of the concrete meets the standard;
and when the delta Kb is larger than the delta K, the control module judges that the slump difference of the concrete is not in a reasonable range, and further adjusts the stirring speed and the injection speed of the concrete.
8. The construction method for the in-situ casting of the side span straight line section of the continuous rigid frame bridge of the expressway according to claim 7, wherein when the concrete slump does not meet the standard, the controller is provided with a concrete slump matrix KO, a concrete slump to concrete mixing speed adjusting parameter matrix J0, and a concrete slump to concrete injection speed adjusting parameter ZO;
for the concrete humidity matrix K0, K0(K1, K2, K3, K4), where K1 is a first preset concrete humidity, K2 is a second preset concrete humidity, K3 is a third preset concrete humidity, and K4 is a fourth preset concrete humidity, the humidity values are sequentially increased;
a concrete mixing speed adjusting parameter matrix J0, J0(J1, J2) for concrete slump, wherein J1 is a first preset concrete slump to concrete mixing speed adjusting parameter, and J2 is a second preset concrete slump to concrete mixing speed adjusting parameter;
a concrete injection speed adjusting parameter matrix Z0, Z0(Z1, Z2) for concrete slump, wherein Z1 is a first preset concrete slump to concrete injection speed adjusting parameter, and Z2 is a second preset concrete slump to concrete injection speed adjusting parameter;
the control module compares the concrete slump K with parameters in the concrete slump matrix KO:
when K is more than K1 and less than or equal to K2, selecting J1 as a concrete stirring speed adjusting parameter; z1 is used as a concrete injection speed adjusting parameter;
when K is more than K2 and less than or equal to K3, the mixing speed and the injection speed of the concrete are not adjusted according to the slump of the concrete;
when K is more than K3 and less than or equal to K4, selecting J2 as a concrete stirring speed adjusting parameter; z2 is used as a concrete injection speed adjusting parameter.
9. The construction method for the side-span straight line segment cast-in-place of the continuous rigid frame bridge of the expressway as claimed in claim 8, wherein when the mixing speed of the concrete and the injection speed of the concrete need to be adjusted according to the slump of the concrete, the control device records the initial mixing speed A of the concrete and records the initial injection speed of the concrete as B;
selecting Jp as a concrete stirring speed adjusting parameter, and selecting Zp as a concrete injection speed, wherein p is 1 and 2;
the stirring speed of the adjusted concrete is A ', A' ═ A × Jp;
the adjusted concrete injection speed is B', B ═ B × Zp.
10. The construction method for the side span straight line section cast-in-place of the continuous rigid frame bridge of the expressway as claimed in claim 8, wherein when the concrete slump is not within a range of K1-K4, the concrete slump K is judged to be unqualified and is adjusted:
when K is less than or equal to K1, the control module judges that the concrete slump is too small, calculates a slump difference value delta Ka, wherein delta Ka is K3-K, a first concrete raw material with the amount of L is added into the concrete of unit volume, L is delta Ka multiplied by L, L is a compensation parameter added to the first concrete raw material by the concrete slump difference value, the concrete is stirred after the first concrete raw material is added until the first concrete raw material and the concrete are uniformly mixed, the concrete slump K 'is detected at the moment, when K1 is less than or equal to K4, the stirring speed A' of the concrete and the injection speed B of the concrete are adjusted according to K ', and when K' is not within the range of K1-K4, the operation is repeated until K1 is less than or equal to K4;
when K is more than K4, the control module judges that the concrete slump is too large, calculates a slump difference value delta Kb, wherein delta Kb is K-K2, adds a second concrete raw material with the amount of M into the unit volume of concrete, wherein M is delta Kb multiplied by M, M is a compensation parameter of the slump difference value added to the second concrete raw material, stirs the concrete after the second concrete raw material is added until the second concrete raw material is uniformly mixed with the concrete, detects the concrete slump K ', adjusts the stirring speed A' of the concrete and the injection speed B of the concrete according to K 'when K1 is less than K' and less than K4, and repeats the operation until K1 is less than K 'and less than K4 when K' is not in the range of K1-K4.
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