CN210151596U - Integrated construction system for side-span cast-in-place section and closure section of high-pier continuous beam - Google Patents

Integrated construction system for side-span cast-in-place section and closure section of high-pier continuous beam Download PDF

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CN210151596U
CN210151596U CN201920635892.0U CN201920635892U CN210151596U CN 210151596 U CN210151596 U CN 210151596U CN 201920635892 U CN201920635892 U CN 201920635892U CN 210151596 U CN210151596 U CN 210151596U
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construction
continuous
span
place
closure
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江真
张庆明
隆勇
杨翔
李丽萍
李晓倩
王淼
余红卫
易雄川
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CHONGQING JIANGONG MUNICIPAL TRANSPORTATION PROJECT Co Ltd
Chongqing Construction Engineering Group Co Ltd
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CHONGQING JIANGONG MUNICIPAL TRANSPORTATION PROJECT Co Ltd
Chongqing Construction Engineering Group Co Ltd
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Abstract

The utility model relates to a construction technical field, concretely relates to cast-in-place section of high mound continuous beam side bay and close a section integration construction system, including the side bay pier shaft, apart from the nearest midspan pier shaft of side bay pier shaft, erect the construction roof beam on the side bay pier shaft and erect and stride the pier shaft in and be close to the continuous beam of construction roof beam one side, its characterized in that: still including hanging basket, bottom plate longeron and bottom plate crossbeam, hang the basket effect and install on continuous beam, the one end of bottom plate longeron is set up on the limit is striden the mound body, the other end is set up on hanging the basket, the bottom plate crossbeam erects in the bottom of bottom plate longeron, cast-in-place section and closure section are pour on the bottom plate longeron and are in the space between construction roof beam and the continuous beam, and construction convenience effectively solves the high mound support and sets up the problem, has avoided a large amount of supports to set up the construction, adopts and hangs basket system atress, and construction technology is simple to hang.

Description

Integrated construction system for side-span cast-in-place section and closure section of high-pier continuous beam
Technical Field
The utility model relates to a construction technical field, concretely relates to construction method of cast-in-place section of high mound continuous beam side bay and closure section integration construction system is applicable to the cast-in-place section of cradle cantilever construction side bay and closure section non-support construction.
Background
With the continuous and rapid promotion of the infrastructure construction in China, a large number of bridge projects emerge, and a long-span continuous bridge is one of the main bridge forms at present. The bridge is usually in a precast beam structure at a non-main span, the main span adopts a continuous beam, and suspension casting construction is carried out by utilizing a hanging basket. The construction of the side span closure section and the cast-in-place section of the continuous beam is very common in the construction of the high pier of the hanging basket construction, and the construction method generally adopted is the cast-in-place of the bracket. However, the pier stud is high, the difficulty in erecting the support is high, the hoisting is difficult, the slender stability of the support is poor, and more materials need to be added. Meanwhile, the problem of foundation treatment due to the difficulty in building the support is solved, the cost is increased, and the construction period is prolonged.
Disclosure of Invention
In view of the problem that exists among the prior art, the utility model provides a high mound continuous beam side-span cast-in-place section and closure section integration construction system, construction convenience effectively solves the high mound support and sets up the problem, has avoided a large amount of supports to set up the construction, adopts to hang the basket and hangs system atress, and construction technology is simple.
In order to realize the technical purpose, the utility model discloses a technical scheme as follows:
cast-in-place section of high mound continuous beam side bay and close a long section integration construction system include the side bay pier shaft, apart from the nearest midspan pier shaft of side bay pier shaft, erect the constructed roof beam on the side bay pier shaft and erect and stride on the pier shaft and be close to the continuous beam on one side of the constructed roof beam, its characterized in that: the hanging basket is installed on the continuous beam in an acting mode, one end of the bottom plate longitudinal beam is erected on the side span pier body, the other end of the bottom plate longitudinal beam is erected on the hanging basket, the bottom plate transverse beam is erected at the bottom of the bottom plate longitudinal beam, and the cast-in-place section and the closure section are poured on the bottom plate longitudinal beam and are located in a space between the constructed beam and the continuous beam.
And further limiting, the bottom plate longitudinal beams and the bottom plate cross beams are arranged at the lower edges of the constructed beams and the continuous beams, and wing plate guide beams arranged right above the bottom plate longitudinal beams are erected at the upper edges of the constructed beams and the continuous beams.
The construction method of the integrated system of the side span cast-in-place section and the closure section of the high-pier continuous beam comprises the following steps:
① construction preparation, which is to preliminarily draw up a construction technical scheme according to a conventional preparation mode, arrange a temporary support system, count the temporary load condition, calculate and analyze the stress state of the beam under the suspended load to obtain the technical support of relevant departments, compile a special construction scheme through calculation and analysis, complete the bridge approach construction of the side-span cast-in-place section, provide the fulcrums of the side-span cast-in-place section and the closure section, complete the approval procedures and make the technical bottom-crossing work before the start of work;
② construction monitoring calculation analysis, according to the scheme design of side span cast-in-place and closure, the weight 1/2 of the hanging basket cast-in-place section will act on the cantilever end of the continuous beam, the influence on the internal force of the bridge is analyzed under the condition that the load is added on the cantilever end, the counterweight scheme is determined,
according to the design of the side span cast-in-place and closure scheme, 1/2 of the sum of the weight of the hanging basket closure casting section and the weight of the cast-in-place section acts on the cantilever end of the continuous beam, the influence on the internal force of the bridge is analyzed under the condition that the load of the cantilever end is increased, the counterweight scheme is determined,
analyzing the influence of the load of the side span cast-in-place section and the side span closure section of the approach bridge hanging on the internal force of the bridge;
③ constructing cantilever to closure section and approach construction, namely after finishing construction of 0# block of pier top of main pier, symmetrically pouring cantilever on two sides, constructing cantilever section of cantilever irrigation by using hanging basket cantilever, after finishing construction of cantilever of one main pier, backing up the hanging basket at midspan in time to provide operation space for the hanging basket of the rear cantilever construction at the other side, when constructing the last suspension casting section, properly enlarging the holes of the hanging basket for penetrating through the box girder by hanging all the hanging rods, ensuring that the hanging rods can freely move back and forth in the holes of the box girder when the box girder is deformed, and reserving hanging rod holes on the approach wing plate and the top plate as the internal longitudinal beams of the hanging basket and the lower longitudinal beams of the wing plate for supporting during the approach construction;
④ hanging basket forward and hanging basket platform transformation, prepressing, namely, after the hanging basket cantilever construction is finished, moving forward to the end part of the cantilever segment, adjusting the hanging basket longitudinal beam to the position consistent with the elevation of the top surface of the side pier, detecting whether the longitudinal beam length meets the pouring length of the side span cast-in-place segment and the closure segment, and lengthening the longitudinal beam under the condition that the height is not met;
after the hanging basket transformation platform is installed, pre-pressing is carried out on the whole system, steel and 1T/bag sandbags are adopted in the side-span construction section for common stacking, stacking is carried out according to the sequence of a bottom plate, a web plate, a top plate and wing plates, wherein the steel and the sandbags are loaded step by step according to 40% → 60% → 80% → 100% → 120%, and the balance weight is carried out on the other end of the T-shaped structure through a water tank;
⑤ construction of side-span cast-in-place section, wherein the bottom plate of the construction platform of the side-span cast-in-place section is supported on the side pier and the construction section of the hanging basket cantilever by hanging basket longitudinal beams, and the wing plate is supported on the longitudinal hanging beam;
when the side span cast-in-place section is constructed, the side span cantilever end is required to be weighed, and the balance weight is arranged at the side of the mid-span according to design and monitoring requirements, when concrete is cast in the cast-in-place section, the cantilever end synchronously discharges water to keep the elevation of the cantilever end unchanged, the side span cantilever end and the mid-span closure end balance weight adopt a mode that a water tank is arranged at the side span cantilever end for weighing, wherein the weight of the water tank is 1/2 of the side span cast-in-place end pouring weight, the water tank adopts a bricked or iron welded water tank, when the side span cast-in-place section is cast, the mid-span water tank does not prevent water from being unloaded, and only the side span;
⑥ construction of side-span closure section, namely construction is carried out according to the sequence of mounting of a mid-span closure hanger bracket → steel bar binding → mounting of a prestressed pipeline → closure locking, dismantling of a side hole support, dismantling of temporary constraint of a middle fulcrum in the horizontal direction → selection of concrete casting in the lowest temperature time of the day → gradual removal of a water tank counterweight → closure section prestress tensioning, anchoring and grouting, wherein the closure casting cantilever end is temporarily connected with the side-span cast-in-place section, so that the obvious volume change of the concrete of the closure section in the casting and early hardening processes is avoided, the locking time is carried out according to the closure section locking design, and the construction support stiff framework adopts 'embedded foundation bolts + connection stiff I-shaped steel framework + embedded foundation bolts';
⑦ stretch-draw of side-span closure section, adjusting prestress in advance to single-end stretch-draw process according to construction organization design arrangement, burying anchor backing plate stretch-draw position during cast-in-situ construction, installing two-end stretch-draw anchor at anchoring end after threading, using steel strand to thread anchor, and using single stretch-draw jack to pre-tighten at the other end, finally using jack suitable for specification to perform whole bundle stretch-draw;
⑧ the hanging platform system is dismantled, after the construction of the side span closure is finished, the hanging platform is dismantled after the prestress grouting meets the design requirement according to the specific stress requirement of the middle span closure, when the hanging platform is dismantled, the hanging system is firstly loosened, the hanging basket longitudinal beam supported on the side pier descends the unloading device, the bottom template is separated, the hanging basket bottom plate beam and the longitudinal beam are gradually lowered to the ground by adopting a winch, the hanging basket main truss moves to the position with enough hoisting capacity of the No. 0 section in a walking mode and is dismantled by adopting the crane, wherein when the hanging platform is dismantled, the principle of 'first support then dismantling, then first dismantling' is followed.
According to the comprehensive comparison with the prior art, the construction method has the following advantages:
1. construction convenience effectively solves the high mound support and sets up the problem, has avoided a large amount of support to set up the construction, adopts and hangs basket suspension system atress, and construction technology is simple.
2. The technical economy is good: the method reduces the material usage amount, reduces the use of large-scale hoisting equipment, and has the obvious advantages of cost saving, construction period saving, good technical economy and the like aiming at the possible work such as bracket treatment and the like.
3. The time limit for a project is saved, and the efficiency is improved: the integrated non-support construction method for the side span cast-in-place section and the closure section of the high-pier continuous beam avoids the erection of a conventional construction support and the work of massive foundation treatment and the like, and the construction period is obviously saved.
Drawings
FIG. 1 is a schematic front view structure diagram of a side span cast-in-place section and closure section integrated construction system of a high pier continuous beam;
FIG. 2 is a schematic flow chart of a construction method of a high pier continuous beam side span cast-in-place section and closure section integrated construction system;
the corresponding labels in the figures are: 1-side span pier body, 2-mid span pier body, 3-constructed beam, 4-continuous beam, 5-hanging basket, 6-bottom plate longitudinal beam, 7-bottom plate cross beam and 8-wing plate guide beam.
Detailed Description
In order to make the technical solution of the present invention more comprehensible to those skilled in the art, the present invention is further described with reference to the accompanying drawings and examples.
As shown in fig. 1, 2, the integrated construction system of cast-in-place section and closure section of high pier continuous beam side span includes side span pier shaft 1, midspan pier shaft 2 nearest to side span pier shaft 1, constructed beam 3 erected on side span pier shaft 1, and continuous beam 4 erected on midspan pier shaft 2 and close to one side of constructed beam 3, which is characterized in that: the construction method is characterized by further comprising a hanging basket 5, a bottom plate longitudinal beam 6 and a bottom plate cross beam 7, wherein the hanging basket 5 is installed on the continuous beam 4 in an acting mode, one end of the bottom plate longitudinal beam 6 is erected on the side span pier body 2, the other end of the bottom plate longitudinal beam is erected on the hanging basket 5, the bottom plate cross beam 7 is erected at the bottom of the bottom plate longitudinal beam 6, and the cast-in-place section and the closure section are poured on the bottom plate longitudinal beam 6 and are located in a space between the constructed beam 3 and the continuous beam 4. The bottom plate longitudinal beams 6 and the bottom plate cross beams 7 are arranged at the lower edges of the constructed beams 3 and the continuous beams 4, and wing plate guide beams 8 which are arranged right above the bottom plate longitudinal beams 6 are also erected at the upper edges of the constructed beams 3 and the continuous beams 4.
The specific construction method comprises the following steps:
① construction preparation, which is to preliminarily draw up a construction technical scheme according to a conventional preparation mode, arrange a temporary support system, count the temporary load condition, calculate and analyze the stress state of the beam under the suspended load to obtain the technical support of relevant departments, compile a special construction scheme through calculation and analysis, complete the bridge approach construction of the side-span cast-in-place section, provide the fulcrums of the side-span cast-in-place section and the closure section, complete the approval procedures and make the technical bottom-crossing work before the start of work;
② construction monitoring calculation analysis, according to the scheme design of side span cast-in-place and closure, the weight 1/2 of the hanging basket cast-in-place section will act on the cantilever end of the continuous beam, the influence on the internal force of the bridge is analyzed under the condition that the load is added on the cantilever end, the counterweight scheme is determined,
according to the design of the side span cast-in-place and closure scheme, 1/2 of the sum of the weight of the hanging basket closure casting section and the weight of the cast-in-place section acts on the cantilever end of the continuous beam, the influence on the internal force of the bridge is analyzed under the condition that the load of the cantilever end is increased, the counterweight scheme is determined,
analyzing the influence of the load of the side span cast-in-place section and the side span closure section of the approach bridge hanging on the internal force of the bridge;
③ constructing cantilever to closure section and approach construction, namely after finishing construction of 0# block of pier top of main pier, symmetrically pouring cantilever on two sides, constructing cantilever section of cantilever irrigation by using hanging basket cantilever, after finishing construction of cantilever of one main pier, backing up the hanging basket at midspan in time to provide operation space for the hanging basket of the rear cantilever construction at the other side, when constructing the last suspension casting section, properly enlarging the holes of the hanging basket for penetrating through the box girder by hanging all the hanging rods, ensuring that the hanging rods can freely move back and forth in the holes of the box girder when the box girder is deformed, and reserving hanging rod holes on the approach wing plate and the top plate as the internal longitudinal beams of the hanging basket and the lower longitudinal beams of the wing plate for supporting during the approach construction;
④ hanging basket forward and hanging basket platform transformation, prepressing, namely, after the hanging basket cantilever construction is finished, moving forward to the end part of the cantilever segment, adjusting the hanging basket longitudinal beam to the position consistent with the elevation of the top surface of the side pier, detecting whether the longitudinal beam length meets the pouring length of the side span cast-in-place segment and the closure segment, and lengthening the longitudinal beam under the condition that the height is not met;
after the hanging basket transformation platform is installed, pre-pressing is carried out on the whole system, steel and 1T/bag sandbags are adopted in the side-span construction section for common stacking, stacking is carried out according to the sequence of a bottom plate, a web plate, a top plate and wing plates, wherein the steel and the sandbags are loaded step by step according to 40% → 60% → 80% → 100% → 120%, and the balance weight is carried out on the other end of the T-shaped structure through a water tank;
⑤ construction of side-span cast-in-place section, wherein the bottom plate of the construction platform of the side-span cast-in-place section is supported on the side pier and the construction section of the hanging basket cantilever by hanging basket longitudinal beams, and the wing plate is supported on the longitudinal hanging beam;
when the side span cast-in-place section is constructed, the side span cantilever end is required to be weighed, and the balance weight is arranged at the side of the mid-span according to design and monitoring requirements, when concrete is cast in the cast-in-place section, the cantilever end synchronously discharges water to keep the elevation of the cantilever end unchanged, the side span cantilever end and the mid-span closure end balance weight adopt a mode that a water tank is arranged at the side span cantilever end for weighing, wherein the weight of the water tank is 1/2 of the side span cast-in-place end pouring weight, the water tank adopts a bricked or iron welded water tank, when the side span cast-in-place section is cast, the mid-span water tank does not prevent water from being unloaded, and only the side span;
⑥ construction of side-span closure section, namely construction is carried out according to the sequence of mounting of a mid-span closure hanger bracket → steel bar binding → mounting of a prestressed pipeline → closure locking, dismantling of a side hole support, dismantling of temporary constraint of a middle fulcrum in the horizontal direction → selection of concrete casting in the lowest temperature time of the day → gradual removal of a water tank counterweight → closure section prestress tensioning, anchoring and grouting, wherein the closure casting cantilever end is temporarily connected with the side-span cast-in-place section, so that the obvious volume change of the concrete of the closure section in the casting and early hardening processes is avoided, the locking time is carried out according to the closure section locking design, and the construction support stiff framework adopts 'embedded foundation bolts + connection stiff I-shaped steel framework + embedded foundation bolts';
⑦ stretch-draw of side-span closure section, adjusting prestress in advance to single-end stretch-draw process according to construction organization design arrangement, burying anchor backing plate stretch-draw position during cast-in-situ construction, installing two-end stretch-draw anchor at anchoring end after threading, using steel strand to thread anchor, and using single stretch-draw jack to pre-tighten at the other end, finally using jack suitable for specification to perform whole bundle stretch-draw;
⑧ the hanging platform system is dismantled, after the construction of the side span closure is finished, the hanging platform is dismantled after the prestress grouting meets the design requirement according to the specific stress requirement of the middle span closure, when the hanging platform is dismantled, the hanging system is firstly loosened, the hanging basket longitudinal beam supported on the side pier descends the unloading device, the bottom template is separated, the hanging basket bottom plate beam and the longitudinal beam are gradually lowered to the ground by adopting a winch, the hanging basket main truss moves to the position with enough hoisting capacity of the No. 0 section in a walking mode and is dismantled by adopting the crane, wherein when the hanging platform is dismantled, the principle of 'first support then dismantling, then first dismantling' is followed.
It is right above the utility model provides a be applicable to cast-in-place section of high mound continuous beam side span and closure section integration construction system has carried out the detailed introduction, and the description of specific embodiment is only used for helping understanding the utility model discloses a method and core thought thereof. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (2)

1. Cast-in-place section of high mound continuous beam side bay and close a long section integration construction system, including the side bay pier shaft, apart from the nearest midspan pier shaft of side bay pier shaft, erect the constructed roof beam on the side bay pier shaft and erect and stride on the pier shaft and be close to the continuous beam of constructed roof beam one side in, its characterized in that: the hanging basket is installed on the continuous beam in an acting mode, one end of the bottom plate longitudinal beam is erected on the side span pier body, the other end of the bottom plate longitudinal beam is erected on the hanging basket, the bottom plate transverse beam is erected at the bottom of the bottom plate longitudinal beam, and the cast-in-place section and the closure section are poured on the bottom plate longitudinal beam and are located in a space between the constructed beam and the continuous beam.
2. The integrated construction system of the side span cast-in-place section and the closure section of the high pier continuous beam according to claim 1, characterized in that: the bottom plate longitudinal beams and the bottom plate cross beams are arranged at the lower edges of the constructed beams and the continuous beams, and wing plate guide beams arranged right above the bottom plate longitudinal beams are erected at the upper edges of the constructed beams and the continuous beams.
CN201920635892.0U 2019-05-06 2019-05-06 Integrated construction system for side-span cast-in-place section and closure section of high-pier continuous beam Active CN210151596U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111287096A (en) * 2020-04-03 2020-06-16 中国铁建大桥工程局集团有限公司 Closure construction method for continuous rigid frame beam of lower-towing super large bridge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111287096A (en) * 2020-04-03 2020-06-16 中国铁建大桥工程局集团有限公司 Closure construction method for continuous rigid frame beam of lower-towing super large bridge

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