CN112482226A - Overhead variable-span length construction method for upstroke movable formwork - Google Patents
Overhead variable-span length construction method for upstroke movable formwork Download PDFInfo
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- CN112482226A CN112482226A CN202011300745.1A CN202011300745A CN112482226A CN 112482226 A CN112482226 A CN 112482226A CN 202011300745 A CN202011300745 A CN 202011300745A CN 112482226 A CN112482226 A CN 112482226A
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
Abstract
The invention relates to a construction method for lengthening an overhead variable cross of an upstroke type movable formwork. The construction method comprises the following steps: (1) carrying out construction preparation before span change; (2) connecting the hanging system and the side mold supporting system to be higher: the method comprises the steps of connecting a hanging system to be high and connecting a side mould supporting system to be high; (3) longitudinally lengthening the bottom die system; (4) vertically passing a hole through the movable mould frame; and (5) a step of die-jointing the side die to be high and long. The invention modifies and adjusts the upstroke movable mould frame to realize the construction of box girders with different spans, shortens the construction period of the box girders, improves the construction efficiency and quality of the box girders and saves the construction cost of the box girders compared with the movable mould frames with two corresponding spans. Corresponding hanging systems, supporting systems and template systems are added through adjustment, the structural construction of the original formwork is not required to be changed by a large amount, box girder construction with different spans can be achieved, and the change mode is simple and feasible.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a construction method for lengthening an overhead variable cross of an upstroke type movable formwork.
Background
A highway-railway dual-purpose bridge for a quan and a strait is the first highway-railway dual-purpose bridge across straits in China. The strait bridge is different from a previously constructed bay bridge, the construction of the strait bridge is under severe conditions of high wind, wave height, surge, strong typhoon, complex geology and the like, particularly, a pond strait is one of three famous storm sea areas in the world, and huge challenges and ultrahigh risks are brought to the bridge construction. The bridge is the first attempt in the field of cross-channel fjord bridges in China, and the environmental severity, technical challenges and construction risks are far beyond other cross-channel bay bridges built in China or in China. A highway-railway highway bridge with a plunge pool and a strait is a highway-railway highway bridge constructed in a complex storm surge environment for the first time in the world, and the safety operation of the highway bridge under the environment of ten grades of strong winds (land eight-grade wind operation) of an offshore bridge deck can be met after the highway-railway highway bridge is constructed.
The movable formwork is a large bridge construction device which is used for bridge construction and can automatically shift between bridge spans by self-provided formworks and finish the construction of concrete cast-in-place bridges step by step. At present, the movable formwork is widely applied to the construction of continuous beam bridges, and more bridge superstructure adopts a movable formwork cast-in-place construction method. However, in the actual construction process, due to different geographic environments, the span of the continuous beam bridge also changes. When the movable formwork is adopted to construct continuous beam bridges with different spans, the conventional treatment mode is to adopt two sets of different movable formworks to construct the bridge with the corresponding span. However, the conventional treatment method greatly increases the construction cost in actual construction, increases the workload of mounting and dismounting the movable formwork, reduces the construction efficiency and increases the risk coefficient of construction.
Therefore, there is a need for a reliable, efficient, economical and safe construction method for a movable formwork with a variable span length in high-altitude operation.
Disclosure of Invention
In order to solve the technical problems, the invention provides a construction method for lengthening an overhead variable cross of an upstroke type movable formwork.
The invention provides the following technical scheme:
an overhead variable-span length construction method for an upstroke movable formwork comprises the following steps:
(1) carrying out construction preparation before span change;
(2) connecting the hanging system and the side mold supporting system to be higher: the method comprises the steps of connecting a hanging system to be high and connecting a side mould supporting system to be high;
(3) longitudinally lengthening the bottom die system;
(4) vertically passing a hole through the movable mould frame; and
(5) and (3) die-jointing the side die to be high and long.
Preferably, in the step (2), the hanging system is connected with a height of 50-60cm by installing a 50-60cm extension section of the hanging system.
Preferably, the step of raising the suspension system comprises:
(21) installing a temporary long pull rod: installing a temporary long pull rod on the flange of the concrete box girder and locking the temporary long pull rod; and
(22) connecting the height after disconnecting: and removing the connecting bolts of the hanging system, jacking the main beam and the hanging frame integrally, and then installing a 50-60cm extension section of the hanging system.
Preferably, the step of lifting the side mould supporting system comprises the following steps:
(23) installing a temporary short pull rod: releasing the temporary long pull rod, and installing and locking the temporary short pull rod;
(24) connecting the height after disconnecting: removing the bolt constraint of the side mold stay bar, utilizing a jacking oil cylinder to drop the whole mold frame, and then installing the side mold stay bar extension section; and
(25) and releasing all temporary pull rods.
Preferably, the step (3) includes:
(31) splitting the middle section of the bottom die: removing bolts at the middle section of the bottom die after independently passing through holes at the middle section of the bottom die, then dividing the middle section of the bottom die into two sections at the top of a middle pier, continuously traveling the front section to a front pier and temporarily drilling a tip, and supporting the rear section on a working vehicle of the middle pier and the bottom die;
(32) installing a middle extension section of the bottom die: connecting the middle section extension section of the bottom die with the middle section rear section of the bottom die to form a connecting body;
(33) and (3) integrating: and (4) retreating the connecting body, and then retreating the front section of the middle section of the bottom die to the middle pier to be connected with the connecting body.
Preferably, the step (4) includes:
(41) and (3) bottom die via hole drilling: independently passing the lengthened middle section of the bottom die through a hole to the next variable span by using the leg-reversing trolley and the bottom die working trolley, and supporting two ends of the bottom die longitudinal beam on the bridge pier;
(42) lifting a bottom die working vehicle: the bottom die working vehicle moves to the reverse conveying device, the connection between the middle of the cross beam of the bottom die working vehicle is released, the bottom die working vehicle and the hanging system are folded in half respectively, the bottom die working vehicle is dismantled and connected, and the bottom die working vehicle is lifted by the reverse conveying device;
(43) longitudinally moving the hole through the whole machine of the movable mould frame: and (3) longitudinally moving the whole machine of the movable mould base to the position of the front pier by using the main middle support leg longitudinally moving oil cylinder, anchoring, and starting the mould opening oil cylinder after the through hole is in place to close the mould base and adjust the transverse position of the mould base.
Preferably, the step (4) further comprises: step (45): and installing a bottom die working trolley.
Preferably, the step (5) includes:
(51) jacking the main middle supporting leg and the fixed middle supporting leg, adjusting the elevation of the die set, transporting the front supporting leg to the advanced pier by using the leg-reversing trolley, and installing and anchoring the front supporting leg; and
(52) and (4) closing the bottom die, and assembling and mounting the heightened part and the longitudinal lengthened section of the side die in a scattered manner.
Preferably, the step (1) comprises:
(11) the step of performing the first part of the preparation: constructing the last span box girder concrete before span change, and embedding a pull rod hole in the end area of the flange of the concrete box girder;
(12) the step of performing a second part of the preparation: checking whether the hydraulic station is normal; checking whether the position of the supporting trolley is normal; removing the constraint influencing the vertical movement, and enabling the die carrier and the jacking oil cylinder to be in a free state; and
(13) the step of performing the third part of the preparation: preparing a temporary long pull rod and a temporary short pull rod; and releasing the pull rod at the middle section of the bottom die system.
Preferably, the method further comprises the step (6): pre-pressing the die carrier, and adjusting the pre-camber of the die carrier according to the pre-pressing result; locking a main box girder, installing a loose die and binding bottom web steel bars; and binding a top plate steel bar, installing an end die, and reporting and checking the cast concrete.
Advantageous effects
The technical scheme of the invention has the following advantages:
the method adopts an upstroke movable formwork, and can realize the construction of box girders with different spans through certain modification and adjustment.
The method provided by the invention can realize the construction of box girders with different spans without changing the structural structure of the original formwork by a large amount, and the transformation mode is simple and feasible.
In order to adapt to the construction of box girders with different heights, the temporary hanging device is arranged on the flange of the box girder, so that the formwork hanging system and the formwork supporting system can be connected to be high, the construction efficiency is improved, and manpower and material resources are saved.
According to the method, the temporary pull rod is mounted on the poured concrete box girder to slightly fix the formwork, the formwork can be lifted up through the lifting and descending of the main girder, the middle section of the bottom formwork can be lengthened through the leg reversing trolley and the bottom formwork working trolley, the span changing step can be safely and efficiently carried out, and the span changing of the formwork and the formwork construction can be synchronously carried out.
The middle section of the bottom die is independently lengthened through a via hole, the span-variable construction speed is high after the complete machine of the die frame is completed through the via hole, the construction procedure is compact and feasible, the labor division in the management is clear, and the continuity of the span-variable construction of the movable die frame is ensured.
Drawings
FIG. 1 is a flow chart of a construction method provided by the present invention;
FIG. 2 is a schematic view of the installation of a temporary long pull rod;
FIG. 3 is a schematic view of an extended section of the installation hanger system;
FIG. 4 is a schematic view of the installation of a short tie rod;
FIG. 5 is a schematic view of an extended section of an installation sideform;
fig. 6 to 8 are views illustrating a longitudinal extension step of the bottom mold;
FIG. 6 is a schematic diagram of the separation of the front section of the bottom die and the rear section of the bottom die;
FIG. 7 is a schematic view of the installation of the front section of the bottom die and the intermediate extension section of the bottom die;
FIG. 8 is a schematic view of the installation of the rear section of the bottom die with the front section of the bottom die and the intermediate long section;
fig. 9 is a schematic diagram of the construction completion of the ascending type movable formwork with high altitude and variable span length.
In the figure: 1: moving the mold frame; 2: bottom die; 3: side mould; 4: a hanging system extension section; 5: a temporary long pull rod; 6: a side form stay bar extension section; 7: a temporary short pull rod; 8: a front section of the bottom die; 9: a rear section of the bottom die; 10: the middle section of the bottom die; 11: a bridge pier; 12: and (4) longitudinally lengthening the section.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The movable mould frame can be divided into an upper movable mould frame, a lower movable mould frame and a composite movable mould frame in different modes of via holes. The main beam of the movable formwork is arranged above the cast-in-place box beam, and the upward movable formwork is moved by the box beam and the pier. The upward moving type movable mould frame used by the invention can be an upward moving type movable mould frame of TMS49.2 model of Wuhan Unicom mechanical technology Limited company, and structurally comprises a front auxiliary supporting leg, a fixed middle supporting leg, a main middle supporting leg, a rear traveling mechanism, a main box girder and a transverse connection thereof, a guide beam, a cantilever beam system, a hanger, an outer mould and a supporting system thereof, a bottom mould cross beam, a bottom mould longitudinal beam, an inner mould and a supporting system thereof, a lower trolley and a track thereof, a bottom surface working vehicle and a reverse transportation device thereof, a reverse leg trolley, a hydraulic system and an electrical appliance system. The invention provides an overhead variable cross-length construction method for an upstroke type movable formwork, which comprises the following steps with reference to fig. 1:
(1) carrying out construction preparation before span change;
(2) connecting the hanging system and the side mold supporting system to be higher: the method comprises the steps of connecting a hanging system to be high and connecting a side mould supporting system to be high;
(3) longitudinally lengthening the bottom die system;
(4) vertically passing a hole through the movable mould frame; and
(5) and (3) die-jointing the side die to be high and long.
For step (1), it is preferable to include the steps of:
(11) the step of performing the first part of the preparation: constructing the last span box girder concrete before span change, and embedding a pull rod hole in the end area of the flange of the concrete box girder;
(12) the step of performing a second part of the preparation: the working personnel of each hydraulic station are in position and check whether the hydraulic stations are normal; the personnel at each support position takes place and checks whether the position of the support trolley is normal; removing the constraint influencing the vertical movement, and enabling the die carrier and the jacking oil cylinder to be in a free state; and
(13) the step of performing the third part of the preparation: preparing a temporary long pull rod and a temporary short pull rod; and releasing the pull rod at the middle section of the bottom die system.
In a preferred embodiment, the step of raising the hanger system comprises:
(21) installing a temporary long pull rod: installing a temporary long pull rod on the flange of the concrete box girder through a pull rod hole and locking, and temporarily hanging the bottom die, the side die and the side die supporting system on the flange plate of the concrete box girder, wherein the finished state is shown in fig. 2;
(22) connecting the height after disconnecting: and (3) removing the connecting bolts of the hanging system, jacking the main beam and the hanging rack integrally, and then installing the lengthened section of the hanging system, wherein the length of the lengthened section of the hanging system is preferably 50-60cm, so that the hanging system is lengthened by 50-60cm, and the finished state is shown in figure 3.
In some preferred embodiments, the step of raising the sideform support system comprises:
(23) installing a temporary short pull rod: releasing the temporary long pull rod, and installing and locking the temporary short pull rod;
(24) connecting the height after disconnecting: releasing the bolt constraint of the side mold stay bar, using a jacking oil cylinder to drop the whole mold frame as shown in figure 4 after the completion, and then installing the side mold stay bar extension section as shown in figure 5 after the completion; and
(25) and releasing all temporary pull rods.
In some preferred embodiments, the step (3) comprises:
(31) splitting the middle section of the bottom die: removing bolts at the middle section of the bottom die after independently passing through holes at the middle section of the bottom die, then dividing the middle section of the bottom die into two sections at the top of the middle pier, continuously traveling the front section to the front pier and temporarily drilling a tip, and supporting the rear section on a working vehicle of the middle pier and the bottom die, as shown in fig. 6;
(32) installing a middle extension section of the bottom die: connecting the extension section of the middle section of the bottom die with the rear section of the middle section of the bottom die to form a connector, as shown in fig. 7;
(33) and (3) integrating: and (4) retreating the connecting body, and then retreating the front section of the middle section of the bottom die to the middle pier to be connected with the connecting body, as shown in fig. 8.
In some preferred embodiments, the step (4) comprises:
(41) and (3) bottom die via hole drilling: independently passing the lengthened middle section of the bottom die through a hole to the next variable span by using the leg-reversing trolley and the bottom die working trolley, and supporting two ends of the bottom die longitudinal beam on the bridge pier; (42) lifting a bottom die working vehicle: the bottom die working vehicle moves to the reverse conveying device, the connection between the middle of the cross beam of the bottom die working vehicle is released, the bottom die working vehicle and the hanging system are folded in half respectively, the bottom die working vehicle is dismantled and connected, and the bottom die working vehicle is lifted by the reverse conveying device; (43) longitudinally moving the hole through the whole machine of the movable mould frame: and (3) longitudinally moving the whole machine of the movable mould base to the position of the front pier by using the main middle support leg longitudinally moving oil cylinder, anchoring, and starting the mould opening oil cylinder after the through hole is in place to close the mould base and adjust the transverse position of the mould base. May further comprise step (44): and installing a bottom die working trolley.
In some preferred embodiments, the step (5) comprises:
(51) jacking the main middle supporting leg and the fixed middle supporting leg, adjusting the elevation of the die set, transporting the front supporting leg to the advanced pier by using the leg-reversing trolley, and installing and anchoring the front supporting leg; (52) and (3) closing the bottom die, and assembling and mounting the heightened parts and the longitudinal lengthened sections of the side dies in a scattered manner, wherein the finished state is shown in fig. 9.
Of course, the subsequent processing may also be performed, including the following steps: pre-pressing the die carrier, and adjusting the pre-camber of the die carrier according to the pre-pressing result; locking a main box girder, installing a loose die and binding bottom web steel bars; and binding a top plate steel bar, installing an end die, and reporting and checking the cast concrete.
And after the construction is finished, entering the next hole for construction.
The following are examples of the present invention.
Referring to fig. 1, an embodiment of the present invention provides an overhead variable-length construction method for an upstroke movable formwork, including the following steps:
s0: before the construction in which the movable formwork 1 becomes across the hole is performed, preparation work is performed.
The preparation work includes:
1. before the construction of the movable formwork 1 crossing the hole, a pre-buried pull rod hole needs to be reserved at the end part of the flange of the box girder of the last-span continuous girder bridge before the construction of the crossing.
2. Preparing long and short pull rods for lifting and hanging the die frame bottom die 2 and the side die 3.
3. And releasing all the constraints influencing the vertical movement, so that the movable die carrier 1 and the jacking oil cylinder are in a free state.
S1: completing the hanging and the height connection of the side mold supporting system.
Referring to fig. 2 to 5, the hanging and side form supporting system raising method includes the following steps:
1. as shown in fig. 2 and 3, the hanging system extension section is firstly installed: firstly, a temporary long pull rod 5 is installed on a cast span concrete box girder flange plate and locked, then a bottom die 2, a side die 3 and a side die supporting system are temporarily hung on the concrete box girder flange plate, connecting bolts of a hanging system are sequentially removed, finally, a main girder and a hanging frame are integrally lifted for a certain distance by using a jacking oil cylinder, and then a hanging system extension section 6 is sequentially installed.
2. As shown in fig. 4 and 5, installing the extension section of the side mold supporting system: the method comprises the steps of firstly removing a temporary long pull rod 5 on the outer side of the end part of a flange plate, installing a temporary short pull rod 7 and locking, then removing bolt restraint of a side mold stay rod, utilizing a jacking oil cylinder to integrally drop a mold of a mold frame for a certain distance, finally installing a side mold stay rod extension section 8, and removing all temporary pull rods.
S2: and finishing the longitudinal extension of the bottom die system.
Referring to fig. 6 to 8, the longitudinal extension of the bottom mold includes the following steps:
1. and (3) independently passing holes through the bottom die 2 by using the leg-reversing trolley and the bottom die working vehicle, detaching bolts in the middle of the bottom die 2, dividing the bottom die 2 into two sections at the top of a middle pier, continuously walking the front section 8 of the bottom die to a front pier and temporarily beating the front end, and supporting the rear section 9 of the bottom die on the middle pier and the bottom die working vehicle.
2. And (3) mounting a middle extension section 10 of the bottom die by using a tower crane and connecting the middle extension section with an original bottom die 9, screwing template connecting bolts at a middle pier, retreating the connected middle sections 10 and 9 of the bottom die after connection is finished, retreating a middle section front section 8 of the middle section of the bottom die to the middle pier, connecting the middle section with the connected template connecting bolts of 10 and 9 to form a whole, and finishing longitudinal system extension of the bottom die.
S3: and completing the longitudinal via hole, side die height connection and longitudinal extension of the movable die frame.
Referring to fig. 9, the step of side die-jointing and longitudinally lengthening includes the following steps:
1. and (3) independently passing the lengthened bottom die 2 through a hole to the next variable span by using the inverted leg trolley and the bottom die working vehicle, and supporting two ends of the longitudinal beam of the bottom die 2 on the front pier and the pier 11.
2. And (3) longitudinally moving the oil cylinder by using the main middle support leg, longitudinally moving the whole machine of the movable die frame to the position of the front pier and anchoring, starting the die opening oil cylinder after the through hole is in place, closing the die of the die frame, accurately adjusting the transverse position of the die frame, and installing the bottom die working trolley.
3. Jacking main middle supporting legs and fixing middle supporting legs, adjusting the elevation of the die frame, transporting the front supporting legs to the advanced pier by using the leg-reversing trolley, and installing and anchoring the front supporting legs.
4. After the whole die carrier is subjected to hole passing in place, the bottom die is closed, the heightened part of the side die and the longitudinal lengthened section 12 are assembled and installed in a scattered mode through the truck crane, and the whole die carrier system is changed to the next variable span position.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An overhead variable-span length construction method for an upstroke movable formwork is characterized by comprising the following steps of:
(1) carrying out construction preparation before span change;
(2) connecting the hanging system and the side mold supporting system to be higher: the method comprises the steps of connecting a hanging system to be high and connecting a side mould supporting system to be high;
(3) longitudinally lengthening the bottom die system;
(4) vertically passing a hole through the movable mould frame; and
(5) and (3) die-jointing the side die to be high and long.
2. The construction method according to claim 1, wherein in the step (2), the hanging system is raised by 50-60cm by installing a 50-60cm extended section of the hanging system.
3. The construction method according to claim 2, wherein the step of raising the hanging system comprises:
(21) installing a temporary long pull rod: installing a temporary long pull rod on the flange of the concrete box girder and locking the temporary long pull rod; and
(22) connecting the height after disconnecting: and removing the connecting bolts of the hanging system, jacking the main beam and the hanging frame integrally, and then installing a 50-60cm extension section of the hanging system.
4. The construction method according to claim 3, wherein the step of raising the side form supporting system comprises:
(23) installing a temporary short pull rod: releasing the temporary long pull rod, and installing and locking the temporary short pull rod;
(24) connecting the height after disconnecting: removing the bolt constraint of the side mold stay bar, utilizing a jacking oil cylinder to drop the whole mold frame, and then installing the side mold stay bar extension section; and
(25) and releasing all temporary pull rods.
5. The construction method according to any one of claims 1 to 4, wherein the step (3) comprises:
(31) splitting the middle section of the bottom die: removing bolts at the middle section of the bottom die after independently passing through holes at the middle section of the bottom die, then dividing the middle section of the bottom die into two sections at the top of a middle pier, continuously traveling the front section to a front pier and temporarily drilling a tip, and supporting the rear section on a working vehicle of the middle pier and the bottom die;
(32) installing a middle extension section of the bottom die: connecting the middle section extension section of the bottom die with the middle section rear section of the bottom die to form a connecting body;
(33) and (3) integrating: and (4) retreating the connecting body, and then retreating the front section of the middle section of the bottom die to the middle pier to be connected with the connecting body.
6. The construction method according to claim 5, wherein the step (4) comprises:
(41) and (3) bottom die via hole drilling: independently passing the lengthened middle section of the bottom die through a hole to the next variable span by using the leg-reversing trolley and the bottom die working trolley, and supporting two ends of the bottom die longitudinal beam on the bridge pier;
(42) lifting a bottom die working vehicle: the bottom die working vehicle moves to the reverse conveying device, the connection between the middle of the cross beam of the bottom die working vehicle is released, the bottom die working vehicle and the hanging system are folded in half respectively, the bottom die working vehicle is dismantled and connected, and the bottom die working vehicle is lifted by the reverse conveying device;
(43) longitudinally moving the hole through the whole machine of the movable mould frame: and (3) longitudinally moving the whole machine of the movable mould base to the position of the front pier by using the main middle support leg longitudinally moving oil cylinder, anchoring, and starting the mould opening oil cylinder after the through hole is in place to close the mould base and adjust the transverse position of the mould base.
7. The construction method according to claim 6, wherein the step (4) further comprises: step (45): and installing a bottom die working trolley.
8. The construction method according to claim 6 or 7, wherein the step (5) comprises:
(51) jacking the main middle supporting leg and the fixed middle supporting leg, adjusting the elevation of the die set, transporting the front supporting leg to the advanced pier by using the leg-reversing trolley, and installing and anchoring the front supporting leg; and
(52) and (4) closing the bottom die, and assembling and mounting the heightened part and the longitudinal lengthened section of the side die in a scattered manner.
9. The construction method according to any one of claims 1 to 8, wherein the step (1) comprises:
(11) the step of performing the first part of the preparation: constructing the last span box girder concrete before span change, and embedding a pull rod hole in the end area of the flange of the concrete box girder;
(12) the step of performing a second part of the preparation: checking whether the hydraulic station is normal; checking whether the position of the supporting trolley is normal; removing the constraint influencing the vertical movement, and enabling the die carrier and the jacking oil cylinder to be in a free state; and
(13) the step of performing the third part of the preparation: preparing a temporary long pull rod and a temporary short pull rod; and releasing the pull rod at the middle section of the bottom die system.
10. The production method according to any one of claims 1 to 9, characterized by further comprising step (6): pre-pressing the die carrier, and adjusting the pre-camber of the die carrier according to the pre-pressing result; locking a main box girder, installing a loose die and binding bottom web steel bars; and binding a top plate steel bar, installing an end die, and reporting and checking the cast concrete.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117230701A (en) * | 2023-10-24 | 2023-12-15 | 中铁四局集团有限公司 | Overweight load arc V pier bridge sector bracket and construction method |
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| CN112482226B (en) | 2022-07-15 |
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