CN110685232A - Method for installing support-free arch ring of concrete-filled steel tube arch bridge - Google Patents
Method for installing support-free arch ring of concrete-filled steel tube arch bridge Download PDFInfo
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- CN110685232A CN110685232A CN201911073590.XA CN201911073590A CN110685232A CN 110685232 A CN110685232 A CN 110685232A CN 201911073590 A CN201911073590 A CN 201911073590A CN 110685232 A CN110685232 A CN 110685232A
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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
- E01D4/00—Arch-type 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
- 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
- E01D2101/30—Metal
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Abstract
The invention relates to the technical field of bridge construction, in particular to a method for installing a support-free arch ring of a concrete-filled steel tube arch bridge, which comprises the following steps: s1, constructing an arch center; s2, installing a track; s3, erecting a transportation platform; s4, splicing arch ribs: after the arch rib of the first section is installed on each arch support, the crane is conveyed to the arch rib of the first section, the crane is controlled to crawl on the track, the crane can lift the arch rib of the next section from the arch rib of the previous section, two adjacent arch ribs in the width direction of the river channel are spliced through a flange plate to form an internally communicated arch ring, and two opposite arch ribs on the same bottom plate are connected through a cross brace after being spliced; s5, installing a buckle cable; and S6, pouring concrete. According to the invention, the arch rib is spliced by crawling on the arch ring by the crane and hoisting the arch rib, so that the arch ring can be installed without using a bracket.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a method for installing a support-free arch ring of a concrete-filled steel tube arch bridge.
Background
The arch rib installation technology is one of the foundations of arch bridge development, and the existing installation method of the concrete-filled steel tube arch bridge mainly comprises a support method, a swivel method and a cable hoisting method.
The support method is a construction method for cast-in-place or assembly on the support, and is suitable for construction conditions of small span, no navigation or low navigation requirement, shallow water depth and the like.
The turning construction method is a construction method for dividing an arch ring into two half spans to be manufactured on two banks and closing the arch ring by turning. The construction method of vertical turning is called when the arch ring is vertically rotated and closed, and the construction method of plane turning is called when the arch ring is horizontally rotated and closed around the arch base. This method was adopted to smoothly close the Guangzhou chignon sand bridge in 10 months 1999. The weight of the bridge is 13685t, the process method of assembling arch ribs by shore standers, then vertical rotation and horizontal rotation, closing and arching is adopted for construction, and the major breakthrough of the bridge rotation construction technology in China is obtained. However, as the span increases, the quality of the rotor, the construction process of the rotor, and the amount of the rotating disc fouling will face greater challenges, and therefore, the rotor method is difficult to achieve greater breakthroughs in span.
The cable hoisting of the arch rib is a method for hoisting arch rib segments (components) in place by using a cable hoist, temporarily fixing the segments (components) by using a bracket, a buckle cable or a sling cable and assisting with measures such as a cable wind cable and the like, and installing the arch rib. The arch rib sections are generally symmetrically and sequentially hoisted and butted to form two cantilever arch sections, finally, a closure section is arranged between the two cantilever arch sections, and the buckle cable is loosened to close the closure section to form the arch ring. However, as the tower is used as a main cable-handling load-bearing structure, the construction cost and the construction risk are increasing with the increase of the construction span. Along with the increase of the span of the concrete-filled steel tube arch bridge, the number of arch rib hoisting sections and the corresponding hoisting weight are also increased, and the height of the tower is also continuously increased, so that the instability of the tower and the hoisting risk are increased easily in the construction process. In addition, along with the increase of the span of the concrete-filled steel tube arch bridge, the arch rib hoisting operation efficiency is low, the construction control difficulty is high, and the installation risk is extremely high.
Disclosure of Invention
In order to solve the problems, the invention provides a method for installing a support-free arch ring of a concrete-filled steel tube arch bridge.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for installing the arch ring without supporting frame for the steel-pipe concrete arch bridge includes such steps as installing the steel-pipe concrete arch bridge to the supporting frame,
s1, building of an arch center: after the arch abutment construction positions are determined on two sides of a river channel, a bottom plate is built at the arch abutment construction positions, and two arch abutments are built on each bottom plate;
s2, mounting of the rail: welding a rail for a crane to crawl on the back of each arch rib;
s3, erection of a transportation platform: a placing platform is erected on one side of the arch support close to the river channel;
s4, splicing arch ribs: dividing the arch ring into a plurality of sections, wherein each section comprises two opposite arch ribs, and mounting the first arch rib on each arch abutment, so that the two first arch ribs on the same bottom plate face a river channel and are parallelly and parallelly mounted on the corresponding arch abutments; the crane is conveyed to the arch rib of the first section, the crane is controlled to crawl on the track, the crane can lift the arch rib of the next section from the arch rib of the previous section, two opposite arch ribs on each section are respectively spliced with the corresponding arch rib of the previous section in sequence, two adjacent arch ribs in the width direction of the river channel are spliced through a flange plate to form an internally communicated arch ring, and two opposite arch ribs on the same bottom plate are connected through a cross brace after being spliced; for 1/3 segment arch ribs from the arch ring foot to the arch ring top, transporting the segment arch ribs onto the placing platform so that the crane can lift the arch ribs of the placing platform; for 2/3 segment arch ribs from the top of the arch ring to the foot of the arch ring, transporting the segment arch ribs to a river channel by a transport ship, so that the crane lifts the arch ribs on the transport ship;
s5, installation of a buckle cable: and installing a buckling cable after the arch ribs of each section are spliced, wherein one end of the buckling cable, which is far away from the arch ribs, is installed on the ground anchor.
S6, pouring concrete: after step S5 is completed, concrete is poured into the arch ring.
Furthermore, a fixing frame and two fixing pipes are arranged on one side, facing the river channel, of the arch center, the fixing frame is fixed on one side, facing the river channel, of the arch center, the two fixing pipes are located on the upper side and the lower side of the fixing frame respectively, fixing grooves are formed in the first section of arch rib, after the first section of arch rib is hung to a proper position, the fixing grooves are clamped on the fixing frame, and two sides of the first section of arch rib are aligned with the two fixing pipes respectively; and after the first section of the arch rib and the fixed pipe are welded through an outer-wrapped steel pipe, concrete is laid on the arch support, so that the joint of the fixed groove and the fixed frame and the joint of the arch rib and the fixed pipe are embedded in the concrete.
Further, in step S4, four cranes are respectively transported to the two first segments of the arch ribs on the two banks of the river channel, so that the arch ribs on the two banks of the river channel are symmetrically constructed.
Further, after the arch ribs of each segment are spliced in the step 4, opposite sides of the two arch ribs facing away from each other are bound with cable ropes, and one ends of the cable ropes, far away from the arch ribs, are installed on the bank of the river channel.
Further, in step S5, a plurality of columns are disposed between the arch ring top and the arch ring foot, the columns are disposed on the back of the arch rib, and the construction method of the columns is as follows: after the stand passed through the transport ship and transported to the river course on, the crane with on the transport ship the stand is hoisted to the back of arch rib, will the one end of stand is passed through the ring flange and is fixed the back of arch rib, so that the knot cable can wear to locate through cable saddle slip the stand.
Further, in step S4, the arch rib is transported to the placing platform in a horizontal transportation manner, and the arch rib on the placing platform is turned over and erected by the crane; and the arch rib on the transport ship is vertically transported to a position needing to be lifted.
Further, in the step S6, a plurality of pouring points are disposed on the arch ring, and concrete is sequentially pumped into the arch ring from low to high in the pouring points in a progressive relay manner; before the concrete is poured, air in the arch ring is pumped out through a vacuum pump, and the vacuum pressure in the arch ring is smaller than-0.08 MPa.
Furthermore, an outer-wrapped steel pipe is wrapped at the splicing position of the two arch ribs to ensure the sealing property of the splicing position of the arch ribs.
The invention has the beneficial effects that:
1. the rails are welded on the back of each arch rib, so that a crane can crawl on the arch ribs, and the subsequent hoisting of the arch ribs is facilitated. Because each arch rib is provided with a track, after the first arch rib is arranged on the arch support, the crane is controlled to crawl on the track, the crane can lift the arch rib of the next section from the arch rib of the previous section, and after the crane lifts the arch rib to the set position, two adjacent arch ribs along the width direction of the river channel are spliced through the flange plate, so that the arch ring is arranged. Because the crane climbs on the arch ring, compared with the traditional cable hoisting method, the method does not need to establish a tower, thereby improving the splicing efficiency of the arch rib, and reducing the construction control difficulty and the installation risk; two opposite arch ribs on the same bottom plate are spliced simultaneously, and when the two opposite arch ribs are connected through the cross brace after being spliced, the stability of the arch ribs is improved.
2. Because the ground of the arch center close to one side of the river channel is often uneven, the hoisting of 1/3 segmental arch ribs from the foot part of the arch ring to the top part of the arch ring can be facilitated by transporting the arch ribs to the placing platform, and the transportation of the arch ribs is facilitated by transporting the arch ribs to the placing platform in a horizontal transportation mode. For 2/3 segmental arch ribs from the top of the arch ring to the foot of the arch ring, the arch ribs are transported to the positions needing to be lifted by a transport ship, a river channel is utilized, and a bracket is not required to be additionally built; because the position of the 2/3 segment rib is higher from the arch crown to the arch foot. The invention adopts vertical transportation to transport the arch ribs of the segments, and can prevent shaking during hoisting.
3. Before pouring the concrete, take out the air in the hunch circle through the vacuum pump, can guarantee the closely knit nature of concrete, prevent that the condition of taking off the air appears in the concrete in the hunch circle, improve the fastness of hunch circle. Because the concrete is pumped into the arch ring in a sectional manner in a progressive relay manner, the power of the pumping machine is reduced.
Drawings
Fig. 1 is a schematic rib splicing diagram illustrating a method for installing a frameless arch ring of a concrete filled steel tube arch bridge according to a preferred embodiment of the present invention.
Fig. 2 is a plan view of the arch ring of the method for installing the arch ring without a support in the concrete-filled steel tube arch bridge according to a preferred embodiment of the present invention.
Fig. 3 is a schematic view of the arch support structure of the method for installing the frameless arch ring of the steel pipe concrete arch bridge according to the preferred embodiment of the invention.
Fig. 4 is a schematic view of a buckle cable structure of a method for installing a frameless arch ring of a concrete filled steel tube arch bridge according to a preferred embodiment of the present invention.
Fig. 5 is a structural view illustrating a rib structure of a method for installing a frameless arch ring of a concrete filled steel tube arch bridge according to a preferred embodiment of the present invention.
In the figure, 1-bottom plate, 10-underground continuous wall, 11-arch base, 111-fixing frame, 112-fixing tube, 2-arch ring, 21-arch rib, 211-fixing groove, 22-cross brace, 3-crane, 4-ground anchor, 41-buckle cable, 5-upright post, 6-pouring point and 7-guy cable. 8-main chord tube, 81-web member, 82-transverse connecting tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 3, the method for installing the steel pipe concrete arch bridge without the support arch ring according to the preferred embodiment of the present invention is used for installing the third bridge in the south-planch, and includes the following steps:
s1, construction of the arch center 11: a floor 1 is built at the building of the abutments 11 and two abutments 11 are built on each floor 1. In this embodiment, an annular underground continuous wall 10 is provided, and the bottom plate 1 is disposed in the area of the underground continuous wall 10 and connected to the inner side wall of the underground continuous wall 10.
S2, mounting of the rail: a rail on which a crane climbs is welded to the back of each arch rib 21. By welding rails on the back of each arch rib 21, the crane 3 is enabled to crawl over the arch rib 21, thereby facilitating the lifting of subsequent arch ribs 21.
S3, erection of a transportation platform: and a placing platform is erected on one side of the arch support 11 close to the river channel.
S4, splicing the arch ribs 21: the arch 2 is divided into segments, each segment comprising two opposing ribs 21. The first arch rib 21 is installed on each arch base 11, so that the two first arch ribs 21 on the same bottom plate 1 face the river channel and are installed on the corresponding arch bases 11 in parallel. In this embodiment, one side of the arch support 11 facing the river is provided with a fixing frame 111 and two fixing pipes 112, the fixing frame 111 is fixed on one side of the arch support 11 facing the river, the two fixing pipes 112 are respectively located at the upper and lower sides of the fixing frame 111, the first arch rib 21 is provided with a fixing groove 211, after the first arch rib 21 is lifted to a suitable position, the fixing groove 211 is clamped on the fixing frame 111, and two sides of the first arch rib 21 are respectively aligned with the two fixing pipes 112. After the first arch rib 21 and the fixed pipe 112 are welded by the steel pipe, concrete is laid on the arch support 11 so that the joint between the fixed groove 211 and the fixed frame 111 and the joint between the arch rib 21 and the fixed pipe 112 are embedded in the concrete.
Under the effect of fixed slot 211 and mount 111, the adjustment of first section arch rib 21 angle of being convenient for, after first section arch rib 21 adjusted to suitable angle, weld first section arch rib 21 and fixed pipe 112 through outsourcing steel pipe, can make first section arch rib 21 fix in current position, and the concrete of laying on the hunch seat 11 can make first section arch rib 21 install on hunch seat 11 firmly, the security of hunch ring 2 when guaranteeing the follow-up construction.
After the first arch rib 21 is installed, the crane 3 is conveyed to the first arch rib 21, the crane 3 is controlled to crawl on the track, the crane 3 can lift the next arch rib 21 from the previous arch rib 21, two opposite arch ribs 21 on each segment are respectively spliced with the corresponding previous arch rib 21 in sequence, two adjacent arch ribs 21 in the width direction of the river channel are spliced through a flange plate to form an internally communicated arch ring 2, and the two opposite arch ribs 21 on the same bottom plate 1 are connected through a cross brace 22 after being spliced.
Because each arch rib 21 is provided with a track, after the first arch rib 21 is installed on the arch support 11, the crane 3 is controlled to crawl on the track, the crane 3 can lift the arch rib 21 of the next section from the arch rib 21 of the previous section, and after the crane 3 lifts the arch rib 21 to a set position, two adjacent arch ribs 21 along the width direction of the river channel are spliced through the flange plates, so that the installation of the arch ring 2 is realized.
Because the crane 3 of the invention crawls on the arch ring 2, compared with the traditional cable hoisting method, the invention does not need to establish a tower, thereby improving the splicing efficiency of the arch rib 21 and reducing the construction control difficulty and the installation risk. Two opposite arch ribs 21 on the same bottom plate 1 are spliced simultaneously, and when the two opposite arch ribs 21 are connected through the cross brace 22 after being spliced, the stability of the arch ribs 21 is improved.
After the arch ribs 21 of each section are spliced, the opposite sides of the two arch ribs 21 are bound with the cable rope 7, and one end of the cable rope 7 far away from the arch ribs 21 is arranged on the bank of the river channel. Under the effect of cable rope 7, can effectively guarantee the stability of arch rib 21, prevent that the air current from causing the arch rib 21 and rocking, can carry out the fine-tuning to the axis deviation of arch rib 21 along the river flow direction through stretch-draw cable rope 7 in addition.
For 1/3 segmental ribs 21 from the foot of the arch ring 2 to the top of the arch ring 2, transporting them onto the placing platform so that the crane 3 lifts the ribs 21 of the placing platform; for 2/3 segment ribs 21 from the top of the arch ring 2 to the foot of the arch ring 2, the arch ring is transported to the river channel by a transport ship, so that the crane 3 can lift the arch rib 21 on the transport ship. In the embodiment, the arch rib 21 is conveyed to the placing platform in a horizontal transportation mode, and the arch rib 21 on the placing platform is turned over and erected through the crane 3; the ribs 21 on the carrier are transported vertically to the desired location for lifting.
Because each arch rib 21 is provided with a track, after the first arch rib 21 is installed on the arch support 11, the crane 3 is controlled to crawl on the track, the crane 3 can lift the next arch rib 21 on the previous arch rib 21, and the crane 3 uses the previous arch rib 21 as a supporting point to lift and splice the next arch rib 21, thereby realizing the installation of the arch ring without the support. The position of the suspended arch rib 21 along the river flow direction can be adjusted by controlling the suspension arm of the crane 3; the height of the suspended arch rib 21 can be adjusted by controlling the hook of the crane 3.
Preferably, in step S4, four cranes 3 are respectively transported to the two first arch ribs 21 on the two banks of the river channel, so that the arch ribs 21 on the two banks of the river channel are symmetrically constructed. The four cranes 3 are utilized to splice the arch ribs through the arch seats on the two banks of the river channel at the same time, and finally the top of the arch ring is closed, so that the installation efficiency of the arch ring 2 is improved.
S5, installation of the lanyard 41: after each arch rib 21 is spliced, a buckle cable is installed, and one end of the buckle cable 41 far away from the arch rib 21 is installed on the ground anchor 4.
A plurality of columns 5 are arranged between the top of the arch ring 2 and the foot of the arch ring 2, the columns 5 are arranged on the back of the arch rib 21, in the embodiment, after the arch ribs 21 of 1/3 sections from the top of the arch ring 2 to the foot of the arch ring 2 are spliced, the columns 5 are arranged on the back of the arch rib 21, and the construction method of the columns 5 is as follows: after the upright post 5 is transported to a river channel by a transport ship, the crane 3 lifts the upright post 5 on the transport ship to the back of the arch rib 21, and one end of the upright post 5 is fixed on the back of the arch rib 21 through a flange plate, so that the buckle cable 41 can pass through the upright post 5 through a cable saddle in a sliding manner. The cable saddle is fixedly arranged on the upright 5 so that the lanyard 41 is connected with the upright 5 in a sliding manner.
The number of the upright columns 5 in the half-span arch ring 2 is calculated by dividing the number of the arch ribs 32 in the half-span arch ring 2 by 3, the obtained result is the number of the upright columns 5, and when the result has a remainder, an integer is taken and the result is increased by one. In the embodiment, the Pinnan three-bridge half-span arch ring 2 is provided with 9 sections of arch ribs 21, so that the number of the upright posts 5 is 3.
Because the arch rib 21 from the top of the arch ring 2 to the 1/3 section of the foot of the arch ring 2 is located at a higher position and the stability of the arch rib is poorer than that of other arch ribs, the safety and the stability of the arch ring 2 can be improved through the upright post 5.
S6, pouring concrete: after step S5 is completed, concrete is poured into the arch 2. In this embodiment, a plurality of pouring points 6 are disposed on the arch ring 2, and concrete is sequentially pumped into the arch ring 2 from low to high at the pouring points 6 step by step. Before pouring concrete, pumping out air in the arch ring 2 by a vacuum pump, and enabling the vacuum pressure in the arch ring 2 to be less than-0.08 MPa. The pouring point 6 of the present embodiment opens at the foot of the arch ring 2 and 1/4, 1/2, 3/4 of the foot of the arch ring 2 to the top of the arch ring 2.
Before pouring the concrete, take out the air in the arch ring 2 through the vacuum pump, can guarantee the closely knit nature of concrete, prevent that the condition of taking off the air appears in the concrete in the arch ring 2, improve the fastness of arch ring 2. Because the concrete adopts the mode of relaying step by step to pump the concrete segmentation to the arch ring 2 in, reduce the power of pump sending machine.
Preferably, the joint of the two arch ribs 21 is wrapped with an outer-wrapped steel pipe to ensure the sealing performance of the joint of the arch ribs 21.
The arch ring is installed by adopting the method for installing the steel pipe concrete arch bridge without the support in the embodiment for the Pinnan three-bridge, and the Pinnan three-bridge is positioned at the upstream 6km of a large bridge at the West river, the south, the county and the west of Guangxi Guihong City and is an oversize bridge with the connecting line communicated from Guangxi Lipu to Yulin highway and the north and the south of the plain crossing the river of the water delivery river. The main bridge of the Pinnan three-bridge is a half-through CFST arch bridge with the span of 575m, the rise-span ratio is 1/4, the arch axis coefficient is 1.50, as the arch ring of the Pinnan three-bridge has large pipe diameter and large span, each arch rib is divided into 18 sections for hoisting construction, and 9 spliced sections are respectively arranged on the south and north sides.
In this embodiment, the main arch rib on one side is divided into 9 segments in total, and is symmetrically arranged with the center line of the bridge, and the two banks are symmetrically arranged with the center of span, and the full bridge is 36 segments in total. The arch rib middle distance is 30.1m, each arch rib 21 comprises four main chord pipes 8, web members 81 and cross connecting pipes 82, as shown in fig. 5, the number of the main chord pipes 8 is four, the cross sections of the four main chord pipes 8 form four corners of a rectangle, two main chord pipes 8 with short distance are connected through the cross connecting pipes 82, two main chord pipes 8 with long distance are connected through the web members 81, the main chord pipes 81 are made of Q420qD steel, and the web members 81 are made of Q345C steel. This example analyzes a single side half span arch ring. The interconnecting tube 82 is welded after each arch rib 21 is hoisted and spliced.
In fig. 4, G1-G11 are segments for installing arch ribs, N1-N9 are guy cables, in order to ensure the safety of the structure in the construction process of hoisting by using a total-support-free crane, the total weight of the crane is taken as 110t, the crane is symmetrically loaded, two arch ribs 21 are loaded with 110t, the calculation and analysis are carried out on the Pinnan three-bridge, and the tension of each guy cable in each construction stage is calculated by combining with a forward installation analysis method, which is shown in table 1; the displacement amount of each control point and the stress of each arch rib at each construction stage are shown in table 2.
TABLE 1
As can be seen from table 1, in the splicing process of this embodiment, the tension of each lanyard has no significant abrupt change. And the maximum tensioning force of the buckling cable in the construction calculation process of each buckling cable can be taken according to the data in the table 1 so as to match the cable.
TABLE 2
Wherein the control point is provided at the junction of the lanyard 41 and the rib 21.
D is L/3000, D is a linear deviation, L is a span, the span of the Pinnan triple bridge in this embodiment is 575m, so that D is 191.7mm, and the absolute value of the displacement of each control point in table 2 is less than 191.7mm, which proves that the displacement of each control point in this embodiment meets the standard. The main chord tube is made of Q420qD steel, the maximum stress of the main chord tube can be 420MPa, and the absolute value of the stress of each arch rib in the table 3 is less than 420MPa, which proves that the stress of each arch rib in the embodiment is in accordance with the standard. According to the calculation results, the construction technology without the support is adopted, the stress and the linear deviation are within the allowable range in the whole construction process, and the construction scheme is represented to be feasible.
It is understood that the method can also be applied to the installation of other concrete filled steel tube arch bridge arch rings.
Claims (8)
1. A method for installing a support-free arch ring of a concrete-filled steel tube arch bridge is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s1, building of an arch center: after the arch abutment construction positions are determined on two sides of a river channel, a bottom plate is built at the arch abutment construction positions, and two arch abutments are built on each bottom plate;
s2, mounting of the rail: welding a rail for a crane to crawl on the back of each arch rib;
s3, erection of a transportation platform: a placing platform is erected on one side of the arch support close to the river channel;
s4, splicing arch ribs: dividing the arch ring into a plurality of sections, wherein each section comprises two opposite arch ribs, and mounting the first arch rib on each arch abutment, so that the two first arch ribs on the same bottom plate face a river channel and are parallelly and parallelly mounted on the corresponding arch abutments; the crane is conveyed to the arch rib of the first section, the crane is controlled to crawl on the track, the crane can lift the arch rib of the next section from the arch rib of the previous section, two opposite arch ribs on each section are respectively spliced with the corresponding arch rib of the previous section in sequence, two adjacent arch ribs in the width direction of the river channel are spliced through a flange plate to form an internally communicated arch ring, and two opposite arch ribs on the same bottom plate are connected through a cross brace after being spliced; for 1/3 segment arch ribs from the arch ring foot to the arch ring top, transporting the segment arch ribs onto the placing platform so that the crane can lift the arch ribs of the placing platform; for 2/3 segment arch ribs from the top of the arch ring to the foot of the arch ring, transporting the segment arch ribs to a river channel by a transport ship, so that the crane lifts the arch ribs on the transport ship;
s5, installation of a buckle cable: and installing a buckling cable after the arch ribs of each section are spliced, wherein one end of the buckling cable, which is far away from the arch ribs, is installed on the ground anchor.
S6, pouring concrete: after step S5 is completed, concrete is poured into the arch ring.
2. The method for installing a stentless arch ring of a steel pipe concrete arch bridge of claim 1, wherein: the fixing frame is fixed on one side of the arch center facing the river channel, the two fixing pipes are respectively positioned on the upper side and the lower side of the fixing frame, the first section of arch rib is provided with a fixing groove, the fixing groove is clamped on the fixing frame after the first section of arch rib is hung to a proper position, and two sides of the first section of arch rib are respectively aligned with the two fixing pipes; and after the first section of the arch rib and the fixed pipe are welded through an outer-wrapped steel pipe, concrete is laid on the arch support, so that the joint of the fixed groove and the fixed frame and the joint of the arch rib and the fixed pipe are embedded in the concrete.
3. The method for installing a stentless arch ring of a steel pipe concrete arch bridge of claim 1, wherein: in step S4, the four cranes are respectively transported to the two first segments of the arch ribs on the two banks of the river channel, so that the arch ribs on the two banks of the river channel are symmetrically constructed.
4. The method for installing a stentless arch ring of a steel pipe concrete arch bridge of claim 1, wherein: after the arch ribs of each section are spliced in the step 4, opposite sides of the two arch ribs facing away from each other are bound with cable ropes, and one ends of the cable ropes, which are far away from the arch ribs, are installed on the bank of the river channel.
5. The method for installing a stentless arch ring of a steel pipe concrete arch bridge of claim 1, wherein: in step S5, a plurality of columns are disposed between the arch ring top and the arch ring foot, the columns are disposed on the back of the arch rib, and the construction method of the columns is as follows: after the stand passed through the transport ship and transported to the river course on, the crane with on the transport ship the stand is hoisted to the back of arch rib, will the one end of stand is passed through the ring flange and is fixed the back of arch rib, so that the knot cable can wear to locate through cable saddle slip the stand.
6. The method for installing a stentless arch ring of a steel pipe concrete arch bridge of claim 1, wherein: in step S4, the arch rib is transported to the placing platform in a horizontal transportation manner, and the arch rib on the placing platform is turned over and erected by the crane; and the arch rib on the transport ship is vertically transported to a position needing to be lifted.
7. The method for installing a stentless arch ring of a steel pipe concrete arch bridge of claim 1, wherein: in the step S6, a plurality of pouring points are arranged on the arch ring, and concrete is sequentially pumped into the arch ring from low to high in a progressive relay manner at the pouring points; before the concrete is poured, air in the arch ring is pumped out through a vacuum pump, and the vacuum pressure in the arch ring is smaller than-0.08 MPa.
8. The method for installing a stentless arch ring of a steel pipe concrete arch bridge of claim 7, wherein: and the joint of the two arch ribs is wrapped with an outer-wrapped steel pipe so as to ensure the sealing property of the joint of the arch ribs.
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| CN114197327A (en) * | 2022-01-24 | 2022-03-18 | 广西路桥工程集团有限公司 | Steel pipe arch rib cantilever assembling method for loosening lifting point and installing buckle cable |
| CN114875767A (en) * | 2022-05-18 | 2022-08-09 | 中铁工程设计咨询集团有限公司 | Supporting rod type thrust arch bridge and construction method thereof |
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