CN117188309B - A construction method for cast-in-place steel pipe sections with fewer supports - Google Patents
A construction method for cast-in-place steel pipe sections with fewer supportsInfo
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- CN117188309B CN117188309B CN202311149478.6A CN202311149478A CN117188309B CN 117188309 B CN117188309 B CN 117188309B CN 202311149478 A CN202311149478 A CN 202311149478A CN 117188309 B CN117188309 B CN 117188309B
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Abstract
本发明公开了一种边跨现浇段钢管少支架施工方法，通过将支架钢管桩装设置成一定倾斜角度，以便让支架跨度达到要求的同时，钢管桩底部能处于墩柱承台上，位于承台上钢管桩无需另处理支架基础，以节省材料和人力、缩短施工周期，减少对支架钢管桩基础处理范围，无需对支架钢管桩下方额外设置承台。利用固定在现浇段另一侧引桥T梁上的卷扬机及悬挑梁，实现钢管桩起吊安装，可避免工艺衔接周期长、符合要求的起重设备进场困难等带来的不利影响。通过在承台上预埋弧形定位装置，墩身上提前将定位平联焊接，支架钢管桩吊装时，提升装置能沿着钢管桩空间位置进行提升，达到设计位置时，可利用弧形定位装置和定位平联快速锁定支架钢管桩空间位置。
This invention discloses a construction method for cast-in-place steel pipe piles with minimal scaffolding in side spans. By installing the scaffold steel pipe piles at a certain inclination angle, the span of the scaffolding is achieved while the bottom of the steel pipe piles rests on the pier cap. Steel pipe piles located on the cap do not require additional scaffolding foundation treatment, saving materials and manpower, shortening the construction period, reducing the scope of foundation treatment for the scaffold steel pipe piles, and eliminating the need for an additional cap below the scaffold steel pipe piles. A winch and cantilever beam fixed to the T-beam of the approach bridge on the other side of the cast-in-place section are used to lift and install the steel pipe piles, avoiding the adverse effects of long process connection cycles and difficulties in bringing in compliant lifting equipment. By pre-embedding an arc-shaped positioning device on the cap and welding positioning couplings to the pier body in advance, the lifting device can lift the scaffold steel pipe piles along their spatial position during hoisting. When the designed position is reached, the arc-shaped positioning device and positioning couplings can quickly lock the spatial position of the scaffold steel pipe piles.
Description
Technical Field
The invention belongs to the field of bridge construction, and particularly relates to a side span cast-in-situ section steel pipe few-bracket construction method.
Background
The construction of the side span cast-in-situ section of the concrete cable-stayed bridge usually adopts a bracket method or a bracket method. The bracket method is characterized in that a counterweight is required to be added on the other side of a cast-in-situ section due to the stress characteristic, when the span of the cast-in-situ section is larger, the structure is poorer in rigidity and stability, a full framing, few steel pipe brackets and the like are commonly adopted in the bracket method, wherein the full framing is not required to be used for the cast-in-situ section with higher height in economical efficiency and safety, the few steel pipe brackets are required to be erected, and large-tonnage hoisting equipment is required to assist in construction.
According to the past engineering experience, the lifting equipment adopted for erecting few supports of the cast-in-situ section steel pipe is mainly a tower crane, an automobile crane, a crawler crane, a pier-crossing gantry crane and the like. After the comparison analysis of these several schemes, the following conclusions can be drawn:
1. The construction of the tower crane or the bridge pier-crossing gantry crane is mainly influenced by the connection of pier column construction and cast-in-situ section construction, if the pier column construction is completed until the cast-in-situ section construction has a longer idle period, the bracket lease cost is increased if the bracket is erected in advance, the concrete age phase difference between the cast-in-situ section and the closure section is possibly too large, and meanwhile, the tower crane or the bridge pier-crossing gantry crane lease period is influenced if the bracket is not erected in advance. The construction method is not suitable in terms of construction cost and construction technology.
2. The hoisting equipment such as an automobile crane and a crawler crane is mainly influenced by two factors of terrain and the erecting height of a support, the steel pipe pile is used as a main stress structure, the weight is large, the hoisting equipment or the section hoisting is required to be large in the installation construction, if the section hoisting mode is adopted, the air connection and the positioning are difficult, and the steel pipe pile sagging is difficult to ensure. But is susceptible to terrain factors in mountainous areas which may result in insufficient lifting capacity of the equipment or difficulty in entering large tonnage equipment.
Disclosure of Invention
The invention aims to provide a construction method for few brackets of a side span cast-in-situ section steel pipe, which aims to solve the negative effects of long process connection period, difficult approach of hoisting equipment, more bracket consumables and the like of the conventional construction method, increase the actual operability of engineering and reduce the construction cost.
The invention aims to realize the construction method of few brackets of a side span cast-in-situ section steel pipe by the following technical means, which comprises the following steps:
Step one, lifting a positioning parallel connection on a bridge approach T beam on a high-level platform at the top of a pier body, installing the positioning parallel connection on the other side of the pier body opposite to the bridge approach T beam, and installing a fixing bracket on the pier body above the positioning parallel connection;
step two, mounting the lifting device and the bailey frame on a bridge approach T beam;
Thirdly, lifting the support steel pipe pile through a lifting device, and converting the support steel pipe pile into an inclined state after lifting, wherein the bottom end of the support steel pipe pile is connected to a bearing platform, and the support steel pipe pile body is connected with a positioning parallel connection;
installing other support steel pipe piles on the pier body, and installing transverse fixing parallel joints after the installation of two adjacent support steel pipe piles is completed, so as to fix the two adjacent support steel pipe piles;
Step five, connecting an unloading device at the top of the support steel pipe pile, respectively connecting pile-top bearing beams on the unloading device and the fixed support, enabling the heights of the tops of the pile-top bearing beams on the unloading device and the fixed support to be consistent, hoisting and connecting the bailey frame on the two pile-top bearing beams to serve as distribution beams with few supports;
and step six, continuously installing the rest structures of the few brackets until the erection construction of the few brackets is completed.
The positioning parallel connection comprises two crossbeams connected to the pier body, the two crossbeams are located at different heights, the length of the upper crossbeam is larger than that of the lower crossbeam, the inclination degree of a connecting line of the extending ends of the upper crossbeam and the lower crossbeam is consistent with that of the steel pipe pile of the support, and a scissor support is further connected between the upper crossbeam and the lower crossbeam.
If there are a plurality of pier bodies on the homonymy, then connect a plurality of vertical support steel-pipe piles on the cushion cap between two pier bodies, connect the location parallel connection on the support steel-pipe pile of the outside to hoist and mount the support steel-pipe pile and be connected to the location parallel connection, be connected with the pile bollard on the support steel-pipe pile, hoist and mount the bailey frame and connect when on the pile bollard of uninstallation device and fixed bolster, the pile bollard of support steel-pipe pile also links to each other with the bailey frame.
The arc-shaped positioning device is connected to the bearing platform and is an arc-shaped plate, the inclination degree of the arc-shaped plate is consistent with that of the support steel pipe pile, and the arc-shaped plate is inserted into the inner side of the support steel pipe pile, attached to the support steel pipe pile and connected with the support steel pipe pile.
The steel pipe support column is connected to the pier body top low-level platform, the top end of the steel pipe support column is in contact with the bailey frame and used for supporting the bailey frame, and the bailey frame is hoisted and connected to the two pile top bearing beams and then removed.
One end of the bailey frame is anchored on the bridge approach T beam, the other end extends out of the bridge approach T beam towards the positioning parallel connection direction and is suspended in the air, the traction ropes of one group of lifting devices hang down along the suspension end of the bailey frame, and the traction ropes of the other group of lifting devices hang down along the pier body.
The unloading device is a sand cylinder.
The fixed bolster includes that a plurality of one ends are connected embedded bar and spacer bar in the pier shaft, and embedded bar and spacer bar other end are equipped with second locating plate and first locating plate, all open a plurality of through-holes on second locating plate and the first locating plate and supply embedded bar and spacer bar to pass, and the second locating plate is connected with embedded bar and spacer bar, and the cover has the sleeve on the reinforcing bar between second locating plate and the first locating plate, and first locating plate passes through bolt and sleeve fastening.
The pile head bearing beam is characterized in that the top of the first positioning plate is also connected with a third positioning plate protruding outwards, the surface of the first positioning plate is also connected with a plurality of stiffening plates, the stiffening plates are connected with the third positioning plate, and the pile head bearing beam is connected to the top of the third positioning plate.
The invention has the beneficial effects that:
1. Through setting up the support steel-pipe pile dress into certain inclination to when letting the support span reach the requirement, the steel-pipe pile bottom can be in pier stud cushion cap, is located the steel-pipe pile and need not to handle the support basis in addition on the cushion cap, with save material and manpower, shorten construction cycle, reduce to support steel-pipe pile foundation treatment scope, need not to additionally set up the cushion cap to support steel-pipe pile below.
2. The hoisting machine and the cantilever beam fixed on the bridge approach T beam at the other side of the cast-in-situ section are utilized to realize hoisting installation of the steel pipe pile, and adverse effects caused by difficult approach of hoisting equipment and the like with long process connection period can be avoided.
3. Through pre-buried arc positioner on the cushion cap, will fix a position parallel connection welding in advance on the pier shaft, when support steel-pipe pile hoist and mount, hoisting device can promote along steel-pipe pile spatial position, when reaching the design position, usable arc positioner and location parallel connection locking support steel-pipe pile spatial position fast.
4. The steel bracket or the steel pipe pile column is replaced by the fixing bracket, so that about 1/4 steel can be saved.
Drawings
FIG. 1 is a schematic diagram of a step one;
FIG. 2 is a step two side view;
FIG. 3 is a second front view of the step;
FIG. 4 is a schematic view of a test crane;
FIG. 5 is a schematic diagram of a third step;
FIG. 6 is a schematic diagram of step four;
FIG. 7 is a schematic diagram of a fifth step;
FIG. 8 is a step six schematic;
FIG. 9 is a front elevation view of a lifting device assembly and construction arrangement;
FIG. 10 is a side view of a lifting device assembly and construction arrangement;
FIG. 11 is a side view of an arcuate positioning device;
FIG. 12 is a top view of the arcuate positioning device;
FIG. 13 is a side view of a stationary bracket;
FIG. 14 is a front view of the stationary bracket;
fig. 15 shows a supporting steel pipe pile pier shaft structure contrast diagram.
In the drawing, a pier body 1, a high-position platform 2, a positioning parallel connection, a fixed bracket 4, a bailey bracket 5, a bracket steel pipe pile 6, a transverse fixed parallel connection 7, an unloading device 8, a pile supporting beam 9, a steel pipe pile 10, a bearing platform 11, an arc-shaped positioning device 12, a low-position platform 13, a steel pipe supporting column 14, pre-buried steel bars 15, a positioning steel bar 16, a second positioning plate 17, a first positioning plate 18, a sleeve 19, a third positioning plate 20, a stiffening plate 21, a winch 22, an upper anchoring beam 23, a lower anchoring beam 24 and a cable wind rope 25.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Detailed Description
[ Example 1]
A construction method for few brackets of a side span cast-in-situ section steel pipe comprises the following steps:
Step one, lifting a positioning flat-joint 3 on a bridge approach T beam on a high platform 2 at the top of a pier body 1, installing the positioning flat-joint 3 on the other side of the pier body 1 opposite to the bridge approach T beam, and installing a fixing bracket 4 on the pier body 1 above the positioning flat-joint 3;
As shown in fig. 10, the top of the pier body 1 is divided into a high-level platform 2 and a low-level platform 13 during the conventional construction, and the bridge approach T beam is positioned on the high-level platform 2.
As shown in fig. 1, in the first step, the structure and the size of the processed positioning parallel connection 3 are compounded, the positioning parallel connection 3 is installed after the compounding is free of problems, and the positioning parallel connection 3 is installed on an approach bridge T beam of a cast-in-situ section by a small-sized automobile crane;
after the installation, as shown in fig. 3, since a plurality of support steel pipe piles 6 are to be arranged on each pier body 1, a plurality of groups of positioning parallel units 3 and fixing supports 4 are connected on the pier body 1.
The positioning parallel connection 3 comprises two crossbeams connected to the pier body 1, the two crossbeams are located at different heights, the length of the upper crossbeam is larger than that of the lower crossbeam, the inclination degree of a connecting line of the extending ends of the upper crossbeam and the lower crossbeam is consistent with that of the steel pipe pile 6 of the support, and a scissor support is connected between the upper crossbeam and the lower crossbeam.
Due to the inconsistent lengths, the support steel pipe piles 6 can be obliquely connected to the positioning parallel 3.
The fixed bolster 4 includes that a plurality of one ends are connected at the embedded bar 15 and the spacer bar 16 in pier shaft 1, and embedded bar 15 and the spacer bar 16 other end are equipped with second locating plate 17 and first locating plate 18, all open a plurality of through-holes on second locating plate 17 and the first locating plate 18 and supply embedded bar 15 and spacer bar 16 to pass, and second locating plate 17 is connected with embedded bar 15 and spacer bar 16, and the cover has sleeve 19 on the reinforcing bar between second locating plate 17 and the first locating plate 18, and first locating plate 18 passes through bolt and sleeve 19 fastening.
The steel bracket or the steel pipe pile column is replaced by the fixing bracket, so that about 1/4 steel can be saved.
The top of the first positioning plate 18 is also connected with a third positioning plate 20 protruding outwards, the surface of the first positioning plate 18 is also connected with a plurality of stiffening plates 21, the stiffening plates 21 are connected with the third positioning plate 20, and the pile-supporting beam 9 is connected to the top of the third positioning plate 20.
As shown in fig. 13 and 14, when the pier body 1 is constructed, a plurality of embedded bars 15 and positioning bars 16 are embedded in the design height, the fixing support 4 comprises a plurality of columns of bars, each column comprises an uppermost embedded bar 15 and a lowermost embedded bar 15, and two positioning bars 16 between the uppermost embedded bar and the lowermost embedded bar, a plurality of holes are formed in the second positioning plate 17 and the first positioning plate 18, the second positioning plate 17 and the first positioning plate 18 are inserted into an array formed by a plurality of bars, the second positioning plate 17 is fixed with the plurality of bars, a sleeve 19 is sleeved on the bar between the second positioning plate 17 and the first positioning plate 18, and the first positioning plate 18 is fastened on the sleeve 19 by screwing the bolts on the outer sides of the bars. The positioning steel bar 16 is also connected with the embedded steel bar 15.
The top of the first positioning plate 18 is also provided with a third positioning plate 20 extending outwards, the third positioning plate 20 is used for subsequent placement and connection of the pile-top bearing beam 9, and the outer side surface of the first positioning plate 18 is also provided with a plurality of stiffening plates 21 which are simultaneously connected with the first positioning plate 18 and the third positioning plate 20.
Step two, as shown in fig. 2, 3, 9 and 10, mounting the lifting device and the bailey frame 5 on the bridge approach T-beam;
one end of the bailey frame 5 is anchored on the bridge approach T beam, the other end extends out of the positioning parallel 3 to be suspended in the air, the hauling ropes of one group of lifting devices hang down along the suspension end of the bailey frame 5, and the hauling ropes of the other group of lifting devices hang down along the pier body 1.
And (3) assembling the lifting device and the bailey frame 5 according to the position of the paper steel pipe pile 6 of the bracket according to the design drawing, and anchoring the lifting device and the bailey frame on the bridge approach side T beam.
The suspension end of the bailey frame 5 is also connected with a cable rope 25, and the other end of the cable rope 25 is connected to the bridge deck of the bridge approach T beam.
The bailey frame 5 is placed on the bridge approach T-beam, one end of the bailey frame extends outwards to be suspended in the air, a part of the bridge approach T-beam is anchored on the T-beam, and specifically, the bailey frame 5 is anchored by an upper anchoring cross beam 23 above the bailey frame 5 and a lower anchoring cross beam 24 below the bridge approach side T-beam, and anchoring screw steels penetrating through the two anchoring cross beams.
As shown in fig. 4, the hoisting device is a hoist 22, wherein a traction rope of one hoist 22 winds down from a portion of the bailey frame 5 that is suspended at the outermost end for connecting the front end of the support steel pipe pile 6, and a traction rope of the other hoist 22 hangs down from the middle of the bailey frame 5 at the position of the pier body 1 for connecting the rear end of the support steel pipe pile 6, and the support steel pipe pile 6 can be pulled into an inclined posture as shown in fig. 5 by the two hoists 22.
The hoisting machine and the cantilever beam fixed on the bridge approach T beam at the other side of the cast-in-situ section are utilized to realize hoisting installation of the steel pipe pile, and adverse effects caused by difficult approach of hoisting equipment and the like with long process connection period can be avoided.
As shown in fig. 10, the lower platform 13 at the top of the pier body 1 is connected with a steel pipe support column 14, and the top end of the steel pipe support column 14 is in contact with the bailey frame 5 for supporting the bailey frame 5, and is dismounted after the bailey frame 5 is hoisted and connected to the two pile top spandrel girders 9. Or the steel pipe pile 6 is removed after the positioning of the support.
When the bailey frame 5 is anchored on the bridge approach T beam, the steel pipe support upright column 14 is connected on the low-level platform 13 and used for supporting the bailey frame 5, and when the subsequent bailey frame 5 is connected with the pile top bearing beam 9, the steel pipe support upright column 14 can be removed.
Thirdly, lifting the support steel pipe pile 6 through a lifting device, and converting the support steel pipe pile 6 into an inclined state after lifting, wherein the bottom end of the support steel pipe pile 6 is connected to the bearing platform 11, and the pile body of the support steel pipe pile 6 is connected with the positioning parallel 3;
as shown in fig. 4, before formally hoisting the support steel pipe pile 6, a hoisting device can be used for carrying out test hoisting, the weight of the test hoisting object is 1.25 times of the maximum weight of the hoisting object, and after the working performance of the hoisting device is determined, the support steel pipe pile is formally hoisted.
The hoisting result is shown in fig. 5, the support steel pipe pile 6 keeps an inclined posture, the bottom is connected to the bearing platform 11, and the pile body is connected with the positioning parallel 3.
In order to facilitate the determination of the bottom position and the inclination degree of the support steel pipe pile 6, an arc-shaped positioning device 12 is pre-buried on the bearing platform 11.
The bearing platform is connected with an arc-shaped positioning device 12, the positioning device is an arc-shaped plate, the inclination degree of the arc-shaped plate is consistent with that of the support steel pipe pile 6, and the arc-shaped plate is inserted into the inner side of the support steel pipe pile 6, attached to and connected with the support steel pipe pile 6.
As shown in fig. 11 and 12, the main structure of the arc positioning device 12 is an arc plate, the embedded part plate embedded in the bearing platform 11 is arranged below the arc plate, the inclination degree of the arc plate is consistent with that of the design of the support steel pipe pile 6, the support steel pipe pile 6 is aligned with the arc plate during hoisting, the arc plate is inserted into the support steel pipe pile 6 and attached to the inner wall of the support steel pipe pile 6, the bottom position and the inclination angle are correct, the position of the support steel pipe pile 6 can be rapidly positioned, and the arc plate and the support steel pipe pile 6 are welded and fixed subsequently.
Step four, installing other support steel pipe piles 6 on the pier body 1, and installing transverse fixing parallel connection 7 after the installation of two adjacent support steel pipe piles 6 is completed, so that the two adjacent support steel pipe piles 6 are fixed;
As shown in fig. 6, the other stent steel pipe piles 6 are installed, and the plurality of stent steel pipe piles 6 are laterally fixed by the lateral fixing parallel connection 7.
If there are a plurality of pier bodies 1 on the homonymy, then connect a plurality of vertical support steel-pipe piles 10 on the cushion cap 11 between two pier bodies, connect location parallel 3 on the support steel-pipe pile 10 of the outside to hoist and mount support steel-pipe pile 6 and be connected to location parallel 3, be connected with pile bolck spandrel 9 on the support steel-pipe pile 10, hoist and mount bailey frame 5 and connect when on the pile bolck spandrel 9 of uninstallation device 8 and fixed bolster 4, pile bolck spandrel 9 of support steel-pipe pile 10 also links to each other with bailey frame 5.
As shown in fig. 8, a pile-supporting beam 9 is connected to a plurality of unloading devices 8 in the same row, the pile-supporting beam 9 is supported by the plurality of unloading devices 8, another pile-supporting beam 9 is also supported by the fixed bracket 4, and the bailey frame 5 is supported by the two pile-supporting beams 9.
As shown in fig. 5, there are two pier bodies 1, no pier body 1 in the space between the two pier bodies 1 can fix and position the parallel connection 3, and in the subsequent step, the bailey frame needs to be hoisted to the support steel pipe pile 6, and the two pier bodies 1 lack support, so that in the space, a plurality of vertical support steel pipe piles 10 are connected to play a supporting role, and the outermost support steel pipe pile 10 is also connected with the positioning parallel connection 3, and the connecting support steel pipe pile 6 is hoisted to support the bailey frame 5, as shown in fig. 15, the left side is to replace the fixed support 4 with the support steel pipe pile 10 to support the bailey frame 5, the right side is the support structure with the pier body 1, and the unloading device 8 and the pile top bearing beam 9 are connected to the support steel pipe pile 10 to be consistent with the support steel pipe pile 6.
Step five, connecting an unloading device 8 at the top of the support steel pipe pile 6, respectively connecting pile-supporting beams 9 on the unloading device 8 and the fixed support 4, enabling the heights of the tops of the pile-supporting beams 9 on the unloading device 8 and the fixed support 4 to be identical, hoisting and connecting the bailey frame 5 on the two pile-supporting beams 9, and taking the bailey frame as a distribution beam with few supports;
The unloading device 8 is a sand cylinder.
As shown in fig. 7, the bailey frame 5 is anchored and removed, a sand cylinder is connected to the top of the support steel pipe pile 6, a pile-top bearing beam 9 is connected to the sand cylinder and the fixed support 4, the tops of the sand cylinder and the pile-top bearing beam 9 on the fixed support 4 are positioned on the same horizontal plane, and the bailey frame 5 is hoisted to the pile-top bearing beam 9 through an automobile crane and connected with the pile-top bearing beam 9, and serves as a distribution beam with few supports.
And step six, as shown in fig. 8, continuing to install the rest structures of the few brackets until the erection construction of the few brackets is completed.
And continuously installing the structures such as the few-bracket profile steel distribution beam, the bottom system and the like until the construction of few-bracket erection is completed.
Through setting up the support steel-pipe pile dress into certain inclination to when letting the support span reach the requirement, the steel-pipe pile bottom can be in pier stud cushion cap, is located the steel-pipe pile and need not to handle the support basis in addition on the cushion cap, with save material and manpower, shorten construction cycle, reduce to support steel-pipe pile foundation treatment scope, need not to additionally set up the cushion cap to support steel-pipe pile below.
The support device is suitable for high piers, slopes and the like, and can not be supported by adopting straight steel pipes, so that inclined steel pipe supports are adopted. The inclined steel pipe support utilizes permanent structural objects such as a bridge bearing platform and a pier body, an arc-shaped positioning plate is arranged on the bearing platform, steel pipe piles are wrapped outside the arc-shaped positioning plate to realize quick positioning of the bottoms of the steel pipe piles, embedded parts are arranged on the pier body, positioning parallel connection is installed to realize quick positioning of the tops of the steel pipe piles, and a bolt-on type fixing frame of the embedded parts is arranged on the tops of the pier columns, so that the number of the steel pipe piles can be reduced, the working efficiency is improved, the structural surfaces can be conveniently repaired after the steel pipe piles are removed at a later stage, and the embedded parts and the positioning parallel connection can be prefabricated in advance, so that the construction period is shortened. The steel pipe pile mounting mode is characterized in that the positioning parallel connection component is small, and the auxiliary mounting of the automobile crane can be adopted, but the steel pipe pile is large in caliber, long in length, large in weight of a single component, large in lifting height, and capable of being matched and positioned at an upper opening and a lower opening, and limited in site, and can not be matched and mounted by adopting two automobile cranes, so that the winch and the cantilever beam are designed to be matched and lifted to the steel pipe pile.
Claims (8)
1. The construction method of the few brackets of the side span cast-in-situ section steel pipe is characterized by comprising the following steps of:
Step one, lifting a positioning parallel (3) on a bridge approach T beam on a high-level platform (2) at the top of a pier body (1), installing the positioning parallel (3) at the other side of the pier body (1) opposite to the bridge approach T beam, and installing a fixing bracket (4) on the pier body (1) above the positioning parallel (3);
step two, mounting the lifting device and the bailey frame (5) on a bridge approach T beam;
Thirdly, lifting the support steel pipe pile (6) through a lifting device, converting the support steel pipe pile (6) into an inclined state after lifting, connecting the bottom end of the support steel pipe pile (6) to a bearing platform (11), connecting a pile body of the support steel pipe pile (6) with a positioning parallel joint (3), connecting an arc-shaped positioning device (12) on the bearing platform (11), wherein the positioning device is an arc-shaped plate, and the arc-shaped plate is consistent with the inclination degree of the support steel pipe pile (6), inserted into the inner side of the support steel pipe pile (6), and attached and connected with the support steel pipe pile (6);
Step four, installing other support steel pipe piles (6) on the pier body (1), and installing transverse fixing parallel joints (7) after the two adjacent support steel pipe piles (6) are installed, so as to fix the two adjacent support steel pipe piles (6);
Step five, connecting an unloading device (8) at the top of the support steel pipe pile (6), respectively connecting pile-supporting beams (9) on the unloading device (8) and the fixed support (4), enabling the heights of the tops of the pile-supporting beams (9) on the unloading device (8) and the fixed support (4) to be consistent, hoisting and connecting the bailey frame (5) on the two pile-supporting beams (9), and serving as a distribution beam with few supports;
and step six, continuously installing the rest structures of the few brackets until the erection construction of the few brackets is completed.
2. The construction method of the few brackets of the side span cast-in-situ section steel pipe is characterized in that the positioning parallel connection (3) comprises two cross beams connected to the pier body (1), the two cross beams are located at different heights, the length of an upper cross beam is larger than that of a lower cross beam, the inclination degree of a connecting line of the extending ends of the upper cross beam and the lower cross beam is consistent with that of a bracket steel pipe pile (6), and a scissor support is further connected between the upper cross beam and the lower cross beam.
3. The construction method of few supports of side span cast-in-situ section steel pipes of claim 1, wherein if a plurality of pier bodies (1) are arranged on the same side, a plurality of vertical support steel pipe piles (10) are connected to a bearing platform (11) between the two pier bodies, a positioning parallel (3) is connected to the outermost support steel pipe pile (10), a pile top bearing beam (9) is connected to the support steel pipe pile (10), and when a bailey frame (5) is hoisted and connected to the pile top bearing beam (9) of a unloading device (8) and a fixed support (4), the pile top bearing beam (9) of the support steel pipe pile (10) is also connected with the bailey frame (5).
4. The construction method of the few brackets of the side span cast-in-situ section steel pipe is characterized in that a steel pipe supporting column (14) is connected to a low-level platform (13) at the top of a pier body (1), the top end of the steel pipe supporting column (14) is contacted with a bailey frame (5) and used for supporting the bailey frame (5), and the bailey frame (5) is hoisted and connected to two pile-supporting beams (9) and then removed.
5. The construction method of the few brackets of the side span cast-in-situ section steel pipe is characterized in that one end of a bailey frame (5) is anchored on a bridge approach T beam, the other end of the bailey frame extends out of the positioning parallel (3) to be suspended in the air, a traction rope of one group of lifting devices hangs down along the suspension end of the bailey frame (5), and a traction rope of the other group of lifting devices hangs down along a pier body (1).
6. The construction method of few supports of the side span cast-in-situ section steel pipe, as claimed in claim 1, is characterized in that the unloading device (8) is a sand cylinder.
7. The construction method of the few brackets of the side span cast-in-situ section steel pipe is characterized in that the fixing bracket (4) comprises a plurality of embedded bars (15) and positioning bars (16) with one ends connected in a pier body (1), a second positioning plate (17) and a first positioning plate (18) are arranged at the other ends of the embedded bars (15) and the positioning bars (16), a plurality of through holes are formed in the second positioning plate (17) and the first positioning plate (18) for the embedded bars (15) and the positioning bars (16) to pass through, the second positioning plate (17) is connected with the embedded bars (15) and the positioning bars (16), sleeves (19) are sleeved on the bars between the second positioning plate (17) and the first positioning plate (18), and the first positioning plate (18) is fastened with the sleeves (19) through bolts.
8. The construction method of few supports of the side span cast-in-situ section steel pipe of claim 7, wherein the top of the first positioning plate (18) is further connected with a third positioning plate (20) protruding outwards, the surface of the first positioning plate (18) is further connected with a plurality of stiffening plates (21), the stiffening plates (21) are connected with the third positioning plate (20), and the pile supporting beam (9) is connected to the top of the third positioning plate (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311149478.6A CN117188309B (en) | 2023-09-06 | 2023-09-06 | A construction method for cast-in-place steel pipe sections with fewer supports |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109537468A (en) * | 2018-12-18 | 2019-03-29 | 广西路桥工程集团有限公司 | Cast-in-place support construction method in a kind of ultrahigh water |
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| CN116254783B (en) * | 2023-02-21 | 2025-12-09 | 中铁十四局集团第三工程有限公司 | High-position girder falling construction method suitable for erecting high-speed railway precast box girders |
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| CN108103956A (en) * | 2017-12-21 | 2018-06-01 | 中铁三局集团华东建设有限公司 | The construction method of cantilever casting beam end bay battered leg |
| CN109537468A (en) * | 2018-12-18 | 2019-03-29 | 广西路桥工程集团有限公司 | Cast-in-place support construction method in a kind of ultrahigh water |
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