CN111851318B - Side span formwork system of cantilever bridge and its construction method - Google Patents
Side span formwork system of cantilever bridge and its construction method Download PDFInfo
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- CN111851318B CN111851318B CN202010920835.4A CN202010920835A CN111851318B CN 111851318 B CN111851318 B CN 111851318B CN 202010920835 A CN202010920835 A CN 202010920835A CN 111851318 B CN111851318 B CN 111851318B
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- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000009415 formwork Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 51
- 239000010959 steel Substances 0.000 claims abstract description 51
- 238000009826 distribution Methods 0.000 claims abstract description 11
- 238000004873 anchoring Methods 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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Abstract
本发明公开了悬臂桥边跨支模体系及其施工方法，属于桥梁建筑技术领域，预埋钢板设置在边跨支墩顶部，在预埋钢板上焊接安装支撑架，相邻支撑架之间设置加强撑，在支撑架和已浇筑桥段间安装临时固定墩、顶部纵梁、支架纵梁、后上横梁、后下横梁和前横梁，在底部纵梁上设置横向分配梁；底模主要铺设在横向分配梁上，另一部分铺设在支撑架和永久支座之间，由内临时支座支撑，外模支架设在支架纵梁上，翼缘底模和外侧模设置在外模支架上，分别通过对拉拉杆固定，底模上安装有内模，利用边跨支墩顶部支撑架和已浇筑桥段作为悬臂桥边跨合拢段施工的重力支撑结构，减少吊装工作量，从而减少了施工工期和成本。
The invention discloses a side span formwork system of a cantilever bridge and a construction method thereof, and belongs to the technical field of bridge construction. Pre-embedded steel plates are arranged on the top of side span buttresses, and support frames are welded and installed on the pre-embedded steel plates. Strengthen the bracing, install temporary fixed piers, top longitudinal beams, support longitudinal beams, rear upper beams, rear lower beams and front beams between the support frame and the poured bridge section, and set up a horizontal distribution beam on the bottom longitudinal beam; the bottom formwork is mainly laid On the lateral distribution beam, the other part is laid between the support frame and the permanent support, supported by the inner temporary support, the outer mold bracket is set on the support longitudinal beam, and the flange bottom mold and the outer mold are set on the outer mold support, respectively. By fixing the tie rods, the bottom mold is installed with an inner mold, and the top support frame of the side span pier and the poured bridge section are used as the gravity support structure for the construction of the side span closing section of the cantilever bridge, which reduces the hoisting workload and thus reduces the construction period. and cost.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a cantilever bridge side span formwork system and a construction method thereof.
Background
With the continuous development of social economy in China, bridge construction enters a high-speed development period, the construction investment scale of the current roads and bridges is larger and larger, the requirements on related construction technical levels are higher and higher, and the structural complexity is deepened gradually. The cantilever beam bridge refers to a beam bridge which takes a simple beam with one end or two ends freely hanging outwards as a main bearing component of an upper structure. The cantilever beam bridge is generally a statically determinate structure, the internal force of the structure is not influenced by the deformation of the foundation, and the requirement on the foundation is lower. In the porous bridge, only one support needs to be arranged on the pier, so that the size of the pier is correspondingly reduced, the material consumption of basic engineering is also saved, and the porous bridge is widely applied to bridge construction.
The cantilever bridge is not easy to adopt assembly type construction, and a hanging basket method is usually adopted when the cantilever bridge with a large span is poured, so that the cantilever operation is segmented on site. For example, in the side span closure segment construction, the prior patent CN103556578B utilizes the side span pier top and the hanging basket as the gravity support structure for casting the continuous beam straight-line segment and the side span closure segment by the cantilever, instead of setting up the side span cast-in-place support on the ground as the gravity support structure of the concrete project. However, the patent only describes how to support the outer mold, but does not describe how to support the inner mold, and for the support of the inner mold, a complex hanging basket system needs to be erected, and the hanging basket system is cast in situ on a support template which is expensive, complicated to build and slow in speed.
Therefore, it is important to find a cantilever bridge side-span formwork system with high construction efficiency, good economic benefit and simple and stable structure and a construction method thereof.
Disclosure of Invention
The invention aims to overcome the defects and provides a cantilever bridge side span formwork system and a construction method thereof.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a construction method of a cantilever bridge side span formwork system, which comprises the following steps:
the method comprises the following steps that firstly, an embedded steel plate is embedded in the top of a pouring side-span buttress, a support frame with an upper support beam, a middle support beam and a lower support beam is installed on the embedded steel plate, and an external temporary support is installed on the top of the pouring side-span buttress;
step two, mounting a temporary fixing pier above a top plate of a poured bridge section, fixing a rear upper crossbeam below the top plate of the poured bridge section through a rear sling, anchoring a rear lower crossbeam below a bottom plate of the poured bridge section, respectively connecting two ends of a top longitudinal beam to the temporary fixing pier and a supporting crossbeam on the upper way of a supporting frame, respectively connecting two ends of a support longitudinal beam to the supporting crossbeam on the middle way of the supporting frame and the rear sling arranged on the top plate, respectively connecting two ends of a bottom longitudinal beam to the rear sling arranged on an outer temporary support and the bottom plate, and fully paving a transverse distribution beam on the bottom longitudinal beam;
thirdly, mounting front hanging strips in the middle areas of the top longitudinal beam and the support longitudinal beam, and hanging a front cross beam on the front hanging strips;
fourthly, mounting a bottom die on the transverse distribution beam, and paving the bottom die between the support frame and the permanent support and supporting the bottom die by the inner temporary support;
fifthly, mounting an outer mold support on the support longitudinal beam, and fixing the flange bottom die and the outer side die on the outer mold support through a counter-pull rod;
and step six, binding steel bars on the bottom plate of the side span section, and mounting the inner mold on the bottom mold.
Furthermore, the inner die is arranged above the bottom die in a hanging mode through support angle steel, one end of the support angle steel is arranged on a support cross beam of a lower channel of the support frame, and the other end of the support angle steel is fixed above a poured bridge section bottom plate through an anchoring rod.
Further, the internal mold comprises support angle steel, a lower internal mold, an internal side mold, an upper internal mold, connecting angle steel and an internal support, the lower internal mold, the upper internal mold and the two internal side molds form a rectangular cylinder, the corners of the rectangular cylinder are fixed through the connecting angle steel, the support angle steel is connected to the lower internal mold and is provided with two pieces of support angle steel, and the support angle steel and the connecting angle steel at the edge of the upper internal mold are connected through the internal support.
The top of the side span buttress is provided with two embedded steel plates, the support frame is composed of two support longitudinal beams and an upper support cross beam, a middle support cross beam and a lower support cross beam which are arranged between the support longitudinal beams, the bottom of each support longitudinal beam is arranged on the embedded steel plates, the number of the support frames is two, and the two support frames are connected through a reinforcing support.
Furthermore, the top of the side span buttress is divided into two mounting positions by the support frame, and an inner temporary support, a permanent support and an outer temporary support are sequentially arranged at the edge from the support frame to the top surface of the side span buttress on each mounting position.
Further, the bottom die and the top of the permanent support are flush.
Further, the front cross member and the rear lower cross member are at the same level.
Further, an end die is installed on the side surface of the support frame.
The cantilever bridge side span formwork system is built through the steps.
The invention has the following beneficial effects:
the side span closure segment construction is carried out by adopting a hanging basket-free mode, and the side span buttress top support frame and the poured bridge segment are used as gravity support structures for the side span closure segment construction of the cantilever bridge, so that the hoisting workload is reduced, and the construction period and the construction cost are reduced.
The support frame is formed by welding the support longitudinal beam and the support cross beam, the structure is simple, synchronous construction of the side span section cast-in-place beams on two sides of the side span buttress is facilitated, the construction period is shortened, the side span buttress is reinforced through the reinforcing support, and the stability of the support structure is further improved.
Need not inner support frame during centre form installation, the structure is firm simple, simple to operate, reduces steel use amount and can high-efficient quick construction simultaneously.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a cantilever bridge edge-span formwork system;
FIG. 2 is a schematic view of a pier top support frame;
FIG. 3 is a schematic view of a side span buttress top support system;
FIG. 4 is a schematic view of a template holder system;
FIG. 5 is a schematic view of a bottom die arrangement;
FIG. 6 is a schematic illustration of a flange bottom die and an outer die arrangement;
FIG. 7 is a schematic cross-sectional view of the inner mold;
FIG. 8 is a schematic cross-sectional view of a cantilever bridge side-span formwork system;
in the drawings, the components represented by the respective reference numerals are listed below:
1-reinforcing support; 2-supporting the beam; 3-end mold; 4-supporting the longitudinal beam; 5, pre-burying a steel plate; 6-inner temporary support; 7-permanent support; 8-an outer temporary support; 9-top stringer; 10-bottom die; 11-bottom stringer; 12-transverse distribution beams; 13-front sling; 14-support angle steel; 15-a bracket stringer; 16-a lower inner mold; 17-a front cross beam; 18-temporary anchor blocks; 19-rear upper beam; 20-an anchor rod; 21-rear sling; 22-rear lower beam; 23-side span buttress; 24-an inner mold; 25-an outer mold support; 26-inner side mold; 27-upper inner mold; 28-connecting angle steel; 29-inner support; 30-a bridge section is poured; 31-flange bottom die; 32-outside die.
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.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
The invention does not need to describe the technical requirements of welding between the reinforcing steel bars, concrete pouring key points, rammed earth, pile foundation construction quality standards and the like, and mainly explains the implementation mode of the structure of the invention.
Referring to fig. 1-8, the present invention is a cantilever bridge side span formwork system:
the top of the side span buttress 23 is provided with two pre-buried steel plates 5, and weld the support longerons 4 on two pre-buried steel plates 5, link together through three horizontal setting of the way supporting beam 2 between two support longerons 4 on the corresponding position on two pre-buried steel plates 5, constitute the support frame by support longeron 4 and supporting beam 2, later link together through strengthening support 1 between the support frame that forms, and cut apart into two parts with the top of side span buttress 23, have set gradually interior temporary support 6 by support frame to side span buttress 23 edge in each part, permanent support 7, outer temporary support 8.
The end of the poured bridge section 30 has a top plate and a bottom plate, wherein a rear upper beam 19 is fixed below the top plate by a rear sling 21, a rear lower beam 22 is fixed below the bottom plate by a rear sling 21, wherein a bottom longitudinal beam 11 is erected on the rear lower beam 22 and an outer temporary support 8, wherein the bottom longitudinal beam 11 is provided with a row, a support longitudinal beam 15 is erected between a support beam 2 and the rear upper beam 19 in the middle on the support frame, a temporary fixing pier 18 is further arranged on the upper surface of the top plate, a top longitudinal beam 9 is erected on the temporary fixing pier 18 and the support beam 2 positioned at the top of the support frame, a front sling 13 is installed in the middle area of the corresponding top longitudinal beam 9 and support longitudinal beam 15, a front beam 17 is fixed on the front sling 13, wherein the rear lower beam 22 of the front beam 17 is at the same horizontal height, a row of transverse distribution beams 12 is erected on the bottom longitudinal beam 11, a bottom die 10 is laid on the transverse distribution beams 12, a bottom die 10 is also laid between the support frame and the permanent support 7, the bottom die 10 is supported by the inner temporary support 6, an outer die support 25 is erected on the support longitudinal beam 15, a flange bottom die 31 and an outer side die 32 are mounted on the outer die support 25, the cross section of the specific outer die support 25 is in a step shape, the outer side die is mounted on the outer surface of the specific outer die support 25, the flange bottom die 31 is arranged on the step surface, the specific outer die support is tensioned and fixed through a pull rod, and the support longitudinal beam 15 abuts against the lower surface of the flange bottom die 31.
The internal mold 24 is arranged above the bottom mold 10 through the suspension of the support angle steel 14, one end of the support angle steel 14 is arranged on the support beam 2 at the lowest part of the support frame, the other end of the support angle steel is fixed above the bottom plate of the poured bridge section 30 through the anchoring rod 20, and the end mold 3 is arranged on the side surface of the support frame.
The inner die 24 comprises support angle steel 14, a lower inner die 16, an inner die 26, an upper inner die 27, connecting angle steel 28 and an inner support 29, which are integrally welded.
The lower inner mold 16, the upper inner mold 27 and the two inner side molds 26 form a rectangular cylinder, and the corners thereof are fixed by connecting angle steels 28.
The support angle 14 is connected to the lower inner mold 16, and two support angles 14 are provided and connected to two connecting angles 28 at two edges of the upper inner mold 27 through inner supports 29.
The construction method of the cantilever bridge side span formwork system comprises the following steps:
firstly, pre-embedding a pre-embedded steel plate 5 at the top of a poured side-span buttress 23, installing a support frame with an upper supporting beam, a middle supporting beam and a lower supporting beam 2 on the pre-embedded steel plate 5, wherein the upper supporting beam, the middle supporting beam and the lower supporting beam 2 arranged between the two supporting beams 4 can be assembled in advance, then hoisting the support frame to the top surface of the side-span buttress 23 and installing the support frame on the pre-embedded steel plate 5, and in addition, connecting and reinforcing the two support frames through a reinforcing support 1 again, wherein after the subsequent building process is finished, an end mold 3 is installed on one side of the support frame;
wherein, pour the installation of 23 tops of side span buttress and set up outer temporary support 8, outer temporary support 8 still sets gradually permanent support 7 and interior temporary support 6 near the side span buttress 23 top of interior department.
Step two, mounting a temporary fixing pier 18 above a top plate of a poured bridge section 30, fixing a rear upper cross beam 19 below the top plate of the poured bridge section 30 through a rear sling 21, anchoring a rear lower cross beam 22 below a bottom plate of the poured bridge section 30, and then erecting a bottom longitudinal beam 11, a support longitudinal beam 15 and a part longitudinal beam 9;
the two ends of a top longitudinal beam 9 are respectively connected to a temporary fixing pier 18 and a supporting cross beam 2 on the upper track of the supporting frame, the two ends of a support longitudinal beam 15 are respectively connected to the supporting cross beam 2 on the middle track of the supporting frame and a rear hanging strip 21 arranged on a top plate, the two ends of a bottom longitudinal beam 11 are respectively connected to an outer temporary support 8 and the rear hanging strip 21 arranged on a bottom plate, and a transverse distribution beam 12 is fully paved on the bottom longitudinal beam 11.
And step three, mounting a front hanging strip 13 in the middle area of the top longitudinal beam 9 and the support longitudinal beam 15, and hanging a front cross beam 17 on the front hanging strip 13.
And step four, mounting a bottom die 10 on the transverse distribution beam 12, and laying the bottom die 10 between the support frame and the permanent support 7 and supported by the inner temporary support 6.
And step five, installing an outer mold support 25 on the support longitudinal beam 15, and fixing the flange bottom mold 31 and the outer mold 32 on the outer mold support 25 through a counter-pull rod.
And step six, binding steel bars on the bottom plate of the side span section, and installing an inner mold 24 on the bottom mold 10, wherein the inner mold 24 is prefabricated or manufactured on the bottom mold 10 on site, specifically, the inner mold 10 is suspended above the bottom mold 10 through support angle steel 14, one end of the support angle steel 14 is arranged on the support beam 2 at the lowest part of the support frame, and the other end of the support angle steel is fixed above the bottom plate of the poured bridge section 30 through an anchoring rod 20.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. The construction method of the cantilever bridge side span formwork system is characterized by comprising the following steps:
the method comprises the steps that firstly, an embedded steel plate (5) is embedded at the top of a poured side-span buttress (23), a support frame with an upper supporting beam, a middle supporting beam and a lower supporting beam (2) is installed on the embedded steel plate (5), an outer temporary support (8) is installed at the top of the poured side-span buttress (23), the support frame is composed of two supporting longitudinal beams (4) and the upper supporting beam, the middle supporting beam and the lower supporting beam (2) which are arranged between the supporting longitudinal beams (4), the bottom of each supporting longitudinal beam (4) is arranged on the embedded steel plate (5), the two support frames are connected through a reinforcing support (1), the top of the side-span buttress (23) is divided into two installation positions by the support frame, and an inner temporary support (6), a permanent support (7) and an outer temporary support (8) are sequentially arranged from the support frame to the edge of the top surface of the side-span buttress (23) on each installation position;
step two, installing a temporary fixing pier (18) above a top plate of a poured bridge section (30), fixing a rear upper cross beam (19) below the top plate of the poured bridge section (30) through a rear hanging strip (21), anchoring a rear lower cross beam (22) below a bottom plate of the poured bridge section (30), respectively connecting two ends of a top longitudinal beam (9) to the temporary fixing pier (18) and a supporting cross beam (2) of an upper way of a supporting frame, respectively connecting two ends of a support longitudinal beam (15) to the supporting cross beam (2) of a middle way of the supporting frame and the rear hanging strip (21) arranged on the top plate, respectively connecting two ends of a bottom longitudinal beam (11) to an outer temporary support (8) and the rear hanging strip (21) arranged on the bottom plate, and fully paving a transverse distribution beam (12) on the bottom longitudinal beam (11);
thirdly, mounting a front hanging strip (13) in the middle area of the top longitudinal beam (9) and the support longitudinal beam (15), and hanging a front cross beam (17) on the front hanging strip (13);
fourthly, mounting a bottom die (10) on the transverse distribution beam (12), and paving the bottom die (10) between the support frame and the permanent support (7) and supporting the bottom die by the inner temporary support (6);
fifthly, an outer mold support (25) is installed on the support longitudinal beam (15), and the flange bottom die (31) and the outer mold (32) are fixed on the outer mold support (25) through a counter-pulling pull rod;
sixthly, binding steel bars on the bottom plate of the side span section, installing the inner mold (24) on the bottom mold (10), wherein the inner die (24) is suspended above the bottom die (10) through a support angle steel (14), one end of the support angle steel (14) is arranged on a support beam (2) of the lower course of the support frame, the other end is fixed above a bottom plate of a poured bridge section (30) through an anchoring rod (20), wherein the inner die (24) comprises support angle steel (14), a lower inner die (16), inner side dies (26), an upper inner die (27), connecting angle steel (28) and an inner support (29), the lower inner die (16), the upper inner die (27) and the two inner side dies (26) form a rectangular cylinder, the corners of the supporting angle steel are fixed through connecting angle steel (28), the supporting angle steel (14) is connected to the lower inner die (16), two supporting angle steel (14) are arranged, and the supporting angle steel (14) is connected with the connecting angle steel (28) at the edge of the upper inner die (27) through an inner support (29).
2. The cantilever bridge side-span formwork system construction method according to claim 1, wherein the top of the bottom formwork (10) and the top of the permanent support (7) are equal in height.
3. The cantilever bridge side-span formwork system construction method according to claim 1, wherein the front cross beam (17) and the rear lower cross beam (22) are at the same level.
4. The cantilever bridge side-span formwork system construction method according to claim 1, characterized in that an end formwork (3) is installed on the side surface of the supporting frame.
5. The cantilever bridge side span formwork system is characterized by being constructed by the construction method of the cantilever bridge side span formwork system according to any one of claims 1 to 4.
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| CN107724244A (en) * | 2017-10-26 | 2018-02-23 | 中铁第四勘察设计院集团有限公司 | Temporary T structure and its construction method without bearing continuous rigid frame end bay beam section composition |
| CN211171632U (en) * | 2019-08-14 | 2020-08-04 | 中交二公局东萌工程有限公司 | Continuous rigid frame bridge side-span cast-in-place section and closure section are pour and are used gallows |
| CN111395181A (en) * | 2020-03-27 | 2020-07-10 | 中交二公局东萌工程有限公司 | Self-anchoring construction method for side-span cast-in-place section and closure section of continuous rigid frame bridge |
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