CN114541250A - Ultrahigh-performance concrete combined pier and construction process thereof - Google Patents
Ultrahigh-performance concrete combined pier and construction process thereof Download PDFInfo
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- CN114541250A CN114541250A CN202210057607.8A CN202210057607A CN114541250A CN 114541250 A CN114541250 A CN 114541250A CN 202210057607 A CN202210057607 A CN 202210057607A CN 114541250 A CN114541250 A CN 114541250A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000010276 construction Methods 0.000 title claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 44
- 239000010959 steel Substances 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000002131 composite material Substances 0.000 claims description 5
- 239000006261 foam material Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000005187 foaming Methods 0.000 abstract description 9
- 239000007787 solid Substances 0.000 abstract description 9
- 239000004567 concrete Substances 0.000 description 19
- 238000009434 installation Methods 0.000 description 18
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 239000011178 precast concrete Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to an ultra-high performance concrete combined pier and a construction process thereof, belonging to the technical field of bridge engineering prefabricated pier manufacturing. The combined pier comprises a UHPC pier body, wherein the UHPC pier body is formed by pouring a steel bar mesh cage and UHPC materials, a light permanent inner die is arranged inside the UHPC pier body, and the UHPC pier body and the light permanent inner die are not detached after construction and are installed in a pier permanent structure together; the structure of the pier is the same as that of a solid pier, but the problem that the inner die of the hollow pier produced by the traditional pouring method is difficult to machine, install and remove is solved, the construction process of the whole pier is simple, and the field construction period is short; the lightweight permanent inner mold is made of lightweight cement-based foaming materials, the volume weight is only 1/5, the self weight of the pier is low, a stiffening rib structure can be manufactured independently in the structure, the problem of local stability of thin-wall plates is solved, and the designability of the pier structure is improved.
Description
Technical Field
The invention belongs to the technical field of bridge engineering prefabricated bridge pier manufacturing, and particularly relates to an ultrahigh-performance concrete combined bridge pier and a construction process thereof.
Background
In the traditional bridge structure, the upper structure (hollow slab, small box girder, T girder, combined structure and the like) of the middle and small span bridge is mostly of a prefabricated structure; the lower structure (including capping beam, bridge pier, bearing platform, etc.) is constructed by cast-in-place method, and the following disadvantages are existed in the construction process:
(1) a large number of supports are erected, so that the influence on traffic is large;
(2) the field operation requires a large amount of labor force;
(3) the construction efficiency is low, and the construction period is long;
(4) dust, slurry, noise and the like have great influence on the environment;
(5) the overall energy consumption of the industry is high.
With the progress of science and technology, the industrialized production mode of bridge structures is gradually promoted, the concept of the assembled bridge is also developed from the state that the upper structure is taken as the main structure and the upper structure, the lower structure and the auxiliary structure are taken into consideration, and a large number of construction methods for prefabricating and assembling the lower structure of the bridge appear. Compared with the traditional cast-in-place construction method, the prefabricated pier has the following advantages:
(1) the method has the advantages that the method can be produced in a factory and can be synchronously manufactured with a field preposing procedure, the field installation period is short, the cost is controllable, and the labor is saved;
(2) the field installation time is shorter than that of cast-in-place, the construction speed is high, and the influence on the existing traffic and the surrounding environment is small;
(3) the quality is easier to ensure in factory production compared with cast-in-place production;
(4) the standardized design is combined, the repeated utilization rate of the tools such as the template is obviously improved, and the waste is reduced. The common precast structure pier all adopts ordinary concrete preparation at present, mainly has two kinds of forms:
(1) precast concrete hollow pier produced by centrifugal method
The method is manufactured by a centrifugal method similar to a telegraph pole production process, and a large-scale centrifugal device is used for enabling concrete to naturally form a circular cavity in the interior without an inner template, so that the problem of demoulding of the inner template is solved, the production efficiency is obviously improved, and the method is widely applied to standardized small-span bridge piers of roads. The disadvantages are that: the requirement on equipment is high, large centrifugal production equipment is expensive, and the cost in the early period is high; the pier produced by the centrifugal method is limited by the prior art, has small overall dimension and limited shape, can only be used for roads or small bridges in suburban areas with unlimited underbridge space, has high cost of larger-size components, is difficult to realize, and has great limitation on application range.
(2) Precast concrete solid pier or hollow pier produced by pouring method
The method adopts the traditional process, utilizes the template in a factory, installs the reinforcement cage, and produces the solid or hollow pier by cast-in-place, and is essentially the factory production of the traditional cast-in-place process. Generally, solid bridge piers are simple to produce, hollow bridge piers generally need to adopt a complex inner template demoulding mechanism due to the fact that inner template demoulding difficulty is large, and cost is high. Compared with a cast-in-place structure, the cast-in-place structure has the advantages of factory production, construction period and quality, but the components need to be transported to the site for installation from a prefabricated site, large-sized equipment is needed for transportation and site installation due to large section size and large weight of the medium and large-sized concrete piers, and the cast-in-place structure has high requirements on road bridges and bridge lifting sites on transportation lines. In actual engineering, the weight of a prefabricated pier is often controlled by a bridge on a transportation line, a hoisting site needs special treatment to meet the working requirements of large hoisting equipment, and the prefabricated pier process is limited by transportation and installation conditions, so that the economy is poor, and the application range of the prefabricated pier is influenced.
The UHPC (ultra high performance concrete) material is a novel cement-based material, has very high compressive strength, and is an ideal material for replacing common concrete to manufacture prefabricated piers in terms of material performance, but the main reason that the UHPC material is difficult to be applied to actual engineering at present is that the solid piers are manufactured by using high-strength materials, the material consumption is very large, the economy is poor, a thin-wall structure is required to be manufactured, and the UHPC material is reinforced by using steel fibers and is not suitable for manufacturing hollow components by adopting a centrifugal method; the traditional inner and outer mold cast-in-place construction method has similar problems with the precast concrete hollow pier, and the inner mold plate is difficult to manufacture, install and demold.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, the invention provides an ultrahigh-performance concrete combined pier and a construction process thereof.
The purpose of the invention can be realized by the following technical scheme:
the ultra-high performance concrete combined pier comprises a UHPC pier body with a closed thin-wall structure, wherein the UHPC pier body is formed by pouring a steel bar mesh cage and UHPC materials, a light permanent inner mold is arranged inside the UHPC pier body, the light permanent inner mold is of an integral structure, is not detached after construction, and is installed into a pier permanent structure together with the UHPC pier body.
Furthermore, the light permanent inner mold is prefabricated by a light cement-based foaming material by a cast-in-place method, can be poured in a factory or in a construction site, can be independently manufactured in an external structure, and has high machinability and flexibility.
Further, the light cement-based foaming material is prepared from cement and foaming polyurethane, and the volume weight is 0.3-0.7 kN/m3Adjusting according to the actual construction needs; since the strength of the UHPC is much higher than that of the general concrete, the volume weight of the light cement-based foaming material is about 1/5, and although part of the weight is increased without removing the light permanent inner mold, the total weight of the equal-strength UHPC pier is still advantageous compared with the concrete pier.
Furthermore, the UHPC bridge pier body is provided with stiffening ribs, the arrangement form of the stiffening ribs can be flexibly selected according to the design calculation result, and the forming method of the stiffening ribs comprises the following steps: the rib modules are arranged on the inner die template during pouring of the lightweight permanent inner die, rib grooves are formed in the lightweight permanent inner die after forming, and the rib grooves are used as the template to form stiffening ribs during pouring of the UHPC pier body to form an embedded structure, so that the problem of local stability of thin-walled parts is solved.
A construction process of an ultra-high performance concrete combined pier comprises the following steps:
step S1: building and installing a steel outer template on the pier base;
step S2: installing a steel bar mesh cage on the inner wall of the steel outer template and reserving connecting steel bars;
step S3: hoisting the lightweight permanent internal mold on the inner side of the steel bar mesh cage, and positioning and fixing the lightweight permanent internal mold;
step S4: and pouring UHPC into the steel bar net cage, then maintaining and detaching the outer die to complete the construction of the combined pier.
As the preferred scheme of the invention, both ends of the light permanent internal mold are flush with the connecting steel bars, and the light permanent internal mold is used as a temporary support during installation, on one hand, the light permanent internal mold can be directly placed on a bearing platform during installation of the stand column, and a steel external template can be installed without using a special rigid mold frame for supporting, on the other hand, the cover beam can be directly placed on the top of the light permanent internal mold during installation, and a joint can be poured without using an installation bracket, so that the field installation efficiency is greatly improved, and the construction efficiency is further improved.
The invention has the beneficial effects that:
1. the light permanent inner die is used without dismounting the inner template, and the light permanent inner die can be manufactured only by the outer template, so that the problem that the hollow pier inner die is difficult to machine, install and dismount by the traditional pouring method is solved, the structure of the combined pier is not different from that of a solid pier, and the construction process of the whole pier is simple;
the lightweight permanent inner mold is made of a cement-based foam material with volume weight of about 1/5, and although part of the weight is increased without dismantling, the total weight is advantageous compared with a concrete pier, and the cost of the cement-based foam material is lower.
2. The light permanent inner mold is set to be equal in length to connecting reinforcing steel bars and can be used as a temporary supporting piece during installation, on one hand, the light permanent inner mold can be directly placed on a bearing platform during installation of the stand column, a steel outer template can be installed without being supported by a special rigid mold frame, on the other hand, the cover beam can also be directly placed at the top of the light permanent inner mold during installation, a joint can be poured without an installation bracket, the field installation efficiency is greatly improved, and the construction efficiency is further improved.
3. The light permanent centre form can be poured through the rib module and form the rib groove when prefabricated, pours UHPC pier body and forms stiffening rib, solves the local stability problem of thin wall plate through stiffening rib, and stiffening rib's structure can make alone, and stiffening rib's quantity can be adjusted according to the demand, improves the commonality of template on the one hand, and on the other hand improves the designability of pier structure.
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 structural view of an ultra-high performance concrete combined bridge pier of the present invention;
FIG. 2 is a schematic structural view of a UHPC pier body of the present invention;
FIG. 3 is a schematic structural view of the lightweight permanent inner mold of the present invention;
FIG. 4 is a schematic structural diagram of a bridge pier according to a preferred embodiment of the invention;
figure 5 is a tensile UHPC stress-strain curve.
In the figure: 10. a UHPC pier body; 20. a lightweight permanent inner mold; 30. connecting reinforcing steel bars; 40. a rib groove; 50. a stiffening rib.
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.
Example 1
In this embodiment, a pier is erected on an elevated main line of an expressway, the standard span is 30m, the cross section of the pier is a rectangular structure 1.5 × 1.8m, and the pier height is 11m, please refer to fig. 5, and the steel bar proportion design and the checking calculation of the pier are as follows:
the checking calculation is assumed as follows:
(1) the assumption of a flat section is met in the process of bending the section;
(2) no relative slip exists between the steel bar and the UHPC;
(3) consider the contribution of UHPC tensile stress;
(4) if one of the steel bar or UHPC material reaches its ultimate strain, the structure fails;
the stress-strain curve of UHPC adopts an ideal plastic model similar to a reinforcing steel bar, the elastic section is calculated according to the actual elastic modulus of the material and the linear elasticity, the material of the compression section yields after reaching the elastic maximum pressure strain, the stress-strain curve becomes horizontal, the material is damaged after reaching the limit pressure strain, and the pressure stress is 0; the material in the tension section yields after reaching 0.9 times of elastic limit, the stress-strain curve becomes horizontal, the material is damaged after reaching 3 times of ultimate tensile strain, and the tensile stress is 0;
through design checking, the reinforcing steel bar proportion of the determined pier is as follows: the longitudinal main reinforcement is 14 HRB400 steel bars with the length direction being 32mm, and 10 HRB400 steel bars with the length direction being 32 mm.
Example 2
The embodiment adopts the prior art scheme, and the solid common concrete is poured according to the design scheme of the embodiment 1, and the concrete implementation process is as follows:
step S1: the area of the exposed fresh concrete after the chiseling treatment of the capital construction bearing platform is not less than 75% of the total area;
step S2: erecting a scaffold along the outer side of the pier body by using a steel pipe with the diameter of 50mm, wherein the transverse distance between every two adjacent scaffolds is 1m, the height of each scaffold is 0.5m, positioning steel bars are additionally arranged according to 1250px, and a steel bar mesh cage is bound;
step S3: hoisting and splicing the steel external template, and constructing according to the external template construction standard strictly, so that the phenomenon of mould bulging or mould folding cannot occur;
step S4: pouring C40 concrete into the steel outer mold, wherein the volume weight of the concrete is 24kN/m3C40 concrete is constructed by pumping, the concrete is strictly carried out according to the pumping process in the pouring process, and concrete is prevented from segregation by adopting a chute and a string cylinder in the blanking process;
step S5: and (5) curing and solidifying the cast concrete according to the C40 concrete curing process to obtain the solid pier.
Example 3
In this embodiment, according to the design scheme of example 1, the combined pier is constructed while maintaining the same bearing capacity as the pier manufactured in example 2, and as shown in fig. 1 to 3, the specific implementation process is as follows:
step S1: building and installing a steel outer template on the pier base;
step S2: because the section size of the pier is smaller, a steel bar mesh cage is bound according to the steel bar proportioning design of the embodiment 1 in a factory, connecting steel bars 30 are reserved at two ends, and then the pre-installed steel bar mesh cage is hung in a steel outer template to position and fix the steel bar mesh cage;
step S3: assembling an inner mould template, wherein the length of the inner mould template is the same as that of the steel bar net cage, assembling a group of longitudinal rib modules on two long sides of the pier respectively, the section size of each longitudinal rib module is 80mm multiplied by 300mm, the length of each longitudinal rib module is the same as that of the inner mould template, forming a rib groove 40 after pouring, and then preparing light cement-based foaming material by taking cement and foaming polyurethane, wherein the volume weight of the light cement-based foaming material is usually 0.3-0.7 kN/m3In this embodiment, to ensure similar carrying capacity, the volume weight is designed to be 0.4kN/m3Pouring a light cement-based foaming material into the inner mold plate, curing and forming according to the maintenance specification, and finally removing the inner mold plate to obtain a light permanent inner mold 20;
step S4: hoisting the lightweight permanent internal mold 20 into the inner side of the steel bar net cage, positioning the lightweight permanent internal mold 20, controlling the distance between the side wall of the lightweight permanent internal mold 20 and the steel external template to be 80mm, pouring UHPC into the steel bar net cage, then curing and forming according to maintenance specifications, forming a UHPC pier body 10 on the outer layer of the lightweight permanent internal mold 20, forming stiffening ribs 50 in the rib grooves 40, and then removing the steel external template to complete the construction of the combined pier.
Example 4
The specific implementation process of this embodiment is the same as that of embodiment 3, please refer to fig. 2 to 4, in the process S3, the length of the inner mold template is the same as the distance between the two ends of the connecting steel bar 30, and the two ends of the poured lightweight permanent inner mold 20 are flush with the end of the connecting steel bar 30, so that, during subsequent joint pouring, on one hand, the upright post can be directly placed on the bearing platform during installation, and the steel outer mold plate can be installed without using a special rigid mold frame for support, and on the other hand, the cover beam can be directly placed on the top of the lightweight permanent inner mold 20 during installation, and the joint can be poured without using a mounting bracket, thereby greatly improving the field installation efficiency and further improving the construction efficiency.
The self weights of the pier concrete constructed in example 2 and example 4 were calculated:
example 2 deadweight 24kN/m3＊1.8m＊1.5m＊11m＝712.8kN；
Example 4 self weight ═ 26kN/m3＊0.55m2+0.4kN/m3＊2.15m2)＊11m＝166.76kN；
From the above data, it can be seen that the self weight of the concrete for the composite pier constructed by the present invention is only 23.4% of that of the solid pier.
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 foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (8)
1. The ultra-high performance concrete combined pier is characterized by comprising a UHPC pier body (10) which is formed by pouring a steel bar net cage and UHPC materials, wherein a light permanent inner mold (20) is arranged inside the UHPC pier body (10), is not detached after construction and is installed in a pier permanent structure together with the UHPC pier body (10).
2. The ultra-high performance concrete composite pier according to claim 1, wherein the UHPC pier body (10) is of a closed thin-wall structure.
3. The ultra-high performance concrete composite pier according to claim 1, wherein the lightweight permanent inner mold (20) is of a unitary structure.
4. The ultra-high performance concrete composite pier according to claim 3, wherein the lightweight permanent inner mold (20) is prefabricated by a lightweight cement-based foam material by a cast-in-place method.
5. The pier combined with ultra-high performance concrete as claimed in claim 4, wherein the light cement-based foam material is made of cement and foamed polyurethane and has a volume weight of 0.3-0.7 kN/m3。
6. The ultra-high performance concrete combined pier is characterized in that a stiffening rib (50) is arranged on the UHPC pier body (10), and the shaping method of the stiffening rib (50) comprises the following steps: the rib modules are arranged on the inner die templates when the lightweight permanent inner die (20) is poured, rib grooves (40) are formed in the lightweight permanent inner die (20) after the lightweight permanent inner die is formed, and stiffening ribs (50) are formed when the UHPC pier body (10) is poured.
7. A construction process of an ultrahigh-performance concrete combined bridge pier is characterized by comprising the following steps:
step S1: building and installing a steel outer template on the pier base;
step S2: installing a steel bar mesh cage on the inner wall of the steel outer template and reserving connecting steel bars (30);
step S3: hoisting a light permanent internal mold (20) at the inner side of the steel bar mesh cage, and positioning and fixing the light permanent internal mold (20);
step S4: and pouring UHPC into the steel bar mesh cage, and then maintaining and detaching the outer die to complete the construction of the combined pier.
8. The construction process of the ultra-high performance concrete composite pier according to claim 7, wherein both ends of the lightweight permanent inner mold (20) are flush with the connecting bars (30), and the lightweight permanent inner mold (20) is used for temporary support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210057607.8A CN114541250A (en) | 2022-01-18 | 2022-01-18 | Ultrahigh-performance concrete combined pier and construction process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210057607.8A CN114541250A (en) | 2022-01-18 | 2022-01-18 | Ultrahigh-performance concrete combined pier and construction process thereof |
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| CN215441415U (en) * | 2021-04-20 | 2022-01-07 | 福建工大岩土工程研究所有限公司 | Quick-connect combined column pier structure |
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2022
- 2022-01-18 CN CN202210057607.8A patent/CN114541250A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101664957A (en) * | 2009-09-09 | 2010-03-10 | 蔡天平 | Molding mould and molding-manufacturing method of ultrathin concrete container |
| CN202899023U (en) * | 2012-11-08 | 2013-04-24 | 中国建筑第七工程局有限公司 | Small section thin-walled hollow pier inner die for bridges |
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