CN217104675U - Semi-prefabricated UHPC-NC combination bent cap joint construction - Google Patents

Semi-prefabricated UHPC-NC combination bent cap joint construction Download PDF

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CN217104675U
CN217104675U CN202121408192.1U CN202121408192U CN217104675U CN 217104675 U CN217104675 U CN 217104675U CN 202121408192 U CN202121408192 U CN 202121408192U CN 217104675 U CN217104675 U CN 217104675U
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shell
prefabricated
prefabricated uhpc
uhpc
pier stud
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来猛刚
霍龙飞
姚晓飞
李刚
姚文奇
李超
刘浩
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CCCC First Highway Consultants Co Ltd
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CCCC First Highway Consultants Co Ltd
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Abstract

The utility model relates to a semi-prefabricated UHPC-NC combination bent cap connection structure, the structure includes prefabricated UHPC shell, pier stud and pier stud bracket platform; the prefabricated UHPC shell comprises a bottom plate, side plates at the front side and the rear side and end plates at the left end and the right end, and forms a shell-shaped structure with an open top; the prefabricated UHPC shell is arranged on a pier stud bracket support platform at the top of the pier stud, pier stud reserved steel bars at the top of the pier stud are upwards inserted into the prefabricated UHPC shell, and concrete is poured into the prefabricated UHPC shell to be connected into a whole. The utility model discloses can compatible whole cast-in-place and the advantage of prefabricated bent cap of whole to rationally avoid the shortcoming of the prefabricated bent cap of segmentation, have wide application and popularization prospect in the bent cap bridge construction of growing up of the short region in land such as city intensive area, seaside highway, effectively solve the actual difficult problem that the land resource that highway and city main road, ordinary highway, view highway etc. "build altogether" and "cross construction" lead to is scarce.

Description

Semi-prefabricated UHPC-NC combination bent cap connection structure
Technical Field
The utility model relates to a bridge construction technical field, concretely relates to half prefabricated UHPC-NC combination bent cap joint construction.
Background
In the current bridge construction process, cast-in-place construction is still mainly used. The cast-in-place construction needs to set up a large number of supports and templates, the pouring quality of components is difficult to guarantee, the labor demand is large, the traffic interference is serious, the construction efficiency is low, the period is long, the dust and noise pollution is large, the production and life of residents around a construction site are seriously influenced, the healthy and sustainable development of the traffic industry is seriously restricted, and the social progress is hindered.
At present, the prefabrication and assembly technology of the superstructure and the pier tends to be mature and applied in a large amount, but the difficulty in assembly of the bent cap is not well solved all the time, and the prefabricated assembly technology of the superstructure and the pier cannot be well matched with the development of the superstructure and the pier stud of the bridge. Therefore, the problems of assembly and light weight of the long and large bent cap need to be solved.
With the economic development of China, the construction of six-lane highways, urban viaducts and the like becomes a common demand, the conditions of collinearity of highways, urban roads, common highways and the like gradually increase, and large cantilevers and small pier distance cover beams become a preferred scheme of the collinearity bridge due to safe structure, small occupied area, attractive appearance and the like. The long capping beam is the key point of road traffic in the future, and the scale and the market are huge.
For the bent cap with the span of more than 30m, the integral prefabrication construction is difficult, and the number of sections is more and the construction process is complicated due to the adoption of section prefabrication and assembly. The long and large bent cap can not be effectively solved only by the existing prefabrication mode.
Disclosure of Invention
The utility model aims at providing a half prefabricated UHPC-NC combination bent cap joint construction, to the cantilever concrete bent cap of growing up in the overhead "co-construction" of city and "cross construction" engineering, it is big to solve prefabricated bent cap monomer hoist and mount weight, and the difficult problem of transportation and hoist and mount difficulty reduces the construction risk for the efficiency of construction, the guarantee is current under the bridge.
The utility model discloses the technical scheme who adopts does:
the utility model provides a half prefabricated UHPC-NC combination bent cap joint construction which characterized in that:
the construction comprises a prefabricated UHPC shell, a pier column and a pier column bracket support platform;
the prefabricated UHPC shell comprises a bottom plate, side plates at the front side and the rear side and end plates at the left end and the right end, and forms a shell-shaped structure with an open top;
the prefabricated UHPC shell is arranged on a pier stud bracket support platform at the top of the pier stud, pier stud reserved steel bars at the top of the pier stud are upwards inserted into the prefabricated UHPC shell, and concrete is poured into the prefabricated UHPC shell to be connected into a whole.
U-shaped transverse stiffening ribs are arranged in the prefabricated UHPC shell at intervals and welded on a bottom plate and side plates of the prefabricated UHPC shell.
Closed anchor ears are arranged outside the prefabricated UHPC shell at intervals, and the closed anchor ears at the pier tops of the pier columns are restrained on the pier column bracket platform.
Be provided with inside steel reinforcement cage in the prefabricated UHPC shell, prefabricated UHPC shell top is provided with UHPC shell embedded steel bar joint, and I grade steel bar connection joint is passed through at inside steel reinforcement cage top and is connected to on the UHPC shell embedded steel bar joint.
An anchor backing plate and a prestressed pore passage which are embedded in the end part of the shell are arranged on an end plate of the prefabricated UHPC shell, prestressed steel bars are arranged in the prefabricated UHPC shell, and two ends of each prestressed steel bar are anchored on the end plate of the prefabricated UHPC shell.
The bottom plate of the prefabricated UHPC shell is thickened at the position of the pier stud, a reserved hole of the bottom plate of the UHPC shell is formed, and the reserved steel bar of the pier stud is inserted into the prefabricated UHPC shell through the reserved hole of the bottom plate of the UHPC shell.
And a prefabricated UHPC shell pre-embedded corrugated pipe is arranged in a side plate of the prefabricated UHPC shell.
The utility model has the advantages of it is following:
the UHPC not only has high strength, but also has the characteristics of ultrahigh impermeability and impact resistance, high compactness, good working performance, quick development of early strength and the like; the non-dismantling template has the characteristics of simplified construction process, simple and convenient operation, improved labor conditions, no need or less use of template support, template support saving, labor amount dismantling, construction progress acceleration and the like, combines the advantages of the two and provides the utility model discloses a semi-prefabricated UHPC-NC combined cover beam, can be compatible with the advantages of integral cast-in-place and fully prefabricated cover beam, and reasonably avoids the shortcoming of sectional prefabricated cover beam, has wide application and popularization prospect in the construction of the super-30 m long and large cover beam bridge in the land shortage areas such as dense city areas, seaside roads and the like, and effectively solves the practical difficult problem of land resource shortage caused by 'co-construction' and 'cross construction' of highways, city trunk roads, common roads, landscape roads and the like. Meanwhile, the method has the advantages of low requirement on transportation hoisting equipment, template saving, good durability and the like, and can expand the capping beam assembly design idea and provide a new development direction for bridge assembly design.
Drawings
Fig. 1 is an elevation view of a capping beam.
Fig. 2 is a plan view of the capping beam.
Fig. 3 is a cross-sectional view of the capping beam a-a.
Fig. 4 is a cross-sectional view of the capping beam B-B.
Fig. 5 is a cross-sectional view of the capping beam C-C.
Fig. 6 is a schematic representation of the bottom plate of the UHPC enclosure.
Fig. 7 is a structural view of a prefabricated UHPC shell pre-buried corrugated pipe and a UHPC shell pre-buried steel bar joint.
Fig. 8 is a view of the internal reinforcement cage.
Fig. 9 is a structural view of reinforcing bar connection.
In the figure: 1-prefabricating a UHPC shell; 2-pier stud; 3-inner reinforcement cage; 4-post-pouring concrete; 5-U-shaped transverse stiffeners; 6, closing the anchor ear; 7-pier stud bracket platform; 8, prefabricating a pre-buried corrugated pipe of the UHPC shell; 9-UHPC shell embedded steel bar joint; 10-I grade steel bar connecting joint; 11, embedding an anchor backing plate and a prestressed duct at the end part of the shell; 12-reserving reinforcing steel bars for the pier stud; 13-UHPC housing floor preformed hole.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The utility model relates to a semi-prefabricated UHPC-NC combination bent cap connection structure, the structure includes prefabricated UHPC shell 1, pier stud 2 and pier stud bracket platform 7; the prefabricated UHPC shell 1 comprises a bottom plate, side plates at the front side and the rear side and end plates at the left end and the right end, and forms a shell-shaped structure with an open top; the prefabricated UHPC shell 1 is arranged on a pier column bracket support platform 7 at the top of the pier column 2, pier column reserved steel bars 12 at the top of the pier column 2 are upwards inserted into the prefabricated UHPC shell 1, and concrete is poured into the prefabricated UHPC shell 1 to be connected into a whole.
U-shaped transverse stiffening ribs 5 are arranged in the prefabricated UHPC shell 1 at intervals and welded on a bottom plate and side plates of the prefabricated UHPC shell 1.
The closed hoops 6 are arranged outside the prefabricated UHPC shell 1 at intervals, and the closed hoops 6 at the pier tops of the pier columns 2 are restrained on a pier column bracket platform 7.
Be provided with inside steel reinforcement cage 3 in the prefabricated UHPC shell 1, 1 tops of prefabricated UHPC shell are provided with UHPC shell embedded steel bar joint 9, and 3 tops of inside steel reinforcement cage are connected to on UHPC shell embedded steel bar joint 9 through I level steel bar attach fitting 10.
An anchor backing plate embedded in the end part of the shell and a prestress pore channel 11 are arranged on an end plate of the prefabricated UHPC shell 1, a prestress steel bar is arranged in the prefabricated UHPC shell 1, and two ends of the prestress steel bar are anchored on the end plate of the prefabricated UHPC shell 1. And tensioning the prestress after pouring concrete in the bent cap is finished.
The bottom plate of the prefabricated UHPC shell 1 is thickened at the position of the pier stud 2, a reserved hole 13 of the bottom plate of the UHPC shell is formed, the reserved hole corresponds to the position of a steel bar of the pier stud extending into the cover beam one by one and is matched with the position of the steel bar, and the reserved steel bar 12 of the pier stud is inserted into the prefabricated UHPC shell 1 through the reserved hole 13 of the bottom plate of the UHPC shell.
A prefabricated UHPC shell pre-embedded corrugated pipe 8 is arranged in a side plate of the prefabricated UHPC shell 1.
The assembling method of the semi-prefabricated UHPC-NC combined bent cap connecting structure comprises the following steps:
the method comprises the following steps: prefabricating a UHPC shell in a factory, embedding embedded parts of embedded components, binding a reinforcement cage inside a bent cap, and assembling the reinforcement cage and the UHPC shell into a whole in the prefabrication field before leaving the factory;
step two: transporting, hoisting and positioning the guard rails;
step three: the bent cap is fixedly connected with the pier stud through the hoop, and temporary measures are installed;
step four: and (4) pouring concrete in the bent cap in a layered mode, removing the temporary measures after the post-poured concrete reaches the strength, and tensioning the bent cap to achieve prestress, so that the construction of the bent cap is completed.
And erecting a bracket support platform at the top of the pier stud to serve as a construction platform and temporary support for the bottom of the bent cap during concrete pouring.
Referring to the drawings:
the utility model comprises a prefabricated UHPC shell 1, an internal reinforcement cage 3, post-cast ordinary concrete 4 and pier studs 2, wherein the prefabricated UHPC shell is a hollow and uncovered shell-shaped structure, and a shell side plate is provided with ordinary reinforcements and prestressed reinforcements; a side plate of the prefabricated UHPC shell is provided with a through-long U-shaped transverse stiffening rib 5; embedding an anchor backing plate and a prestressed duct 11 at the end of the prefabricated UHPC shell; an anchoring steel bar is reserved at the position of a prefabricated UHPC shell bottom plate pier stud and penetrates through the hole 13; and the cover beam reinforcement cage is placed in the prefabricated UHPC shell, and the reinforcement cage and the plate embedded part are connected into a whole and then common concrete is poured.
The bottom plate of the prefabricated UHPC shell at the pier stud position needs to be locally thickened, the hole reserved on the bottom plate of the prefabricated UHPC shell is matched with the position of a reserved steel bar 12 extending into the capping beam by the pier stud, and after the prefabricated UHPC shell is hoisted in place, a temporary safeguard measure is installed. And after all the concrete is ready, pouring the internal concrete layer by layer to complete the cast-in-place construction of the internal concrete of the bent cap.
The utility model discloses a combination bent cap can realize surpassing 30m traditional bent cap integral hoisting construction, only relies on the pier stud during the construction, sets up bracket platform 7, need not set up extra support, and is less to the current influence of both sides road, reduces the influence of bent cap construction to the current space under the bridge.
A steel bar connecting piece 9 is reserved at the top end of a side plate of the prefabricated UHPC shell, after a steel bar cage is hoisted in place, a short steel bar and the reserved steel bar connecting piece are connected into a whole by adopting an I-grade steel bar joint 10, a closed loop is formed by the top opening, the prefabricated UHPC shell and the steel bar cage are connected into a whole, and the integral synergistic effect of the prefabricated UHPC shell and the steel bar cage is increased.
By utilizing the bridge pier, when a bracket support platform is erected at the top of the bridge pier to serve as a construction platform and pour concrete, the bottom of the bent cap is temporarily supported. Before concrete in the capping beam is poured, a plurality of closed anchor ears 6 are arranged along the length direction of the capping beam, and the anchor ear at the pier top is restrained on a pier stud bracket platform, so that the lateral deformation of the prefabricated UHPC plate is restrained, and the prefabricated UHPC plate serves as a connecting function for pier beam consolidation. The hoops at other positions only restrict the lateral deformation of the prefabricated UHPC plate, and the line shape of the bent cap structure and the stability of the whole structure are ensured.
During construction:
the method comprises the following steps: and (4) prefabricating a UHPC shell in a factory, and integrally binding and manufacturing a reinforcement cage.
A reserved steel bar connecting piece is arranged at the top end of a side plate of the prefabricated UHPC plate, after a steel bar cage is hoisted in place, a short steel bar and the reserved steel bar connecting piece are connected into a whole by adopting an I-grade steel bar joint, a closed loop is formed by an opening at the top, the prefabricated UHPC plate and the steel bar cage are connected into a whole, and the integral synergistic effect of the prefabricated UHPC plate and the steel bar cage is increased. Binding a reinforcement cage inside the cover beam, and assembling the reinforcement cage and the UHPC shell into a whole in a prefabricated yard before delivery;
step two: and (4) transporting, hoisting and positioning the UHPC shell.
A corresponding stacking scheme is made for the UHPC shell according to the rigidity and the stress condition of the UHPC shell, and necessary supporting measures are considered.
Roughening the spliced surface of the bottom of the prefabricated UHPC shell and the pier stud, soaking the spliced surface in clean water, and paving a TGM60 mortar cushion layer with the thickness of 20 mm; derusting the reserved steel bars of the pier stud;
hoisting the UHPC shell by adopting hoisting tools such as a truck crane or a bridge girder erection machine according to the hoisting weight; when the UHPC shell is hoisted, the lifting should be stable and slow, and the collision should be strictly avoided.
Step three: and (5) temporarily solidifying the bent cap and the pier stud, and installing temporary measures.
By utilizing the bridge pier, when the bracket support is erected at the top of the bridge pier to serve as a temporary construction platform and pour concrete, the bottom of the bent cap is temporarily supported. After the UHPC shell is hoisted in place, the anchor ear and the pier stud are fixedly connected
Before concrete in the bent cap is poured, a plurality of closed hoops are arranged along the length direction of the bent cap, lateral deformation of the prefabricated UHPC plate is restrained, and the line shape of the bent cap structure and the stability of the whole structure are guaranteed.
Step four: and pouring internal concrete.
And (4) pouring concrete in the bent cap in a layered mode, removing the temporary measures after the post-poured concrete reaches the strength, and tensioning the bent cap to achieve prestress, so that the construction of the bent cap is completed.
The content of the present invention is not limited to the examples, and any equivalent transformation adopted by the technical solution of the present invention is covered by the claims of the present invention by those skilled in the art through reading the present invention.

Claims (7)

1. The utility model provides a half prefabricated UHPC-NC combination bent cap joint construction which characterized in that:
the structure comprises a prefabricated UHPC shell (1), a pier stud (2) and a pier stud bracket support platform (7);
the prefabricated UHPC shell (1) comprises a bottom plate, side plates at the front side and the rear side and end plates at the left end and the right end, and forms a shell-shaped structure with an open top;
the prefabricated UHPC shell (1) is arranged on a pier stud bracket supporting platform (7) at the top of the pier stud (2), pier stud reserved steel bars (12) at the top of the pier stud (2) are upwards inserted into the prefabricated UHPC shell (1), and concrete is poured into the prefabricated UHPC shell (1) to be connected into a whole.
2. The connection structure of the semi-prefabricated UHPC-NC combined cover beam as claimed in claim 1, characterized in that:
u-shaped transverse stiffening ribs (5) are arranged in the prefabricated UHPC shell (1) at intervals and are welded on a bottom plate and side plates of the prefabricated UHPC shell (1).
3. A semi-fabricated UHPC-NC composite capping beam joint construction according to claim 2, wherein:
closed anchor ears (6) are arranged outside the prefabricated UHPC shell (1) at intervals, and the closed anchor ears (6) at the pier tops of the pier columns (2) are restrained on a pier column bracket platform (7).
4. A semi-fabricated UHPC-NC composite capping beam joint construction according to claim 3, wherein:
be provided with inside steel reinforcement cage (3) in prefabricated UHPC shell (1), prefabricated UHPC shell (1) top is provided with UHPC shell embedded steel bar joint (9), and I grade steel bar attach fitting (10) are passed through at inside steel reinforcement cage (3) top and are connected to on UHPC shell embedded steel bar joint (9).
5. A semi-prefabricated UHPC-NC combined capping beam connection structure according to claim 4, characterized in that:
an embedded anchor backing plate at the end part of the shell and a prestressed pore channel (11) are arranged on an end plate of the prefabricated UHPC shell (1), prestressed steel bars are arranged in the prefabricated UHPC shell (1), and two ends of the prestressed steel bars are anchored on the end plate of the prefabricated UHPC shell (1).
6. A semi-prefabricated UHPC-NC combined capping beam connection structure according to claim 5, characterized in that:
the bottom plate of the prefabricated UHPC shell (1) is thickened at the position of the pier stud (2), a reserved hole (13) of the bottom plate of the UHPC shell is formed, and the reserved steel bar (12) of the pier stud is inserted into the prefabricated UHPC shell (1) through the reserved hole (13) of the bottom plate of the UHPC shell.
7. The connection structure of the semi-prefabricated UHPC-NC combined cover beam as claimed in claim 6, characterized in that:
a prefabricated UHPC shell pre-embedded corrugated pipe (8) is arranged in a side plate of the prefabricated UHPC shell (1).
CN202121408192.1U 2021-06-24 2021-06-24 Semi-prefabricated UHPC-NC combination bent cap joint construction Active CN217104675U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121408192.1U CN217104675U (en) 2021-06-24 2021-06-24 Semi-prefabricated UHPC-NC combination bent cap joint construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121408192.1U CN217104675U (en) 2021-06-24 2021-06-24 Semi-prefabricated UHPC-NC combination bent cap joint construction

Publications (1)

Publication Number Publication Date
CN217104675U true CN217104675U (en) 2022-08-02

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CN (1) CN217104675U (en)

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