CN108797312A - A kind of bent cap structure and its construction method - Google Patents

Abstract

The present invention relates to the technical field of bridge engineering, in particular to a cover beam structure, characterized in that the cover beam structure includes a hollow structure and a solid structure, wherein the solid structure corresponds to the position of the bridge pier, and the hollow structure corresponds to the position of the adjacent bridge pier The position between them corresponds to the position of the cantilever arm of the cover beam. The external prestressed steel beam is stretched at the end of the cover beam, and the steel beam is perforated in the solid structure to realize the steering of the external prestressed steel beam; the cover beam structure The solid part of the bridge is connected with the pier to form a whole, and the solid structure is connected with the column of the pier to form a consolidation node. The cover beam structure of the present invention can greatly reduce the weight of the cover beam structure, save the amount of columns, caps and pile foundations, reduce the cost of the project, and can more widely apply the prefabricated assembly process to realize the standardization, factoryization and assembly of the cover beam structure. It can improve the level of bridge construction in our country, has good environmental benefits, social benefits and economic benefits, and is worthy of promotion and application.

Description

A cover beam structure and its construction method

technical field

The invention relates to the technical field of bridge engineering, in particular to a cover beam structure.

Background technique

At present, in the bridge construction in our country, there are generally two types of cap-beam structures:

(1) Ordinary concrete cap beam. Ordinary concrete is used and the internal prestress is set. When the cover beam structure is under a small force, the internal prestress can also be canceled and only ordinary steel bars are set. This type of cover beam generally adopts the cast-in-place process of brackets. With the implementation of the national "green building" development strategy, more and more prefabricated assembly processes are used for the construction of cover beam structures. However, this type of cover beam is heavy. Although it can be hollowed out inside the cover beam to reduce weight, due to the limitation of the layout space of the prestress in the body and the limitation of the performance of concrete materials, when the bridge width is large, the scale of the cover beam is large. However, the weight after weight reduction is still relatively large, which cannot meet the construction requirements. Due to the limitations of transportation equipment, hoisting equipment and hoisting space, it is very difficult to apply prefabricated assembly technology in urban construction-intensive areas.

(2) Steel structure cover beam. The main structure of the cover beam is made of steel. This type of cover beam is light in weight. It is constructed by prefabricated assembly technology. It is prefabricated in the factory and assembled on site, with a high degree of mechanization. However, the post-maintenance workload of this type of cap beam is huge, and the overall cost is high. Currently, it is only used in a small amount in some special locations.

With the continuous development of urban construction, there is an urgent need for a new type of cover beam structure, which can greatly reduce the weight of the cover beam structure, save the amount of columns, caps and pile foundations, and reduce the cost of the project. , can widely apply prefabricated assembly technology, meet the rapid construction requirements in urban building-intensive areas, bridge widths, etc., and facilitate post-maintenance.

Contents of the invention

In view of the above problems, the present invention proposes a cover beam structure, which can greatly reduce the weight of the cover beam, save the amount of columns, caps and pile foundations, reduce the cost of the project, can widely apply prefabricated assembly technology, and is convenient for later maintenance, further Improve the level of bridge construction in our country.

The realization of the present invention is accomplished by the following technical solutions: a cover beam structure, characterized in that the cover beam structure includes a hollow structure and a solid structure, wherein the solid structure corresponds to the position of the pier column, and the hollow structure corresponds to the adjacent The position between the columns of the pier and the cantilever position of the cover beam correspond to the position of the cantilever. The externally prestressed steel beam is stretched at the end of the cover beam, and the steel beam is perforated in the solid structure to realize the steering of the externally prestressed steel beam; the cover The solid part of the beam structure is connected with the pier column to form a whole, and the solid structure is connected with the pier column to form a consolidation node.

Further, the hollow structure is made of ultra-high-performance concrete; the solid structure is made of ultra-high-performance concrete or ordinary concrete.

Further, the solid structure can also be partially hollowed out.

Further, it is located outside the hollow structure of the cantilever of the cover beam, that is, the end of the cantilever is provided with a steel beam anchorage point, and the externally prestressed steel beam is anchored to the steel beam anchorage point outside the hollow structure of the cantilever of the cover beam, and the cover beam The ends are made of ultra-high performance concrete material.

Further, for the hollow structure and the solid structure, steel bars should be provided in the concrete material.

Further, the web of the hollow part of the cover beam structure is made of ultra-high performance concrete, the stirrup in the position of the web can be canceled, and a single vertical hook bar is set at the position of the web to fully reduce the web thickness.

Further, the wall thickness of the web, top plate and bottom plate of the hollow structure is 8cm-12cm, which can also be appropriately relaxed according to the actual situation.

Further, the construction of the cover beam structure can adopt the segmental prefabricated assembly process and the overall prefabricated assembly process.

Further, the hollow structural part of the cover beam can adopt single box single room, single box double room or single box multi room.

Another object of the present invention is to propose a construction method for the cap beam structure, which can greatly reduce the weight of the cap girder, save the amount of columns, caps and pile foundations, reduce the cost of the project, and can widely apply the prefabricated assembly process, and is convenient Post-maintenance will further improve the level of bridge construction in our country.

The realization of the present invention is accomplished by following technical scheme: a kind of construction method of cover beam structure, it is characterized in that this construction method comprises the following steps:

A. Pouring an integral cap beam structure in the prefabrication factory. The integral cap beam structure includes a solid structure and a hollow structure, wherein the position of the solid structure corresponds to the position of the pier column, and the position of the hollow structure corresponds to the position between the corresponding pier column and The position of the cantilever of the cover beam is corresponding, the steel beam is perforated in the solid structure, and the steel beam anchorage point is set outside the hollow structure of the cantilever of the cover beam;

B. After the prefabricated integral cover beam structure is maintained to the design strength, the external prestressed steel tendons are stretched, and the external prestressed steel tendons are stretched at the anchor point of the hollow structural steel tendons at the end of the cantilever, and the steel tendons in the solid structure are perforated It is used to realize the steering of externally prestressed steel beams;

C. Transport the prefabricated cover beam structure to the construction site as a whole, and use hoisting equipment to install the prefabricated integral cover beam structure on the pier that has been constructed;

D. Finally, at the position of the solid structure, connect the pier column and the cover beam structure as a whole.

Realization of the present invention can also be accomplished by following technical scheme: a kind of construction method of cover beam structure, it is characterized in that this construction method comprises the following steps:

A. Multiple cap beam segments are poured in the prefabrication factory. The cap beam segments include solid structures and hollow structures, where the position of the solid structure corresponds to the position of the pier columns, and the hollow structure corresponds to the position between the corresponding pier columns. Corresponding to the position of the cantilever arm of the cover beam, the steel beam perforation is set in the solid structure, and the steel beam anchorage point is set at the end of the cantilever arm;

B. After the prefabricated cover beam sections are cured to the design strength, the prefabricated cover beam sections are transported to the construction site in batches;

C. Use hoisting equipment and brackets to assemble the cover beam sections into an overall cover beam structure, install it on the pier that has been constructed, stretch the external prestressed steel beam, and tension it at the anchor point of the steel beam at the end of the cantilever Externally prestressed steel beams, the steel beams in the solid structure are perforated to realize the steering of externally prestressed steel beams;

D. Finally, at the position of the solid structure, connect the pier column and the cover beam structure as a whole.

Further, the hollow structure is made of ultra-high-performance concrete; the solid structure is made of ultra-high-performance concrete or ordinary concrete.

Further, the solid structure is connected with the pier column to form a consolidation node.

The cover beam structure of the present invention can greatly reduce the weight of the cover beam structure, save the consumption of columns, caps and pile foundations, reduce the engineering cost, and can more widely apply the prefabricated assembly process. The advantages of the present invention are:

①Compared with ordinary concrete cover beams, the weight of the cover beam can be greatly reduced, the amount of columns, caps and pile foundations can be saved, and the project cost can be reduced. The thickness of the prestressed steel beam is not controlled by the structure of the prestressed steel beam, and the ultra-high performance concrete material is used, so the thickness can be greatly reduced, and the minimum thickness is 8cm~12cm. The minimum plate thickness of the conventional hollow structure is controlled by the structure of the prestressed steel strands and the properties of the concrete material, and the control is not less than 20cm~25cm. Therefore, the present invention has a breakthrough in reducing the weight of the substructure cover beam, and can more widely apply the prefabrication assembly process to realize the standardization, factoryization and assembly of the cover beam structure;

② Compared with the steel structure cover beam, it is convenient for later maintenance and has good economy;

③It is suitable for the overall prefabrication of components or segmental prefabrication, transportation and hoisting, and can widely apply prefabricated assembly technology.

Description of drawings

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. in:

Fig. 1 is the elevation schematic diagram of novel cover beam structure among the present invention;

Fig. 2 is the A-A sectional view of Fig. 1 among the present invention;

Fig. 3 is the B-B sectional view of Fig. 1 among the present invention;

In the figures, the same parts are given the same reference numerals.

Detailed ways

Below in conjunction with accompanying drawing, by describing a preferred specific embodiment in detail, the feature of the present invention is further elaborated, so that the understanding of those skilled in the art:

As shown in Figures 1-3, the marks in the figures are: hollow structure 1, solid structure 2, and external prestressed steel beam 3.

The hollow structure 1 and solid structure 2 in the new cover beam structure are poured into an integral cover beam structure in the prefabrication factory. The hollow structure 1 is made of ultra-high performance concrete, and the solid structure 2 is made of ordinary concrete. After the overall cover beam structure is maintained to the design strength, the external prestressed steel beam 3 is stretched. After the 3 tensioning and anchoring of the external prestressed steel beams are completed, the prefabricated cover beam structure is transported to the construction site as a whole through the transportation equipment, and the prefabricated cover beam structure is installed on the pier that has been constructed using the hoisting equipment, and finally the solid structure 2 position , connecting the pier and the cap beam structure as a whole. When the stress of the cover beam is small, the external prestressed steel beam 3 can be canceled.

As shown in the figure, according to a specific embodiment of the present invention, the cover beam structure is sequentially connected by the first hollow structure, the first solid structure, the second hollow structure, the second solid structure and the third hollow structure to form an integral cover The beam structure, wherein the first hollow structure and the third hollow structure are arranged symmetrically, the first solid structure and the second solid structure are arranged symmetrically, and the outer sides of the first hollow structure and the third hollow structure are provided with steel beam anchorage points, which are used for anchoring. For the prestressed steel beam, steel beam perforations are provided in the first solid structure and the second solid structure, which are used for contacting and turning of the prestressed steel beam outside the body. The first hollow structure, the second hollow structure and the third hollow structure are all box structures in the form of a single box with double chambers.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as limiting the present invention, and the protection scope of the present invention should be defined by the appended claims.

Claims (9)

1. a kind of bent cap structure, it is characterised in that the bent cap structure includes hollow-core construction and solid construction, wherein described solid Structure is corresponding with the position of pier column, and then the position between corresponding pier column and bent cap choose arm to hollow-core construction Position is corresponding, and the perforation of steel beam is set in bent cap end tensioning external prestressing steel beam, solid construction, is answered in advance in vitro to realize Power steel beam turns to；The solid section of the bent cap structure connect to form entirety with pier column, and solid construction connects with pier column It connects to form consolidated node.

2. bent cap structure according to claim 1, it is characterised in that the hollow-core construction uses ultra-high performance concrete Material；The solid construction uses ultra-high performance concrete material or common concrete material.

3. bent cap structure according to claim 1, it is characterised in that be located on the outside of the hollow-core construction of beam-ends and be equipped with steel beam anchor Solid point, the external prestressing steel beam are anchored in the steel beam anchor point of bent cap end, and bent cap end uses very-high performance coagulation Soil material.

4. bent cap structure according to claim 1, it is characterised in that the hollow-core construction and solid construction, in its coagulation Reinforcing bar should be set in soil material.

5. bent cap structure according to claim 1, it is characterised in that the web position setting of the hollow-core construction is single It is vertical to hook muscle, fully reduce web thickness.

6. bent cap structure according to claim 1, it is characterised in that the web of the hollow-core construction, the wall of top plate and bottom plate Thickness is 8cm ~ 12cm, also can suitably be relaxed according to actual conditions.

7. bent cap structure according to claim 1, it is characterised in that single box single chamber, single case may be used in the hollow-core construction Dual chamber and single-box multi-cell.

8. a kind of construction method of bent cap structure, it is characterised in that the construction method includes the following steps：

A, integral bent cap structure is poured in pre-fabricated factory, the integral cap girder construction includes solid construction and hollow-core construction, Wherein solid construction position is corresponding with pier column position, hollow-core construction then the position between corresponding pier column and Bent cap to choose arm position corresponding, the perforation of steel beam is set in solid construction, arm end is chosen and is equipped with steel beam anchor point；

B, prefabricated integral cap girder construction is conserved to design strength, tensioning external prestressing steel beam, positioned at choosing arm end steel beam Tensioning external prestressing steel beam at anchor point, the steel beam in solid construction perforate to realize that external prestressing steel beam turns to；

C, by preform lid girder construction whole Transporting to construction site, prefabricated integral cap girder construction is installed to using hanging device Through constructing on the bridge pier finished；

D, finally in solid construction position, pier column and bent cap structure are connected as entirety.

9. a kind of construction method of bent cap structure, it is characterised in that the construction method includes the following steps：

A, it is poured in pre-fabricated factory and builds up multiple bent cap segments, the bent cap segment includes solid construction and hollow-core construction, wherein Solid construction position is corresponding with pier column position, the hollow-core construction then position between corresponding pier column and bent cap To choose arm position corresponding, the perforation of steel beam is set in solid construction, arm end is chosen and is equipped with steel beam anchor point；

B, preform lid girder segment is conserved to design strength, by preform lid girder segment transported batchwise to construction site；

C, bent cap segment is assembled by integral cap girder construction, installation to the bridge pier finished of having constructed using hanging device and holder On, tensioning external prestressing steel beam, in tensioning external prestressing steel beam, solid construction at the steel beam anchor point for choosing arm end Interior steel beam perforates to realize that external prestressing steel beam turns to；

D, finally in solid construction position, pier column and bent cap structure are connected as entirety.