阅读说明：本技术 一种钢管混凝土长轨枕及其施工方法 (Steel pipe concrete long sleeper and construction method thereof ) 是由 孙立 王森荣 李启航 宋文祥 张育红 丁正全 李秋义 杨艳丽 朱彬 张世杰 孙嘉 于 2019-12-11 设计创作，主要内容包括：本发明公开了一种钢管混凝土长轨枕,其特征在于,为整体预制件,包括多个钢管混凝土预制构件、门型钢筋、横向钢筋及后浇混凝土；横向钢筋固定在门型钢筋的两竖缘,两个钢管混凝土预制构件固定在横向钢筋与门型钢筋的上部围成的空间两端,组成钢管混凝土-钢筋框架笼；整个长度的钢管混凝土预制构件、整个横向钢筋、门型钢筋的上部均预制在后浇混凝土中,门型钢筋的U形下部露出后浇混凝土。本专利将成型的钢管混凝土构件预埋浇筑混凝土,形成长条形钢管混凝土结构,钢管混凝土结构的承载力高于相应的钢管承载力和混凝土承载力之和。钢管和混凝土之间的相互作用使钢管内部混凝土的破坏由脆性破坏转变为塑性破坏,构件的延性性能明显改善。(The invention discloses a long concrete filled steel tube sleeper which is characterized by being an integral prefabricated part and comprising a plurality of concrete filled steel tube prefabricated parts, door-shaped reinforcing steel bars, transverse reinforcing steel bars and post-cast concrete; the transverse steel bars are fixed at two vertical edges of the door-shaped steel bars, and the two steel pipe concrete prefabricated components are fixed at two ends of a space enclosed by the transverse steel bars and the upper parts of the door-shaped steel bars to form a steel pipe concrete-steel bar framework cage; the upper parts of the steel pipe concrete prefabricated part with the whole length, the whole transverse steel bar and the door-shaped steel bar are all prefabricated in post-cast concrete, and the U-shaped lower part of the door-shaped steel bar is exposed out of the post-cast concrete. This patent forms the pre-buried concreting of shaped steel pipe concrete component, forms rectangular shape steel pipe concrete structure, and steel pipe concrete structure's bearing capacity is higher than corresponding steel pipe bearing capacity and concrete bearing capacity's sum. The interaction between the steel pipe and the concrete changes the damage of the concrete in the steel pipe from brittle damage to plastic damage, and the ductility performance of the member is obviously improved.)

1. A long concrete filled steel tube sleeper is characterized by being an integral prefabricated part and comprising a plurality of concrete filled steel tube prefabricated parts (1), door-shaped reinforcing steel bars (2), transverse reinforcing steel bars (3) and post-cast concrete (4);

the concrete-filled steel tube prefabricated part (1) is a prefabricated part formed by filling concrete into a hollow steel tube;

a plurality of door-shaped reinforcing steel bars (2) are arranged along the length direction of the steel pipe concrete prefabricated part (1);

the transverse steel bars (3) are fixed at two vertical edges of the door-shaped steel bars (2), and the two steel pipe concrete prefabricated components (1) are fixed at two ends of a space enclosed by the transverse steel bars (3) and the upper parts of the door-shaped steel bars (2) to form a steel pipe concrete-steel bar framework cage;

the upper parts of the whole length of the steel pipe concrete prefabricated part (1), the whole transverse steel bar (3) and the door-shaped steel bar (2) are all prefabricated in the post-cast concrete (4), and the U-shaped lower part of the door-shaped steel bar (2) is exposed out of the post-cast concrete (4).

2. A long sleeper of steel pipe concrete as defined in claim 1, wherein:

the concrete-filled steel tube prefabricated part (1) is a prefabricated part formed by filling a self-compacting micro-expansion concrete material into a hollow steel tube and maintaining the hollow steel tube.

3. A long sleeper of steel pipe concrete as defined in claim 1, wherein:

the door-shaped reinforcing steel bars (2) are provided with lap joint parts at two upper edges.

4. A long sleeper of steel pipe concrete as defined in claim 1, wherein:

and U-shaped bent parts are arranged at two ends of the transverse steel bar (3) and are used for being fixedly connected with two vertical edges of the door-shaped steel bar (2).

5. A long sleeper of steel pipe concrete as defined in claim 1, wherein:

the post-cast concrete (4) comprises sleeper areas at two ends and a middle area; the sleeper area is provided with a plurality of embedded sleeves (5).

6. A long sleeper of steel pipe concrete as defined in claim 5, wherein:

the middle area is flush with the surfaces of the sleeper areas at the two ends.

7. A long sleeper of steel pipe concrete as defined in claim 5, wherein:

the middle area is concave relative to the pillow areas at the two ends.

8. A long sleeper of steel pipe concrete as defined in claim 5, wherein:

the door-shaped reinforcing steel bars (2) are arranged in the middle area at equal intervals or unequal intervals.

9. A long sleeper of steel pipe concrete as defined in claim 1, wherein:

the long concrete filled steel tube sleeper is a sleeper in a turnout area.

10. A method of constructing a long concrete filled steel tube sleeper as claimed in any one of claims 1 to 9, which includes the steps of:

s1, filling concrete into the hollow steel tubes, curing and forming, and then demolding to prepare a plurality of steel tube concrete prefabricated parts (1);

s2, manufacturing a plurality of door-shaped steel bars (2) with preset sizes and a plurality of transverse steel bars (3) with preset sizes; sequentially penetrating the portal steel bars (2) through the steel pipe concrete prefabricated part (1), fixing the transverse steel bars (3) to the portal steel bars (2) at the lower part of the steel pipe concrete prefabricated part (1), and welding or plate-binding a plurality of formed steel pipe concrete prefabricated parts (1), the portal steel bars (2) and the transverse steel bars (3) to form a steel pipe concrete-steel bar framework cage;

s3, placing the steel pipe concrete-steel bar framework cage into a mould, pouring concrete, and vibrating to compact, so as to ensure that the bottom door-shaped steel bar framework is exposed out of the bottom of the sleeper by a preset length; the maintenance of the sleeper is carried out together with the mold, followed by demolding.

Technical Field

The invention belongs to the field of concrete sleepers, and particularly relates to a steel pipe concrete long sleeper and a construction method thereof.

Background

In a railway ballastless track system, there is a prefabricated sleeper, which is installed in a track bed or cast with concrete as a whole with the track bed for installing fasteners to further fix the upper rails and needs to maintain good connection performance with the track bed.

Chinese patent document CN105463948B discloses a concrete-filled steel tube sleeper suitable for ballastless tracks, which uses concrete-filled steel tube as a connecting component of a sleeper block, and compared with general combined steel bar truss connection, has stronger integrity and can effectively alleviate the deformation of the concrete sleeper in the processes of storage, transportation and the like; simultaneously through the integrated into one piece of steel pipe concrete and sleeper concrete piece, realize the shaping of steel pipe concrete promptly when pouring the sleeper concrete piece to design into to become by many hollow steel pipes with the steel pipe concrete, effectually increased the geometric shape position holding power of sleeper, reduced the reinforcing bar quantity, improved constructability, can be under construction at the scene directly, satisfy the requirement of sleeper bending resistance ability.

As shown in figure 1, the sleeper that current switch district adopted is mostly concrete prestressing force long sleeper, and the sleeper is inside to be adopted prestressed reinforcement, and the sleeper bottom need set up the truss reinforcing bar, and this technique is great with the steel volume, production facility and production procedure are comparatively complicated.

Disclosure of Invention

Aiming at least one of the defects or improvement requirements in the prior art, the invention provides a long concrete filled steel tube sleeper and a construction method thereof. The interaction between the steel pipe and the concrete changes the damage of the concrete in the steel pipe from brittle damage to plastic damage, and the ductility performance of the member is obviously improved.

To achieve the above objects, according to one aspect of the present invention, there is provided a long sleeper of steel pipe concrete, which is an integral prefabricated member including a plurality of steel pipe concrete prefabricated parts, door-shaped reinforcing bars, transverse reinforcing bars, and post-cast concrete;

the steel pipe concrete prefabricated part is a prefabricated part formed by filling concrete into a hollow steel pipe;

a plurality of door-shaped reinforcing steel bars are arranged along the length direction of the steel pipe concrete prefabricated part;

the transverse steel bars are fixed at two vertical edges of the door-shaped steel bars, and the two steel pipe concrete prefabricated components are fixed at two ends of a space enclosed by the transverse steel bars and the upper parts of the door-shaped steel bars to form a steel pipe concrete-steel bar framework cage;

the concrete-filled steel tube prefabricated part, the whole transverse steel bar and the upper part of the door-shaped steel bar are all prefabricated in the post-cast concrete, and the U-shaped lower part of the door-shaped steel bar is exposed out of the post-cast concrete.

Preferably, the concrete-filled steel tube prefabricated part is a prefabricated part formed by pouring a self-compacting micro-expansion concrete material into a hollow steel tube and curing.

Preferably, the door-shaped reinforcing bars each have an overlapping portion at both upper edges.

Preferably, both ends of the transverse reinforcing steel bar are provided with U-shaped bent parts which are used for being fixedly connected with the two vertical edges of the door-shaped reinforcing steel bar.

Preferably, the post-cast concrete comprises sleeper areas at two ends and a middle area; the sleeper area is provided with a plurality of embedded sleeves.

Preferably, the intermediate area is flush with the sleeper area surfaces at both ends.

Preferably, said intermediate zone is concave relative to said pillow zones at both ends.

Preferably, a plurality of the gate-shaped reinforcing bars are arranged at equal intervals or unequal intervals in the middle area.

Preferably, the long concrete filled steel tube sleeper is a railroad switch area sleeper.

The long sleeper of steel pipe concrete suitable for switch district includes inside pre-buried 2 or many steel pipe concrete prefabricated component, and the inside concrete material that adopts self-compaction micro-expansion of steel pipe concrete prefabricated component pours into in advance to the maintenance shaping.

And manufacturing the door-shaped reinforcing steel bars according to the designed size, wherein the overlapping parts of the door-shaped reinforcing steel bars are welded or subjected to plate binding as shown in figure 5, and the door-shaped reinforcing steel bars penetrate through the concrete filled steel tube member. And manufacturing transverse reinforcing steel bars according to the designed size, wherein the transverse reinforcing steel bars penetrate through the bottom of the concrete filled steel tube member to support the concrete filled steel tube member as shown in figure 6. The combination of the portal reinforcement and the transverse reinforcement secures the concrete filled steel tube member in an intermediate position, as shown in the cross-sectional view of fig. 3.

And welding or plate binding a plurality of manufactured and molded steel pipe concrete prefabricated components, door-shaped steel bars and transverse steel bars to form an integral reinforcement cage, putting the integral reinforcement cage into a prefabricated mold, adjusting the position, and arranging embedded sleeves at corresponding positions according to design. And pouring a concrete material, so that the steel pipe concrete prefabricated part is embedded into the concrete, the door-shaped steel bar is partially embedded into the concrete, and the concrete is partially exposed. And vibrating, compacting, curing and forming to form the concrete filled steel tube sleeper.

In order to achieve the above object, according to another aspect of the present invention, there is provided a method for constructing a long sleeper of steel pipe concrete, including the steps of:

s1, filling concrete into the hollow steel tube, curing and forming, and then demolding to prepare a plurality of steel tube concrete prefabricated components;

s2, manufacturing a plurality of door-shaped steel bars with preset sizes and a plurality of transverse steel bars with preset sizes; sequentially penetrating the portal steel bars through the steel pipe concrete prefabricated components, fixing the transverse steel bars to the portal steel bars at the lower parts of the steel pipe concrete prefabricated components, and welding or plate-binding the formed multiple steel pipe concrete prefabricated components, the portal steel bars and the transverse steel bars to form a steel pipe concrete-steel bar framework cage;

s3, placing the steel pipe concrete-steel bar framework cage into a mould, pouring concrete, and vibrating to compact, so as to ensure that the bottom door-shaped steel bar framework is exposed out of the bottom of the sleeper by a preset length; the maintenance of the sleeper is carried out together with the mold, followed by demolding.

The above-described preferred features may be combined with each other as long as they do not conflict with each other.

Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

1. according to the long concrete filled steel tube sleeper, concrete is embedded in the formed concrete filled steel tube component to form a long concrete filled steel tube structure, and the bearing capacity of the concrete filled steel tube structure is higher than the sum of the corresponding bearing capacity of the steel tube and the concrete. The interaction between the steel pipe and the concrete changes the damage of the concrete in the steel pipe from brittle damage to plastic damage, and the ductility performance of the member is obviously improved.

2. According to the long concrete-filled steel tube sleeper disclosed by the invention, the concrete-filled steel tube member is matched with the portal steel bar, and the portal steel bar extends out of the interior of the sleeper to the bottom of the sleeper, so that a hoop effect is formed on concrete in the sleeper, the bearing capacity of the sleeper is enhanced, and meanwhile, the connection performance between the sleeper and a lower concrete track bed is enhanced, so that the track bed is more stable.

3. The long concrete filled steel tube sleeper is simple and easy to implement, has low cost, and can be widely applied to urban areas, intercity, subway projects and high-speed railway projects.

Drawings

FIG. 1 is a prior art schematic;

FIG. 2 is a side schematic view of a long concrete filled steel tube tie according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a long concrete filled steel tube tie according to an embodiment of the present invention;

FIG. 4 is a schematic plan view of a long concrete filled steel tube tie according to an embodiment of the present invention;

FIG. 5 is a schematic representation of the door-shaped reinforcing bars of a long concrete filled steel tube sleeper according to an embodiment of the present invention;

fig. 6 is a schematic view of the transverse reinforcement of a long concrete filled steel tube sleeper according to an embodiment of the present invention.

The dimensions in the figure are in mm.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The present invention will be described in further detail with reference to specific embodiments.

As a preferred embodiment of the present invention, as shown in fig. 2 to 6, the present invention provides a long sleeper of concrete filled steel tube, which is an integral prefabricated member including a plurality of precast members 1 of concrete filled steel tube, portal reinforcements 2, transverse reinforcements 3, and post-cast concrete 4.

The concrete-filled steel tube prefabricated part 1 is a prefabricated part formed by filling concrete into a hollow steel tube. Preferably, the concrete filled steel tube prefabricated parts 1 are all prefabricated parts formed by pouring self-compacting micro-expansion concrete materials into hollow steel tubes and curing.

As shown in fig. 5, a plurality of gate-shaped reinforcing bars 2 are arranged along the length direction of the steel pipe concrete prefabricated part 1; preferably, the door-shaped reinforcing bars 2 each have a lap joint portion at both upper edges.

As shown in fig. 6, the transverse steel bars 3 are fixed at two vertical edges of the portal steel bars 2, and the two precast concrete filled steel tubes 1 are fixed at two ends of a space enclosed by the transverse steel bars 3 and the upper portions of the portal steel bars 2, so as to form a concrete filled steel tube-steel bar framework cage; preferably, both ends of the transverse steel bar 3 are provided with U-shaped bent portions for fixedly connecting with two vertical edges of the door-shaped steel bar 2.

The concrete filled steel tube prefabricated part 1, the transverse steel bars 3 and the door-shaped steel bars 2 are prefabricated in the post-cast concrete 4, and the post-cast concrete 4 is exposed out of the U-shaped lower parts of the door-shaped steel bars 2. Preferably, the post-cast concrete 4 comprises a sleeper area at both ends and a middle area; the sleeper area is provided with a plurality of pre-buried sleeves 5. Preferably, the intermediate region is flush with the sleeper region surfaces at both ends or the intermediate region is concave relative to the sleeper regions at both ends.

Preferably, a plurality of the door-shaped reinforcing steel bars 2 are arranged in the middle area at equal intervals or unequal intervals; the remaining arrangements and spacings are shown in figures 2 and 4.

Preferably, the long concrete filled steel tube sleeper is particularly suitable for a sleeper in a turnout area.

The construction method of the steel pipe concrete long sleeper comprises the following steps:

s1, filling 2 hollow steel tubes with the length of 2600mm and the outer diameter of 40mm with concrete, curing, forming, and then demolding to obtain a plurality of concrete-filled steel tube prefabricated parts 1;

s2, manufacturing a plurality of door-shaped steel bars 2 with the height of 138mm and the length of 210mm, and manufacturing a plurality of transverse steel bars 3 with the length of 220 mm; sequentially penetrating portal-shaped steel bars 2 through the steel pipe concrete prefabricated part 1 according to design sizes with different intervals of 80mm and 190mm and a mode shown by a cross sectional diagram, fixing transverse steel bars 3 on the portal-shaped steel bars 2 at the lower part of the steel pipe concrete prefabricated part 1, and welding or plate-binding a plurality of formed steel pipe concrete prefabricated parts 1, the portal-shaped steel bars 2 and the transverse steel bars 3 to form a steel pipe concrete-steel bar framework cage;

s3, placing the steel tube concrete-steel bar frame cage into a prefabricated steel die with the length of 2600mm, the width of 291mm and the height of 135mm, pouring concrete, and vibrating to be compact to ensure that the bottom door-shaped steel bar frame is exposed out of the bottom of the sleeper by 3-5 cm; the maintenance of the sleeper is carried out together with the mold, followed by demolding.

In summary, the present invention has the following outstanding advantages:

according to the long concrete filled steel tube sleeper, concrete is embedded in the formed concrete filled steel tube component to form a long concrete filled steel tube structure, and the bearing capacity of the concrete filled steel tube structure is higher than the sum of the corresponding bearing capacity of the steel tube and the concrete. The interaction between the steel pipe and the concrete changes the damage of the concrete in the steel pipe from brittle damage to plastic damage, and the ductility performance of the member is obviously improved.

According to the long concrete-filled steel tube sleeper disclosed by the invention, the concrete-filled steel tube member is matched with the portal steel bar, and the portal steel bar extends out of the interior of the sleeper to the bottom of the sleeper, so that a hoop effect is formed on concrete in the sleeper, the bearing capacity of the sleeper is enhanced, and meanwhile, the connection performance between the sleeper and a lower concrete track bed is enhanced, so that the track bed is more stable.

The long concrete filled steel tube sleeper is simple and easy to implement, has low cost, and can be widely applied to urban areas, intercity, subway projects and high-speed railway projects.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.