CN221608585U - Combined T-beam - Google Patents

Abstract

The application relates to a composite T-beam, comprising: the middle section comprises connecting steel bars and first concrete poured on the connecting steel bars, and extends along the longitudinal bridge; the both ends of middle part section are connected with the tip section respectively, and the tip section is used for setting up in bridge support respectively to the both ends of connecting reinforcement, and the tip section has pour the second concrete on connecting reinforcement, and the intensity of second concrete is greater than the intensity of first concrete, and the toughness of second concrete is higher than the toughness of first concrete, and the width of middle part section along the transverse bridge to is the same with the width of tip section along the transverse bridge to. Through pouring first concrete in the middle section, pouring second concrete in the end section, and the intensity of second concrete is greater than first concrete, makes the width of end section middle section along the transverse bridge to also can satisfy the shear resistance of combination T roof beam when the same, solves among the relevant technique because the inside reinforcing bar of T roof beam is intensive, the difficult technical problem of pouring quality difficulty assurance is poured to the difficult vibration when concrete pouring.

Description

Combined T-beam

Technical Field

The application relates to the field of bridge design and construction of combined structures, in particular to a combined T-beam.

Background

The assembled prestressed concrete T-beam is an important branch of the assembled bridge, the T-beam is often constructed in a mode of prefabrication storage in a factory and hoisting in place on site, the T-beam is high in production efficiency, high in construction speed and low in manufacturing cost, and the T-beam is widely applied to bridges of 20-40 m.

In the related art, two ends of an assembled prestressed concrete T beam are usually respectively arranged on two adjacent pier supports arranged at intervals along a longitudinal bridge, so that the shearing capacity of the two ends of the T beam is met, the two ends of the T beam are usually widened along a transverse bridge direction, a gradual change section is formed between the end part and the middle part of the T beam, but the arrangement mode leads to complex steel bar structures in the T beam, particularly a prestressed steel bar anchoring area, the steel bars are dense, vibration is difficult during concrete pouring, and pouring quality is difficult to ensure.

Disclosure of Invention

The application provides a combined T-beam, which can solve the technical problems that in the related art, two ends of the T-beam are widened along the transverse bridge direction, and a gradual change section is formed between the end part and the middle part of the T-beam, so that the structure of steel bars in the T-beam is complex, especially a prestressed steel bar anchoring area is dense in steel bars, vibration is difficult in concrete pouring, and pouring quality is difficult to guarantee.

In a first aspect, embodiments of the present application provide a composite T-beam, comprising: the middle section comprises connecting steel bars and first concrete poured on the connecting steel bars, and the middle section extends along the longitudinal bridge direction; the two ends of the middle section are respectively connected with the end sections, the two ends of the connecting steel bars extend into the end sections respectively, the end sections are used for being erected on bridge supports, the end sections are cast with second concrete on the connecting steel bars, the strength of the second concrete is greater than that of the first concrete, and the width of the middle section along the transverse bridge direction is the same as that of the end sections along the transverse bridge direction.

With reference to the first aspect, in one embodiment, the middle section includes a first layer and a second layer disposed up and down, the second layer is laid on the first layer, and the second layer is poured with a second concrete.

With reference to the first aspect, in one embodiment, the second layer is embedded with a longitudinal steel bar, and two ends of the longitudinal steel bar extend into the end sections located at two ends of the middle section respectively.

In combination with the first aspect, in one implementation manner, the first layer is pre-embedded with inverted U-shaped steel bars, and a portion of the inverted U-shaped steel bars extends into the second layer, so that the inverted U-shaped steel bars are enclosed outside at least a portion of the longitudinal steel bars and the connecting steel bars.

In combination with the first aspect, in one embodiment, the inverted U-shaped steel bars are pre-buried in a plurality of, the inverted U-shaped steel bars are distributed at intervals along the longitudinal bridge direction, and the interval between two adjacent inverted U-shaped steel bars is 200-400 mm.

With reference to the first aspect, in one embodiment, the length of the second layer along the longitudinal bridge is greater than the length of the first layer along the longitudinal bridge, and both ends of the second layer along the longitudinal bridge extend into the end sections.

With reference to the first aspect, in one embodiment, the second concrete poured by the end section is filled with coarse aggregate.

With reference to the first aspect, in one embodiment, the coarse aggregate comprises basalt crushed stone.

With reference to the first aspect, in one embodiment, the connecting rebar comprises a first rebar extending along the end section of one end to the end section of the other end; the connecting steel bars further comprise prestressed steel bars, and two ends of each prestressed steel bar extend out of the end sections of the two ends of the middle section respectively.

With reference to the first aspect, in one embodiment, the middle section includes a first upper flange, a first web, and a first bottom plate, the first web connects the first upper flange and the first bottom plate, and the prestressed reinforcement is located in the first bottom plate; the end section comprises a second upper flange, a second web and a second bottom plate, wherein the second web connects the second upper flange and the second bottom plate, and the prestressed reinforcement extends from the inside of the first bottom plate of the middle section to the inside of the second web of the end section.

With reference to the first aspect, in one embodiment, the length of the end section along the longitudinal bridge direction is 0.05 to 0.1 times the bridge direction length of the combination T Liang Yanzong.

The technical scheme provided by the embodiment of the application has the beneficial effects that:

Through pouring first concrete in the middle section, pour second concrete in the tip section, and intensity and toughness of second concrete are all greater than first concrete, can make the tip section along the width of horizontal bridge to and the middle section along the width of horizontal bridge to also can satisfy the shear resistance of combination T roof beam under the same circumstances, thereby can reduce the quantity of locating the connecting reinforcement in tip section and the middle section, thereby can be convenient for vibrate first concrete and the second concrete in tip section and the middle section, the technical problem that because the inside reinforcing bar structure of T roof beam is complicated in the correlation technique, the vibration is difficult when concreting, pouring quality is difficult to guarantee is solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a structure of an end section and a second layer of a second concrete filled structure according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a first layer and a second layer according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of a middle section provided in an embodiment of the present application;

Fig. 4 is a schematic cross-sectional view of an end section provided in an embodiment of the present application.

In the figure:

1. A middle section; 111. a first layer; 112. a second layer; 1121. longitudinal steel bars; 1122. inverted U-shaped reinforcing steel bars; 12. a first upper flange; 13. a first web; 14. a first base plate;

21. a first reinforcing bar; 22. prestress steel bars;

3. An end section; 32. a second upper flange; 33. a second web; 34. and a second bottom plate.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The embodiment of the application provides a combined T-beam, which can solve the technical problems that in the related art, two ends of the T-beam are widened along the transverse bridge direction, and a gradual change section is formed between the end part and the middle part of the T-beam, so that the structure of steel bars in the T-beam is complex, especially a prestressed steel bar anchoring area is dense in steel bars, vibration is difficult in concrete pouring, and pouring quality is difficult to guarantee.

Referring to fig. 1, a composite T-beam according to an embodiment of the present application may include: the middle section 1, wherein the middle section 1 is poured with connecting steel bars and first concrete poured on the connecting steel bars, the first concrete can be ordinary concrete (NC concrete) or high-performance concrete and the like, the connecting steel bars can be provided with a plurality of connecting steel bars, the connecting steel bars are buried in the middle section 1 along the longitudinal bridge direction, and the middle section 1 extends along the longitudinal bridge direction; the two ends of the middle section 1 are respectively connected with the end sections 3, the two ends of the connecting reinforcing steel bar extend into the end sections 3, the end sections 3 are used for being erected on bridge supports, the end sections 3 are cast on the connecting reinforcing steel bars, in this embodiment, the second concrete is preferably ultra-high performance concrete (UHPC), of course, other high strength concrete can be selected, so that the strength of the second concrete is greater than that of the first concrete, the toughness of the second concrete is higher than that of the first concrete, the width of the middle section 1 along the transverse bridge direction is the same as that of the end sections 3 along the transverse bridge direction, the ultra-high performance concrete has higher toughness than that of the common concrete, and can provide stronger compression and tensile effects, thereby enabling the resistance of the middle section 1 along the transverse bridge direction to meet the overall shear force requirement of the end section 3 when the combined shear beam is built under the condition that the width of the middle section 1 along the transverse bridge direction is the same as that of the end section 3 along the transverse bridge direction.

According to the embodiment of the application, the first concrete is poured into the middle section 1, the second concrete is poured into the end section 3, the strength and toughness of the second concrete are higher than those of the first concrete, namely, the second concrete can have better compression resistance and tensile resistance, so that the width of the end section 3 along the transverse direction of the transverse bridge is the same as that of the middle section 1, the shearing resistance of the combined T beam can be met under the condition that the width of the end section 3 along the transverse direction of the transverse bridge is the same, the end section does not need to be widened, the number of connecting steel bars arranged in the end section 3 and the middle section 1 can be reduced, the first concrete and the second concrete in the end section 3 and the middle section 1 can be conveniently vibrated, the first concrete and the second concrete are more compact, the strength of the middle section 1 and the end section 3 can be enhanced, the width of the end section 3 along the transverse direction of the transverse bridge is the same as that of the middle section 1, preferably, the width of the end section 3 along the transverse bridge is consistent with the transverse direction of the middle section 1 can be simplified, the construction template of the combined T beam can be built, the width of the end section 3 along the transverse bridge is smaller than that of the connecting steel bars arranged in the transverse bridge, the relevant technology can be assembled with the T beam, the quantity of the T beam can be reduced, and the relevant quality of the reinforced concrete can be difficult to be guaranteed because the concrete is more densely poured in the technology is compared with the concrete, and the relevant quality of the concrete pouring technology is difficult to be solved.

In some optional embodiments, the middle section 1 includes a first layer 111 and a second layer 112 that are disposed up and down, the second layer 112 is laid on the first layer 111, and the second layer 112 is poured with a second concrete, in this embodiment, an ultra-high performance concrete with high strength and high toughness is laid above the first layer 111 to form the second layer 112, so as to improve the overall tensile strength of the middle section 1, effectively enhance the overall safety of the combined T beam, and at this time, the connecting steel bars are located in the first layer 111, and the first layer 111 may be poured with a first concrete, that is, a normal concrete may be poured with a C50-C60 concrete, and the second layer 112 that is poured with an ultra-high performance concrete is disposed in the middle section 1, so that the high crack resistance of the ultra-high performance concrete may be exerted, and at the same time, the second layer 112 may also solve the problem of uneven arch camber of the prestressed T beam, and reduce or even omit the use amount of leveling layer in the bridge site.

In some alternative embodiments, the second layer 112 is embedded with longitudinal steel bars 1121, two ends of the longitudinal steel bars 1121 extend into the end sections 3 located at two ends of the middle section 1, the second layer 112 and the end sections 3 may be connected by the longitudinal steel bars 1121, so that the second layer 112 may have a better connection relationship with the end sections 3 even in the case of post casting, according to the performance (such as strain hardening property, compressive strength, flexural strength, ultimate tensile strength, elastic modulus and the like) required by calculating the second layer 112 of the middle section 1, the second layer 112 may be set to have different thicknesses along the vertical direction, when the thickness of the second layer 112 does not exceed 30mm, the second layer 112 may not be set with steel bars, after exceeding 30mm, the longitudinal steel bars 1121 may be set, at this time, the thickness of the net protective layer may be 10-25 mm, preferably, and the thickness of the second layer 112 is between 20-60 mm. In this embodiment, the second layer 112 has strain hardening characteristics, the steel fiber content is not less than 2.5%, the compressive strength is not less than 120MPa, the flexural strength is not less than 22MPa, the ultimate tensile strength is not less than 10MPa, the elastic modulus is not less than 40MPa, and it has good workability, durability and volume stability, and the total shrinkage strain is not more than 200 με. It should be appreciated that the longitudinal rebar 1121 may extend only partially into the end section 3, where a portion may refer to a shorter length of the longitudinal rebar 1121 extending into the end section 3, and that the longitudinal rebar 1121 may extend into a longer length of the end section 3, saving some construction material; longitudinal rebar 1121 may also be in contact with the side wall distal from middle section 1 in end section 3. Furthermore, a plurality of longitudinal bars 1121 may be provided, in this embodiment, two ends of each longitudinal bar 1121 extend into the end sections 3 at two ends of the middle section 1, respectively, where the length of the longitudinal bar 1121 along the extension direction of the composite T-beam is longer, and in some other embodiments, the length of the longitudinal bar 1121 may be shorter, where one end of the longitudinal bar 1121 extends into the end section 3 and the other end extends a smaller distance into the middle section 1, and it should be understood that a plurality of such longitudinal bars 1121 are provided in the end sections 3 at two ends. The second layer 112 may be cast before tensioning the tendon when prefabricated in a factory, and the top end of the first layer 111 may be roughened before casting.

Referring to fig. 2, in some alternative embodiments, the first layer 111 is pre-embedded with an inverted U-shaped steel 1122, and a portion of the inverted U-shaped steel 1122 extends into the second layer 112, so that the inverted U-shaped steel 1122 is enclosed outside at least a portion of the longitudinal steel 1122 and the connecting steel, in this embodiment, a plurality of longitudinal steel 1121 are disposed parallel to each other, the inverted U-shaped steel 1122 has two vertical rods and a cross rod, the cross rod is located at the end portions of the two vertical rods, when the inverted U-shaped steel 1122 is pre-embedded into the first layer 111, a quadrilateral structure is formed between the cross rod and portions of the two vertical rods and the top surface of the first layer 111, and a portion of the longitudinal steel 1121 extends into the quadrilateral structure, or all of the longitudinal steel 1121 extends into the quadrilateral structure, by pre-embedding the inverted U-shaped steel 1122 in the first layer 111, and the longitudinal steel 1121 extends into the inverted U-shaped steel 1122, the connection degree between the first layer 111 and the second layer 112 can be reinforced, and the combined beam can be further compacted to have a diameter of the cross rod 1121 to be equal to the diameter of the cross rod 1121, and the top end portion of the cross rod can be equal to the diameter of the cross rod 1121 to the cross rod in the whole structure of the cross rod or the cross rod is 400 mm. Preferably, an inclined rod may be welded at one end of the vertical rod embedded into the first layer 111, an acute angle is formed between the inclined rod and the vertical rod, and a part of the connecting steel bars embedded into the first layer 111 may also extend into the angle, in this embodiment, the connecting steel bars extending into the angle are first steel bars 21. Preferably, a plurality of inverted U-shaped steel bars 1122 are embedded, a plurality of inverted U-shaped steel bars 1122 are distributed along the longitudinal bridge at intervals, and the interval between every two adjacent inverted U-shaped steel bars 1122 is 200-400 mm, so that the plurality of inverted U-shaped steel bars 1122 are arranged at intervals, thereby meeting the performance of the inverted U-shaped steel bars and saving part of materials. The ultra-high performance concrete laid on the second layer 112 can also play a role in water resistance and protection, and can effectively improve the durability of the beam body.

In some alternative embodiments, the length of the second layer 112 along the longitudinal bridge is greater than the length of the first layer 111 along the longitudinal bridge, and the two ends of the second layer 112 along the longitudinal bridge extend into the end section 3, in this embodiment, the extending of the end of the second layer 112 along the longitudinal bridge into the end section 3 means that the second layer 112 covers a part of the seam between the end section 3 and the top surface of the middle section 1, so that the ultra-high performance concrete poured on the second layer 112 can protect the seam therebetween, thereby improving the durability of the seam between the end section 3 and the middle section 1.

In some optional embodiments, the second concrete poured by the end section 3 is filled with coarse aggregate, the ultra-high performance concrete has higher cost, and part of coarse aggregate can be filled into the ultra-high performance concrete on the premise of meeting the shearing resistance of the end section 3 so as to save production cost. Preferably, the coarse aggregate comprises basalt crushed stone, the diameter of the basalt crushed stone can be between 5 and 10mm, the doping amount of steel fibers in the ultra-high performance concrete is not less than 1.0%, the compressive strength is not less than 80MPa, the flexural strength is not less than 15MPa, the ultimate tensile strength is not less than 6MPa and the elastic modulus is not less than 40MPa, so that the ultra-high performance concrete has better working performance, durability and volume stability, and the total shrinkage strain is not more than 200 mu epsilon.

In some alternative embodiments, the connecting bars include a first bar 21, the first bar 21 extends along the end section 3 at one end to the end section 3 at the other end, that is, the first bar 21 is inserted into the combined T-beam, and two ends of the first bar 21 may be adjacent to sidewalls where the end sections 3 at two ends of the middle section 1 are far away from each other; the connecting steel bars further comprise prestressed steel bars 22, in the embodiment, the conventional prestressed steel strands are adopted as the prestressed steel bars 22, two ends of each prestressed steel bar 22 respectively extend out of the end sections 3 at two ends of the middle section 1, a plurality of prestressed steel bars 22 are fixed into a plurality of wire harnesses in the combined T-shaped beam through corrugated pipes, and the two ends of each prestressed steel bar 22 respectively extend out of the end sections 3 at two ends so as to facilitate grouting into the corrugated pipes in later stages.

Referring to fig. 3 and 4, in some alternative embodiments, the middle section 1 includes a first top flange 12, a first web 13, and a first bottom plate 14, the first web 13 connects the first top flange 12 and the first bottom plate 14, and the prestressed reinforcement 22 is located in the first bottom plate 14; the end section 3 includes a second upper flange 32, a second web 33 and a second bottom plate 34, the second web 33 connects the second upper flange 32 and the second bottom plate 34, the prestressed reinforcement 22 extends from the first bottom plate 14 of the middle section 1 to the second web 33 of the end section 3, that is, in this embodiment, the prestressed reinforcement 22 has different heights in the vertical direction between the end section 3 and the middle section 1, the prestressed reinforcement 22 may have better prestress in the first bottom plate 14 in the middle section 1, and the prestressed reinforcement 22 may have larger anchoring space when the prestressed reinforcement 22 is anchored at two ends of the composite T-beam in the second web 33 in the end section 3, so that the operation is convenient, and the prestressed reinforcement 22 at the end has a certain bending radian and may have better shearing resistance. In some other embodiments, the prestressed reinforcement 22 may also be provided in the second floor 34 in the end section 3, when the second floor 34 has a large operating space.

In some alternative embodiments, the length of the end section 3 along the longitudinal bridge is 0.05-0.1 times of the length of the combined T Liang Yanzong bridge, and the length can enable the end section 3 to meet the shearing resistance requirement of the combined T beam.

Because the assembled prestressed concrete T beam is easy to have the defects of sinking, crushing and the like of the concrete under the anchor under the action of local high-pressure stress in the tensioning prestressing process, the structural safety and the engineering progress can be seriously influenced, and the second layers 112 of the end section 3 and the middle section 1 are made of high-strength and high-toughness ultrahigh-performance concrete materials, so that the prestressing applying degree can be effectively improved, the stress efficiency of the structure is improved, and the high-efficiency, durable and light-weight bridge structure is facilitated. And the end section 3 is poured by adopting an ultra-high performance concrete material containing coarse aggregate, so that the steel bar structure of an anchoring area can be simplified, spiral steel bars and reinforcing construction steel bars matched with prestress bundles in the related art can be omitted, and the concrete pouring, vibrating and compacting are facilitated.

The embodiment of the application also provides a construction method of the combined T beam, which can comprise the following steps:

S1: the connecting steel bars are placed at preset positions in the T-beam mold, the connecting steel bars comprise first steel bars 21 and prestressed steel bars 22, in this embodiment, the T-beam mold is installed after the first steel bars 21 and the prestressed steel bars 22 are pre-embedded at preset positions, or the first steel bars 21 and the prestressed steel bars 22 are placed in the T-beam mold after the T-beam mold is manufactured. The diagonal bars of the inverted U-shaped bar 1122 may be welded to the first bar 21 before or after the T-beam mold is installed, so that the inverted U-shaped bar 1122 can also be installed. In some alternative embodiments, a plurality of reinforcing steel bar holes can be formed in the top ends of two opposite side plates extending along the longitudinal bridge direction of the T-beam mold, the reinforcing steel bar holes can be formed before the T-beam mold is installed, or can be formed after the T-beam mold is installed, preferably, the reinforcing steel bar holes formed in the two opposite side plates are symmetrically distributed, and reinforcing steel bars extending along the longitudinal bridge direction are inserted into each reinforcing steel bar hole.

S2: the method comprises the steps that first concrete is initially poured in a preset area in a T beam mold to form a middle section 1 extending along a longitudinal bridge, meanwhile, preliminary pouring of second concrete is synchronously carried out at two ends of the preset area to form end sections 3 with the same width as that of the middle section 1 along a transverse bridge, preferably, the length of reinforcing steel bars of reinforcing steel bar holes inserted into side plates of the T beam mold along the longitudinal bridge is slightly larger than that of the end sections 3 along the longitudinal bridge, after the end sections 3 are poured and molded, part of the reinforcing steel bars extend from the top end of the end sections 3 towards one side close to the middle section 1, in addition, connecting reinforcing steel bars are pre-buried to the middle section 1 and the end sections 3, grid pieces can be arranged at the boundary between the end sections 3 at the two ends of the T beam mold and the middle section 1, the first reinforcing steel bars 21 and the pre-stressed reinforcing steel bars 22 penetrate through all the grid pieces, and mutual fusion of the two types of concrete can be reduced in the preliminary pouring process by arranging the grid pieces, wherein the height of the preliminarily finished end sections 3 along the beam height is higher than that of the middle section 1 along the height of the middle section 1 along the longitudinal bridge, and the first concrete is higher than the first concrete and the toughness is higher than that of the first concrete; it should be understood that only the first layer 111 of the end section 3 and the middle section 1 is poured in the preliminary pouring, and after the preliminary pouring is completed, the top of the end section 3 and the first layer 111 may be covered with a film and maintained for 3 to 7 days.

S3: the method comprises the steps of roughening the side surfaces of the end sections 3 at two ends close to the middle section 1 and the top surface of the middle section 1 subjected to preliminary casting, casting the middle section 1 again, casting the second layer 112 of the middle section 1, enabling the top surface of the middle section 1 to be flush with the top surface of the end sections 3, enabling reinforcing steel bars extending from the top end of the end sections 3 towards the side close to the middle section 1 to be located above the first layer 112, binding the reinforcing steel bars extending from the end sections 3 with the second reinforcing steel bars before casting the second layer 112, and enabling the second reinforcing steel bars and the reinforcing steel bars to form a longitudinal reinforcing steel bar 1121 together.

Preferably, after pouring the second layer 112, the second layer may be covered with a film again for maintenance for 3 to 7 days, and then the pre-embedded prestressed reinforcement 22 is tensioned, and since the plurality of prestressed reinforcement 22 are fixed into a plurality of wire bundles in the combined T-beam through the corrugated pipe, the tensioning mode may be grouting into the corrugated pipe, releasing the tension after the slurry strength meets the requirement, and then moving the combined T-beam to the beam storage field.

In some alternative embodiments, the preliminary casting of the first concrete in the preset area in the T-beam mold forms a middle section 1 extending along the longitudinal bridge, and the preliminary casting of the second concrete is performed simultaneously at two ends of the preset area, including: in this embodiment, the thickness of concrete poured in each layer is layered according to the thickness of 15-30cm along the beam height direction of the combined T-beam, because the middle part 3 and the middle part 1 can be poured by adopting different concretes, grid plates are arranged in the middle, the middle part 1 and the end part 3 can be conveniently controlled in real time along the beam height direction in the pouring process by adopting the layered pouring mode, the heights of the middle part 1 and the end part 3 along the beam height direction can be kept as consistent as possible, the mode of keeping the heights consistent can be that a template is arranged, the template is attached to the concrete surface during pouring, and the pouring is lifted upwards while pouring, preferably, the template is provided with a plurality of grooves for penetrating various embedded bars, in this embodiment, the layered pouring refers to immediately pouring an upper layer when the concrete of the lower layer is not dried after the lower layer pouring is completed and the heights of the middle part 1 and the end part 3 are kept consistent. When pouring, pouring bottom concrete first, and when pouring the upper layer, vibrating the vibrating rod to penetrate into the lower layer to vibrate, so that the continuity of layered pouring of the middle section 1 and the end section 3 is ensured, namely, the continuity between the upper layer concrete and the lower layer concrete is ensured.

In some alternative embodiments, in order to make the height of the end section 3 in the beam height direction higher than the height of the middle section 1 in the beam height direction after the preliminary pouring of the end section 3 and the middle section 1 is completed, the density above the grid sheet may be made larger, so as to avoid that the ultra-high performance concrete of the end section 3 flows to the second layer 112 of the middle section 1 as much as possible, and the ultra-high performance concrete of the end section 3 is filled with coarse aggregate, so that the stability of the end section 3 may be further ensured.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A composite T-beam, comprising:

The middle section (1), the middle section (1) comprises connecting steel bars and first concrete poured on the connecting steel bars, and the middle section (1) extends along a longitudinal bridge direction;

the utility model discloses a bridge, including middle section (1), bridge support, connecting bar, tip section (3), tip section (1), tip section (3) are connected with tip section (3) respectively at both ends of middle section (1), the both ends of connecting bar stretch into respectively tip section (3), tip section (3) are used for setting up in bridge support, tip section (3) in pour the second concrete on the connecting bar, the intensity of second concrete is greater than the intensity of first concrete, just the toughness of second concrete is higher than the toughness of first concrete, the width of middle section (1) along the horizontal bridge to with the width of tip section (3) along the horizontal bridge is the same.

2. The composite T-beam of claim 1, wherein:

The middle section (1) comprises a first layer (111) and a second layer (112) which are arranged up and down, the second layer (112) is laid on the first layer (111), and second concrete is poured on the second layer (112).

3. The composite T-beam of claim 2, wherein:

The second layer (112) is embedded with longitudinal steel bars (1121), and two ends of the longitudinal steel bars (1121) respectively extend into the end sections (3) positioned at two ends of the middle section (1).

4. A composite T-beam as claimed in claim 3, wherein:

The first layer (111) is pre-buried to have an inverted U-shaped reinforcing bar (1122), and the part of inverted U-shaped reinforcing bar (1122) stretches into second layer (112), makes inverted U-shaped reinforcing bar (1122) surround in at least part longitudinal reinforcement (1121) with the connecting reinforcement is outside.

5. The composite T-beam of claim 4, wherein:

The inverted U-shaped steel bars (1122) are embedded in a plurality of, the inverted U-shaped steel bars (1122) are distributed at intervals along the longitudinal bridge direction, and the distance between every two adjacent inverted U-shaped steel bars (1122) is 200-400 mm.

6. The composite T-beam of claim 2, wherein:

The length of the second layer (112) along the longitudinal bridge direction is larger than that of the first layer (111) along the longitudinal bridge direction, and two ends of the second layer (112) along the longitudinal bridge direction extend into the end section (3).

7. The composite T-beam of claim 1, wherein:

and the second concrete poured by the end section (3) is filled with coarse aggregate.

8. The composite T-beam of claim 1, wherein:

The connecting rebar comprises a first rebar (21), the first rebar (21) extending along the end section (3) at one end thereof to the end section (3) at the other end;

The connecting steel bar further comprises a prestressed steel bar (22), and two ends of the prestressed steel bar (22) respectively extend out of the end sections (3) at two ends of the middle section (1).

9. The composite T-beam of claim 8, wherein:

The middle section (1) comprises a first upper flange (12), a first web (13) and a first bottom plate (14), wherein the first web (13) is used for connecting the first upper flange (12) with the first bottom plate (14), and the prestressed reinforcement (22) is positioned in the first bottom plate (14);

The end section (3) comprises a second upper flange (32), a second web (33) and a second bottom plate (34), the second web (33) connects the second upper flange (32) with the second bottom plate (34), and the prestressed reinforcement (22) extends from the inside of the first bottom plate (14) of the middle section (1) into the second web (33) of the end section (3).

10. The composite T-beam of claim 1, wherein:

The length of the end section (3) along the longitudinal bridge direction is 0.05-0.1 time of the length of the combined T Liang Yanzong bridge direction.