T-beam with pre-tensioning

Abstract

The application discloses a pre-tensioning method prefabricated T beam which comprises a beam body; the beam body extends along a first direction; a first left prestressed member and a first right prestressed member are symmetrically arranged on the beam body along the first direction; the first left prestressed member is at a certain angle with the first direction, and one end of the first left prestressed member is fixed to one end of the beam body along the first direction, and the other end is fixed to the bottom of the beam body; the first left prestressed member and the first right prestressed member are arranged through at least the central cross section of the beam body along the first direction. The pre-tensioning method prefabricated T beam saves engineering cost, simplifies construction procedures, improves production efficiency, and improves the bearing capacity and prestress of the beam body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction, and in particular to a pre-tensioning method for precasting a T-shaped beam. BACKGROUND

[0002] The precast T-shaped beam is widely used in highway bridges and urban bridges due to its simple cross-sectional shape, maximum extension of the flanges on both sides, saving of concrete, light self-weight, strong spanning capacity, large bearing capacity, low maintenance cost and other advantages.

[0003] The traditional post-tensioning method for precasting a T-shaped beam has the following disadvantages: 1. The concrete is easy to seep into the prestressed pipe during pouring, which blocks the pipe and makes it difficult to dredge, thereby increasing the construction cost; 2. Since the prestressed pipe is arranged in a concave curve, the inlet and outlet of the grouting are located on the anchor pads at both ends, which are at the highest point of the pipe curve. Therefore, due to the flow of the slurry, air pockets may be trapped in the grouting pipe during the grouting process, which may cause the grouting to be not dense enough, thereby affecting the durability of the prestress; 3. The curved prestressed pipe is easy to deform during pouring of the precast beam concrete, which affects the smoothness and fluency of the actual curve of the pipe. The friction force generated when the prestressed tendon contacts the pipe wall is greater than the theoretical calculation, which may result in insufficient prestress, thereby affecting the stress performance and service life of the structure; 4. The prestressed tendon anchor and the pipe are permanent structures and cannot be reused, which is relatively expensive. SUMMARY

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a pre-tensioning method for precasting a T-shaped beam, which saves the engineering cost, simplifies the construction process, improves the production efficiency, and improves the bearing capacity and prestress in the beam body.

[0005] The pre-tensioning method for precasting a T-shaped beam according to the embodiment of the present application comprises: a beam body extending along a first direction; a first left prestressed member and a first right prestressed member symmetrically arranged on the beam body along the first direction, the first left prestressed member being at a certain angle with the first direction, one end of the first left prestressed member being fixed to one end of the beam body along the first direction, and the other end being fixed to the bottom of the beam body; and the first left prestressed member and the first right prestressed member each passing through at least the center cross section of the beam body along the first direction.

[0006] Compared with the post-tensioning method, the pre-tensioning method precast T beam of the application saves the engineering cost, the anchoring clamp for fixing the pre-stressed member can be repeatedly used, and the pre-stress loss caused by the friction between the pre-stressed member and the pre-stress pipe is avoided, so that the effective bearing capacity of the structure is ensured. In the pre-tensioning method, the pre-stressed member is arranged in the pre-stress pipe, which is changed to be arranged in the beam body, the pre-stressed member is uniformly distributed, and the pre-stress at different positions of the beam body is uniformly distributed. The linear arrangement of the pre-stressed member in the application is convenient to position, the precision can be effectively controlled, the construction process is simplified, and the production efficiency is high. The first left pre-stressed member and the first right pre-stressed member are arranged to pass through the center cross section of the beam body along the first direction, so that the bearing capacity and the pre-stress in the middle of the beam body are improved.

[0007] According to some embodiments of the application, the first left pre-stressed member and the first right pre-stressed member pass through the first cross section and the second cross section of the beam body along the first direction, and the first cross section and the second cross section are respectively located on opposite sides of the center cross section along the first direction.

[0008] According to some embodiments of the application, the distance between the first cross section and the second cross section along the first direction is l1, and the length of the beam body along the first direction is l2, wherein (1 / 25)l2≤l1≤(1 / 2)l2.

[0009] According to some embodiments of the application, the second left pre-stressed member and the second right pre-stressed member are symmetrically arranged in the beam body along the first direction, the second left pre-stressed member is at an angle with the first direction, one end of the second left pre-stressed member is fixed to one end of the beam body along the first direction, and the other end of the second left pre-stressed member is fixed to the bottom of the beam body.

[0010] The first cross section and the second cross section are respectively located on opposite sides of the center cross section along the first direction.

[0011] According to some embodiments of the application, along the first direction, the distance between the one end of the second left pre-stressed member connected with the bottom of the beam body and the one end of the second right pre-stressed member connected with the bottom of the beam body is l3, and the length of the beam body along the first direction is l2, wherein (1 / 8)l2≤l3≤(2 / 3)l2.

[0012] According to some embodiments of the application, the first left pre-stressed member is parallel to the second left pre-stressed member.

[0013] According to some embodiments of the present application, the first left prestressed member forms an angle of a1 with the first direction, 5°≤a1≤20°;

[0014] The second left prestressed member forms an angle of a2 with the first direction, 5°≤a2≤20°.

[0015] According to some embodiments of the present application, along a second direction, the first left prestressed members are arranged in multiple, and the first right prestressed members are arranged in multiple one-to-one corresponding to the first left prestressed members, the second direction being a height direction of the beam body.

[0016] Along the second direction, the second left prestressed members are arranged in multiple, and the second right prestressed members are arranged in multiple one-to-one corresponding to the first left prestressed members.

[0017] According to some embodiments of the present application, along a third direction, the first left prestressed members and the first right prestressed members are arranged in multiple, the third direction being a width direction of the beam body.

[0018] According to some embodiments of the present application, along a third direction, the first left prestressed members are arranged in multiple, and the first right prestressed members are arranged in multiple one-to-one corresponding to the first left prestressed members, the multiple first left prestressed members and the multiple first right prestressed members being arranged in staggered manner, the third direction being a width direction of the beam body.

[0019] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic view of an elevation of a prefabricated T-beam according to embodiments of the present application;

[0021] Figure 2 is a schematic view of prestressed member arrangement in a prefabricated T-beam according to embodiments of the present application;

[0022] Figure 3 is a schematic view of a cross section of a prefabricated T-beam according to embodiments of the present application;

[0023] Figure 4 is a schematic view of a cross section of a prefabricated T-beam according to embodiments of the present application; Figure 1 at A-A in FIG. 1;

[0024] Figure 5 is a schematic view of a cross section of a prefabricated T-beam according to embodiments of the present application; Figure 1 at B-B in FIG. 1;

[0025] Figure 6 is a schematic view of a cross section of a prefabricated T-beam according to embodiments of the present application; Figure 1 at C-C in FIG. 1;

[0026] Figure 7 is Figure 1 a schematic view at D-D in Fig.

[0027] Reference numerals:

[0028] a precast T-beam 100,

[0029] a beam body 10, a central cross section 10a, a first cross section 10b, a second cross section 10c,

[0030] a first left prestressing member 20, a first right prestressing member 30, a second left prestressing member 40, a second right prestressing member 50. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters are used throughout the drawing figures and the following description to indicate like components. The embodiments described below are merely exemplary for the purposes of explanation and are not intended to limit the application, which is set forth in the appended claims.

[0032] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For purposes of explanation and non- limitation, specific details of certain examples are set forth below. Of course, it is to be understood that not necessarily all examples described below will be encompassed by the application, and that specific examples can be replaced by other examples. Moreover, the application is not intended to be limited by the examples described below, which are presented solely for purposes of explanation and should not be considered to be describing the only examples incorporating the application. Additionally, the application provides examples of various specific processes and materials, but one skilled in the art will recognize that other processes and / or materials can be used.

[0033] A precast T-beam 100 according to an embodiment of the present application is described below with reference to the attached drawings.

[0034] With reference to Figures 1-3 , a precast T-beam 100 according to an embodiment of the present application includes a beam body 10 extending along a first direction. Exemplarily, the first direction can be a length direction of the beam body 10.

[0035] A first left prestressing member 20 and a first right prestressing member 30 are symmetrically arranged on the beam body 10 along the first direction.

[0036] It is to be noted that the first left prestressing member 20 and the first right prestressing member 30 can be in the same plane, or can be parallel along a third direction.

[0037] The first left prestressed member 20 and the first right prestressed member 30 can be single prestressed steel bars, which can be fully bonded with the concrete and the prestressed steel bar tension is uniformly distributed compared with the prestressed steel beam in the post-tensioning method.

[0038] The first left prestressed member 20 is at an angle with the first direction, and one end is fixed to one end of the beam body 10 along the first direction, and the other end is fixed to the bottom of the beam body 10. Correspondingly, the first right prestressed member 30 is at an angle with the first direction, and one end is fixed to the other end of the beam body 10 along the first direction, and the other end is fixed to the bottom of the beam body 10.

[0039] The first left prestressed member 20 and the first right prestressed member 30 are arranged in a straight line, which is convenient to position, the precision can be effectively controlled, the construction process is simplified, and the production efficiency is high compared with the long beam curve shape.

[0040] Compared with the construction of the post-tensioning method, the anchoring clamp for fixing the prestressed member can be repeatedly used, and there is no need to set a prestressed pipe, which saves the engineering cost, and at the same time, the prestress loss caused by the friction between the prestressed member and the prestressed pipe does not occur, which ensures the effective bearing capacity of the structure.

[0041] The first left prestressed member 20 and the first right prestressed member 30 are arranged in a straight line, which is convenient to position, the precision can be effectively controlled, the construction process is simplified, and the production efficiency is high compared with the long beam curve shape.

[0042] The first left prestressed member 20 and the first right prestressed member 30 can be arranged in a straight line, which is convenient to position, the precision can be effectively controlled, the construction process is simplified, and the production efficiency is high compared with the long beam curve shape.

[0043] Therefore, with reference to Figures 1-3 , the pre-tensioning method prefabricated T-beam 100 according to the present application, compared with the post-tensioning method, needs to set a prestressed pipe, and the anchoring clamp for fixing the prestressed member can be repeatedly used, which saves the engineering cost, and at the same time, the prestress loss caused by the friction between the prestressed member and the prestressed pipe does not occur, which ensures the effective bearing capacity of the structure. The prestressed steel beam arranged in the prestressed pipe in the post-tensioning method is replaced by a single prestressed member arranged in the beam body 10, the prestressed member is uniformly distributed, and can be fully bonded with the concrete, so that the prestress distribution of the beam body 10 at different positions is uniform. The straight line arrangement of the prestressed member in the present application is convenient to position, the precision can be effectively controlled, the construction process is simplified, and the production efficiency is high compared with the long beam curve shape. The first left prestressed member 20 and the first right prestressed member 30 are arranged in a straight line, which is convenient to position, the precision can be effectively controlled, the construction process is simplified, and the production efficiency is high compared with the long beam curve shape.

[0044] In some embodiments of the present application, referring to Figures 1-3 , the first left pre-stressed member 20 and the first right pre-stressed member 30 are arranged to pass through the first cross section 10b and the second cross section 10c of the beam body 10 along the first direction, and the first cross section 10b and the second cross section 10c are respectively located on the opposite sides of the center cross section 10a along the first direction.

[0045] By arranging the first left pre-stressed member 20 and the first right pre-stressed member 30 to pass through the first cross section 10b and the second cross section 10c of the beam body 10 along the first direction, respectively located on the opposite sides of the center cross section 10a along the first direction, the intersection area of the first left pre-stressed member 20 and the first right pre-stressed member 30 in the span of the beam body 10 is increased, and the load bearing capacity and the pre-stress in the span of the beam body 10 are further improved.

[0046] It can be understood that the distance between the first cross section 10b and the center cross section 10a along the first direction and the distance between the second cross section 10c and the center cross section 10a along the first direction can be the same; or can be different, for example, the distance between the first cross section 10b and the center cross section 10a along the first direction can be greater than or less than the distance between the second cross section 10c and the center cross section 10a along the first direction. Preferably, the distance between the first cross section 10b and the center cross section 10a along the first direction and the distance between the second cross section 10c and the center cross section 10a along the first direction are the same.

[0047] In some embodiments of the present application, referring to Figure 1 and Figure 3 , the distance between the first cross section 10b and the second cross section 10c along the first direction is l1, and the length of the beam body 10 along the first direction is l2, wherein (1 / 25) l2≤l1≤(1 / 2) l2.

[0048] By setting the distance l1 between the first cross section 10b and the second cross section 10c along the first direction to (1 / 25) l2-(1 / 2) l2, the arrangement is facilitated, and the load bearing capacity and the pre-stress in the span are ensured.

[0049] Specifically, the distance l1 between the first cross section 10b and the second cross section 10c along the first direction can be (1 / 25) l2, (1 / 20) l2, (1 / 15) l2, (1 / 10) l2, (1 / 8) l2, (1 / 6) l2, (1 / 4) l2, (1 / 2) l2, etc.

[0050] In some embodiments of the present application, referring to Figure 1 , Figure 2 and Figure 4The first-tensioning method prefabricated T beam 100 further comprises a second left prestressing member 40 and a second right prestressing member 50, the second left prestressing member 40 and the second right prestressing member 50 are symmetrically arranged along the first direction on the beam body 10, and the second left prestressing member 40 and the second right prestressing member 50 can be in the same plane or can be parallel along the third direction.

[0051] The second left prestressing member 40 is at an angle with the first direction, and one end is fixed to one end of the beam body 10 along the first direction, and the other end is fixed to the bottom of the beam body 10; correspondingly, the second right prestressing member 50 is at an angle with the first direction, and one end is fixed to the other end of the beam body 10 along the first direction, and the other end is fixed to the bottom of the beam body 10.

[0052] The second left prestressing member 40 and the second right prestressing member 50 can be a single prestressed steel bar, which can be fully wrapped and bonded with concrete compared with prestressed steel strands in the post-tensioning method, and the prestressed steel bar tension is uniformly distributed.

[0053] The one end of the second left prestressing member 40 connected with the bottom of the beam body 10 and the one end of the second right prestressing member 50 connected with the bottom of the beam body 10 are respectively located on opposite sides of the central cross section 10a of the beam body 10 along the first direction, so as to improve the bearing capacity and prestress of the beam body 10 at the position between the central cross section and the two ends of the beam body 10.

[0054] In some embodiments of the present application, with reference to Figure 2 The distance between the one end of the second left prestressing member 40 connected with the bottom of the beam body 10 and the one end of the second right prestressing member 50 connected with the bottom of the beam body 10 along the first direction is l3, and the length of the beam body 10 along the first direction is l2, wherein (1 / 8) l2≤l3≤(2 / 3) l2.

[0055] By setting the distance l3 between the one end of the second left prestressing member 40 connected with the bottom of the beam body 10 and the one end of the second right prestressing member 50 connected with the bottom of the beam body 10 along the first direction to (1 / 8) l2-(2 / 3) l2, the arrangement is facilitated, and the bearing capacity and prestress of the beam body 10 on both sides of the span are ensured.

[0056] Specifically, the distance l3 between the one end of the second left prestressing member 40 connected with the bottom of the beam body 10 and the one end of the second right prestressing member 50 connected with the bottom of the beam body 10 can be (1 / 8) l2, (1 / 7) l2, (1 / 6) l2, (1 / 5) l2, (1 / 4) l2, (1 / 3) l2, (1 / 2) l2, (2 / 3) l2, etc.

[0057] In some embodiments of the present application, with reference to Figure 1 and Figure 2The first left prestressing member 20 is parallel to the second left prestressing member 40.

[0058] The parallel arrangement of the first left prestressing member 20 and the second left prestressing member 40 facilitates the arrangement and makes the prestress of the beam body 10 uniform.

[0059] Of course, it can be understood that the angle between the first left prestress and the first direction is different from the angle between the second left prestress and the first direction. For example, the angle between the first left prestress and the first direction can be greater than the angle between the second left prestress and the first direction, or the angle between the first left prestress and the first direction can be less than the angle between the second left prestress and the first direction. Preferably, when the angle between the first left prestress and the first direction is different from the angle between the second left prestress and the first direction, the angle between the first left prestress and the first direction is greater than the angle between the second left prestress and the first direction.

[0060] Correspondingly, the first right prestressing member 30 is parallel to the second right prestressing member 50.

[0061] The other arrangement of the angle between the first right prestressing member 30 and the first direction and the angle between the second right prestressing member 50 and the first direction is referred to the above arrangement of the angle between the first left prestressing member 20 and the first direction and the angle between the second left prestressing member 40 and the first direction, which will not be described here.

[0062] In some embodiments of the present application, with reference to Figure 1 The angle between the first left prestressing member 20 and the first direction is α1, and 5°≤α1≤20°; the angle between the second left prestressing member 40 and the first direction is α2, and 5°≤α2≤20°.

[0063] By setting the range of the angle α1 between the first left prestressing member 20 and the first direction and the angle α2 between the second left prestressing member 40 and the first direction to 5°-20°, the first left prestressing member 20 can be arranged at the central cross section 10a of the beam body 10 along the first direction, and the second left prestressing member 40 can be located on one side of the central cross section 10a of the beam body 10 along the first direction, thereby ensuring the bearing capacity and prestress of the beam body 10.

[0064] Specifically, the angle α1 between the first left prestressing member 20 and the first direction can be 5°, 7°, 8°, 11°, 13°, 14°, 16°, 18°, 20°, etc.

[0065] The angle α1 between the second left prestressing member 40 and the first direction can be 5°, 7°, 8°, 11°, 13°, 14°, 16°, 18°, 20°, etc.

[0066] Correspondingly, the first right prestressed member 30 and the first direction angle is a1, 5°≤a1≤20°; the second right prestressed member 50 and the first direction angle is a2, 5°≤a2≤20°, so that the first left prestressed member 20 and the first right prestressed member 30 can cross at the center cross section 10a of the beam body 10 along the first direction, and the second left prestressed member 40 and the second right prestressed member 50 can be located on the opposite sides of the center cross section 10a of the beam body 10 along the first direction.

[0067] In some embodiments, the first right prestressed member 30 and the first direction angle a1 can be 5°, 7°, 8°, 11°, 13°, 14°, 16°, 18°, 20°, etc.

[0068] The second right prestressed member 50 and the first direction angle a1 can be 5°, 7°, 8°, 11°, 13°, 14°, 16°, 18°, 20°, etc.

[0069] In some embodiments of the present application, referring to Figures 4-7 , along the second direction, the first left prestressed member 20 is spaced apart as a plurality, and the first right prestressed member corresponding to the plurality of first left prestressed members 20 is spaced apart as a plurality, and the second direction is the height direction of the beam body 10;

[0070] By spacing a plurality of first left prestressed members 20 along the second direction and spacing a plurality of first right prestressed members 30 corresponding to the plurality of first left prestressed members 20, the carrying capacity and prestress of the beam body 10 are improved.

[0071] Along the second direction, the second left prestressed member 40 is spaced apart as a plurality, and the second right prestressed member corresponding to the plurality of first left prestressed members 20 is spaced apart as a plurality.

[0072] By spacing a plurality of second left prestressed members 40 along the second direction and spacing a plurality of second right prestressed members 50 corresponding to the plurality of second left prestressed members 40, the carrying capacity and prestress of the beam body 10 are improved.

[0073] It can be understood that the first left prestressed member 20 and the second left prestressed member 40 are spaced apart along the second direction to avoid crossing. Correspondingly, the first right prestressed member 30 and the second right prestressed member 50 are spaced apart along the second direction.

[0074] The plurality of first left prestresses, the plurality of second left prestresses 40, the plurality of first right prestresses, and the plurality of second right prestresses 50 can be arranged at intervals or randomly. Preferably, the plurality of first left prestresses, the plurality of second left prestresses 40, the plurality of first right prestresses, and the plurality of second right prestresses 50 are arranged at intervals.

[0075] The interval between the adjacent first left prestress 20 and the second left prestress 40 can be the same as or different from the interval between two adjacent first left prestresses 20. Preferably, the interval between the adjacent first left prestress 20 and the second left prestress 40 is the same as the interval between two adjacent first left prestresses 20. Correspondingly, the interval between the adjacent first right prestress 30 and the second right prestress 50 is preferably the same as the interval between two adjacent first right prestresses 30.

[0076] In some embodiments of the present application, referring to Figures 4-7 , the first left prestress 20 and the first right prestress 30 are arranged at intervals along the third direction, and the third direction is the width direction of the beam body 10.

[0077] By arranging the first left prestress 20 and the first right prestress 30 at intervals along the third direction, the arrangement of the first left prestress 20 and the first right prestress 30 at the intersection is facilitated.

[0078] The second left prestress 40 and the second right prestress 50 can be arranged at intervals or in the same plane along the third direction. Preferably, the second left prestress 40 and the second right prestress 50 are arranged at intervals along the third direction.

[0079] In some embodiments of the present application, referring to Figures 4-7 , the first left prestress 20 is arranged at intervals along the third direction, the first right prestress is arranged at intervals corresponding to the plurality of first left prestresses 20, and the plurality of first left prestresses 20 and the plurality of first right prestresses 30 are arranged alternately, and the third direction is the width direction of the beam body 10.

[0080] The first left prestress 20 and the first right prestress are arranged at intervals along the third direction, so that the beam body 10 has uniform prestress in the third direction. The plurality of first left prestresses 20 and the plurality of first right prestresses 30 are arranged alternately along the third direction, so that the two ends of the beam body 10 are subjected to uniform prestress in the third direction.

[0081] Correspondingly, along the third direction, the second left prestress members 40 are spaced apart in a plurality of manners, the second right prestress members 50 are spaced apart in a plurality of manners one by one corresponding to the plurality of second left prestress members 40, and the plurality of second left prestress members 40 and the plurality of second right prestress members 50 are staggered.

[0082] The plurality of first left prestress members 20 along the third direction can be spaced apart in the same interval or in different intervals, preferably, the plurality of first left prestress members 20 along the third direction are spaced apart in the same interval. Correspondingly, preferably, the plurality of first right prestress members 30 along the third direction are spaced apart in the same interval. Along the third direction, the first right prestress members 30 can be located at any position between two adjacent first prestress members. Preferably, the first right prestress members 30 can be located at the center of two adjacent first prestress members.

[0083] The positional relationship between the plurality of second left prestress members 40, between the plurality of second right prestress members 50, and between the second left prestress members 40 and the second right prestress members 50 is referred to the positional relationship between the plurality of first left prestress members 20, between the plurality of first right prestress members 30, and between the first left prestress members 20 and the first right prestress members 30, which will not be described here.

[0084] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “axial”, “radial”, “circumferential” and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0085] In the present application, unless specifically defined and limited otherwise, the terms “mounting”, “connection”, “connecting”, “fixing” and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be mechanical connection, can also be electrical connection, or can be communication; can be directly connected, or indirectly connected through an intermediate medium; can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0086] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or means that the first feature is horizontally lower than the second feature.

[0087] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0088] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A pre-tensioned precast T-beam, characterized by, The beam body extends along a first direction; A first left prestressed member and a first right prestressed member are symmetrically arranged on the beam body along the first direction, one end of the first left prestressed member is fixed to one end of the beam body along the first direction, the other end is fixed to the bottom of the beam body, one end of the first right prestressed member is fixed to the other end of the beam body along the first direction, and the other end is fixed to the bottom of the beam body; Both the first left prestressed member and the first right prestressed member pass through the center cross section of the beam body along the first direction; Both the first left prestressed member and the first right prestressed member pass through the first cross section and the second cross section of the beam body along the first direction, and the first cross section and the second cross section are respectively located on the opposite sides of the center cross section along the first direction. The distance between the first cross section and the second cross section along the first direction is l1, and the length of the beam body along the first direction is l2, wherein (1 / 25)l2≤l1≤(1 / 2)l2.

2. The precast T beam according to claim 1, characterized in that, A second left prestressed member and a second right prestressed member are symmetrically arranged on the beam body along the first direction, one end of the second left prestressed member is fixed to one end of the beam body along the first direction, and the other end is fixed to the bottom of the beam body; 3. The precast T beam according to claim 1, characterized in that, The first left prestressed member and the first right prestressed member are symmetrically arranged on the beam body along the first direction, one end of the first left prestressed member is fixed to one end of the beam body along the first direction, the other end is fixed to the bottom of the beam body, one end of the first right prestressed member is fixed to the other end of the beam body along the first direction, and the other end is fixed to the bottom of the beam body; Along the first direction, the distance between the end of the second left prestressed member connected to the bottom of the beam body and the end of the second right prestressed member connected to the bottom of the beam body is l3, and the length of the beam body along the first direction is l2, wherein (1 / 8)l2≤l3≤(2 / 3)l2.

4. The precast T beam according to claim 3, characterized in that, The first left prestressed member is parallel to the second left prestressed member.

5. The precast T beam according to claim 3, wherein, The angle between the first left prestressed member and the first direction is α1, and 5°≤α1≤20°; 6. The precast T beam according to claim 3, wherein, The angle between the second left prestressed member and the first direction is α2, and 5°≤α2≤20°. Along the second direction, the first left prestressed member is arranged in multiple, and the first right prestressed member is arranged in multiple corresponding to the first left prestressed member, and the second direction is the height direction of the beam body; 7. The precast T beam according to claim 3, wherein, Along the second direction, the second left prestressed member is arranged in multiple, and the second right prestressed member is arranged in multiple corresponding to the first left prestressed member. Along the third direction, the first left prestressed member and the first right prestressed member are arranged in multiple, and the third direction is the width direction of the beam body.

8. The precast T beam according to claim 1, wherein, ​ 9. The precast T beam according to claim 1, wherein, In the third direction, the first left pre-stressed members are arranged in multiple, the first right pre-stressed members are arranged in multiple one by one corresponding to the first left pre-stressed members, the first left pre-stressed members and the first right pre-stressed members are arranged in staggered, and the third direction is the width direction of the beam body.

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