CN110485278A - A kind of half stealth of falling T bent cap construction - Google Patents

Abstract

A semi-inverted T invisible cover beam structure. The simply supported beams on both sides rest on the inverted T-shaped cover beam. The middle beam of the simply supported beam is provided with corbels. , there is a gap between the end faces of the middle beam corbels of the simply supported beams on both sides, and a gap between the end faces of the side girders of the simply supported beams on both sides. The inverted T part of the cover beam is located between the simply supported beams on the left and right sides. In the transverse bridge direction, the inverted T part of the cover beam is located between the side beams on both sides. The inverted T part of the cover beam is blocked by the simply supported beams on both sides in the above three directions to achieve an invisible effect. It has the advantages of low building height of the conventional inverted T cover beam, and at the same time, the inverted T part of the cover beam can be blocked by simply supported beams, and there is only one gap left on the bridge deck. Compared with the conventional inverted T cover beam, it has the advantages of simple and convenient continuous bridge deck construction The unique advantages of good driving comfort and good landscape effect.

Description

A Half Inverted T Invisible Cover Beam Structure

technical field

The invention relates to the technical field of bridge structure design, in particular to a semi-inverted T invisible cover beam structure.

Background technique

At present, simply supported beams are widely used in small and medium span bridges because of their simple structure, suitable prefabricated assembly technology, and fast construction speed. Placing multiple pieces of simply supported beams on an inverted T-shaped cover beam is a commonly used bridge structure type. The conventional inverted T-shaped cover beam has the advantage of low structural height and is widely used in urban viaducts. The side simply supported girders form two gaps, resulting in high construction requirements for the continuous structure of the bridge deck, poor durability, double slits at the expansion joints affect driving comfort, and poor appearance.

Contents of the invention

The object of the present invention is to provide a semi-inverted T invisible cover beam structure, which has the advantages of low construction height of conventional inverted T cover beams, and at the same time, after the special structure treatment of simply supported beams and cover beams, the inverted T part of the cover beam The top surface, facade and sides can be covered by simply supported beams, and there is only one gap left on the bridge deck (expansion joints and continuous joints on the bridge deck are reduced by half compared with ordinary inverted T cover beams). Compared with conventional inverted T cover beams, It has the unique advantages of simple continuous bridge deck construction, good driving comfort and good landscape effect.

In order to achieve the above object, the technical solution of the present invention is as follows: a semi-inverted T invisible cover beam structure, which is characterized in that the simply supported beams on both sides rest on the inverted T-shaped cover beams, and the upper edges of the two ends of the simply supported beam middle beams are arranged Along the bridge to the corbel, both sides are located above the top of the inverted T part of the cover beam along the bridge, and the transverse bridge extends to the inverted T part of the cover beam to a certain distance from the end of the cover beam, forming a transverse bridge at the end of the cover beam. Bridge to the corbel, so that the side girders on both sides can not be separated from the interval of the inverted T part; along the bridge direction, there is a gap between the end faces of the simply supported beam on both sides to the bridge, and the simply supported beam sides on both sides The beam passes through both sides of the inverted T part of the cover beam, and there is a gap between the end faces. The above-mentioned gap is processed by the bridge deck continuous or expansion joint structure; along the bridge direction, the inverted T part of the cover beam is simply supported on the left and right sides. Between the girders, in the transverse bridge direction, the inverted T part of the cover girder is located between the side girders on both sides; The three directions are blocked by simply supported beams on both sides to achieve an invisible effect.

Further, permanent supports are provided on the corbels on both sides of the inverted T-shaped cover beam to rest the simply supported beams on both sides.

Further, in the direction of the bridge, there is a gap between the end of the middle girder of the simply supported beam on both sides, that is, the root of the corbel in the direction of the bridge and the inverted T part of the cover beam; in the direction of the bridge, the side beam of the simply supported beam and the cover beam There is a gap between the sides of the inverted T part. In the height direction, there is a gap between the bottom of the bridge-facing corbel of the simply supported beam and the top of the inverted T part of the cover beam; the above gaps do not need to be continuous or Expansion joint construction treatment.

Furthermore, the cross-bridge corbel structure at the transverse end of the semi-inverted T invisible cover girder is the key stress-bearing part, and the bending of the prestressed steel beam at the cross-bridge corbel can effectively improve the shear resistance of the corbel.

Further, the end of the prestressed steel beam extending to the side of the cover beam is set as the tension end, and the end extending to the bottom of the cover beam is set as the fixed end, which avoids the tensioning and anchoring of the prestressed steel beam at the bottom of the cover beam construction, reducing the difficulty of construction.

Another object of the present invention is to provide a construction method of a semi-inverted T invisible cap beam structure, comprising the following steps:

A. Pouring half-inverted T-shaped cover beam concrete or installing half-inverted T-shaped cover beam concrete segment;

B. The first batch of prestressed steel tendons of the tensioned cover beam;

C. Hoisting the middle beam and side beams; the simply supported beams on both sides are rested on the inverted T-shaped cover beam through the support, the middle beam is set along the bridge to the corbel, and the middle beams on both sides are located above the top of the inverted T part of the cover beam along the bridge to the corbel , in the bridge direction, there is a gap between the end faces of the center girder on both sides along the bridge direction, and there is a gap between the end faces of the side beams of the simply supported beams on both sides;

D. The second batch of prestressed steel tendons of the tensioned cover beam;

E. According to the design plan, carry out bridge deck continuous or expansion joint construction treatment on the gap mentioned in C.

The "half inverted T invisible cover beam" of the present invention is relative to the conventional inverted T-shaped cover beam. The inverted T part of the cover beam in the direction of the cross bridge does not extend to the end of the cover beam, so that the side beams on both sides can not be separated from the interval of the inverted T part. ; In the height direction, the top height of the inverted T part is lower than the top height of the simply supported beam, so that the middle beam can pass above the inverted T by setting corbels on the top.

The technical solution of the present invention has obvious technical characteristics. First, the inverted T part of the cover beam is blocked by simply supported beams on both sides to achieve an invisible effect; The position is transferred from between the simply supported beams on both sides of the conventional inverted T cover beam and the inverted T part to between the simply supported beams on both sides, and the bridge deck expansion joints and continuous joints are reduced from two to one in the conventional inverted T cover beam. It is more reliable, the process is simpler, and the driving comfort is better; third, when calculating the force, the cover beam is not affected by the temperature gradient, which improves the structural safety.

Description of drawings

Fig. 1 is a detailed diagram of the layout of the structure along the bridge to the facade of the present invention (the outline of the cover beam structure is schematic, not limited to the shape of the outer outline in the figure);

Fig. 2 is a cross-sectional layout diagram of structure A-A of the present invention (the simply supported beam of the section is illustrated by a small box girder structure, and is not limited to the use of a small box girder);

Fig. 3 is a cross-sectional layout diagram of structure B-B of the present invention (the simply supported beam in the section is illustrated by a small box girder structure, and is not limited to the use of a small box girder).

Fig. 4 is one of the schematic diagrams of the facade layout of the prestressed steel tendons constructed in the present invention (the outline of the cover beam structure and the number and shape of the prestressed steel tendons are for reference, not limited to the illustration in the figure);

Fig. 5 is the second schematic diagram of the facade layout of the prestressed steel tendons constructed in the present invention (the outline of the cover beam structure and the number and shape of the prestressed steel tendons are for reference, not limited to the illustration in the figure);

Figure 6 is a schematic diagram of the cross-sectional layout of the prestressed steel tendons constructed in the present invention (the outline of the cover beam structure and the number and shape of the prestressed steel tendons are for reference, not limited to the illustration in the figure).

Detailed ways

Below in conjunction with accompanying drawing, the present invention will be further described:

The present invention is a semi-inverted T invisible cover beam structure scheme. This structure is mainly composed of the following parts: semi-inverted T-shaped cover beam 1, simply supported beams on both sides (side beam 2a, middle beam 2b), middle beam along the bridge direction Leg 3. Simply supported beam supports on both sides (including pad stones) 4. The inverted T part of the semi-inverted T-shaped cover beam 5. The first gap between the side beam of the transverse bridge and the side of the inverted T side of the simply supported beam 6. The second gap between the bottom of the simply supported beam center girder along the bridge to the corbel and the top of the inverted T 7, the third gap between the end faces of the simply supported beam center girder along the bridge to the corbel and between the end faces of the side girders of the simply supported beam 8, the simple support on both sides The fourth gap 9 between the end of the middle beam of the support beam (the root of the corbel) and the inverted T of the cover beam, and the cross bridge direction corbel 10 at the lateral end of the cover beam.

A semi-inverted T invisible cover beam structure, the specific implementation method is: the simply supported beams on both sides (side beam 2a, middle beam 2b) rest on the inverted T-shaped cover beam 1 through the support 4, in the direction of the bridge, the cover The beam inverted T part 5 is located between the left and right simply supported beams (side girder 2a, center beam 2b). In the transverse direction, the cover beam inverted T part 5 is located between the two side beams 2a. The inverted T part 5 is located below the corbel 3 of the center girder along the bridge.

The inverted T part 5 of the cover beam is blocked by simply supported beams on both sides (side girder 2a, middle girder 2b) in the transverse bridge direction, along the bridge direction and in the height direction, so as to achieve an invisible landscape effect; at the same time, the continuous joints and expansion joints of the bridge deck The position of the conventional inverted T cover beam is transferred from between the simply supported beams on both sides and the inverted T part (the fourth gap 9) to between the simply supported beams on both sides (the third gap 8), and its number is compared with that of the conventional inverted T The shape cap beam is reduced by half, which has the unique advantages of simple continuous construction of the bridge deck and good driving comfort.

In the present invention, the horizontal end of the bottom of the cover beam is provided with a cross bridge facing the corbel 10, and the cross bridge facing the corbel 10 is a key stress-bearing part. The first batch of steel tendons N1, and the second batch of steel tendons, wherein the second batch of prestressed steel tendons includes the second steel tendons N2, the third steel tendons N3, the fourth steel tendons N4, and the fifth steel tendons N5 arranged in a staggered manner , the second batch of prestressed steel tendons are bent down towards the corbel at the cross bridge, which can effectively improve the shear resistance of the corbel;

Both ends of the first batch of prestressed steel tendons N1 are tension ends, which are set on the side of the inverted T part of the cover beam, while the end of the second batch of prestressed steel tendons extending to the side of the cover beam is set as a tension end, extending to One end of the bottom surface of the cover beam is set as a fixed end, which avoids the tensioning and anchoring construction of the prestressed steel beam at the bottom of the cover beam, and reduces the difficulty of construction.

A semi-inverted T invisible cover beam structure, the details of which are described as follows: along the bridge direction, between the end faces of the middle girder 2b of the simply supported beam on both sides along the bridge direction corbel 3 and between the end faces of the simply supported beam side girder 2a on both sides A third gap 8 is provided, and the bridge deck continuous or expansion joint construction treatment is performed on the third gap 8 . In the direction along the bridge, there is a fourth gap 9 between the end of the middle girder 2b of the simply supported beam on both sides (3 roots of the center girder along the bridge to the corbel) and the inverted T part 5 of the cover beam; A first gap 6 is provided between the side of 2a and the side of the inverted T part 5; in the height direction, a second gap 7 is provided between the bottom of the corbel 3 and the top of the inverted T part 5; The above-mentioned fourth gap 9, first gap 6, and second gap 7 do not need to be treated with bridge deck continuity or expansion joint construction.

A semi-inverted T invisible cover beam structure, its specific implementation steps are:

A. Pouring half-inverted T-shaped cover beam concrete or installing half-inverted T-shaped cover beam concrete segment;

B. Before the construction of simply supported beams on both sides, the first batch of prestressed steel tendons of the tension cover beam (the first steel tendon N1 in Figure 4);

C. Construction of simply supported girders on both sides (side girder 2a, middle girder 2b) and middle girder along the bridge to the corbel 3, the simply supported girders on both sides are placed on the inverted T-shaped cover beam, and the middle girder of the simply supported beam is set along the bridge to the corbel , the middle girder on both sides along the bridge direction corbel is located above the top of the inverted T part of the cover beam, and along the bridge direction, the center girder on both sides of the simply supported beam 2b between the end faces of the bridge direction corbel 3 and the end face of the simply supported beam edge beam 2a on both sides There is a gap 8 between them;

D. After the construction of the simply supported beams on both sides, the second batch of prestressed steel tendons of the tensioned cover beam (the second batch of prestressed steel tendons include the second steel tendons N2, the third steel tendons N3, and the fourth steel tendons arranged in a staggered manner) N4, and the fifth steel beam N5);

E. According to the design plan, carry out bridge deck continuous or expansion joint construction treatment on the gap 8 mentioned in C.

In the description of the present invention, it should be explained that the terms "upper", "lower", "both sides", "side", "along the bridge direction", "horizontal bridge direction", "height direction", "top", The orientations or relative positional relationships indicated by "bottom" are all based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the structure of the present invention and simplifying the description, rather than indicating or implying that the referred devices or elements must have specific orientation and therefore should not be construed as limiting the invention.

Although the above content describes the specific implementation of the present invention, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (6)

1. a kind of half stealth of falling T bent cap construction, it is characterised in that in two sides, simply supported beam is shelved on inverted T-shaped bent cap, in simply supported beam The upper limb at beam both ends is arranged along bridge to bracket, and two sides are located above the bent cap atop part of falling T along bridge to bracket, and direction across bridge bent cap falls T is extended partially into away from bent cap end certain distance, forms direction across bridge bracket in bent cap direction across bridge end, so that two sides side bar can be with Not by the interval for the part of falling T；In suitable bridge to for the suitable bridge of two sides simply supported beam central sill to gap is equipped between bracket end face, two sides are simple Strutbeam side bar passes through from the bent cap part of falling T two sides, gap is equipped between end face, gap described above is continuous by bridge floor or stretches Contracting seam construction is handled；At left and right sides of being located at along bridge to, bent cap fall T part between simply supported beam, in direction across bridge, bent cap falls T Part is between the side bar of two sides, and in short transverse, the bent cap part of falling T is located at the suitable bridge of central sill to bracket lower section, so that bent cap The part of falling T is blocked by two sides simply supported beam in three above direction, reaches stealthy effect.

2. half stealth of falling T bent cap construction as described in claim 1, which is characterized in that be arranged forever on the bracket of inverted T-shaped bent cap two sides Long support, for shelving two sides simply supported beam.

3. half stealth of falling T bent cap construction as described in claim 1, which is characterized in that in suitable bridge to beam-ends in the simply supported beam of two sides Portion i.e. along bridge between bracket root and the bent cap part of falling T be equipped with gap；In direction across bridge, simply supported beam side bar side and bent cap fall T Gap is equipped between surface, in short transverse, suitable the bridge of simply supported beam central sill to bracket bottom and the bent cap atop part of falling T it Between be equipped with gap；Gap described above is not required to carry out bridge floor continuously or expansion joint structure is handled.

4. half stealth of falling T bent cap construction as described in claim 1, which is characterized in that the cross of half stealth of falling T bent cap lateral ends Bridge is configured to crucial force part to bracket, prestressed strand at the direction across bridge bracket under the curved shearing resistance energy to effectively improve bracket Power.

5. half stealth of falling T bent cap construction as claimed in claim 4, which is characterized in that prestressed strand is extended to bent cap side The one end in face is set as stretching end, and the one end for extending to bent cap bottom surface is set as fixing end, avoids and carries out in advance in bent cap bottom The tensioning of stress steel beam and sealing off and covering anchorage construction, reduce difficulty of construction.

6. a kind of construction method of half stealth of falling T bent cap construction, comprising the following steps:

A, half inverted T-shaped bent cap concrete segment of half inverted T-shaped bent cap concrete or installation is poured；

B, first prestressed strand of tensioning bent cap；

C, central sill and side bar are lifted；Two sides simply supported beam is shelved on inverted T-shaped bent cap by support, and central sill is arranged along bridge to bracket, Two sides central sill is located above the bent cap atop part of falling T along bridge to bracket, in suitable bridge to two sides central sill is along bridge between bracket end face Equipped with gap, gap is equipped between the simply supported beam side bar end face of two sides；

D, tensioning bent cap second batch prestressed strand；

E, bridge floor is carried out continuously to gap described in C according to design scheme or expansion joint structure is handled.