CN219972914U - Precast beam body and precast bent cap - Google Patents

Abstract

The utility model discloses a precast beam body and a precast capping beam, which comprise precast concrete blocks, forward connecting rib rows and first shear key teeth, wherein the first shear key teeth are respectively arranged at the two transverse ends of the precast concrete blocks, the first shear key teeth are protruded out of the end faces of the precast concrete blocks and are arranged on the precast concrete blocks, the forward connecting ribs are protruded out of the inner wall faces of the precast concrete blocks, and first prestress holes which are arranged along the transverse bridge direction are reserved in the precast concrete blocks. The prefabricated beam body is formed by connecting the two prefabricated beam bodies when the middle bent cap is applied on site, so that the technical problem that the whole bent cap is difficult to apply due to the limitation of the existing transportation along the road and the on-site hoisting condition due to the heavy weight of the existing bent cap component is avoided.

Description

Precast beam body and precast bent cap

Technical Field

The utility model relates to the technical field of bridge prefabrication and assembly, in particular to a precast beam body and a precast cap beam.

Background

In order to meet the requirements of green and environment-friendly construction and rapid construction of urban bridge construction in recent years, the technology of precast beams is rapidly developed. The main process of the precast beam body is factory prefabrication, component transportation and field hoisting and is applied to a pouring pile foundation and a bearing platform.

The capping beam is used as a force transfer member between the upper and lower bridge structures, and the construction size of the capping beam is related to the bridge width, the span and the pier column spacing. For a conventional 30 m-span viaduct, a cover beam of an integral pier is adopted in a bidirectional 6-lane, the transverse width of the bridge exceeds 30m, the weight reaches 400-450 t, and the weight of the cover beam is even larger at the positions of the overpass ramp underpants and the road crossing openings and is limited by the conditions of road transportation along the line and on-site hoisting, and the weight of a prefabricated part (the cover beam) needs to be controlled.

In view of this, it is necessary to propose a precast beam segment by which a precast cap beam is formed by assembly to solve or at least alleviate the defect that the existing cap beam member is large in mass and difficult to construct.

Disclosure of Invention

The utility model mainly aims to provide a precast beam body and a precast bent cap, and aims to solve the technical problem that the existing bent cap component is large in mass and difficult to construct.

In order to achieve the above purpose, the utility model provides a precast beam body, which comprises precast concrete blocks, forward connecting ribs and first shear key teeth, wherein the first shear key teeth are respectively arranged at the two transverse ends of the precast concrete blocks, the first shear key teeth are arranged to protrude out of the end surfaces of the precast concrete blocks, the forward connecting ribs are arranged on the precast concrete blocks and protrude out of the inner wall surfaces of the precast concrete blocks, and first prestress holes which are arranged along the transverse bridge direction are reserved in the precast concrete blocks.

Further, the precast concrete piece includes precast beam body, precast beam bottom and precast beam wall, the bottom edge position of precast beam body is located along the internal face of perpendicular to precast beam body at the precast beam bottom, two precast beam walls locate the both ends of precast beam body relatively and are connected with the precast beam bottom of corresponding position department, precast beam wall and precast beam bottom parallel and level are laid, be equipped with first shear key tooth on the precast beam wall keeps away from the one end terminal surface of precast beam body, the forward direction tie bar is arranged and is located precast beam body and protrusion in the internal face setting of precast beam body, first prestressing force hole runs through along the cross bridge to laying.

Further, forward connecting rib rows are respectively arranged at the upper edge position and the lower edge position of the precast concrete block.

Further, the forward connecting rib row comprises a plurality of embedded forward connecting ribs which are distributed at intervals along the transverse bridge, the first ends of the embedded forward connecting ribs are embedded in the precast concrete blocks, and the second ends of the embedded forward connecting ribs extend outwards and protrude out of the inner wall surface of the precast concrete blocks.

Further, the embedded forward connecting rib is a u-shaped rib, the opening end of the embedded forward connecting rib is embedded in the precast concrete block, and the closed end of the embedded forward connecting rib protrudes out of the inner wall surface of the precast concrete block.

Further, the first shear key teeth extend along the forward bridge direction, and the plurality of first shear key teeth are arranged at intervals along the vertical direction.

Further, the prestressed holes are arranged on the precast concrete blocks at intervals.

The utility model also provides a prefabricated bent cap, which comprises a middle bent cap and cantilever bent caps, wherein the two cantilever bent caps are oppositely arranged at two ends of the middle bent cap along the transverse bridge direction and are tensioned by post-tensioning prestressed tendons, and the middle bent cap is formed by two prefabricated beam bodies distributed along the forward bridge direction through a non-passing high-humidity joint.

Further, a second pre-stressing hole distributed along the transverse bridge direction is formed in the cantilever bent cap, and the post-tensioning pre-stressing tendons penetrate through the first pre-stressing hole and the second pre-stressing hole along the transverse bridge direction.

Further, the cantilever bent cap is connected with the middle bent cap through a dry joint, the end face of one end, close to the middle bent cap, of the cantilever bent cap is provided with second shear key teeth protruding out of the end face of the cantilever bent cap, the second shear key teeth are arranged along the forward bridge direction, a plurality of second shear key teeth are arranged at intervals along the height direction, and the second key tooth shear key teeth of the cantilever bent cap and the first shear key teeth of the corresponding middle bent cap are arranged in a staggered mode along the height direction.

Compared with the prior art, the precast beam body provided by the utility model has the following beneficial effects:

the precast beam body comprises precast concrete blocks, forward connecting rib rows and first shear key teeth, wherein the forward connecting ribs are arranged on the precast concrete blocks and protrude out of the inner wall surfaces of the precast concrete blocks, so that the two precast concrete blocks along the forward bridge direction are conveniently connected to form a middle bent cap, and the first shear key teeth protrude out of the end surfaces of the precast concrete blocks, so that the middle bent cap and the cantilever bent cap are conveniently connected along the transverse bridge direction to finally form the precast bent cap; the prefabricated beam body and the cantilever bent cap are applied on site to form the prefabricated bent cap, so that the technical problem that the existing bent cap is difficult to apply to the whole bent cap due to the fact that the existing bent cap is heavy in weight and limited by road transportation along the line and on-site hoisting conditions is avoided.

Drawings

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

FIG. 1 is a schematic perspective view of a precast beam body according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a prefabricated capping beam in one embodiment of the present utility model;

fig. 3 is a schematic structural view of a prefabricated capping beam in an embodiment of the present utility model.

Legend description:

10. prefabricating a beam body; 11. prefabricating concrete blocks; 111. prefabricating a beam body; 112. prefabricating a beam bottom; 113. prefabricating a beam wall; 12. a forward connecting rib row; 13. a first shear key tooth; 20. a cantilever capping beam; 21. and the second shear key teeth.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1, 2 and 3, the present utility model provides a precast beam 10, which includes a precast concrete block 11, a forward connecting rib row 12 and first shear key teeth 13, wherein the first shear key teeth 13 are respectively disposed at two lateral ends of the precast concrete block 11, the first shear key teeth 13 protrude from an end surface of the precast concrete block 11, the forward connecting rib row 12 is disposed on the precast concrete block 11 and protrudes from an inner wall surface of the precast concrete block 11, and first pre-stressing holes disposed along a transverse bridge direction are reserved in the precast concrete block 11.

The precast beam body 10 provided by the utility model comprises precast concrete blocks 11, forward connecting rib rows 12 and first shear key teeth 13, wherein the forward connecting rib rows 12 are arranged on the precast concrete blocks 11 and protrude out of the inner wall surfaces of the precast concrete blocks 11, so that the two precast concrete blocks 11 along the forward bridge direction are conveniently connected to form a middle bent cap, and the first shear key teeth 13 protrude out of the end surfaces of the precast concrete blocks 11, so that the middle bent cap and the cantilever bent cap 20 are conveniently connected along the transverse bridge direction to finally form the precast bent cap; the prefabricated beam body 10 and the cantilever bent cap 20 are applied on site to form the prefabricated bent cap, so that the technical problem that the existing bent cap is difficult to apply to the whole bent cap due to the fact that the existing bent cap is heavy in weight and limited by road transportation along the line and on-site hoisting conditions is avoided.

Further, the precast concrete segment 11 includes a precast beam body 111, a precast beam bottom 112 and precast beam walls 113, the precast beam bottom 112 is arranged at the bottom edge position of the precast beam body 111 along the inner wall surface perpendicular to the precast beam body 111, two precast beam walls 113 are oppositely arranged at two ends of the precast beam body 111 and are connected with the precast beam bottom 112 at the corresponding positions, the precast beam walls 113 are arranged flush with the precast beam bottom 112, a first shear key tooth 13 is arranged on the end surface of one end of the precast beam wall 113 far away from the precast beam body 111, a forward connecting rib row 12 is arranged on the precast beam body 111 and protrudes out of the inner wall surface of the precast beam body 111, and a first prestress hole is arranged in a penetrating mode along the transverse bridge direction. It will be appreciated that by providing precast concrete segments 11 comprising precast beam bodies 111, precast beam bottoms 112 and precast beam walls 113, open-top grooves are formed when two precast beam bodies 10 are spliced to form a middle capping beam, thereby facilitating the casting of concrete to form wet joints.

Further, in order to improve the stability of the two joints and the strength of the wet joint, the precast concrete segments 11 are provided with forward joint rib rows 12 at the upper and lower edge positions, respectively.

Further, the forward connecting rib row 12 includes a plurality of embedded forward connecting ribs arranged at intervals along the transverse bridge, the first ends of the embedded forward connecting ribs are embedded in the precast concrete segments 11, and the second ends of the embedded forward connecting ribs extend outwards and protrude out of the inner wall surface of the precast concrete segments 11. It can be understood that the embedded forward connecting ribs can be u-shaped ribs or straight ribs.

Further, the embedded forward connecting ribs are u-shaped ribs, the opening ends of the embedded forward connecting ribs are buried in the precast concrete blocks 11, and the closed ends of the embedded forward connecting ribs are protruded out of the inner wall surfaces of the precast concrete blocks 11. It can be understood that the pre-buried forward connecting ribs are u-shaped ribs, and the pre-buried forward connecting ribs which are oppositely arranged after the two precast beam bodies 10 are oppositely arranged form a whole ring structure, so that the main ribs are conveniently arranged in the whole ring structure.

Further, in order to improve the connection strength, the first shear key teeth 13 extend along the forward bridge direction, and the plurality of first shear key teeth 13 are arranged at intervals vertically.

Further, in order to facilitate the installation of a plurality of post-tensioned tendons, a plurality of pre-tensioned holes are arranged on the precast concrete segments 11 at intervals. The utility model also provides a prefabricated bent cap, which comprises a middle bent cap and cantilever bent caps 20, wherein the two cantilever bent caps 20 are oppositely arranged at two ends of the middle bent cap along the transverse bridge direction and are tensioned by post-tensioning prestressed tendons, and the middle bent cap is formed by two prefabricated beam bodies 10 distributed along the along-bridge direction through non-passing high-humidity joints.

Further, a second pre-stressing hole is formed in the cantilever bent cap 20 and distributed along the transverse bridge direction, and the post-tensioning pre-stressing tendons pass through the first pre-stressing hole and the second pre-stressing hole along the transverse bridge direction.

Further, the cantilever bent cap 20 is connected with the middle bent cap through a dry joint, the end face of the cantilever bent cap 20, which is close to one end of the middle bent cap, is provided with second shear key teeth 21 protruding out of the end face of the cantilever bent cap, the second shear key teeth 21 are arranged along the forward bridge direction, a plurality of second shear key teeth 21 are arranged at intervals along the height direction, and the second key tooth shear key teeth of the cantilever bent cap 20 and the first shear key teeth 13 of the corresponding middle bent cap are arranged in a staggered manner along the height direction.

Specifically, the prefabricated bent cap comprises a middle bent cap and cantilever bent caps 20, the two cantilever bent caps 20 are oppositely arranged at two ends of the middle bent cap along the transverse bridge direction and are tensioned by post-tensioned prestressing tendons, the two ends of the middle bent cap are respectively provided with first shear key teeth 13 protruding out of the end faces of the first shear key teeth 13, the first shear key teeth 13 are arranged along the transverse bridge direction, a plurality of first shear key teeth 13 are arranged at intervals along the height direction, the end face of the cantilever bent cap 20 close to one end of the middle bent cap is provided with second shear key teeth 21 protruding out of the end faces of the cantilever bent caps, the second shear key teeth 21 are arranged along the transverse bridge direction, the plurality of second shear key teeth 21 are arranged at intervals along the height direction, the second shear key teeth of the cantilever bent caps 20 are staggered with the corresponding first shear key teeth 13 of the middle bent cap along the height direction and are connected by dry seams, the post-tensioned prestressing tendons are tensioned on the cantilever bent caps 20 and the middle bent cap along the transverse bridge direction, the middle bent cap comprises two precast beam pieces spliced along the forward direction of the bridge, each precast beam piece comprises a precast concrete block 11 and pre-buried forward connecting ribs, the transverse two ends of the precast concrete block 11 are respectively provided with a first shear key tooth 13, the pre-buried forward connecting ribs are arranged on the precast concrete block 11 and protrude out of the inner wall surface of the precast concrete block 11, a first pre-stressing hole distributed along the transverse direction is reserved in the precast concrete block 11, the two precast beam pieces are oppositely arranged at the top of the supporting column along the forward direction of the bridge and are spliced to form a body primary blank, the middle part of the body primary blank is provided with an opening groove distributed along the transverse direction of the bridge and provided with an opening, the bottom splicing seam and the transverse end splicing seam of the body primary blank are blocked by a sealing body, a longitudinal wet seam is formed by pouring in the opening groove so as to connect the two precast beam pieces to form a whole beam structure, a second pre-stressing hole distributed along the transverse direction of the bridge is arranged in the cantilever bent cap 20, the post-tensioned prestressing tendons pass through the first prestressing holes and the second prestressing holes along the transverse bridge direction. The middle bent cap and the cantilever bent cap 20 are matched through the first shear key teeth 13 and the second shear key teeth 21 and are connected into a whole under the action of the dry joint seam and the prestressed tendons, so that the load transmitted by the upper structure of the bridge is jointly born, the field wet operation is reduced, the construction is convenient and quick, and the shearing capacity of the dry joint seam is improved; the middle bent cap comprises two precast beam pieces spliced along the forward direction of the bridge, the precast beam pieces comprise precast concrete blocks 11 and embedded forward direction connecting ribs, the two precast beam pieces are oppositely arranged at the top of the supporting column along the forward direction of the bridge and are spliced to form a body primary blank, an opening groove which is arranged along the transverse direction of the bridge and is open at the top is formed in the middle of the body primary blank, the bottom splicing seam and the transverse end splicing seam of the body primary blank are plugged through sealing bodies, longitudinal wet seams are formed in the opening groove in a pouring mode, the two precast beam pieces are connected to form a whole beam structure, when the middle bent cap is applied on site, a bottom die is not required to be applied at the bottom of the body primary blank, a side die is not required to be applied at the transverse end of the body primary blank, and the construction process is simple.

As can be appreciated, when two precast beam bodies 10 are oppositely arranged at the top of a support column along the bridge direction and spliced to form a body primary blank, the seam width of the bottom splicing seam and the transverse end splicing seam of the body primary blank is about 1 cm, and the precast beam bodies are sealed by adopting epoxy resin glue or grouting material (sealing body) to prevent slurry leakage during pouring of wet seams; the wet seam is formed by casting plain concrete or ultra-high performance concrete into the open groove.

The foregoing description is only of the preferred embodiments of the present utility model, and is not intended to limit the scope of the utility model, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (10)

1. A precast beam body is characterized in that,

including precast concrete piece, forward direction connecting rib row and first shear key tooth, the horizontal both ends of precast concrete piece are equipped with respectively first shear key tooth, first shear key tooth bulge in the terminal surface of precast concrete piece is laid, forward direction connecting rib row locate on the precast concrete piece just bulge in the internal face setting of precast concrete piece, the first prestressing force hole of laying along the horizontal bridge direction is reserved in the precast concrete piece.

2. The preform beam as claimed in claim 1, wherein,

the precast concrete block comprises a precast beam body, a precast beam bottom and precast beam walls, wherein the precast beam bottom is arranged at the edge position of the bottom of the precast beam body along the inner wall surface vertical to the precast beam body, the two precast beam walls are oppositely arranged at the two ends of the precast beam body and are connected with the precast beam bottom at the corresponding positions, the precast beam walls are arranged at the same level with the precast beam bottom, the end surface of one end of the precast beam wall far away from the precast beam body is provided with the first shear key teeth,

the forward connecting ribs are arranged on the precast beam body and protrude out of the inner wall surface of the precast beam body,

the first pre-stressing holes are arranged in a penetrating mode along the transverse bridge direction.

3. The preform beam as claimed in claim 1, wherein,

the upper edge position and the lower edge position of the precast concrete block are respectively provided with the forward connecting rib row.

4. The preform beam as claimed in claim 1, wherein,

the forward connecting rib row comprises a plurality of embedded forward connecting ribs which are distributed along the transverse bridge at intervals, the first ends of the embedded forward connecting ribs are embedded in the precast concrete blocks, and the second ends of the embedded forward connecting ribs extend outwards and protrude out of the inner wall surface of the precast concrete blocks.

5. The preform beam according to claim 4, wherein,

the embedded forward connecting rib is a u-shaped rib, the opening end of the embedded forward connecting rib is embedded in the precast concrete block, and the closed end of the embedded forward connecting rib protrudes out of the inner wall surface of the precast concrete block.

6. The preform beam as claimed in claim 1, wherein,

the first shear key teeth extend along the forward bridge direction, and a plurality of the first shear key teeth are vertically arranged at intervals.

7. The preform beam as claimed in claim 1, wherein,

the prestressed holes are arranged on the precast concrete blocks at intervals.

8. A prefabricated capping beam is characterized in that,

the cantilever bent cap comprises a middle bent cap and a cantilever bent cap, wherein the two cantilever bent caps are oppositely arranged at two ends of the middle bent cap along the transverse bridge direction and are tensioned through post-tensioning prestressed tendons, and the middle bent cap is formed by two precast beam bodies which are arranged along the forward bridge direction and are formed through non-passing high-humidity seams according to any one of claims 1 to 7.

9. The prefabricated capping beam of claim 8 wherein,

and a second pre-stressing hole distributed along the transverse bridge direction is formed in the cantilever bent cap, and the post-tensioning pre-stressing tendon penetrates through the first pre-stressing hole and the second pre-stressing hole along the transverse bridge direction.

10. The prefabricated capping beam of claim 8 wherein,

the cantilever bent cap with the middle part bent cap passes through the dry joint seam to be connected, be equipped with the protrusion on the terminal surface of the one end of cantilever bent cap near the middle part bent cap and lay in its terminal surface second shear key tooth, the second shear key tooth is along following the bridge to setting, a plurality of second shear key teeth are along the direction of height interval arrangement, the cantilever bent cap the second shear key tooth with the first shear key tooth of corresponding middle part bent cap is along the direction of height dislocation arrangement.