CN-116604684-B - Prestressed self-locking precast concrete small box girder internal mold

CN116604684BCN 116604684 BCN116604684 BCN 116604684BCN-116604684-B

Abstract

The invention discloses a prestressed self-locking precast concrete small box girder internal mold which comprises at least two girder body sections which are sequentially arranged, wherein central shafts of the two girder body sections are overlapped, 4 mounting channels are arranged in each girder body section and are respectively arranged in four corners of a longitudinal section of the girder body section, one sides, close to each other, of two adjacent girder body sections are connected through a plurality of conical pin shafts and conical pin sleeves, for each mounting channel, a prestressed tendon is arranged in each mounting channel in a penetrating manner, one end of the prestressed tendon is fixedly connected with one end of the girder body section spliced together through a fixing piece, the other end of the prestressed tendon is fixedly connected with a threaded steel connecting rod in a coaxial manner through a connecting rod connector, the threaded steel connecting rod penetrates out of the other end of the girder body section spliced together, and a nut is connected onto the threaded steel connecting rod in a threaded manner. The concrete small box girder inner mold can be assembled and disassembled quickly, construction personnel are not required to enter the small box girder for internal construction, and the safety and the construction efficiency of the small box girder construction are improved.

Inventors

ZHANG YAOSHENG
XIAO RONG
WEI MINGGUANG
CUI WEI
ZHANG CHUNLEI
LI ENLIANG
ZHANG XUCHANG
SHI JUN
YANG ZHIGANG
ZHU LINSHENG

Assignees

上海市政工程设计研究总院（集团）有限公司
上海市政预制技术开发有限公司

Dates

Publication Date: 20260508
Application Date: 20230612

Claims (10)

1. The prestress self-locking type precast concrete small box girder internal mold is characterized by comprising at least two girder body sections which are sequentially arranged, wherein central axes of the two girder body sections are coincident, 4 mounting channels are arranged in each girder body section and are respectively arranged in four corners of the longitudinal section of the girder body section; The beam body section comprises a beam body section, a plurality of conical pin shafts, a plurality of conical pin sleeves, a plurality of connecting rods and a plurality of connecting rods, wherein the conical pin shafts and the conical pin sleeves are in one-to-one correspondence; The device also comprises prestress installation components, wherein the number of the prestress installation components is matched with that of the installation channels, and each prestress installation component comprises a prestress rib, a screw steel connecting rod, a connecting rod connector, a fixing piece, a backing plate and a nut; For each installation channel, the prestress rib is arranged in the installation channel in a penetrating mode, one end of the prestress rib is fixedly connected with one end of the beam body section which is spliced together through the fixing piece, the other end of the prestress rib is fixedly connected with the threaded steel connecting rod in a coaxial mode through the connecting rod connector, the threaded steel connecting rod penetrates out of the other end of the beam body section which is spliced together, the nut is connected onto the threaded steel connecting rod in a threaded mode, and the base plate is located between the other end of the beam body section which is spliced together and the nut.
2. The concrete trabecula girder inner mold of claim 1, wherein the mounting channels are one of a straight line channel, a broken line channel or a curved line channel after being communicated with each other.
3. The concrete trabecular girder internal mold of claim 1, wherein each of the girder body segments includes a left half mold and a right half mold; The top wall of the left half die and the top wall of the right half die are spliced to form the top wall of the beam body section, the bottom wall of the left half die and the bottom wall of the right half die are spliced to form the bottom wall of the beam body section, and the side wall of the left half die and the side wall of the right half die are respectively two side walls of the beam body section.
4. A concrete small box girder inner mould according to claim 3, wherein the joints of the top wall of the girder body section and the joints of the bottom wall of the girder body section are arranged in an acute angle staggered manner with the central axis of the girder body section.
5. A concrete trabecular girder internal mold according to claim 3 or 4, wherein the positions of the seams of the top walls of adjacent two of said girder body sections are staggered; The positions of the joints of the bottom walls of the adjacent two beam body sections are staggered.
6. A concrete trabecula girder inner mould according to claim 3, wherein the junction of the left half mould and the right half mould is a bevel.
7. A concrete trabecula girder inner mould according to claim 3, wherein the left half mould comprises an upper connecting block, a lower connecting block, a hinge shaft and a stretching and closing force transmission mechanism; The upper connecting block comprises an upper area of the side wall of the left half die and a top wall of the left half die, the lower connecting block comprises a lower area of the side wall of the left half die and a bottom wall of the left half die, and the upper connecting block and the lower connecting block are connected through the hinge shaft; the opening and closing force transmission mechanism is connected with the upper connecting block and the lower connecting block and is used for controlling the upper connecting block and the lower connecting block to be supported or loosened.
8. The concrete trabecular girder internal mold of claim 7, wherein the right half mold is identical in structure to the left half mold.
9. The concrete trabecula girder internal mold of claim 7, wherein the opening and closing force transmission mechanism comprises a longitudinal pull rod, a power crank, a power rotating shaft, a rotating shaft seat, a connecting rod rotating shaft, a connecting rod and a safety pin; the longitudinal pull rod is arranged between the upper connecting block and the lower connecting block and is arranged along the long side direction of the upper connecting block; the connecting rod rotating shafts are multiple and are arranged at intervals on one side, close to each other, of the upper connecting block and the lower connecting block; The connecting rods are in one-to-one correspondence with the connecting rod rotating shafts, one end of each connecting rod is rotationally connected with the connecting rod rotating shaft, and the other end of each connecting rod is rotationally connected with the longitudinal pull rod; a connecting plate is arranged on one side, close to the upper connecting block, of the lower connecting block, an arc-shaped chute is formed in the connecting plate, and the arc center angle of the arc-shaped chute faces the lower connecting block; The rotating shaft seat is fixed on one side of the lower connecting block, which is close to the upper connecting block, one end of the power rotating shaft is rotationally connected with the rotating shaft seat, the other end of the power rotating shaft is rotationally connected with the power crank, and the other end of the power crank is slidingly connected to the arc-shaped chute; The safety pin is arranged on any connecting rod at the end part of the left half die.
10. The concrete trabecula girder inner mold of claim 1, wherein a plurality of lifting holes are provided in a top wall of the girder body section.

Description

Prestressed self-locking precast concrete small box girder internal mold Technical Field The invention relates to the technical field of bridge building templates, in particular to a prestressed self-locking precast concrete small box girder inner die. Background Along with the rapid development of municipal highway bridge construction in China, the prefabricated small box girder is widely applied with the characteristics of high bearing capacity, high rigidity, economy, practicability and the like. The inside of the prefabricated small box girder is hollow, and is needed to be molded by means of an inner template. The limit of the height and the space in the small box girder brings certain difficulty to the design, the manufacture, the installation and the disassembly of the internal mold. The traditional internal mold is usually designed and manufactured into a plurality of small plates according to the local structures and then assembled and assembled. Most of the current concrete box girder internal molds are spliced templates, which are formed by splicing a plurality of small steel templates. Generally, the hoisting, assembling and fixing are carried out by manpower and machinery, each template is connected by bolts, and a plurality of supports are arranged inside the templates. When the form removal, the constructor is required to enter the box girder, all bolts and supporting rods are removed, the inner mold is disassembled, then the inner mold can be moved out block by block, and the inner mold is assembled block by block when in use, so that the labor intensity is increased, the production cost is increased, a lot of inconvenience is brought to the constructor, the deformation of the template is easily caused, and the appearance quality of the concrete is influenced. Disclosure of Invention The invention provides a prestressed self-locking precast concrete small box girder inner mold, which can realize rapid assembly and disassembly without entering the small box girder for construction by constructors, and improves the safety and the construction efficiency of the small box girder construction. In order to achieve the above purpose, the invention adopts the following technical scheme: the invention provides a prestressed self-locking precast concrete small box girder internal mold, which comprises at least two girder body sections which are sequentially arranged, wherein central axes of the two girder body sections are coincident, 4 mounting channels are arranged in each girder body section, and the four mounting channels are respectively arranged in four corners of a longitudinal section of the girder body section; The beam body section comprises a beam body section, a plurality of conical pin shafts, a plurality of conical pin sleeves, a plurality of connecting rods and a plurality of connecting rods, wherein the conical pin shafts and the conical pin sleeves are in one-to-one correspondence; The device also comprises prestress installation components, wherein the number of the prestress installation components is matched with that of the installation channels, and each prestress installation component comprises a prestress rib, a screw steel connecting rod, a connecting rod connector, a fixing piece, a backing plate and a nut; For each installation channel, the prestress rib is arranged in the installation channel in a penetrating mode, one end of the prestress rib is fixedly connected with one end of the beam body section which is spliced together through the fixing piece, the other end of the prestress rib is fixedly connected with the threaded steel connecting rod in a coaxial mode through the connecting rod connector, the threaded steel connecting rod penetrates out of the other end of the beam body section which is spliced together, the nut is connected onto the threaded steel connecting rod in a threaded mode, and the base plate is located between the other end of the beam body section which is spliced together and the nut. In one possible implementation, the mounting channels are in communication with each other and then are one of a straight channel, a broken line channel or a curved channel. In one possible implementation, each of the beam body sections includes a left half mold and a right half mold; The top wall of the left half die and the top wall of the right half die are spliced to form the top wall of the beam body section, the bottom wall of the left half die and the bottom wall of the right half die are spliced to form the bottom wall of the beam body section, and the side wall of the left half die and the side wall of the right half die are respectively two side walls of the beam body section. In one possible implementation, the seam of the top wall of the beam section and the seam of the bottom wall of the beam section are each disposed at an acute angle to the central axis of the beam section. In one possible implementation, the seam of the top walls of two adjacent beam bo