CN212843429U

CN212843429U - Device for rapidly measuring arching value of prestressed beam slab

Info

Publication number: CN212843429U
Application number: CN202022349639.4U
Authority: CN
Inventors: 洪涛; 李鹏举; 陈冬冬; 贺冬冬; 徐铜鑫; 张苯
Original assignee: Sinosteel Nanjing New Material Research Institute Co Ltd; Sinosteel Zhengzhou Research Institute of Steel Wire Products Co Ltd
Current assignee: Sinosteel Nanjing New Material Research Institute Co Ltd; Sinosteel Zhengzhou Research Institute of Steel Wire Products Co Ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-03-30
Anticipated expiration: 2030-10-21

Abstract

The utility model discloses a device of arch value on quick measurement prestressed beam slab relates to measuring device's technical field. The device consists of a laser pen, an organic glass light target and three same T-shaped buckles; the three T-shaped buckles are respectively arranged on two end supporting points and a mid-span point of a right-angle corner surface formed by the intersection of a bottom plate surface and a web plate surface on one side in the prestressed beam plate in an inverted mode, the inner side right-angle corners of the three T-shaped buckles are buckled on the right-angle corner surface in a buckled mode, a laser pen is installed at the end point of the T-shaped buckle horizontal extending end of one end supporting point, an organic glass light target is installed at the end point of the T-shaped buckle horizontal extending end of the other end supporting point, the laser point of the laser pen is collinear with the center hole of the organic glass light target, and the end point of the T-shaped buckle horizontal extending end located on the mid. Utilize the utility model discloses can measure the last hunch value of prestressed beam slab fast accurately, have efficient, accurate, simple structure, convenient operation, advantage with low costs as a result.

Description

Device for rapidly measuring arching value of prestressed beam slab

Technical Field

The utility model relates to a measuring device's technical field, more specifically say a device of arch value on quick measurement prestressed beam slab.

Background

The fabricated prestressed concrete beam slab bridge has the advantages of simple structure and convenient construction, and is widely applied to the infrastructure of roads and railways in China. The prestressed precast beam slab generates two parts of camber, namely tensioned camber and dead-weight deflection immediately after being tensioned, the dead-weight deflection is much smaller than the tensioned camber, and the actual camber of the beam body span after the two parts of camber are offset is called elastic camber. Because the tension upper camber and the dead weight lower camber can be calculated by a structural mechanics formula of an elasticity theory, the elasticity upper camber can also be obtained by calculation. However, another precalculated creep upper degree exists in the actual use process after tensioning, namely, if the tensioned precast beam slab is still subjected to prestress, the creep upper degree of camber can be generated along with the time delay. Therefore, the camber value of the prestressed beam slab is synthesized by two parts of elastic camber and creep camber, namely, the camber value of the prestressed beam slab corresponding to any section after tensioning is changed, different and inaccurate to calculate, so that the camber value of the prestressed beam slab can be measured only by a testing device.

The instrument for measuring the arching value of the prestressed beam slab commonly used at present is a level gauge, and has the defects that: the instrument has high cost, troublesome operation, great measurement difficulty, low measurement efficiency and great deviation of measurement results. The corresponding measurement mode is that a point is arranged at the top of the beam before tensioning, the elevation of the point before and after tensioning is measured through a level gauge, and the elevation difference of the point before and after tensioning, namely the upper arch value of the prestressed beam slab, is obtained through calculation, so that the operation is troublesome, the measurement difficulty is high, and the measurement efficiency is low; the points set on the precast beam plate are easy to lose under the influence of natural environment factors, so that the deviation of the measuring result is not accurate enough, and the engineering construction quality is further influenced.

For example, the chinese utility model patent with publication number CN 203605895U discloses a "secondary tension inverted arch value measuring tool for prestressed box girder" -mainly composed of a reference frame and a measuring ruler. The limitation of this anti-camber value measuring tool is: the device is required to be placed at the bottom of a beam before tensioning, is only used for the instantaneous upwarp value of the secondary tensioning of a single beam, cannot be used for creep upwarp measurement, and is low in efficiency.

In summary, at present, there is no device particularly suitable for rapidly and accurately measuring the arching value of the prestressed beam slab, so a special testing device with simple structure, convenient operation and low cost is urgently needed to be designed to efficiently and accurately measure the arching value of the prestressed beam slab.

Disclosure of Invention

The utility model aims at providing a device of arch value on the quick measurement prestressed beam slab to the weak point that exists among the above-mentioned prior art exactly. Utilize the utility model discloses can measure the last hunch value of prestressed beam slab fast accurately, have efficient, accurate, simple structure, convenient operation, advantage with low costs as a result.

The purpose of the utility model can be realized by the following technical measures:

the utility model discloses a device for rapidly measuring the upwarp value of a prestressed beam slab, which consists of a laser pen, an organic glass light target and three same T-shaped buckles; the three T-shaped buckles are respectively arranged on two end supporting points and a mid-span point of a right-angle corner surface formed by the intersection of a bottom plate surface and a web plate surface on one side in the prestressed beam plate in an inverted mode, the inner side right corners of the three T-shaped buckles are buckled on the right-angle corner surface (the three T-shaped buckles are positioned in the same vertical surface and provide the same installation base surface for a laser pen, an organic glass light target and a mid-span upper value supply test point), the laser pen is installed at the end point of the horizontally extending end of the T-shaped buckle at one end supporting point, the organic glass light target is installed at the end point of the horizontally extending end of the T-shaped buckle at the other end supporting point (the laser pen and the organic glass light target which are installed at the same position of the T-shaped buckle are positioned in the same vertical surface), and the laser point of the laser pen is collinear with the central hole of the organic glass light target (thus, a laser line is formed), the end point of the horizontal extending end of the T-shaped buckle positioned at the middle-span point is a mid-span upper value-supplying test point (the upper arch value H1 of the prestressed beam slab corresponding to the test time after tensioning can be quickly measured only by testing the vertical distance between the mid-span upper value-supplying test point at the end point of the horizontal extending end of the T-shaped buckle positioned at the middle-span point and the laser line, and then the upper arch value H0 is subtracted from the upper arch value H0, and the obtained difference value is the upper arch value generated in the period of time)).

The utility model discloses in the adjustable throw point laser pen that the laser pen can be adjusted for the throw point (can conveniently adjust the centre bore that the laser that sends from the laser point of laser pen runs through organic glass light target smoothly).

The working principle of the utility model is as follows:

the utility model discloses only need detain the upwarp value that just can accurately measure prestressed beam board fast with the help of laser pen, organic glass light target and three the same T type, simple structure, with low costs. The working principle is that three T-shaped buckles 1 are inversely buckled on two end supporting points and a mid-span point of a right-angle corner surface formed by the intersection of a bottom plate surface and a web plate surface on one side in a prestressed beam slab, the three T-shaped buckles have the same installation base surface and are positioned in the same vertical surface, the laser pen, the organic glass light target and the mid-span upper value-supply test point which are arranged at the same position of the T-shaped buckle are naturally positioned in the same vertical surface, when the laser emitted by the laser point of the laser pen is adjusted to penetrate through the central hole of the organic glass light target and form a laser line, the vertical distance between the mid-span upper supply value test point at the end point of the horizontal overhanging end of the T-shaped buckle at the mid-span point and the laser line is only tested, the arch value H1 of the prestressed beam slab corresponding to the test moment after tensioning can be quickly measured, the difference value is subtracted from the vertical distance H0 before tensioning, and the obtained difference value is the arch value generated in the period of time.

The utility model has the advantages of as follows:

utilize the utility model discloses can measure the last hunch value of prestressed beam slab fast accurately, have efficient, accurate, simple structure, convenient operation, advantage with low costs as a result.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Part number in the figures illustrates: 1. t-shaped buckle, 2, laser pen, 3, organic glass light target, 4, midspan upper value-supply test point, 5, laser line, H₁And the upwarp value H of the prestressed beam slab corresponding to the test time₀And the vertical distance from the stretching position before stretching.

Detailed Description

The utility model is further described with the following figures:

as shown in fig. 1, the device for rapidly measuring the arching value of the prestressed beam slab of the utility model consists of a laser pen, an organic glass light target and three same T-shaped buckles 1; the three T-shaped buckles 1 are respectively inverted at two end fulcrums and a mid-span point of a right-angle corner surface formed by a bottom plate surface and a web surface on one side in the prestressed beam plate, the inner side straight corners of the three T-shaped buckles 1 are buckled on the right-angle corner surface (the three T-shaped buckles are positioned in the same vertical surface and provide the same installation base surface for a laser pen 2, an organic glass light target 3 and a mid-span upper supply test point 4), the laser pen 2 is installed at the end point of the T-shaped buckle horizontally extending end of one end fulcrum, the organic glass light target 3 is installed at the end point of the T-shaped buckle horizontally extending end of the other end fulcrum (the laser pen 2 and the organic glass light target 3 which are installed at the same position of the T-shaped buckle are positioned in the same vertical surface), and the laser of the laser pen 2 and the center hole of the organic glass light target 3 are collinear (so that the laser emitted from the laser point of the laser pen 2 penetrates through, and a laser line 5 is formed), the end point of the horizontal overhanging end of the T-shaped buckle positioned at the middle-span point is a mid-span upper value-supplying test point 4 (only the vertical distance between the mid-span upper value-supplying test point 4 positioned at the end point of the horizontal overhanging end of the T-shaped buckle positioned at the middle-span point and the laser line 5 is tested, the upper arch value H1 of the prestressed beam slab corresponding to the test moment after tensioning can be quickly tested, and then the difference is subtracted from the vertical distance H0 before tensioning, and the obtained difference is the upper arch value generated in the period of time).

The utility model discloses in the adjustable throw point laser pen that laser pen 2 can be adjusted for the throw point (can conveniently adjust the centre bore that the laser that sends from the laser point of laser pen 2 runs through organic glass light target 3 smoothly).

The utility model discloses a concrete in service behavior as follows:

firstly, inverting three T-shaped buckles 1 in a prestressed beam slab to form two end supporting points and a mid-span point of a right-angle corner surface formed by intersecting a bottom plate surface and a web plate surface on one side, and clamping the inner side right corners of the three T-shaped buckles 1 on the right-angle corner surface to ensure that the three T-shaped buckles are positioned in the same vertical surface and provide the same installation base surface for a laser pen 2, an organic glass light target 3 and a mid-span upper supply value test point 4; then, a laser pen 2 is installed at the end point of the horizontal extending end of the T-shaped buckle at one end fulcrum, and an organic glass light target 3 is installed at the end point of the horizontal extending end of the T-shaped buckle at the other end fulcrum, so that the laser pen 2 and the organic glass light target 3 which are installed at the same position of the T-shaped buckle are ensured to be positioned in the same vertical plane; then, adjusting the laser point of the laser pen 2 to be collinear with the central hole of the organic glass light target 3, and ensuring that a laser line emitted from the laser point of the laser pen 2 penetrates through the central hole of the organic glass light target 3 to form a laser line 5; then, taking the end point of the horizontal overhanging end of the T-shaped buckle at the mid-span point as a mid-span upper supply value test point 4, and measuring the vertical distance from the mid-span upper supply value test point 4 to the laser line 5, so as to quickly measure the upwarp value H1 of the prestressed beam slab corresponding to the test time after tensioning; and finally, subtracting the vertical distance H0 before tensioning from the arch camber H1 of the prestressed beam slab corresponding to the testing moment after tensioning again, wherein the obtained difference is the arch camber generated in the period of time.

Claims

1. The utility model provides a device of quick measurement prestressing force roof beam board upwarp value which characterized in that: the device consists of a laser pen, an organic glass light target and three same T-shaped buckles (1); the three T-shaped buckles (1) are respectively arranged on two end fulcrums and a mid-span point of a right-angle corner surface formed by the intersection of a bottom plate surface and a web plate surface on one side in the prestressed beam plate in an inverted mode, the inner side right-angle corners of the three T-shaped buckles (1) are buckled on the right-angle corner surface, a laser pen (2) is installed at the end point of the horizontally extending end of the T-shaped buckle at one end fulcrum, an organic glass light target (3) is installed at the end point of the horizontally extending end of the T-shaped buckle at the other end fulcrum, the laser point of the laser pen (2) is collinear with the center hole of the organic glass light target (3), and the end point of the horizontally extending end of the T-shaped buckle located at the mid.

2. The apparatus for rapidly measuring the camber value of the prestressed girder according to claim 1, wherein: the laser pen (2) is an adjustable pointing laser pen with adjustable pointing.