CN213239481U - Precast beam static load test device - Google Patents
Precast beam static load test device Download PDFInfo
- Publication number
- CN213239481U CN213239481U CN202022625395.8U CN202022625395U CN213239481U CN 213239481 U CN213239481 U CN 213239481U CN 202022625395 U CN202022625395 U CN 202022625395U CN 213239481 U CN213239481 U CN 213239481U
- Authority
- CN
- China
- Prior art keywords
- loading
- steel
- test
- spliced
- double
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a precast beam static load test device, which belongs to the technical field of bridge static load test; the device comprises a test beam, a loading module, a loading support mechanism and a bottom support structure, wherein the test beam is provided with a top plate facing upwards and a bottom plate facing downwards, the bottom plate of the test beam is connected to the upper end of the bottom support structure, the loading support mechanism is arranged at the upper end of the top plate, and the loading module is connected to the upper end of the loading support mechanism through hoisting equipment; the bottom supporting structure comprises a pedestal, bottom double-spliced I-shaped steel and a rubber support; the loading supporting mechanism comprises a steel plate, a middle double-spliced I-shaped steel and a jack, and the upper end of the jack is connected with the loading module through the steel plate. The utility model discloses a gantry crane hoist and mount replace current common reaction frame mode of exerting pressure, and its atress mode is changed into two point web pressures by general single-point roof pressurized, improves experimental degree of safety, and moves roof beam fast, work efficiency is high, is applicable to the static load test of multi-disc roof beam.
Description
Technical Field
The utility model relates to a bridge static load test device, concretely relates to precast beam static load test device belongs to building bridge static load test technical field.
Background
With the rapid development of highway construction in recent years in China, the bridge construction is increased day by day, and most precast beams need to be subjected to static load tests before being hoisted and installed. The device or the method adopted by the current static load test has the following problems: 1) common static load test loading modes include uniform loading and concentrated loading, and concentrated loading also includes single-point loading, two-point loading and multi-point loading, but the modes are that the top plate of the beam body is pressed at a single point, so that the test safety degree is lower when the loading load is larger, and the test beam body is extremely easy to damage. 2) A common loading means is to install a reaction frame, but the mode has large workload in the early stage, is difficult to move a beam, has long time in the process of assembling and disassembling in a test, and is not suitable for a static load test of a plurality of beams.
Disclosure of Invention
The utility model aims at: the precast beam static load test device has the advantages that the problems that the beam body top plate single-point stress safety degree is low, the test beam body is difficult to replace due to the difficulty in moving the beam, and the like in the existing static load test loading mode and loading means are solved, the existing common reaction frame pressure applying mode is replaced by the gantry crane hoisting, the force applying mode is changed from the common single-point top plate pressure applying mode to the two-point web pressure applying mode, the test safety degree is improved, the beam moving speed is high, the working efficiency is high, and the precast beam static load test device is suitable for static load tests of multiple beams.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a precast beam static load test device comprises a test beam, a loading module, a loading support mechanism and a bottom support structure, wherein the test beam is provided with a top plate facing upwards and a bottom plate facing downwards, the bottom plate of the test beam is connected to the upper end of the bottom support structure, the loading support mechanism is arranged at the upper end of the top plate, and the loading module is connected to the upper end of the loading support mechanism through hoisting equipment; the bottom supporting structure comprises a pedestal, two bottom double-spliced I-beams and a rubber support, the pedestal is arranged on the ground of a test field, the two bottom double-spliced I-beams are arranged in parallel and are respectively positioned at two ends of the upper part of the pedestal, the test beam is arranged in parallel with the pedestal, and two ends of a bottom plate of the test beam are correspondingly connected to the bottom double-spliced I-beams through the rubber support; the loading supporting mechanism comprises a steel plate, a middle double-spliced I-shaped steel and a jack, the top plate and a web plate junction position of the test beam are connected by two steel plates, the two ends of the middle double-spliced I-shaped steel are connected by two steel plates and are located at the middle part of the upper end of the top plate of the test beam, the middle upper end of the middle double-spliced I-shaped steel is connected by the steel plates, and the upper end of the jack is connected by the steel plates to the loading module.
The loading module by with the same load beam of experimental roof beam body the steel sheet with the middle part double-spliced I-steel constitutes, the load beam is roof down, the bottom plate sets up, the roof of load beam is connected two with web juncture position department the steel sheet, middle part double-spliced I-steel upper end is connected and is located two of load beam lower extreme upper and lower end are connected and are located the jack upper end on the steel sheet.
When the test meeting the bearing capacity limit state is carried out, under the condition that the weight of the load required to be loaded is smaller or a scrapped beam exists on the site, the scrapped load beam in the test field is adopted as the load module, the scrapped load beam is arranged with the top plate upward and the bottom plate downward, and the bottom plate of the scrapped load beam is connected to the steel plate at the upper end of the jack.
The bottom double-spliced I-shaped steel is provided with two, every bottom double-spliced I-shaped steel upper end sets up two rubber support, two transverse separation distance between the rubber support is 50 cm.
The bottom double-spliced I-shaped steel and the middle double-spliced I-shaped steel are self-made workpieces and are made by vertically butting the two I-shaped steels and filling concrete in the two I-shaped steels.
Fine sand is arranged between the steel plate and the top plate of the test beam, the middle double-spliced I-shaped steel, the jack and the loading module.
A plurality of strain measuring points are arranged on a box girder of the test beam, the height positions of the measuring points are determined according to the equivalent neutral axis position of the section of the precast beam, and strain gauges are arranged at the strain measuring points; and the bottom surface of the test beam is also provided with a deflection measuring point, and the deflection measuring point is connected with a displacement meter on the pedestal.
The hoisting equipment consists of a portal crane and a steel wire rope, and the portal crane is connected with the loading module through the steel wire rope.
The utility model has the advantages that: 1) the utility model discloses a gantry crane hoist and mount replace current reaction frame mode of exerting pressure, can control at any time according to the data display of jack lower extreme and apply in the loading load of experimental roof beam, avoid the load to exceed limit bearing capacity and damage roof beam body structure, and move roof beam fast, work efficiency is high, is applicable to the static load test of multi-disc roof beam.
2) The utility model provides a two steel sheet settings between middle part double-pin I-steel and the test roof beam are in the web and the roof boundary position department of test roof beam, and the atress mode of test roof beam is changed into both sides web pressurized by general single-point roof pressurized, avoids under the single-point loading condition too big loading roof beam body that leads to of roof beam center negative moment caused by single-point power and roof beam body prestressing force itself to destroy, has improved experimental degree of safety.
3) The utility model provides a fine sand has all been laid between all steel sheets and other structural connection, not only can eliminate the unevenness error between steel sheet, the double pin I-steel and the roof beam body horizontal contact face, can ensure moreover that the local lifting surface between the structural connection all is unlikely to the undersize.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of the loading support mechanism of FIG. 1;
FIG. 3 is a schematic structural view of the loading module shown in FIG. 1 as a scrapped loading beam;
FIG. 4 is a schematic view of the hoist of FIG. 3;
fig. 5 is a side view of fig. 4.
In the figure, 1-test beam, 2-pedestal, 3-bottom double-spliced I-steel, 4-rubber support, 5-steel plate, 6-middle double-spliced I-steel, 7-jack, 8-loading beam, 9-scrapped loading beam, 10-concrete, 11-gantry crane and 12-steel wire rope.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
Example 1: as shown in fig. 1-2, the precast beam static load test device of the present invention comprises a test beam 1, a loading module, a loading support mechanism and a bottom support structure, wherein the test beam 1 is hoisted with a top plate upward and a bottom plate downward, the bottom plate of the test beam 1 is connected to the upper end of the bottom support structure, the loading support mechanism is laid on the upper end of the top plate, and the loading module is connected to the upper end of the loading support mechanism through a hoisting device; the bottom supporting structure comprises a pedestal 2, two bottom double-spliced I-beams 3 and a rubber support 4, the pedestal 2 is placed on the ground of a test field, the two bottom double-spliced I-beams 3 are placed in parallel and are respectively positioned at two ends of the upper part of the pedestal 2, the test beam 1 is hoisted in parallel to the pedestal 2, and two ends of a bottom plate of the test beam 1 are correspondingly connected to the bottom double-spliced I-beams 3 through the rubber support 4; the loading supporting mechanism comprises steel plates 5, middle double-spliced I-shaped steel 6 and jacks 7, the two steel plates 5 are connected to the junction positions of the top plate and the web plate of the test beam 1, the two ends of the middle double-spliced I-shaped steel 6 are connected to the two steel plates 5 and located in the middle of the upper end of the top plate of the test beam 1, the middle of the upper end of the middle double-spliced I-shaped steel 6 is connected with the jacks 7 through the steel plates 5, and the upper ends of the jacks 7 are connected with the loading modules through the steel plates 5.
The loading module comprises a loading beam 8, steel plates 5 and middle double-spliced I-shaped steel 6 which are the same as the beam body of the test beam 1, the loading beam 8 is hoisted with a top plate facing downwards and a bottom plate facing upwards, the junction position of the top plate and the web plate of the loading beam 8 is connected with the two steel plates 5, and the upper end of the middle double-spliced I-shaped steel 6 is connected to the two steel plates 5 at the lower end of the loading beam 8 and the lower end of the middle double-spliced I-shaped steel 6 is connected to the steel plate.
Two bottom double-spliced I-shaped steel 3 are placed, two rubber supports 4 are connected to the upper end of each bottom double-spliced I-shaped steel 3, and the transverse distance between the two rubber supports 4 is 50 cm.
The bottom double-spliced I-shaped steel 3 and the middle double-spliced I-shaped steel 6 are self-made workpieces and are made by vertically butting the two I-shaped steels and filling concrete 10 in the two I-shaped steels.
Fine sand is arranged between the steel plate 5 and the top plate of the test beam 1, the middle double-spliced I-shaped steel 6, the jack 7 and the loading module.
The hoisting equipment is composed of a gantry crane 11 and a steel wire rope 12, and the gantry crane 11 is connected with the loading module through the steel wire rope 12.
A plurality of strain measuring points are arranged on a box girder of the test beam 1, the height positions of the measuring points are determined according to the equivalent neutral axis position of the cross section of the precast beam, and strain gauges are arranged at the strain measuring points; the bottom surface of the test beam 1 is provided with a deflection measuring point, and the deflection measuring point is connected with a displacement meter on the pedestal 2.
The rubber support 4 is a circular rubber support, the concrete label of the pedestal 2 is C30, and the model of the steel plate 5 is 50cm multiplied by 2 cm.
Example 2: as shown in fig. 3, in the test meeting the bearing capacity limit state, when the required load weight is small or a scrap beam is on site, the scrap load beam 9 in the test site is adopted as the load module, the scrap load beam 9 is arranged with the top plate upward and the bottom plate downward, and the bottom plate of the scrap load beam 9 is connected to the steel plate 5 at the upper end of the jack 7.
As shown in fig. 4-5, the testing steps of the precast beam static load testing apparatus are as follows, taking the loading module as the scrapped loading beam 9 in the embodiment 2 as an example, and the loading manner of the embodiment 1 is the same as that:
preparation work: the prefabricated double-spliced I-shaped steel is formed by vertically butting two I-shaped steels and filling concrete 10 into the two I-shaped steels, and comprises an installation pedestal, a bottom double-spliced I-shaped steel 3 and a rubber support 4.
The method comprises the following operation steps: s1, hoisting the test beam 1, placing two ends of the test beam at the upper end of the bottom double-spliced I-shaped steel 3, and placing two rubber supports 4 on each bottom double-spliced I-shaped steel 3, wherein the transverse distance between the two rubber supports 4 is 50cm, so that the supporting form of the beam body is consistent with the simple supporting state in actual operation.
S2, paving fine sand on the web plates on the left side and the right side of the top span of the test beam 1, and respectively padding a steel plate 5; the two points are arranged at the joint of the web plate and the top plate of the test beam 1, so that the top plate is pressed when the common single-point stress of the static load test is changed into the two-point web plate pressed, and the safety of the test is improved.
S3, paving a layer of fine sand on the steel plate 5, transversely and centrally placing the middle double-spliced I-shaped steel 6 as a distribution beam, and enabling the steel plate 5 to serve as a base plate of the distribution beam.
S4, placing a jack 7 in the center of the distribution beam, strictly prohibiting eccentric loading, placing a steel plate 5 on the jack 7 to ensure that the local stress area of the loading beam is not too small, and then laying a layer of fine sand on the steel plate 5.
And S5, mounting strain gauges, arranging 2 x 7 strain measurement points on each box girder, and determining the height positions of the measurement points according to the equivalent neutral axis position of the section of the precast girder.
S6, mounting a displacement meter, respectively arranging a left deflection measuring point and a right deflection measuring point below a support, a quartet point and a midspan section of the test beam 1, wherein the total number of the measuring points is 10, and for the position of the support, the two measuring points are not positioned at the same section, but are respectively arranged at the inner side and the outer side of the support by 30cm, respectively observing the upper deflection and the lower deflection of the support caused by the inclination of the beam body, and averaging the upper deflection and the lower deflection to be used as the lower deflection of the support.
S7, using two 100t gantry cranes 11 to hoist the abandoned load beam 9 serving as the load module on the site to the top of the test beam 1, and enabling the bottom plate of the abandoned load beam 9 to be parallel to the test beam 1 and stop after the distance between the bottom plate of the abandoned load beam 9 and the steel plate 5 on the jack 7 is 1 cm.
And S8, loading by four stages by using a jack 7.
The utility model discloses a gantry crane hoist and mount replace current reaction frame mode of exerting pressure, and the atress mode of experimental roof beam is changed into both sides web pressurized by general single-point roof pressurized, avoids under the single-point loading condition the too big loading roof beam body impaired destruction that leads to of roof beam center negative moment that arouses by single-point power and roof beam body prestressing force itself, has improved experimental degree of safety, and moves roof beam fast, work efficiency is high, is applicable to the static load test of multi-disc roof beam.
The above-mentioned technical solutions of the present invention are only used for illustration and not for limitation, and other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. The utility model provides a precast beam static test device which characterized in that: the device comprises a test beam (1), a loading module, a loading support mechanism and a bottom support structure, wherein the test beam (1) is provided with a top plate facing upwards and a bottom plate facing downwards, the bottom plate of the test beam (1) is connected to the upper end of the bottom support structure, the loading support mechanism is arranged at the upper end of the top plate, and the loading module is connected to the upper end of the loading support mechanism through hoisting equipment; the bottom supporting structure comprises a pedestal (2), two bottom double-spliced I-beams (3) and a rubber support (4), the pedestal (2) is arranged on the ground of a test field, the two bottom double-spliced I-beams (3) are arranged in parallel and are respectively positioned at two ends of the upper part of the pedestal (2), the test beam (1) is arranged in parallel with the pedestal (2), and two ends of a bottom plate of the test beam (1) are correspondingly connected to the two bottom double-spliced I-beams (3) through the rubber support (4); load supporting mechanism includes steel sheet (5), middle part double-pin I-steel (6) and jack (7), the roof of experimental roof beam (1) is connected two with web position department steel sheet (5), middle part double-pin I-steel (6) both ends are connected two steel sheet (5) are gone up and are located the roof upper end middle part of experimental roof beam (1), middle part double-pin I-steel (6) upper end middle part is passed through steel sheet (5) are connected jack (7), jack (7) upper end is passed through steel sheet (5) are connected the loading module.
2. The precast beam static load test apparatus according to claim 1, characterized in that: the loading module by with test roof beam (1) roof beam body the same load beam (8) steel sheet (5) with middle part double-spliced I-steel (6) are constituteed, load roof beam (8) are roof down, the bottom plate sets up, the roof and the web juncture position department of load roof beam (8) are connected two steel sheet (5), middle part double-spliced I-steel (6) upper end is connected and is located two of load roof beam (8) lower extreme steel sheet (5) upper and lower end are connected and are located jack (7) upper end on steel sheet (5).
3. The precast beam static load test apparatus according to claim 2, characterized in that: when the test meeting the bearing capacity limit state is carried out, under the condition that the required loading weight is small or a scrapped beam exists on the site, the scrapped loading beam (9) in the test site is adopted by the loading module, the scrapped loading beam (9) is arranged with the top plate upward and the bottom plate downward, and the bottom plate of the scrapped loading beam (9) is connected to the steel plate (5) positioned at the upper end of the jack (7).
4. The precast beam static load test apparatus according to claim 1, characterized in that: the bottom double-spliced I-shaped steel (3) is provided with two, every bottom double-spliced I-shaped steel (3) upper end sets up two rubber support (4), two the transverse distance between rubber support (4) is 50 cm.
5. The precast beam static load test apparatus according to claim 1, characterized in that: the bottom double-spliced I-shaped steel (3) and the middle double-spliced I-shaped steel (6) are self-made workpieces and are made by vertically butting the two I-shaped steels and filling concrete (10) in the two I-shaped steels.
6. The precast beam static load test apparatus according to claim 1, characterized in that: the steel plate (5) and the top plate of the test beam (1), the middle double-spliced I-shaped steel (6), the jack (7) and the fine sand are arranged between the loading modules.
7. The precast beam static load test apparatus according to claim 1, characterized in that: the hoisting equipment is composed of a portal crane (11) and a steel wire rope (12), and the portal crane (11) is connected with the loading module through the steel wire rope (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022625395.8U CN213239481U (en) | 2020-11-13 | 2020-11-13 | Precast beam static load test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022625395.8U CN213239481U (en) | 2020-11-13 | 2020-11-13 | Precast beam static load test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213239481U true CN213239481U (en) | 2021-05-18 |
Family
ID=75882057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022625395.8U Active CN213239481U (en) | 2020-11-13 | 2020-11-13 | Precast beam static load test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213239481U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115450270A (en) * | 2022-10-26 | 2022-12-09 | 上海公路桥梁（集团）有限公司 | Loading method for prestress box girder bearing capacity failure test |
-
2020
- 2020-11-13 CN CN202022625395.8U patent/CN213239481U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115450270A (en) * | 2022-10-26 | 2022-12-09 | 上海公路桥梁（集团）有限公司 | Loading method for prestress box girder bearing capacity failure test |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106948268B (en) | Variable-section steel box girder pushing combined device and using method thereof | |
| CN206146751U (en) | A loading device for monospar static test | |
| CN102530732A (en) | Hydraulic hoisting, slipping and emplacing method and equipment for large scale press components | |
| CN213239481U (en) | Precast beam static load test device | |
| CN110700113B (en) | Construction method of prestress applying device of non-prestressed beam bridge | |
| CN206095814U (en) | Monospar static test loading system | |
| CN212175879U (en) | Movable foundation pile static load testing device | |
| CN102877657A (en) | Large-span H-shaped plane composite structure beam string upper-air cable replacement construction method | |
| CN2635739Y (en) | Vertical pressure-resisting static loading tester for pile base | |
| CN103056649B (en) | Super-large-scale multi-functional pressing machine frame installing method | |
| CN201177568Y (en) | Concrete prefabricated element testing device | |
| CN211110815U (en) | Counterforce tool for lifting beam test | |
| CN110714491A (en) | Concrete pile bending test device | |
| CN111894049A (en) | Loading device and test equipment for foundation pile compression-resistant static load test | |
| CN220318607U (en) | Straight-line type distributed anchor pile method foundation pile static load test system | |
| CN218405092U (en) | A cast-in-place roof beam side span construction bracket and pre-compaction device for bridge construction | |
| CN103759928A (en) | Method for detecting bearing load of equalizing beam for hoisting large scale device | |
| CN216947885U (en) | Large-scale cable carries quick-witted counter-force pre-compaction device of crane | |
| CN220150100U (en) | Truss type double-column two-side cantilever type bent cap support | |
| CN218090524U (en) | Installation device for bridge truss | |
| CN215052020U (en) | Reaction frame for prepressing zero block of railway continuous beam | |
| CN218765896U (en) | On-spot full chi test loading device of bridge structures | |
| CN220120401U (en) | Climbing process test device of internal climbing tower crane | |
| CN216615458U (en) | Cushion block device capable of adjusting displacement and inclination angle | |
| CN114136681B (en) | Crane load test device and load test method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |