CN107677551B - Anti-pulling test device and test method for U-shaped beam embedded channel - Google Patents
Anti-pulling test device and test method for U-shaped beam embedded channel Download PDFInfo
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- CN107677551B CN107677551B CN201710882228.1A CN201710882228A CN107677551B CN 107677551 B CN107677551 B CN 107677551B CN 201710882228 A CN201710882228 A CN 201710882228A CN 107677551 B CN107677551 B CN 107677551B
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- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 238000010998 test method Methods 0.000 title abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 230000000149 penetrating effect Effects 0.000 claims abstract description 10
- 238000004080 punching Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 12
- 238000007586 pull-out test Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a U-shaped beam embedded channel pulling-resistant test device and a test method, wherein the test device comprises a connector, an extension rod, a penetrating jack and an anchor, wherein the connector is of a steel sleeve structure with threads arranged inside, one end of the connector is in threaded connection with the exposed end of a T-shaped bolt arranged in a channel of a web plate of the U-shaped beam, the other end of the connector is connected with the extension rod through threads, one end of the extension rod is of deformed steel, threads matched with the connector are arranged at one end of the extension rod, the extension rod is connected with the connector through threads, the other end of the extension rod is exposed after penetrating through the penetrating jack, and the exposed end of the extension rod is anchored at the rear end of the jack through the anchor; the punching jack is a main device for providing drawing force for the test.
Description
Technical Field
The invention relates to the technical field of bridges in civil engineering, in particular to a device and a method for testing the pulling resistance of a U-shaped beam embedded channel.
Background
Along with the rapid development of urban mass transit in China, urban rail transit construction is correspondingly developed. The U-shaped beam is used as a novel urban rail transit bridge structural form, and the U-shaped thin-wall opening section formed by the bottom plate, the web plate and the flange plates has the advantages of light structure weight, good noise reduction effect, low building height, high space utilization rate, driving safety, attractive appearance and the like.
In order to adapt to the current call of energy conservation and emission reduction, the urban rail transit in China adopts electrified operation at present. In order to guarantee erection of power supply control cables, optical cables and cables in electrified operation of the U-beam of rail transit, special hanging pieces for placing the power supply control cables, the optical cables and the cables are required to be arranged inside the U-beam, and the special hanging pieces are fixed on a pre-buried cable channel of the U-beam. Therefore, the stress performance of the embedded cable channel directly influences the stability of power supply cables, optical cables and cable erection and the operation safety of urban rail transit. A pre-buried channel pullout test is generally employed to detect pullout resistance mechanical properties of the pre-buried channel.
Although the national railway industry standard TBT 3329-2013 embedded channel in the electrified railway contact network tunnel requires construction quality and detection projects, how to implement the test is not described in detail. In particular to a channel pulling test, as a T-shaped bolt connected with a channel is shorter, a penetrating jack providing pulling force cannot stretch the exposed end of the bolt, and an extension bar is welded at the end part of the exposed end of the bolt for assisting the jack in pulling the bolt. Although the method solves the problem of insufficient exposed length of the bolt, the method also puts strict requirements on welding work while increasing the welding workload, and is inconvenient in practical operation.
Under the background, the device and the method for testing the pulling resistance of the embedded channel of the U-shaped beam can be developed, and have great practical value.
Disclosure of Invention
The invention aims to overcome the defects in the prior art of the conventional pre-buried channel pulling-resistant test, and provides a device and a method for testing the pulling-resistant of a U-shaped beam pre-buried channel on the premise of the prior art.
In order to achieve the above object, the present invention adopts the following technical measures:
The utility model provides a U-shaped beam pre-buried channel anti-pulling test device, includes connector, extension bar, through heart jack and ground tackle, the connector be a steel sleeve structure that is provided with the screw thread inside, its one end is connected with the exposed end screw thread of the T type bolt that sets up in the channel of U-shaped beam web, the other end passes through the screw thread and is connected with the extension bar, the extension bar be the screw thread steel, one end has set up the screw thread with connector assorted, through screw thread and connector connection, the other end exposes after passing through heart jack, its exposed end is anchored at the heart jack rear end through the ground tackle; the punching jack is a main device for providing drawing force for the test; and (3) a jack is opened to apply drawing force to the extension bar, and the drawing force is transmitted to the T-shaped bolt and the channel through the connector to perform a drawing test.
Further, a cushion block is arranged between the U-shaped beam web plate and the jack to provide drawing counterforce; the cushion block is made of two hollow square steel with equal height.
Further, the connector is of a steel sleeve structure with threads arranged inside, the outer diameter of the connector is unchanged, and the inner diameter of the connector is changed in a step manner; the inner diameter of one end connected with the T-shaped bolt is smaller, the inner diameter is basically the same as the diameter of the T-shaped bolt, and the internal thread is matched with the thread of the bolt; the inner diameter of one end connected with the extension bar is larger, the inner diameter is basically the same as the diameter of the extension bar, and the internal thread is matched with the thread of the extension bar.
Furthermore, the setting range of the internal threads of the connector can meet the checking and calculating requirements of the anti-pulling force threads of the T-shaped bolt and the extension rod.
Furthermore, the diameter of the extension rod is larger than that of a screw rod of the T-shaped bolt, the diameter of the extension rod is required to meet the tensile strength of steel under the action of pulling resistance, and the setting range of threads is required to be slightly larger than that of the internal threads of the connecting end of the connector and the extension rod. The length of the extension rod is slightly larger than that of the through jack, and a certain length is ensured to be exposed.
Further, the anchor is a clamping piece type anchor, and the extension rod can be effectively anchored.
Furthermore, the wider side of the cushion block is tightly attached to the U-shaped web plate, the height of the cushion block is slightly larger than the sum of the length of the exposed T-shaped bolt and the length of the connector, and the two cushion blocks are arranged on two sides of the channel along the channel direction and are ensured to be arranged side by side without contacting with the channel.
The method for testing the anti-pulling of the U-shaped beam embedded channel comprises the following steps:
Step 1: after the T-shaped bolt is placed in the channel and fixed by the nut, the connector and the exposed bolt are screwed tightly by threads.
Step2: the end of the extension bar with the threads is screwed with the connector.
Step 3: and placing the cushion block, and ejecting the jack out by about 2cm to facilitate anchor withdrawal and anchor removal after the test is finished.
Step 4: the extension bar passes through the jack, and after the front end of the jack props against the cushion blocks at two sides, an anchor is used for anchoring the extension bar with the rear end exposed.
Step 5: the jack is started, the front end of the jack continues to be lifted, so that drawing force is generated on the extension rod, the drawing force is transmitted to the T-shaped bolt and the channel through the connector, and loading is stopped after the drawing force is designed.
Step 6: and (3) observing the deformation condition of the channel, and whether the design requirement of the embedded channel in the TBT 3329-2013 electrified railway contact network tunnel is met or not.
Step 7: and (5) withdrawing the anchor, removing the anchor, the extension bar and the connector, and finishing the channel pulling resistance test.
Compared with the prior art, the invention has the following advantages:
(1) The test device is simple to install and can be used repeatedly.
(2) The test process is simple to operate, and the test is safe and reliable.
(3) The invention has the advantages of less material consumption, greatly improved working efficiency, saved working time and good engineering economy.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a cross-sectional view of a U-beam web channel arrangement;
FIG. 2 is a schematic longitudinal cross-sectional view of a channel;
FIG. 3 is a schematic cross-sectional view of a channel;
FIG. 4 is a schematic plan view of a connector;
FIG. 5 is an assembly schematic diagram of a pre-buried channel tensile test device;
In the figure: the device comprises a 1-U-shaped beam, a 2-channel, a 3-anchor rod, a 4-cable hanger, a 5-T-shaped bolt, a 6-nut, 7-threads, an 8-connector, a 9-extension rod, a 10-penetrating jack, an 11-cushion block and a 12-anchor.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As described in the background art, the conventional channel pullout test technology has the following problems: the national railway industry standard TBT 3329-2013 embedded channel in the contact network tunnel of the electrified railway requires construction quality and detection projects, but does not describe how to implement the test in detail. In particular to a channel pulling test, as a T-shaped bolt connected with a channel is shorter, a penetrating jack providing pulling force cannot stretch the exposed end of the bolt, and an extension bar is welded at the end part of the exposed end of the bolt for assisting the jack in pulling the bolt. Although the method solves the problem of insufficient exposed length of the bolt, the method also puts strict requirements on welding work while increasing the welding workload, and is inconvenient in practical operation. In order to solve the technical problems, the application provides a device and a method for testing the pulling resistance of a U-shaped beam embedded channel.
The structure of the present invention is further described below with reference to fig. 1,2, 3, 4, 5.
Compared with the traditional channel pulling-resistant test technology, the invention provides the test device and the test method which can meet the pulling-resistant test of the U-shaped beam embedded channel.
Referring to fig. 1 to 5, the anti-pulling test device for the pre-buried channel 2 of the U-shaped beam 1 specifically comprises a T-shaped bolt 5, a connector 8, an extension bar 9, a penetrating jack 10, a cushion block 11 and an anchor 12.
The connector 8 is of a steel sleeve structure with threads 7 arranged inside, one end of the connector is connected with the exposed end of the T-shaped bolt 5 through the threads 7, and the T-shaped bolt 5 is clamped in the embedded channel 2 of the web plate of the U-shaped beam 1; the other end is connected with an extension bar 9 through threads 7, the extension bar 9 is screw steel, threads 7 matched with the connector 8 are arranged at one end of the extension bar, the extension bar is connected with the connector 8 through the threads 7, the through jack 10 is a main device for providing drawing force for a test, the extension bar 9 passes through the front end of the jack 10, the exposed end is anchored at the rear end of the jack 10 through an anchorage device 12, the cushion block 11 is two hollow square steel blocks with equal height, and the cushion block is arranged between a web plate of the U-shaped beam 1 and the jack 10 to provide drawing counter force.
Referring to fig. 2 to 4, the connector 8 is a steel sleeve with a constant outer diameter and a stepwise-variable inner diameter, one end connected with the bolt 5 has a smaller inner diameter, the inner diameter is basically the same as the diameter of the bolt 5, and the internal thread is matched with the thread 7 of the bolt 5; the inner diameter of the end connected with the extension bar 9 is larger, the inner diameter is basically the same as the diameter of the extension bar 9, and the internal thread 7 is matched with the thread 7 of the extension bar 9.
With reference to fig. 4, the setting range of the internal thread 7 of the connector 8 should meet the requirement of checking the anti-pulling force threads of the T-shaped bolt 5 and the extension rod 9.
Referring to fig. 5, the diameter of the extension bar 9 is larger than that of the bolt 5, the diameter of the extension bar is required to meet the tensile strength of steel under the action of pulling resistance, and the setting range of the threads 7 is required to be slightly larger than that of the threads 7 inside the connecting end of the connector 8 and the extension bar 9. The length of the extension rod 9 is slightly longer than that of the through jack 10, and a certain length is exposed.
Referring to fig. 5, anchor 12 is a clip-type anchor that is effective to anchor extension 9.
With reference to fig. 5, the wider side of the spacer 11 is tightly attached to the web of the U-beam 1, and its height is slightly greater than the sum of the length of the exposed bolt 5 and the length of the connector 8, and two spacers 11 are arranged along the channel 2, on both sides of the channel 2, and are arranged side by side without contacting with the channel 2.
The method for carrying out the pulling-out test by using the pulling-out test device for the U-shaped beam embedded channel comprises the following steps:
step 1: after the T-bolts 5 are placed in the channels 2 and secured by nuts 6, the connectors 8 are screwed with the exposed bolts 5 by threads 7.
Step 2: the end of the extension rod 9 with the thread 7 is screwed with the connector 8 by the thread 7.
Step 3: and placing the cushion block 11, and ejecting the jack 10 by about 2cm to facilitate anchor withdrawal and anchor removal 12 after the test is finished.
Step 4: the extension bar 9 passes through the jack 10, and after the front end of the jack 10 props against the cushion blocks 11 at the two sides, an anchor 12 is used for anchoring the extension bar 9 with the rear end exposed.
Step 5: the jack 10 is started, the front end of the jack 10 continues to be lifted, so that drawing force is generated on the extension rod 9, the drawing force is transmitted to the T-shaped bolt 5 and the channel 2 through the connector 8, and loading is stopped after the drawing force is designed.
Step 6: and (3) observing the deformation condition of the channel 2, and whether the design requirement of the embedded channel in the TBT 3329-2013 electrified railway contact network tunnel is met.
Step 7: and (5) withdrawing the anchor, removing the anchor 12, the extension rod 9 and the connector 8, and completing the anti-pulling test of the channel 2.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (4)
1. The U-shaped beam embedded channel pulling resistance test device is characterized by comprising a connector, an extension rod, a penetrating jack and an anchor, wherein the connector is of a steel sleeve structure with threads arranged inside, one end of the connector is in threaded connection with the exposed end of a T-shaped bolt arranged in a channel of a web plate of the U-shaped beam, the other end of the connector is connected with the extension rod through threads, the extension rod is made of deformed steel bars, one end of the extension rod is provided with threads matched with the connector and is connected with the connector through threads, the other end of the extension rod is exposed after penetrating through the penetrating jack, and the exposed end of the extension rod is anchored at the rear end of the penetrating jack through the anchor; the punching jack is a main device for providing drawing force for the test;
A cushion block is arranged between the U-shaped beam web plate and the jack to provide drawing counterforce; the wider side of the cushion block is tightly attached to the U-shaped web plate, the height of the cushion block is slightly larger than the sum of the length of the exposed T-shaped bolt and the length of the connector, and the two cushion blocks are arranged on two sides of the channel along the channel direction and are ensured to be arranged side by side without contacting with the channel; the outer diameter of the connector is unchanged, and the inner diameter is changed in a step manner; the inner diameter of one end of the connector, which is connected with the T-shaped bolt, is smaller, the inner diameter is the same as the diameter of the T-shaped bolt, and the internal thread is matched with the thread of the bolt; the inner diameter of one end connected with the extension bar is larger, the inner diameter is the same as the diameter of the extension bar, and the internal thread is matched with the thread of the extension bar; the diameter of the extension rod is larger than that of a screw rod of the T-shaped bolt, and the diameter of the extension rod meets the tensile strength of steel under the action of pulling resistance; the length of the extension rod is longer than that of the through jack, and a certain length is ensured to be exposed; the anchor is a clamping piece type anchor, and can effectively anchor the extension bar;
And (3) a jack is opened to apply drawing force to the extension bar, and the drawing force is transmitted to the T-shaped bolt and the channel through the connector to perform a drawing test.
2. The device for testing the pullout resistance of the embedded channel of the U-shaped beam according to claim 1, wherein the setting range of the internal threads of the connector is required to meet the requirement of the test calculation of the pullout resistance threads of the T-shaped bolt and the extension rod.
3. The U-beam pre-buried channel pullout test apparatus of claim 2, wherein the extension bar thread setting range is greater than the connector and extension bar connection end internal thread setting range.
4. A method for carrying out a pullout test by using the pullout test device for a U-shaped beam embedded channel according to any one of claims 1 to 3, which is characterized by comprising the following steps:
Step 1: after the T-shaped bolt is placed in the channel and fixed through the nut, the connector and the exposed bolt are screwed tightly through threads;
Step 2: the end of the extension rod with threads is screwed tightly with the connector through threads;
Step 3: placing a cushion block, and ejecting the jack to about 2cm to facilitate anchor withdrawal and anchor removal after the test is finished;
Step 4: the extension bar passes through the jack, and after the front end of the jack props against the cushion blocks at two sides, an anchor is used for anchoring the extension bar with the rear end exposed;
Step 5: starting the jack, continuously lifting the front end of the jack, generating drawing force on the extension bar, transmitting the drawing force to the T-shaped bolt and the channel through the connector, and stopping loading after the drawing force is designed;
step 6: observing the deformation condition of the channel, and judging whether the deformation condition meets the design requirement of the embedded channel in the TBT 3329-2013 electrified railway contact network tunnel;
step 7: and (5) withdrawing the anchor, removing the anchor, the extension bar and the connector, and finishing the channel pulling resistance test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710882228.1A CN107677551B (en) | 2017-09-26 | 2017-09-26 | Anti-pulling test device and test method for U-shaped beam embedded channel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710882228.1A CN107677551B (en) | 2017-09-26 | 2017-09-26 | Anti-pulling test device and test method for U-shaped beam embedded channel |
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| CN107677551A CN107677551A (en) | 2018-02-09 |
| CN107677551B true CN107677551B (en) | 2024-04-30 |
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| CN109946151B (en) * | 2019-03-11 | 2023-10-27 | 江苏城工建设科技有限公司 | Stretching detection combined device for embedded channel |
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