CN216041387U - Cylindrical cast steel heavy hammer with conical bottom edge for high-strain-method pile measurement - Google Patents
Cylindrical cast steel heavy hammer with conical bottom edge for high-strain-method pile measurement Download PDFInfo
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- CN216041387U CN216041387U CN202122516233.5U CN202122516233U CN216041387U CN 216041387 U CN216041387 U CN 216041387U CN 202122516233 U CN202122516233 U CN 202122516233U CN 216041387 U CN216041387 U CN 216041387U
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- pile
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- top surface
- truncated cone
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 10
- 238000005259 measurement Methods 0.000 title claims description 6
- 238000001514 detection method Methods 0.000 abstract description 8
- 239000004576 sand Substances 0.000 description 6
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model aims to provide a cylindrical cast steel heavy hammer which has a simple structure and can improve the stress concentration phenomenon in the detection process so as to reduce the damage to a pile body and is used for measuring the conical surface at the bottom edge of a pile by a high strain method. The hammer comprises a hammer body, wherein the hammer body is cylindrical, a cone frustum is arranged on the hammer body, the diameter of the top surface of the cone frustum is larger than that of the bottom surface of the cone frustum, the diameter of the top surface of the cone frustum is equal to that of the bottom surface of the hammer body, and the top surface of the cone frustum is connected with the bottom surface of the hammer body. The utility model is applied to the technical field of foundation detection.
Description
Technical Field
The utility model is applied to the technical field of foundation detection, and particularly relates to a cylindrical cast steel heavy hammer with a conical bottom edge for high-strain method pile measurement.
Background
At present, measuring hammers used for measuring piles by a high-strain method in the industry are all prism bodies with square cross sections and are flat-bottomed, and are shown in figure 1. However, piling using a prismatic hammer has three problems:
1. because the cross section of the hammer body is square, but the cross section of the pile body is circular, when the cross section of the hammer body is smaller than that of the pile body, the contact part of the pile body with a hammer edge and a hammer angle has a stress concentration phenomenon, the cross section of the pile body has a serious stress uneven distribution phenomenon, and the stress strain value measured by a pile measuring sensor cannot truly reflect the average stress strain value of the pile body;
2. the existing prism measuring hammer is flat-bottomed, and in the using process, when the hammer bottom is in contact with the pile top surface, if the bottom surface of the hammer body is not parallel to the pile top surface due to mechanical operation errors, the hammer body and the pile body are in line contact or point contact. In daily detection, although a sand cushion layer with the thickness of about 2cm is paved on the top surface of the pile body, the stress concentration phenomenon is still very serious;
3. the stress concentration phenomenon of four corners of the contact surface of the prism measuring hammer and the pile top exists during hammering, so that the problem of local compression of the pile top is very serious, and the pile foundation is easy to break off corners, cracks and the like.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to overcome the defects of the prior art, and provide a cylindrical cast steel heavy hammer for measuring the bottom edge of a pile by a high strain method, which has a simple structure, can improve the stress concentration phenomenon in the detection process, thereby reducing the damage to the pile body, and can well solve the problems.
The technical scheme adopted by the utility model is as follows: the hammer comprises a hammer body, wherein the hammer body is cylindrical, a cone frustum is arranged on the hammer body, the diameter of the top surface of the cone frustum is larger than that of the bottom surface of the cone frustum, the diameter of the top surface of the cone frustum is equal to that of the bottom surface of the hammer body, and the top surface of the cone frustum is connected with the bottom surface of the hammer body.
Furthermore, two guide grooves are formed in the hammer body and are respectively located on the left side and the right side of the hammer body.
Further, a lifting lug is arranged on the top surface of the hammer body.
Furthermore, the lug includes connecting rod and two supporting blocks, two the supporting block all sets up the top surface of hammer block, two the supporting block passes through the connecting rod links to each other.
Furthermore, the height of the cone frustum is 3cm-5cm, and the included angle between the side surface axis of the cone frustum and the bottom surface of the cone frustum is 120-160 degrees.
The utility model has the beneficial effects that: firstly, the pile body is cylindrical, the hammer body is made into a cylindrical shape, when the hammer body is knocked down on the pile body, the two circular surfaces are in contact, the circularly distributed stress of the contact surface can be uniformly diffused downwards into the pile body, and the signal collected by the pile measuring sensor arranged on the pile body can more truly reflect the average stress state of the pile body; secondly, laying a sand cushion layer with the thickness of about 2cm on the top surface of the pile body during daily detection, arranging a cone frustum at the bottom of the hammer body, and at the moment when the bottom of the cone frustum is contacted with the top surface of the pile body, if the bottom surface of the cone frustum is not parallel to the top surface of the pile body, contacting partial side surface and partial bottom surface of the cone frustum with the sand cushion layer on the top surface of the pile body instead of the line contact or point contact in the prior art, so that the stress concentration phenomenon is greatly improved; thirdly, the stress concentration phenomenon of four corners when the prism measuring hammer is contacted with the top surface of the pile body can not occur, and the problem of local compression of the pile top is greatly improved, so that the damage to the pile body caused by the detection process can be obviously reduced.
Drawings
FIG. 1 is a schematic view of a prism bob in use;
FIG. 2 is a schematic diagram of an application of the present invention;
FIG. 3 is a front view of the present invention;
FIG. 4 is a side view of the present invention;
fig. 5 is a top view of the present invention.
Detailed Description
As shown in fig. 1 to 5, in the present embodiment, the present invention includes a hammer body 1, the hammer body 1 is cylindrical, a truncated cone 2 is disposed on the hammer body 1, a top diameter of the truncated cone 2 is larger than a bottom diameter of the truncated cone 2, the top diameter of the truncated cone 2 is equal to the bottom diameter of the hammer body 1, and the top surface of the truncated cone 2 is connected to the bottom surface of the hammer body 1.
In this embodiment, a sand cushion layer with a thickness of about 2cm is laid on the top surface of the pile body 7, and after the hammer 1 falls on the top surface of the pile body 7, the average stress state of the pile body 7 is detected by using a pile measuring sensor 8 mounted on the pile body 7.
In this embodiment, the hammer body 1 is provided with two guide grooves 3, and the two guide grooves 3 are respectively located on the left side and the right side of the hammer body 1. The two guide grooves 3 are respectively matched with the two guide rails on the hammer frame, and in the process that the hammer body 1 falls on the pile body 7, the two guide grooves 3 play a role in positioning and guiding.
In this embodiment, the top surface of the hammer body 1 is provided with a lifting lug 4, so that a lifting hook on the hammer frame can be conveniently hooked on the lifting lug 4.
In this embodiment, the lifting lug 4 includes a connecting rod 5 and two supporting blocks 6, the two supporting blocks 6 are both disposed on the top surface of the hammer body 1, and the two supporting blocks 6 are connected through the connecting rod 5.
In the embodiment, the height of the truncated cone 2 is 3cm-5cm, and the included angle between the side surface axis of the truncated cone 2 and the bottom surface of the truncated cone 2 is 120-160 degrees. The prism-shaped measuring hammer in the prior art has an included angle of 90 degrees between the side surface and the bottom surface. Compared with the prior art, when the test is carried out under the condition that the bottom surface of the measuring hammer is not parallel to the top surface of the pile body, the contact area between the conical frustum 2 and a sand cushion layer can be increased, so that the pressure on the local part of the pile top is reduced.
In this embodiment, at the moment when the hammer 1 hits the pile 7, if the bottom surface of the truncated cone 2 is not parallel to the top surface of the pile 7, part of the side surface and part of the bottom surface of the truncated cone 2 will contact the sand cushion layer on the top surface of the pile 7, instead of the prior art line contact or point contact, so that the stress concentration phenomenon is greatly improved.
In this embodiment, since the pile body 7 is cylindrical, the hammer body 1 is made into a cylindrical shape, when the hammer body 1 is knocked down on the pile body 7, two circular surfaces are in contact with each other, the circularly distributed stress of the contact surface can be uniformly diffused downwards into the pile body 7, and the signal collected by the pile measuring sensor 8 installed on the pile body 7 can more truly reflect the average stress state of the pile body 7.
In this embodiment, the stress concentration at the four corners of the prism hammer is not concentrated when the prism hammer contacts the top surface of the pile, and the problem of local compression of the pile top is also greatly improved, so that the damage to the pile caused by the detection process can be remarkably reduced.
Claims (5)
1. The utility model provides a cylinder cast steel weight that is used for edge of high strain method survey pile to be conical surface, its characterized in that: the hammer comprises a hammer body (1), wherein the hammer body (1) is cylindrical, a truncated cone (2) is arranged on the hammer body (1), the diameter of the top surface of the truncated cone (2) is larger than that of the bottom surface of the truncated cone (2), the diameter of the top surface of the truncated cone (2) is equal to that of the bottom surface of the hammer body (1), and the top surface of the truncated cone (2) is connected with the bottom surface of the hammer body (1).
2. The cylindrical cast steel weight for high strain method measurement pile with conical bottom edge as claimed in claim 1, wherein: the hammer body (1) is provided with two guide grooves (3), and the two guide grooves (3) are respectively positioned on the left side and the right side of the hammer body (1).
3. The cylindrical cast steel weight for high strain method measurement pile with conical bottom edge as claimed in claim 1, wherein: the top surface of the hammer body (1) is provided with a lifting lug (4).
4. The cylindrical cast steel weight for high strain gage pile with conical bottom edge as claimed in claim 3, wherein: the lifting lug (4) comprises a connecting rod (5) and two supporting blocks (6), the two supporting blocks (6) are arranged on the top surface of the hammer body (1), and the two supporting blocks (6) are connected through the connecting rod (5).
5. The cylindrical cast steel weight for high strain method measurement pile with conical bottom edge as claimed in claim 1, wherein: the height of the truncated cone (2) is 3cm-5cm, and the included angle between the side axis of the truncated cone (2) and the bottom surface of the truncated cone (2) is 120-160 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122516233.5U CN216041387U (en) | 2021-10-19 | 2021-10-19 | Cylindrical cast steel heavy hammer with conical bottom edge for high-strain-method pile measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122516233.5U CN216041387U (en) | 2021-10-19 | 2021-10-19 | Cylindrical cast steel heavy hammer with conical bottom edge for high-strain-method pile measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216041387U true CN216041387U (en) | 2022-03-15 |
Family
ID=80549547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122516233.5U Expired - Fee Related CN216041387U (en) | 2021-10-19 | 2021-10-19 | Cylindrical cast steel heavy hammer with conical bottom edge for high-strain-method pile measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216041387U (en) |
-
2021
- 2021-10-19 CN CN202122516233.5U patent/CN216041387U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220315 |
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| CF01 | Termination of patent right due to non-payment of annual fee |