CN209816940U - A horizontal key steel protects a section of thick bamboo for pile foundation soil layer limit side frictional resistance test - Google Patents
A horizontal key steel protects a section of thick bamboo for pile foundation soil layer limit side frictional resistance test Download PDFInfo
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- CN209816940U CN209816940U CN201920412812.5U CN201920412812U CN209816940U CN 209816940 U CN209816940 U CN 209816940U CN 201920412812 U CN201920412812 U CN 201920412812U CN 209816940 U CN209816940 U CN 209816940U
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Abstract
The utility model provides a transverse key steel protects a section of thick bamboo for test of pile foundation soil layer limit side frictional resistance, it has a reaction frame to weld on the steel protects a section of thick bamboo inner wall, the hoop is equipped with a plurality of transverse keys on the section of thick bamboo wall of steel protects a section of thick bamboo, a plurality of transverse keys divide into at least two-layer, each layer of hoop equidistance sets up at least 4; the transverse key is a section of section steel with a certain length, the section steel is perpendicular to the axis of the steel protective cylinder, one end of the transverse key is positioned in the steel protective cylinder and welded with the steel protective cylinder, and the other end of the transverse key protrudes out of the wall of the steel protective cylinder. The utility model discloses at the steel protect a section of thick bamboo and insert and beat installation horizontal key behind the soil, resistance between multiplicable steel protect a section of thick bamboo and the soil layer ensures to utilize the steel to protect a section of thick bamboo self-reaction and carries out pile foundation soil layer limit side frictional resistance test time steel protect a section of thick bamboo and do not take place the displacement.
Description
Technical Field
The utility model belongs to the technical field of bridge pile foundation construction, a steel that utilizes steel to protect a section of thick bamboo self-reaction to carry out the test to pile foundation soil layer limit side frictional resistance protects a section of thick bamboo is related to.
Background
The concrete friction pile mainly provides supporting force by means of friction force between the side wall of the pile foundation and a rock-soil layer, so that testing of the friction force between the concrete pile foundation and the soil layer before construction is the most important construction link, reasonable mechanical parameters can be provided for design of the pile foundation, and the stress performance of the pile foundation is ensured.
The traditional concrete pile test method mainly comprises two methods: firstly, a stacking method; the second is an anchor pile method. The pile loading method is to load a certain load on the pile top of the pile to test the bearing capacity of the pile foundation. The stacking method has the disadvantages that the material demand is large, mechanical equipment is needed for transferring the stacking material, the engineering quantity is large, the stacking quantity is not easy to control, and the accuracy of the test result is influenced; the anchor pile method is that the anchor piles are inserted and driven around the pile foundation, then the anchor piles are used as platforms to arrange reaction frames, and a jack is used for pushing the reaction frames to carry out back pressure on the pile foundation so as to test the bearing capacity of the pile foundation. The construction of the anchor pile is limited by geological conditions, and the anchor pile is often pulled up in the test process, so that the test fails. In addition, the two methods both need to construct a complete test pile, and the test cost is high due to high construction cost and long working time of the pile foundation. In addition, the two methods are more suitable for land environment, and have higher difficulty in testing the pile foundation in water.
Based on the reasons, the applicant conducts exploration tests in construction and designs a method for carrying out ultimate side frictional resistance of a pile foundation soil layer by using self-reaction force of a steel pile casing, the basic principle of the method is as shown in figure 1, the steel pile casing 1 is firstly inserted into the soil layer needing to be tested for frictional resistance, soil in the steel pile casing is removed, then a concrete pile 2 located in a test soil layer is drilled in the steel pile casing, a reaction frame 3 is welded on the inner wall of the steel pile casing, a jacking jack 4 is installed between the concrete pile top and the reaction frame, the jacking jack 4 utilizes the frictional resistance force of the steel pile casing 1 and the soil layer to carry out back pressure on the concrete pile 2, the ultimate side frictional resistance force of the concrete pile 2 and a tested soil layer is tested, and basis is provided for actual pile foundation design and construction.
According to the test method, the steel casing provides counter force, so that the counter force provided by the steel casing is of great importance to the test. In order to prevent the steel pile casing from upwards displacing in back pressure, a layer of cement mortar is poured between the outer wall of the steel pile casing and a soil layer in a test, but under the condition that the size of a concrete pile is large, the counter force provided by the steel pile casing cannot meet the requirement, and therefore certain measures are needed to be taken to increase the counter force provided by the steel pile casing.
Disclosure of Invention
An object of the utility model is to above-mentioned demand, protect a structure of section of thick bamboo to the steel and improve, the steel protects the ability that a section of thick bamboo provided the counter-force when further increasing the test.
The technical scheme of the utility model as follows:
the utility model provides a horizontal key steel protects a section of thick bamboo for pile foundation soil layer limit side frictional resistance test, the welding has a reaction frame, its characterized in that on a steel protects a section of thick bamboo inner wall: a plurality of transverse keys are annularly arranged on the wall of the steel casing, the plurality of transverse keys are divided into at least two layers, and at least 4 transverse keys are annularly arranged on each layer at equal intervals; the transverse key is a section of section steel with a certain length, the section steel is perpendicular to the axis of the steel protective cylinder, one end of the transverse key is positioned in the steel protective cylinder and welded with the steel protective cylinder, and the other end of the transverse key protrudes out of the wall of the steel protective cylinder.
Above-mentioned a horizontal key steel protects a section of thick bamboo for pile foundation soil layer limit side frictional resistance test still can the steel protects 4 back pressure brackets of hoop evenly welded on a section of thick bamboo upper end outer wall, alternate an stock on the bracket, the rear end of stock is fixed with the nut and the bracket, and the stock front end is protected a section of thick bamboo outer wall below to the steel and is extended.
The utility model is used for utilize steel to protect a section of thick bamboo self-reaction and carry out pile foundation soil layer limit side frictional resistance test, through set up the cross key on the steel protects a section of thick bamboo, transversely insert the cross key in the steel protects a section of thick bamboo outside soil layer, can improve the stability of steel protecting a section of thick bamboo in the soil layer greatly, can satisfy the test requirement of jumbo size concrete pile; under the condition of proper address, the anchor rod is arranged on the steel casing, so that the capability of the steel casing for providing counter force can be further increased.
Drawings
FIG. 1 is a schematic diagram of testing the ultimate side frictional resistance of a pile foundation soil layer by using the self-reaction force of a steel casing;
fig. 2 is a schematic structural diagram of the present invention;
FIG. 3 is a plan view of a transverse key of the present invention;
FIG. 4 is a plan view of another arrangement of the horizontal key of the present invention;
FIG. 5 is a plan view of the arrangement of the back pressure corbel and the anchor bolt on the top of the steel casing;
fig. 6 is a schematic view of the usage of the present invention.
Detailed Description
As shown in fig. 2 and 3, the inner wall of the steel casing 1 of the present invention is welded with a reaction frame 3, a plurality of transverse keys 5 are circumferentially arranged on the wall of the steel casing 1, the plurality of transverse keys 5 are divided into at least two layers, and at least 4 transverse keys are circumferentially arranged in each layer at equal intervals; the transverse key 5 is a section of section steel with a certain length, is perpendicular to the axis of the steel casing, has one end positioned in the steel casing and welded with the steel casing 1, and has the other end protruding out of the wall of the steel casing.
As shown in fig. 6, the utility model discloses during the use, set up the through-hole in advance at every transverse key mounted position on 1 section of thick bamboo wall of steel casing, do not install the transverse key earlier on the steel casing, after 1 inserts the ground of digging into and cleaing away in the steel casing, concrete pile 2 in the construction steel casing, installation reaction frame 3 and jack 4, in inserting outside soil layer with 5 one end of transverse key from the through-hole in the steel casing, then with the welding of the transverse key other end and steel casing. And starting the jack 4 to push the reaction frame 3 upwards to perform back pressure on the concrete pile 2 at the bottom of the steel casing, and providing a reaction force by the resistance between the steel casing 1 and the soil layer. The transverse key 5 plays a role in increasing the resistance of the steel casing.
In order to facilitate the insertion of the transverse key, the end surface of the transverse key 5 protruding out of the steel casing can be provided with an inclined surface.
As shown in fig. 4, a stop block 51 may be welded at one end of the transverse key 5 located in the steel casing to prevent the transverse key from separating from the steel casing when the transverse key is inserted.
As shown in fig. 2, 5 and 6, the resistance between the steel casing and the soil layer is further increased, under the condition of proper geology, 4 back pressure brackets 6 can be uniformly welded on the outer wall of the upper end of the steel casing in the circumferential direction, an anchor rod 7 is inserted into each bracket, the rear end of each anchor rod 7 is fixed with the corresponding bracket 6 through a nut, and the anchor head at the front end of each anchor rod extends towards the outer oblique lower side of the steel casing 1 and is inserted into the soil layer outside the steel casing.
Claims (4)
1. The utility model provides a horizontal key steel protects a section of thick bamboo for pile foundation soil layer limit side frictional resistance test, the welding has a reaction frame, its characterized in that on a steel protects a section of thick bamboo inner wall: a plurality of transverse keys are annularly arranged on the wall of the steel casing, the plurality of transverse keys are divided into at least two layers, and at least 4 transverse keys are annularly arranged on each layer at equal intervals; the transverse key is a section of section steel with a certain length, the section steel is perpendicular to the axis of the steel protective cylinder, one end of the transverse key is positioned in the steel protective cylinder and welded with the steel protective cylinder, and the other end of the transverse key protrudes out of the wall of the steel protective cylinder.
2. The transverse key steel casing for testing the ultimate side frictional resistance of the pile foundation soil layer according to claim 1, which is characterized in that: the end face of one end of the transverse key protruding out of the steel casing is an inclined plane.
3. The transverse key steel casing for testing the ultimate side frictional resistance of the pile foundation soil layer according to claim 1, which is characterized in that: and a limiting block is welded at one end of the transverse key, which is positioned in the steel casing.
4. The transverse key steel casing for testing the ultimate side frictional resistance of the pile foundation soil layer according to claim 1, which is characterized in that: 4 back pressure brackets of hoop evenly welded on the steel protects a section of thick bamboo upper end outer wall, alternate an stock on the bracket, the rear end of stock is fixed with the bracket with the nut, and the stock front end extends to the outer oblique below of steel protects a section of thick bamboo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920412812.5U CN209816940U (en) | 2019-03-28 | 2019-03-28 | A horizontal key steel protects a section of thick bamboo for pile foundation soil layer limit side frictional resistance test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920412812.5U CN209816940U (en) | 2019-03-28 | 2019-03-28 | A horizontal key steel protects a section of thick bamboo for pile foundation soil layer limit side frictional resistance test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209816940U true CN209816940U (en) | 2019-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920412812.5U Active CN209816940U (en) | 2019-03-28 | 2019-03-28 | A horizontal key steel protects a section of thick bamboo for pile foundation soil layer limit side frictional resistance test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209816940U (en) |
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2019
- 2019-03-28 CN CN201920412812.5U patent/CN209816940U/en active Active
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