CN217267692U - Indoor test system for rotary cast-in-place pile in karst area - Google Patents
Indoor test system for rotary cast-in-place pile in karst area Download PDFInfo
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- CN217267692U CN217267692U CN202220620544.8U CN202220620544U CN217267692U CN 217267692 U CN217267692 U CN 217267692U CN 202220620544 U CN202220620544 U CN 202220620544U CN 217267692 U CN217267692 U CN 217267692U
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Abstract
The utility model relates to a gyration bored concrete pile analogue test field discloses an indoor test system of a gyration bored concrete pile in karst area, the system includes a main body frame with a beam and a vertical beam, and a base placed below the beam, the lower surface of the beam is provided with a fixed pulley; the base upper surface is provided with circular blind hole, it has fixed pipe to peg graft in the circular blind hole, the fixed pipe endotheca is equipped with first sleeve pipe, first sleeve pipe endotheca is equipped with the second sleeve pipe, has the clearance that can fill the rubble between first sleeve pipe and the second sleeve pipe, the system still includes the motor and the pulling force rope of being connected with the motor, the pulling force rope other end is walked around the fixed pulley is connected first sleeve pipe. The system directly and reasonably simulates the pipe drawing and loading processes of the rotary cast-in-place pile in the karst area, reduces the experiment procedures and improves the experiment efficiency.
Description
Technical Field
The utility model relates to a gyration bored concrete pile analogue test field specifically relates to a karst area gyration bored concrete pile laboratory test system.
Background
The karst distribution of China is wide, the karst distribution is mainly distributed in areas such as Guangxi, Yunnan, Hunan and the like, wherein the Guangxi area is a typical karst landform, the underground water distribution is rich, rock masses in the karst area can generate holes and cracks under the erosion and scouring action of the underground water, the strength of the rock is reduced, a pile foundation can penetrate into a weak stratum and a karst cave, a pile end is selected to fall on the rock mass meeting the bearing capacity of the pile foundation, the requirements of the safety and the stability of a tall structure are met, and pile foundations in the karst area are subjected to multi-selection and full-casing full-rotation drilling and grouting. During the construction, need carry out the tube drawing to bored concrete pile, but what condition specifically can appear behind the tube drawing, all know through observing behind the tube drawing at present, do not have relevant device can simulate site environment, the state change after the simulation test bored concrete pile tube drawing.
In the prior art, CN201621049701.5 is a model test device suitable for cast-in-place pile casting process simulation, and includes a metal frame platform, a metal funnel is disposed on the metal frame platform, an inlet of the metal funnel protrudes from the metal frame platform, and an outlet of the metal funnel is connected to a pile body component through a conduit. Although a simulation test device is disclosed in the prior art, the following problems still exist:
1) the pipe drawing and loading processes of the rotary cast-in-place pile in the karst area cannot be directly and reasonably simulated;
2) the tube drawing process and the loading process of the rotary cast-in-place pile can not be effectively combined together, the experimental procedures can not be reduced, and the experimental efficiency is low.
Disclosure of Invention
The utility model provides a technical problem lie in overcoming prior art's defect, provide a karst area gyration bored concrete pile laboratory test system.
The purpose of the utility model is realized through the following technical scheme:
an indoor test system for a rotary cast-in-place pile in a karst area comprises a main body frame with a cross beam and a vertical beam, and a base arranged below the cross beam, wherein a fixed pulley is arranged on the lower surface of the cross beam; the base upper surface is provided with circular blind hole, it has fixed pipe to peg graft in the circular blind hole, the fixed pipe endotheca is equipped with first sleeve pipe, first sleeve pipe endotheca is equipped with the second sleeve pipe, has the clearance that can fill the rubble between first sleeve pipe and the second sleeve pipe, the system still includes the motor and the pulling force rope of being connected with the motor, the pulling force rope other end is walked around the fixed pulley is connected first sleeve pipe.
Further, not only a communicating pipe is connected to the pipeline on the outer wall of the fixed pipe, a piston is arranged on a port far away from the fixed pipe, and the accommodating size of the communicating pipe is adjusted through the piston.
More closely, be provided with the internal thread on the communicating pipe inner wall, the piston is the bolt with internal thread matching.
Furthermore, a first through hole is formed in the outer wall of the top of the first sleeve, and the tension rope penetrates through the first through hole and is fixedly connected with the first sleeve.
Furthermore, foundation bolts are symmetrically arranged on the upper surface of the base and connected with the fixing pipe through support rods.
The device is further characterized in that a load sensor, a hydraulic jack, a magnetic base and a dial indicator connected with the magnetic base are arranged on the lower surface of the cross beam; and a strain gauge connected with a dial indicator is arranged in the second sleeve, and the load sensor and the hydraulic jack are connected with the upper surface of the second sleeve.
Furthermore, a loading cover with a second through hole is arranged on the top of the second sleeve, a connecting line of the strain gauge penetrates through the through hole to be connected with the dial indicator, and the load sensor and the hydraulic jack are connected with the loading cover.
Furthermore, the loading cap includes a first cylinder and a second cylinder, which are coaxial, the first cylinder abuts against the upper surface of the second protection tube, and the second cylinder is disposed inside the cavity of the second protection tube.
Further, the fixed pipe is a steel pipe.
Further, the first sleeve is a PVC pipe, and the second sleeve is a UPVC pipe.
Compared with the prior art, the utility model discloses following beneficial effect has:
1) the experimental system can directly and reasonably simulate the pipe drawing and loading processes of the rotary cast-in-place pile in the karst area;
2) two sides of the steel pipe for simulating the surrounding rock are provided with extended communicating pipes, and the size of the karst cave can be simulated through the depth of the piston in and out;
3) the pulling-out speed of the sleeve can be controlled by the stepless speed change motor;
4) the experiment system effectively combines the pipe drawing process and the loading process of the rotary cast-in-place pile, effectively reduces experiment procedures and improves experiment efficiency;
5) the P-S curve of the bearing capacity of the pile body and the lateral frictional resistance value of the pile body can be obtained, the bearing performance mechanism of the pile under the working condition is understood and analyzed, and the pile bearing capacity is laid for the subsequent experimental study of the bearing capacity of the pile under the condition of lateral pot-shaped karst formed by similar material proportion.
Drawings
FIG. 1 is a schematic structural diagram of a pipe drawing state of a rotary cast-in-place pile indoor test system in a karst area;
FIG. 2 is a schematic diagram of a pressurized state structure of an indoor test system for a rotary cast-in-place pile in a karst area;
fig. 3 is a schematic structural diagram of a loading cover of a rotary cast-in-place pile indoor test system in a karst area.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Example 1
As shown in fig. 1-2, an indoor test system for a rotary cast-in-place pile in a karst area is provided, and comprises a main body frame with a cross beam 1 and a vertical beam 2, and a base placed below the cross beam 1, wherein a fixed pulley 4 is arranged on the lower surface of the cross beam 1; 3 upper surfaces of base are provided with circular blind hole, and it has fixed pipe 5 to peg graft in the circular blind hole, and fixed pipe 5 endotheca is equipped with first sleeve 6, and first sleeve 6 endotheca is equipped with second sleeve 7, has the clearance that can fill the rubble between first sleeve 6 and the second sleeve 7, and the system still includes motor 8 and the pulling force rope 9 of being connected with motor 8, and the pulling force rope 9 other end is walked around fixed pulley 4 and is connected first sleeve 6.
Before the experiment, a cement base 3 with the diameter of 700mm x 300mm is poured, and a circular blind hole with the diameter of 90mm and the height of 100mm is reserved in the middle. Placing the poured cement base below the beam 1, inserting the fixing pipe 5 into the round blind hole, and pouring cement slurry around the fixing pipe, wherein the outer diameter and the inner diameter of the fixing pipe are respectively 90mm and 80 mm. A first sleeve 6 with the length of 85cm and the diameter of 75mm and a second sleeve 7 with the length of 75cm and the diameter of 50mm are respectively inserted into the fixed pipe, the pipe thickness of the second sleeve is 3.7mm, the pile body is simulated by the pipe thickness, and the fixed pulley is fixed at the top end of the reaction frame. When the pipe drawing experiment is started, the device is firstly installed according to the above steps, broken stones with the diameter of 3mm are poured between the first sleeve 6 and the second sleeve 7, and the motor 8 is turned on to slowly draw out the first sleeve 6 while the broken stones are poured. The adding method of the broken stones can be that the broken stones are manually and directly poured into the gap between the first sleeve 6 and the second sleeve 7, or the broken stones are added into pouring devices such as a funnel in advance to finish pouring. The tension rope 9 generally adopts a rope without elasticity, so that the problem that the accuracy of the test is influenced by the inconsistent pulling speed of the first sleeve 6 in the pulling process due to the elastic action of the tension rope when the motor 8 works is avoided. The speed of extracting the first sleeve 6 can be controlled through the funnel toward the stepless speed change motor 8, the rotary cast-in-place pile in the karst area is directly simulated by the pipe extracting process and the loading process, the pipe extracting process and the loading process of the rotary cast-in-place pile are effectively combined together, the experimental procedures are effectively reduced, and the experimental efficiency is improved.
Example 2
The indoor test system for the rotary cast-in-place pile in the karst area comprises a main body frame with a cross beam 1 and a vertical beam 2 and a base arranged below the cross beam 1, wherein a fixed pulley 4 is arranged on the lower surface of the cross beam 1; the upper surface of the base 3 is provided with a circular blind hole, a fixed pipe 5 is inserted in the circular blind hole, a first sleeve 6 is sleeved in the fixed pipe 5, a second sleeve 7 is sleeved in the first sleeve 6, a gap capable of being filled with broken stones exists between the first sleeve 6 and the second sleeve 7, the system further comprises a motor 8 and a tension rope 9 connected with the motor 8, and the other end of the tension rope 9 is wound around the fixed pulley 4 to be connected with the first sleeve 6.
The difference of embodiment 2 is that not only one communication pipe 10 is connected to the pipeline on the outer wall of fixed pipe 5, but also a piston 11 is provided on the port of communication pipe 10 far from fixed pipe 5, and the accommodation size of communication pipe 10 is adjusted by piston 11. The outer wall of fixed pipe 5 specifically can set up two sets of not unidimensional communicating pipes 10, and communicating pipe and fixed pipe switch on and are connected. In order to increase the test effect, a plurality of communication pipes 10 of the same size and at different heights may be provided. A piston is arranged in the communicating pipe, and the accommodating space of the communicating pipe 10 is adjusted by controlling the relative depth of the piston 11 in the communicating pipe 10. A communicating pipe 10 is arranged on the fixed pipe 5, the communicating pipe 10 is used as a simulated karst cave, and meanwhile, the effect of controlling the karst cave is achieved through a piston 11. To further facilitate the control of the size of the cavern, the communicating pipe 10 may be a transparent pipe in order to prepare for adjusting the accommodation size of the cavern.
In this embodiment, an internal thread may be provided on the inner wall of the communication pipe 10, and the piston 11 may be a bolt that is matched with the internal thread. Through the screw thread design, as long as can adjust the accommodation space, simple and practical of communicating pipe 10 through rotatory bolt.
Example 3
The indoor test system for the rotary cast-in-place pile in the karst area comprises a main body frame with a cross beam 1 and a vertical beam 2 and a base arranged below the cross beam 1, wherein a fixed pulley 4 is arranged on the lower surface of the cross beam 1; the upper surface of the base 3 is provided with a circular blind hole, a fixed pipe 5 is inserted in the circular blind hole, a first sleeve 6 is sleeved in the fixed pipe 5, a second sleeve 7 is sleeved in the first sleeve 6, a gap capable of being filled with broken stones exists between the first sleeve 6 and the second sleeve 7, the system further comprises a motor 8 and a tension rope 9 connected with the motor 8, and the other end of the tension rope 9 is wound around the fixed pulley 4 to be connected with the first sleeve 6.
In order to connect and fix the tension rope 9 and the first sleeve 6 conveniently, a first through hole may be formed in the outer wall of the top of the first sleeve 7, and the tension rope 9 penetrates through the through hole to be fixedly connected with the first sleeve 6. First through-hole can the symmetry set up on first sleeve 6, and the pulling force rope passes the first through-hole of two symmetrical designs simultaneously to guarantee that first sleeve 6 can be vertical motion under the pulling force effect of pulling force rope. Meanwhile, in order to prevent the fixed pipe 5 from inclining or even collapsing due to the stay cord process, the anchor bolts 12 may be symmetrically disposed on the upper surface of the base 3, and the anchor bolts 12 are connected to the fixed pipe 5 through the support rod 120. Protective supports are symmetrically designed on two sides of the fixed pipe 5, so that the stability of the system structure is guaranteed.
Meanwhile, in order to facilitate installation and protection of the motor 8, a motor mounting bracket 80 may be disposed on the ground, and the motor 8 is disposed on the motor mounting bracket 80.
Example 4
The indoor test system for the rotary cast-in-place pile in the karst area comprises a main body frame with a cross beam 1 and a vertical beam 2, and a base arranged below the cross beam 1, wherein a fixed pulley 4 is arranged on the lower surface of the cross beam 1; the upper surface of the base 3 is provided with a circular blind hole, a fixed pipe 5 is inserted in the circular blind hole, a first sleeve 6 is sleeved in the fixed pipe 5, a second sleeve 7 is sleeved in the first sleeve 6, a gap capable of being filled with broken stones exists between the first sleeve 6 and the second sleeve 7, the system further comprises a motor 8 and a tension rope 9 connected with the motor 8, and the other end of the tension rope 9 is wound around the fixed pulley 4 to be connected with the first sleeve 6.
After the pipe drawing experiment is completed, the fixed pulley is removed, the cross beam of the reaction frame is adjusted to a proper height, the fixed pulley 4 is removed at the moment, the load sensor 13, the hydraulic jack 14, the magnetic base 15 and the dial indicator 16 connected with the magnetic base 15 are installed on the cross beam 1, and meanwhile, the strain gauge connected with the dial indicator 16 is arranged in the second sleeve 7, so that a P-S curve of the bearing capacity of the pile body and the lateral friction resistance value of the pile body can be obtained, the bearing capacity mechanism of the pile under the working condition is known and analyzed, and the pile bearing capacity test research is laid for the follow-up lateral pot-shaped karst condition formed by similar material proportioning. Load sensor 13, hydraulic jack 14 connect second sleeve pipe 7 upper surface for different test pressure can be accurate to act on second sleeve pipe 7, improve the degree of accuracy of test data.
Strain gauge: the working principle is based on the strain effect, that is, when a conductor or a semiconductor material is mechanically deformed under the action of external force, the resistance value of the conductor or the semiconductor material is correspondingly changed, and the phenomenon is called the strain effect.
The semiconductor strain gauge is made of a semiconductor material, and the working principle of the semiconductor strain gauge is based on the piezoresistive effect of the semiconductor material. The piezoresistive effect is a phenomenon that when a semiconductor material is subjected to an external force in a certain axial direction, the resistivity of the semiconductor material changes. The strain gauge is an element for measuring strain, which is composed of a sensitive grid and the like, when in use, the strain gauge is firmly adhered to a measuring point of a member, after the member is stressed, the resistance of the sensitive grid is changed along with the deformation of the measuring point due to the strain of the measuring point, and then the resistance change is measured by a special instrument and converted into a strain value of the measuring point. The metal resistance strain gauges are various in variety and form, and commonly include wire type resistance strain gauges and foil type resistance strain gauges. The foil type resistance strain gauge is a sensitive element which is made based on the strain resistance effect, uses metal foil as a sensitive grid and can convert the strain quantity of a tested piece into the resistance variation quantity.
In this embodiment, a loading cover having a through hole is disposed on the top of the second casing 7, a connection line of the strain gauge passes through the through hole to be connected with the dial indicator 16, and the load sensor 13 and the hydraulic jack 14 are connected with the loading cover. Through the design of foraminiferous loading lid, make things convenient for the left side line of foil gage, avoid destroying the connecting wire of foil gage in the course of working. The loading cap may be designed to include a first cylinder and a second cylinder, which are coaxial, wherein the first cylinder abuts against the upper surface of the second protection tube 7, and the second cylinder is disposed inside the cavity of the second protection tube 7.
Example 5
The indoor test system for the rotary cast-in-place pile in the karst area comprises a main body frame with a cross beam 1 and a vertical beam 2, and a base arranged below the cross beam 1, wherein a fixed pulley 4 is arranged on the lower surface of the cross beam 1; the upper surface of the base 3 is provided with a circular blind hole, a fixed pipe 5 is inserted in the circular blind hole, a first sleeve 6 is sleeved in the fixed pipe 5, a second sleeve 7 is sleeved in the first sleeve 6, a gap capable of being filled with broken stones exists between the first sleeve 6 and the second sleeve 7, the system further comprises a motor 8 and a tension rope 9 connected with the motor 8, and the other end of the tension rope 9 is wound around the fixed pulley 4 to be connected with the first sleeve 6.
In this embodiment, one base 3 may be made of cement and the fixing tube 5 may be a steel tube. Fixed pipe adopts 5 structures of steel pipe, non-deformable for entire system structure is more stable, simultaneously, will fix pipe 4 and insert circular blind hole after, still can pour by the grout on the periphery between fixed pipe 4 and the base 3, thereby further stabilize the upright state of fixed pipe 4. Meanwhile, in order to further save the cost, the first sleeve 6 is a PVC pipe, and the second sleeve 7 is a UPVC pipe. PVC pipe and UPVC pipe are common pipeline on the market, and price is preferential and the purchase is convenient, and when processing it in order to satisfy this system size demand, processing is convenient.
It should be understood that the above-mentioned embodiments are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An indoor test system for a rotary cast-in-place pile in a karst area is characterized by comprising a main body frame with a cross beam and a vertical beam, and a base arranged below the cross beam, wherein a fixed pulley is arranged on the lower surface of the cross beam; the base upper surface is provided with circular blind hole, it has fixed pipe to peg graft in the circular blind hole, the fixed pipe endotheca is equipped with first sleeve pipe, first sleeve pipe endotheca is equipped with the second sleeve pipe, has the clearance that can fill the rubble between first sleeve pipe and the second sleeve pipe, the system still includes the motor and the pulling force rope of being connected with the motor, the pulling force rope other end is walked around the fixed pulley is connected first sleeve pipe.
2. The indoor test system for the rotary cast-in-place pile in the karst area as claimed in claim 1, wherein the fixed pipe is connected to the outer wall of the fixed pipe through a pipeline, a piston is arranged at a port of the communicating pipe far away from the fixed pipe, and the accommodating size of the communicating pipe is adjusted through the piston.
3. The indoor test system for the rotary cast-in-place piles in the karst areas as claimed in claim 2, wherein the inner wall of the communicating pipe is provided with internal threads, and the piston is a bolt matched with the internal threads.
4. The indoor test system for the slewing cast-in-place pile in the karst area as claimed in claim 1, wherein a first through hole is formed in an outer wall of the top of the first casing, and the tension rope penetrates through the first through hole to be fixedly connected with the first casing.
5. The indoor test system for the rotary cast-in-place pile in the karst area as claimed in claim 1, wherein anchor bolts are symmetrically arranged on the upper surface of the base and connected with the fixing tube through a support rod.
6. The indoor testing system for the slewing cast-in-place piles in the karst areas according to claim 1, wherein a load sensor, a hydraulic jack, a magnetic base and a dial indicator connected with the magnetic base are arranged on the lower surface of the cross beam; and a strain gauge connected with a dial indicator is arranged in the second sleeve, and the load sensor and the hydraulic jack are connected with the upper surface of the second sleeve.
7. The indoor test system for the slewing cast-in-place pile in the karst area as claimed in claim 6, wherein a loading cover with a second through hole is arranged on the top of the second sleeve, a connecting line of the strain gauge penetrates through the second through hole to be connected with a dial indicator, and the loading sensor and the hydraulic jack are connected with the loading cover.
8. The system of claim 7, wherein the loading cap comprises a first cylinder and a second cylinder, the first cylinder and the second cylinder being coaxial, the first cylinder abutting against an upper surface of the second casing, the second cylinder being disposed within a cavity of the second casing.
9. The indoor test system for the slewing cast-in-place pile in the karst region according to any one of claims 1 to 8, wherein the fixed pipe is a steel pipe.
10. The indoor test system for the rotary cast-in-place pile in the karst area according to any one of claims 1 to 8, wherein the first sleeve is a PVC pipe, and the second sleeve is a UPVC pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220620544.8U CN217267692U (en) | 2022-03-21 | 2022-03-21 | Indoor test system for rotary cast-in-place pile in karst area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202220620544.8U CN217267692U (en) | 2022-03-21 | 2022-03-21 | Indoor test system for rotary cast-in-place pile in karst area |
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| CN217267692U true CN217267692U (en) | 2022-08-23 |
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| CN202220620544.8U Active CN217267692U (en) | 2022-03-21 | 2022-03-21 | Indoor test system for rotary cast-in-place pile in karst area |
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