Probe rod for static sounding

Abstract

The probe rod comprises a first section of probe rod body, a second section of probe rod body and a probe rod middle joint which is in threaded connection with the first section of probe rod body and the second section of probe rod body, the two ends of the probe rod middle connector are provided with a threaded connection section and a transition section which are matched with probe rod internal threads respectively, the upper end of the first probe rod body and the lower end of the second probe rod body are connected with a male buckle connector and a female buckle connector in a threaded mode, and the male buckle connector and the female buckle connector are matched in a threaded mode so that adjacent probe rods can be connected. Compared with a traditional probe rod body, the thickness of the wall at the connecting position of the probe rod body is obviously increased, the strength of a probe rod connector is effectively improved, and the situation that the probe rod connector is broken off from the connector due to too large pressure is prevented. Meanwhile, the contact area of the feeler lever and the stratum is reduced, the frictional resistance is reduced, and therefore the penetration capacity of the feeler lever is improved, the guidance quality of the feeler lever in the stratum penetration process is enhanced, and bending and breaking are prevented. And in cooperation with an automatic probe rod clamping assembly, automatic clamping can be achieved, and slipping of a sliding rod is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of static cone penetration, and particularly relates to a drill rod for static cone penetration. Background Art

[0002] In the technical field of geotechnical engineering investigation, static cone penetration, as an important in-situ testing method, is widely used in the evaluation of the comprehensive mechanical properties of foundation soil. This technology uses a pressure device such as a hydraulic cylinder to continuously press a static cone penetration probe into the formation through a drill rod in contact, and simultaneously measures parameters such as the tip resistance and sidewall friction resistance of the formation against the probe to determine physical and mechanical indexes such as the compression modulus and bearing capacity of the formation, which is an in-situ testing method.

[0003] The static cone penetration drill rod is generally processed from high-strength seamless steel pipes, with male and female joints at both ends respectively, and is an integral structure. The steel pipe is hollow for installing a test cable, and the effective length after removing the length of the male thread is 1m. The diameters of the static cone penetration drill rods are generally standard specifications of 36mm, 40mm, and 42mm, and the wall thickness is generally 8 - 12mm. The smaller the wall thickness of the drill rod, the thinner the wall of the joint after processing, and it is easy to cause the drill rod to break at the root of the male thread during penetration, thus reducing the overall strength and service life of the drill rod. In addition, the larger the diameter of the drill rod, the greater the frictional resistance between the drill rod and the formation during static cone penetration, and the deeper it is, the greater the resistance. Larger penetration force equipment is required to press the drill rod into the formation. Therefore, a reamer is generally installed behind the static cone penetration probe. The diameter of the reamer is larger than that of the drill rod, which is used to reduce the frictional resistance of the drill rod during static cone penetration. However, due to the existence of the reamer, the guiding property of the drill rod is poor, and it is easy to bend and break under force.

[0004] Currently, a hydraulic double cylinder is generally used as the static cone penetration equipment. The cross beam on the two piston rods of the cylinder drives the press-in or extraction of the drill rod, and the stroke of the cylinder is 0.5m. The cooperation between the cross beam and the drill rod generally adopts two methods to clamp the drill rod:

[0005] 1. The chuck type is adopted, that is, the drill rod is clamped by the relative movement of the chuck and the cross beam. When the formation is relatively hard and the penetration force is large, the drill rod is prone to slipping or surface scratching and other defects. This not only reduces the operation efficiency but also may damage the drill rod, thereby affecting its subsequent use performance and service life;

[0006] 2. The clamping plate type means that two pairs of clamping grooves are set on the surface of the sounding rod, with a spacing of 0.5 m. After adjacent sounding rods are connected, there will be a pair of clamping grooves every 0.5 m for inserting the clamping plate. The oil cylinder crossbeam drives the clamping plate to realize the pressing-in or pulling-out of the sounding rod. There are two deficiencies in this method. First, since the clamping grooves are milled on the surface of the sounding rod, the strength of the sounding rod is reduced, and it is easy to break at the clamping grooves during sounding. Second, both inserting and removing the clamping plate require manual operation, which increases the labor intensity and there is also a risk of pinching hands.

[0007] Therefore, in view of the above problems and deficiencies existing in the prior art, the present utility model aims to provide a static cone penetration sounding rod applicable to a hydraulic double cylinder with a stroke of 0.5 m, which is easy to automatically clamp and has high strength, so as to overcome the limitations of the prior art and meet the requirements of practical applications. Content of the utility model

[0008] In view of the problems existing in the prior art, the present utility model provides a sounding rod for static cone penetration with high strength and easy to penetrate or pull out.

[0009] The present utility model is realized as follows. A sounding rod for static cone penetration, characterized in that: the sounding rod includes a first section of sounding rod body, a second section of sounding rod body, and an intermediate joint that threadedly connects the first section of sounding rod body and the second section of sounding rod body; both ends of the intermediate joint of the sounding rod are provided with a threaded connection section and a transition section that respectively cooperate with the internal thread of the sounding rod. The upper end of the first section of sounding rod body and the lower end of the second section of sounding rod body are threadedly connected with a female coupling joint and a male coupling joint. The male coupling joint and the female coupling joint are in threaded cooperation, which can realize the connection of adjacent sounding rods and form a joint with the same shape, size and intermediate transition section as the intermediate transition section. The distance between its upper edge or lower edge and the upper edge or lower edge of the transition section of the intermediate joint is 0.5 m.

[0010] Preferably, the outer diameter of the transition section is larger than the outer diameters of the first and second sounding rod bodies, and both ends of the transition section are provided with tapered clamping surfaces, and the small diameter of the tapered clamping surface is equal to the outer diameter of the sounding rod.

[0011] Preferably, the male coupling joint and the female coupling joint are provided with tapered clamping surfaces on the side connected to the first section of sounding rod body or the second body.

[0012] Preferably, the male coupling joint and the female coupling joint are tapered coarse pitch threads that cooperate with each other.

[0013] Preferably, the threads at the upper end of the first section of sounding rod body and the second section of sounding rod body connected to the female coupling joint and the male coupling joint are fine pitch straight threads.

[0014] Advantages and technical effects of the present utility model: The wall thickness of the intermediate joint, male threaded joint and female threaded joint of the probe rod of the present utility model is greater than that of the traditional probe rod body, effectively increasing the strength of the probe rod joint, preventing the probe rod from being over-pressed and breaking at the joint; Since the outer diameter of the intermediate joint, male threaded joint and female threaded joint of the probe rod is greater than the outer diameter of the probe rod body, the contact area between the probe rod and the formation is reduced, the frictional resistance between the probe rod and the formation is reduced, and the penetration ability of the sounding is improved; At the same time, the guiding property of the probe rod during the penetration of the formation is also increased, preventing the probe rod from bending and breaking; In addition, the probe rod can be automatically clamped in cooperation with the probe rod automatic clamping assembly, and the phenomenon of the probe rod slipping will not occur. Brief Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Figure 2 is a schematic structural diagram of the intermediate joint of the probe rod;

[0017] Figure 3 is a diagram of the use state of the present utility model;

[0018] Figure 4 is Figure 3 top view of;

[0019] Figure 5 is a diagram of the cooperation state of the present utility model and the probe rod automatic clamping assembly;

[0020] Figure 6 is a schematic structural diagram of a semi-conical clamping sleeve monomer.

[0021] 100. Probe rod; 101. First section of probe rod body; 102. Second section of probe rod body; 103. Male threaded joint; 104. Female threaded joint; 105. Conical clamping surface; 1. Intermediate joint of probe rod; 11. Threaded connection section; 12. Transition section; 13. Conical clamping surface; 2. Moving beam; 21. Probe rod placement hole; 3. Clamping sleeve; 32. Clamping sleeve monomer; 33. Anti-slip groove; 34. Conical clamping surface; 4. Reset assembly; 41. Movable sleeve, 42. Guide rod, 43. Reset spring; 44. Lower locking nut; 45. Rainproof nut; 46. Lower limit clamping plate; 47. Upper limit clamping plate; 5. Oil cylinder. Detailed Embodiments

[0022] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0023] Please refer to Figure Figures 1 to 2, A sounding rod for static cone penetration test, the sounding rod 100 includes a first sounding rod body 101, a second sounding rod body 102, and a sounding rod intermediate joint 1 that threadedly connects the first sounding rod body and the second sounding rod body; the sounding rod intermediate joint 1 is composed of a threaded connection section 11 and a transition section 12 provided at both ends and respectively matched with the internal thread of the sounding rod. The upper end of the first sounding rod body and the lower end of the second sounding rod body are threadedly connected with a female coupling joint 104 and a male coupling joint 103. The threaded cooperation between the male coupling joint 103 and the female coupling joint 104 can realize the connection of adjacent sounding rods. And a joint is formed with the same shape and size as the intermediate transition section, and the distance between its upper edge or lower edge and the upper edge or lower edge of the intermediate joint transition section is 0.5 m.

[0024] Preferably, the outer diameter of the transition section 12 is larger than the outer diameter of the sounding rod body, and tapered clamping surfaces 13 are provided at both ends of the transition section 12, and the small diameter of the tapered clamping surfaces 13 is equal to the outer diameter of the sounding rod.

[0025] Preferably, tapered clamping surfaces 105 are provided on the connection sides of the male coupling joint 103 and the female coupling joint 104 with the first sounding rod body or the second body.

[0026] Preferably, the male coupling joint 103 and the female coupling joint 104 are coarse-threaded tapered threads that cooperate with each other for easy disassembly.

[0027] Preferably, the threads of the upper end of the first sounding rod body and the second sounding rod body connected to the male coupling joint 103 and the female coupling joint 104 are fine-threaded straight threads, which mainly realize threaded connection and ensure connection strength.

[0028] When performing static cone penetration test, the present utility model realizes the penetration and extraction tests in cooperation with a sounding rod automatic clamping assembly; please refer to Figures 3 to 6 , its sounding rod automatic clamping assembly includes a moving beam 2 that drives the sounding rod to move up and down. Two tapered sounding rod placement holes 21 that are radially symmetric are provided at the center of the moving beam 2. A clamping sleeve 3 that cooperates with the sounding rod placement holes 21 is placed in the sounding rod placement holes 21. The moving beam 2 drives the sounding rod to perform penetration or extraction operations through its up and down movement. The cooperation between the tapered sounding rod placement holes 21 and the clamping sleeve 3 can ensure the stable placement of the sounding rod in the moving beam 2, and through the clamping action of the clamping sleeve 3, the stable clamping of the sounding rod is realized.

[0029] Vertical counterbores are provided on both sides of the sounding rod placement holes 21, and a reset assembly 4 is installed in the counterbores. When the moving beam 2 moves up or down, the reset member makes the clamping sleeve clamp the sounding rod. The presence of the reset assembly 4 ensures that during the movement of the moving beam 2, the clamping sleeve 3 can maintain a stable clamping state with the sounding rod, preventing the clamping sleeve 3 from disengaging from the sounding rod placement holes 21 due to external forces, thereby ensuring the stability of the sounding rod and the operation efficiency.

[0030] The elastic reset component 4 includes a movable sleeve 41 and a guide rod 42 installed inside the movable sleeve 41. A reset spring 43 is provided between the guide rod 42 and the bottom of the movable sleeve 41. The lower end of the guide rod 42 extends out of the moving beam 2, and a lower locking nut 44 is equipped on the guide rod 42 below the moving beam 2; the upper part of the movable sleeve 41 extends out of the moving beam 2, and an upper locking nut is screwed on the movable sleeve 41 above the moving beam 2. The upper locking nut is preferably a rainproof nut 45. A lower limit card plate 46 is provided between the lower locking nut 44 and the moving beam 2; an upper limit card plate 47 is provided between the rainproof nut 45 and the moving beam 2. Due to the action of the reset spring 43, the movable sleeve 41 and the guide rod 42 of the elastic reset component 4 can automatically return to the original position after being acted on by an external force. The settings of the locking nut 44, the rainproof nut 45, the lower limit card plate 46 and the upper limit card plate 47 ensure the precise control of the movement of the movable sleeve 41, thereby ensuring that the clamping force of the clamping sleeve 3 on the probe rod is moderate and stable.

[0031] Preferably, the lower limit card plate and the upper limit card plate are oblong, and one end is provided with a mounting hole 48.

[0032] More preferably, the inner holes at both the large-diameter and small-diameter ends of the clamping sleeve are provided with tapered clamping surfaces 34, which are beneficial to the guiding and threading of the probe rod and ensure concentricity during clamping.

[0033] The clamping sleeve 3 is of a split structure and includes two semi-conical clamping sleeve monomers 32 with the same structure. The split structure makes it more convenient for the clamping sleeve 3 to be installed and disassembled.

[0034] The inner surface of the clamping sleeve 3 is provided with anti-slip grooves 33. The design of the anti-slip grooves 33 increases the friction between the clamping sleeve 3 and the probe rod, making the clamping more stable and reliable, and effectively preventing the clamping failure problem caused by the probe rod sliding during penetration or extraction.

[0035] The usage method of this probe rod for cone penetration test: When lifting the probe rod, place the clamping sleeve in the placement hole on the moving beam, and use the reset component to tightly hold the clamping sleeve.

[0036] When the lower conical surface of the transition joint on the probe rod matches with the large inner conical surface of the clamping sleeve, and the outer conical surface of the clamping sleeve matches with the upper conical surface of the probe rod placement hole, the probe rod is clamped. The probe rod is lifted up along with the rise of the oil cylinder 5. After reaching the maximum stroke, the pneumatic or hydraulic clamp on the oil cylinder base clamps the probe rod to prevent it from slipping. Then the oil cylinder piston rod retracts, the probe rod does not move, and the clamping sleeve on the moving beam is separated from the probe rod. Due to the action of the reset component, the clamping sleeve and the moving beam move down together with the oil cylinder piston rod. When encountering the transition joint (or the transition joint composed of the male joint of the probe rod and the female joint of another probe rod), the probe rod is lifted up and the maximum stroke is reached. When the upper edge of the transition joint is reached, the clamping sleeve is driven to move upward, and the reset assembly is stretched upward until the inner diameter of the clamping sleeve is adapted to the large diameter of the transition section. When the cylinder piston rod is fully retracted, the lower conical surface of the transition section of the probe rod just matches the large inner conical surface of the clamping sleeve. At this time, the pneumatic or hydraulic clamp on the cylinder base is released, the oil circuit of the cylinder is switched, and the cylinder piston rod drives the moving beam to rise. The clamping sleeve and the reset assembly in the moving beam move downward and clamp the probe rod. The large inner conical surface of the clamping sleeve pushes the lower conical surface of the transition joint of the probe rod, so that the probe rod rises together with the cylinder piston rod. The redundant probe rod is removed in time during the rising process of the probe rod. This reciprocating process realizes the gradual lifting of the probe rod.

[0037] When the lower cone surface of the transition joint on the probe rod does not match the large inner cone surface of the clamping sleeve, the inner diameter of the clamping sleeve can also clamp the probe rod. When the pull force on the probe rod is not large, the probe rod can also rise with the moving beam. When the moving beam rises to the highest point, it starts to descend, and the process is the same as above.

[0038] When the probe rod is pressed down, the clamping sleeve is placed in the probe rod placement hole under the moving beam. At this time, the large inner cone of the clamping sleeve is at the bottom. The clamping sleeve is supported by the reset assembly so that the inside of the clamping sleeve is against the probe rod and the outside is against the probe rod placement hole. Start the cylinder, move the beam downward, and the probe rod and the clamping sleeve have two positional relationships. There are two situations:

[0039] In the first case, when the large inner cone surface of the clamping sleeve does not abut against the cone surface on the transition joint of the probe rod, the clamping sleeve and the placement hole move relative to each other, the clamping sleeve clamps and drives the probe rod downward. This situation is suitable for softer formations. When encountering harder formations, when the friction between the clamping sleeve and the probe rod is less than the reaction force of the probe rod, the clamping sleeve and the probe rod will move relative to each other (slip), so the downward pressure of the probe rod cannot be guaranteed;

[0040] In the second case, when the large inner cone surface of the clamping sleeve abuts against the cone surface on the transition joint of the probe rod, the probe rod drives the clamping sleeve to move upward relatively in the placement hole, and the outer cone surface of the clamping sleeve abuts against the cone surface of the placement hole to clamp the clamping sleeve and drive the probe rod downward. In this case, no matter how soft or hard the formation is, relative movement (slipping) between the clamping sleeve and the probe rod will not occur.

[0041] When the oil cylinder piston rod is fully retracted and the moving crossbeam reaches the lowest position, the oil circuit of the oil cylinder is reversed, and the piston rod drives the moving crossbeam to start rising. The clamping sleeve inside the moving crossbeam will move downward relatively, and the reset assembly keeps the clamping sleeve and the probe rod in a loose contact state. The probe rod remains stationary while the moving crossbeam rises. When encountering the lower conical surface of the adapter, the clamping sleeve inside the moving crossbeam will continue to move downward until the large diameter of the adapter passes through the clamping sleeve, while stretching the reset assembly. When the adapter completely passes through the clamping sleeve and the large inner conical table of the clamping sleeve abuts against the upper conical surface of the adapter, the moving crossbeam also reaches the highest position. At this time, the oil circuit of the oil cylinder is reversed again, and the clamping sleeve in the moving crossbeam clamps the probe rod, and then starts to descend with the moving crossbeam. During the descent of the probe rod, the probe rod is timely connected. By repeating this process, the penetration test operation is realized.

[0042] In summary, the utility model can cooperate with the clamping sleeve by adding an intermediate joint of the probe rod to avoid the problem of slipping due to insufficient clamping force. At the same time, adding the elastic reset assembly can realize the penetration or extraction operation of the probe rod. The above-mentioned automatic probe rod clamping assembly has the advantages of reasonable structure, stable clamping, strong adaptability, simple operation, safety and reliability, etc., and can meet the high-efficiency clamping requirements of the probe rod during penetration or extraction.

[0043] The above are only the preferred embodiments of the utility model and are not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the utility model shall be included within the protection scope of the utility model.

Claims

1. A sounding rod for static cone penetration, characterized in that: The probe rod includes a first-section probe rod body, a second-section probe rod body, and a probe rod intermediate joint that threadedly connects the first-section probe rod body and the second-section probe rod body; the probe rod intermediate joint is composed of threaded connection sections and transition sections provided at both ends and respectively matched with the internal threads of the probe rod. The upper end of the first-section probe rod body and the lower end of the second-section probe rod body are threadedly connected to a female coupling joint and a male coupling joint. The threaded fit between the male coupling joint and the female coupling joint can achieve the connection of adjacent probe rods.

2. The sounding rod for static cone penetration according to claim 1, characterized in that: The outer diameter of the transition section is larger than the outer diameters of the first and second probe rod bodies, and tapered clamping surfaces are provided at both ends of the transition section. The minor diameter of the tapered clamping surface is equal to the outer diameters of the first and second probe rod bodies.

3. The sounding rod for static cone penetration according to claim 1, wherein: Tapered clamping surfaces are provided on the connection sides of the male coupling joint and the female coupling joint with the first-section probe rod body or the second-section body, and the outer shape of the male coupling joint and the female coupling joint after connection is the same as the outer shape of the transition section of the intermediate joint.

4. The sounding rod for static cone penetration according to claim 1, characterized in that: The male coupling joint and the female coupling joint are tapered coarse-thread threads that cooperate with each other.

5. The sounding rod for static cone penetration according to claim 1, wherein: The threads for connecting the upper end of the first-section probe rod body and the second-section probe rod body with the male coupling joint and the female coupling joint are fine-pitch straight threads.

Images