A foundation strength detection device for building construction

Abstract

The present invention relates to a foundation detection device, and in particular to a foundation strength detection device for construction. It comprises a steel drill body, a core hammer, and a handle. The core hammer is slidably mounted on the steel drill body, and a handle is provided on the outside of the core hammer. The device is characterized in that it further comprises a limit device and an automatic reversing mechanism. A groove extending along the length of the steel drill body is provided on the side thereof, and a rectangular groove is provided at an eccentric position of the core hammer, which is connected to the center hole of the core hammer. The present invention achieves the one-way lifting, locking, and automatic release functions of the core hammer through the coordinated cooperation of the limit device and the automatic reversing mechanism. When the core hammer does not reach the standard height, the wedge block can automatically fit into the gap between the inverted trapezoidal blocks to prevent it from falling prematurely. When it is lifted to the set height, the automatic reversing mechanism rotates the wedge block and disengages the limit area, ensuring that the core hammer freely falls and hits the steel drill body at the standard height, ensuring that the energy of each impact is consistent.

Description

Technical Field

[0001] The present invention relates to a foundation detection device, in particular to a foundation strength detection device for building construction. Background Art

[0002] During construction, foundation strength is a key factor in ensuring building stability and safety. To accurately assess the foundation's bearing capacity, on-site testing is often necessary. Common foundation strength testing methods include static penetration testing and dynamic penetration testing. Dynamic penetration testing is widely used due to its ease of use and low cost.

[0003] Traditional dynamic penetration devices generally consist of a steel drill, a core hammer, and a handle. The operator manually raises the core hammer to a certain height and then releases it, causing it to fall freely and strike the steel drill. This impact force is then transmitted to the foundation, and the foundation strength is assessed by recording the depth or number of penetrations of the steel drill. However, this traditional device has many shortcomings. For example, in actual operation, due to human factors, it is difficult to maintain a consistent height for the core hammer, resulting in poor repeatability and accuracy in test results. Furthermore, if the core hammer is released prematurely during the lifting process, it can easily result in insufficient impact energy, affecting the validity of the test data. Summary of the Invention

[0004] In order to overcome the disadvantage that it is difficult to maintain a consistent lifting height of the core hammer, resulting in poor repeatability of the detection results, the present invention provides a foundation strength detection device for construction.

[0005] A foundation strength detection device for construction, comprising a steel drill body, a core hammer and a handle, wherein the core hammer is slidably arranged on the steel drill body, and a handle is arranged on the outside of the core hammer, characterized in that: it also includes a limit device and an automatic reversing mechanism, the side of the steel drill body is provided with a groove extending along its length direction, the core hammer is provided with a rectangular groove at an eccentric position, and the rectangular groove is connected to the center hole of the core hammer; the limit device is arranged between the steel drill body and the core hammer, and comprises an inverted trapezoidal block, an elastic connecting piece and a wedge block, and the groove is provided on both sides of the length direction. A row of inverted trapezoidal blocks is respectively provided, a gap is left between two adjacent inverted trapezoidal blocks in the same row, and a gap is left between the two rows of inverted trapezoidal blocks for the wedge block to pass through; the upper part of the rectangular groove of the core drilling hammer is connected to the wedge block through an elastic connecting piece; the automatic reversing mechanism is arranged between the steel drill body and the limit device, and is used to drive the wedge block to rotate 90 degrees when the wedge block rises to the upper end position of the groove with the core drilling hammer, so that it is directly above the gap between the two rows of inverted trapezoidal blocks, and when the wedge block falls to the lower end position of the groove with the core drilling hammer, it drives the wedge block to rotate 90 degrees in the opposite direction to reset.

[0006] Further explanation: the elastic connecting part includes a sleeve, a rotating shaft and a first elastic part. The sleeve is connected to the inner wall of the core hammer; one end of the rotating shaft is connected to the wedge block, and the other end is inserted into the sleeve and realizes rotation and sliding cooperation with the sleeve. A first elastic part is provided inside the sleeve, and the rotating shaft is elastically connected to the core hammer through the first elastic part.

[0007] Further explanation: the automatic reversing mechanism includes a lower gear rod, a first B block, a second B block, an upper gear rod, a spline sleeve and a spline hollow shaft. The upper gear rod and the lower gear rod are respectively connected to the upper and lower sides of the steel drill body. The spline sleeve is connected to the sleeve through a rotating pair. The spline hollow shaft is slidably nested inside the spline sleeve. The spline sleeve and the spline hollow shaft realize axial sliding and circumferential limiting through spline cooperation. The first B block and the second B block are connected to the outside of the spline sleeve. The lower gear rod and the first B block are located on the same axis, and the upper gear rod and the second B block are located on the same axis.

[0008] Further explanation: the elastic connecting member also includes a sliding block and a ball. The sliding block is slidably connected in the sleeve. One end of the sliding block is connected to the first elastic member, and the other end is rotatably installed with a ball. The end of the rotating shaft contacts the ball.

[0009] Further explanation: the foundation strength detection device used in construction also includes a supporting mechanism, which includes a fixing part, a telescopic rod, an insert block and a supporting part. The fixing part is circumferentially connected to multiple telescopic rods, and an insert block is provided at the lower end of the telescopic rod. The telescopic rod is detachably connected to the supporting part through the insert block.

[0010] Further explanation, the fixing part includes a fixing sleeve, an arc-shaped plate, a lever, a first rubber plate and a second rubber plate. A notch is opened on the fixing sleeve, and the inner side of the fixing sleeve is slidably connected to the arc-shaped plate, and the lever is connected to the arc-shaped plate. The inner side of the arc-shaped plate is provided with a first rubber plate that gradually thickens from one end to the other end, and the second rubber plate is provided in the notch of the fixing sleeve.

[0011] Further explanation: the support member includes two semicircular rings hinged to each other, and the top of the semicircular ring is provided with a connecting hole adapted to the plug block. A sliding groove is provided at the opposite ends of the two semicircular rings, and an arc-shaped sliding rod is slidingly connected in the sliding groove. An elastic locking rod is connected to the top of one semicircular ring, and the elastic locking rod is adapted to the connecting hole of the other semicircular ring.

[0012] Further explanation: ground nail holes are provided on the semicircular ring.

[0013] Further description, it also includes a rubber block, wherein a rubber block is set on the top of the semicircular ring on one side.

[0014] Further explanation, the foundation strength detection device used in construction also includes an anti-rotation mechanism, which includes a connecting ring, a guide plate, a guide sleeve, a second elastic member, a locking block, a contact rod, a limiting protrusion, a lower unlocking rod and an upper unlocking rod. The guide plate is connected to the sleeve through a connecting ring, and the guide plate is slidably connected to the guide sleeve. A second elastic member is connected between the guide sleeve and the guide plate, and a locking block is connected to the guide sleeve. The locking block is connected to the contact rod for triggering the unlocking action. Limiting protrusions are provided at circumferential intervals on the outer side of the spline sleeve. The limiting protrusions are used to cooperate with the locking block to limit the rotation of the spline sleeve to prevent it from accidentally rotating in the non-operating state. The lower unlocking rod is connected to the lower stop rod, and the upper unlocking rod is connected to the upper stop rod.

[0015] The beneficial effects of the present invention are as follows: 1. Through the coordinated cooperation of the limit device and the automatic reversing mechanism, the present invention realizes the one-way lifting locking and automatic release functions of the core hammer. When the core hammer has not reached the standard height, the wedge block automatically fits into the gap between the inverted trapezoidal blocks to prevent premature falling. When the core hammer is raised to the set height, the automatic reversing mechanism rotates the wedge block and disengages the limit area, ensuring that the core hammer freely falls at the standard height to impact the steel drill body, ensuring consistent energy each time, and significantly improving the accuracy and repeatability of the test data.

[0016] 2. The support mechanism allows the entire detection device to be securely mounted on the foundation surface without manual support. Three synchronously retractable telescopic rods provide excellent lateral support for the steel drill body, preventing it from tilting or shifting, enhancing the safety and stability of the detection process. Furthermore, the support features a retractable semi-circular ring structure, allowing for quick installation and storage, and flexible and convenient operation.

[0017] 3. The anti-rotation mechanism prevents the spline sleeve from rotating accidentally when not in operation by cooperating with the locking block and the limit protrusion, thereby ensuring the stability of equipment operation; the unlocking rod and the contact rod are linked to achieve automatic unlocking and resetting, ensuring accurate and reliable reversing action. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0019] Figure 2 This is a first partial cross-sectional view of the present invention.

[0020] Figure 3 This is a second partial cross-sectional view of the present invention.

[0021] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0022] Figure 5 for Figure 3 A partial enlarged view of point B in the middle.

[0023] Figure 6 It is a schematic diagram of the local structure of the limit device and automatic reversing mechanism.

[0024] Figure 7 It is a cross-sectional view of the sleeve of the present invention.

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the anti-rotation mechanism of the present invention.

[0026] Figure 9 This is a cross-sectional view of the core hammer of the present invention located on the upper part of the steel drill body.

[0027] Figure 10 for Figure 9 A partial enlarged view of point C in the middle.

[0028] Figure 11 Schematic diagram of the structure of the support mechanism of the present invention.

[0029] Figure 12 It is a schematic diagram of the three-dimensional structure of the fixing member of the present invention.

[0030] Figure 13 It is a schematic diagram of the three-dimensional structure of the arc plate, the shifting rod and the second rubber plate of the present invention.

[0031] Figure 14 It is a schematic diagram of the three-dimensional structure of the support member of the present invention in the expanded state.

[0032] Figure 15 It is a schematic diagram of the three-dimensional structure of the support member of the present invention in a closed state.

[0033] In the above drawings: 1: steel drill body, 11: groove, 2: core hammer, 21: handle, 22: rectangular groove, 3: limit device, 31: inverted trapezoidal block, 32: elastic connecting member, 33: wedge block, 321: sleeve, 322: rotating shaft, 323: first elastic member, 324: sliding block, 325: ball, 4: automatic reversing mechanism, 41: lower stop rod, 42: first b block, 43: second b block, 44: upper stop rod, 45: spline sleeve, 46: spline hollow shaft, 5: anti-rotation mechanism, 51: connecting ring, 52: guide plate, 53: guide sleeve, 54: second elastic member , 55: Locking block, 56: Contact rod, 57: Limiting protrusion, 58: Lower unlocking rod, 59: Upper unlocking rod, 6: Support mechanism, 61: Fixing part, 611: Fixing sleeve, 612: Notch, 613: Arc plate, 614: Push rod, 615: Opening, 616: First rubber plate, 617: Second rubber plate, 618: Limiting pin, 62: Telescopic rod, 63: Insert block, 64: Support part, 641: Semicircular ring, 642: Connecting hole, 643: Slide groove, 644: Arc slide rod, 645: Elastic locking rod, 646: Handle, 647: Ground nail hole, 648: Rubber block. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0035] Example 1: A foundation strength detection device for construction, such as Figure 1-Figure 4 The eccentric position of the core drill 2 is provided with a rectangular groove 22, which is connected to the center hole of the core drill 2. The limiting device 3 is arranged between the upper and lower steel drills and the core drill 2, and the limiting device 3 is arranged between the upper and lower steel drills to limit the movement of the core drill 2. The positioning device 3 includes an inverted trapezoidal block 31, an elastic connector 32 and a wedge block 33. A row of inverted trapezoidal blocks 31 are respectively provided on both sides of the length direction of the groove 11. A gap is left between the two adjacent inverted trapezoidal blocks 31 in the same row. The upper and lower ends of the groove 11 are not provided with inverted trapezoidal blocks 31. A gap is left between the two rows of inverted trapezoidal blocks 31 to facilitate the passage of the wedge block 33. The upper part of the rectangular groove 22 of the core hammer 2 is connected to the wedge block 33 through the elastic connector 32, and the automatic reversing The mechanism 4 is arranged between the upper steel drill and the limit device 3. When the wedge block 33 moves upward to the upper end position of the groove 11, the automatic reversing mechanism 4 drives the wedge block 33 to rotate 90 degrees; so that the wedge block 33 is located just above the gap between the two rows of inverted trapezoidal blocks 31. After releasing the handle 21, the core hammer 2 can fall quickly and hit the limit block. When the wedge block 33 moves downward to the lower end position of the groove 11, the automatic reversing mechanism 4 drives the trapezoidal block to rotate 90 degrees and reset.

[0036] Specifically, when performing a strength test on a foundation, the operator first places the steel drill body 1 in the foundation to be tested, with one person holding it steady. Another person then grasps the handles 21 on either side of the core hammer 2 and lifts the hammer 2 upward. At this point, the core hammer 2 slides upward along the upper steel drill axis. As the core hammer 2 rises, the wedge-shaped block 33 within its rectangular slot 22 is connected by an elastic connector 32 and rises along with the core hammer 2. As the wedge-shaped block 33 rises with the core hammer 2 and passes over the inverted trapezoidal blocks 31, the elastic connector 32 allows the wedge-shaped block 33 to smoothly pass over these inverted trapezoidal blocks 31 without obstruction. If the operator releases the handles 21 before the core hammer 2 has reached the standard height, the wedge-shaped block 33, under the action of the elastic connector 32, automatically embeds itself into the gap between adjacent inverted trapezoidal blocks 31, thereby preventing the core hammer 2 from moving downward. This prevents the accuracy of the test results from being affected by the premature release of the core hammer 2, effectively improving the accuracy and consistency of the test. When the core hammer 2 is lifted to the top of the groove 11, that is, when the wedge block 33 reaches the upper limit position of the groove 11, the automatic reversing mechanism 4 rotates the wedge block 33 90 degrees, turning it from a horizontal state to a vertical state. At this point, the wedge block 33 is located directly above the gap between the two rows of inverted trapezoidal blocks 31 and no longer interferes with the inverted trapezoidal blocks 31. At this time, the handle 21 is released, and the core hammer 2 can fall freely and rapidly under the action of gravity, hitting the limit block, transmitting the impact force to the steel drill body 1, and then acting on the foundation, completing an impact test. When the wedge block 33 falls to the bottom of the groove 11 with the core hammer 2, the automatic reversing mechanism 4 rotates the wedge block 33 in the opposite direction 90 degrees to reset it, returning it to its initial horizontal state, ready for the next lift. This cycle is repeated, and multiple impact tests at standard heights can be performed continuously, ensuring that the testing process is efficient, stable, and repeatable. The device realizes the one-way lifting locking and automatic release functions of the core hammer 2 through the coordinated cooperation of the limit device 3 and the automatic reversing mechanism 4, thereby improving the accuracy and consistency of the detection data.

[0037] Example 2: Based on Example 1, Figure 4 、 Figure 6 and Figure 7 As shown, the elastic connecting member 32 includes a sleeve 321, a rotating shaft 322 and a first elastic member 323. The sleeve 321 is fixedly connected to the inner wall of the core hammer 2 and is located at the upper end inside the rectangular groove 22; one end of the rotating shaft 322 is connected to the wedge block 33, and the other end is inserted into the sleeve 321 and realizes rotation and sliding cooperation with the sleeve 321. A first elastic member 323 is provided inside the sleeve 321. In this embodiment, the first elastic member 323 is a coil spring, and the rotating shaft 322 is elastically connected to the core hammer 2 through the first elastic member 323.

[0038] Specifically, as the core hammer 2 slides upward along the upper steel drill, the inclined surface of the wedge block 33 contacts the inverted trapezoidal block 31, generating a relative force that causes the wedge block 33 and its connected shaft 322 to move rightward, thereby compressing the first elastic member 323 within the sleeve 321. As the core hammer 2 continues to rise and the wedge block 33 passes over the current inverted trapezoidal block 31, the first elastic member 323 recovers its elastic potential energy, pushing the shaft 322 and wedge block 33 back to the left and snapping into the gap between adjacent inverted trapezoidal blocks 31. Therefore, after the operator releases the handle 21, the wedge block 33 automatically limits the position, locking the core hammer 2 in its current position and preventing it from accidentally falling if it fails to reach the set height. This ensures that each impact test meets the standard height requirements and improves the accuracy and consistency of the test results.

[0039] Furthermore, the elastic connecting member 32 also includes a sliding block 324 and a ball 325. The sliding block 324 is slidably connected in the sleeve 321. The sliding block 324 is located between the first elastic member 323 and the rotating shaft 322. As an intermediate transmission element, one end of the sliding block 324 is fixedly connected to the first elastic member 323, and the other end of the sliding block 324 is rotatably installed with multiple balls 325. The end of the rotating shaft 322 contacts the ball 325 to form a rolling friction pair.

[0040] Specifically, when the rotating shaft 322 rotates, its end contacts the ball bearings 325 on the sliding block 324, forming a rolling friction pair. This makes the rotating shaft 322 more flexible and smooth during rotation, effectively reducing motion resistance. Furthermore, direct friction between the rotating shaft 322 and the first elastic member 323 is avoided, which not only improves the sensitivity of the rotating shaft 322 movement, but also reduces wear between components, thereby increasing the overall stability and service life of the elastic connector 32.

[0041] like Figure 2-Figure 6 As shown, the automatic reversing mechanism 4 includes a lower stop rod 41, a first b-shaped block 42, a second b-shaped block 43, an upper stop rod 44, a spline sleeve 45 and a spline hollow shaft 46. The lower stop rod 41 is fixedly connected to the lower part of the upper steel drill, and the upper stop rod 44 is fixedly connected to the upper part of the upper steel drill. The lower stop rod 41 and the upper stop rod 44 are both located in the groove 11 of the side wall of the upper steel drill, serving as the limit trigger point of the reversing action. The spline sleeve 45 is connected to the end of the sleeve 321 near the wedge block 33 through a rotating pair. The spline sleeve 45 is arranged coaxially with the rotating shaft 322, and a spline hollow shaft 46 is slidably nested inside the spline sleeve 45. The spline sleeve 45 and the spline hollow shaft 46 achieve axial sliding and circumferential limitation through spline cooperation to ensure the accuracy of rotation transmission. The outside of the spline sleeve 45 is connected to the first b block 42 and the second b block 43. The lower block rod 41 and the first b block 42 are located on the same axis, and the upper block rod 44 and the second b block 43 are located on the same axis, forming a reversing trigger alignment relationship.

[0042] Specifically, when the wedge block 33 moves upward with the hammer 2 to the upper portion of the groove 11, the second b-shaped block 43 contacts and is blocked by the upper stop rod 44, forcing the spline sleeve 45 to rotate 90°. The rotation of the spline sleeve 45 drives the rotation shaft 322 through the spline hollow shaft 46, thereby driving the wedge block 33 to rotate, so that the wedge block 33 is located directly above the gap between the two rows of inverted trapezoidal blocks 31, thereby releasing the lock on the hammer 2. When the wedge block 33 moves downward with the hammer 2 to the lower portion of the groove 11, the first b-shaped block 42 contacts and is blocked by the lower stop rod 41, again driving the spline sleeve 45 to rotate 90° in the opposite direction, causing the wedge block 33 to rotate back to its original angle and restore the limit function.

[0043] Example 3: Based on Example 2, Figure 11 As shown, the foundation strength detection device for construction also includes a support mechanism 6, which includes a fixing member 61, a telescopic rod 62, an insert block 63 and a support member 64. The fixing member 61 is hingedly connected to three telescopic rods 62 at evenly spaced intervals in the circumference. The lower ends of the three telescopic rods 62 are hingedly connected to the insert block 63. The support member 64 is located below the telescopic rod 62, and the telescopic rod 62 is detachably connected to the support member 64 through the insert block 63.

[0044] Specifically, when carrying out foundation strength detection, first support member 64 is placed on the ground of the position to be detected to ensure that it is placed stably and accurately positioned. Subsequently, the insert block 63 at the lower end of telescopic rod 62 is fixed on support member 64. Then, steel drill body 1 is vertically inserted into fixing member 61 inside, and steel drill body 1 is kept vertically standing on the ground. Afterwards, fixing member 61 is firmly connected to the outside of the lower steel drill to form an integral support. In this way, there is no need for the detection personnel to manually support steel drill body 1, and the telescopic rod 62 and support member 64 can be relied on to provide stable support for steel drill body 1, effectively preventing steel drill body 1 from tilting or toppling during the detection process. When the core hammer 2 impacts steel drill body 1 and makes it gradually penetrate into the soil layer, the three telescopic rods 62 can automatically and synchronously shrink according to the trend of steel drill body 1 sinking, and continue to provide lateral stable support to steel drill body 1 during the whole penetration process, thereby ensuring the safety of the detection process and the accuracy of data collection.

[0045] like Figure 11-13As shown, the fixing member 61 includes a fixing sleeve 611, a curved plate 613, a shift rod 614, a first rubber plate 616, a second rubber plate 617 and a limit pin 618. The fixing sleeve 611 is provided with a notch 612 extending from the center to the periphery. The curved plate 613 is slidably connected to the inner side of the fixing sleeve 611 and can slide circumferentially along the inner wall of the fixing sleeve 611. An opening 615 is provided in the middle of the fixing sleeve 611. The outer side of the curved plate 613 is connected to the shift rod 614, which passes through the opening 615. The inner side of the curved plate 613 is provided with a first rubber plate 616, and one end of the first rubber plate 616 gradually thickens toward the other end. Second rubber plates 617 are provided on the upper and lower sides of the notch 612 of the fixing sleeve 611. A limit pin 618 is slidably provided at the eccentric part of the fixing sleeve 611, and the lower end of the limit pin 618 is located in the opening 615.

[0046] Specifically, insert the lower steel drill into the notch 612 of the fixing sleeve 611, pull the limit pin 618 upward, and then toggle the lever 614 to drive the arc plate 613 to slide in the fixing sleeve 611, so that the arc plate 613 moves circumferentially. At this time, the thinner end of the first rubber plate 616 first contacts the lower steel drill, and as the arc plate 613 continues to slide, the first rubber plate 616 gradually clings to the surface of the lower steel drill from thin to thick, and cooperates with the second rubber plates 617 provided on the upper and lower sides of the notch 612 to achieve fixation. Part 61 is firmly clamped on the lower steel drill so that the curved plate 613 blocks the notch 612, and then the limit pin 618 is pushed downward to block the lever 614 to prevent the lever 614 from moving. When it is necessary to loosen the fixing part 61, the limit pin 618 is pulled upward so that it does not block the lever 614, and the lever 614 is moved to move the curved plate 613 away from the notch 612 of the fixing sleeve 611. When the curved plate 613 is reset, the fixing sleeve 611 can be removed from the lower steel drill through the notch 612 thereon.

[0047] like Figure 11 、 Figure 14 and Figure 15 As shown, the support member 64 includes two semicircular rings 641 hinged to each other, and the two semicircular rings 641 can be opened and closed relative to each other, which are convenient for storage when not in use. The top of each semicircular ring 641 is provided with a connecting hole 642 that is compatible with the plug block 63, which is used to achieve detachable connection with the plug block 63 at the lower end of the telescopic rod 62. A sliding groove 643 is respectively provided at the opposite ends of the two semicircular rings 641, and an arc-shaped sliding rod 644 is slidably connected in the sliding groove 643. An elastic locking rod 645 is fixedly connected to the middle of the top of the left semicircular ring 641, and an avoidance opening is left in the middle of the elastic locking rod 645, and a protrusion extending to the left and right sides is provided on the top. The top of the protrusion is an inclined surface, and the elastic locking rod 645 is compatible with the connecting hole 642 in the middle of the right semicircular ring 641.

[0048] Specifically, during the closing process, the operator applies force through the handle 646 to bring the two semicircular rings 641 closer together. At this time, the inclined surface of the protrusion on the top of the elastic locking rod 645 contacts the end of the right connecting hole 642 and produces a squeezing effect, causing the elastic locking rod 645 to elastically deform and shrink on both sides toward the avoidance opening. When the locking rod fully enters the connecting hole 642, the elastic locking rod 645 returns to its original state, thereby achieving rapid and stable locking and ensuring the stability of the closed state. When it is necessary to unfold the support member 64, it is only necessary to manually press the protrusions on the left and right sides of the upper end of the elastic locking rod 645 to cause it to deform again toward the avoidance opening until the distance between the protrusions is less than the diameter of the connecting hole 642, and the two semicircular rings 641 can be easily opened. The handle 646 provides a good grip point for the operator when carrying, adjusting the position, or performing opening and closing operations, thereby improving ease of use and operating efficiency.

[0049] like Figure 14 As shown, it also includes a rubber block 648, and each semicircular ring 641 is provided with a plurality of ground nail holes 647, which facilitate the support member 64 to be firmly fixed to the ground through the ground nails, preventing the support structure from being displaced due to external force during the detection process, thereby improving the stability of the entire detection device and data accuracy.

[0050] like Figure 14 As shown, rubber blocks 648 are also included. Rubber blocks 648 are evenly spaced at the top of the left semicircular ring 641. When the two semicircular rings 641 are closed, the rubber blocks 648 are located between the left and right semicircular rings 641, playing a role of buffering and isolation, effectively avoiding rigid collision between the two during the closing process, and reducing structural wear and impact noise.

[0051] Example 4: Based on Example 3, Figure 4 、 Figure 5 、 Figure 6As shown in Figure 8, the foundation strength detection device for construction also includes an anti-rotation mechanism 5, which includes a connecting ring 51, a guide plate 52, a guide sleeve 53, a second elastic member 54, a locking block 55, a contact rod 56, a limiting protrusion 57, a lower unlocking rod 58 and an upper unlocking rod 59. The left end of the sleeve 321 is connected to the connecting ring 51, the front end of the connecting ring 51 is connected to the guide plate 52, and the guide plate 52 is slidably connected to the guide sleeve 53. Two second elastic members 54 are connected between the guide sleeve 53 and the guide plate 52. In this embodiment, the second elastic member 54 is also a coil spring. , a locking block 55 is connected to the guide sleeve 53, and a contact rod 56 is connected to the locking block 55 for triggering the unlocking action. Four limiting protrusions 57 are provided at circumferential intervals on the outer side of the right end of the spline sleeve 45. The limiting protrusions 57 are used to cooperate with the locking block 55 to limit the rotation of the spline sleeve 45 to prevent it from accidentally rotating in the non-operating state. A lower unlocking rod 58 is connected to the lower block rod 41, and an upper unlocking rod 59 is connected to the upper block rod 44. The upper end of the lower unlocking rod 58 is higher than the lower block rod 41, and the lower end of the upper unlocking rod 59 is lower than the upper block rod 44. The upper end of the lower unlocking rod 58 and the lower end of the upper unlocking rod 59 are both inclined surfaces.

[0052] Specifically, under normal conditions, the guide sleeve 53 remains extended rearward under the action of the second elastic member 54, and the locking block 55 abuts against the outer wall of the spline sleeve 45 and is located between two adjacent limiting protrusions 57, thereby restricting the rotation of the spline sleeve 45 and achieving an anti-rotation function. When the hammer 2 rises to the upper limit position, the inclined surface of the upper unlocking rod 59 first contacts the contact rod 56, and through this inclined surface, pushes the contact rod 56, driving the locking block 55 forward and releasing it from the locked position between the two limiting protrusions 57. At this time, the second elastic member 54 is compressed, releasing the rotation restriction on the spline sleeve 45. Subsequently, the second b-block 43 contacts the upper stop rod 44, causing the spline sleeve 45 to rotate, thereby driving the wedge block 33 to complete the reversing action. Similarly, when the core hammer 2 drops to the lower limit position, the inclined surface of the lower unlocking rod 58 contacts and pushes the contact rod 56, causing the locking block 55 to move forward and disengage from the limiting protrusion 57, and similarly compressing the second elastic member 54 to release the lock of the spline sleeve 45; then the first b block 42 contacts the lower stop rod 41, driving the spline sleeve 45 in reverse to reset and rotate, thereby realizing the reset and reversal of the wedge block 33.

[0053] It should be understood that the above description is only for illustrative purposes and is not intended to limit the present invention. Those skilled in the art will appreciate that variations of the present invention will fall within the scope of the claims herein.

Claims

1. A foundation strength detection device for construction, comprising a steel drill body (1), a core hammer (2) and a handle (21), wherein the core hammer (2) is slidably arranged on the steel drill body (1), and the handle (21) is provided on the outer side of the core hammer (2), characterized in that: The invention also includes a limiting device (3) and an automatic reversing mechanism (4), wherein a groove (11) extending along the length direction is provided on the side of the steel drill body (1), and a rectangular groove (22) is provided at an eccentric position of the core hammer (2), and the rectangular groove (22) is communicated with the center hole of the core hammer (2); the limiting device (3) is arranged between the steel drill body (1) and the core hammer (2), and comprises an inverted trapezoidal block (31), an elastic connecting member (32) and a wedge block (33), and a row of inverted trapezoidal blocks (31) are respectively provided on both sides of the length direction of the groove (11), and a gap is left between two adjacent inverted trapezoidal blocks (31) in the same row, and the two rows of inverted trapezoidal blocks (31) are connected to each other. ) a gap is left between the two rows of inverted trapezoidal blocks (31) for the wedge block (33) to pass through; the upper part of the rectangular groove (22) of the core hammer (2) is connected to the wedge block (33) through an elastic connecting piece (32); the automatic reversing mechanism (4) is arranged between the steel drill body (1) and the limit device (3), and is used to drive the wedge block (33) to rotate 90 degrees when the wedge block (33) rises to the upper end position of the groove (11) with the core hammer (2), so that it is located just above the gap between the two rows of inverted trapezoidal blocks (31), and to drive the wedge block (33) to rotate 90 degrees in the opposite direction to reset when the wedge block (33) falls to the lower end position of the groove (11) with the core hammer (2).

2. The foundation strength detection device for construction according to claim 1, characterized in that: The elastic connecting member (32) includes a sleeve (321), a rotating shaft (322) and a first elastic member (323). The sleeve (321) is connected to the inner wall of the core hammer (2). One end of the rotating shaft (322) is connected to the wedge block (33), and the other end is inserted into the sleeve (321) and realizes rotation and sliding cooperation with the sleeve (321). The first elastic member (323) is provided inside the sleeve (321). The rotating shaft (322) is elastically connected to the core hammer (2) through the first elastic member (323).

3. The foundation strength detection device for construction according to claim 2, characterized in that: The automatic reversing mechanism (4) comprises a lower stop rod (41), a first b-shaped block (42), a second b-shaped block (43), an upper stop rod (44), a spline sleeve (45) and a spline hollow shaft (46). The upper stop rod (44) and the lower stop rod (41) are respectively connected to the upper and lower sides of the steel drill body (1). The spline sleeve (45) is connected to the sleeve (321) through a rotating pair. The spline hollow shaft (46) is slidably nested inside the spline sleeve (45). The spline sleeve (45) and the spline hollow shaft (46) achieve axial sliding and circumferential limiting through spline matching. The outer side of the spline sleeve (45) is connected to the first b-shaped block (42) and the second b-shaped block (43). The lower stop rod (41) and the first b-shaped block (42) are located on the same axis, and the upper stop rod (44) and the second b-shaped block (43) are located on the same axis.

4. The foundation strength detection device for construction according to claim 2, characterized in that: The elastic connecting member (32) further includes a sliding block (324) and a ball (325). The sliding block (324) is slidably connected to the sleeve (321). One end of the sliding block (324) is connected to the first elastic member (323), and the other end is rotatably mounted with the ball (325). The end of the rotating shaft (322) contacts the ball (325).

5. The foundation strength detection device for construction according to claim 3, characterized in that: The invention also includes a support mechanism (6), the support mechanism (6) including a fixing member (61), a telescopic rod (62), an insert block (63) and a support member (64), the fixing member (61) is circumferentially connected to a plurality of telescopic rods (62), the lower end of the telescopic rod (62) is provided with an insert block (63), and the telescopic rod (62) is detachably connected to the support member (64) via the insert block (63).

6. The foundation strength detection device for construction according to claim 5, characterized in that: The fixing member (61) includes a fixing sleeve (611), an arc-shaped plate (613), a shifting rod (614), a first rubber plate (616), and a second rubber plate (617). The fixing sleeve (611) is provided with a notch (612). The inner side of the fixing sleeve (611) is slidably connected to the arc-shaped plate (613). The shifting rod (614) is connected to the arc-shaped plate (613). The inner side of the arc-shaped plate (613) is provided with a first rubber plate (616) that gradually thickens from one end toward the other end. The second rubber plate (617) is provided in the notch (612) of the fixing sleeve (611).

7. The foundation strength detection device for construction according to claim 6, characterized in that: The support member (64) includes two semicircular rings (641) hinged to each other, and a connecting hole (642) adapted to the plug block (63) is provided at the top of the semicircular ring (641), and a sliding groove (643) is respectively provided at the opposite ends of the two semicircular rings (641), and an arc-shaped sliding rod (644) is slidably connected in the sliding groove (643). An elastic locking rod (645) is connected to the top of one semicircular ring (641), and the elastic locking rod (645) is adapted to the connecting hole (642) of the other semicircular ring (641).

8. The foundation strength detection device for construction according to claim 7, characterized in that: A ground nail hole (647) is provided on the semicircular ring (641).

9. The foundation strength detection device for construction according to claim 8, characterized in that: It also includes a rubber block (648), wherein the rubber block (648) is provided on the top of the semicircular ring (641) on one side.

10. The foundation strength detection device for construction according to claim 3, characterized in that: The anti-rotation mechanism (5) further comprises a connecting ring (51), a guide plate (52), a guide sleeve (53), a second elastic member (54), a locking block (55), a contact rod (56), a limiting protrusion (57), a lower unlocking rod (58) and an upper unlocking rod (59), the sleeve (321) is connected to the guide plate (52) via the connecting ring (51), the guide plate (52) is slidably connected to the guide sleeve (53), and a second elastic member (54) is connected between the guide sleeve (53) and the guide plate (52). Two elastic members (54), a locking block (55) is connected to the guide sleeve (53), and a contact rod (56) is connected to the locking block (55) for triggering the unlocking action. Limiting protrusions (57) are provided at intervals in the circumferential direction on the outer side of the spline sleeve (45). The limiting protrusions (57) are used to cooperate with the locking block (55) to limit the rotation of the spline sleeve (45) to prevent it from accidentally rotating in a non-operating state. A lower unlocking rod (58) is connected to the lower stop rod (41), and an upper unlocking rod (59) is connected to the upper stop rod (44).

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