Rotary jet grouting anchor cable construction structure for soft soil foundation pit

Abstract

The utility model provides a soft soil foundation pit rotary jet grouting anchor cable construction structure which comprises a pre-formed hole, the pre-formed hole is formed in an anchor cable positioning point of a soft soil foundation pit, an outer end fixing disc is fixed to the inlet end of the pre-formed hole, a drill rod is inserted into the pre-formed hole, a locking assembly is arranged on the surface of a drill bit at the front end of the drill rod, and an outer end fixing disc is fixed to the outer end fixing disc. The locking assembly comprises an anchor disc, the front end of the steel strand is fixed in the anchor disc, the rear end of the steel strand is guided and limited by a clamping frame at the outer end, after the steel strand encounters a hard protrusion in a preformed hole, the steel strand is extruded so that the clamping frame at the front end can slide in a moving groove, a vertical plate at the rear end can slide, and the penetrating position of the steel strand is adjusted; according to the steel strand threading device, direct collision with the hard protrusion position is avoided, the smooth process of the threading process is guaranteed, after the steel strand reaches the preset position, the rotating rod drives the rotating ring to rotate, the two cams of the rotating ring make extrusion contact with the outer plate, the position of the front end clamping frame and the position of the steel strand are kept, and therefore the steel strand threading convenience is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary grouting anchor cables, in particular to a rotary grouting anchor cable construction structure for a soft soil foundation pit. Background Art

[0002] High-pressure rotary jet anchor cable is a prestressed anchor cable developed for foundation pit support in soft soil. During construction, hole-making, grouting, mixing, and reinforcement insertion are completed at one time. It has the advantages of large anchor diameter, high pull-out resistance provided by a single anchor cable, and fast construction speed. Because hole-making, grouting, mixing, and reinforcement insertion are completed at one time, the jacking pressure required during drilling is relatively large, and the anchor cable can be smoothly pushed through soft soil. However, when the anchor cable passes through hard strata such as hard interlayers, dense sand layers, hard plastic clay, and weathered rock layers in the strata, it will be difficult to push, resulting in the anchor cable length not reaching the designed length. At the same time, since hole-making and reinforcement insertion are carried out at the same time, it is easy for the steel strands that follow up at the same time to be entangled on the drill rod when the drill rod rotates, causing difficulties in drilling, the drill rod cannot be pulled out when the hole is made to the designed position, or the steel strands are spiral in the anchor cable after the drill rod is pulled out, shortening the effective length of the anchor cable. In order to prevent the steel strands from being entangled in the drill rod, the current construction mostly adopts the method of alternating forward and reverse rotation, that is, drilling is first carried out by rotating forward 180-360° and then reversed 180-360°. This not only affects the drilling speed, but also cannot completely avoid the problem of steel strands being entangled in the drill rod.

[0003] Patent CN116716872A proposes a high-pressure rotary grouting anchor cable drill tool and construction method for preventing steel strand entanglement. By arranging a flexibly rotatable pressure bearing on the rotary grouting drill bit and a resistance-increasing plate on the foundation pit support structure to tighten the steel strand, it is ensured that the steel strand does not rotate when the rotary grouting drill rod rotates, and the steel strand is effectively prevented from being entangled on the rotary grouting drill rod during rotary grouting construction. The three-wing drill bit is used to pre-form holes, which solves the problem that the rotary grouting anchor cable is difficult to pass through dense hard formations, and effectively guarantees the length of the high-pressure rotary grouting anchor cable. It can not only avoid the problem of steel strand entanglement in the drill rod when drilling holes and inserting reinforcement, but also enable the rotary grouting anchor cable to pass through hard interlayers or hard formations smoothly, thereby ensuring the effective design length of the rotary grouting anchor cable.

[0004] In the above scheme, since the front end of the steel strand is locked and the rear end is limited by the resistance increasing plate, the insertion direction of the steel strand is fixed. Therefore, during the insertion process, if it encounters a protrusion or hard soil layer in the pre-formed hole and contacts with the steel strand, the movement of the drill rod will be hindered, affecting the progress of the rotary grouting anchor cable construction. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model aims to provide a soft soil foundation pit rotary grouting anchor cable construction structure to solve the problems raised in the above-mentioned background technology. The utility model has a novel structure. The front end of the steel strand is fixed inside the anchor plate, and the rear end is guided and limited by the outer end clamping frame. After encountering the hard protrusion in the pre-formed hole, the steel strand is squeezed so that the front end clamping frame slides along the movable groove, and the vertical plate at the rear end slides to adjust the insertion position of the steel strand to avoid direct collision with the hard protrusion position, thereby ensuring the smoothness of the insertion process. After reaching the predetermined position, the swivel is driven to rotate by the swivel rod. After the two cams of the swivel are squeezed and contacted with the outer plate, the position of the front end clamping frame and the position of the steel strand are maintained, thereby realizing the convenience of threading the steel strand.

[0006] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a soft soil foundation pit rotary grouting anchor cable construction structure, including a pre-formed hole, the pre-formed hole is opened on the anchor cable positioning point of the soft soil foundation pit, the entrance end of the pre-formed hole is fixed with an outer end fixing disk, and a drill rod is inserted in the pre-formed hole, a locking assembly is provided on the front end drill bit surface of the drill rod, the locking assembly includes an anchor plate, the anchor plate is rotatably mounted on the drill bit tail end through a bearing, and two groups of front end clamping frames are symmetrically provided on the surface of the anchor plate, a steel strand is clamped in the front end clamping frame, an outer end clamping frame is provided on the surface of the outer end fixing plate corresponding to the steel strand insertion position, and the outer end clamping frame is slidably wrapped on the rear end surface of the steel strand, the front end clamping frame and the outer end clamping frame are both composed of two groups of clamping frames, a threaded layer is fixed on the outer side surface of the front end clamping frame, and the outer end of the threaded layer is meshingly sleeved with a sealing cover, and the sealing cover is wrapped around the front end of the steel strand.

[0007] Furthermore, the locking assembly also includes a movable groove, a movable groove is arranged at the position of the anchor plate corresponding to the front end clamp frame, and sliding grooves are arranged on both sides of the movable groove, and a slider is slidably connected inside the sliding groove, the slider of the sliding groove is fixedly connected to the outer front end clamp frame through a telescopic rod, a spring is fixed at the bottom of the slider of the sliding groove, and the other end of the spring is fixed to the inner wall of the sliding groove.

[0008] Furthermore, a connecting frame is provided on both sides of the drill pipe at the front end of the anchor plate, and the upper and lower ends of the connecting frame are located on both sides of the front clamping frame. An adjusting bolt is engaged and inserted on the surface of the anchor plate, and the other end of the adjusting bolt is rotatably connected to the connecting frame through a bearing.

[0009] Furthermore, plug plates are fixed on both sides of the front clamp frame, and slots are provided at the positions corresponding to the plug plates on the vertical surfaces of the upper and lower ends of the connecting frame, and the plug plates slide along the inside of the slots of the connecting frame.

[0010] Furthermore, a vertical plate is slidably inserted into the moving path of the outer end fixing plate corresponding to the outer end clamping frame, and the bottom of the vertical plate is connected to the two sides of the outer end clamping frame by bolts. A locking bolt is meshed and inserted into the surface of the vertical plate, and the locking bolt can be squeezed into contact with the surface of the outer end fixing plate.

[0011] Furthermore, a swivel is rotatably mounted on the rear end surface of the anchor plate via a bearing, a swivel rod is inserted on the surface of the swivel via threaded engagement, and the other end of the swivel rod passes through a pre-formed hole.

[0012] Furthermore, two cams are symmetrically arranged on the surface of the rotating ring, an outer plate is arranged at the rear end of the front clamp frame, and the cams can be in compression contact with the outer plate.

[0013] Furthermore, the rotating rod is located on the outer end surface of the outer end fixing plate and is slidably sleeved with an arc frame, and the other end of the rotating rod is inserted into the top of the arc frame.

[0014] Beneficial effects of the utility model: the utility model is a soft soil foundation pit rotary grouting anchor cable construction structure, comprising a pre-formed hole; an outer end fixing plate; a vertical plate; a locking bolt; an outer end clamping frame; a drill rod; a locking assembly; an anchor plate; a moving groove; a front end clamping frame; a connecting frame; an adjusting bolt; a slide groove; a spring; a threaded layer; a sealing cover; a plug plate; a steel strand; an arc frame; a rotating rod; a rotating ring; a cam; an outer plate;

[0015] 1. The utility model buckles the arc frame on the outer end of the drill rod to keep it parallel to the drill rod. After the steel strand and the drill bit reach the specified position, the rotating rod rotates around the drill rod to drive the rotating ring to rotate, so that the two cams are squeezed and contacted with the outer plate to prevent the front clamping frame from lifting and moving, maintain the position of the steel strand, and then rotate the rotating rod alone to separate the meshing connection between it and the rotating ring.

[0016] 2. The utility model can slide the vertical plate upward without affecting the entry of the drill rod and the anchor plate into the pre-formed hole, and then the rear end of the steel strand is limited and guided by the outer end clamping frame at the bottom of the vertical plate.

[0017] 3. The utility model seals the front end of the steel strand by means of a sealing cover. Due to the plugging of the plug plate and the connecting frame, after the steel strand encounters a hard protrusion, the front end clamping frame can slide along the moving groove, providing a certain displacement to avoid the protrusion.

[0018] 4. Compared with the prior art, the utility model has the front end of the steel strand fixed inside the anchor plate, and the rear end guided and limited by the outer end clamping frame. After encountering the hard protrusion in the pre-formed hole, the steel strand is squeezed so that the front end clamping frame slides along the movable groove, and the vertical plate at the rear end slides to adjust the insertion position of the steel strand to avoid direct collision with the hard protrusion position, thereby ensuring the smoothness of the insertion process. After reaching the predetermined position, the swivel is driven to rotate by the swivel rod. After the two cams of the swivel are squeezed and contacted with the outer plate, the position of the front end clamping frame and the position of the steel strand are maintained, thereby realizing the convenience of threading the steel strand. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a soft soil foundation pit rotary grouting anchor cable construction structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the surface structure of the outer end fixing plate of a soft soil foundation pit rotary grouting anchor cable construction structure of the utility model;

[0021] Figure 3 This is one of the schematic diagrams of the locking assembly structure of the soft soil foundation pit rotary grouting anchor cable construction structure of the utility model;

[0022] Figure 4 This is a second schematic diagram of the locking component structure of a soft soil foundation pit rotary grouting anchor cable construction structure of the utility model;

[0023] Figure 5 The utility model is a schematic diagram of the front end structure of a rotating rod of a rotary grouting anchor cable construction structure for a soft soil foundation pit.

[0024] In the figure: 1. pre-formed hole; 2. outer end fixing plate; 21. vertical plate; 22. locking bolt; 23. outer end clamping frame; 3. drill rod; 4. locking assembly; 41. anchor plate; 42. movable groove; 43. front end clamping frame; 44. connecting frame; 45. adjusting bolt; 46. slide groove; 47. spring; 48. threaded layer; 49. cover; 410. plug plate; 5. steel strand; 6. arc frame; 61. rotating rod; 62. swivel; 63. cam; 64. outer plate. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] See also Figures 1 to 5The utility model provides a technical solution: a soft soil foundation pit rotary grouting anchor cable construction structure, comprising a preformed hole 1, the preformed hole 1 is opened on the anchor cable positioning point of the soft soil foundation pit, an outer end fixing plate 2 is fixed to the entrance end of the preformed hole 1, and a drill rod 3 is inserted into the preformed hole 1, a locking assembly 4 is provided on the front end drill bit surface of the drill rod 3, the locking assembly 4 comprises an anchor plate 41, the anchor plate 41 is rotatably mounted on the rear end of the drill bit through a bearing, and two groups of front end clamping frames 43 are symmetrically provided on the surface of the anchor plate 41, a steel strand 5 is clamped in the front end clamping frame 43, and an outer end clamping frame 23 is provided on the surface of the outer end fixing plate 2 corresponding to the insertion position of the steel strand 5, The outer end clamping frame 23 is slidably wrapped around the rear end surface of the steel strand 5, and the front end clamping frame 43 and the outer end clamping frame 23 are both composed of two groups of clamping frames. A threaded layer 48 is fixed on the outer surface of the front end clamping frame 43, and the outer end of the threaded layer 48 is engaged with a cover 49, and the cover 49 is wrapped around the front end of the steel strand 5. When using the device, the outer end fixing disk 2 is fixed to the entrance end of the pre-formed hole 1, and then the front end of the steel strand 5 is installed inside the locking assembly 4, and the drill rod 3 is passed into the pre-formed hole 1. The rear end of the steel strand 5 is guided and limited by the two outer end clamping frames 23 on the outer end fixing disk 2 to avoid entanglement with the drill rod 3 during the insertion process.

[0027] In this embodiment, the locking assembly 4 also includes a moving groove 42, the anchor plate 41 is provided with a moving groove 42 at a position corresponding to the front end clamping frame 43, and sliding grooves 46 are provided on both sides of the moving groove 42, and a slider is slidably connected inside the sliding groove 46, the slider of the sliding groove 46 is fixedly connected to the front end clamping frame 43 on the outside through a telescopic rod, a spring 47 is fixed to the bottom of the slider of the sliding groove 46, and the other end of the spring 47 is fixed to the inner wall of the sliding groove 46, the front end of the anchor plate 41 is provided with a connecting frame 44 on both sides of the drill rod 3, and the upper and lower ends of the connecting frame 44 are located on both sides of the front end clamping frame 43, an adjusting bolt 45 is meshed and inserted on the surface of the anchor plate 41, and the other end of the adjusting bolt 45 is rotatably connected to the connecting frame 44 through a bearing, and plug plates 410 are fixed on both sides of the front end clamping frame 43, and slots are provided on the vertical surfaces of the upper and lower ends of the connecting frame 44 corresponding to the position of the plug plate 410, and the plug plate 410 is rotated along the connecting frame 4 4, the front end of the steel strand 5 is wrapped in the front end clamping frame 43, and the two groups of connecting frames 44 are driven to move closer by rotating the adjusting bolt 45, so that the front end clamping frame 43 clamps the front end of the steel strand 5, and the threaded layer 48 on the outside of the front end clamping frame 43 is merged into a whole, and the front end of the steel strand 5 is sealed by the cover 49. Due to the connection between the plug plate 410 and the connecting frame 44, the steel strand 5 can slide along the moving groove 42 after encountering a hard protrusion, providing a certain displacement to avoid the protrusion, and reset by the spring 47 (in the scheme, the size of the steel strand 5 clamped in the front end clamping frame 43 is smaller than the size of the rear end after trimming, so that the size of the steel strand 5 at the rear end of the anchor plate 41 exceeds the anchor plate 41, the slider in the slide groove 46 in the scheme, the telescopic rod connecting the slider and the front end clamping frame 43, and the plugging of the plug plate 410 and the connecting frame 44 are all common existing technologies and are not described in detail here).

[0028] In this embodiment, a vertical plate 21 is slidably inserted on the moving path of the outer end fixing plate 2 corresponding to the outer end clamping frame 23, and the bottom of the vertical plate 21 is connected to the two sides of the outer end clamping frame 23 by bolts, and a locking bolt 22 is meshed and inserted on the surface of the vertical plate 21, and the locking bolt 22 can be squeezed and contacted with the surface of the outer end fixing plate 2. The upward sliding of the vertical plate 21 will not affect the entry of the drill rod 3 and the anchor plate 41 into the pre-formed hole 1, and then the rear end of the steel strand 5 is limited and guided by the outer end clamping frame 23 at the bottom of the vertical plate 21.

[0029] In this embodiment, a swivel 62 is rotatably mounted on the rear end surface of the anchor plate 41 through a bearing, a swivel rod 61 is inserted on the surface of the swivel 62 through a threaded engagement, and the other end of the swivel rod 61 passes through the pre-formed hole 1, two cams 63 are symmetrically arranged on the surface of the swivel 62, an outer plate 64 is arranged at the tail end of the front end clamping frame 43, and the cam 63 can be squeezed and contacted with the outer plate 64, the swivel rod 61 is located on the outer end surface of the outer end fixing plate 2 and is slidably sleeved with an arc frame 6, and the other end of the swivel rod 61 is inserted at the top of the arc frame 6, the length of the swivel rod 61 can be determined according to the length of the drill rod 3, and the arc frame 6 is buckled on the outer end of the drill rod 3 to keep it parallel to the drill rod 3, after the steel strand 5 and the drill bit reach the specified position, the swivel rod 61 is rotated around the drill rod 3 to drive the swivel 62 to rotate, so that the two cams 63 are squeezed and contacted with the outer plate 64, so as to prevent the front end clamping frame 43 from rising and falling and maintain the position of the steel strand 5, and then the swivel rod 61 is rotated alone to separate it from the meshing connection with the swivel 62.

[0030] When using the device, fix the outer end fixing plate 2 at the entrance end of the pre-formed hole 1, wrap the front end of the steel strand 5 inside the front end clamping frame 43, and drive the two sets of connecting frames 44 to move closer by rotating the adjusting bolt 45, so that the front end clamping frame 43 clamps the front end of the steel strand 5, and the threaded layer 48 on the outside of the front end clamping frame 43 is combined into a whole, and the front end is sealed by the sealing cover 49, and the drill rod 3 is inserted into the pre-formed hole 1. Due to the plugging of the plug plate 410 and the connecting frame 44, the steel strand 5 can slide along the moving groove 42 after encountering a hard protrusion, thereby improving the stability of the steel strand 5. A certain displacement is provided to avoid the protrusion, and the rear end of the steel strand 5 is guided and limited by the two outer end clamping frames 23 on the outer end fixing plate 2 to avoid entanglement with the drill rod 3 during the insertion process. The arc frame 6 is buckled on the outer end of the drill rod 3 to maintain parallelism with the drill rod 3. After the steel strand 5 and the drill bit reach the specified position, the rotating rod 61 is rotated around the drill rod 3 to drive the rotating ring 62 to rotate, and the two cams 63 are squeezed and contacted with the outer plate 64 to prevent the front end clamping frame 43 from rising and falling and moving, thereby maintaining the position of the steel strand 5, and then the rotating rod 61 is rotated alone to separate the meshing connection between it and the rotating ring 62.

[0031] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A soft soil foundation pit rotary grouting anchor cable construction structure, comprising a preformed hole (1), characterized in that: The preformed hole (1) is formed at an anchor cable positioning point of a soft soil foundation pit. An outer end fixing plate (2) is fixed at the entrance end of the preformed hole (1), and a drill rod (3) is inserted into the preformed hole (1). A locking assembly (4) is provided on the surface of a drill head at the front end of the drill rod (3). The locking assembly (4) comprises an anchor plate (41). The anchor plate (41) is rotatably mounted at the rear end of the drill head through a bearing, and two groups of front end clamping frames (43) are symmetrically provided on the surface of the anchor plate (41). A steel clamp is clamped in the front end clamping frame (43). Stranded wire (5), an outer end clamping frame (23) is arranged on the surface of the outer end fixing disk (2) corresponding to the insertion position of the steel stranded wire (5), and the outer end clamping frame (23) is slidably wrapped on the rear end surface of the steel stranded wire (5), the front end clamping frame (43) and the outer end clamping frame (23) are both composed of two groups of clamping frames, a threaded layer (48) is fixed on the outer surface of the front end clamping frame (43), and the outer end of the threaded layer (48) is meshedly sleeved with a sealing cover (49), and the sealing cover (49) is wrapped on the front end of the steel stranded wire (5).

2. A soft soil foundation pit rotary grouting anchor cable construction structure according to claim 1, characterized in that: The locking assembly (4) also includes a movable groove (42), the movable groove (42) is arranged at a position of the anchor plate (41) corresponding to the front clamping frame (43), and sliding grooves (46) are arranged on both sides of the movable groove (42), and a slider is slidably connected inside the sliding groove (46), the slider of the sliding groove (46) is fixedly connected to the outer front clamping frame (43) through a telescopic rod, and a spring (47) is fixed at the bottom of the slider of the sliding groove (46), and the other end of the spring (47) is fixed to the inner wall of the sliding groove (46).

3. A soft soil foundation pit rotary grouting anchor cable construction structure according to claim 2, characterized in that: The front end of the anchor plate (41) is located on both sides of the drill rod (3) and a connecting frame (44) is provided, and the upper and lower ends of the connecting frame (44) are located on both sides of the front clamping frame (43). An adjusting bolt (45) is meshed and inserted on the surface of the anchor plate (41), and the other end of the adjusting bolt (45) is rotatably connected to the connecting frame (44) through a bearing.

4. A soft soil foundation pit rotary grouting anchor cable construction structure according to claim 3, characterized in that: Insertion plates (410) are fixed on both sides of the front clamp frame (43), and slots are provided at the positions corresponding to the insertion plates (410) on the vertical surfaces of the upper and lower ends of the connecting frame (44), and the insertion plates (410) slide along the inside of the slots of the connecting frame (44).

5. The soft soil foundation pit rotary grouting anchor cable construction structure according to claim 1, characterized in that: A vertical plate (21) is slidably inserted into the moving path of the outer end fixing plate (2) corresponding to the outer end clamping frame (23), and the bottom of the vertical plate (21) is connected to the two sides of the outer end clamping frame (23) through bolts. A locking bolt (22) is meshed and inserted into the surface of the vertical plate (21), and the locking bolt (22) can be pressed and contacted with the surface of the outer end fixing plate (2).

6. The soft soil foundation pit rotary grouting anchor cable construction structure according to claim 4, characterized in that: A swivel (62) is rotatably mounted on the rear end surface of the anchor plate (41) via a bearing, a swivel rod (61) is inserted into the surface of the swivel (62) via a threaded engagement, and the other end of the swivel rod (61) passes through the pre-formed hole (1).

7. A soft soil foundation pit rotary grouting anchor cable construction structure according to claim 6, characterized in that: Two cams (63) are symmetrically arranged on the surface of the rotating ring (62), an outer plate (64) is arranged at the rear end of the front clamp frame (43), and the cams (63) can be in compression contact with the outer plate (64).

8. The soft soil foundation pit rotary grouting anchor cable construction structure according to claim 7, characterized in that: The rotating rod (61) is located on the outer end surface of the outer end fixing plate (2) and is slidably sleeved with an arc frame (6), and the other end of the rotating rod (61) is inserted into the top of the arc frame (6).

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