Double-layer expanding drill bit for civil engineering pile foundation construction

Abstract

The utility model relates to the technical field of civil engineering, and discloses a double-layer expanding drill bit for civil engineering pile foundation construction, which comprises a conical end head and a connecting shaft rod, the conical end head and the connecting shaft rod are fixedly mounted, a guide groove is annularly formed in the conical end head, an adjustable drilling tool is movably connected in the guide groove, and the adjustable drilling tool is arranged in the connecting shaft rod. An inner limiting piece and an outer limiting piece are arranged on the inner side and the outer side of the connecting shaft rod respectively, the adjustable drilling tool comprises a drilling tool rod, a first contact piece and a second contact piece, the inner limiting piece comprises a limiting rod, the upper end of the limiting rod is rotationally connected with an adjusting screw rod, the outer limiting piece comprises a limiting sleeve, and the limiting sleeve is in threaded connection with the connecting shaft rod. According to the scheme, rapid adjustment of the structure can be achieved, and the expanding machining requirement is met; and the number of parts adopted by the inner limiting piece and the outer limiting piece is small, the machining difficulty is low, the use cost of the expanding drill bit is further reduced, and the stability and safety in the machining process are effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering, and particularly relates to a double-layer diameter-expanding drill bit for civil engineering pile foundation construction. Background Technique

[0002] A pile foundation is composed of piles and pile caps. In the field of civil engineering, it is commonly used in the construction of precast piles or cast-in-place piles. For either type of foundation construction, it is necessary to pre-drill holes in the construction land. The existing method is to use a drill bit for drilling, and the diameter of the drill bit is adjusted according to the diameter of the drilled hole.

[0003] In the publication number: CN217080331U, a double-layer diameter-expanding drill bit for civil engineering pile foundation construction, by horizontally pushing the L-shaped rod, the drill blade moves horizontally along the inner part of the blade groove. The L-shaped rod slides horizontally along the inner groove of the limit block. The bolt A passes through the positioning holes at different positions on the L-shaped rod, and the corresponding nuts are tightened at the end of the bolt A for fixation, and then the position of the drill blade is adjusted to complete the adjustment of the drilling diameter of the drill bit. However, this method is relatively cumbersome in operation, and there are too many components, increasing the use cost of diameter expansion. In view of this, we propose a double-layer diameter-expanding drill bit for civil engineering pile foundation construction. Content of the Utility Model

[0004] The purpose of the utility model is to provide a double-layer diameter-expanding drill bit for civil engineering pile foundation construction, so as to solve the problems in the existing patents in the above background technology that the adjustment operation of the diameter-expanding drill bit is relatively cumbersome, there are too many components, and the use cost of diameter expansion is increased.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A double-layer diameter-expanding drill bit for civil engineering pile foundation construction, including a conical end and a connecting shaft rod, the conical end and the connecting shaft rod are fixedly installed, a guiding groove is annularly opened on the conical end, an adjustable drill blade is movably connected inside the guiding groove, and an inner limiting member and an outer limiting member are respectively arranged on the inner and outer sides of the connecting shaft rod;

[0006] The adjustable drill blade includes a drill blade rod, a first contact member and a second contact member. The drill blade rod is annularly inserted on the conical end. The first contact member and the second contact member are fixedly installed above the drill blade rod, and the second contact member is arranged outside the first contact member. A cutting piece is arranged on the outer side surface of the drill blade rod. The second contact member is movably connected inside the guiding groove;

[0007] The inner limiting member includes a limiting rod, the upper end of the limiting rod is rotatably connected with an adjusting screw rod, the adjusting screw rod is threadedly connected with the connecting shaft rod, a first inclined surface is arranged on the lower end surface of the limiting rod, and the first inclined surface contacts with the first contact member;

[0008] The outer limiting member includes a limiting sleeve, the limiting sleeve is threadedly connected to the connecting shaft rod, a second inclined surface is provided at the lower end inside the limiting sleeve, and the second inclined surface contacts the second contact member.

[0009] Preferably, the connecting shaft rod, the limiting rod and the limiting sleeve are collinear, and the length of the limiting rod is less than the length of the connecting shaft rod.

[0010] Preferably, the first inclined surface and the second inclined surface form an angle less than [angle value].

[0011] Preferably, the guiding groove is a through groove, and the length of the guiding groove is greater than the length of the second contact member.

[0012] Preferably, a groove is formed at the upper end of the connecting shaft rod, the adjusting screw rod is arranged inside the groove, and the adjusting screw rod and the groove are collinear.

[0013] Preferably, the height of the drill rod is less than the height of the conical end, and the lower end surfaces of the drill rod and the conical end are flush.

[0014] Preferably, the outer diameter of the limiting rod is less than the inner diameter of the connecting shaft rod.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. For the double-layer expanding drill bit for civil engineering pile foundation construction, by respectively arranging an inner limiting member and an outer limiting member on the inner and outer sides of the connecting shaft rod, the distance that the adjustable drill bit protrudes from the conical end can be quickly adjusted according to needs to achieve the requirement of expanding diameter processing; and the number of parts used for the inner limiting member and the outer limiting member is small, and the processing difficulty is low, further reducing the use cost of the expanding drill bit;

[0017] 2. For the double-layer expanding drill bit for civil engineering pile foundation construction, the adjustment of the adjustable drill bit requires the joint assistance of the inner limiting member and the outer limiting member. After the adjustment is completed, the position of the adjustable drill bit on the conical end can be effectively limited, further ensuring the stability and safety during the processing. Description of the Drawings

[0018] Figure 1 is the structural schematic diagram of the present utility model;

[0019] Figure 2 is the semi-sectional structural schematic diagram of the present utility model;

[0020] Figure 3 is the longitudinal sectional structural schematic diagram of the adjustable drill bit of the present utility model;

[0021] Figure 4 is the sectional schematic diagram of the outer limiting member of the present utility model;

[0022] Figure 5 For the present utility model Figure 2 is an enlarged schematic view of the M position.

[0023] In the figure: 1, conical end; 11, guiding groove; 2, connecting shaft rod; 20, groove; 3, outer limiting member; 31, second inclined surface; 4, inner limiting member; 40, limiting rod; 41, first inclined surface; 42, adjusting screw; 5, adjustable drill; 50, drill rod; 51, cutting blade; 52, second contact member; 53, first contact member. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present utility model.

[0025] Embodiment: Please refer to Figures 1-5 , the present utility model provides a technical solution: a double-layer reaming bit for civil engineering pile foundation construction, mainly aiming at the problems in the existing patents that the adjustment operation of the reaming bit is relatively cumbersome, there are too many components, and the reaming use cost is increased. The specific solution is as follows: It includes a conical end 1 and a connecting shaft rod 2. A keyway is provided on the connecting shaft rod 2, and it is fixed to the transmission shaft of the drilling rig through a key connection, thereby realizing the transmission of power. The conical end 1 and the connecting shaft rod 2 are fixedly installed. A guiding groove 11 is annularly provided on the conical end 1. An adjustable drill 5 is movably connected inside the guiding groove 11. The setting of the guiding groove 11 can guide the movement of the adjustable drill 5, so that the adjustable drill 5 always moves along a specific radial line.

[0026] Please refer to Figure 2 and Figure 3 , the adjustable drill 5 includes a drill rod 50, a first contact member 53 and a second contact member 52. The height of the drill rod 50 is less than the height of the conical end 1, and the lower end surfaces of the drill rod 50 and the conical end 1 are flush. The guiding groove 11 is a through groove, and the length of the guiding groove 11 is greater than the length of the second contact member 52. The drill rod 50 is annularly inserted on the conical end 1. The first contact member 53 and the second contact member 52 are fixedly installed above the drill rod 50, and the second contact member 52 is arranged outside the first contact member 53. A cutting blade 51 is provided on the outer side of the drill rod 50. The second contact member 52 is movably connected inside the guiding groove 11; by providing an adjusting force to the adjustable drill 5, it can move along the radial direction of the conical end 1, so that the adjustable drill 5 protrudes from the outer side of the conical end 1, thereby realizing the reaming processing operation.

[0027] Please refer to Figure 2 , wherein, an inner limiting member 4 and an outer limiting member 3 are respectively arranged on the inner and outer sides of the connecting shaft rod 2; the inner limiting member 4 and the outer limiting member 3 are used in cooperation to realize the radial movement adjustment of the adjustable drill bit 5.

[0028] Please refer to Figure 2 and Figure 5 , wherein, the inner limiting member 4 includes a limiting rod 40, and the outer diameter of the limiting rod 40 is smaller than the inner diameter of the connecting shaft rod 2. The upper end of the limiting rod 40 is rotatably connected with an adjusting screw rod 42, the adjusting screw rod 42 is threadedly connected with the connecting shaft rod 2, and a first inclined surface 41 is arranged on the lower end surface of the limiting rod 40, and the first inclined surface 41 contacts the first contact member 53; after rotating the adjusting screw rod 42, due to the threaded connection between the adjusting screw rod 42 and the connecting shaft rod 2, at this time, the adjusting screw rod 42 can drive the limiting rod 40 to move upward or downward along the axis direction of the connecting shaft rod 2.

[0029] Please refer to Figure 2 and Figure 4 , the outer limiting member 3 includes a limiting sleeve 30, the limiting sleeve 30 is threadedly connected with the connecting shaft rod 2, after providing a rotational driving force to the limiting sleeve 30, the limiting sleeve 30 can be made to move along the axis direction of the connecting shaft rod 2, a second inclined surface 31 is arranged at the lower inner end of the limiting sleeve 30, and the second inclined surface 31 contacts the second contact member 52. The connecting shaft rod 2, the limiting rod 40 and the limiting sleeve 30 are collinear at the center, and the length of the limiting rod 40 is smaller than the length of the connecting shaft rod 2. The first inclined surface 41 and the second inclined surface 31 form an angle less than 90 degrees. A groove 20 is opened at the upper end of the connecting shaft rod 2, the adjusting screw rod 42 is arranged inside the groove 20, and the adjusting screw rod 42 and the center of the groove 20 are collinear.

[0030] Working principle: For the double-expanded diameter drill bit used in the construction of civil engineering pile foundation, during use, the distance between the adjustable drill cutter 5 protruding from the outside of the conical end 1 can be adjusted as needed; specifically, when the adjusting screw 42 is rotated forward, so that the adjusting screw 42 drives the limiting rod 40 to move along the axis of the connecting shaft rod 2 towards one side of the conical end 1, at this time, through the push of the limiting rod 40, adjacent adjustable drill cutters 5 can move from the inside out at the same time. According to the protruding distance, the screwing-out length of the adjusting screw 42 is adjusted. It should be noted that in this adjusted state, the outer limiting member 3 is placed above the conical end 1, and the outer limiting member 3 does not limit the radial movement of the second contact member 52. After the adjustment is completed, by rotating the limiting sleeve 30, it moves along the axis of the connecting shaft rod 2 on the connecting shaft rod 2, so as to assist in limiting the position of the adjusted adjustable drill cutter 5; similarly, when adjusting the adjustable drill cutter 5 inward, the limiting rod 40 is made to release the position limitation on the first contact member 53, the limiting sleeve 30 is rotated, and it moves closer to the conical end 1 along the axial direction of the connecting shaft rod 2. After the adjustment is completed, by rotating the adjusting screw 42, the position of the adjustable drill cutter 5 is assisted to be limited by the limiting rod 40.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-expanded diameter drill bit for civil engineering pile foundation construction, comprising a conical end (1) and a connecting shaft rod (2), wherein the conical end (1) and the connecting shaft rod (2) are fixedly installed, and it is characterized in that: A guiding groove (11) is annularly formed on the conical end (1), and an adjustable drill bit (5) is movably connected inside the guiding groove (11). Inner limit members (4) and outer limit members (3) are respectively arranged on the inner and outer sides of the connecting shaft rod (2); The adjustable drill bit (5) includes a drill bit rod (50), a first contact member (53) and a second contact member (52). The drill bit rod (50) is annularly inserted on the conical end (1). The first contact member (53) and the second contact member (52) are fixedly installed above the drill bit rod (50), and the second contact member (52) is arranged outside the first contact member (53). A cutting blade (51) is arranged on the outer side surface of the drill bit rod (50), and the second contact member (52) is movably connected inside the guiding groove (11); The inner limit member (4) includes a limit rod (40). The upper end of the limit rod (40) is rotatably connected with an adjusting screw rod (42). The adjusting screw rod (42) is threadedly connected with the connecting shaft rod (2). A first inclined surface (41) is arranged on the lower end surface of the limit rod (40), and the first inclined surface (41) contacts the first contact member (53); The outer limit member (3) includes a limit sleeve (30). The limit sleeve (30) is threadedly connected with the connecting shaft rod (2). A second inclined surface (31) is arranged at the lower inner end of the limit sleeve (30), and the second inclined surface (31) contacts the second contact member (52).

2. The double-expanded diameter drill bit for civil engineering pile foundation construction according to claim 1, characterized in that: The connecting shaft rod (2), the limit rod (40) and the limit sleeve (30) are collinear at the center, and the length of the limit rod (40) is less than the length of the connecting shaft rod (2).

3. A double-expanded diameter drill bit for civil engineering pile foundation construction according to claim 1, characterized in that: The included angle between the first inclined surface (41) and the second inclined surface (31) is less than 90 degrees.

4. A double-expanded diameter drill bit for civil engineering pile foundation construction according to claim 1, characterized in that: The guiding groove (11) is a through groove, and the length of the guiding groove (11) is greater than the length of the second contact member (52).

5. A double-expanded diameter drill bit for civil engineering pile foundation construction according to claim 1, characterized in that: A groove (20) is formed at the upper end of the connecting shaft rod (2). The adjusting screw rod (42) is arranged inside the groove (20), and the adjusting screw rod (42) and the groove (20) are collinear at the center.

6. The double-expanded diameter drill bit for civil engineering pile foundation construction according to claim 1, characterized in that: The height of the drill bit rod (50) is less than the height of the conical end (1), and the lower end surfaces of the drill bit rod (50) and the conical end (1) are flush.

7. A double-expanded diameter drill bit for civil engineering pile foundation construction according to claim 1, characterized in that: The outer diameter of the limit rod (40) is less than the inner diameter of the connecting shaft rod (2).

Images