A hole enlarging steel drill and hole enlarging method using the same

Abstract

The invention discloses a hole-reaming steel drill and a hole-reaming method using the same. The drill rod comprises a drill rod and a hole-reaming head. The drill rod is a solid rod body. The hole-reaming head is a conical structure with a sleeve hole at the center. The diameter of the drill rod is smaller than the outer diameter of the hole-reaming head. The lower end of the drill rod is provided with a sleeve rod with a diameter smaller than the drill rod. The sleeve rod extends into the sleeve hole. The diameter of the sleeve hole is larger than the diameter of the sleeve rod. After hole-reaming, the drill rod can be separated from the hole-reaming head and the sleeve head is left at the bottom of the buried hole, so that the drill rod can be taken out conveniently and the hole-reaming efficiency is improved. The hole-reaming method of the invention has high construction efficiency and a more compact hole wall.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering construction, in particular to a hole enlarging steel chisel and a hole enlarging method using the same. Background Art

[0002] Existing steel drill (such as Figure 1 ) is an integrated structure with a pointed tip at the lower end. The steel chisel is sometimes used to expand the hole. When expanding the hole, the steel chisel gradually penetrates into the hole through external force, and the hole wall forms pressure on the surface of the steel chisel, especially for underground buried holes. After the hole expansion is completed, the stratum around the buried hole exerts a large pressure on the surface of the steel chisel, and the steel chisel is not easy to remove.

[0003] With the development of electricity and communications, infrastructure such as electric poles and street light poles can be seen everywhere. When constructing electric poles and street light poles, holes must be dug underground first so that they can be stable. However, the size of the buried holes is small and it is impossible to use mechanical equipment to dig holes. The existing construction method is to dig holes manually, and the soil layer around the buried holes is soft and needs to be compacted, so the construction efficiency is very low. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a hole-expanding steel drill and a hole-expanding method using the same.

[0005] The technical scheme of the present invention is: a hole reaming method, comprising a hole reaming steel drill, the hole reaming steel drill comprising a drill rod and a hole reaming head, the drill rod is a solid rod body, the hole reaming head is a conical structure with a sleeve hole in the center, the diameter of the drill rod is smaller than the outer diameter of the hole reaming head, the lower end of the drill rod is provided with a sleeve rod with a diameter smaller than the drill rod, the sleeve rod extends into the sleeve hole, and the diameter of the sleeve hole is larger than the diameter of the sleeve rod; the lower end surface of the drill rod is provided with a sleeve ring, the sleeve rod is located inside the sleeve ring, and the upper end surface of the hole reaming head is provided with an annular groove that matches the sleeve ring gap; specifically comprising the following steps:

[0006] Step 1, find the hole expansion position on the ground;

[0007] Step 2, using detonating cord to perform primary hole expansion and blast out a primary hole;

[0008] Step 3, filling the primary hole with cement soil and installing an inline explosive package in the center;

[0009] Step 4, using inline explosive packages to carry out inline charge blasting to expand the hole and blast out a secondary hole;

[0010] Step 5, place the reaming head into the secondary orifice, insert the sleeve rod of the drill rod into the sleeve hole, put the sleeve ring into the annular groove, and apply pressure to the drill rod;

[0011] Step 6, continuously applying periodic pressure to the drill rod until the hole expansion is completed, and the secondary hole is expanded to a formed hole;

[0012] Step 7, remove the drill rod and leave the reaming head at the bottom of the formed hole.

[0013] Preferably, the gap between the sleeve rod and the sleeve hole is larger than the gap between the sleeve ring and the annular groove.

[0014] Preferably, in steps 5 and 6, pressure is applied to the drill rod by a hydraulic hammer / press.

[0015] The beneficial effects of the present invention are:

[0016] After the hole is expanded, the drill rod can be separated from the expansion head, and the expansion head is left at the bottom of the buried hole, so that the drill rod can be easily taken out and the expansion efficiency is improved.

[0017] The buried hole is generally used to bury the rod body, and the expansion head is left at the bottom of the buried hole without affecting the use of the buried hole.

[0018] The annular groove on the reaming head and the collar of the drill rod are matched with each other and the gap between the two is smaller than the gap between the sleeve rod and the sleeve hole. The annular groove and the collar can provide a limiting effect for the sleeve rod and the sleeve hole to prevent the sleeve rod and the sleeve hole from sticking together under the action of external pressure.

[0019] The hole expansion method of the present invention utilizes detonating cord to expand the hole by blasting, which can respectively compact the soil layer around the primary hole, utilizes in-line explosive packs to expand the hole by blasting, which can compact the cement soil, and the expansion head is left at the bottom of the formed hole, which reduces the time of taking out the expansion head and improves the construction efficiency. The expansion steel chisel is used to expand the hole to form a regular formed hole, the whole construction process is highly efficient, and the hole wall is more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of the existing steel drill;

[0021] Figure 2 It is a schematic diagram of the main structure of the hole-expanding steel drill in the present invention;

[0022] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the middle hole expansion steel drill;

[0023] Figure 4 for Figure 3 A partial enlarged view of

[0024] Figure 5 It is a schematic diagram of the top view of the expansion head;

[0025] Figure 6 This is a schematic diagram of the detonating cord after hole expansion;

[0026] Figure 7 This is a schematic diagram of the charge for hole expansion in inline charge blasting;

[0027] Figure 8 This is a schematic diagram of the hole after the inline charge blasting expansion;

[0028] Fig. 9 This is a schematic diagram of the steel drill expanding the hole;

[0029] Fig.10 This is a schematic diagram of the steel drill after hole expansion;

[0030] In the figure: 1. drill rod, 1-1. sleeve rod, 1-2. sleeve ring, 2. reamer, 2-1. sleeve hole, 2-2. annular groove, 3. ground, 4. primary hole, 5. cement soil, 6. in-line explosive package, 7. secondary hole, 8. formed hole. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is shown in Figure 2-10 :

[0032] A hole-expanding steel drill, such as Figure 2-5 , comprising a drill rod 1 and a reaming head 2, the drill rod 1 being a solid rod body, the reaming head 2 being a conical structure with a sleeve hole 2-1 provided at the center, the diameter of the drill rod 1 being smaller than the outer diameter of the reaming head 2, the lower end of the drill rod 1 being provided with a sleeve rod 1-1 having a diameter smaller than that of the drill rod 1, the sleeve rod 1-1 extending into the sleeve hole 2-1, the diameter of the sleeve hole 2-1 being larger than the diameter of the sleeve rod 1-1, the lower end surface of the drill rod 1 being provided with a sleeve ring 1-2, the sleeve rod 1-1 being located inside the sleeve ring 1-2, the upper end surface of the reaming head 2 being provided with an annular groove 2-2 which is gap-matched with the sleeve ring 1-2, the gap between the sleeve rod 1-1 and the sleeve hole 2-1 being larger than the gap between the sleeve ring 1-2 and the annular groove 2-2.

[0033] After reaming, the present invention can make the drill rod 1 detach from the reaming head 2 and leave the reaming head 2 at the bottom of the buried hole, which is convenient for taking out the drill rod 1 and improving the reaming efficiency. The buried hole is generally used to fill the rod body, and the reaming head 2 left at the bottom of the buried hole will not affect the use of the buried hole. The annular groove 2-2 on the reaming head 2 and the collar 1-2 of the drill rod 1 are clearance-matched and the gap between the two is smaller than the gap between the sleeve rod 1-1 and the sleeve hole 2-1. The annular groove 2-2 and the collar 1-2 can provide a limiting effect for the sleeve rod 1-1 and the sleeve hole 2-1 to prevent the sleeve rod 1-1 and the sleeve hole 2-1 from sticking together under the action of external pressure.

[0034] The specific method for using the hole-expanding steel drill of the present invention during construction comprises the following steps:

[0035] Step 1, find the hole expansion position on the ground 3;

[0036] Step 2, using a detonating cord to perform primary hole expansion and blast out a primary hole 4;

[0037] Step 3, filling cement soil 5 into the primary hole 4 and installing an inline explosive package 6 in the center;

[0038] Step 4, using the inline explosive package 6 to carry out inline charge blasting to expand the hole, and blast out the secondary hole 7;

[0039] Step 5, place the reaming head 2 into the secondary hole 7, insert the sleeve rod 1-1 of the drill rod 1 into the sleeve hole 2-1, put the sleeve ring 1-2 into the annular groove 2-2, and apply pressure to the drill rod 1 by a hydraulic hammer or a press;

[0040] Step 6, continuously applying periodic pressure to the drill rod 1 until the hole expansion is completed, and the secondary hole 7 is expanded to the formed hole 8;

[0041] Step 7, take out the drill rod 1, and leave the reaming head 2 at the bottom of the forming hole 8.

[0042] Using detonating cord for blasting hole expansion can compact the soil layer around the primary hole 4 respectively, using in-line explosive packs 6 for blasting hole expansion can compact the cement soil 5, and the expansion head 2 is left at the bottom of the forming hole 8, which reduces the time of taking out the expansion head 2 and improves the construction efficiency. Using the expansion steel chisel to expand the hole to form a regular forming hole 8, the whole construction process is efficient and the hole wall is more dense.

Claims

1. A hole enlarging method, characterized in that: The invention comprises a hole-expanding steel drill, wherein the hole-expanding steel drill comprises a drill rod and a hole-expanding head, wherein the drill rod is a solid rod body, the hole-expanding head is a conical structure with a sleeve hole at the center, the diameter of the drill rod is smaller than the outer diameter of the hole-expanding head, the lower end of the drill rod is provided with a sleeve rod with a diameter smaller than the drill rod, the sleeve rod extends into the sleeve hole, and the diameter of the sleeve hole is larger than the diameter of the sleeve rod; a sleeve ring is provided on the lower end surface of the drill rod, the sleeve rod is located inside the sleeve ring, and an annular groove is provided on the upper end surface of the hole-expanding head to match the sleeve ring gap; the following steps are specifically adopted: Step 1, find the hole expansion position on the ground; Step 2, using detonating cord to perform primary hole expansion and blast out a primary hole; Step 3, filling the primary hole with cement soil and installing an inline explosive package in the center; Step 4, using inline explosive packages to carry out inline charge blasting to expand the hole and blast out a secondary hole; Step 5, place the reaming head into the secondary orifice, insert the sleeve rod of the drill rod into the sleeve hole, put the sleeve ring into the annular groove, and apply pressure to the drill rod; Step 6, continuously applying periodic pressure to the drill rod until the hole expansion is completed, and the secondary hole is expanded to a formed hole; Step 7, remove the drill rod and leave the reaming head at the bottom of the formed hole.

2. The hole enlarging method according to claim 1, characterized in that: The gap between the sleeve rod and the sleeve hole is larger than the gap between the sleeve ring and the annular groove.

3. The hole enlarging method according to claim 1, characterized in that: In steps 5 and 6, pressure is applied to the drill rod by means of a hydraulic hammer / press.

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