CN210768607U

CN210768607U - Pore-forming drilling tool for pre-drilling type lateral pressure test

Info

Publication number: CN210768607U
Application number: CN201921457615.1U
Authority: CN
Inventors: 蒋红俊; 吴晓亮; 岳翰昊
Original assignee: Zhenjiang Survey And Mapping Research Institute
Current assignee: Zhenjiang Survey And Mapping Research Institute
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-06-16
Anticipated expiration: 2029-09-03

Abstract

The utility model discloses a pore-forming drilling tool of pre-drilling formula side pressure test belongs to construction technical field, and its technical scheme main points are, including the drilling rod, the drilling rod top is equipped with movable head, and the drilling rod afterbody is equipped with the connector, and the fluted twist blade has been seted up to the drilling rod outer wall, and the fluted twist blade includes first cutting edge and second cutting edge, and the outer edge of first cutting edge is the slice, and the outer edge of second cutting edge is the twisted form, through first cutting edge and second cutting edge stack effect, increases the intensity of fluted twist blade to the drilling tool can accomplish drilling less times, in order to guarantee the pore-forming quality, makes side pressure test's data more accurate, the utility model is suitable for a side pressure test.

Description

Pore-forming drilling tool for pre-drilling type lateral pressure test

Technical Field

The utility model belongs to the technical field of the construction technology and specifically relates to a pore-forming drilling tool of brill formula side pressure test in advance is related to.

Background

The side pressure instrument test is a horizontal load test carried out in site special control, the existing side pressure instrument comprises three types of pre-drilling type, self-drilling type and press-in type, and the pre-drilling type is mainly used at home and abroad. The pre-drilling type lateral pressure instrument is used for drilling a vertical drilling hole meeting the requirement by using a drilling tool, putting a lateral pressure device into the designed elevation in the drilling hole and then performing a lateral pressure test.

Chinese patent No. CN102852456A discloses a core drilling machine, in which a drill rod is provided with a helical blade, and when a lateral pressure gauge needs to estimate the bearing capacity of a foundation of a construction site, a motor drives the drill rod to rotate, and a test hole is pre-drilled in the construction site through the high-speed operation of the helical blade.

The above prior art solutions have the following drawbacks: in the actual operation process, the rock core pipe of the drilling tool can smoothly place the side pressure device into the pre-drilled hole, the drilling tool needs to be repeatedly lifted during hole forming so as to improve the quality of the formed hole, the soil layer of the hole wall is disturbed, and the test data is influenced and is misaligned.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a boring tool of formula of boring side pressure test in advance, fried dough twist structural strength is higher, the reduction soil layer that has produces the effect of disturbance.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a bore-forming drilling tool of formula of boring in advance side pressure test, includes the drilling rod, the drilling rod top is equipped with movable head, the drilling rod afterbody is equipped with the connector, the drilling rod outer wall is provided with the fluted cutting edge along its circumference spiral, the fluted cutting edge includes first cutting edge and second cutting edge, the interior edge of first cutting edge with the interior coplane of following of second cutting edge, the outer edge of first cutting edge is the slice, the outer edge of second cutting edge is the twist form, the width of first cutting edge is 1.2 to 1.5 times of the width of second cutting edge.

By adopting the technical scheme, before building construction, for safety consideration, the bearing capacity of the foundation of the construction land needs to be detected so as to determine whether the foundation can recover to an elastic balance state after being deformed under the load action of the construction land, and the construction land still has safe bearing capacity. The pre-drilling type lateral pressure detection is a commonly used method for detecting the bearing capacity of a foundation of a construction ground, the pre-drilling type lateral pressure detection needs to be performed through a drilling tool to form holes, and the quality of the formed holes has decisive influence on a detection result. The outer wall of the drill rod is provided with the twist cutting edge, and the special structure of the twist cutting edge is convenient for hole forming in a building place. The twist cutting edge comprises a first cutting edge and a second cutting edge, wherein the first cutting edge is flaky, the second cutting edge is twisted in the process of drilling by the aid of the two groups of cutting edges. The width of first cutting edge is 1.2 times to 1.5 times of second cutting edge width, and the outer edge of the first cutting edge of twist blade contacts the stratum before during drilling of drilling tool, and first cutting edge separates out some opening with the soil block earlier after, and the outer edge of second cutting edge contacts the stratum again, increases the intensity of first cutting edge, and the drilling tool of being convenient for is singly gone back and is bored the pore-forming with stereoplasm soil layer, reduces the number of times that the drilling tool carried the brill, improves the quality of drilling tool pore-forming. When the first blade continuously separates the soil layer, the soil blocks separated firstly and the soil blocks not separated are connected into a whole, so that the difficulty of opening the holes of the first blade is increased. The outer edge of the second blade is in a twist shape, so that separated soil blocks are conveniently crushed, and the first blade can continuously and quickly separate the soil blocks. If the outer edge of the first cutter edge is in a twist shape, soil disturbance is easily caused when the drilling tool drills holes again, the outer edge of the first cutter edge is arranged into a sheet shape, the degree of soil disturbance is reduced, and the hole forming quality of the drilling tool is improved.

The utility model discloses further set up to, be equipped with the through-hole in the drilling rod, the center pin of through-hole with drilling rod center pin collineation, activity head one end is including conical brill top, movable rod and piston, the one end of movable rod with the bottom of boring the top is connected, the other end of movable rod with the piston connection, the through-hole cross section is trapezoidal, the activity head is located the shorter one end of through-hole diameter, the piston is located in the through-hole, the diameter of piston is the through-hole is by 1.1 times through activity head one end diameter, the piston with when the butt is followed outward to the through-hole, the part the movable rod is located the through-hole outside.

By adopting the technical scheme, a pre-drilling hole side pressure test needs to be preformed into a hole, the soil layer side wall needs to be kept in a vertical state, the side pressure device can be smoothly placed into the hole, for a soft soil layer, the soil layer side wall needs to be ensured to be vertical by adopting a mud protective wall, when the through hole is used for external equipment, the mud can conveniently pass through, the movable head comprises a drill top, a movable rod and a piston, the piston is positioned in the through hole, when the drilling tool does not drill, the outer edge of the piston is abutted against the outer edge of the through hole, part of the movable rod is positioned outside the through hole, when the drilling tool starts to drill, the drill top is abutted against a ground surface, the movable rod and the piston move towards one end of the connector, as the cross section of the through hole is trapezoidal, and the end with a shorter diameter is close to the movable head, when the piston moves towards one end of the connector, the, the accuracy of the test data is ensured.

The utility model discloses further set up to, the one end that the movable head was kept away from to the connector is equipped with the connecting pipe, a plurality of round holes have been seted up on the connecting pipe.

Through adopting above-mentioned technical scheme, for the cooperation external device, connector position department is equipped with the connecting pipe that the mud of being convenient for got into, and the flow that the connecting pipe passes through the round hole control mud on the pipe wall and gets into the through-hole.

The utility model discloses set up further to, drilling rod length is 150 centimetres to 160 centimetres, the pitch of fluted cutting edge is 10 centimetres to 12 centimetres.

Through adopting above-mentioned technical scheme, the fluted cutting edge contacts the soil layer to rotate simultaneously, the pitch of fluted cutting edge is less, and the separated clod is garrulous more, and pore-forming more easily, and when the pitch of fluted cutting edge is less, the soil layer produced the disturbance easily in the drilling process, thereby influences experimental data. When the thread pitch of the twist blade is larger than 12 cm, the drilling tool cannot reach the preset depth in a single time, and a plurality of times are needed, so that the quality of hole forming is also influenced.

The utility model discloses further set up to, first cutting edge with the cross section of second cutting edge is triangle-shaped, first cutting edge with the gross thickness on the interior edge of second cutting edge is 3 centimetres to 4 centimetres.

Through adopting above-mentioned technical scheme, the cross section of first cutting edge and second cutting edge is triangle-shaped, through this setting for first cutting edge and second cutting edge deviate from the drilling rod outer wall and become thin gradually, and the gross thickness that first cutting edge and second cutting edge are close to the position of drilling rod outer wall is 3 centimetres to 4 centimetres, makes the intensity of fluted-edge is higher. The outer edges of the first cutting edge and the second cutting edge are thin, so that the drilling tool can rapidly separate soil layers.

The utility model discloses further set up to, the second cutting edge is located the top that the ground was kept away from to first cutting edge.

Through adopting above-mentioned technical scheme, the second cutting edge is located the below that first cutting edge is close to ground, and when first cutting edge carried out the brick hole to the clod, the clod of second cutting edge outside the hole continued to stir the bits of broken glass, arouses the soil body disturbance easily, reduces drilling tool pore-forming quality.

The utility model discloses further set up to, be equipped with a plurality of bits holes of holding on the first sword, it is close to hold the bits hole along position department in the first sword.

By adopting the technical scheme, the inner edges of the first blade and the second blade are coplanar, the cross sections of the first blade and the second blade are triangular, the closer the first blade and the second blade to the inner edge, the shorter the distance between the first blade and the second blade, when the drilling tool drills, soil blocks separated from soil layers are gathered in the gap between the first blade and the second blade, when the soil blocks gathered in the gap between the first blade and the second blade are more, the outer edge of the second blade is covered, the second blade cannot play a role, a chip containing hole is formed in the position, close to the inner edge, of the first blade, and when the soil blocks gathered in the gap between the first blade and the second blade are located at the chip containing hole, the soil blocks can be displaced to one side, far away from the second blade, of the first blade through the chip containing hole.

The utility model discloses further set up to, the fluted-blade material is carbide.

By adopting the technical scheme, due to the difference of the properties of the soil layers, the hardness of the soil layers is different, and the twist cutting edges are made of hard alloy with stronger hardness, so that the drilling tool can complete drilling in fewer rounds.

To sum up, the utility model discloses following beneficial effect has:

1. through the arrangement of the first cutting edge and the second cutting edge, the soil block is firstly separated from the soil layer preliminarily through the first cutting edge, and the soil block is completely separated from the soil layer through the second cutting edge to assist the first cutting edge, so that a drilled hole is formed, and the effect of quickly forming the hole can be achieved;

2. through the arrangement of the movable head and the through hole, the cross section of the through hole is trapezoidal, when a piston of the movable head is abutted against the through hole, the movable rod part is positioned in the through hole, when the drilling tool drills, the drill is abutted against the ground surface, and the piston moves towards the direction of the connector, so that the effect of facilitating slurry in external equipment to enter the through hole can be achieved;

3. through the arrangement of the chip containing hole, when the soil block between the first cutting edge and the second cutting edge is gathered to the chip containing hole, the soil block can be moved to one side of the first cutting edge far away from the second cutting edge through the chip containing hole, the phenomenon that the outer edge of the second cutting edge is covered by the soil block is reduced, and the effect of continuously using the second cutting edge can be achieved.

Drawings

Fig. 1 is a schematic view of the overall structure of the drilling tool of the present invention.

Fig. 2 is a schematic sectional view of the drilling tool of the present invention.

In the figure, 1, a drill rod; 11. a through hole; 2. a twist blade; 21. a first blade; 22. a second blade; 3. a movable head; 31. drilling a top; 32. a movable rod; 33. a piston; 4. a connector; 41. a connecting pipe; 42. a circular hole; 43. chip-containing holes.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b): the utility model discloses a boring tool of formula of boring side pressure test in advance, refer to fig. 1, including drilling rod 1, 1 external division of drilling rod is equipped with fluted knife edge 2, fluted knife edge 2 includes first cutting edge 21 and second cutting edge 22, in this embodiment, first cutting edge 21 width is 1.5 times of second cutting edge 22 width, when the drilling tool drills, the aperture that first cutting edge 21 formed is greater than the aperture that second cutting edge 22 formed, when first cutting edge 21 separates the soil block of pore-forming with the soil layer, second cutting edge 22 stirs the soil block garrulous, the first cutting edge 21 of being convenient for continues to move down, separates the soil block of depths. When no second cutting edge 22 is arranged, the drilling tool is used for stirring and crushing separated soil blocks in a progressive mode through rotating the twist structure integral with the first cutting edge 21, the soil blocks at the positions close to the movable head 3 are more complete, and when the soil layer with high hardness is encountered, the torsional force of the drilling tool is insufficient, multiple lifting is possibly needed, the hole forming of the building is realized, the drilling tool is lifted for multiple times, the soil layer is easy to generate disturbance, and the data detected by the lateral pressure instrument is easy to influence. First cutting edge 21 and the coplane of second cutting edge 22 inner edge, first cutting edge 21 outer edge are the slice, and the soil block of drilling is separated out to the soil layer fast easily to the slice, and when soil layer hardness was stronger after further deepening the drilling again, blocked easily, can't twist reverse. If the soil layer is directly arranged to be in a fine twist shape, the soil layer is easy to generate disturbance, and the result of the side pressure test is influenced. The outer edge of second cutting edge 22 is the twist form, as supplementary cutting edge, solves the not enough problem of first cutting edge 21 torsional force, when first cutting edge 21 separates soil block and soil layer, can directly stir garrulous with the soil block to the drilling tool can realize the effect of single time pore-forming.

Referring to fig. 1, the cross sections of the first cutting edge 21 and the second cutting edge 22 are both triangular, the first cutting edge 21 and the second cutting edge 22 are gradually thinned away from the outer wall of the drill rod 1, the outer edges of the first cutting edge 21 and the second cutting edge 22 are thinner, the hole forming of a drilling tool is facilitated, and the inner edges of the first cutting edge 21 and the second cutting edge 22 are thickened, so that the strength of the drilling tool is increased. Meanwhile, the twist cutting edge 2 is made of hard alloy, so that the hardness of the drilling tool is further increased. The first blade 21 is provided with a plurality of chip containing holes 43 at positions close to the inner edge, in the drilling process, soil lumps can be gathered in a gap between the first blade 21 and the second blade 22, when the soil lumps are gathered more, the second blade 22 is easily covered, so that the second blade 22 cannot act, the chip containing holes 43 are arranged at positions close to the inner edge of the first blade 21, and when the soil lumps are gathered at the positions of the chip containing holes 43, the soil lumps are moved to one side of the first blade 21, which is far away from the second blade 22, through the chip containing holes 43, so that the second blade 22 can continuously work in the drilling process.

Referring to fig. 2, the connector 4 of the drill rod 1 is used for connecting external equipment for providing slurry, when drilling a soft soil layer and taking out a drilling tool after pore-forming, the bottom of the soft soil layer is in a vacuum state, the pore diameter is easy to shrink, and the side pressure device is influenced to be smoothly put into the hole. The one end of keeping away from movable head 3 at connector 4 is equipped with connecting pipe 41, is equipped with a plurality of round holes 42 on the connecting pipe 41, and external equipment when being connected to on connector 4, in the connecting pipe 41 displacement external equipment interface, through the quantity of round hole 42 on the connecting hole, can control the flow of mud, accord with the standard that uses. Be equipped with through-hole 11 in the drilling rod 1, in the mud introduction through connecting pipe 41 introduction through-hole 11, it is downthehole through activity head 3 admission again, through-hole 11 cross section is trapezoidal, and the great one end of through-hole 11 diameter is close to connector 4, and the less one end of through-hole 11 diameter is close to activity head 3. The movable head 3 includes the drill top 31, the movable rod 32 and the piston 33, the piston 33 is located the through-hole 11, the piston 33 is connected with the active one end, in this embodiment, when the piston 33 is outer along with the through-hole 11 outer along the butt, half length part of the movable rod 32 is located the through-hole 11, half length another part of the movable rod 32 is located outside the through-hole 11, the other end of the movable rod 32 that is located the through-hole 11 outside is connected in the drill top 31, be equipped with the opening that is convenient for mud outflow on the drill top 31. The total length of the drill rod 1 of the drilling tool is 150 cm to 160 cm, the length of the drill rod 1 in the embodiment is 150 cm, two factors of soil layer disturbance and convenience in excavation are balanced, the thread pitch of the twist blade 2 located on the outer wall of the drill rod 1 is set to be 10 cm, the hole can be formed through the drilling tool in a few times while the soil layer disturbance is reduced, and the hole forming quality of the drilling tool is improved.

The specific implementation manner of the above embodiment is as follows: when the foundation bearing capacity of building ground soil layer needs to be detected, it is experimental to use the formula of boring other barometer in advance, need use the drilling tool earlier to drill the soil layer, during the drilling of drilling tool, external device is connected earlier to the drilling tool, the ground that 3 position butt of activity head were prepared to the detection again, the hole is chisel to the rotatory mode of rethread, first cutting edge 21 is the main cutting edge during the chisel hole, form the hole of great diameter, second cutting edge 22 separates once more to the soil layer of first cutting edge 21 separation, be convenient for first cutting edge 21 continues to dig to the depths, form the hole of the degree of depth that other barometer is experimental needs, rethread other barometer stretches into downtheholely, detect the foundation bearing capacity of soil layer.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a boring tool of formula of boring side pressure test in advance, includes drilling rod (1), its characterized in that: drilling rod (1) top is equipped with movable head (3), drilling rod (1) afterbody is equipped with connector (4), drilling rod (1) outer wall is provided with fluted cutting edge (2) along its circumference spiral, fluted cutting edge (2) include first cutting edge (21) and second cutting edge (22), the interior edge of first cutting edge (21) with the interior coplane of following of second cutting edge (22), the outer edge of first cutting edge (21) is the slice, the outer edge of second cutting edge (22) is the twist form, the width of first cutting edge (21) is 1.2 to 1.5 times of the width of second cutting edge (22).

2. The pre-drilling type lateral pressure test hole-forming drilling tool according to claim 1, wherein: a through hole (11) is arranged in the drill rod (1), the central axis of the through hole (11) is collinear with the central axis of the drill rod (1), one end of the movable head (3) comprises a conical drill top (31), a movable rod (32) and a piston (33), one end of the movable rod (32) is connected with the bottom of the drill top (31), the other end of the movable rod (32) is connected with the piston (33), the cross section of the through hole (11) is trapezoidal, the movable head (3) is positioned at one end of the through hole (11) with shorter diameter, the piston (33) is positioned in the through hole (11), the diameter of the piston (33) is 1.1 times of that of one end of the through hole (11) close to the movable head (3), when the piston (33) is abutted against the outer edge of the through hole (11), part of the movable rod (32) is positioned outside the through hole (11).

3. The pre-drilled lateral pressure test hole-forming drill as claimed in claim 2, wherein: the connecting pipe (41) is arranged at one end, far away from the movable head (3), of the connecting head (4), and a plurality of round holes (42) are formed in the connecting pipe (41).

4. The pre-drilled lateral pressure test hole-forming drill as claimed in claim 3, wherein: the length of the drill rod (1) is 150 cm to 160 cm, and the thread pitch of the twist blade (2) is 10 cm to 12 cm.

5. The pre-drilled lateral pressure test hole-forming drill as claimed in claim 4, wherein: the cross sections of the first cutting edge (21) and the second cutting edge (22) are both triangular, and the total thickness of the inner edges of the first cutting edge (21) and the second cutting edge (22) is 3 cm-4 cm.

6. The pre-drilled lateral pressure test hole-forming drill as claimed in claim 5, wherein: the second blade (22) is located above the first blade (21) away from the ground.

7. The pre-drilled lateral pressure test hole-forming drill as claimed in claim 6, wherein: the first cutting edge (21) is provided with a plurality of chip containing holes (43), and the chip containing holes (43) are close to the inner edge of the first cutting edge (21).

8. The pre-drilled lateral pressure test hole-forming drill as claimed in claim 7, wherein: the twist cutting edge (2) is made of hard alloy.