JP2006132218A - Joint structure, method of forming the same, and anchor body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure which has a simple structure, is easy to handle, positively exerts a reverse loosening preventing function, and is applicable to an anchor body (e.g. an anchor rod, a rockbolt, etc.). <P>SOLUTION: The joint structure 1 is formed of: rod members 2, 3 on which external threads are formed; a cylindrical member 4 having formed therein a through hole 7 in which internal threads are formed, for connecting the rod members 2, 3 together; and fastening fixtures 5, 6. In the cylindrical member 4, the rod members 2, 3 are arranged so as to make surface contact with each other via their inclined end faces 8, 9, so that the rod members are not relatively rotated with respect to each other about their axes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a joint structure that can be applied to anchor bodies such as anchor rods and lock bolts that are mainly used in the fields of civil engineering and architecture.

Stabilize earth retaining members (for example, H-shaped steel), sprayed surfaces (for example, slopes made of cement-based hardened layers), exposed ground slopes, etc. in civil engineering work for building underground parts of buildings, etc. An anchor body having one end reaching a point of an appropriate depth in the ground and having the other end fixed to the building member, spraying surface, etc. (for example, stabilizing a building member) For example, an anchor rod for locking, a locking bolt for stabilizing a spraying surface, and the like) are known.
In addition, there is a solidified body of the injected grout material around the underground portion of the anchor rod, and this solidified body serves as an anchor to firmly bond the building member and the ground, Ensures stability.
The long anchor body is manufactured by connecting a plurality of rod-shaped members (for example, a threaded steel rod threaded at least near both ends). This connection location is configured as, for example, a joint structure 30 shown in FIG. In FIG. 6, a rod-shaped member (threaded steel rod) 31 is formed from one side of the through hole to the middle of the entire length of the through hole with respect to the cylindrical member 33 having the through hole 40 in which the female screw is threaded. While being screwed in, another bar-like member (screw steel bar) 32 is screwed in from the other side of the through hole until it comes into contact with the bar-like member 31 or reaches the vicinity thereof. The bolts 34, 35, 36, and 37 are screwed into the bolt insertion holes of the cylindrical member 33, and the tips of these bolts come into contact with the outer peripheral surfaces of the rod-shaped members 31 and 32, thereby 32 are fixedly connected to each other. Note that the end surfaces 38 and 39 of the rod-shaped members 31 and 32 are formed as surfaces perpendicular to the axis.
However, in order to produce the joint structure 30 shown in FIG. 6, the bolts 34, 35, 36, and 37 must be firmly tightened, and much labor is required. Further, when the bolts 34 and 35 are loosely tightened, the fixed state of the rod-shaped member 31 with respect to the cylindrical member 33 is loosened. As a result, the rod-shaped member 31 is rotated by being affected by vibration during drilling. There is a possibility that the joint structure 30 is loosened by moving downward (in the loosening direction).
For this reason, the rod-shaped members 31 and 32 are stably and firmly fixed to the cylindrical member 33 with a function of preventing such a phenomenon (reverse loosening prevention function) and without requiring much labor. There is a need for a joint structure that can be used.

On the other hand, in the field of civil engineering and construction, joints including joint nuts and lock nuts have been used in recent years in place of welding joints for reinforcing bars in the construction work of long foundations and columns having RC structures (reinforced concrete). The structure is widely adopted. In this joint structure, first, a threaded steel rod is screwed from one end of a joint nut (a cylindrical member having a through hole into which a female thread is threaded) to the center, and then another threaded steel rod is threaded from the other end. In order to prevent each threaded steel rod from loosening, fix it with lock nuts at both ends of the joint nut so that each threaded steel rod does not loosen. It is configured by filling and applying a grout material to the lock nut (see FIG. 4 of Patent Document 1).
However, this joint structure requires complicated operations such as filling of grout material. Therefore, in a joint for abutting the end faces of two threaded steel bars, after screwing one threaded steel bar to the approximate center of a nut joint having an inner thread that matches the thread diameter of each threaded steel bar, A joint of a screw steel rod for civil engineering construction in which at least an inner screw of the nut joint is deformed and the one screw steel rod and the nut joint are caulked is proposed (see FIG. 1 of Patent Document 1).
JP 2000-8546 A

As described above, the joint structure shown in FIG. 6 requires a lot of labor at the time of construction, and if the bolts are loosely tightened, there is a possibility that the function of reverse rotation locking may not be exhibited.
Moreover, the joint of the screw steel rod for civil engineering construction described in FIG. 1 of the above-mentioned document may not be able to prevent the screw steel rod from being reversely loosened if the deformation of the inner screw by the caulking is insufficient. There is. Further, when the nut joint has a large wall thickness, it is considered that the crimping work is difficult.
Therefore, the present invention is a joint structure that can be applied to an anchor body such as an anchor rod, a lock bolt, etc., has a simple structure, is easy to work at the time of construction, and has a function of preventing reverse loosening. It aims at providing the joint structure which can be exhibited reliably.

  As a result of intensive studies to solve the above problems, the inventor formed an end surface of a rod-shaped member such as a threaded steel rod on an inclined surface that forms a predetermined angle with respect to a surface perpendicular to the axis, If a joint structure is formed using two rod-shaped members having such inclined end surfaces and a cylindrical member that can be screwed to these two rod-shaped members, the work at the time of construction is easy, The present invention has been completed by finding that excellent effects such as the ability to reliably exert the reverse locking function can be obtained.

That is, the present invention provides the following [1] to [6].
[1] From two rod-shaped members having a male screw threaded on the outer peripheral surface and a cylindrical member having a through-hole having a female screw threaded on the inner peripheral surface for connecting the two rod-shaped members. The two rod-shaped members each have an inclined end surface that forms a predetermined angle with respect to a plane perpendicular to the axis, and from one side of the through hole of the cylindrical member, One member of the two rod-shaped members is screwed to a predetermined depth, and the other member of the two rod-shaped members is a predetermined depth from the other side of the through hole of the cylindrical member. Screwed and inside the cylindrical member, the two rod-shaped members are close to each other so that they do not rotate relative to each other about the axis (when the rod-shaped members are in contact with each other) And a case where a thin intermediate member is interposed between rod-like members.) A joint structure characterized by being arranged.
[2] The joint structure according to [1], wherein end surfaces of the two rod-shaped members are in contact with each other, and a continuous male screw is formed across the two rod-shaped members.
[3] The joint structure according to [1] or [2], wherein the cylindrical member is fastened from both sides by a pair of fasteners screwed to the two rod-like members.
[4] The joint structure according to any one of [1] to [3], wherein the angle of the end surface of the rod-shaped member is 10 to 60 degrees.
[5] In order to stabilize the ground surface forming body (for example, earth retaining members such as H-shaped steel, sprayed surfaces using cementitious compositions, exposed ground slopes, etc.) An anchor body (for example, an anchor rod or a lock bolt) that penetrates into the ground until one end reaches the point and is fixed to the surface forming body at the other end, such as an anchor rod or a lock bolt. The anchor body characterized by including the joint structure in any one of-[4].
[6] A method for forming the joint structure according to any one of [1] to [4], wherein (a) the cylindrical member is completely screwed into one member of the two rod-shaped members. (B) exposing the end face of the rod-shaped member from the cylindrical member; and (b) making the end face of the other member of the two rod-shaped members close to and face the exposed end face; ) Moving the cylindrical member toward the other member of the two rod-shaped members, thereby bringing the cylindrical member into a screwed state across the two rod-shaped members; and (d) A joint structure comprising a step of screwing a fastener into each of two rod-shaped members, and fastening the tubular member from both sides with the pair of fasteners to complete the joint structure. Forming method.

In the joint structure of the present invention, since the two rod-shaped members are arranged so that the inclined end faces are close to each other so as not to rotate relative to each other about the axis, the function of reverse loosening prevention is surely exhibited. be able to.
In addition, the joint structure of the present invention can be easily and quickly manufactured by a simple operation that does not require skill without requiring much labor.
Furthermore, the joint structure of the present invention has a simple structure, requires a small number of parts and materials, and can be manufactured at low cost.

  Hereinafter, an example of the joint structure of the present invention will be described with reference to the drawings. 1 is a cross-sectional view showing an example of the joint structure of the present invention, FIG. 2 is an enlarged view showing the vicinity of an end face of a rod-like member in the joint structure shown in FIG. 1, and FIG. 3 is a joint structure shown in FIG. FIG. 4 is a diagram for explaining an anchor rod construction method including the joint structure of the present invention, and FIG. 5 is an example of an anchor drill-equipped vehicle used for anchor rod construction. FIG.

In FIG. 1, the joint structure 1 is composed of two rod-like members 2 and 3 that are objects to be connected, a cylindrical member 4, and a pair of fasteners (for example, nuts, binding tapes, and the like) 5 and 6. Has been. Note that the upper portion of the rod-shaped member 3 and the lower portion of the rod-shaped member 2 are not shown.
Each of the rod-shaped members 2 and 3 is a long rod-shaped body having a predetermined length, and a male screw is threaded on an outer peripheral surface of a predetermined region including at least one end (preferably both ends). The rod-like members 2 and 3 may be rods having no space inside, or may be hollow tubes. Examples of the rod-like members 2 and 3 include a threaded steel rod. In addition, as a kind of thread steel bar, the steel thread bar etc. which threaded only the all thread steel bar, or both ends vicinity are mentioned.
The rod-shaped members 2 and 3 have inclined end surfaces 8 and 9 that form a predetermined angle (α and α ′ in FIG. 2) with respect to a plane perpendicular to the axis (A in FIG. 2). The end surfaces 8 and 9 are usually formed as flat surfaces.
The angles α and α ′ of the end faces 8 and 9 with respect to the plane perpendicular to the axis are preferably 10 to 60 degrees, more preferably 15 to 50 degrees, and particularly preferably 20 to 40 degrees.
If the angle is less than 10 degrees, the rod-like members 2 and 3 may rotate relative to each other about the axis, and the reverse rotation locking function may not be exhibited. If the angle exceeds 60 degrees, there may be a problem that the tip portion including the end face is easily damaged.
The angle α of the end surface 8 of the rod-shaped member 2 and the angle α ′ of the end surface 9 of the rod-shaped member 3 are preferably the same in order to stably connect the rod-shaped member 2 and the rod-shaped member 3 by surface contact. Even when the angles α and α ′ of the rod-like members 2 and 3 are different, the angle difference (α−α ′) is preferably within 5 degrees.
The diameter of the rod-shaped member 2 and the diameter of the rod-shaped member 3 may be different, but are preferably the same from the viewpoint of facilitating the work.

The cylindrical member 4 is a cylindrical member in which a through-hole 7 having a female screw that can be screwed with the male screw of the rod-shaped members 2 and 3 is formed so as to extend in the axial direction.
Inside the cylindrical member 4, the rod-like members 2 and 3 are arranged with their end faces 8 and 9 close to each other so as not to rotate relative to each other about the axis.
Here, “does not rotate relative to each other about the axis” means that when one rod-shaped member (for example, rod-shaped member 8) is fixed, the other rod-shaped member (for example, rod-shaped member 9) is also fixed. This means that it cannot rotate freely around the axis (A in FIG. 2).
In addition, “the end faces 8 and 9 are close to each other” means that the rod-shaped members 2 and 3 are in contact with each other, and a thin intermediate member (for example, a washer, a spring, etc.) is interposed between the rod-shaped members 2 and 3. It is meant to include both intervening cases.

As an example of a preferred embodiment of the joint structure of the present invention, as shown in FIG. 1, the end surfaces 8 and 9 of the rod-shaped members 2 and 3 are brought into contact with each other by surface contact without interposing an intermediate member. The thing in which the continuous external thread over 3 is formed is mentioned.
The fasteners 5 and 6 are members for fastening the tubular member 4 from both sides while being screwed to the rod-like members 2 and 3. By using the fasteners 5, 6, the rod-like members 2, 3 are pressed against each other and firmly connected, and the cylindrical member 4 rotates relative to the rod-like members 2, 3 in the axial direction. It can be prevented from moving.
Examples of the fasteners 5 and 6 include a nut, a binding tape, a crimp grip, and a pin. Another member such as a washer may be interposed between the tubular member 4 and the fasteners 5 and 6.

Next, a method for forming a joint structure will be described.
As shown in FIG. 3A, first, the fastening member 6 is screwed into the rod-shaped member 3 from below, and then the cylindrical member 4 is completely screwed from below to form the rod-shaped member 3. The end face 9 is exposed from the tubular member 4.
Thereafter, as shown in FIG. 3B, the fastener 5 is screwed onto the rod-shaped member 2, and the end surface 8 of the rod-shaped member 2 is brought close to the end surface 9 of the rod-shaped member 3 from below. To face each other.
At this time, when the rod-like members 2 and 3 can form an integrally continuous male screw, the end surface 8 is brought into contact with the end surface 9 by surface contact. When the rod-shaped members 2 and 3 do not form an integrally continuous male screw, a thin intermediate member (for example, a washer or a spring) is interposed between the rod-shaped members 2 and 3 so that the rod-shaped members 2 and 3 are inserted. And the cylindrical member 4 may be screwed together.
Next, when the cylindrical member 4 is moved downward toward the rod-shaped member 2 while keeping the end faces 8 and 9 of the rod-shaped members 2 and 3 close to each other and facing each other, the state shown in FIG. As shown, the rod-shaped member 3 is screwed from above the cylindrical member 4 to a predetermined depth of the through hole 7 and the rod-shaped member 2 is screwed from below the cylindrical member 4 to a predetermined depth of the through hole 7. It will be in the state.
Finally, when the fasteners 5 and 6 are moved toward the tubular member 4 and the tubular member 4 is fastened from both sides by the fasteners 5 and 6, as shown in FIG. The members 2 and 3 are in pressure contact with each other and the tubular member 4 is fixed, and the joint structure 1 is completed.
The rod-shaped members 2 and 3 each have an end surface formed in the same manner as the end surfaces 8 and 9 at the opposite end (not shown). Therefore, a rod-like body (for example, an anchor rod, a lock bolt, etc.) having a desired length can be produced by further connecting members similar to the rod-like members 2 and 3.

Next, an example in which the joint structure of the present invention is applied to an anchor body will be described.
FIG. 4 shows a construction work for attaching an anchor rod 14 for the purpose of stabilizing a retaining member 10 disposed as a constituent material of a retaining wall at the periphery of the underground part in civil engineering work for constructing an underground part of a building. It is a figure explaining a method.
4A shows a state in which the anchor drill 12 has penetrated into the ground 11 (a state during construction), and FIG. 4B shows the building member 10 and the ground 11 by the anchor rod 14. And shows a state of being firmly bonded (state after construction).
Here, the anchor drill 12 is inserted into the ground 11 by an anchor drill-equipped vehicle 21 shown in FIG. 5, for example. In FIG. 5, an anchor drill-equipped vehicle 21 includes a vehicle body 25, a driver's seat 26, a caterpillar 27 for traveling, a movable arm 23, and a rotational drive means that can slide in the vertical direction along the arm 23. 22 and an anchor drill 12 including a casing rod 13 and the like extending therebelow. In addition, as a kind of anchor drill 12, a hydraulic rotary percussion drill etc. are mentioned.
In FIG. 5 and FIG. 4A, the anchor drill 12 includes a cylindrical casing rod 13, an outer bit 15 that is a ground excavating blade attached to the tip of the casing rod 13, and the casing rod 13. An anchor rod (core material) 14 extending along the axis, an inner bit 16 as a ground excavating blade attached to the tip of the anchor rod 14, and an injection hose (not shown) disposed along the anchor rod 14 And a rotation drive means 22 for rotating the casing rod 13 and the anchor rod 14.

The anchor rod 14 is mainly composed of a plurality of rod-like members (for example, threaded steel rods) 2 connected by the joint structure 1 of the present invention. When the rod-shaped member 2 is added to increase the length of the anchor rod 14, the constituent members of the casing rod 13 are also added at the same time so that the anchor rod 14 and the casing rod 13 are always the same length. To.
Near the tip of the anchor rod 14, a connecting portion with the casing rod 13 is provided. The anchor rod 14 is fixed to a predetermined position in the casing rod 13 (specifically, a position along the central axis) by the connecting portion. As will be described later, the connecting portion is configured so that the anchor rod 14 and the casing rod 13 can be fixed by remote operation.
Rotation driving means 22 (see FIG. 5) for rotating the anchor rod 14 and the casing rod 13 is disposed at the end of the anchor rod 14 opposite to the ground excavation side.

The usage method of the anchor drill 12 will be described. First, after passing the anchor drill 12 through a through-hole previously drilled in the mountain retaining member (for example, H-shaped steel) 10, the anchor drill 12 is rotated and the outer bit is rotated. The ground 11 is drilled by 15 and the inner bit 16. Along with this, the tip of the anchor drill 12 gradually enters the ground 11 ((a) in FIG. 4).
After the tip of the anchor drill 12 reaches a predetermined depth, a grout material (for example, cement milk) 17 is sprayed from the vicinity of the tip of the anchor rod 14 by an injection hose attached to the anchor rod 14, and the anchor rod 14 The grout material 17 is filled in the vicinity of the tip. The grout material 17 becomes a solidified body over time and has a role as an anchor.
Next, the fixing of the connecting portion between the casing rod 13 and the anchor rod 14 is released, and only the casing rod 13 is pulled out from the ground 11 while leaving the anchor rod 14. Then, the base 18 is attached to the end of the anchor rod 14 exposed from the mountain retaining member 10 toward the space of the construction site using the fixing tool 19. Thus, as shown in FIG. 4B, an anchor structure including the anchor rod 14, the solidified grout material 17, the pedestal 18 and the like is completed.

[Example 1]
As shown in FIG. 4, an anchor drill (hydraulic rotary percussion drill) 12 is inserted into a hole of a retaining member (H-shaped steel) 10 that forms a retaining wall for retaining soil at a construction site where an underground portion of a building is created. , The anchor drill 12 is rotated, and the ground 11 is drilled by the outer bit 15 and the inner bit 16 at the tip thereof, and finally a predetermined depth (about 7.0 m) in the ground 11 The anchor drill 12 (casing rod 13 and anchor rod 14) was penetrated.
After the penetration, the anchor rod 14 uses the joint structure 1 of the present invention (see FIG. 1), and has a length of 4.0 m and a diameter of 35 mm, and a length of 1.5 m and a diameter of 35 mm. The rod was connected to a fully threaded steel rod having a length of 4.0 m and a diameter of 35 mm in this order. The angles α and α ′ (see FIG. 2) of the end faces of these three rod-shaped members were all 35 degrees. The cylindrical member 4 had a length of 18 cm and an outer diameter of 55 mm.
When the anchor rod 14 was pulled out from the ground 11 and the presence or absence of looseness of each part of the joint structure 1 was confirmed, no looseness was found at all.

It is sectional drawing which shows an example of the joint structure of this invention. It is a figure which expands and shows the end surface vicinity of the rod-shaped member in the joint structure shown in FIG. It is a flowchart which shows an example of the formation method of the joint structure shown in FIG. It is a figure for demonstrating the construction method of the anchor rod containing the joint structure of this invention. It is a figure which shows an example of the anchor drill mounting vehicle used for construction of an anchor rod. It is sectional drawing which shows an example of the conventional joint structure.

Explanation of symbols

1 Joint structure 2, 3 Bar-shaped member (threaded steel bar)
DESCRIPTION OF SYMBOLS 4 Cylindrical member 5,6 Fastening tool 7 Through-hole 8,9 Inclined end surface 10 Building member 11 Ground 12 Anchor drill 13 Casing rod 14 Anchor rod 15 Outer bit 16 Inner bit 17 Grout material 18 Base 19 Fixing tool 21 Anchor drill Mounted vehicle 22 Rotation drive means 23 Arm 24 Support part 25 Vehicle body 26 Driver's seat 27 Caterpillar 30 Joint structure 31, 32 Bar-shaped member (screw steel bar)
33 Cylindrical member 34, 35, 36, 37 Bolt 38, 39 End face 40 Through hole

Claims (6)

Joint structure comprising two rod-shaped members having male threads threaded on the outer peripheral surface and a cylindrical member having a through hole threaded with female threads on the inner peripheral surface for connecting the two rod-shaped members. Because
Each of the two rod-shaped members has an inclined end face that forms a predetermined angle with respect to a plane perpendicular to the axis;
From one side of the through hole of the tubular member, one member of the two rod-like members is screwed in by a predetermined depth, and from the other side of the through hole of the tubular member, the 2 The other member of the two rod-shaped members is screwed in a predetermined depth,
In the tubular member, the two rod-shaped members are disposed with their inclined end faces close to each other so as not to rotate relative to each other about the axis.   The joint structure according to claim 1, wherein end faces of the two rod-shaped members are in contact with each other, and a continuous male screw extending over the two rod-shaped members is formed.   The joint structure according to claim 1 or 2, wherein the cylindrical member is fastened from both sides by a pair of fasteners screwed to the two rod-like members.   The joint structure according to any one of claims 1 to 3, wherein the angle of the end face of the rod-shaped member is 10 to 60 degrees.   In order to stabilize the surface formation body of the ground, an anchor body that penetrates into the ground until one end reaches a point of an appropriate depth, and is used by fixing the other end to the surface formation body, An anchor body comprising the joint structure according to claim 1. A method for forming the joint structure according to any one of claims 1 to 4,
(A) a step of completely screwing the tubular member into one member of the two rod-shaped members and exposing an end surface of the rod-shaped member from the tubular member;
(B) a step of causing the end face of the other member of the two rod-shaped members to be close to and opposed to the exposed end face;
(C) moving the cylindrical member toward the other member of the two rod-shaped members, so that the cylindrical member is screwed across the two rod-shaped members;
(D) Forming a joint structure including a step of screwing a fastener into each of the two rod-like members, and fastening the tubular member from both sides with the pair of fasteners to complete the joint structure. Method.

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