CN115653103A

CN115653103A - Higher steel construction connecting piece of factor of safety

Info

Publication number: CN115653103A
Application number: CN202211386582.2A
Authority: CN
Inventors: 赵小兰; 陈文钦
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-01-31

Abstract

The invention discloses a steel structure connecting piece with higher safety coefficient, which relates to the technical field of steel structures and comprises a cross beam and a connecting beam, wherein the connecting beam is arranged at the top of the cross beam, and a connecting mechanism is arranged between the cross beam and the connecting beam; the connecting mechanism comprises a first L-shaped plate, a first limiting strip, a first limiting groove, a first hole, a second hole, a limiting rod, a limiting block, a third hole, a fixing rod, a fixing block, a fourth hole, a protective sleeve, a first spring and a square block.

Description

Higher steel construction connecting piece of factor of safety

Technical Field

The invention relates to the technical field of steel structures, in particular to a steel structure connecting piece with a higher safety coefficient.

Background

The steel structure building is a novel building system, has the industry boundary between the accessible house ground industry, the building industry, the metallurgical industry, assemble into a new industry system, this is that the industrial personage pizzle sees that good steel structure building system, steel structure building compares traditional concrete building, has replaced reinforced concrete with steel sheet or shaped steel, intensity is higher, the shock resistance is better, and because the component can be made by batch production, the field erection, therefore greatly reduced the time limit, because the reuse nature of steel, reduced building rubbish more green, by the wide application in industrial building and civil buildings, the application of steel structure building on high-rise, super high-rise building is mature day by day at present, become mainstream building technology gradually, be the development direction of future building.

For example, chinese patent publication No. CN113202188B discloses the following technical solutions: the utility model provides a steel construction quick connector, set up the connecting piece on the floorbar including two symmetries, the connecting piece is U shaped steel plate structure, the top of connecting piece be equipped with tie-beam assorted pressure frame, the bottom of connecting piece be equipped with floorbar pterygoid lamina assorted draw-in groove, be equipped with the sealed storehouse that two symmetries set up on the pressure frame, sliding connection has the removal angle piece in the sealed storehouse, it is isosceles right triangle structure to remove the angle piece, the right angle point that removes the angle piece has the tensioning spring with the centre gripping between sealed storehouse bulkhead, the right angle bisector of removal angle piece and the web of tie-beam, the angle bisector coincidence setting of contained angle in the pterygoid lamina.

The following problems exist in the prior art:

although the existing steel connecting structure solves the problems of long hoisting time and low assembly efficiency due to the fact that the connecting mode of the cross beam and the vertical beam is welding or bolt connection, the existing steel connecting structure is still not convenient enough through the arrangement of a plurality of pin holes and positioning holes, the assembly efficiency is improved to a limited extent, and the assembly operation is more complicated.

In view of this, we propose a steel structure connecting piece that factor of safety is higher.

Disclosure of Invention

The invention provides a steel structure connecting piece with higher safety coefficient, which aims to solve the problems in the background technology.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a steel structure connecting piece with a high safety coefficient comprises a cross beam and a connecting beam, wherein the connecting beam is arranged at the top of the cross beam, and a connecting mechanism is arranged between the cross beam and the connecting beam;

coupling mechanism includes L template one, spacing strip one, spacing groove one, hole two, gag lever post, stopper, hole three, dead lever, fixed block, hole four, protective sheath, spring one, square, spacing groove one is seted up on the tie-beam, L template one sets up the top at the crossbeam, a spacing strip fixed connection is in the outer wall left and right sides of L template one, hole one is seted up on L template one, hole two is seted up on the crossbeam, and sets up with a hole intercommunication, the bottom of gag lever post passes hole one in proper order and hole two extends to the inside of crossbeam, hole three is established on the gag lever post, the bottom of stopper and the top fixed connection of gag lever post, the top of fixed block and the inner wall top fixed connection of crossbeam, the hole quarto is established on the fixed block, the one end of dead lever passes hole four and hole three in proper order, and the outer wall of dead lever and the inner wall swing joint of hole three and hole four.

The technical scheme of the invention is further improved as follows: spacing one sets up in the inside of spacing groove one, and with a spacing groove sliding connection, the one end fixed connection of gag lever post is kept away from with the dead lever to one side outer wall of square, the spring suit is established on the dead lever, through setting up spacing groove one and spacing one for the convenience of installation L template one.

The technical scheme of the invention is further improved as follows: the one end of spring one and the one side outer wall fixed connection who is close to the protective sheath of fixed block, the other end of spring one and one side outer wall fixed connection of square, spring one sets up in the inside of protective sheath, through setting up the spring firstly in order to drive the dead lever and remove.

The technical scheme of the invention is further improved as follows: the dead lever passes protective sheath and protective sheath swing joint, protective sheath fixed connection is close to one side outer wall of spring one at the fixed block, one side outer wall of square and the one end contact of protective sheath are in order to cover spring one through setting up the protective sheath.

The technical scheme of the invention is further improved as follows: be provided with stop gear on crossbeam and the square, stop gear includes square groove one, spring two, movable block one, square groove two, spring three, movable block two, the top at the square is seted up to square groove one, spring two sets up the inside at square groove one.

The technical scheme of the invention is further improved as follows: the utility model discloses a movable block, including crossbeam, square groove two, spring two, open-ended one end fixed connection, and the one end on inclined plane is kept away from to the one end of spring two and the inner wall of square groove two, and the one end fixed connection on inclined plane is kept away from to the other end of spring two and movable block one, open-ended one end fixed connection is kept away from to the one end of spring three and the inner wall of square groove two, and the one end fixed connection on inclined plane is kept away from to the other end of spring three and movable block two, can move about for movable block one through setting up the spring two, and can also drive it and reset for movable block two through setting up the spring three, and can also drive it and reset.

The technical scheme of the invention is further improved as follows: the inclined plane of the first movable block is opposite to the inclined plane of the second movable block, the first movable block is in sliding connection with the first square groove, the second movable block is in sliding connection with the second square groove, the inclined planes are arranged on the first movable block and the second movable block for extrusion, the two movable blocks can move, one part of the movable block is arranged in the first square groove, and the two parts of the movable block are arranged in the second square groove.

The technical scheme of the invention is further improved as follows: the top of crossbeam is provided with strengthening mechanism, strengthening mechanism includes L template two, spacing groove two, spacing two, circular slot, circle piece, the circular slot is seted up on L template one, L template two sets up the inside at the tie-beam, circle piece fixed connection is on the outer wall of L template two, spacing groove two is seted up on the inner wall of tie-beam, two fixed connection of spacing are on the outer wall of L template two, and it is connected with the tie-beam for convenience of L template two to have good spacing through setting up spacing groove two.

The technical scheme of the invention is further improved as follows: the round block is inserted into the round groove, the second limiting strip is arranged inside the second limiting groove and is in sliding connection with the second limiting groove, and the round block and the round groove are arranged to facilitate connection of the second L-shaped plate and the first L-shaped plate.

The technical scheme of the invention is further improved as follows: and a fifth hole is formed in the second L-shaped plate, the limiting rod penetrates through the fifth hole to be movably connected with the fifth hole, and the fifth hole is formed to match the limiting rod and the limiting block to fix the second L-shaped plate.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the technical progress that:

1. the invention provides a steel structure connecting piece with higher safety coefficient, which is characterized in that a connecting beam is placed at a proper position on the top of a cross beam, a limiting strip is aligned to a first limiting groove, an L-shaped plate is pushed by force to align a first hole and a second hole, a square block is pulled, the square block drives a fixed rod to move for a proper distance, a limiting rod is inserted at the moment to align a third hole to the fixed rod, finally the square block is loosened, the fixed rod automatically penetrates through the third hole under the action of a first spring, so that the connection of the cross beam and the connecting beam is completed, the operation is convenient, and the assembly efficiency is higher.

2. The invention provides a steel structure connecting piece with higher safety coefficient, which is characterized in that when a cross beam and a connecting beam are installed, a square block is pulled, the square block drives a first movable block to move, so that the inclined surface of the first movable block extrudes the inclined surface of a second movable block, the movable block moves towards the inside of a second square groove, the movable block moves towards the inside of the first square groove until the first movable block is not blocked by the second movable block, the first movable block and the second movable block reset under the action of a second spring and a third spring, at the moment, the square block is loosened, the first movable block and the outer wall of the second movable block abut against each other, the springs cannot reset, and a fixed rod is fixed, so that convenience is provided for assembly, and the connecting efficiency is further improved.

3. The invention provides a steel structure connecting piece with higher safety coefficient, in the assembling process, after an L-shaped plate I is installed, a round block on an L-shaped plate II is inserted into a round groove on the L-shaped plate I, a limiting strip II is also inserted into a limiting groove II, and a limiting rod sequentially penetrates through a hole V, the hole I and the hole II, so that the L-shaped plate II is installed at the joint of a cross beam and a connecting beam, the reinforcing purpose is achieved, the safety coefficient of the steel structure connecting piece is higher, and the joint is firmer.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a cross-sectional view of the cross beam of the present invention;

FIG. 3 is an enlarged view of the present invention A;

FIG. 4 is a schematic perspective view of a coupling beam according to the present invention;

FIG. 5 is a schematic perspective view of a first L-shaped plate and a first limit strip;

FIG. 6 is a schematic perspective view of the stopper and the stopper rod of the present invention;

fig. 7 is a schematic perspective view of the second L-shaped plate and the round block of the present invention.

In the figure: 1. a cross beam; 2. a connecting beam; 3. a connecting mechanism; 301. an L-shaped plate I; 302. a first limiting strip; 303. a first limiting groove; 304. a first hole; 305. a second hole; 306. a limiting rod; 307. a limiting block; 308. a third hole; 309. a fixing rod; 310. a fixed block; 311. a fourth hole; 312. a protective sleeve; 313. a first spring; 314. a block; 4. a fifth hole; 5. a limiting mechanism; 501. a first square groove; 502. a second spring; 503. a first movable block; 504. a second square groove; 505. a third spring; 506. a second movable block; 6. a reinforcement mechanism; 601. an L-shaped plate II; 602. a second limiting groove; 603. a second limiting strip; 604. a circular groove; 605. and (7) round blocks.

Detailed Description

The present invention is further illustrated in detail below with reference to examples:

example 1

As shown in fig. 1-7, the invention provides a steel structure connecting piece with a high safety coefficient, which comprises a cross beam 1 and a connecting beam 2, wherein the connecting beam 2 is arranged at the top of the cross beam 1, and a connecting mechanism 3 is arranged between the cross beam 1 and the connecting beam 2; the connecting mechanism 3 comprises an L-shaped plate I301, a limiting strip I302, a limiting groove I303, a hole I304, a hole II 305, a limiting rod 306, a limiting block 307, a hole III 308, a fixing rod 309, a fixing block 310, a hole IV 311, a protective sleeve 312, a spring I313 and a block 314, wherein the limiting groove I303 is arranged on the connecting beam 2, the L-shaped plate I301 is arranged at the top of the beam 1, the limiting strip I302 is fixedly connected at the left side and the right side of the outer wall of the L-shaped plate I301, the hole I304 is arranged on the L-shaped plate I301, the hole II 305 is arranged on the beam 1 and is communicated with the hole I304, the bottom of the limiting rod 306 sequentially penetrates through the hole I304 and the hole II 305 to extend to the inside of the beam 1, the hole III 308 is arranged on the limiting rod 306, the bottom of the limiting block 307 is fixedly connected with the top of the limiting rod 306, the top of the fixing block 310 is fixedly connected with the top of the inner wall of the beam 1, the hole IV 311 is arranged on the fixing block 310, one end of a fixed rod 309 sequentially penetrates through a hole four 311 and a hole three 308, the outer wall of the fixed rod 309 is movably connected with the inner walls of the hole three 308 and the hole four 311, a limit strip one 302 is arranged inside a limit groove one 303 and is in sliding connection with the limit groove one 303, the outer wall of one side of a block 314 is fixedly connected with one end, far away from the limit rod 306, of the fixed rod 309, a spring one 313 is sleeved on the fixed rod 309, the L-shaped plate one 301 is conveniently installed by arranging the limit groove one 303 and the limit strip one 302, one end of the spring one 313 is fixedly connected with the outer wall of one side, close to a protective sleeve 312, of the fixed block 310, the other end of the spring one 313 is fixedly connected with the outer wall of one side of the block 314, the spring one 313 is arranged inside the protective sleeve 312, the fixed rod 309 can be driven to move by arranging the spring one 313, and the fixed rod 309 penetrates through the protective sleeve 312 to be movably connected with the protective sleeve 312, the protection cover 312 is fixedly connected to an outer wall of the fixing block 310 near the first spring 313, and an outer wall of the block 314 contacts with an end of the protection cover 312, and the protection cover 312 is disposed to cover the first spring 313.

In this embodiment, the connection beam 2 is placed at a proper position on the top of the cross beam 1, the first limit strip 302 is aligned with the first limit groove 303, the L-shaped plate 301 is pushed by force to align the first hole 304 with the second hole 305, the block 314 is pulled, the block 314 drives the fixing rod 309 to move for a proper distance, the limiting rod 306 is inserted at this time to align the third hole 308 with the fixing rod 309, finally the block 314 is loosened, and the fixing rod 309 automatically penetrates through the third hole 308 under the action of the first spring 313, so that the connection between the cross beam 1 and the connection beam 2 is completed, the operation is convenient, and the assembly efficiency is higher.

Example 2

As shown in fig. 1 to 7, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the cross beam 1 and the block 314 are provided with a limiting mechanism 5, the limiting mechanism 5 comprises a first square groove 501, a second spring 502, a first movable block 503, a second square groove 504, a third spring 505 and a second movable block 506, the first square groove 501 is arranged at the top of the block 314, the second spring 502 is arranged inside the first square groove 501, the top of the first movable block 503 and the bottom of the second movable block 506 are both provided with an inclined plane, the second square groove 504 is arranged at the top of the inner wall of the cross beam 1, the third spring 505 is arranged inside the second square groove 504, one end of the second spring 502 is fixedly connected with one end, far away from the opening, of the inner wall of the first square groove 501, the other end of the second spring 502 is fixedly connected with one end, far away from the inclined plane, of the first movable block 503, one end of the third spring 505 is fixedly connected with one end, far away from the opening, of the inner wall of the second square groove 504, the other end of the spring III 505 is fixedly connected with one end, far away from the inclined plane, of the movable block II 506, the spring II 502 is arranged so that the movable block I503 can move and can also drive the movable block II to reset, the spring III 505 is arranged so that the movable block II 506 can move and can also drive the movable block II to reset, the inclined plane of the movable block I503 is arranged opposite to the inclined plane of the movable block II 506, the movable block I503 is in sliding connection with the square groove I501, the movable block II 506 is in sliding connection with the square groove II 504, the movable block I503 and the movable block II 506 can move after being extruded by arranging the inclined planes on the movable block I503 and the movable block II 506, the movable block I503 is partially arranged inside the square groove I501, and the movable block II 506 is partially arranged inside the square groove II 504.

In this embodiment, when the beam 1 and the connecting beam 2 are installed, the block 314 is pulled, the block 314 drives the first movable block 503 to move, so that the inclined surface of the first movable block 503 extrudes the inclined surface of the second movable block 506, the second movable block 506 moves towards the inside of the second square groove 504, the first movable block 503 moves towards the inside of the first square groove 501 until the first movable block 506 does not block the first movable block 503, the first movable block 503 and the second movable block reset under the action of the second spring 502 and the third spring 505, the block 314 is released at this time, the first movable block 503 and the outer wall of the first movable block are abutted against the outer wall of the second movable block 506, and the first spring 313 cannot reset, so that the fixing rod 309 is fixed, thereby facilitating assembly and further improving connection efficiency.

Example 3

As shown in fig. 1 to 7, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the top of the cross beam 1 is provided with the reinforcing mechanism 6, the reinforcing mechanism 6 comprises a second L-shaped plate 601, a second limiting groove 602, a second limiting strip 603, a circular groove 604 and a circular block 605, the circular groove 604 is formed in the first L-shaped plate 301, the second L-shaped plate 601 is arranged inside the connecting beam 2, the circular block 605 is fixedly connected to the outer wall of the second L-shaped plate 601, the second limiting groove 602 is formed in the inner wall of the connecting beam 2, the second limiting strip 603 is fixedly connected to the outer wall of the second L-shaped plate 601, the second limiting strip 603 is arranged to facilitate connection of the second L-shaped plate 601 and the connecting beam 2 through the second limiting groove 602, a fifth hole 4 is formed in the second L-shaped plate 601, the limiting rod 306 penetrates through the fifth hole 4 to be movably connected with the fifth hole 4, the fifth hole 4 is arranged to cooperate with the limiting rod 306 and the second limiting block 307 to fix the second L-shaped plate 601, the circular block 605 is inserted into the circular groove 604, the second limiting strip 603 is arranged inside the second limiting groove 602 and is connected with the first L-shaped plate 601 through the circular block 605 and the circular groove 307.

In this embodiment, in the assembling process, after the first L-shaped plate 301 is installed, the round block 605 on the second L-shaped plate 601 is inserted into the circular groove 604 on the first L-shaped plate 301, the second limit strip 603 is also inserted into the second limit groove 602, and the limiting rod 306 sequentially penetrates through the five holes 4, the first hole 304 and the second hole 305, so that the second L-shaped plate 601 is installed at the joint of the cross beam 1 and the connecting beam 2, thereby achieving the purpose of reinforcement, so that the safety coefficient of the steel structure connecting piece is higher, and the joint is firmer.

The working principle of the steel structure connecting piece with higher safety factor is described in detail below.

As shown in fig. 1-7, in use, the connecting beam 2 is placed at a proper position on the top of the cross beam 1, the first limiting bar 302 is aligned with the first limiting groove 303, the L-shaped plate 301 is pushed by force to align the first hole 304 with the second hole 305, the block 314 is pulled, the block 314 drives the fixing rod 309 to move a proper distance, the limiting rod 306 is inserted to align the third hole 308 with the fixing rod 309, finally the block 314 is released, and the fixing rod 309 automatically passes through the third hole 308 under the action of the first spring 313, so that the connection between the cross beam 1 and the connecting beam 2 is completed, the operation is convenient, and the assembly efficiency is faster; when the beam 1 and the connecting beam 2 are installed, the block 314 is pulled, the block 314 drives the first movable block 503 to move, the inclined surface of the first movable block 503 extrudes the inclined surface of the second movable block 506, the second movable block 506 moves towards the inside of the second square groove 504, the first movable block 503 moves towards the inside of the first square groove 501 until the first movable block 503 is not blocked by the second movable block 506, the first movable block 503 and the second movable block reset under the action of the second spring 502 and the third spring 505, the block 314 is loosened, the first movable block 503 and the outer wall of the first movable block are abutted against the outer wall of the second movable block 506, and the first spring 313 cannot reset, so that the fixed rod 309 is fixed, convenience is provided for assembly, and the connecting efficiency is further improved; in the assembling process, after the first L-shaped plate 301 is installed, the round block 605 on the second L-shaped plate 601 is inserted into the round groove 604 on the first L-shaped plate 301, the second limiting strip 603 is also inserted into the second limiting groove 602, and the limiting rod 306 sequentially penetrates through the five holes 4, the first holes 304 and the second holes 305, so that the second L-shaped plate 601 is installed at the joint of the cross beam 1 and the connecting beam 2, the reinforcing purpose is achieved, the safety coefficient of the steel structure connecting piece is higher, and the joint is firmer.

The present invention has been described in general terms in the foregoing, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Therefore, modifications or improvements are within the scope of the invention without departing from the spirit of the inventive concept.

Claims

1. The utility model provides a higher steel construction connecting piece of factor of safety, includes crossbeam (1) and tie-beam (2), its characterized in that: the connecting beam (2) is arranged at the top of the cross beam (1), and a connecting mechanism (3) is arranged between the cross beam (1) and the connecting beam (2);

the connecting mechanism (3) comprises a first L-shaped plate (301), a first limiting strip (302), a first limiting groove (303), a first hole (304), a second hole (305), a first limiting rod (306), a limiting block (307), a third hole (308), a fixing rod (309), a fixing block (310), a fourth hole (311), a protective sleeve (312), a first spring (313) and a square block (314), the first limiting groove (303) is arranged on the connecting beam (2), the first L-shaped plate (301) is arranged at the top of the beam (1), the first limiting strip (302) is fixedly connected to the left side and the right side of the outer wall of the first L-shaped plate (301), the first hole (304) is arranged on the first L-shaped plate (301), the second hole (305) is arranged on the beam (1) and communicated with the first hole (304), the bottom of the limiting rod (306) sequentially penetrates through the first hole (304) and the second hole (305) to extend to the inside of the beam (1), the third hole (308) is arranged on the limiting rod (306), the bottom of the limiting rod (307) is fixedly connected with the top of the first limiting block (310), and the top of the fixing block (310) is connected with the top of the beam (310), one end of the fixing rod (309) sequentially penetrates through the hole IV (311) and the hole III (308), and the outer wall of the fixing rod (309) is movably connected with the inner walls of the hole III (308) and the hole IV (311).

2. The higher factor of safety steel structure connecting piece of claim 1, characterized in that: the limiting bar I (302) is arranged inside the limiting groove I (303) and is in sliding connection with the limiting groove I (303), the outer wall of one side of the square block (314) is fixedly connected with one end, far away from the limiting rod (306), of the fixing rod (309), and the spring I (313) is sleeved on the fixing rod (309).

3. The higher factor of safety steel structure connecting piece of claim 2, characterized in that: one end of the first spring (313) is fixedly connected with the outer wall of one side, close to the protective sleeve (312), of the fixing block (310), the other end of the first spring (313) is fixedly connected with the outer wall of one side of the block (314), and the first spring (313) is arranged inside the protective sleeve (312).

4. The higher factor of safety steel structural connection of claim 3, characterized in that: the fixing rod (309) penetrates through a protective sleeve (312) and is movably connected with the protective sleeve (312), the protective sleeve (312) is fixedly connected to the outer wall of one side, close to the first spring (313), of the fixing block (310), and the outer wall of one side of the square block (314) is in contact with one end of the protective sleeve (312).

5. The higher factor of safety steel structural connection of claim 1, characterized in that: be provided with stop gear (5) on crossbeam (1) and square (314), stop gear (5) are including square groove one (501), spring two (502), movable block one (503), square groove two (504), spring three (505), movable block two (506), the top at square (314) is seted up in square groove one (501), spring two (502) set up the inside at square groove one (501).

6. The higher factor of safety steel structural connection of claim 5, characterized in that: the top of movable block one (503) and the bottom of movable block two (506) all are provided with the inclined plane, the inner wall top at crossbeam (1) is seted up in square groove two (504), spring three (505) set up the inside at square groove two (504), open-ended one end fixed connection is kept away from to the one end of spring two (502) and the inner wall of square groove one (501), and the one end fixed connection on inclined plane is kept away from to the other end of spring two (502) and movable block one (503), open-ended one end fixed connection is kept away from to the one end of spring three (505) and the inner wall of square groove two (504), and the one end fixed connection on inclined plane is kept away from to the other end of spring three (505) and movable block two (506).

7. The higher factor of safety steel structural connection of claim 6, characterized in that: the inclined plane of the first movable block (503) is opposite to the inclined plane of the second movable block (506), the first movable block (503) is in sliding connection with the first square groove (501), and the second movable block (506) is in sliding connection with the second square groove (504).

8. The higher factor of safety steel structure connecting piece of claim 1, characterized in that: the top of crossbeam (1) is provided with strengthening mechanism (6), strengthening mechanism (6) include L template two (601), spacing groove two (602), spacing strip two (603), circular slot (604), circle piece (605), set up on L template one (301), L template two (601) set up the inside at tie-beam (2), circle piece (605) fixed connection is on the outer wall of L template two (601), set up on the inner wall of tie-beam (2) spacing groove two (602), spacing strip two (603) fixed connection is on the outer wall of L template two (601).

9. The higher factor of safety steel structural connection of claim 8, characterized in that: the round block (605) is inserted into the round groove (604), and the second limiting strip (603) is arranged inside the second limiting groove (602) and is in sliding connection with the second limiting groove (602).

10. The higher factor of safety steel structural connection of claim 8, characterized in that: and a fifth hole (4) is formed in the second L-shaped plate (601), and the limiting rod (306) penetrates through the fifth hole (4) to be movably connected with the fifth hole (4).