Wall jack

Abstract

To provide a wall jack which does not get in the way in a work passage of a scaffold and is excellent in workability and safety. [Solution] A compression member to be placed between the exterior wall W of a building and the scaffolding around it, comprising a holder part 6 having a hollow holder body, a jack part 2, and a falling-off prevention mechanism, the jack part 2 comprising an axial member 3 inserted into the holder body, a movable part 4 movable along the axial direction of the axial member 3, and a contact part 5 connected to the tip of the axial member 3, the falling-off prevention mechanism comprising a flange provided inward from the inner wall surface of one end opening of the holder body, and a locking projection provided protruding outward from the base end of the axial member capable of locking with the flange. Therefore, the falling-off prevention mechanism prevents the holder part 6 and the jack part 2 from separating, improving safety for workers and ease of handling and workability.

Description

[Technical field]

[0001] The present invention relates to a wall jack, and more particularly to a wall jack that is used between a building and a scaffold at a construction site or the like. [Background technology]

[0002] Temporary scaffolding at construction sites is assembled in layers by combining multiple steel pipes, work floors (fabric frames), and other scaffolding components along the exterior walls of the building. Generally, multiple jack bases are installed at the bottom, steel pipes are inserted into these jack bases to form the foundation pillars, and multiple stories of scaffolding are assembled using these pillars as the foundations. Furthermore, in order to ensure the safety of workers, various measures are required for multi-story scaffolding under occupational safety and health regulations and guidelines. For example, for frame scaffolding, it is mandatory to provide cross braces, underpinnings, baseboards, wall ties, etc., to keep the distance between the upper and lower work floors at around 1800 mm, to keep the distance between the scaffolding and the building wall at around 300 mm, and to provide wall support (compression material, so-called wall support jack) instead of wall ties when it is difficult to install wall ties due to the structure of the building, etc.

[0003] Various types of wall jacks have been proposed in the past (Patent Documents 1 to 3). Conventional wall jacks have roughly the same basic structure, and are configured to include a hollow fixing part for fixing to a steel pipe that will be the base of the scaffolding, and a shaft-shaped shaft member with a base end inserted into the fixing part. The shaft member has a screw thread formed on its outer circumferential surface, and an abutment part is provided at its tip for contacting the wall of the building, and a distance adjustment member is provided on the outer circumferential surface of the shaft member that is rotatably movable along the axial direction of the shaft member while being screwed onto the outer circumferential surface of the shaft member. When attaching this wall jack to a steel pipe on the scaffolding site, the fixed part is first fastened to the steel pipe with a clamp or the like. At this time, in order to secure a working space and a space for fixing, the fixed part is fixed at a position located about 200 mm below the bottom surface of the work floor. Next, the abutment part at the tip of the shaft member is brought into contact with the wall of the building, and the distance adjustment member is rotated to abut against the fixed part, thereby preventing the scaffolding from falling inward or swaying. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2017-48659 [Patent Document 2] Patent Publication No. 2014-91989 [Patent Document 3] Utility Model Application Publication No. 5-035958 Summary of the Invention [Problem to be solved by the invention]

[0005] In conventional wall jacks, a jack base with a shaft length of 400 to 600 mm is usually used as the shaft member. When a wall jack using such a shaft member is used on a scaffold with a general configuration (a scaffold with a distance between the upper and lower work floors of about 1800 mm and a distance between the scaffold and the building wall of about 300 mm), the base end of the shaft member protrudes about 100 to 300 mm at a height of about 1600 mm from the top surface of the work floor. In other words, the shaft member of the wall jack is positioned at a height where a person's head would be located in the work passage. For this reason, there are many incidents where workers hit their heads even if they are wearing helmets. Even if one were to think of cutting off part of the shaft member that protrudes into the work passage, the shaft member would become shorter, and there would be a possibility of accidents occurring, such as the shaft member coming off the fixed part when attaching it to the scaffolding or the shaft member falling during attachment. Therefore, from the standpoints of workability and safety, wall jacks that are designed to have a shaft member length that is the same as or shorter than the distance between the scaffolding and the exterior wall of the building are currently not in use.

[0006] In view of the above circumstances, the present invention aims to provide a wall jack that does not get in the way in work passages on scaffolding and is easy to use and safe. [Means for solving the problem]

[0007] The wall jack of the first invention is a compression member arranged between the exterior wall of a building and scaffolding erected around the building, and comprises a holder part having a hollow holder body with an opening at one end, a jack part, and an anti-fall-off mechanism. The jack part comprises a shaft-shaped shaft member with a screw thread formed on its outer peripheral surface which is inserted from the opening at one end of the holder body toward the other end, a movable part which is rotatably movable along the axial direction of the shaft member while screwing onto the outer peripheral surface of the shaft member, and an abutment part which is connected to the tip of the shaft member and is for abutting against the exterior wall of the building. The anti-fall-off mechanism comprises a flange provided inward from the inner wall surface of the opening at one end of the holder body, which has an opening, and a locking protrusion provided protruding outward from the base end of the shaft-shaped member which can engage with the flange. The wall jack of the second invention is characterized in that, in the first invention, the flange is formed so that the length from the base end to the tip is such that a gap is provided between the tip of the flange and the outer surface of the shaft member, and the length from the base end to the tip of the locking projection is longer than the gap between the tip of the flange and the outer surface of the shaft member, and the tip of the locking projection is formed so that it does not contact the inner wall surface of the holder body. The wall jack of the third invention is characterized in that, in the first or second invention, the flange is formed in an endless ring shape. The wall jack of the fourth invention is characterized in that, in the first or second invention, the jack part is formed so that the length from the bottom surface of the abutment part to the base end of the shaft member is 90 mm or more and is not more than the distance from the scaffolding to the outer wall of the building plus 50 mm to the outer diameter of the steel pipe of the scaffolding. The wall jack of the fifth invention is characterized in that, in the first or second invention, the length from one end to the other end of the holder body of the holder part is calculated by subtracting the length of the shaft member inserted into the holder body from the length of the jack part from the sum of the outer diameter of the scaffolding steel pipe and the distance from the scaffolding to the exterior wall of the building. Effect of the Invention

[0008] According to the present invention, since the jack part and the holder part are connected by the fall-off prevention mechanism, the length of the jack part can be made shorter than the length of the jack part of a conventional wall jack. Moreover, since the jack part can be made shorter, the workability and safety when attaching it to the scaffolding can be improved. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic explanatory diagram of a wall jack 1 of this embodiment disposed between a scaffold and an exterior wall W of a building. [Diagram 2] FIG. 1 is a schematic explanatory diagram of a wall jack 1 according to the present embodiment. [Diagram 3] FIG. 2 is a schematic explanatory diagram of the wall jack 1 of the present embodiment in an extended state. [Figure 4] 1 is a schematic explanatory diagram of a state in which a locking protrusion 10a and a flange 10b that constitute a falling-off prevention mechanism 10 of the wall jack 1 of the present embodiment are locked together. FIG. [Diagram 5] 1 is a schematic explanatory diagram of a locking protrusion 10a and a flange 10b that constitute a falling-off prevention mechanism 10 of the wall jack 1 of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Next, an embodiment of the present invention will be described with reference to the drawings. The wall jack 1 of this embodiment is a compression member (wall jack) that is arranged between the exterior wall W of a building and scaffolding erected around the building, and is characterized by being able to improve safety when a worker moves across the work floor (also called a work platform), and also being able to improve ease of handling and the work floor.

[0011] 1 to 3, a wall jack 1 of this embodiment (hereinafter simply referred to as this wall jack 1) includes a jack section 2, a holder section 6 that supports the jack section 2, and an anti-fall-off mechanism 10. The holder section 6 includes a hollow holder body 6a having an opening at one end, and the jack section 2 includes a shaft-shaped shaft member 3, a movable section 4, and a contact section 5.

[0012] (Jack part 2) First, the jack portion 2 of the wall striking jack 1 will be described.

[0013] (shaft member 3) The shaft member 3 of the jack section 2 is a metal shaft-shaped member having a screw thread formed on its outer circumferential surface. This shaft member 3 is generally a member simply called a jack. As shown in Figures 1 to 3, the abutment part 5 is connected to the tip of the shaft member 3, and the base end of the shaft member 3 is inserted into the holder body 6a of the holder part 6. As shown in Figure 4, the base end of the shaft member 3 inserted into the holder body 6a is provided with a locking projection 10a that protrudes outward. This locking projection 10a constitutes an anti-falling mechanism 10 of the wall jack 1, which will be described later. In the figures, the abutment part 5 side of the shaft member 3 is the tip, and the opposite side is the base end, and the shaft member 3 is provided so that the base end is inserted into the holder body 6a.

[0014] As shown in Figures 2 to 5, this locking projection 10a is provided at the base end of the shaft member 3, and is formed so that its tip does not come into contact with the inner wall surface of the holder portion 6 (see Figure 4). In other words, the shaft member 3 is formed so that the locking projection 10a does not come into contact with the inner wall surface of the holder main body 6a, and therefore can move freely along the axial direction. Details of this locking projection 10a will be described later.

[0015] The shaft member 3 is formed to have a length that does not get in the way of workers moving along the work passage WP when the wall jack 1 is placed on a scaffold and used as described later. The work passage WP shown in FIG. 1 refers to a space located above a work floor (not shown) through which workers can move and work.

[0016] The length of this shaft member 3 from its base end to its tip is calculated based on the distance L1 from the scaffolding to the exterior wall W of the building and the outer diameter L5 of the steel pipe P (generally referring to a pipe used in scaffolding) of the scaffolding to which the wall jack 1 is attached, as described below. For example, the length of the shaft member 3 can be formed to be 90 mm or more and 350 mm or less. For example, when the distance between the pipe P located on the outer wall side of the scaffolding building and the outer wall surface is about 300 mm, the length is formed to be about 200 mm to 250 mm.

[0017] (Movable part 4) As shown in FIGS. 1 to 4, the shaft member 3 is provided with a movable portion 4 so as to be screwed into a thread formed on the outer circumferential surface of the shaft member 3. The movable part 4 is equipped with a cylindrical movable body 4a having a through hole therein. A screw thread is formed on the inner peripheral surface of the movable body 4a. In other words, the movable body 4a is a nut-shaped member. The movable body 4a can be attached to the shaft member 3 by screwing together the screw threads when the shaft member 3 is inserted into the through hole that penetrates the interior of the movable body 4a and rotated.

[0018] 1 to 4, the movable part 4 is provided with a pair of rod-shaped handles 4b protruding outward to facilitate rotation of the movable main body 4a. The movable part 4 attached to the shaft member 3 is attached so that it can move rotatably along the axial direction of the shaft member 3 while screwing onto the outer circumferential surface of the shaft member 3 by rotating the handles 4b. In other words, by rotating the handles 4b, the meshing position between the thread formed on the inner circumferential surface of the movable main body 4a of the movable part 4 and the thread formed on the outer circumferential surface of the shaft member 3 is changed, so that it can be moved along the axial direction of the shaft member 3.

[0019] As shown in Figs. 1 to 4, the movable body 4a is moved toward the base end along the axial direction of the shaft member 3 until one end (the end edge in the axial direction of the shaft member 3 when the movable part 4 is attached to the shaft member 3) abuts against one end of the holder body 6a. The holder body 6a is fixed in a state in which one end of the holder body 6a abuts against one end of the movable body 4a, and the movable body 4a is further moved toward the base end along the axial direction of the shaft member 3. Then, the shaft member 3 can be extended toward the tip end along the axial direction. Therefore, when the wall-contacting jack 1 is attached to the scaffolding, the movable part 4 can move the contact member toward or away from the outer wall W of the building by rotating the handle 4b connected to the movable body 4a. In other words, the length of the wall-contacting jack 1 can be adjusted by the movable part 4.

[0020] The height of the movable body 4a of the movable part 4 (the length in the axial direction of the shaft member 3 when the movable part 4 is attached to the shaft member 3, and the distance between one end and the other end of the movable body 4a) can be set to a length similar to that used in general scaffolding jacks. For example, the height of the movable body 4a is formed to be about 20 mm to 50 mm.

[0021] (Abutting part 5) 1 to 3, an abutment portion 5 formed so that its bottom surface abuts against an exterior wall W of a building is connected to the tip of the shaft member 3. The abutment portion 5 is a member generally simply called a slat. The abutment portion 5 is a member that abuts against the exterior wall W of the building, and is formed in a shape that can distribute the load acting from the scaffolding toward the wall surface when the wall abutment jack 1 is arranged between the scaffolding and the exterior wall W of the building. The contact portion 5 includes a plate-shaped contact member 5b that contacts the exterior wall W of the building, and a connecting member 5a that connects the contact member 5b to the tip of the shaft member 3. The connecting member 5a may be disk-shaped, bowl-shaped, or dome-shaped, but may be the same as that used for the contact portion 5 in a general wall jack. The contact surface of the contact member 5b that comes into contact with the exterior wall W of the building is formed of a material that does not damage the surface of the exterior wall W of the building. For example, the contact surface of the contact member 5b is formed of a flexible, cushioning resin material, rubber, cloth, or other buffer material.

[0022] The thickness of the contact portion 5 (the length from the bottom surface of the contact member 5b to the tip of the connecting member 5a (the part connected to the shaft member 3)) can be approximately the same length as that used in general scaffolding jacks. For example, the thickness of the contact portion 5 is formed to be about 10 mm to 40 mm.

[0023] (Length of jack part 2 L2) As shown in Figure 3, the jack portion 2 as described above has a length L2 (hereinafter referred to as the length L2 of the jack portion 2) from the contact surface that can come into contact with the outer wall W of the abutment portion 5 to the base end of the shaft member 3, which is at its longest, so as not to interfere with a work vehicle moving through the work aisle WP (i.e., the space above the work floor) when this wall jack 1 is attached to a scaffold and used. Specifically, the length L2 of the jack section 2 is calculated based on the distance L1 from the scaffolding to the exterior wall W of the building (e.g., the distance stipulated in the Industrial Safety and Health Act or the distance stipulated in the guidelines for scaffolding-first construction methods) and the outer diameter L5 of the steel pipe P of the scaffolding to which the wall jack 1 is attached (e.g., the size stipulated in the JIS standard (JIS G 3444)). This value is formed, for example, so that the portion protruding into the work passage WP from approximately the sum of both (the distance L1 from the scaffolding to the exterior wall W of the building and the outer diameter L5 of the steel pipe P) is 50 mm or less. In other words, the length L2 of the jack section 2 is formed to be equal to or less than the value obtained by adding 50 mm to the distance L1 from the scaffolding to the exterior wall W of the building and the outer diameter L5 of the steel pipe P.

[0024] For example, the length L2 of the jack section 2 is set to 400 mm or less when the outer diameter L5 of the steel pipe P of the scaffolding to which the wall jack 1 is attached is 50 mm (similar to JIS G 3444) and the distance L1 between the scaffolding and the exterior wall W of the building is 300 mm (Guidelines for Scaffolding-First Construction Method, revised February 10, 2006). In particular, if the length L2 of the jack section 2 is set to 350 mm or less, the base end of the shaft member 3 of the jack section 2 can be set to be approximately flush with the steel pipe P of the scaffolding to which the wall jack 1 is attached or positioned closer to the exterior wall W of the building (see Figure 1).

[0025] Incidentally, the above-mentioned "flush with the steel pipe P" refers to the surface of the steel pipe P located on the work passage WP side (hereinafter referred to as the steel pipe surface), and refers to the surface including the intersection point where a perpendicular line drawn from the exterior wall W of the building to the steel pipe P intersects with the outer surface of the steel pipe P on the work passage WP side, and this steel pipe surface is formed so as to be approximately parallel to the edge in the longitudinal direction of the work floor that forms the work passage WP. For example, when the outer surface of the steel pipe P is in contact with the edge of the work floor, one surface on the building side of the space that forms the work passage WP is formed by the steel pipe surface. Therefore, if the base end of the shaft member 3 of the jack section 2 is formed so that it is approximately flush with the steel pipe P of the scaffolding on which the wall striking jack 1 is attached or is positioned closer to the outer wall W of the building, the base end of the shaft member 3 is formed so as not to be located within the work passage WP.

[0026] In addition, the length L2 of the jack portion 2 is formed so that its shortest length is the sum of the length L3 (insertion length) of the base end of the shaft member 3 inserted into the holder main body 6a, the axial height of the shaft member 3 of the movable main body 4a of the movable portion 4, and the thickness of the abutment portion 5. For example, if the insertion length L3 is 30 mm, the height of the movable body 4a of the movable part 4 is 30 mm, the thickness of the abutment part 5 is 30 mm, and the movable space of the movable part 4 is 30 mm, the length L2 of the jack part 2 is 120 mm. Note that the length of the shaft member 3 at this time is 90 mm, which is equal to the total value of the insertion length L3, the height of the movable body 4a of the movable part 4, and the movable space of the movable part 4.

[0027] The insertion length L3 of the shaft member 3 is adjusted based on the strength of the shaft member 3 and the holder main body 6a, the distance between the scaffolding and the outer wall W of the building, etc. For example, the insertion length L3 is 20 mm or more, preferably 30 mm or more, and more preferably 50 mm or more.

[0028] Here, the length L3 of the shaft member 3 inserted into the holder body 6a refers to the length of the base end of the shaft member 3 inserted into the holder body 6a when the wall jack 1 is arranged between the scaffolding and the exterior wall W of the building. The state in which the wall contact jack 1 is disposed between the scaffolding and the exterior wall W of the building means that the holder body 6a of the wall contact jack 1 is fastened to a predetermined steel pipe P of the scaffolding with a clamp, and the contact part 5 of the jack part 2 is pressed against the exterior wall W of the building, so that the wall contact jack 1 is disposed between the scaffolding and the exterior wall W of the building. In this specification, the state in which the wall contact jack is disposed between the scaffolding and the exterior wall W of the building is meant as described above.

[0029] (Holder part 6) Next, the holder portion 6 of the wall jack 1 will be described.

[0030] 1 to 4, the holder body 6a of the holder part 6 is a hollow member having an accommodation space for accommodating therein the shaft member 3 of the jack part 2. Specifically, the holder body 6a is a hollow member having an opening at one end, and the base end of the shaft member 3 of the jack part 2 can be inserted inside through this opening. As long as the holder body 6a has an opening at one end through which the shaft member 3 can be inserted, the other end may be closed, or the holder body 6a may have a structure having an opening similar to that at the one end (for example, a pipe-like structure having openings at both ends). For example, when a pipe such as a steel pipe P is used for the holder body 6a, a pipe having an inner diameter slightly larger than the outer diameter of the shaft member 3 of the jack part 2 is used. This allows the shaft member 3 to move smoothly inside the holder body 6a of the holder part 6.

[0031] 3, the holder part 6 may be provided with a cover member 6b so as to cover the other end of the holder main body 6a. This cover member 6b can be made of a flexible resin material, rubber, or the like. By covering the other end of the holder part 6 with this cover member 6b, the worker can be protected even if he or she accidentally bumps into something. Furthermore, if the surface of the cover member 6b is colored in a warning color, it will be easier for the worker to pay attention to it, and safety can be improved. The warning color can be, for example, yellow, but is not particularly limited as long as it is a color that easily draws the worker's attention, and red, green, blue, fluorescent colors, etc. may be used.

[0032] (Length of holder part 6 L4) As shown in FIG. 3, the holder portion 6 is formed so that the axial length of the holder main body 6a, i.e., the length L4 from one end (the end face having an opening for inserting the base end of the shaft member 3) to the other end (hereinafter simply referred to as the length L4 of the holder portion 6), is a predetermined length. Specifically, the length L4 of the holder part 6 has an axial width sufficient to attach the clamp CP, and is calculated based on the distance L1 between the scaffolding and the exterior wall W of the building (for example, a distance specified in the Industrial Safety and Health Act as mentioned above), the length L2 of the jack part 2, the insertion length L3 of the shaft member 3 inserted into the holder body 6a, and the outer diameter L5 of the steel pipe P of the scaffolding to which the wall jack 1 is attached (for example, a size specified in the JIS standard as mentioned above). In other words, the length L4 of the holder part 6 is calculated by subtracting the value of (length L2 of the jack part 2 - insertion length L3 of the shaft member 3) from the value of (outer diameter L5 of the steel pipe P of the scaffolding on which the wall jack 1 is attached + distance L1 between the scaffolding and the outer wall W of the building).

[0033] For example, if the outer diameter L5 of the steel pipe P is 50 mm, the distance L1 between the scaffolding and the exterior wall W of the building is 300 mm, the length L2 of the jack section 2 is 250 mm, and the insertion length L3 of the shaft member 3 is 50 mm, the length L4 of the holder section 6 is (50 mm + 300 mm) - (250 mm - 50 mm) = 150 mm. In this case, as shown in Figure 2, when the length of the wall hitting jack 1 is in the shortest state (shortest state), the base end of the shaft member 3 of the jack section 2 is formed to protrude from the other end face of the holder body 6a of the holder section 6. Also, for example, if the length L2 of the jack part 2 is 200 mm, the insertion length L3 of the shaft member 3 is 70 mm, and the distance between the steel pipe P, the scaffolding, and the exterior wall W of the building is the same as above, the length L4 of the holder part 6 is formed to be (50 mm + 300 mm) - (200 mm - 70 mm) = 220 mm.

[0034] 2, it is preferable to form the base end of the shaft member 3 so that it protrudes from the other end face of the holder main body 6a in the shortest state, since this makes it easier to attach the locking projection 10a of the fall-off prevention mechanism 10 to the base end of the shaft member 3. Specifically, the shaft member 3 is inserted with the flange 10b of the fall-off prevention mechanism 10 provided at one end of the holder main body 6a, and the locking projection 10a is provided at the base end of the shaft member 3 protruding from the other end face of the holder main body 6a. Alternatively, the shaft member 3 may be inserted into the holder main body 6a with the locking projection 10a provided at the base end of the shaft member 3 first, and then the flange 10b may be provided at one end of the holder main body 6a.

[0035] (Falling prevention mechanism 10) As shown in Fig. 4, a flange 10b is provided on the inner wall surface of one end opening (the end having an opening at one end) of the holder main body 6a. This flange 10b is formed so as to protrude inward from the inner wall surface of one end of the holder main body 6a. Specifically, this flange 10b is formed so that when the shaft member 3 is inserted into the holder main body 6a, the tip does not come into contact with the outer surface of the shaft member 3. Specifically, when the shaft member 3 and the holder main body 6a are arranged so that their central axes CL coincide with each other, the tip of the flange 10b does not come into contact with the shaft member 3.

[0036] 4, this flange 10b is formed so as to come into contact with a locking projection 10a provided at the base end of the shaft member 3 to lock the holder body 6a and the shaft member 3 when the base end of the shaft member 3 is moved near the opening at one end of the holder body 6a. Specifically, in this state, the flange 10b and the locking projection 10a can prevent the shaft member 3 from coming off the holder body 6a of the holder part 6. In other words, the flange 10b and the locking projection 10a constitute the fall-off prevention mechanism 10 of the wall hitting jack 1. In other words, in the wall hitting jack 1, the jack part 2 and the holder part 6 are connected by the fall-off prevention mechanism 10.

[0037] 4, the flange 10b is formed so that a gap W2 is provided between the tip and the outer surface of the shaft member 3 (a surface passing through the tip surface of the thread of the shaft member 3) when the holder body 6a and the shaft member 3 are arranged so that the central axis CL of the shaft member 3 and the central axis CL of the holder body 6a coincide with each other. This gap W2 is formed so as to be shorter than the length W1 from the base end (the portion where the locking projection 10a is connected to the shaft member 3) of the locking projection 10a of the shaft member 3 described above to the tip. In other words, the length W1 from the base end to the tip of the locking projection 10a is longer than the gap W2 between the tip of the flange 10b and the outer surface of the shaft member 3, and the tip of the locking projection 10a is formed so as not to contact the inner wall surface of the holder main body 6a.

[0038] The shapes of the flange 10b and the locking protrusion 10a of the anti-fall-off mechanism 10 are not particularly limited as long as they are capable of locking with each other when the base end of the shaft member 3 is moved to one end of the holder main body 6a of the holder portion 6 as described above.

[0039] The left figure in Figure 5 is a diagram showing an example of a holder main body 6a when the holder main body 6a and the axial member 3 are separated, as viewed from the other end toward one end, and the right figure in Figure 5 is a diagram showing an example of a holder main body 6a when the holder main body 6a and the axial member 3 are separated, as viewed from the base end toward the tip end.

[0040] As shown in the left diagram of Figure 5, the flange 10b may be formed in a continuous ring shape (i.e., an endless ring shape) (left diagram (A) of Figure 5), or may be composed of multiple flanges 10b so as to form a discontinuous ring shape (left diagrams (B) and (C) of Figure 5), or may be composed of only a single flange 10b (left diagrams (D) and (E) of Figure 5).

[0041] For example, as shown in the left diagram (A) of FIG. 5, the flange 10b can be formed by connecting an endless ring-shaped member to the inside of the holder body 6a of the holder portion 6 by welding or the like. Also, as shown in the left diagrams (B) and (C) of FIG. 5, the flanges 10b can be formed so that a gap is formed between adjacent flanges 10b. By making this gap equal to, shorter than, or longer than the width of the flanges 10b in a plan view (the length in the inner circumferential direction substantially perpendicular to the radial direction of the holder body 6a), flanges 10b of various shapes can be formed. For example, as shown in the left diagrams (B) and (C) of FIG. 5, a plurality of flanges 10b may be arranged at equal angular intervals from the central axis of the holder body 6a in the inner circumferential direction of the holder body 6a. Also, a plurality of flanges 10b may be arranged so as to be rotationally symmetric in the inner circumferential direction of the holder body 6a with respect to the central axis of the holder body 6a, or, for example, a plurality of flanges 10b may be arranged randomly along the inner circumferential direction of the holder body 6a.

[0042] The flange 10b may be formed by connecting a member having the above-mentioned shape to the inner wall surface of the holder main body 6a by welding or the like, or by connecting bead-shaped metal particles generated by welding or the like to the inner wall surface of the holder main body 6a.

[0043] The locking projections 10a are appropriately adjusted in shape so as to be capable of locking with each other in accordance with the shape of the flanges 10b described above. For example, as shown in the right diagram of Figure 5, the locking protrusion 10a may be formed in an endless ring shape (right diagram (A) of Figure 5), or may be formed as a discontinuous ring shape consisting of multiple locking protrusions 10a (right diagrams (B) and (C) of Figure 5), or as a single locking protrusion consisting of only 10a (right diagrams (D) and (E) of Figure 5).

[0044] When the flange 10b is an endless ring, the locking projection 10a may be an endless ring, a discontinuous ring, or a single member, as shown in the right diagrams (A) to (E) of Fig. 5. In particular, it is preferable that either the flange 10b or the locking projection 10a is formed into an endless ring, since this allows the two to be more appropriately locked together. Conversely, when the locking projection 10a is an endless ring, the flange 10b may be an endless ring, a discontinuous ring, or a single member, as shown in the left diagrams (A) to (E) of Fig. 5.

[0045] For example, as shown in the right diagram (A) of FIG. 5, the locking projection 10a can be formed by connecting an endless ring-shaped member to the outer surface of the shaft member 3 by welding or the like. When the locking projections 10a are formed in a discontinuous ring shape, as shown in the right diagrams (B) and (C) of FIG. 5, a gap can be formed between adjacent locking projections 10a. The gap can be made equal to, shorter than, or longer than the width of the locking projections 10a in a plan view (the length in the circumferential direction substantially perpendicular to the radial direction of the shaft member 3). This allows the locking projections 10a to be formed in various shapes. For example, as shown in the right diagrams (B) and (C) of FIG. 5, a plurality of locking projections 10a may be arranged at equal angular intervals from the central axis of the shaft member 3 in the circumferential direction of the shaft member 3. In addition, a plurality of locking projections 10a may be arranged so as to be rotationally symmetrical in the circumferential direction of the shaft member 3 with respect to the central axis of the shaft member 3, or, for example, a plurality of locking projections 10a may be arranged randomly along the circumferential direction of the shaft member 3.

[0046] In addition, the locking protrusion 10a may be formed by connecting a member of the above shape to the outer surface of the shaft member 3 by welding or the like, or by connecting bead-shaped metal particles created by welding or the like from the outer surface of the shaft member 3 outward.

[0047] When the locking projection 10a and the flange 10b have a shape other than an endless ring shape, the locking projection 10a can be locked to each other by adjusting them as follows. That is, when the fall-off prevention mechanism 10 has a discontinuous ring-shaped flange 10b and a discontinuous ring-shaped locking projection 10a as described above, the following adjustment is made.

[0048] For example, the locking protrusion 10a is formed so that its width in a plan view is longer than the gap between the flanges 10b (relationship between the locking protrusion 10a in the right diagram (B) or (D) of Figure 5 and the flange 10b in the left diagram (B) of Figure 5). In addition, the locking protrusions 10a are formed so that the gap between adjacent locking protrusions 10a is shorter than the width of the flange 10b in a planar view (relationship between the locking protrusions 10a in the right diagram (B) of Figure 5 and the flanges 10b in the left diagrams (B) to (E) of Figure 5).

[0049] As shown in Fig. 1, when the wall jack 1 is attached to a scaffolding, the holder body 6a of the holder part 6 is fastened to a steel pipe P on the building located at a predetermined part of the scaffolding using a clamp CP. A known clamp metal fitting can be used for this clamp CP, and it is connected and fixed to the above-mentioned steel pipe P via a fixing bracket on the outer circumferential surface of the holder body 6a.

[0050] (Method of installing the wall jack of this embodiment) Next, a method for attaching the wall jack 1 to a scaffolding will be described.

[0051] In this wall jack 1, the holder part 6 and the jack part 2 are connected by an anti-fall mechanism 10, so that the base end of the shaft member 3 is inserted into the holder body 6a. Therefore, when the holder body 6a of the holder part 6 is fastened to a predetermined steel pipe P of the scaffolding using a clamp, the jack part 2 can be supported by the holder part 6 if the tip of the shaft member 3 of the jack part 2 faces the outer wall W of the building and the other end of the holder body 6a is fastened so as not to protrude into the work passage WP.

[0052] In this state, the handle 4b of the movable part 4 is operated to rotate the movable body 4a around the shaft member 3, and the movable part 4 is moved toward the base end side of the shaft member 3. Then, the movable body 4a is moved until it abuts against one end of the holder body 6a. In other words, the movable body 4a moves relative to the shaft member 3 while being locked by one end face of the holder body 6a. At this time, since the holder body 6a is fixed to the scaffolding, the tip of the shaft member 3 moves away from the holder body 6a along the axial direction. As a result, the abutment part 5 connected to the tip of the shaft member 3 of the jack part 2 moves closer to the exterior wall W of the building. Then, by rotating the movable part 4 to a position where the contact member 5b of the abutment part 5 abuts against the exterior wall W, the wall abutment jack 1 can be disposed between the scaffolding and the exterior wall W of the building so as to press against the exterior wall W via the abutment part 5 (see FIG. 1).

[0053] (summary) Since the wall jack 1 is configured as described above, by using one with a length that corresponds to the distance between the scaffolding on site and the exterior wall W of the building, the wall jack 1 can be prevented from protruding into the work passage WP. Specifically, as shown in Figs. 1 and 3, the length L2 of the jack section 2 of the wall jack 1 (the length from the bottom surface of the contact member 5b of the abutment section 5 to the base end of the shaft member 3 when the jack section 2 is placed as shown in Fig. 1) is formed to be a length calculated based on the distance L1 from the scaffold to the exterior wall W of the building (for example, the distance specified in the above-mentioned Industrial Safety and Health Act) and the outer diameter L5 of the steel pipe P of the scaffold (for example, the size specified in the above-mentioned JIS standard). For example, this length L2 is formed to be equal to or slightly longer than the sum of both. Also, the length L4 of the holder body 6a of the holder section 6 of the wall jack 1 is formed to be a length calculated by subtracting the insertion length of the shaft member 3 from the length of the shaft member 3 of the jack section 2 from the sum of the outer diameter L5 of the steel pipe P and the distance L1 between the scaffold and the exterior wall W of the building.

[0054] As shown in Figure 1, when disposing the wall jack 1 between the scaffolding and the exterior wall W of a building, the other end of the holder body 6a of the holder part 6 and the steel pipe P to which the wall jack 1 is attached are positioned so that they are approximately flush, the holder body 6a is fastened to a specified steel pipe P of the scaffolding with a clamp, and the jack part 2 is disposed so that the abutment part 5 presses against the exterior wall W of the building. At this time, since the length L2 of the jack section 2 and the length L4 of the holder section 6 are formed to be the above-mentioned lengths, the base end of the shaft member 3 of the jack section 2 can be disposed so as to be located within the hollow accommodation space of the holder body 6a. Moreover, the other end of the holder body 6a is disposed so as to be approximately flush with the steel pipe P to which the holder body 6a is fixed. Therefore, as shown in FIG. 1, it is possible to prevent the wall jack 1 from protruding into the work passage WP.

[0055] Therefore, by using the wall hitting jack 1, it is possible to prevent an incident such as a worker hitting his / her head against the wall hitting jack 1 when moving along the work passage WP. Specifically, in a conventional wall jack, it is installed at a height of about 1600 mm from the top surface of the work floor (frame), and the length of the jack (corresponding to the jack part 2 of this wall jack 1) used is long (for example, about 600 mm long). Then, when the distance between the scaffolding and the exterior wall W of the building is 300 mm, the base end of the jack is installed at a height of about 1600 mm in the work passage WP (the space on the top surface of the work floor) with a protruding part of just under 300 mm so as to be approximately perpendicular to the direction of the work passage WP. For this reason, in conventional work sites, there are many cases where workers hit their heads on the protruding jack, which is a problem. Conversely, it may be installed at a height of about 200 mm from the top surface of the work floor (frame), but even in this case, there are more dangerous cases where workers trip over their feet and fall. On the other hand, by using this wall jack 1, it can be arranged so that it does not protrude into the work passage WP, as described above, thereby preventing the occurrence of events that occur when using conventional wall jacks, thereby improving safety.

[0056] Furthermore, the jack section 2 and holder section 6 of the wall hitting jack 1 are connected to each other by an anti-fall mechanism 10. Therefore, when installing the wall hitting jack 1 on scaffolding, even a single worker can easily install it. Moreover, since there is no risk of the jack section 2 coming off the holder section 6, it can be installed safely. Specifically, when using a conventional wall jack, when attaching it to a steel pipe P, first the holder (corresponding to the holder body 6a of this wall jack 1) is temporarily fixed to the steel pipe P of the scaffolding to which it is to be attached. At this time, since the jack is long (for example, about 600 mm long), the insertion opening end of the holder is temporarily fixed in a state where it is offset from the wall surface direction of the building. Next, after inserting the long jack, the holder is rotated so that the tip of the jack faces the outer wall W direction of the building, and then fastened. After that, the length of the jack is adjusted. For this reason, skill is required when installing a conventional wall jack. Moreover, since the holder and the jack are separate, the work requires two people to prevent the jack from falling during the work. On the other hand, in this wall hitting jack 1, the jack part 2 and the holder part 6 are connected to each other by the fall prevention mechanism 10, so that it is possible to prevent the jack part 2 from coming off the holder part 6 during work, thereby preventing the jack part 2 from falling during work. Moreover, because the length of this wall hitting jack 1 is approximately the same as that of the scaffolding and the exterior wall W of the building, it is possible to fasten this wall hitting jack 1 to the scaffolding in a single operation without any special temporary fixing. Therefore, the wall jack 1 can be easily installed by a single worker, improving ease of handling and workability. Moreover, there is no risk of the jack part 2 coming off the holder part 6, improving safety.

[0057] Furthermore, the wall jack 1 can be more easily transported than conventional wall jacks. Specifically, in conventional wall jacks, the holder and jack are separate, and must be transported separately. On the other hand, in the present wall jack 1, the jack part 2 and the holder part 6 are connected to each other by a falling prevention mechanism 10, so there is an advantage that they can be moved in a single transport.

[0058] In addition, since the wall hitting jack 1 can be prevented from protruding into the work passage WP when the wall hitting jack 1 is disposed between the scaffolding and the exterior wall W of the building, the wall hitting jack 1 can be disposed in the desired location. In other words, regardless of the height from the top surface of the work floor (work frame), the wall jack 1 can be installed at any height, which allows for greater freedom in installation location compared to conventional wall jacks. In this case, the wall jack 1 can be installed in an appropriate location that prevents inward tipping and shaking, further improving safety.

[0059] As described above, the wall jack 1 is a product that is far superior to conventional wall jacks in terms of safety for the operator, and is also far superior in terms of ease of handling and workability. [Industrial Applicability]

[0060] The wall jack of this invention is suitable as a compression material to prevent temporary scaffolding at construction sites, etc. from collapsing or shaking. [Explanation of symbols]

[0061] 1. Wall jack of this embodiment 2 Jack section 3 Shaft member 4 Moving parts 4a Movable body 4b Handle 5 Contact part 5a Connecting member 5b Contact member 6 Holder part 6a Holder body 10 Falling prevention mechanism 10a Locking protrusion 10b flange L1 Distance from scaffolding to exterior wall of building L2 Jack length L3 Insertion length of shaft member L4 Length of holder L5 Steel pipe outer diameter P steel pipe CP Clamp WP work passage

Claims

1. A compression member disposed between an exterior wall of a building and a scaffolding erected around the building, The holder includes a holder portion having a hollow holder body with an opening at one end, a jack portion, and a fall prevention mechanism. The jack portion is The holder includes a shaft member having a screw thread formed on its outer peripheral surface, the shaft member being inserted from an opening at one end of the holder body toward the other end of the holder body, a movable part that is rotatably movable along the axial direction of the shaft member while being screwed onto the outer peripheral surface of the shaft member, and a contact part that is connected to the tip of the shaft member and is to be contacted with the exterior wall of a building, The fall-off prevention mechanism includes: The holder body has an opening at one end thereof and a flange extending inward from an inner wall surface of the opening at one end thereof, and a locking projection extending outward from a base end of the shaft-shaped member and capable of locking with the flange. A wall jack characterized by the above.

2. The flange is The length from the base end to the tip end is formed so that a gap is provided between the tip end of the flange and the outer surface of the shaft member, The locking projection is The length from the base end to the tip end is longer than the gap between the tip end of the flange and the outer surface of the shaft member, and the tip end of the locking projection is formed so as not to come into contact with the inner wall surface of the holder body.

2. The wall jack according to claim 1,

3. The flange is formed in an endless ring shape.

3. The wall jack according to claim 1 or 2.

4. The jack portion is The length from the bottom surface of the abutment portion to the base end of the shaft member is 90 mm or more, and is formed so as to be equal to or less than the sum of the distance from the scaffold to the outer wall of the building and the outer diameter of the steel pipe of the scaffold plus 50 mm.

3. The wall jack according to claim 1 or 2.

5. The length from one end to the other end of the holder body of the holder part is It is calculated by subtracting the length of the jack part from the length of the shaft member inserted into the holder body from the total value of the outer diameter of the steel pipe of the scaffolding and the distance from the scaffolding to the exterior wall of the building.

3. The wall jack according to claim 1 or 2.

Images