Boom for aerial work equipment

Abstract

The present invention relates to a boom for aerial work equipment, which has a reinforcing material, such as carbon fiber, inserted into the inner or outer side of a side wall to significantly improve strength against bending load and lateral load as well as yield strength against locally occurring partial loads relative to the weight, and to minimize the weight of the equipment.

Description

Boom in aerial work equipment

[0001] The present invention relates to a boom for aerial work equipment, which has a reinforcing material (e.g., carbon fiber) inserted into the inner or outer side of a side wall to significantly improve the strength against bending load and lateral load as well as the yield strength against locally occurring partial loads relative to the weight, and to minimize the weight of the equipment.

[0002] Aerial work equipment includes ladder trucks, cranes, and other equipment for towing, transporting loads, or firefighting, and can use multi-stage booms to move objects or workers to work locations for aerial work such as high-rise buildings or utility poles.

[0003] The multi-stage boom of the aerial work equipment is extended sequentially like a telescope, or retracted in reverse order.

[0004] In order to improve the strength of the boom that is pulled out in this way, a boom utilizing a conventional composite structure is disclosed, for example, as disclosed in patent document (US7,781,039 B2).

[0005] Referring to FIG. 5 of the patent document, a boom (22) utilizing a conventional composite structure is constructed by welding together four steel plates (42A, 42B, 42C, 42D). The four steel plates (42A-42D) form a hollow structure having a rectangular cross-section. Each of the steel plates (42A-42D) has an outer surface (44A, 44B, 44C, 44D), respectively. Upper and lower reinforcing layers (34A, 34B) are bonded to the outer surfaces (44A, 44C) of the steel plates (42A, 42C). The reinforcing layers (34A, 34B) are preferably bonded to the upper steel plate (42A) and the lower steel plate (42C), since these are the steel plates that typically experience the greatest tensile and compressive forces due to vertical loads.

[0006] Therefore, by reinforcing and strengthening the steel plate (42A, 42C), the stress applied to the steel plate can be reduced and the deflection resistance of the boom (22) can be improved.

[0007] The reinforcing layers (34A and 34B) are formed of a reinforcing composite including a matrix material and high tensile modulus fibers.

[0008] Referring to FIG. 7 of the patent document, the upper and lower reinforcing layers (34A, 34B) can be fixed to the upper and lower steel plates (42A, 42C) by curing the resin.

[0009] Referring to FIG. 8 of the patent document, the upper and lower reinforcing layers (34A, 34B) can be attached to the upper and lower steel plates (42A, 42C) using an adhesive (54).

[0010] Referring to FIG. 9 of the patent document, the upper and lower reinforcing layers (34A, 34B) can be joined to the upper and lower steel plates (42A, 42C) using mechanical fasteners (56).

[0011] Since such reinforcing layers (34A, 34B) are fixed to the steel plates (42A, 42C) through resin, adhesive (54), and mechanical fasteners (56), the cost increases due to the time-consuming and complex process, and since they are fixed and exposed to the outer surface of the steel plate, they react more sensitively to external environments such as the weather, which may weaken durability.

[0012] [Prior Art Literature]

[0013] [Patent Document]

[0014] (Patent Document 1) U.S. Patent Publication No. US7,781,039 B2

[0015] The present invention, through one embodiment, seeks to provide a boom for aerial work equipment that is not only very easy to install reinforcement materials in appropriate locations but also improves productivity and economy through light weight and high rigidity of the equipment.

[0016] In order to solve the above-described problem, the present invention comprises: facing side walls; a lower connecting member connecting the side walls; and a reinforcing member installed on the side walls, wherein each of the side walls may include: a side plate; upper and lower plates extending inward from the upper and lower sides of the side plates; and an insertion portion formed along the longitudinal direction of the inner or outer sides of the upper plate and the side plate or the lower plate and the side plate, into which the reinforcing member is inserted.

[0017] As described above, the boom for high-altitude work equipment according to the embodiment of the present invention can have the following effects.

[0018] According to one embodiment of the present invention, the side wall is implemented as a profile extruded from aluminum, so that a suitable location for installing a reinforcing material can be easily formed.

[0019] According to one embodiment of the present invention, installation can be completed simply by inserting a reinforcing material along the length of the insertion portion of the side wall, making installation very easy.

[0020] According to one embodiment of the present invention, by forming the insertion rail groove supporting the reinforcing material to be tapered at an acute angle, the original thickness of the side wall and the reinforcing material can be maintained as much as possible, thereby further increasing the strength.

[0021] According to one embodiment of the present invention, by forming an adhesive filling hole and a concave groove along the longitudinal direction of the side wall, the flow of the filled adhesive is facilitated, thereby firmly attaching the reinforcing material to the side wall and firmly preventing detachment in the longitudinal direction.

[0022] According to one embodiment of the present invention, a raised portion corresponding to a concave groove is formed on the outer surface of the side plate, so that when sliding with an adjacent boom, the raised portion forms a contact area close to a line contact in the form of a belt-shaped contact surface, thereby enabling smooth deployment or storage.

[0023] According to one embodiment of the present invention, by riveting the reinforcement to the side wall, the reinforcement is mechanically connected to the side wall, thereby firmly preventing longitudinal detachment of the reinforcement.

[0024] Figures 1 and 2 are side views showing boom deployment and boom storage of an aluminum crane for high-altitude work according to a preferred embodiment of the present invention.

[0025] Figure 3 is a front view illustrating the boom of Figure 1.

[0026] Figure 4 is a perspective view showing the side wall of Figure 3 from the inside.

[0027] Fig. 5 is a perspective view of inserting a reinforcing material into the insertion portion of the side wall of Fig. 3.

[0028] Fig. 6 is a perspective view of the side wall with the reinforcement of Fig. 5 installed from the outside.

[0029] Figure 7 is a front view of Figure 6.

[0030] Figure 8 is a cross-sectional view taken along line 8-8 of Figure 6.

[0031] Fig. 8a is a cross-sectional view illustrating another embodiment of Fig. 8.

[0032] Figure 9 is a front view showing reinforcement riveted to the side wall.

[0033] Figures 10 to 17 are front views showing other embodiments of Figure 8.

[0034] Figure 17a is a front view showing a hybrid of an inner insert and a hollow insert.

[0035] Figures 18 and 19 are side views showing boom deployment and boom storage of a ladder truck for transporting loads.

[0036] Fig. 20 is a front view showing the boom of Fig. 18.

[0037] The embodiments described below are provided as examples to aid in understanding the invention, and it should be understood that the present invention can be implemented with various modifications different from the embodiments described herein. However, when describing the present invention, if it is determined that a detailed description of a related known function or component may unnecessarily obscure the gist of the present invention, a detailed description and specific illustration thereof will be omitted. In addition, the attached drawings are not drawn to scale to aid in understanding the invention, and the dimensions of some components may be exaggerated.

[0038] The first and second terms used in this application may be used to describe various components, but the components should not be limited by the terms. The terms are used solely to distinguish one component from another.

[0039] In addition, the terminology used in this application is only used to describe specific embodiments and is not intended to limit the scope of the rights. The singular expression includes the plural expression unless the context clearly indicates otherwise. It should be understood that the terms "comprises," "consists of," or "consists of" in this application are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0040] FIG. 1 and FIG. 2 are side views showing boom deployment and boom storage of an aluminum crane for high-altitude work according to a preferred embodiment of the present invention, and FIG. 3 is a front view showing the boom of FIG. 1.

[0041] Referring to FIGS. 1 and 2, the boom (1) of the aluminum crane for high-altitude work is a multi-stage boom that can be deployed (see FIG. 1) or stored (see FIG. 2) like a telescope.

[0042] Referring to FIG. 3, a boom (1) according to the present embodiment may include a boom member (10) and a reinforcing member (30) inserted and installed into the boom member (10). The reinforcing member (30) may be installed on the inside or outside of the boom member (10), or on both the inside and outside. The reinforcing member (30) may include, for example, carbon fiber. Carbon fiber has high strength (2 to 5 times the rigidity of aluminum and steel relative to its weight), high lightness (about 60% of aluminum), high corrosion resistance (excellent resistance to corrosion results in a long lifespan and improved durability), and the physical properties of carbon materials and the morphological characteristics of fibers are combined to provide excellent heat resistance, impact resistance, wear resistance, and earthquake resistance, and flexibility in design (can be manufactured in various shapes).

[0043] The boom (10) of Fig. 3 has a box shape and may include opposing side walls (100), a lower connecting member (140) connecting the lower and upper parts of the side walls (100), and an upper connecting member (150).

[0044] The side wall (100) can be formed of an aluminum profile that is extruded in the longitudinal direction (the direction in which it is unfolded and stored) in a T-shape.

[0045] The lower connecting member (140) and the upper connecting member (150) may include transverse bars or transverse plates installed at regular intervals along the length of the side wall (100).

[0046] FIG. 4 is a perspective view showing the side wall of FIG. 3 from the inside, FIG. 5 is a perspective view showing a reinforcing material inserted into an insertion portion of the side wall of FIG. 3, FIG. 6 is a perspective view showing the side wall of FIG. 5 with the reinforcing material installed from the outside, FIG. 7 is a front view of FIG. 6, and FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 6.

[0047] Referring to FIGS. 4 to 7, the side wall (100) may include a side plate (110). The side plate (110) may be a vertical plate.

[0048] The side wall (100) may include upper and lower plates (120)(130). The upper and lower plates (120)(130) may be horizontal plates extending inward from the upper and lower sides of the side plate (110).

[0049] The side wall (100) may include an insert (170). The insert (170) may have a reinforcing material (30) inserted and installed as shown in FIG. 5.

[0050] Referring to FIGS. 4 and 7, the insertion portion (170) may include an insertion groove (171) for an inner edge. The insertion groove (171) for an inner edge may be formed along the length direction at an inner edge of the upper plate (120) and the side plate (110). The inner edge may include the inner side of the upper plate (120) and the upper inner side of the side plate (110).

[0051] Referring to FIGS. 4 and 7, the insertion portion (170) may include an insertion rail groove (173) for the inner edge. The insertion rail groove (173) for the inner edge may be formed at both ends of the insertion groove (171) for the inner edge. The insertion rail groove (173) for the inner edge may be a U-shaped groove. The insertion rail groove (173) for the inner edge may support both ends of the reinforcing material (30) to prevent it from being dislodged inward.

[0052] Referring to FIGS. 5 and 7, the reinforcing member (30) may include an inner corner reinforcing member (31). The inner corner reinforcing member (31) may be inserted and received in an L-shaped inner corner insertion groove (171) and an inner corner insertion rail groove (173).

[0053] In this way, by inserting the inner corner reinforcing material (31) into the inner corner insertion groove (171) and the inner corner insertion rail groove (173), the most vulnerable part of the boom (10) can be reinforced most efficiently. Accordingly, while maintaining the weight of the boom (10), it is possible to prevent the boom (10) from sagging, twisting, or breaking during operation due to external force or wind.

[0054] Furthermore, referring to FIGS. 4 to 7, the insertion portion (170) may further include an insertion groove (175) for the inner side of the side plate. The insertion groove (175) for the inner side of the side plate may be a vertical groove. The insertion groove (175) for the inner side of the side plate may be formed along the longitudinal direction on the inner side near the center of the side plate (110).

[0055] Additionally, the insertion portion (170) may include a side plate inner insertion rail groove (177) in the shape of the letter “ㄷ.” The side plate inner insertion rail groove (177) may be formed at both ends of the side plate inner insertion groove (175).

[0056] The reinforcing member (30) may include a reinforcing member (33) for the inner side of the I-shaped side plate. The reinforcing member (33) for the inner side of the side plate may be inserted and received in the insertion groove (175) for the inner side of the side plate and the insertion rail groove (177) for the inner side of the side plate.

[0057] Meanwhile, referring to FIGS. 6 and 8, the side wall (100) may include an adhesive filling hole (180). The adhesive filling hole (180) may be formed in the side wall (100) at the portion where the reinforcing material (30) is inserted. For example, the adhesive filling hole (180) may be formed penetrating the side plate (110) and the upper plate (120). The adhesive filling hole (180) can further adhere the inserted reinforcing material (30) to the side wall (100) and reliably prevent it from being detached in the longitudinal direction.

[0058] In addition, the side wall (100) may include a concave groove (190). The concave groove (190) may be formed along the length direction on the inner side of the insertion portion (170) so as to be in communication with the adhesive filling hole (180). The concave groove (190) may serve as a flow passage through which the adhesive filled into the adhesive filling hole (180) flows along the length direction, thereby allowing the adhesive to quickly permeate the reinforcing material (30).

[0059] The concave groove (190) is a groove that is sunken from the inside to the outside of the side wall (100), so that a raised portion (181) can be formed and reinforced in the area where the adhesive filling hole (180) is located to reinforce this sunken groove. The raised portion (181) is raised by the amount of the sunken portion of the concave groove (190), so that it not only compensates for the reduction in thickness of the side wall (100), but also forms a belt-shaped contact surface when sliding with an adjacent boom, so that deployment or storage can be performed smoothly.

[0060] Unlike the insertion part of FIG. 8, the insertion part of FIG. 8a may include an insertion groove (175') for the inner side of the side plate and an insertion groove (176') for the inner side of the lower plate in an L shape.

[0061] Additionally, the insertion portion of FIG. 8a may include an insertion rail groove (177') for the inner side of the side plate at the end of the insertion groove (175') for the inner side of the side plate and an insertion groove (176') for the inner side of the lower plate.

[0062] The reinforcing member (33') of Fig. 8a has an L shape and can be inserted and installed in the side plate inner insertion groove (175'), the lower plate inner insertion groove (176'), and the side plate / lower plate inner insertion rail groove (177').

[0063] Figure 9 is a front view showing a reinforcement (30) riveted to a side wall (100).

[0064] Referring to Fig. 9, the reinforcing material (30) can be mechanically joined to the side wall (100) by riveting with a rivet (R). The rivet (R) is a blind rivet, and when the rivet shaft is inserted into the rivet hole (RH) and pulled with a gun, a rivet head is created on the opposite side, thereby completing the riveting.

[0065] Figures 10 to 17 are front views showing other embodiments of Figure 8.

[0066] Fig. 10 is similar in structure and function to Figs. 8 and 9, but differs in that the insertion portion (170a) and the reinforcing material (30a) are formed integrally, and other parts are the same, so the same reference numerals are given and detailed descriptions are omitted.

[0067] That is, referring to Fig. 10, the insertion portion (170a) may include an L-shaped inner insertion groove (171a). The inner insertion groove (171a) may be integrally formed along the length direction on the inner side of the side plate (110) and the inner side of the upper plate (120).

[0068] The insertion portion (170a) may include an inner insertion rail groove (173a) in the shape of the letter “ㄷ.” The inner insertion rail groove (173a) may be formed at both ends of the inner insertion groove (171a).

[0069] The reinforcing member (30a) may include an inner reinforcing member (30a) that is integrally inserted into the inner insertion groove (171a) and the inner insertion rail groove (173a).

[0070] Referring to Fig. 11, the insertion portion (170b) may include a hollow insertion groove (170b) in a T-shape. The hollow insertion groove (170b) may be integrally formed along the length direction within the side wall (100). That is, the hollow insertion groove (170b) may include a hollow insertion groove (171b) of the side plate (110), a hollow insertion groove (172b) of the upper plate (120), and a hollow insertion groove (173b) of the lower plate (130).

[0071] The reinforcing member (30b) may include a hollow reinforcing member (30b) having a U-shape inserted into the hollow insertion groove (170b). That is, the hollow reinforcing member (30b) may include a hollow reinforcing member (31b) of the side plate (110), a hollow reinforcing member (32b) of the upper plate (120), and a hollow reinforcing member (33b) of the lower plate (130).

[0072] In this way, by inserting and installing the reinforcing material (30b) into the hollow insertion groove (170b) formed inside the side wall (100), not only is insertion easier, but strength can also be greatly improved by surrounding it integrally.

[0073] Referring to Fig. 12, the insertion portion (170c) can be divided into an upper hollow insertion groove (171c) and a lower hollow insertion groove (173c). That is, the upper hollow insertion groove (171c) can be formed in an L-shape on the inside of the upper corner, and the lower hollow insertion groove (173c) can be formed in an L-shape on the inside of the lower corner.

[0074] The reinforcing material (30c) may include an upper hollow reinforcing material (31c) inserted into an upper hollow insertion groove (171c), and a lower hollow reinforcing material (33c) inserted into a lower hollow insertion groove (173c).

[0075] Meanwhile, referring to FIGS. 13 to 15, the side wall (100') may include a side plate (110') and upper and lower plates (120') (130').

[0076] The side wall (100') may include an insert (170'). A reinforcing member (30') may be inserted and installed into the insert (170').

[0077] The insertion portion (170') may include an insertion groove (171') for the inner corner, an insertion rail groove (173') for the inner corner, an insertion groove (175') for the inner side of the side plate, and an insertion rail groove (177') for the inner side of the side plate.

[0078] In particular, the insertion rail groove (173') for the inner corner and the insertion rail groove (177') for the inner side of the side plate may be formed as a groove tapered at an acute angle.

[0079] Unlike the T-shaped insertion rail groove (173')(177'), the acutely tapered insertion rail groove can further increase rigidity by maintaining the thickness (T1) of the side wall (100') thicker than the thickness (t1) of the side wall (100).

[0080] Likewise, the reinforcing member (30') may include an inner corner reinforcing member (31') and an inner side plate reinforcing member (33'). Both ends of the inner corner reinforcing member (31') and the inner side plate reinforcing member (33') may also be formed with acutely tapered grooves. Accordingly, the thickness (T2) of the acutely tapered reinforcing member (30') may be maintained to be thicker than the thickness (t2) of the reinforcing member (30), thereby further increasing the rigidity.

[0081] The insertion part (170a') and the reinforcing material (30a') referring to Fig. 16 are similar in structure and function to the insertion part (170') and the reinforcing material (30') of Fig. 15, but differ in that they are formed as one piece.

[0082] That is, referring to FIG. 16, the insertion portion (170a') may include an inner insertion groove (171a') and an inner insertion rail groove (173a').

[0083] The inner insertion groove (171a') can be formed integrally along the length direction on the inner side of the side plate (110') and the inner side of the upper plate (120').

[0084] The inner insertion rail groove (173a') can be formed as a groove tapered at an acute angle at both ends of the inner insertion groove (171a').

[0085] The reinforcing member (30a') may also include an inner reinforcing member (30a') inserted into an inner insertion groove (171a') and an inner insertion rail groove (173a').

[0086] Both ends of the inner reinforcement (30a') can also be tapered to an acute angle.

[0087] Figure 17 is a front view showing a boom with reinforcements installed on the inner and outer sides of the side walls.

[0088] Referring to FIG. 17, the side wall (100'') may include a side plate (110'') and upper and lower plates (120'') (130'').

[0089] The inner side of the side plate (110'') may include an inner insert (170'') and an inner reinforcement (30'') as in Fig. 15.

[0090] The inner insertion portion (170'') may include an inner corner insertion groove (171'') formed at the inner corner of the side plate (110'') and the upper plate (120''), and an inner corner insertion rail groove (173'') formed at both ends of the inner corner insertion groove (171'') and tapered at an acute angle.

[0091] The reinforcement (30'') may include an inner corner reinforcement (31'') that is inserted into an inner corner insertion groove (171''). Both ends of the inner corner reinforcement (31'') may be tapered at an acute angle to be inserted into an inner corner insertion rail groove (173'').

[0092] The inner insertion portion (170'') may include an inner insertion groove (175'') formed on the inner side of the center of the side plate (110'') and an inner insertion rail groove (177'') formed at both ends of the inner insertion groove (175'') and tapered at an acute angle.

[0093] The reinforcement (30'') may include an inner reinforcement (33'') that is inserted into an inner insertion groove (175''). Both ends of the inner reinforcement (31'') may be tapered at an acute angle to be inserted into an inner insertion rail groove (177'').

[0094] Referring to Fig. 17, the outer side of the side plate (110'') may include an outer insert (170a'') and an outer reinforcing member (30a'').

[0095] The outer insertion portion (170a'') may include an upper outer insertion groove (171a'') formed on the upper outer side of the side plate (110'') and an upper outer insertion rail groove (173a'') tapered at an acute angle at both ends thereof.

[0096] The corresponding outer reinforcement (30a'') may include an upper outer reinforcement (31a'') inserted into an upper outer insertion groove (171a'') and an upper outer insertion rail groove (173a''). Both ends of the upper outer reinforcement (31a'') may also be tapered at an acute angle.

[0097] In addition, the outer insertion portion (170a'') may include a lower outer insertion groove (175a'') formed on the lower outer side of the side plate (110'') and a lower outer insertion rail groove (177a'') tapered at an acute angle at both ends thereof.

[0098] The corresponding outer reinforcement (30a'') may include a lower outer reinforcement (33a'') inserted into a lower outer insertion groove (175a'') and a lower outer insertion rail groove (177a''). Both ends of the lower outer reinforcement (33a'') may also be tapered at an acute angle.

[0099] Figure 17a is a front view showing a hybrid of an inner insert and a hollow insert.

[0100] The inner insertion portion of Fig. 17a may include an inner insertion groove (171d) formed from the inner side of the upper plate (120) and the upper side of the side plate (110) to below the center, and an inner insertion rail groove (173d) formed at both ends of the inner insertion groove (171d).

[0101] The inner reinforcement (30d) of Fig. 17a may include an inner reinforcement (31d) that is inserted and installed in an inner insertion groove (171d) and an inner insertion rail groove (173d).

[0102] Additionally, the inner insertion portion of FIG. 17a may include a hollow insertion groove (175d) formed on the lower side of the side plate (110) and the inside of the lower plate (130).

[0103] The inner reinforcement (30d) of Fig. 17a may include a hollow reinforcement (33d) that is inserted and installed in a hollow insertion groove (175d).

[0104] Figures 18 and 19 are side views showing boom deployment and boom storage of a ladder truck for transporting loads.

[0105] The boom (1') of the ladder truck is similar in structure and function to the boom (1) of the crane, but differs in that there is no upper connecting member connecting the upper part of the boom (10'), as shown in Fig. 20.

[0106] That is, the boom (10') of the ladder truck may include a lower connecting member (14') connecting the side wall (10a') and the lower part of the side wall (10a').

[0107] The side wall (10a') may include a side plate (11') and upper and lower plates (12') (13') extending inward from the upper side of the side plate (11'). The profile of this side wall (10') is merely extruded to fit a ladder truck, and the insertion portion and reinforcing material of the side wall for a crane may be applied as is.

[0108] That is, the insertion part shown in FIGS. 1 to 17 and the reinforcing material can be inserted and installed in the side plate (11') of the ladder truck boom (10').

[0109] As described above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations can be made within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0110] [Explanation of symbols]

[0111] 1,1': Boom 10,10': Boom

[0112] 30: Reinforcement (carbon fiber) 100: Side wall

[0113] 110: Side plate 120,130: Upper and lower plates

[0114] 170: Insert 171: Insert for inner corner

[0115] 173: Insert rail groove for inner corner 175: Insert for inner corner

[0116] 177: Inner insert rail groove 180: Adhesive filling hole

[0117] 190: Omok Euro Home

Claims

1. It includes a facing side wall, a lower connecting member connecting the side wall, and a reinforcing member installed on the side wall. Each of the above side walls, Side plates and, Upper and lower plates extending inward from the upper and lower sides of the above side plates, It is formed along the longitudinal direction of the inner or outer side of the upper plate and the side plate or the lower plate and the side plate, and includes an insertion part into which the reinforcing material is inserted. Boom in high-altitude work equipment.

2. In paragraph 1, The above insertion part, An insertion groove for the inner corner formed along the length direction on the inner corner of the upper plate and side plate, It includes an insertion rail groove for the inner corner formed at both ends of the insertion groove for the inner corner, The above reinforcing material is, Including an inner corner reinforcement member inserted into the inner corner insertion groove and the inner corner insertion rail groove, Boom in high-altitude work equipment.

3. In paragraph 1, The above insertion part, An insertion groove for the inner side of the side plate formed along the longitudinal direction on the inner side of the side plate, It further includes a side plate inner insertion rail groove formed at both ends of the side plate inner insertion groove, The above reinforcing material further includes a side plate inner reinforcing material inserted into the side plate inner insertion groove and the side plate inner insertion rail groove. Boom in high-altitude work equipment.

4. In paragraph 1, The above insertion part, An inner insertion groove formed along the longitudinal direction on the inner side of the upper plate and side plate, It includes an inner insertion rail groove formed at both ends of the inner insertion groove, The above reinforcing material is inserted into the inner insertion groove and the inner insertion rail groove. Boom in high-altitude work equipment.

5. In paragraph 1, The above insertion part, Including a hollow insertion groove formed hollowly along the longitudinal direction inside the upper and lower plates and the side plates, The above reinforcing material is, Inserted into the above hollow insertion groove, Boom in high-altitude work equipment.

6. In paragraph 2, The above hollow insertion groove is, It is divided into an upper hollow insertion groove and a lower hollow insertion groove, The above reinforcing material is, Including an upper reinforcing member and a lower reinforcing member inserted into the upper hollow insertion groove and the lower hollow insertion groove, Boom in high-altitude work equipment.

7. In any one of paragraphs 2 to 6, Both ends of the above insertion rail home, Includes an insert rail groove tapered at an acute angle, Both ends of the above reinforcement, A tapered insertion rail groove tapered at an acute angle, Boom in high-altitude work equipment.

8. In any one of paragraphs 2 to 6, An adhesive filling hole communicating with the insertion groove is formed on the side wall. Boom in high-altitude work equipment.

9. In paragraph 8, On the inside of the above insertion groove, a concave groove communicating with the adhesive filling hole is formed. Boom in high-altitude work equipment.

10. In any one of paragraphs 2 to 6, The above reinforcement is riveted to the side wall, Boom in high-altitude work equipment.

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