Retractable steel internal mold device for narrow cavity structure

Abstract

A retractable steel internal mold device for a narrow and small cavity structure is used for concrete pouring construction of a narrow and small cavity and is composed of a rectangular tetrahedron template, a square back ridge, a sliding rail back ridge, an annular support and a fixing bolt. The rectangular tetrahedron template is composed of a steel plate and a steel hinge; the square back arris is vertically welded on the inner side of the rectangular tetrahedron template; the annular supporting position is composed of an upper layer of hollow steel columns and a lower layer of hollow steel columns, clings to the square back arris and is located in the rectangular tetrahedron formwork. A groove is formed in the inner side of the sliding rail back edge and connected with a pulley on the outer side of the annular support. The utility model provides a construction method of a narrow cavity concrete structure formwork, and the formwork can be dismantled and recycled through contraction after pouring is completed. And compared with a traditional wood formwork, the formwork has the advantages of being large in rigidity and flexible to disassemble, and the construction cost can be saved.

Description

TECHNICAL FIELD

[0001] The utility model is used for building cavity modeling concrete pouring construction, especially relates to a retractable steel inner mould device of narrow cavity structure. BACKGROUND

[0002] Nowadays, various buildings are designed with more decorative modeling at the nodes of outer walls, roofs and the like. Considering the cost and structural safety, such modeling often adopts narrow cavity structure, which invisibly improves the construction difficulty of formwork setting and formwork dismantling. There are two conventional methods for such narrow cavity structure at present. One is wood formwork, but the formwork setting, reinforcement, positioning and the like are relatively complex, the formwork cannot be dismantled, and the economic cost is high. The other is filled extruded board, but the inner diameter size is difficult to control, and the filled extruded board cannot be removed. The formwork of the two methods cannot be recycled, and the waste of labor and material cost caused by the increase of building volume will be increasingly obvious, the construction process is relatively slow, the assembly rate is relatively low, and the integrity and aesthetic degree of the cavity cannot be guaranteed. SUMMARY

[0003] The utility model provides a retractable steel inner mould device for narrow cavity structure, which has the advantages of fast construction speed, stable structure, convenient disassembly and recycling.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A retractable steel inner mould device for narrow cavity structure is composed of a rectangular tetrahedron formwork with a front face, a rear face, a left face and a right face, slide rail back battens, square back battens, integral inner supports, fixing bolts and metal hinges.

[0006] Two slide rail back battens and two square back battens are arranged on the inner sides of the left face and the right face of the rectangular tetrahedron formwork, two square back battens are arranged on the inner sides of the front face and the rear face of the rectangular tetrahedron formwork, the integral inner supports are arranged in the inner cavity formed between the rectangular tetrahedron formwork and the slide rail back battens and the square back battens, the fixing bolts are connected to the left face and the right face of the rectangular tetrahedron formwork and extend out of the left face and the right face, and the adjacent two faces are connected through the metal hinges.

[0007] The front face, the rear face, the left face or the right face is welded by two steel plates and two metal hinges; the metal hinges are located at the joint positions of the two steel plates and are welded at the upper and lower positions.

[0008] Four semicircular lifting hooks are welded on the top of the rectangular tetrahedron formwork.

[0009] The utility model discloses a hollow rectangular template is welded by 8 pieces of 3mm thick steel plate. The overall length-width size of the rectangular template is slightly smaller than the concrete cavity of pre-pouring, and the height is the concrete height of each time formwork pouring. The two steel plates of each side of the rectangular template are welded and connected through the two metal hinges in the middle, the hinge is 8*9*3mm, and the two hinges are located at the upper and lower ends of the rectangular tetrahedron template joint respectively.

[0010] In order to facilitate the transportation and removal of the device, a semicircular steel lifting ring is welded on the inner side of the four corners of the rectangular template, which facilitates manual carrying or mechanical lifting when the formwork is removed. Two circular holes with a diameter of 18mm are reserved in the middle of the four rectangular tetrahedron templates of the rectangular long side, so that the fixing screw can pass through the template for reinforcement.

[0011] In order to ensure the rigidity and overall stability of the device, slide rail backrest and square backrest are arranged on the inner side of the rectangular tetrahedron template, which are made of 4*8*3mm hollow square steel. The short sides of the two backrests are welded to the inner side of the rectangular tetrahedron template along the height direction to provide horizontal support for the device.

[0012] The four slide rail backrests are located in the middle of the long side of the rectangular template and are connected with the steel pulley on both sides of the annular inner support.

[0013] The slide rail backrest is composed of an upper backrest, a rectangular steel plate and a lower backrest. The inner side of the upper backrest is provided with a pulley groove, the groove depth is 16mm, and the width is 8mm, which can realize the one-way movement of the steel pulley along the height direction. The rectangular steel plate is located in the middle position of the splicing of the upper backrest and the lower backrest, and when the pulley moves down to the position of the rectangular steel plate, it cannot continue to move down, which plays a role in limiting the lowest height of the pulley. The lower backrest and the square backrest are 4*8*3mm hollow square steel.

[0014] In order to increase the stability of the slide rail backrest, two sides of the steel joint are welded.

[0015] The overall inner support is composed of annular square steel, short vertical connecting rod, long vertical connecting rod, pulley and handrail. By being connected with the slide rail and the square backrest, it can maintain the shape stability of the device under the pressure of the concrete during pouring. The overall inner support is composed of 4 40*60*3mm annular square steels, which are divided into two groups, each group has two. The two annular square steels in each group are arranged in parallel and vertically aligned, and the group is welded and connected by 4 4*8*3mm short vertical connecting rods. The two groups of annular square steels are welded and connected by 2 4*8*3mm long vertical connecting rods to form a whole.

[0016] On both sides of the 4-layer annular square steel long side, 1 group of steel pulleys, 2 in a group, a total of 16 are fixed. By butting the pulley into the pulley groove of the slide rail back ridge, the whole inner support can be freely moved up and down inside the formwork, realizing the installation and removal of the inner support. The steel handrails on the upper part of the annular square steel can facilitate the movement operation of the whole inner support.

[0017] When the formwork is removed, the inner whole inner support is taken out after the pull rod is removed, the formwork and the concrete are separated by compressing the long formwork and driving the metal hinge inward, and the formwork removal is completed.

[0018] The utility model discloses construction speed is fast, and the structure is stable. Since each component is processed in advance, on-site assembly can complete construction. Through the combination of the formwork and the hinge, the device can be retracted after the cavity is poured, and the device can be quickly separated from the concrete structure, the removal and recycling of the narrow cavity forming template can be realized, and a large amount of labor and material cost and construction period can be saved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the side view of the rectangular tetrahedron formwork of the utility model;

[0020] Figure 2 It is the back ridge reinforcing side view of the utility model;

[0021] Figure 3 It is the slide rail back ridge and pulley butt joint schematic view of the utility model;

[0022] Figure 4 It is the slide rail back ridge plan view of the utility model;

[0023] Figure 5 It is the steel pulley side view of the utility model;

[0024] Figure 6 It is the whole inner support side view of the utility model;

[0025] Figure 7 It is the screw rod reinforcing plan view of the utility model;

[0026] Figure 8 It is the reinforcing use schematic view of the utility model;

[0027] Figure 9 It is the formwork in shrinkage removal plan view after the utility model is removed;

[0028] Figure 10 It is the formwork in shrinkage removal side view after the utility model is removed.

[0029] In the diagram: 1. Rectangular tetrahedral template; 2. Slide rail back rib; 3. Square back rib; 4. Overall internal support; 5. Fixing bolt; 1-1. Steel plate; 1-2. Metal hinge; 1-3. Circular hole; 1-4. Semi-circular hook; 2-1. Upper back rib; 2-2. Lower back rib; 2-3. Rectangular steel plate; 2-4. Steel pulley; 2-5. Triangular reinforcing strip; 2-6. Pulley groove; 2-7. Steel gasket; 2-8. Steel clamp; 2-9. Fastening nut; 2-10. Steel bearing; 4-1. Ring square steel; 4-2. Short vertical connecting rod; 4-3. Long vertical connecting rod; 4-4. Steel handrail; 5-1. Tie rod; 5-2. Fixing nut; 6. Concrete wall with cavity; 7. Wooden formwork for wall; 8. Back rib for wall formwork; 9. Horizontal back rib for wall. Detailed Implementation

[0030] To make the purpose, technical solution and advantages of this utility model clearer, the technical solution will be clearly and completely described below with reference to specific embodiments of this utility model and corresponding drawings.

[0031] like Figure 1 As shown, a retractable steel internal mold device for narrow cavity structures consists of a rectangular tetrahedral template 1 with a front, back, left, and right side, a slide rail back rib 2, a square back rib 3, an integral internal support 4, fixing bolts 5, and metal hinges 1-2. Four semi-circular hooks are welded to the top of the rectangular tetrahedral template.

[0032] Two slide rail back ribs and two square back ribs are provided on the inner sides of the left and right sides of the rectangular tetrahedron template. Two square back ribs are provided on the inner sides of the front and back of the rectangular tetrahedron template. The overall internal support is set in the cavity formed between the rectangular tetrahedron template, the slide rail back ribs, and the square back ribs. The left and right sides of the rectangular tetrahedron template are connected by fixing bolts and extend beyond the left and right sides. Adjacent two sides are connected by metal hinges.

[0033] The left or right side is welded together from two large steel plates and two metal hinges; the metal hinges are located at the joint between the two steel plates, with one welded at the top and one at the bottom.

[0034] Both the front and back are welded together from two small steel plates and two metal hinges; the metal hinges are located at the joint between the two steel plates, with one welded at the top and one at the bottom.

[0035] like Figure 2 As shown, the planar dimensions of the rectangular tetrahedral template 1 are slightly smaller than the pre-cast concrete cavity, and its vertical height is the height of the concrete structure poured in one go, generally one story height. To facilitate the description of the specific component positional relationships, a specific data example will be used below for illustration.

[0036] The left and right sides of the rectangular tetrahedron template 1 are 550mm long, and the front and back sides are 250mm long.

[0037] The joints are located at the center of the four sides. To ensure the rigidity and stability of this utility model as a concrete formwork, four sliding rail back ribs 2 and eight square back ribs 3 are evenly welded to the inner sides of the four sides of the rectangular tetrahedral formwork 1. All back ribs are made of 4×8×3mm hollow square steel.

[0038] Four slide rail back ribs 2 are located at the middle of the two long sides of the rectangular tetrahedral template 1, with two ribs welded to each side. The remaining eight square back ribs 3 are evenly distributed.

[0039] like Figure 3 , 4 As shown, the pulley grooves 2-6 of the slide rail back rib 2 are arranged inward, constraining the vertical movement trajectory of the 16 steel pulleys 2-4 welded to the outside of the overall inner support 4.

[0040] like Figure 5 As shown, the steel pulley 2-4 is welded to the outer side of the integral inner support 4 via steel shims 2-7.

[0041] like Figure 6 As shown, during template installation, the operator can hold the steel handrail 4-4 and align the steel pulleys 2-4 on both sides of the integral inner support 4 with the pulley grooves 2-6 on the four slide rail back ribs 2. Then, the integral inner support 4 is installed downwards into the interior of the rectangular tetrahedral template 1. When the lowest steel pulley 2-4 contacts the rectangular steel plate 2-3 welded inside the slide rail back rib 2, it should not be moved further downwards. At this point, the integral inner support 4 is installed. The integral inner support 4 ensures that the template does not shift or shrink during concrete pouring.

[0042] like Figure 6 , 7 As shown, after the overall internal support 4 is installed, the tie rod 5 will pass through the circular hole 1-3 on the steel plate 1-1 and the gap in the middle of the two layers of annular square steel 4-1 to fix the position of the entire device.

[0043] like Figure 8 As shown, during installation, the inner mold of the cavity structure is fixed to the back ribs 8 and 9 of the wall template on the outside of the cavity structure by tie rods 5. Then, concrete is poured, and the cavity structure and the wall are cast in one go.

[0044] like Figure 9 , 10As shown, after the pouring is completed and reaches the condition for removing the formwork, the whole inner support 4 is pulled out upward through the steel handrails 4-4. After the rectangular tetrahedron formwork 1 loses the support, it can be compressed inward, so that the rectangular tetrahedron formwork 1 is separated from the surrounding concrete structure surface layer, and the formwork stripping is realized. Then the whole device is hoisted out of the cavity structure through the semicircular hooks 1-4 at the four corners of the rectangular tetrahedron formwork 1, and the formwork recycling is completed, and the formwork supporting and pouring of the next layer can continue.

Claims

1. A collapsible steel inner form device for use in a tight cavity construction, characterized by The utility model discloses a rectangular tetrahedron template (1) with front, back, left and right, slide rail back ridge (2), square back ridge (3), integral inner support (4), fixed bolt (5), metal hinge are formed, two slide rail back ridges (2) are equipped in the left side and right side of rectangular tetrahedron template (1) respectively, two square back ridges (3) are equipped in the left side and right side of rectangular tetrahedron template (1) respectively, two square back ridges (3) are equipped in the front and back of rectangular tetrahedron template (1) respectively, integral inner support (4) is arranged between rectangular tetrahedron template (1) and the inner cavity formed by slide rail back ridge (2) and square back ridge (3), and fixed bolt (5) is connected with the left side and right side of rectangular tetrahedron template (1) and extends out of the left side and right side, and adjacent two sides are connected through metal hinge.

2. The retractable steel inner formwork assembly for use in a narrow cavity construction according to claim 1, wherein: The front, back, left or right is welded by two steel plates (1-1) and two metal hinges (1-2);Metal hinge (1-2) is located at the joint position of two steel plates (1-1), and one is welded above and below.

3. The retractable steel inner formwork assembly for use in a tight cavity structure according to claim 1, wherein: Four semicircular hooks (1-4) are welded on the top of rectangular tetrahedron template (1).

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