Bolt sleeve for connecting steel bars

Abstract

A bolt sleeve for connecting reinforcing steel bars comprises a top plate, a bottom plate, a force transmission barrel and a closed side plate, the upper portion of the force transmission barrel is fixedly connected with the top plate, and the force transmission barrel is fixedly connected with the bottom plate; a bolt mounting side hole is formed in the cylinder body on one side between the top plate and the bottom plate, and a closed side plate is arranged outside the side hole; the center of the top plate is provided with an internal thread top hole connected with one end of a steel bar, and the center of the bottom plate is provided with a through hole connected through bolts. The bolt sleeve for connecting the reinforcing steel bars is simplified in process and good in connection reliability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of reinforcing steel bar connection, especially a bolt sleeve for connecting reinforcing steel bars. BACKGROUND

[0002] The existing reinforcing steel bar connection methods mainly include welding method, mechanical connection method, sleeve grout anchor connection method and the like. The welding method and the mechanical connection method such as straight thread sleeve connection method are economical and reliable, and are mainly used for the connection of reinforcing steel bars in cast-in-place concrete members. In the existing fabricated concrete member connection, the effective connection of reinforcing steel bars is an important link for guaranteeing the integrity of the concrete structure. Therefore, various reinforcing steel bar connection methods have been created in practice, and the commonly used methods include sleeve grout anchor connection method, sleeve lap joint connection method and the like. The common feature of these connection methods is that they all need to use the grouting process to ensure the reliability of the connection. However, the process is complex, the quality is difficult to detect, the action lines of the two ends of the connected reinforcing steel bars deviate, the force transmission effect is reduced, and the connection cost is also relatively high. SUMMARY

[0003] In order to solve the problems of complex process, difficult quality detection, uncertain reliability and high cost of the reinforcing steel bar connection method in the current fabricated concrete structure, the utility model provides a bolt sleeve for connecting reinforcing steel bars, which has simplified process and good connection reliability.

[0004] The utility model adopts the technical scheme that:

[0005] A bolt sleeve for connecting reinforcing steel bars, comprising a top plate, a bottom plate, a force transmission cylinder body and a closed side plate, the upper part of the force transmission cylinder body is fixedly connected with the top plate, and the force transmission cylinder body is fixedly connected with the bottom plate; a bolt mounting side hole is formed in the side cylinder between the top plate and the bottom plate, and the side hole is provided with the closed side plate outside; the center of the top plate is provided with an internally threaded top hole for connecting one end of a reinforcing steel bar; and the center of the bottom plate is provided with a through hole for bolt connection.

[0006] The above basic scheme is a connection structure of a prefabricated one-end reinforcing steel bar, one end of the reinforcing steel bar is provided with a threaded segment, and is fixedly connected in the internally threaded top hole of the top plate.

[0007] Further, the force transmission cylinder body is provided with a side plate guide rail, and the closed side plate is movably installed on the side plate guide rail.

[0008] Preferably, the outer side of the closed side plate is provided with a side plate handle.

[0009] Further, the top plate and the bottom plate are both circular steel plates.

[0010] Further, the bolt sleeve has two, which are an upper bolt sleeve and a lower bolt sleeve, the through hole of the bottom plate of the upper bolt sleeve and the through hole of the bottom plate of the lower bolt sleeve are connected and are connected through a bolt fastener. This scheme is a scheme for realizing the connection of the upper and lower reinforcing steel bars when applied.

[0011] Preferably, the bolt fastener comprises a bolt and a nut, the bolt is located in the bottom plate of the upper bolt sleeve, the nut is located in the bottom plate of the lower bolt sleeve, and the bolt is screwed with the nut through the bottom plate through hole of the upper bolt sleeve and the bottom plate through hole of the lower bolt sleeve.

[0012] Or: the bolt fastener comprises a bolt and a nut, the bolt is located in the bottom plate of the lower bolt sleeve, the nut is located in the bottom plate of the upper bolt sleeve, and the bolt is screwed with the nut through the bottom plate through hole of the lower bolt sleeve and the bottom plate through hole of the upper bolt sleeve.

[0013] The technical concept of the utility model is: adhere to the basic principle of steel bar connection, namely equal strength, reliable and effective, utilize a steel bar bolt connection sleeve, realize reliable and convenient connection of steel bars, and can be applied to steel bar connection of various positions of the fabricated concrete member. The core of the utility model is the structure form and design calculation of the steel bar bolt connection sleeve and the selection of the matched bolt, and the feature is that the force transmission between the two ends of the connected steel bars can be guaranteed and the non-deviation state can be maintained.

[0014] Based on the current steel bar and steel structure design standards and specifications, after the concrete structure design is completed, the steel bars that need to be connected can be determined, the connection design is carried out by taking the nominal diameter of the steel bar as the basic parameter, the steel bar bolt connection sleeve is connected with one end of the member steel bar in the factory, and the member prefabrication is completed; the steel bar bolt connection sleeves at the two ends of the required connection member can be directly connected by using the bolt fastener at the engineering site, and the direct force transmission target of the steel bar is realized.

[0015] The beneficial effects of the utility model mainly lie in: simplified process, good connection reliability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front view of the bolt sleeve for connecting steel bars.

[0017] Figure 2 It is a side view of the bolt sleeve for connecting steel bars, wherein (a) is a closed side plate guide rail and side hole, and (b) is a closed side plate and handle.

[0018] Figure 3 It is a schematic view of the bolt fastener.

[0019] The reference signs are: top hole 1; through hole 2; top plate 3; bottom plate 4; force transmission cylinder body 5; steel bar force action line 6; closed side plate 7; side plate guide rail 8; side plate handle 9; side hole 10; bolt 11; nut 12. DETAILED DESCRIPTION

[0020] The utility model will be further described below in combination with the drawings.

[0021] Referring to Figure 1 , Figure 2 and Figure 3 , a bolt sleeve for connecting steel bars comprises a top plate 3, a bottom plate 4, a force transmission cylinder 5, and a closing side plate 7. The upper part of the force transmission cylinder 5 is fixedly connected with the top plate 3 (usually by screwing), and the lower part of the force transmission cylinder 5 is fixedly connected with the bottom plate 4 (usually by screwing). A bolt mounting side hole 10 is formed in the side cylinder between the top plate 3 and the bottom plate 4, and the side hole 10 is provided with the closing side plate 7. The center of the top plate 3 is provided with an internally threaded top hole 1 for connecting with one end of a steel bar, and the center of the bottom plate 4 is provided with a through hole 2 for bolt connection.

[0022] Further, the force transmission cylinder 5 is provided with a side plate guide rail 8, and the closing side plate 7 is movably installed on the side plate guide rail 8.

[0023] Preferably, the outer side of the closing side plate 7 is provided with a side plate handle 9. The handle is used to facilitate the operation of moving the side plate up and down.

[0024] Further preferably, the top plate 3 and the bottom plate 4 are both circular steel plates.

[0025] Further, the bolt sleeve has two, namely an upper bolt sleeve and a lower bolt sleeve, and the bottom plate through hole of the upper bolt sleeve and the bottom plate through hole of the lower bolt sleeve are connected and connected by a bolt fastener. This scheme is to realize the connection of the upper and lower steel bars when applied.

[0026] Preferably, the bolt fastener comprises a bolt 11 and a nut 12, the bolt is located in the bottom plate of the upper bolt sleeve, the nut is located in the bottom plate of the lower bolt sleeve, and the bolt is screwed with the nut through the bottom plate through hole of the upper bolt sleeve and the bottom plate through hole of the lower bolt sleeve.

[0027] Alternatively, the bolt fastener comprises a bolt and a nut, the bolt is located in the bottom plate of the lower bolt sleeve, the nut is located in the bottom plate of the upper bolt sleeve, and the bolt is screwed with the nut through the bottom plate through hole of the lower bolt sleeve and the bottom plate through hole of the upper bolt sleeve.

[0028] In this embodiment, the center of the top plate 3 is provided with a top hole 1, and the thread in the top hole 1 is connected with the thread of one end of a steel bar. The center of the bottom plate 4 is provided with a through hole 2 for connecting the bolt fastener, and the side hole 10 of the force transmission cylinder 5 is used for placing the bolt.

[0029] The basic requirements of the bolt sleeve for connecting steel bars in this embodiment are:

[0030] 1.1) The ultimate tensile load bearing capacity and shear bearing capacity of the bolt sleeve connecting the steel bars should be greater than the corresponding ultimate bearing capacity of the connected steel bars; the tensile strength f y ′ and shear strength f v ′ of the material of the connecting bolt must be greater than the corresponding strength of the material of the connected steel bars, d represents the nominal diameter of the connected steel bars and also serves as the nominal diameter of the bolt.

[0031] 1.2) The outer surface of the barrel of the bolt sleeve connecting the steel bars is indented to increase the friction between the connecting surfaces and the adhesion to the concrete;

[0032] 1.3) The bolt is a grade 9.8 high-strength bolt;

[0033] 1.4) The thickness of the force transmission barrel 5 is K; the hole diameter of the through hole 2 is D (D = d + 2 mm), the minimum effective distance j from the center of the connecting hole to each side should ensure the normal use of the nut, the thickness of the top plate 3 is t = 10 ~ 15 mm, the thickness of the bottom plate 4 is T = t + (2 ~ 5) mm; L1 is the total length of the high-strength connecting bolt, which is determined according to the bolt standard; the net height of the bolt sleeve connecting the steel bars (the net distance between the top and bottom plates) L > L1.

[0034] 1.5) The bolt sleeve connecting the steel bars can be made of high-strength steel material; the thickness of the concrete protective layer should meet the requirements of the current concrete design specification, and the thickness of the concrete protective layer at the outer edge of the bolt sleeve connecting the steel bars can be smaller than that of the reinforced concrete protective layer, but not less than 10 mm.

[0035] The bolt sleeve connecting the steel bars of the embodiment realizes the method of steel bolt connection, and the process is as follows:

[0036] 1) Determine the barrel thickness K and the thread length of the top hole 1 of the bolt sleeve connecting the steel bars according to the diameter d of the steel bar, and make the bolt sleeve connecting the steel bars;

[0037] 2) Connect the steel bar with the top hole 1.

[0038] 3) Fix the connected steel bars and the bolt sleeve connecting the steel bars with the steel bar mesh in the component according to the design positioning, adjust the bottom plate 4 of each sleeve and the connecting section concrete in the same plane, and pour the concrete to form a prefabricated component.

[0039] 4) Select the connecting bolt between the bolt sleeves connecting the steel bars.

[0040] 5) Align the through holes 2 of the steel bolt sleeves on both sides of the connecting surface according to the pretightening force requirement of the high-strength bolt, and connect them with the bolt fastener.

[0041] 6) After checking that the connecting bolts of each steel bar on the connecting surface reach the requirement of pre-tightening force, fill the bolt cavity of the bolt sleeve of the connecting steel bar with high-strength mortar through the side hole 10, and after filling, slide into the closing side plate 7 along the side plate guide rail 8. This step can also be performed together after the connection of all connecting surfaces is completed.

[0042] The embodiments described in the specification are only enumerations of the implementation forms of the utility model concept, and are only for the purpose of description. The protection scope of the utility model should not be regarded as being limited to the specific forms described in the embodiments, and the protection scope of the utility model also extends to equivalent technical means that can be thought of by those skilled in the art according to the utility model concept.

Claims

1. A bolt sleeve for connecting reinforcing bars, characterised in that, It includes a top plate, a bottom plate, a force transmission cylinder and a closed side plate, the upper part of the force transmission cylinder is fixedly connected with the top plate, and the force transmission cylinder is fixedly connected with the bottom plate; a bolt mounting side hole is formed in the side cylinder between the top plate and the bottom plate, and the side hole is provided with the closed side plate; the center of the top plate is provided with an internally threaded top hole connected with one end of a steel bar, and the center of the bottom plate is provided with a through hole connected with a bolt.

2. A bolt sleeve for connecting reinforcing bars as claimed in claim 1, characterised in that The force transmission cylinder is provided with a side plate guide rail, and the closed side plate is movably installed on the side plate guide rail.

3. A bolt sleeve for connecting reinforcing bars as claimed in claim 2, wherein, The outer side of the closed side plate is provided with a side plate handle.

4. A bolt sleeve for connecting reinforcing bars according to any one of claims 1 to 3, characterised in that, The top plate and the bottom plate are both circular steel plates.

5. A bolt sleeve for connecting reinforcing bars according to any one of claims 1 to 3, characterised in that, The bolt sleeve has two, which are an upper bolt sleeve and a lower bolt sleeve, the bottom plate through hole of the upper bolt sleeve and the bottom plate through hole of the lower bolt sleeve are connected and fixedly connected through a bolt fastener.

6. A bolt sleeve for connecting reinforcing bars as claimed in claim 5, wherein, The bolt fastener includes a bolt and a nut, the bolt is located in the bottom plate of the upper bolt sleeve, the nut is located in the bottom plate of the lower bolt sleeve, and the bolt is threadedly connected with the nut through the bottom plate through hole of the upper bolt sleeve and the bottom plate through hole of the lower bolt sleeve.

7. A bolt sleeve for connecting reinforcing bars as claimed in claim 5 wherein, The bolt fastener includes a bolt and a nut, the bolt is located in the bottom plate of the upper bolt sleeve, the nut is located in the bottom plate of the lower bolt sleeve, and the bolt is threadedly connected with the nut through the bottom plate through hole of the upper bolt sleeve and the bottom plate through hole of the lower bolt sleeve. The bolt fastener includes a bolt and a nut, the bolt is located in the bottom plate of the upper bolt sleeve, the nut is located in the bottom plate of the lower bolt sleeve, and the bolt is threadedly connected with the nut through the bottom plate through hole of the upper bolt sleeve and the bottom plate through hole of the lower bolt sleeve.

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