An adjustable and fast-expandable steel support flexible end joint and a method of using the same

Abstract

The present invention relates to the technical field of foundation pit engineering, and specifically to an adjustable and rapidly retractable steel support flexible end joint and a method for using the same, comprising an inner steel cylinder and an outer steel cylinder, and characterized in that: the inner steel cylinder and the outer steel cylinder are nested with each other, a pair of wedge-shaped openings are opened on the side of the outer steel cylinder, two wedge-shaped tooth tiles are inserted into the wedge-shaped openings, tooth marks are arranged on the inner side of the wedge-shaped tooth tiles, tooth marks are arranged on the inner steel cylinder, and the tooth marks of the inner steel cylinder are meshed with the tooth marks of the wedge-shaped tooth tiles. The invention has the advantages that: the design of the inner steel cylinder and the outer steel cylinder being nested with each other is adopted, so that the function of the steel support being adjustable and rapidly retractable is realized, and the effect of applying stable prestress to the steel support is achieved; the design of the inclined wedge-shaped opening and the wedge-shaped tooth tile is adopted, so that the function of micro-adjustment of the steel support is realized, the control difficulty of the original construction tool during operation is reduced, and the accuracy of the prestress is improved.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit engineering, and in particular to an adjustable and fast-expandable steel support flexible end joint and a use method thereof. Background Art

[0002] At present, in the construction of foundation pit steel support in my country, the traditional method is to apply prestress after erecting the steel support to make it reach a balanced state. After the prestress is applied, the flexible end is fixed by a wedge. The wedge is easy to lose and damage, and the axial force of the steel support is easy to lose, which poses a safety hazard. The newer "load-retaining flexible head" bolts are large, easy to rust, and difficult to maintain. Manual operation is extremely inconvenient and troublesome to use. It requires multiple people to cooperate in operation, with low operating efficiency and unreliable precision of the applied prestress. Summary of the invention

[0003] The purpose of the present invention is to meet the needs of prestressing steel supports, improve the accuracy of prestressing, shorten the time required for installation, disassembly and turnover of steel supports, improve construction efficiency, and provide an adjustable and quickly retractable steel support flexible end joint and a method of using the same.

[0004] In order to achieve the above-mentioned purpose, an adjustable and quickly retractable steel support flexible end joint is designed, comprising an inner steel cylinder and an outer steel cylinder, characterized in that: the inner steel cylinder and the outer steel cylinder are nested with each other, a pair of wedge-shaped openings are opened on the side of the outer steel cylinder, two wedge-shaped tooth tiles are inserted into the wedge-shaped openings, tooth marks are arranged on the inner side of the wedge-shaped tooth tiles, tooth marks are arranged on the inner steel cylinder, and the tooth marks of the inner steel cylinder are meshed with the tooth marks of the wedge-shaped tooth tiles.

[0005] Preferably, the outer surface of the inner steel cylinder is provided with non-helical tooth marks, the pitch is 10 mm, and the tooth mark depth is 5 mm.

[0006] Preferably, the wedge-shaped opening has a transverse angle of 3.6° with the cross-sectional direction of the outer steel cylinder, an opening angle of 116°, and an axial opening length of 110 mm.

[0007] Preferably, the wedge-shaped tooth shoe opening angle is 80°

[0008] Preferably, there is an elastic steel sheet on the outer side of the wedge-shaped tooth shoe.

[0009] Preferably, the wedge-shaped tooth shoe can rotate left and right in the wedge-shaped opening of the outer steel cylinder.

[0010] The method for using the above-mentioned adjustable and fast-retractable steel support flexible end joint is as follows:

[0011] S1. After the excavation of the support position and the erection of the standard steel support, the adjustable and fast-expanding steel support flexible end joint is transported to the installation position as a whole, so that the outer steel cylinder is connected to the standard steel support, and the base of the inner steel cylinder is tightly fitted with the surrounding structure. It is necessary to ensure that the expansion and contraction of the inner steel cylinder meets the pre-lengthening (support axial force) requirements, otherwise it is adjusted through the short steel support;

[0012] S2. After adjusting the steel support as required, install the two prestressed cylinders manually or mechanically. After checking various parameters and construction conditions, apply prestress to the two prestressed cylinders at the same time according to the designed axial force. At this time, loosen the locking screws to cause the gear bushes to pop open and disengage, and the inner steel cylinder moves in telescopic manner inside the outer steel cylinder.

[0013] S3. After the prestressing oil cylinder reaches the specified reading, adjust the wedge-shaped tooth shoes in the wedge-shaped openings on both sides, and rotate left and right in the wedge-shaped openings of the outer steel cylinder so that the non-helical tooth marks of the wedge-shaped tooth shoes fit tightly with the non-helical tooth marks of the inner steel cylinder to ensure that the prestressing loss is within a reasonable range;

[0014] S4. After the adjustment of the wedge-shaped toothed shoe is completed, tighten the locking screws on both sides until the bottom of the nut of the locking screw is connected to the outer surface of the wedge-shaped toothed shoe without any gap, so that the wedge-shaped toothed shoe is fixed in the wedge-shaped opening to ensure that the applied prestress remains stable and the construction safety is guaranteed;

[0015] S5. After the installation is completed, the two prestressed oil cylinders are retracted, and the adjustable and fast-expanding steel support flexible end joints are installed. The prestressing monitoring of the steel support is strengthened. When there is an abnormality, the prestressing of the steel support can be quickly adjusted;

[0016] S6. The disassembly process of the adjustable and quick-retractable steel support flexible end joint is the reverse process of the installation process. Repeat the above steps to proceed to the next construction.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The design of nesting the inner and outer steel cylinders realizes the adjustable and rapid expansion and contraction of the steel support, achieving the effect of stable prestressing of the steel support;

[0019] 2. The inclined wedge-shaped opening and wedge-shaped tooth shoe design are adopted to realize the function of micro-adjustment of steel support, reduce the control difficulty of the original construction tools during operation, and improve the accuracy of prestressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the front view of the overall structure of the present invention;

[0021] Figure 2 It is a rear view of the overall structure of the present invention;

[0022] Figure 3 It is a side view of the inner steel cylinder structure of the present invention;

[0023] Figure 4 This is a front view of the inner steel cylinder structure of the present invention;

[0024] Figure 5 This is a front view of the wedge-shaped tooth shoe of the present invention;

[0025] Figure 6 This is a rear view of the wedge-shaped tooth shoe of the present invention;

[0026] Figure 7 is a side view of the wedge-shaped tooth shoe of the present invention;

[0027] In the figure: 1. Inner steel cylinder 2. Prestressed oil cylinder 3. Outer steel cylinder 4. Locking screw 5. Wedge-shaped tooth shoe 1-1. Base 1-2. Non-helical tooth mark 5-1. Non-helical tooth mark on the inner side of the tooth shoe 5-2. Elastic spring piece. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings, and the structure and principle of the present invention are very clear to people in the field. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Embodiment 1: The present invention designs an adjustable and fast-retractable steel support flexible end joint, which consists of three core components: an inner steel cylinder, an outer steel cylinder, a pair of wedge-shaped tooth shoes, and other accessories include locking screws and elastic steel sheets.

[0030] The inner steel cylinder is composed of a base and a non-helical tooth-marked steel cylinder. As one of the main load-bearing components of the steel support active end, the base is in direct contact with the enclosure structure, and the non-helical tooth-marked steel cylinder penetrates into the outer steel cylinder, and the inner and outer steel cylinders are nested with each other. The inner steel cylinder has a wall thickness of 30mm and has non-helical tooth marks on its surface. The pitch is 10mm, the tooth mark depth is 5mm, and the number of tooth marks is usually 33 according to actual needs. The load-bearing base is custom-made from 30mm steel plate. The base is equipped with reinforced ribs to strengthen the overall rigidity of the inner steel cylinder. Jack operation panels are set on both sides of the base for prestressing construction.

[0031] One end of the outer steel cylinder is nested with the inner steel cylinder to form the main load-bearing component of the steel support flexible end, and the other end is connected to the universal steel support with a wall thickness of 30mm. There is a pair of wedge-shaped openings on the steel outer cylinder, with an angle of about 3.6° between the opening and the cross-sectional direction of the outer steel cylinder. The opening angle is 116° and the axial opening length is 110mm, which is used for the working space of a pair of wedge-shaped toothed shoes. There are six locking screws on both sides of the opening.

[0032] There are two wedge-shaped tooth shoes, each with an opening angle of 80°, and the other dimensions are consistent with the wedge-shaped opening. The inner side of the wedge-shaped tooth shoe also has non-helical tooth marks, which can mesh with the tooth marks on the inner steel cylinder. There is an elastic steel sheet on the outer side of the wedge-shaped tooth shoe. The wedge-shaped tooth shoe can rotate left and right within the wedge-shaped opening of the outer cylinder to a limited angle of 36°.

[0033] Embodiment 2: The steps for using the above-mentioned adjustable and fast-retractable steel support flexible end joint are as follows:

[0034] S1. After the excavation of the support position and the erection of the standard steel support, the adjustable and fast-expanding steel support flexible end joint is transported to the installation position as a whole, so that the outer steel cylinder is connected to the standard steel support, and the base of the inner steel cylinder is tightly fitted with the surrounding structure. It is necessary to ensure that the expansion and contraction of the inner steel cylinder meets the pre-lengthening (support axial force) requirements, otherwise it is adjusted through the short steel support;

[0035] S2. After adjusting the steel support as required, install the two prestressed cylinders manually or mechanically. After checking various parameters and construction conditions, apply prestress to the two prestressed cylinders at the same time according to the designed axial force. At this time, loosen the locking screws to cause the gear bushes to pop open and disengage, and the inner steel cylinder moves in telescopic manner inside the outer steel cylinder.

[0036] S3. After the prestressing oil cylinder reaches the specified reading, adjust the wedge-shaped tooth shoes in the wedge-shaped openings on both sides, and rotate left and right in the wedge-shaped openings of the outer steel cylinder so that the non-helical tooth marks of the wedge-shaped tooth shoes fit tightly with the non-helical tooth marks of the inner steel cylinder to ensure that the prestressing loss is within a reasonable range;

[0037] S4. After the adjustment of the wedge-shaped toothed shoe is completed, tighten the locking screws on both sides until the bottom of the nut of the locking screw is connected to the outer surface of the wedge-shaped toothed shoe without any gap, so that the wedge-shaped toothed shoe is fixed in the wedge-shaped opening to ensure that the applied prestress remains stable and the construction safety is guaranteed;

[0038] S5. After the installation is completed, the two prestressed oil cylinders are retracted, and the adjustable and fast-expanding steel support flexible end joints are installed. The prestressing monitoring of the steel support is strengthened. When there is an abnormality, the prestressing of the steel support can be quickly adjusted;

[0039] S6. The disassembly process of the adjustable and quick-retractable steel support flexible end joint is the reverse process of the installation process. Repeat the above steps to proceed to the next construction.

Claims

1. An adjustable and fast-expandable steel support flexible end joint, comprising an inner steel cylinder and an outer steel cylinder, characterized in that: The inner steel cylinder and the outer steel cylinder are nested with each other, a pair of wedge-shaped openings are opened on the side of the outer steel cylinder, two wedge-shaped tooth shoes are inserted into the wedge-shaped openings, the inner side of the wedge-shaped tooth shoes is provided with tooth marks, the inner steel cylinder is provided with tooth marks, and the tooth marks of the inner steel cylinder are meshed with the tooth marks of the wedge-shaped tooth shoes; The wedge-shaped opening has a lateral angle of 3.6° with the cross-sectional direction of the outer steel cylinder, an opening angle of 116°, and an axial opening length of 110 mm; The opening angle of the wedge-shaped tooth shoe is 80°; The outer side of the wedge-shaped tooth shoe is provided with an elastic steel sheet; The wedge-shaped tooth shoe can rotate left and right in the wedge-shaped opening of the outer steel cylinder.

2. The adjustable and fast-retractable steel support flexible end joint according to claim 1, characterized in that: The outer surface of the inner steel cylinder is provided with non-helical tooth marks, the pitch is 10mm, and the depth of the tooth marks is 5mm.

3. A method for using an adjustable and rapidly retractable steel support flexible end joint, using the adjustable and rapidly retractable steel support flexible end joint as claimed in claim 1 or 2, characterized in that: The steps of the method are as follows: S1. After the excavation of the support position and the erection of the standard section steel support are completed, the adjustable and fast-expanding steel support flexible end joint is transported to the installation position as a whole, so that the outer steel cylinder is connected to the standard section steel support, and the base of the inner steel cylinder is tightly fitted with the surrounding structure. It is necessary to ensure that the expansion and contraction amount of the inner steel cylinder meets the pre-extension length requirements, otherwise it is adjusted through the short section steel support; S2. After adjusting the steel support as required, install the two prestressed cylinders manually or mechanically. After checking various parameters and construction conditions, apply prestress to the two prestressed cylinders at the same time according to the designed axial force. At this time, loosen the locking screws to cause the gear bushes to pop open and disengage, and the inner steel cylinder moves in telescopic manner inside the outer steel cylinder. S3. After the prestressing oil cylinder reaches the specified reading, adjust the wedge-shaped tooth shoes in the wedge-shaped openings on both sides, and rotate left and right in the wedge-shaped openings of the outer steel cylinder so that the non-helical tooth marks of the wedge-shaped tooth shoes fit tightly with the non-helical tooth marks of the inner steel cylinder to ensure that the prestressing loss is within a reasonable range; S4. After the adjustment of the wedge-shaped toothed shoe is completed, tighten the locking screws on both sides until the bottom of the nut of the locking screw is connected to the outer surface of the wedge-shaped toothed shoe without any gap, so that the wedge-shaped toothed shoe is fixed in the wedge-shaped opening to ensure that the applied prestress remains stable and the construction safety is guaranteed; S5. After the installation is completed, the two prestressed oil cylinders are retracted, and the adjustable and fast-expanding steel support flexible end joints are installed. The prestressing monitoring of the steel support is strengthened. When there is an abnormality, the prestressing of the steel support can be quickly adjusted; S6. The disassembly process of the adjustable and quick-retractable steel support flexible end joint is the reverse process of the installation process. Repeat the above steps to proceed to the next construction.

Images