Buckle type positioning embedded casing pipe mounting base

Abstract

The utility model discloses a buckle type positioning embedded sleeve mounting base which is suitable for a rail transit shield tunnel. The thickness of the steel through hole circular-tube-shaped base is matched with that of a shield segment mold bottom plate, the diameter of the steel through hole circular-tube-shaped base is matched with that of a segment mold bottom plate mounting hole, and the shape of an inner cavity of the steel through hole circular-tube-shaped base is matched with the shape and the size of the cross section of a buckle position of a buckle type positioning embedded sleeve; the bottom surface of the mounting base is divided into a plurality of parts, and each part is processed into an inclined surface; during installation, after the buckle type positioning embedded sleeve is inserted into the installation base and rotates by a certain angle, the waterproof sealing gasket is tightened through the inclined face of the bottom end face, so that slurry leakage at the contact face of the positioning embedded sleeve and the mold bottom plate during duct piece production is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of rail transit shield tunnel engineering, and specifically relates to a buckle type positioning embedded sleeve installation base. BACKGROUND

[0002] In order to not affect the service life of the shield tunnel segment, not reduce the mechanical and electrical equipment, prevent stray current, prevent lightning, and not loosen the equipment during operation, etc. when installing the mechanical and electrical equipment on the shield tunnel segment, a positioning embedded sleeve is usually embedded on the surface of the shield tunnel segment according to certain rules to reserve a hole for installing the mechanical and electrical equipment. During the prefabrication of the shield tunnel segment, the positioning embedded sleeve is embedded in the shield tunnel segment through the positioning pipe fixed on the bottom plate of the shield tunnel segment mold. In order to improve the prefabrication efficiency of the shield tunnel segment, a buckle type positioning embedded sleeve is usually selected. In the prior art, the buckle of the buckle type positioning embedded sleeve is directly pressed into the installation hole of the bottom plate of the segment mold, and the buckle is connected to the lower surface of the mold bottom plate. Since there is a tolerance (±0.65 mm) in the thickness of the steel plate used for the bottom plate of the shield tunnel segment mold, the steel plate is processed into a curved bottom plate of the mold, the ductility of each part of the steel plate is inconsistent, the processed mold bottom plate needs to be polished, and the repeated use of the mold to produce the segment causes serious damage to the mold bottom plate by the cement mortar. The contact surface between the buckle and the lower surface of the mold bottom plate is curved, and when the pressing method is used for installation, the pressure applied on the sealing gasket decreases after the hand is removed. The produced segment needs to be subjected to high-frequency vibration and other factors, so that the leakage of the cement mortar at the embedded position on the surface of the segment becomes a common phenomenon, which seriously affects the production quality of the segment.

[0003] Therefore, it is necessary to further optimize the installation method of the buckle type positioning embedded sleeve on the mold bottom plate, so as to ensure the production efficiency of the segment without affecting the production quality of the shield tunnel segment. SUMMARY

[0004] The utility model discloses a buckle type positioning embedded sleeve installation base, which is fixed on the bottom plate of the segment through sub-arc welding during the production of the mold of the shield tunnel segment, and then the upper surface of the mold bottom plate is polished to make the mold bottom plate an integral whole. When the shield tunnel segment is produced, the buckle type positioning embedded sleeve is pressed into the inner cavity of the installation base and rotated by about 90 degrees. The inclined surface formed on the bottom surface of the installation base compresses the waterproof gasket of the positioning embedded sleeve, so as to prevent the leakage of the cement mortar and improve the production efficiency of the shield tunnel segment without affecting the quality of the shield tunnel segment.

[0005] The utility model discloses a buckle type positioning embedded sleeve installation base, which is fixed on the bottom plate of the segment through sub-arc welding during the production of the mold of the shield tunnel segment, and then the upper surface of the mold bottom plate is polished to make the mold bottom plate an integral whole. When the shield tunnel segment is produced, the buckle type positioning embedded sleeve is pressed into the inner cavity of the installation base and rotated by about 90 degrees. The inclined surface formed on the bottom surface of the installation base compresses the waterproof gasket of the positioning embedded sleeve, so as to prevent the leakage of the cement mortar and improve the production efficiency of the shield tunnel segment without affecting the quality of the shield tunnel segment.

[0006] The buckle type positioning embedded sleeve installation base is characterized in that the installation base is made of round steel or threaded strip, and the strength of the installation base after being made is not less than 8.8 grade; the installation base is inlaid on a segment mold base plate, the thickness of the installation base is adapted to the thickness of the segment mold base plate, and the diameter of the installation base is adapted to the installation hole reserved on the segment mold base plate; the inner cavity of the installation base is a through hole, the shape of the inner cavity is the same as the sectional shape of the buckle part of the positioning embedded sleeve and is adapted in size; the top surface of the installation base is a plane, and after being inlaid on the segment mold base plate, the top surface is welded, polished and polished, and forms a unified whole with the upper surface of the segment mold base plate; the bottom surface of the installation base is divided into several equal parts according to the shape of the sectional shape of the buckle part of the positioning embedded sleeve, and the bottom surface of the installation base is finely processed from low to high in the same rotation direction for each equal part, so that the bottom surface of the installation base is made into an inclined surface; during installation, the buckle type positioning embedded sleeve is inserted into the installation base and then rotated by a certain angle, and the flange on the positioning embedded sleeve and the inclined surface of the bottom surface of the installation base are used to continuously press the silica gel waterproof gasket.

[0007] The buckle type positioning embedded sleeve installation base is characterized in that the installation base is made of round steel or threaded strip, and the strength of the installation base after being made is not less than 8.8 grade; the installation base is inlaid on a segment mold base plate, the thickness of the installation base is adapted to the thickness of the segment mold base plate, and the diameter of the installation base is adapted to the installation hole reserved on the segment mold base plate; the inner cavity of the installation base is a through hole, the shape of the inner cavity is the same as the sectional shape of the buckle part of the positioning embedded sleeve and is adapted in size; the top surface of the installation base is a plane, and after being inlaid on the segment mold base plate, the top surface is welded, polished and polished, and forms a unified whole with the upper surface of the segment mold base plate; the bottom surface of the installation base is divided into several equal parts according to the shape of the sectional shape of the buckle part of the positioning embedded sleeve, and the bottom surface of the installation base is finely processed from low to high in the same rotation direction for each equal part, so that the bottom surface of the installation base is made into an inclined surface; during installation, the buckle type positioning embedded sleeve is inserted into the installation base and then rotated by a certain angle, and the flange on the positioning embedded sleeve and the inclined surface of the bottom surface of the installation base are used to continuously press the silica gel waterproof gasket. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 The buckle type positioning embedded sleeve is a prior art.

[0009] Figure 2 The buckle type positioning embedded sleeve is another prior art.

[0010] Figure 3 The buckle type positioning embedded sleeve is a third prior art.

[0011] Figure 4 The installation base is matched with the first buckle type positioning embedded sleeve of the prior art;

[0012] Figure 5 The installation base is matched with another buckle type positioning embedded sleeve of the prior art;

[0013] Figure 6 The installation base is matched with the third buckle type positioning embedded sleeve of the prior art. DETAILED DESCRIPTION

[0014] The utility model will be further described below with reference to the drawings.

[0015] Figure 1 , Figure 2 , Figure 3 The diagram shows a snap-fit ​​positioning embedded sleeve with 2 to 4 snaps on the left end of the sleeve, including: 1- snap-fit ​​positioning sleeve; 2- embedded sleeve; 3- snap; 4- flange at the left end of the embedded sleeve; 5- cut at the connection between the positioning sleeve and the embedded sleeve.

[0016] Figure 4 This utility model is a mounting base that is compatible with the existing first type of snap-fit ​​positioning pre-embedded sleeve, wherein: 6-the upper top surface of the mounting base; 7-the lower bottom surface of the mounting base; 71, 72-two semi-circular precision-machined areas of the lower bottom surface divided by the line AB as the axis of symmetry; 8-the inner cavity of the mounting base; d-the thickness of the mounting base.

[0017] Figure 5 This utility model is a mounting base that is compatible with another existing snap-fit ​​positioning pre-embedded sleeve, wherein: 6-the upper top surface of the mounting base; 7-the lower bottom surface of the mounting base; 71, 72, 73-three areas that the lower bottom surface is divided into equally, with the curvature of AB, BC, and CA all being 120°; 8-the inner cavity of the mounting base; d-the thickness of the mounting base.

[0018] Figure 6 This utility model is a mounting base that is compatible with the existing third type of snap-fit ​​positioning pre-embedded sleeve, wherein: 6-the top surface of the mounting base; 7-the bottom surface of the mounting base; 71, 72, 73, 74-four precision-machined areas of the bottom surface divided into symmetrical axes along the AB line and the CD line; 8-the inner cavity of the mounting base; d-the thickness of the mounting base.

[0019] Example 1

[0020] Figure 4 Is with Figure 1 Matching mounting base, Figure 1 , Figure 4 This embodiment illustrates one implementation of a snap-fit ​​positioning pre-embedded sleeve mounting base;

[0021] The mounting base is machined from round steel or circular threaded strips, comprising a circular top surface 6, a circular bottom surface 7, and an inner cavity. Figure 4 The round tube that is matched with the snap-fit ​​positioning pre-embedded sleeve shown is preferably made of threaded strip for mounting base. The internal thread is fitted into the mounting hole reserved in the mold base plate and matches the external thread of the mounting base to ensure that the produced segment mold is durable.

[0022] The top surface 6 of the mounting base is flat. During installation, the upper surface of the mounting base is flush with the upper surface of the mold base plate. After argon arc welding, the weld is ground and polished to make the mounting base and the mold base plate integrated.

[0023] The bottom surface 7 of the mounting base is divided into two precision machining areas, 71 and 72, with the line AB as the axis of symmetry. 71 is machined from point A to point B, and 72 is machined from point B to point A in the same direction to form two inclined surfaces from low to high. The drop between the high point and the low point of the inclined surface can be easily controlled within 1.2 to 1.5 mm to accommodate the thickness tolerance of the steel plate used to make the mold base plate, the inconsistent ductility of different parts when bending the steel plate into the mold base plate, and the influence of factors such as uniform grinding and polishing of the upper surface of the mold base plate on the thickness of the mold base plate.

[0024] The inner cavity 8 of the mounting base is a through hole, and is connected to... Figure 4 The cross-sectional shape and size of the positioning pre-embedded sleeve buckle shown are adapted to facilitate the insertion of the positioning pre-embedded sleeve into the installation base;

[0025] The thickness d of the mounting base is greater than the thickness of the steel plate of the segment mold base, so that when using steel plates of different thicknesses (12mm or 14mm) to make segment molds, the snap-on positioning pre-embedded sleeve can also be universally used.

[0026] The processed mounting base has a strength of not less than 8.8 grade, which slows down the wear rate of cement mortar on the mold base plate during the production of pipe segments.

[0027] When making the segment mold, the mounting base is embedded in the base plate of the segment mold, and the upper surface of the base plate is welded, ground and polished so that the top surface of the mounting base and the base plate of the mold form a whole, ensuring that the surface of the segment is beautiful.

[0028] The thickness d of the mounting base is matched with the length between the snap-on positioning pre-embedded sleeve 3 and the flange 4 and the thickness of the silicone waterproof gasket, so that when the snap-on positioning pre-embedded sleeve is installed in the mounting base of the segment mold base plate, there is sufficient pressure on the silicone waterproof sealing gasket between the positioning pre-embedded sleeve and the mold base plate.

[0029] During the production of tunnel segments, Figure 1 The snap-fit ​​positioning pre-embedded sleeve shown is inserted into the base plate of the segment mold and mounted on the base. Figure 4 After rotating the inner cavity of the mounting base at an appropriate angle, tighten it using the two inclined surfaces 71 and 72 on the bottom surface of the mounting base. Figure 1 The silicone waterproof sealing gasket positioned between the snap-fit ​​positioning embedded sleeve and the mold base plate, as shown, will... Figure 1 The positioning pre-embedded sleeve shown is firmly snapped onto the lower surface of the mold base plate, ensuring that there is no grout leakage at the pre-embedded point on the surface of the pipe segment when grout is injected into the mold or when the mortar inside the mold is vibrated.

[0030] Implementation Case 2

[0031] Figure 5 Is with Figure 2The mounting base for the matching snap-fit ​​positioning pre-embedded sleeve differs from the implementation case in that the bottom surface 7 of the mounting base is divided into three finely machined areas 71, 72, and 73. Among them, 71 from point A to point B, 72 from point B to point C, and 73 from point C to point A are machined into three inclined surfaces in the same direction from low to high.

[0032] During the production of tunnel segments, Figure 2 The snap-fit ​​positioning pre-embedded sleeve shown is inserted into the base plate of the segment mold and mounted on the base. Figure 5 After rotating the inner cavity to an appropriate angle, tighten it using the three inclined surfaces 71, 72, and 73 on the bottom surface of the mounting base. Figure 2 The silicone waterproof sealing gasket positioned between the snap-fit ​​positioning embedded sleeve and the mold base plate, as shown, will... Figure 2 The positioning pre-embedded sleeve shown is firmly snapped onto the lower surface of the mold base plate.

[0033] Implementation Case 3

[0034] Figure 6 Is with Figure 3 The mounting base for the third type of snap-fit ​​positioning embedded sleeve differs from the implementation case in that the bottom surface 7 of the mounting base is divided into four precision-machined areas 71, 72, 73, and 74 with the AB line and the CD line as the axis of symmetry. Among them, 71 from point A to point D, 72 from point D to point B, 73 from point B to point C, and 74 from point C to point A are machined into four inclined surfaces in the same direction from low to high.

[0035] During the production of tunnel segments, Figure 3 The snap-fit ​​positioning pre-embedded sleeve shown is inserted into the base plate of the segment mold and mounted on the base. Figure 6 After rotating the inner cavity of the mounting base to an appropriate angle, tighten it using the four inclined surfaces 71, 72, 73, and 74 on the bottom surface of the mounting base. Figure 3 The silicone waterproof sealing gasket positioned between the snap-fit ​​positioning embedded sleeve and the mold base plate, as shown, will... Figure 3 The positioning pre-embedded sleeve shown is firmly snapped onto the lower surface of the mold base plate.

[0036] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit them. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent or substantially identical substitutions can be made to some or all of the features therein. However, these modifications or substitutions do not cause the relevant modified technical solutions to fall outside the protection scope of the claims of this utility model application.

Claims

1. A snap-in positioning pre-buried sleeve installation base, characterized in that, The mounting base is made of round steel or threaded strip, and the strength is not less than 8.8; The mounting base is embedded in the segment mold bottom plate, the thickness is adapted to the thickness of the segment mold bottom plate, and the diameter is adapted to the mounting hole reserved on the segment mold bottom plate; The inner cavity of the mounting base is a through hole, the shape of the inner cavity is the same as the cross-sectional shape of the positioning embedded sleeve buckle, and the size is adapted; The top surface of the mounting base is a plane, after being embedded in the mold bottom plate, welding, polishing and polishing are performed, and the top surface of the segment mold bottom plate is formed as a whole; The bottom surface of the mounting base is divided into several equal parts according to the shape of the cross section of the positioning embedded sleeve buckle, and the thickness of the mounting base is finely processed from low to high in the same rotation direction for each equal part, so that the bottom surface of the mounting base is formed as an inclined surface; During installation, the buckle type positioning embedded sleeve is inserted into the mounting base and then rotated by a certain angle, and the flange on the positioning embedded sleeve and the inclined surface of the bottom surface of the mounting base are used to continuously press the silica gel waterproof gasket.

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