Novel cold extrusion sleeve

Abstract

The utility model relates to the technical field of tunnel construction steel bar cold pressing, in particular to a novel cold extrusion sleeve. Comprising a novel sleeve, the novel sleeve comprises a sleeve wall, a sleeve cavity is formed in the sleeve wall, an inner baffle is arranged in the center of the sleeve cavity and divides the sleeve cavity into a first sleeve cavity and a second sleeve cavity, and the first sleeve cavity and the second sleeve cavity are in mirror symmetry relative to the inner baffle; the outer side of the sleeve wall is provided with a boundary mark, and the radial symmetry axis of the boundary mark is located on the center cross section of the sleeve cavity. An inner baffle is arranged in the improved sleeve, a constructor can accurately stretch steel bars into the sleeve, the depth length is guaranteed through the baffle, and it is guaranteed that the joint of the two steel bars is located in the center of the sleeve. An extrusion center boundary mark is arranged outside the sleeve, so that a reliable and accurate extrusion position can be provided for an extrusion operator, and the boundary mark is prevented from being extruded. According to the scheme, positioning of the inner center and the outer center of the sleeve is facilitated, and the qualified rate of extruded finished products is well increased.

Description

Technical Field

[0001] The utility model relates to the technical field of cold pressing of steel bars in tunnel construction, in particular to a novel cold extrusion sleeve. Background Art

[0002] At present, domestic tunnel construction has taken into account many factors such as construction cost, safety, and quality. The steel bars in the surrounding rock lining construction of tunnels IV, V and above have gradually transformed from the original binding lap joint, single-sided lap welding, and double-sided lap welding to cold extrusion sleeve connection. During the cold extrusion process, two sections of steel bars need to be placed at both ends of the sleeve, and the connection between the two sections of steel bars is located in the center of the sleeve for the best extrusion effect. However, the existing sleeve requires manual multiple measurements to ensure that the steel bars are in place, and the judgment of the sleeve center position during extrusion is also visual. Figure 1 As shown in the figure, manual measurement and visual inspection often result in the connection between the two sections of steel bars deviating from the center of the sleeve. The sleeve center position cannot be determined from the outside, causing the jack to squeeze the connection between the two sections of steel bars, resulting in an offset indentation, which does not meet the requirement of uniform distribution. Therefore, it is necessary to improve the sleeve structure to facilitate the positioning of the sleeve center. Utility Model Content

[0003] Problem to be solved: Provide a cold extruded sleeve with accurate center positioning.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new type of cold extruded sleeve, including a new type of sleeve, the new type of sleeve including a sleeve wall, a sleeve cavity inside the sleeve wall, an inner baffle plate at the center of the sleeve cavity, the inner baffle plate divides the sleeve cavity into sleeve cavity one and sleeve cavity two, sleeve cavity one and sleeve cavity two are mirror-symmetrical relative to the inner baffle plate; a dividing mark is provided on the outside of the sleeve wall, and the radial symmetry axis of the dividing mark is located on the central cross section of the sleeve cavity.

[0005] Preferably, both ends of the sleeve wall are provided with chamfered surfaces, and the chamfered surfaces are inclined from the inner side of the sleeve wall to the outer side of the sleeve wall.

[0006] Preferably, the inner baffle is integrally formed on the inner wall of the sleeve.

[0007] Preferably, the thickness of the inner baffle is 3mm-5mm.

[0008] Preferably, the boundary mark is a plurality of protrusions arranged at intervals, and the plurality of protrusions are integrally formed on the outer side of the sleeve wall.

[0009] Preferably, the boundary mark surrounds the outer circumference of the sleeve wall.

[0010] Preferably, the cross section of the inner baffle is smaller than the cross section of the sleeve cavity.

[0011] Compared with the prior art, the utility model provides a new type of cold extrusion sleeve with the following beneficial effects: 1. An inner baffle is provided inside the improved sleeve, so that construction workers can accurately insert the steel bars into the sleeve, and the baffle ensures the penetration length and ensures that the connection between the two sections of steel bars is located in the center of the sleeve; 2. An extrusion center demarcation mark is provided on the outside of the sleeve, which can provide the extrusion operator with a reliable and accurate extrusion position to avoid extrusion to the demarcation mark. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of an existing sleeve;

[0013] Figure 2 This is a schematic structural diagram of the sleeve of the utility model;

[0014] Figure 3 It is a side view of the sleeve of the utility model;

[0015] Figure 4 This is a side view of the inner baffle involved in the present utility model;

[0016] Figure 5 This is a side view of another embodiment of the inner baffle of the present invention;

[0017] Explanation of the accompanying reference numerals: 1. Steel bar one; 2. Steel bar two; 3. New sleeve; 31. Sleeve wall; 32. Sleeve cavity; 321. Sleeve cavity one; 322. Sleeve cavity two; 33. Inner baffle; 34. Boundary mark; 35. Chamfered surface. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention:

[0019] As described in the background technology, when two sections of steel bars are inserted into the existing cold-extruded sleeve, it is impossible to determine whether the connection point is the midpoint of the sleeve, and there is no center positioning mark on the outside. The utility model improves the sleeve structure and provides a new type of cold-extruded sleeve. The new sleeve 3 includes a sleeve wall 31, and the sleeve wall 31 contains a sleeve cavity 32. For the convenience of description, the length direction of the new sleeve 3 is defined as the horizontal direction, and the radius direction of the sleeve cavity 32 is the longitudinal direction. An inner baffle 33 is provided at the horizontal center of the sleeve cavity 32. The inner baffle 33 divides the sleeve cavity 32 into sleeve cavity 1 321 and sleeve cavity 2 322. Sleeve cavity 1 321 and sleeve cavity 2 322 are mirror-symmetrical relative to the inner baffle 33; the inner baffle 33 is integrally formed with the inner wall of the sleeve wall 31, and the thickness of the inner baffle 33 is generally 3mm-5mm, which does not affect the cold pressing effect; the cross-section of the inner baffle 33 is less than or equal to the cross-section of the sleeve cavity 1 321, and the inner baffle 33 is integrally formed on the inner side of the sleeve wall 31. There are many shapes of inner baffle 33, such as Figure 5The cross section shown is circular, and the outer periphery of the circle is integrally formed with the inner wall of the sleeve wall 31; or Figure 3 The cross section shown is approximately rectangular, and the two sides of the approximately rectangular are arc-shaped integrally formed on the inner wall of the sleeve wall 31; or as shown in FIG. Figure 4 The cross section shown is a concave surface, which reduces the surface area of ​​the inner baffle 33 while ensuring the connection strength; the material of the inner baffle 33 is the same as that of the sleeve wall 31, generally stainless steel. The setting of the inner baffle 33 will form Figure 2 As shown in the effect, the inner baffle 33 is located in the transverse center of the sleeve cavity 32, the steel bar 1 is inserted into the sleeve cavity 1 321, and the steel bar 2 is inserted into the sleeve cavity 2 322. The ends of the steel bars 1 and 2 touch the inner baffle 33, which means they are in place. There is no need to manually mark the steel bars 1 and 2, respectively, and then use a ruler to measure the length of the steel bars entering the sleeve. The inserted steel bars touch the inner baffle 33, which means they are in place. Ensure that the connection between the steel bars 1 and 2 is located in the center of the sleeve cavity 32, avoiding Figure 1 The deviation shown in results in substandard cold extrusion parameters.

[0020] The problem of the steel bar connection being located in the center of the sleeve has been solved. Another problem is that the cold extrusion jack cannot extrude the center of the sleeve, otherwise it will lead to insufficient connection strength, causing rework or even scrapping. Therefore, a demarcation mark 34 is provided on the outside of the sleeve wall 31. The radial axis of symmetry of the demarcation mark 34 is located on the cross section of the center of the sleeve cavity. In this way, the connection between steel bar 1 and steel bar 2 is indicated externally, and construction personnel will avoid extruding the demarcation mark 34, ensuring that the cold extrusion parameters and strength meet the standards. The specific demarcation mark 34 can be a plurality of protrusions arranged at intervals, and the plurality of protrusions are integrally formed on the outside of the sleeve wall 31; or the demarcation mark 34 surrounds the outer periphery of the sleeve wall 31, and the demarcation mark 34 is in the shape of a circular arc chamfer. The height of the demarcation mark 34 perpendicular to the sleeve wall 31 can be 2mm-5mm. In order to save raw materials, chamfered surfaces 35 are provided at both ends of the sleeve wall 31. The chamfered surfaces 35 are inclined from the inner side of the sleeve wall 31 to the outer side of the sleeve wall 31. According to the requirements of cold extrusion construction, the extrusion part of the side should be kept at a certain distance from the end of the sleeve, so the chamfered surface 35 will not be extruded. The chamfered surface 35 saves raw materials without affecting the extrusion effect.

[0021] The sleeve of the present invention changes the traditional sleeve form. The traditional sleeve requires multiple manual measurements to ensure that the steel bars are in place. The judgment of the center position of the sleeve during extrusion is also visual, resulting in unsatisfactory extrusion effect and a large number of defective products, causing a large waste of resources and manpower. The new sleeve 3 does not require multiple manual measurements to achieve the connection of two sections of steel bars in place. The boundary mark 34 on the outside can enable construction personnel to accurately judge the center position of the sleeve to avoid extrusion operations. It is easy to operate, and the extruded finished product passes the tensile test, and the pass rate is significantly improved.

[0022] The above embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A new type of cold extrusion sleeve, characterized by: The invention comprises a novel sleeve (3), which comprises a sleeve wall (31), a sleeve cavity (32) in the sleeve wall (31), an inner baffle (33) provided at the center of the sleeve cavity (32), the inner baffle (33) dividing the sleeve cavity into a sleeve cavity 1 (321) and a sleeve cavity 2 (322), wherein the sleeve cavity 1 (321) and the sleeve cavity 2 (322) are mirror-symmetrical with respect to the inner baffle (33); and a dividing mark (34) is provided on the outer side of the sleeve wall (31), wherein the radial symmetry axis of the dividing mark (34) is located on the central cross section of the sleeve cavity (32).

2. The novel cold extruded sleeve according to claim 1, characterized in that: Both ends of the sleeve wall (31) are provided with chamfered surfaces (35), and the chamfered surfaces (35) are inclined from the inner side of the sleeve wall (31) to the outer side of the sleeve wall (31).

3. The novel cold extruded sleeve according to claim 2, characterized in that: The inner baffle (33) is integrally formed on the inner wall of the sleeve wall (31).

4. The novel cold extruded sleeve according to claim 3, characterized in that: The thickness of the inner baffle (33) is 3mm-5mm.

5. The novel cold extruded sleeve according to claim 4, characterized in that: The boundary marks (34) are a plurality of protrusions arranged at intervals, and the plurality of protrusions are integrally formed on the outer side of the sleeve wall (31).

6. The novel cold extruded sleeve according to claim 4, characterized in that: The boundary mark (34) surrounds the outer periphery of the sleeve wall (31).

7. The novel cold extruded sleeve according to claim 3, characterized in that: The cross section of the inner baffle (33) is smaller than the cross section of the sleeve cavity (321).

Images