Positioning device and use method of cold extrusion equipment in tunnel construction

Abstract

The present invention relates to the field of tunnel construction technology, specifically to a positioning device and method for using cold extrusion equipment in tunnel construction. It includes a jack, the jack is connected to a hydraulic pump, the jack is hoisted on a steel bracket through a walking structure, a crossbeam is provided above the steel bracket, the bottom of both sides of the steel bracket slides along a steel track through casters, and baffles are provided at both ends of the steel track; a gear bar is provided at the upper end of the crossbeam, the walking structure moves along the gear bar, and limit blocks are provided at both ends of the gear bar. The device of the present invention improves the qualified rate of the extrusion sleeve, ensures that the two sections of steel bars are coaxial, and the indentation of the sleeve is uniform after extrusion, and there is no need to manually pry or lift the jack, saving the cost of construction personnel and improving the efficiency of steel bar binding.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, in particular to a positioning device and a use method of cold extrusion equipment in tunnel construction. Background Art

[0002] At present, the domestic tunnel lining steel bar construction has gradually transformed from traditional binding overlap and overlap welding to cold extrusion. The cold extrusion process is novel and has sufficient connection strength. The cold extrusion process first involves the ends of the two sections of steel bars being respectively sleeved in the sleeve, and then the sleeve is aligned with the jack, and finally the hydraulic pump is started to extrude and deform the sleeve, so that the two sections of steel bars are connected in the sleeve with high strength. In the process of aligning the jack with the sleeve, the position of the jack needs to be frequently moved and adjusted, that is, the jack and the sleeve need to be accurately positioned. In the existing technology, it is manually pried with a steel rod or lifted by multiple people. The jack is too heavy and manual movement is difficult. In addition, the positioning after movement is not accurate enough. Prying with the steel rod can easily cause damage to the jack. Therefore, there is an urgent need for a mobile positioning device for the jack that can make the jack easy to move and then align with the sleeve for extrusion. Summary of the Invention

[0003] Problem to be solved: Provide a mobile positioning device for a jack, which does not require manual prying of the jack when the jack is aligned with the sleeve. The positioning device can better achieve alignment between the jack and the sleeve and then squeeze the sleeve.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a positioning device for cold extrusion equipment in tunnel construction, comprising a jack, the jack being connected to a hydraulic pump, the jack being hoisted on a steel support through a walking structure, a crossbeam being provided above the steel support, the bottoms of both sides of the steel support sliding along steel rails through casters, and baffles being provided at both ends of the steel rails; a gear bar being provided at the upper end of the crossbeam, the walking structure moving along the gear bar, and limit blocks being provided at both ends of the gear bar.

[0005] Preferably, the walking structure includes a walking frame and a gear, the gear is located in the walking frame, the walking frame is sleeved on the outside of the crossbeam and the gear is located between the gear bar and the top wall of the walking frame, and the gear is meshed with the gear bar.

[0006] Preferably, a manual turntable is provided on the outside of the traveling frame, and the rotating shaft of the manual turntable passes through the traveling frame and is connected to the gear.

[0007] Preferably, a diagonal brace is provided inside the steel bracket, one end of the diagonal brace is connected to the crossbeam and the other end is connected to a corner of the bottom of the steel bracket.

[0008] Preferably, the jack is suspended on the traveling frame via a steel wire rope, and the length of the extended portion of the steel wire rope is adjustable.

[0009] A method for using a positioning device for cold extrusion equipment in tunnel construction, wherein the method uses the positioning device to produce an indentation on a sleeve connecting two sections of steel bars, comprising the following steps:

[0010] First, determine the construction standards of the sleeve, including the number of indentations (m), the distance (d1) between the center of the outermost indentation and the end of the sleeve, the distance (d2) between the center of the innermost indentation and the centerline of the sleeve, and the center distance (d) between adjacent indentations on the same side of the sleeve centerline. Also determine the parameters involved in the positioning device, such as the radius (R) of the gear and the tooth width (b) on the gear bar.

[0011] 2. The number of teeth n1 that the jack moves across during a movement d1 = d1 / b, and the corresponding angle the gear should rotate is α1 = d1 / (3.14R / 180); the number of teeth n2 that the jack moves across during a movement d = d / b, and the corresponding angle the gear should rotate is α2 = d / (3.14R / 180);

[0012] 3. Press the first indentation on the right end. Align the center of the jack with the end of the sleeve. Then rotate the gear by an angle of α1. At the same time, the number of teeth that the jack has passed is n1. Then lower the jack to start the hydraulic pump.

[0013] Fourth, press the second indentation on the right end. Move the jack based on the position of the first indentation. The gear rotates by an angle of α2. At the same time, the number of teeth that the jack moves is n2. Then lower the jack and start the hydraulic pump to complete the second indentation on the right end. Repeat this step until 0.5m is pressed.

[0014] 5. Press the first indentation on the left end. Align the center of the jack with the end of the sleeve. Then rotate the gear by an angle of α1. When the number of teeth the jack has passed is n1, lower the jack to start the hydraulic pump.

[0015] 6. Make the second indentation at the left end. Move the jack based on the position of the first indentation. The gear rotates by an angle of α2. At the same time, the number of teeth the jack passes is n2. Then lower the jack and start the hydraulic pump to complete the second indentation at the left end. Repeat this step until 0.5m indentation is made.

[0016] Compared with the prior art, the present invention provides a positioning device for cold extrusion equipment in tunnel construction, which has the following beneficial effects: 1. It is more convenient for on-site construction workers to move the jack, and they only need to rotate the manual turntable;

[0017] 2. According to practical verification, the positioning of the jack and sleeve is more accurate by turning the manual turntable, without the need for manual repeated prying and adjustment;

[0018] 3. The positioning device is used to ensure that the extrusion jack can maintain the same height as the steel bar, and the coaxial rate of the steel bar after extrusion is qualified;

[0019] 4. By setting up steel rails, the jack can be moved horizontally when the cold pressing station changes, without the need for manual lifting and transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the device of the present invention;

[0021] Figure 2 It is a side schematic diagram of the device of the present invention;

[0022] Figure 3 A schematic diagram of a sleeve involved in the device of the present invention;

[0023] Figure 4 Schematic diagram of the sleeve involved in the method of the present invention;

[0024] Figure 5 Schematic diagram of the gears and gear bars involved in the method of the present invention;

[0025] Explanation of the accompanying reference numerals: 1. Binding steel bars; 11. Steel bar one; 12. Steel bar two; 13. Sleeve; 131. Indentation; 2. Jack; 3. Steel bracket; 31. Crossbeam; 32. Caster; 33. Diagonal brace; 4. Walking structure; 41. Walking frame; 42. Gear; 6. Manual turntable; 7. Gear bar; 5. Limit block; 8. Steel track; 81. Baffle; 9. Hydraulic pump. DETAILED DESCRIPTION

[0026] 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:

[0027] As shown in the figure, it is a schematic diagram of the positioning device of the cold extrusion equipment in tunnel construction of the present invention, wherein Figure 3In preparation for cold extrusion, the tied steel bars 1 include steel bar 11 and steel bar 2 12. The ends of steel bar 11 and steel bar 2 12 that are close to each other are relatively sleeved in the sleeve 13. Cold extrusion equipment is needed to extrude the sleeve 13 to complete the tight connection between steel bar 11, steel bar 2 12 and sleeve 13. Since steel bar 11 and steel bar 2 12 are long and inconvenient to move, the cold extrusion equipment can only be moved to make them accurately aligned with the sleeve 13. The positioning device of the present invention includes a jack 2, which is connected to a hydraulic pump 9. The hydraulic pump 9 controls whether the jack 2 is working. The jack 2 is hoisted on a steel support 3 through a walking structure 4. A crossbeam 31 is provided above the steel support 3. Casters 32 are provided at the bottom of both sides of the steel support 3. The casters 32 slide along a steel track 8. Baffles 81 are provided at both ends of the steel track 8. The baffles 81 at both ends limit the displacement range of the steel support 3. A gear bar 7 is provided at the upper end of the crossbeam 31. Limit blocks 5 are provided at both ends of the gear bar 7. The two limit blocks 5 limit the displacement range of the walking structure 4 on the crossbeam 31. The walking structure 4 includes a walking frame 41 and a gear 42. The gear 42 is located in the walking frame 41. The walking frame 41 is sleeved on the outside of the crossbeam 31 and the gear 42 is located between the gear bar 7 and the top wall of the walking frame 41. The gear 42 is meshed with the gear bar 7. When the gear 42 moves along the gear bar 7, it drives the walking structure 4 to move along the gear bar 7, so that the walking structure 4 moves forward or backward relative to the gear bar 7. In order to make it easier to rotate the gear 42, a manual turntable 6 is provided on the outside of the walking frame 41. The shaft of the manual turntable 6 passes through the walking frame 41 and is connected to the axis of the gear 42. In this way, when the construction worker rotates the manual turntable 6, the gear 42 also rotates in the same direction as the manual turntable 6. The gear 42 meshes along the gear bar 7. Since the gear 42 meshes with the gear bar 7, one rotation of the gear 42 can be converted into a specific amount of horizontal displacement of the walking structure 4. This allows the jack 2 to be accurately moved in the horizontal direction by rotating the manual turntable 6. Since the jack 2 weighs hundreds of pounds, in order to make the steel bracket 3 support the jack 2 more stably, a diagonal brace 33 is provided inside the steel bracket 3. One end of the diagonal brace 33 is connected to the crossbeam 31 and the other end is connected to a corner of the bottom of the steel bracket 3. This fully utilizes the stability of the triangle to make the entire positioning device more secure. The jack 2 can be suspended on the traveling frame 41 by a steel wire rope, the length of the extended part of the steel wire rope is adjustable, one end of the steel wire rope is fixed to the top of the traveling frame 41, and the other end is movably connected to the traveling frame 41. The movable connection method can be that the steel wire rope is tied to a fixed column extending from the traveling frame 41 to adjust the height of the jack 2.

[0028] After calculation, the above device can ensure the accuracy of the movement of the jack 2. The length of the sleeve 13 is L. According to the construction requirements, we need to press out the following on the sleeve 13: Figure 4The indentation 131 shown is set to m. In this embodiment, m is 6. The indentations 131 are symmetrically distributed on both sides of the center line of the sleeve 13. The center distance between two adjacent indentations 131 on the same side of the center line of the sleeve 13 is d. The center of the outermost indentation 131 should be kept at a certain distance from the end of the sleeve 13. Generally, this distance is d1. The distance between the indentation 131 close to the center line of the sleeve 13 and the center line is d2. Figure 5As shown, a gear 42 with a radius R of 25 mm is selected, and the tooth width on the gear bar 7 is b, which is 3 mm. When the gear 42 rotates at an angle α, the distance the gear 42 and the gear bar 7 mesh with each other is the arc length L1. That is, the arc length L1 corresponds to the displacement of the jack 2, which is also L1. Since the distance between the two indentations 131 is d, the displacement of the jack 2 between the two indentations 131 is d. Therefore, the number of teeth that the gear 42 needs to travel is d / b. From this, we can determine the distance by counting the number of teeth. To determine the displacement of the jack 2, a lateral displacement scale is set on the walking structure 4 to determine the displacement of the jack 2 driven by the gear 42; another way is to determine the displacement of the jack 2 according to the rotation angle of the gear 42. The displacement of the jack 2 is d, which is converted to the arc length on the gear 42, d=L1=3.14αR / 180, α=d / (3.14R / 180). An angle mark is set on the walking structure 4 to judge the rotation angle of the gear 42 and determine the displacement of the jack 2 in turn. For example, in the construction standard, the length L of the sleeve 13 is 140 mm, the center distance d between the two indentations 131 is 20 mm, the center of the outermost indentation 131 should be 15 mm away from the end of the sleeve 13 at a distance d1, and the distance d2 from the center line of the indentation 131 close to the center line of the sleeve 13 is 15 mm. That is to say, to make the first indentation starting from the right side of the sleeve 13, it is necessary to move 15 mm to the left from the right end of the sleeve 13. At this time, the number of teeth n1 = d1 / b = 15 / 3 = 5. When making the first indentation, just move the gear 42 by five teeth. The angle of rotation of the gear 42 is α1 = d1 / (3.14R / 180) = 15÷(3.14×25÷180)≈34°. The accuracy of the displacement is ensured by the two scales of angle and length.When starting to press the second indentation 131 on the right end, the displacement of the jack 2 is d=20mm. At this time, the number of teeth n2=d / b=20 / 3≈6.7, α2=d / (3.14R / 180)=20÷(3.14×25÷180)≈45°, and the gear 42 can be rotated by the corresponding angle; when pressing the third indentation 131, the displacement is the same as the second; then press the other three indentations, the center of the jack 2 is aligned with the left end of the sleeve 13, and when pressing the first indentation 131 on the left, the jack 2 moves 15mm to the right from the left end of the sleeve 13, the number of teeth n1=d1 / b=15 / 3=5, and when pressing the first indentation on the left, the gear 42 can be moved five teeth. The angle α1 of the gear 42 is d1 / (3.14R / 180)=15÷(3.14×25÷180)≈34°; when pressing the second indentation 131 on the left end, the displacement of the jack 2 is d=20mm, at this time the number of teeth n2=d / b=20 / 3≈6.7, α2=d / (3.14R / 180)=20÷(3.14×25÷180)≈45°, and the gear 42 can be rotated by the corresponding angle; when pressing the third indentation 131 on the left end, the displacement is the same as the second one; from the above process, it can be seen that the length of the sleeve 13 is L=2d1+4d+2d2=2×15+4x20+2×d2=140, d2=15, which meets the requirement that the distance between the indentation 131 close to the center line of the sleeve 13 and the center line is 15mm, and the relationship between L and m is satisfied.

[0029] L=2d1+2d2+(m-2)d can verify whether d2 meets the construction requirements.

[0030] During use, a steel track 8 is laid at a suitable position in the extrusion station, and a steel bracket 3 is installed on the steel track 8 to ensure that the caster 32 can slide along the steel track 8. The walking frame 41 is sleeved on the crossbeam 31, and the two ends of the crossbeam 31 are fixed to the two sides of the steel bracket 3. The jack 2 is connected to the walking frame 41, and the ends of the steel bar 11 and the steel bar 2 12 are sleeved in the sleeve 13 and ready. The construction personnel rotate the manual turntable 6 to move the center of the jack 2 to the first indentation 131 position. At this time, the manual turntable 6 is stopped, the steel wire rope on the jack 2 is loosened, and the jack 2 is placed downward so that the center of the jack 2 coincides with the center of the first indentation 131, and the hydraulic pump 9 is started. Then, the manual turntable 6 is rotated according to the calculated number of rotating teeth to perform subsequent indentation 131 operations. The device of the present invention improves the qualified rate of the extrusion sleeve, ensures that the steel bar 11 and the steel bar 2 12 are coaxial, and the sleeve 13 is uniformly indented after extrusion. There is no need to manually pry or lift the jack, saving construction personnel costs and improving the efficiency of steel bar binding.

[0031] The above embodiments are only some 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 making creative work are within the scope of protection of the present invention.

Claims

1. A method for using a positioning device for cold extrusion equipment in tunnel construction, comprising a jack (2), the jack (2) being connected to a hydraulic pump (9), characterized in that: The jack (2) is hoisted on the steel support (3) through the walking structure (4). A crossbeam (31) is provided above the steel support (3). The bottoms of both sides of the steel support (3) slide along the steel track (8) through casters (32). Both ends of the steel track (8) are provided with baffles (81). A gear bar (7) is provided at the upper end of the crossbeam (31). The walking structure (4) moves along the gear bar (7). Both ends of the gear bar (7) are provided with limit blocks (5). The walking structure (4) includes a walking frame (41) and a gear (42), the gear (42) is located in the walking frame (41), the walking frame (41) is sleeved on the outside of the crossbeam (31), and the gear (42) is located between the gear bar (7) and the top wall of the walking frame (41), and the gear (42) is meshed with the gear bar (7); A manual turntable (6) is provided on the outside of the traveling frame (41), and a rotating shaft of the manual turntable (6) passes through the traveling frame (41) and is connected to the gear (42); The jack (2) is suspended on the traveling frame (41) via a steel wire rope, and the length of the extended portion of the steel wire rope is adjustable; The device is used to produce an indentation (131) on a sleeve (13) connecting two sections of steel bars, and is characterized in that it comprises the following steps: First, determine the construction standard of the sleeve (13), which includes the number m of indentations (131), the distance d1 between the center of the outermost indentation (131) and the end of the sleeve (13), the distance d2 between the center of the innermost indentation (131) and the center line of the sleeve (13), and the center distance d between adjacent indentations (131) on the same side of the center line of the sleeve (13); determine the parameters involved in the positioning device, the radius R of the gear (42), and the tooth width b on the gear bar (7); 2. The number of teeth n1=d1 / b that the jack (2) moves through when it moves d1 corresponds to the angle α1=d1 / (3.14R / 180) that the gear (42) should rotate. The number of teeth n2=d / b that the jack (2) moves when it moves d corresponds to the angle α2=d / (3.14R / 180) that the gear (42) should rotate.

3. Press the first indentation (131) at the right end, align the center of the jack (2) with the end of the sleeve (13), then rotate the gear (42) by an angle α1, and the number of teeth that the jack (2) has traveled is n1. Then, lower the jack (2) and start the hydraulic pump (9); 4. Press the second indentation (131) at the right end, move the jack (2) based on the position of the first indentation (131), and the gear (42) rotates by an angle α2. At the same time, the number of teeth that the jack (2) passes is n2. Then, lower the jack (2) and start the hydraulic pump (9) to complete the second indentation (131) at the right end. Repeat this step until 0.5m of indentations are pressed.

5. Press the first indentation (131) at the left end, align the center of the jack (2) with the end of the sleeve (13), then rotate the gear (42) by an angle α1, and at the same time, the number of teeth that the jack (2) has passed is n1, then lower the jack (2) and start the hydraulic pump (9); 6. Press the second indentation (131) at the left end. Move the jack (2) based on the position of the first indentation (131). The gear (42) rotates by an angle α2. At the same time, the number of teeth that the jack (2) passes is n2. Then lower the jack (2) and start the hydraulic pump (9) to complete the second indentation (131) at the left end. Repeat this step until 0.5m is pressed.

2. The method for using the positioning device of cold extrusion equipment in tunnel construction according to claim 1, characterized in that: An oblique brace (33) is provided inside the steel bracket (3), one end of the oblique brace (33) is connected to the crossbeam (31) and the other end is connected to a corner of the bottom of the steel bracket (3).

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