Method for increasing grouting hole of shield tunnel segment

Abstract

The application provides a method for increasing a grouting hole of a shield tunnel segment, which comprises the following steps: S1, segment positioning; S2, on-site positioning; S3, hole opening; S4, grouting; S5, grouting sleeve implantation; and S6, cleaning of the anchoring adhesive. The method for increasing the grouting hole of the shield tunnel segment can realize on-site hole opening before the installation of the tunnel segment, and can effectively solve the problem of the lack of the grouting hole of the segment or the problem that the grouting hole is not located at a specific position.

Description

Technical Field

[0001] This invention relates to the field of shield tunnel engineering, and in particular to a method for adding grouting holes to shield tunnel segments. Background Technology

[0002] Currently, shield tunneling is widely used in urban rail transit construction projects due to its safety, environmental friendliness, and speed. In shield tunneling, the shield segments, as the main structure of the tunnel, are prefabricated. However, during tunneling, situations may arise where the location or number of grouting holes in the shield segments does not meet site requirements. If additional holes are easily added, problems arise such as removing the reinforcing steel in the newly opened holes, the inability of the assembly machine to use the segment for assembly, and excessive hole depth (making sealing difficult after grouting). Therefore, there is an urgent need to develop a method suitable for adding grouting holes in the segments to solve problems encountered on site. Summary of the Invention

[0003] The main objective of this invention is to provide a method for adding grouting holes to shield tunnel segments, thereby solving the problems of removing steel reinforcement from newly opened segments, the inability of the assembly machine to use the segments for assembly operations, and excessively deep hole depths.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for increasing the number of grouting holes in shield tunnel segments, the method comprising:

[0005] S1. Segment positioning: Before drilling, determine the location of the additional grouting holes on the drawings.

[0006] S2. On-site positioning: Place the segment to be perforated horizontally with the inner arc facing upwards. Then, according to the points on the drawing, lay out the actual position on the segment and mark it.

[0007] S3. Drill holes according to the marked positions until the preset depth is reached, and clean the inside of the hole to ensure it is dry and clean.

[0008] S4. Grouting: Inject anchoring adhesive into the hole and apply anchoring adhesive to the outside of the grouting sleeve.

[0009] S5. Insert the grouting sleeve into the hole until the anchoring adhesive comes out.

[0010] S6. Clean up the anchoring adhesive. Finally, clean up any anchoring adhesive that has seeped out of the hole.

[0011] In the preferred embodiment, the positioning in step S1 needs to be combined with the segment type, segment reinforcement diagram, and the location of existing grouting holes and bolt holes of the segment. It needs to avoid the location of segment reinforcement and vacuum suction cup. The segment is either an adjacent block segment or a standard block segment.

[0012] In the preferred embodiment, the specific on-site positioning method in step S2 is as follows: the front side of the tunnel segment excavation direction is designated as face A, the left side as face B, the right side as face D, and the rear side as face C; and the distance from face A to the center of the grouting hole is defined as a, from face B to the center of the grouting hole as b, from face D to the center of the grouting hole as d, and from face C to the center of the grouting hole as c; first, the distance from face A to the center of the grouting hole is determined, i.e., after a is determined correctly, the distances b, c, and d are determined in sequence and verified against each other. After all four distances conform to the drawings, the positioning is completed.

[0013] In the preferred embodiment, the specific hole-opening method in step S3 is as follows: When starting drilling, first tilt the drill rig, turn it on and off intermittently, and use the inertia of the drill bit to grind the segment when the power is off. After grinding out a crescent-shaped groove, slowly straighten the drill bit until it is completely ground into a circle. After it is completely ground into a circle, turn on the switch and apply force downward. When pressing down, use the force applied by the shoulder to the shoulder support on the water drill. Drilling is carried out in two stages. First, drill from the inner arc surface of the segment downward to the depth of the inner arc surface of the segment to the surface of the inner layer of segment steel reinforcement. Then lift the drill rod and observe the hole to see if there is any steel reinforcement interference in the drilling path. If there is interference, make adjustments to avoid the steel reinforcement. After the adjustment is completed, carry out the second stage of drilling to the preset depth. The hole-opening and cutting drill bit is a drill bit with a diameter greater than the grouting sleeve by 1cm, and the hole depth is greater than the length of the grouting sleeve by 1cm.

[0014] In a preferred embodiment, the length of the grouting sleeve is less than the thickness of the segment. Before grouting behind the segment wall, a tool is used to penetrate the segment into the grouting sleeve, and then grouting is performed using a grouting pipe.

[0015] In the preferred embodiment, the grouting sleeve consists of a pre-embedded pipe, an extension pipe, and a spiral cap. The diameter of the pre-embedded pipe is larger than that of the extension pipe, and the connection between the pre-embedded pipe and the extension pipe is made by threaded connection. The spiral cap is threaded through the pre-embedded pipe, and a check valve extending into the extension pipe is provided at the end of the spiral cap. Threaded teeth are provided on the outer wall surfaces of both the pre-embedded pipe and the extension pipe. A sealing rubber ring is also provided at the connection between the pre-embedded pipe and the extension pipe.

[0016] In the preferred embodiment, step S3 uses a dust removal device to clean the inside of the hole. The dust removal device includes an outer sleeve and a telescopic dust removal component that is telescopically disposed in the outer sleeve. The dust removal component cleans the inside of the hole by telescopically extending and retracting the outer sleeve within the outer sleeve.

[0017] In a preferred embodiment, the outer sleeve is a hollow cylinder with open ends, and a number of evenly distributed expansion grooves are evenly arranged on the wall surface of the outer sleeve.

[0018] The telescopic dust removal assembly includes a bottom ring movably disposed in the outer sleeve, a connecting block disposed on the outer wall of the bottom ring and passing through the corresponding telescopic groove, an outer ring fixed at the other end of the connecting block, a cleaning brush disposed on the outer wall of the outer ring, several uprights disposed on the top of the bottom ring, a top plate fixed on the top of the uprights, and a tension handle disposed on the top of the top plate.

[0019] In a preferred embodiment, a non-powered fan is provided in the bottom ring. The non-powered fan includes a rotating shaft seat and rotating fan blades that are rotatably mounted on the rotating shaft seat. Several connecting rods connected to the inner wall of the bottom ring are provided on the outside of the rotating shaft seat, and a central rod connected to the bottom of the top plate is provided on the top of the rotating shaft seat.

[0020] In a preferred embodiment, the side wall of the rotating shaft seat is provided with a hook-shaped groove, and a ratchet assembly is provided in the hook-shaped groove. The inner wall of the rotating fan blade is provided with a one-way toothed groove that matches the ratchet assembly, so that the non-powered fan can only rotate when the telescopic dust removal assembly is lifted.

[0021] The ratchet assembly includes an abutment plate rotatably disposed in a hook groove, and an abutment spring disposed in the hook groove and in contact with the inside of the abutment plate.

[0022] This invention provides a method for adding grouting holes to shield tunnel segments. The method allows for on-site drilling of the tunnel segments before installation, effectively solving the problem of missing or misplaced grouting holes. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 This is a top view of the added grouting hole structure of the standard block segment of the present invention;

[0025] Figure 2 This is a diagram showing the location of the additional grouting holes for the standard block segment of this invention;

[0026] Figure 3 This is a positioning diagram of the additional grouting holes for adjacent block segments of the present invention;

[0027] Figure 4 This is a side view of the added grouting holes in the standard block segment of the present invention;

[0028] Figure 5 This is a structural diagram of the grouting sleeve of the present invention;

[0029] Figure 6 This is a cross-sectional view of the grouting sleeve structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the invention involving the addition of grouting holes for injecting rebar adhesive;

[0031] Figure 8 This is a structural diagram of the grouting sleeve implantation of the present invention;

[0032] Figure 9 This is a structural diagram of the dust removal device of the present invention;

[0033] Figure 10 This is an exploded view of the structure of the dust removal device of the present invention;

[0034] Figure 11 This is a structural diagram of the outer sleeve of the present invention;

[0035] Figure 12 This is a structural diagram of the telescopic dust removal component of the present invention;

[0036] Figure 13 This is a structural diagram of the non-powered fan ratchet assembly of the present invention;

[0037] In the diagram: 1. Segment 1; 101. Grouting hole 2; 3. Grouting sleeve 3; 301. Embedded pipe 302; 303. Check valve 303; 304. Threaded wire 305; 305. Rebar adhesive 4; 5. Dust removal device 5; 51. Outer sleeve 512; 52. Telescopic dust removal assembly 52; 521. Bottom ring 522; 522. Outer ring 523; 524. Cleaning brush 525; 525. Non-powered fan 525; Rotary shaft seat 5251; Rotary fan blade 5252; Hook groove 5253; Contact plate 5254; Contact spring 5255; Connecting rod 526; Center rod 527; Upright 528; Top plate 529; Tension handle 530. Detailed Implementation

[0038] Example 1

[0039] like Figure 1-8 As shown, a method for increasing the number of grouting holes in shield tunnel segments includes:

[0040] S1, Segment 1 location: Before drilling, based on the segment model, segment reinforcement diagram, and the location of existing grouting holes and bolt holes in the segment, first determine the location of the additional grouting hole 2 on the CAD drawing. It is necessary to avoid the location of segment reinforcement 101 and vacuum suction cup. Segment 1 is one of the adjacent block segment and standard block segment.

[0041] S2. On-site positioning: Place the pipe segment 1 to be perforated horizontally with the inner arc facing upward. Then, according to the points on the drawing, lay out the actual position on the pipe segment 1 and mark it.

[0042] S3. Drill holes according to the marked positions until the preset depth is reached, and clean the inside of the hole to ensure it is dry and clean.

[0043] S4. Grouting: Inject anchoring adhesive 4 into the hole and apply anchoring adhesive 4 to the outside of the grouting sleeve 3.

[0044] S5. Insert the grouting sleeve 3 into the hole until the anchoring adhesive 4 emerges. The anchoring adhesive 4 is used to solidify the insertion of the grouting sleeve 3.

[0045] S6. Clean up the anchoring adhesive 4. Finally, clean up the anchoring adhesive 4 that has come out of the hole.

[0046] When in use, the length of the grouting sleeve 3 is less than the thickness of the segment 1. Before grouting construction behind the wall of the segment 1, a tool is used to penetrate the grouting sleeve 3 to puncture the segment 1. After puncturing, grouting is performed using the grouting pipe.

[0047] In the preferred embodiment, the specific on-site positioning method in step S2 is as follows: the front side of the tunnel segment 1 in the tunneling direction is designated as face A, the left side as face B, the right side as face D, and the rear side as face C; and the distance from face A to the center of the opening point is defined as a, from face B to the center of the opening point as b, from face D to the center of the opening point as d, and from face C to the center of the opening point as c; first, the distance from face A to the center point of the additional grouting hole 2 is determined, that is, after a is determined correctly, the distances b, c, and d are determined in sequence and verified against each other. After all four distances are consistent with the drawings, the positioning is completed.

[0048] In the preferred embodiment, the specific hole-opening method in step S3 is as follows: When starting drilling, first tilt the drill rig, turn it on and off intermittently, and use the inertia of the drill bit to grind the pipe segment when the power is off. After grinding out a crescent-shaped groove, slowly straighten the drill bit until it is completely ground into a circle. After it is completely ground into a circle, turn on the switch and apply force downward. When pressing down, use the force applied by the shoulder to the shoulder support on the water drill. Drilling is carried out in two stages. First, drill from the inner arc surface of the pipe segment 1 down to the depth of the inner layer of pipe segment steel bar 101. Then lift the drill rod and observe the hole to see if there is any steel bar interference in the drilling path. If there is interference, make adjustments to avoid the steel bar. After the adjustment is completed, carry out the second stage of drilling to the preset depth. Among them, the hole-opening and cutting drill bit adopts a drill bit with a diameter greater than 31cm of the grouting sleeve and a drilling depth greater than 1cm of the length of the grouting sleeve 3.

[0049] In the preferred embodiment, the grouting sleeve 3 is composed of a pre-embedded pipe 301, an extension pipe 302, and a spiral cap 305. The diameter of the pre-embedded pipe 301 is larger than the diameter of the extension pipe 302, and the connection end of the pre-embedded pipe 301 and the extension pipe 302 is connected by a thread. The spiral cap 305 is threaded through the pre-embedded pipe 301, and a check valve 303 extending into the extension pipe 302 is provided at the end of the spiral cap 305. The outer wall surfaces of the pre-embedded pipe 301 and the extension pipe 302 are both provided with integrally formed threaded wires 304.

[0050] During use, the grouting pipe achieves the grouting effect by passing through the pre-embedded pipe 301 and the extension pipe 302. After grouting is completed, the screw cap 305 is screwed on. The check valve 303 can prevent the backflow of grout. In addition, the outer wall surfaces of the pre-embedded pipe 301 and the extension pipe 302 are provided with threaded wires 304, which can increase the fit with the anchoring adhesive 4, thereby improving the stability of the grouting sleeve 3 implantation.

[0051] A sealing rubber ring is also provided at the connection between the pre-embedded pipe 301 and the extension pipe 302 to prevent water seepage.

[0052] Example 2

[0053] Further explanation in conjunction with Example 1, such as Figure 9-13 As shown in the structure, in order to quickly meet the requirements of drying and cleaning inside the hole, the cleaning device 5 is used to clean the inside of the hole in step S3. The cleaning device 5 includes an outer sleeve 51 and a telescopic cleaning component 52 that is telescopically disposed in the outer sleeve 51. The inside of the hole is cleaned by the telescopic cleaning component 52 extending and retracting within the outer sleeve 51.

[0054] In the preferred embodiment, the outer sleeve 51 is a hollow cylinder with open ends, and a plurality of evenly distributed expansion grooves 512 are evenly provided on the wall surface of the outer sleeve 51. In this embodiment, the number of expansion grooves 512 is five.

[0055] The telescopic cleaning assembly 52 includes a bottom ring 521 movably disposed in the outer sleeve 51, five connecting blocks 522 disposed on the outer wall of the bottom ring 521 and passing through the corresponding telescopic groove 512, an outer ring 523 fixed at the other end of the connecting block 522, a cleaning brush 524 disposed on the outer wall of the outer ring 523, several uprights 528 fixed on the top of the bottom ring 521, a top plate 529 fixed on the top of the uprights 528, and a tension handle 530 disposed on the top of the top plate 529. The outer diameter of the cleaning brush 524 is slightly larger than the diameter of the additional grouting hole 2, and the length of the outer sleeve 51 is greater than the length of the additional grouting hole 2.

[0056] When in use, insert the outer sleeve 51 into the additional grouting hole 2, and control the tension handle 530 to make the telescopic cleaning component 52 move like a piston in the additional grouting hole 2, thereby achieving the cleaning effect through the contact between the cleaning brush 524 and the hole wall.

[0057] In a preferred embodiment, a non-powered fan 525 is provided in the bottom ring 521. The non-powered fan 525 includes a rotating shaft seat 5251 and rotating fan blades 5252 rotatably mounted on the rotating shaft seat 5251. Several connecting rods 526 are fixedly connected to the inner wall of the bottom ring 521 on the outside of the rotating shaft seat 5251. In this embodiment, there are five connecting rods 526 to achieve the effect of fixing the non-powered fan 525. A central rod 527 connected to the bottom of the top plate 529 is fixedly provided on the top of the rotating shaft seat 5251 to improve the overall stability.

[0058] When in use, the non-powered fan 525 rotates through the piston movement of the telescopic dust removal assembly 52, thereby improving the effect of discharging dust from the hole while cleaning.

[0059] In a preferred embodiment, the side wall of the rotating shaft seat 5251 is provided with a hook-shaped groove 5253, and a ratchet assembly is provided in the hook-shaped groove 5253. The inner wall of the rotating fan blade 5252 is provided with a one-way toothed groove 5256 that matches the ratchet assembly, so that the non-powered fan 525 can only rotate when the telescopic dust removal assembly 52 is lifted.

[0060] The ratchet assembly includes an abutment plate 5254 rotatably disposed in a hook groove 5253, and an abutment spring 5255 fixed in the hook groove 5253 and in contact with the inner side of the abutment plate 5254. The abutment plate 5254 is rotatably connected to the inner wall of the hook groove 5253 via a rotating shaft.

[0061] During use, the contact plate 5254 and the one-way toothed groove 5256 cooperate to make the non-powered fan 525 rotate only in one direction. That is, when the telescopic dust removal component 52 is lifted, the non-powered fan 525 is locked when the telescopic dust removal component 52 is pressed down. This can increase the pressure when pressing down and make the dust be discharged quickly. When lifting, the rotation of the non-powered fan 525 increases the flow rate, allowing the air to enter the hole faster, thus making the lifting smoother and increasing the pressure of the next press down. At the same time, it improves the stability of the non-powered fan 525.

[0062] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for increasing the number of grouting holes in shield tunnel segments, characterized by: The method includes: S1, the location of the segment (1) is determined on the drawing before the hole is opened; S2. On-site positioning: Place the pipe segment (1) to be drilled horizontally with the inner arc facing upward. Then, according to the points on the drawing, lay out the actual position on the pipe segment (1) and mark it. The specific on-site positioning method is as follows: take the front side of the pipe segment (1) in the tunneling direction as face A, the left side as face B, the right side as face D, and the rear side as face C; and set the distance from face A to the center of the hole opening as a, face B to the center of the hole opening as b, face D to the center of the hole opening as d, and face C to the center of the hole opening as c; first, determine the distance from face A to the center of the grouting hole (2). After a is determined correctly, determine the distances of b, c and d in sequence and verify them against each other. After all four distances are consistent with the drawing, the positioning is completed. S3. Drilling: Drill holes according to the marked positions until the preset depth is reached, and clean the holes to ensure that the holes are dry and clean. Specifically, a cleaning device (5) is used to clean the holes. The cleaning device (5) includes an outer sleeve (51) and a telescopic cleaning component (52) that is telescopically installed in the outer sleeve (51). The holes are cleaned by telescopically extending and retracting the telescopic cleaning component (52) in the outer sleeve (51). The outer sleeve (51) is a hollow cylinder with open ends, and a number of evenly distributed expansion grooves (512) are evenly arranged on the wall surface of the outer sleeve (51). The telescopic dust removal assembly (52) includes a bottom ring (521) movably disposed in the outer sleeve (51), a connecting block (522) disposed on the outer wall of the bottom ring (521) and passing through the corresponding telescopic groove (512), an outer ring (523) fixed at the other end of the connecting block (522), a cleaning brush (524) disposed on the outer wall of the outer ring (523), a number of uprights (528) disposed on the top of the bottom ring (521), a top plate (529) fixed on the top of the uprights (528), and a tension handle (530) disposed on the top of the top plate (529). The bottom ring (521) is provided with a non-powered fan (525). The non-powered fan (525) includes a rotating shaft seat (5251) and a rotating fan blade (5252) rotatably mounted on the rotating shaft seat (5251). The outside of the rotating shaft seat (5251) is provided with several connecting rods (526) connected to the inner wall of the bottom ring (521). The top of the rotating shaft seat (5251) is provided with a central rod (527) connected to the bottom of the top plate (529). S4. Grouting: Inject the anchoring adhesive (4) into the hole and apply the anchoring adhesive (4) to the outside of the grouting sleeve (3). S5. Insert the grouting sleeve (3). Insert the grouting sleeve (3) into the hole until the anchoring adhesive (4) emerges. The grouting sleeve (3) consists of a pre-embedded pipe (301), an extension pipe (302), and a spiral cap (305). The diameter of the pre-embedded pipe (301) is larger than the diameter of the extension pipe (302). The connection between the pre-embedded pipe (301) and the extension pipe (302) is made by threaded connection. The spiral cap (305) is threaded through the pre-embedded pipe (301). The end of the spiral cap (305) is provided with a check valve (303) extending into the extension pipe (302). The outer wall surfaces of the pre-embedded pipe (301) and the extension pipe (302) are provided with threaded wires (304). A sealing rubber ring is also provided at the connection between the pre-embedded pipe (301) and the extension pipe (302). S6. Clean up the anchoring adhesive (4). Finally, clean up the anchoring adhesive (4) that has come out of the hole.

2. The method for increasing grouting holes in shield tunnel segments according to claim 1, characterized in that: The positioning in step S1 needs to be combined with the segment type, segment reinforcement diagram, and the location of existing grouting holes and bolt holes of the segment. It needs to avoid the location of the segment reinforcement (101) and vacuum suction cup. The segment (1) is one of the adjacent block segment and standard block segment.

3. The method for increasing grouting holes in shield tunnel segments according to claim 1, characterized in that: The specific hole-opening method in step S3 is as follows: When starting to drill, tilt the drill rig first, turn it on and off intermittently, and use the inertia of the drill bit to grind the pipe segment when the power is off. After grinding out the crescent-shaped groove, slowly straighten the drill bit until it is completely ground into a circle. After it is completely ground into a circle, turn on the switch and apply force to press down. When pressing down, use the force of the shoulder on the water drill to perform the action. Drilling is carried out in two stages. First, drill down from the inner arc surface of the pipe segment (1) to the depth of the inner arc surface of the pipe segment (1) to the upper surface of the inner layer pipe segment steel bar (101). Then lift the drill rod and observe the hole. Observe whether there is steel bar interference in the drilling path. If there is interference, make adjustments to avoid the steel bar. After the adjustment is completed, carry out the second stage of drilling operation and drill to the preset depth. Among them, the hole-opening and cutting drill bit adopts a drill bit with a diameter greater than 1cm of the grouting sleeve (3) and the drilling depth is greater than 1cm of the length of the grouting sleeve (3).

4. The method for increasing grouting holes in shield tunnel segments according to claim 1, characterized in that: The length of the grouting sleeve (3) is less than the thickness of the segment (1). Before grouting the segment (1) behind the wall, a tool is used to penetrate the grouting sleeve (3) to puncture the segment (1). After puncturing, grouting is performed using a grouting pipe.

5. The method for increasing grouting holes in shield tunnel segments according to claim 1, characterized in that: The rotating shaft seat (5251) has a hook-shaped groove (5253) on its side wall, and a ratchet assembly is provided in the hook-shaped groove (5253). The inner wall of the rotating fan blade (5252) has a one-way toothed groove (5256) that matches the ratchet assembly, so that the non-powered fan (525) can only rotate when the telescopic dust removal assembly (52) is lifted. The ratchet assembly includes an abutment plate (5254) rotatably disposed in a hook groove (5253) and an abutment spring (5255) disposed in the hook groove (5253) and in contact with the inside of the abutment plate (5254).

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