A construction method for reinforcing a shield tunnel segment joint structure

Abstract

The present invention relates to a construction method of a shield tunnel segment joint reinforcement structure, the shield tunnel segment joint reinforcement structure comprises a long steel buckle, a winch, and a perforated anchor rod; the long steel buckle is fixed on the normal joint or damaged joint of the damaged ring of the shield tunnel, and the long steel buckle is connected to the winch through a steel cable with an axial force gauge; the perforated anchor rod is connected to the long steel buckle fixed on the damaged joint through an arc buckle plate, and cement mortar is injected into the soil through the perforated anchor rod; the construction steps include: preparation of materials and equipment before construction, equipment fixing, site cleaning, on-site construction, and site cleaning. The advantages of the shield tunnel segment joint reinforcement structure of the present invention include: it is specifically targeted at the construction of shield tunnel segment joint reinforcement, the construction equipment is simple, and the reinforcement effect is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of tunnel reinforcement, and in particular relates to a construction method for a shield tunnel segment joint reinforcement structure. Background Art

[0002] Nowadays, many cities in my country have built subways. Most of these subways use circular shield tunnels. Each ring of the shield tunnel is composed of several segments. The joints between the segments are the weak points of the project. Although there are many reinforcement structures and construction methods for shield tunnels, there are few structures and construction methods specifically for reinforcing the joints of shield tunnel segments.

[0003] Therefore, it is necessary to continuously invent and improve the reinforcement structure and construction methods of existing shield tunnels. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a construction method for a shield tunnel segment joint reinforcement structure.

[0005] This construction method of the shield tunnel segment joint reinforcement structure is characterized in that the shield tunnel segment joint reinforcement structure includes a long steel buckle, a winch, and a perforated anchor rod; the long steel buckle is fixed on the normal joint or damaged joint of the damaged ring of the shield tunnel, and the long steel buckle is connected to the winch through a steel cable with an axial force gauge; the perforated anchor rod is connected to the long steel buckle fixed on the damaged joint through an arc buckle plate, and cement mortar is injected into the soil through the perforated anchor rod; the arc buckle plate is arc-shaped and can fit tightly with the damaged joint on the damaged ring of the tunnel.

[0006] The construction steps include:

[0007] S1. Preparation before construction: According to the severity of the damaged joints on site and the number of segments in the damaged ring, determine the size and quantity of the long steel buckles and steel cables to be used, the power of the winch, the specifications of the arc buckle plate and the anchor rod with holes; transport the equipment and materials to the construction site;

[0008] S2. Fixing equipment: Set up the winch on site; make grooves on the normal joints and damaged joints of the damaged ring of the tunnel according to the size of the long steel buckle, then insert the long steel buckle into the soil, and then rotate the long steel buckle 90° so that the long steel buckle horizontally buckles the segments on the left and right sides of the normal joint and the damaged joint; finally, connect the long steel buckle to the winch through a steel cable with an axial force gauge;

[0009] S3, on-site construction: holes are drilled on the segments on both sides of the damaged joint; the winch is started to restore the damaged joint to the state of a normal joint; a perforated anchor rod is driven through the holes on the segments on both sides of the damaged joint, and then cement mortar is injected into the soil through the perforated anchor rod; finally, after a period of curing, the perforated anchor rod is connected to the long steel buckle fixed on the damaged joint through the arc buckle plate;

[0010] S4. Site cleaning: fill the grooves at normal joints, retrieve the steel cables and winches, tidy up the site, and remove the equipment.

[0011] The special features and beneficial effects of the present invention are:

[0012] 1. The shield tunnel segment joint reinforcement structure of the present invention is specifically designed for reinforcing the shield tunnel segment joints, has strong pertinence, simple construction equipment, and is convenient to construct;

[0013] 2. The shield tunnel segment joint reinforcement structure of the present invention first inserts a long steel buckle into the soil and then rotates it 90 degrees, then drives anchor rods into the holes on the segments on both sides of the damaged joint for grouting, and finally connects the anchor rods to the long steel buckles fixed on the damaged joints through arc-shaped buckle plates, thereby ensuring the reinforcement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the construction of the shield tunnel segment joint reinforcement structure.

[0015] Figure 2 Schematic diagram of the completed effect of the shield tunnel segment joint reinforcement structure.

[0016] Figure 3 Schematic diagram of a broken ring.

[0017] Figure 4 This is an overall schematic diagram of the tunnel damage.

[0018] Figure 5 This is an enlarged schematic diagram of point A.

[0019] Explanation of the reference numerals: 1-soil; 2-long steel buckle; 3-steel cable; 4-axial force gauge; 5-winch; 6-cement mortar; 7-anchor rod with holes; 8-arc buckle plate; 9-segment; 10-normal joint 11-damaged ring; 12-damaged joint; 13-normal ring. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and modifications may be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0021] The shield tunnel segment joint reinforcement structure of the present invention is specially designed for reinforcing the shield tunnel segment joints, has strong pertinence, simple construction equipment and convenient construction; the shield tunnel segment joint reinforcement structure first inserts a long steel buckle into the soil and then rotates it 90°, then drives anchor rods into the openings on the segments on both sides of the damaged joints for grouting, and finally connects the anchor rods to the long steel buckles fixed on the damaged joints through arc-shaped buckle plates, so that the reinforcement effect is guaranteed.

[0022] Embodiment 1

[0023] The normal joint 10 and the damaged joint 12 of the damaged ring 11 of the shield tunnel are as follows: Figure 3-4 As shown; the shield tunnel segment joint reinforcement structure includes a long steel buckle 2, a winch 5, and a perforated anchor rod 7. The long steel buckle 2 is fixed on the normal joint 10 or the damaged joint 12 of the damaged ring 11 of the shield tunnel. The long steel buckle 2 is connected to the winch 5 through a steel cable 3 with an axial force gauge 4; the perforated anchor rod 7 is connected to the long steel buckle 2 fixed on the damaged joint 12 through an arc buckle plate 8, and cement mortar 6 is injected into the soil 1 through the perforated anchor rod 7. The arc buckle plate 8 is arc-shaped and can fit tightly with the damaged joint 12 on the damaged ring 11 of the tunnel, as shown in FIG. Figure 1 and Figure 5 As shown; the effect after the shield tunnel segment joint reinforcement structure is completed and the steel cables and winches are recovered is as follows Figure 2 shown.

[0024] Embodiment 2

[0025] Specific implementation: A shield tunnel has a diameter of 8m. Each ring of the tunnel consists of 1 22.5° and 5 67.5° segments, with a length of 2m and a thickness of 0.3m. The joints of two segments in a certain ring of the tunnel have serious misalignment.

[0026] During the specific construction, follow the following construction steps:

[0027] S1. Preparation before construction: According to the severity of the damaged joints 12 on site and the number of segments 9 in the damaged ring 11, select 6 long steel buckles 2 with a length of 300 mm, a width of 60 mm, and a thickness of 35 mm, select 6 7-wire prestressed steel strands as steel cables 3, select an 80kW winch 5, select an arc buckle plate 8 with an arc length of 200 mm, a width of 50 mm, and a thickness of 25 mm, select a 9m long, 22mm diameter anchor rod 7, and transport the equipment and materials to the construction site;

[0028] S2. Fixing equipment: erect the hoist 5 on site; make a groove of 300 mm in length and 60 mm in width on the normal joint 10 and the damaged joint 12 of the damaged ring 11 of the tunnel according to the size of the long steel buckle 2, then insert the long steel buckle 2 into the soil 1, and then rotate the long steel buckle 2 90° so that the long steel buckle 2 horizontally buckles the pipe segments 9 on the left and right sides of the normal joint 10 and the damaged joint 12; finally, connect the long steel buckle 2 to the hoist 5 through the steel cable 3 with the axial force meter 4;

[0029] S3, on-site construction: respectively make holes with a diameter of 25 mm on the pipe segments 9 on both sides of the damaged joint 12; start the winch 5 to restore the damaged joint 12 to the state of the normal joint 10. During this period, pay attention to the axial force gauge on the steel cable 3 to avoid excessive axial force in one direction; respectively drive a perforated anchor rod 7 through the openings on the pipe segments 9 on both sides of the damaged joint 12, and then inject cement mortar 6 into the soil 1 through the perforated anchor rod 7; finally, after curing for 7 days, connect the perforated anchor rod 7 to the long steel buckle 2 fixed to the damaged joint 12 through the arc buckle plate 8.

[0030] S4. Site cleaning: fill the grooves opened at the normal joints 10, recover the steel cables 3 and winch 5, tidy up the site, and remove the equipment.

Claims

1. A construction method for a shield tunnel segment joint reinforcement structure, characterized in that: The shield tunnel segment joint reinforcement structure comprises a long steel buckle (2), a winch (5), and a perforated anchor rod (7); the long steel buckle (2) is fixed on a normal joint (10) or a damaged joint (12) of a damaged ring (11) of the shield tunnel, and the long steel buckle (2) is connected to the winch (5) via a steel cable (3) with an axial force gauge (4); the perforated anchor rod (7) is connected to the long steel buckle (2) fixed on the damaged joint (12) via an arc buckle plate (8), and cement mortar (6) is injected into the soil (1) via the perforated anchor rod (7); the arc buckle plate (8) is arc-shaped, and the arc buckle plate (8) can be tightly fitted with the damaged joint (12) on the damaged ring (11) of the tunnel; The construction steps include: S1. Preparation before construction: according to the severity of the damaged joint (12) on site and the number of segments (9) in the damaged ring (11), determine the size and quantity of the long steel buckle (2) and steel cable (3), the power of the winch (5), the specifications of the arc buckle plate (8) and the anchor rod with holes (7) to be used; transport the equipment and materials to the construction site; S2, equipment fixing: erecting a winch (5) on site; slotting the normal joint (10) and the damaged joint (12) of the damaged ring (11) of the tunnel according to the size of the long steel buckle (2), then inserting the long steel buckle (2) into the soil (1), and then rotating the long steel buckle (2) by 90 degrees, so that the long steel buckle (2) horizontally buckles the pipe segments (9) on the left and right sides of the normal joint (10) and the damaged joint (12); finally, connecting the long steel buckle (2) to the winch (5) through a steel cable (3) with an axial force meter (4); S3, on-site construction: respectively opening holes on the pipe segments (9) on both sides of the damaged joint (12); starting the winch (5) to restore the damaged joint (12) to the state of a normal joint (10); respectively driving a perforated anchor rod (7) through the opening holes on the pipe segments (9) on both sides of the damaged joint (12), and then injecting cement mortar (6) into the soil (1) through the perforated anchor rod (7); and finally, after curing for a period of time, connecting the perforated anchor rod (7) to the long steel buckle (2) fixed to the damaged joint (12) through the arc buckle plate (8); S4. Site cleaning: fill the grooves at the normal joints (10), retrieve the steel cables (3) and winches (5), tidy up the site, and remove the equipment.

Images