A double slurry reinforcement device for shield construction

Abstract

The present invention discloses a double-slurry reinforcement device for shield construction, comprising a support platform, the support platform is fixedly connected to a lifting hydraulic rod, the lower end of the lifting hydraulic rod is fixedly connected to a grouting box body, two partitions are fixedly connected in the middle of the grouting box body, grouting drill pipes are arranged at intervals at the bottom of the grouting box body, the partitions are provided with sliding holes, a circular tube with one end closed is slidably connected in the sliding holes, a support spring is fixedly connected between the upper end of the circular tube and the inner wall of the grouting box body, the grouting drill pipes are provided with side holes, the circular tubes are provided with pouring holes, and the pouring holes can be located on the upper or lower side of the partition. The present invention cooperates with the change in the depth of the grouting drill pipes, so that the grouting drill pipes on both sides are always connected to the lower chamber and poured with the first slurry, and the grouting drill pipe in the middle is first poured with the first slurry, then poured with the second slurry, and finally poured with the first slurry, so that high-strength reinforcement grouting is performed on the periphery of the second slurry reinforced soil body with low strength, thereby making subsequent shield excavation more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of foundation grouting reinforcement, and in particular to a double-slurry reinforcement device for shield construction. Background Art

[0002] A shield machine is a tunnel boring machine that uses the shield method. When a shield machine passes through local areas such as silty soil, sandy clay soil, or fully weathered to slightly weathered granite gneiss geology, it is necessary to improve the soil strength in the local area underground through grouting to increase the support strength.

[0003] When the shield machine encounters a grouting reinforcement area during excavation, the pressure at the front end of the cutterhead will suddenly increase, which can easily cause the cutterhead to get stuck and the tool to wear. Therefore, it cannot effectively balance the foundation reinforcement strength and the convenience of shield excavation. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a double-slurry reinforcement device for shield construction, thereby solving the problems existing in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A double-grout reinforcement device for shield construction comprises a support platform, the support platform is fixedly connected to a lifting hydraulic rod, the lower end of the lifting hydraulic rod is fixedly connected to a grouting box body, two partitions are fixedly connected to the middle of the grouting box body, grouting drill pipes are arranged at intervals at the bottom of the grouting box body, the partitions are provided with sliding holes, a circular tube with one end closed is slidably connected in the sliding holes, a support spring is fixedly connected between the upper end of the circular tube and the inner wall of the grouting box body, the grouting drill pipe is provided with a side hole, the circular tube is provided with a grouting hole, and the grouting hole can be located on the upper side or the lower side of the partition;

[0007] The two partitions divide the grouting box into an upper chamber, a middle chamber and a lower chamber. The first slurry is pumped into the upper chamber and the lower chamber, and the second slurry is pumped into the middle chamber. The reinforcement strength of the second slurry is lower than that of the first slurry.

[0008] The grouting drill pipe is driven to rise and fall relative to the grouting box body by a jacking device.

[0009] Preferably, the first slurry is a mixture of cement, water glass and water, and the second slurry is a mixture of phosphoric acid, water glass and water.

[0010] Preferably, the bottom of the grouting box body is rotatably connected to a rotary table, the rotary table corresponds to the grouting drill pipe one by one and is axially slidably connected with a shaft key.

[0011] Preferably, all the rotary tables are driven to rotate by synchronous belts.

[0012] Preferably, the lifting device includes two hanging plates, one of which is fixedly connected to each of the two sides of the bottom of the grouting box body, the hanging plates are provided with a rotating groove, one side of the hanging plates is fixedly connected to a reversing motor, the main shaft of the reversing motor extends into the rotating groove and is fixedly connected to a swing plate, the swing plate is provided with a clamping groove, an arc-shaped steel plate is clamped between the clamping grooves of the two swinging plates, and the first spring is fixedly connected between the two ends of the arc-shaped steel plate and the corresponding clamping grooves;

[0013] The grouting drill pipe is rotatably connected to a limiting ring, an annular groove is arranged on the outside of the limiting ring, an avoidance hole is arranged on the arc-shaped steel plate, the outer diameter of the limiting ring is larger than the avoidance hole and the inner diameter of the annular groove is smaller than the avoidance hole.

[0014] The advantages of the present invention are that: the double-slurry reinforcement device for shield construction provided by the present invention forms a distribution with a deep lower middle and shallow sides through multiple grouting drill pipes. At this time, all the grouting drill pipes are connected to the lower chamber to carry out grouting of the first slurry. As the grouting box body rises, coordinated with the lifting and lowering of the jacking device, the multiple grouting drill pipes form a distribution with a deep lower middle and shallow sides, which changes to a state with a flush lower end, and finally changes to a state with a high middle and low two ends. During the change process of the grouting drill pipes, the grouting drill pipes on both sides are always connected to the lower chamber and filled with the first slurry. The grouting drill pipe in the middle is first filled with the first slurry, then filled with the second slurry, and finally filled with the first slurry, so that high-strength reinforcement grouting is carried out on the periphery of the second slurry reinforced soil with low strength, thereby making subsequent shield excavation more convenient.

[0015] The present invention achieves a state in which the lower ends of multiple grouting drill pipes are deep in the middle and shallow on both sides by rotating two reversing motors in opposite directions; the rotation directions of the two reversing motors are adjusted in the opposite direction, so that the arc-shaped steel plates are bent upward, thereby adapting to the special grouting reinforcement requirements of the present invention on the one hand, and on the other hand, all the grouting drill pipes change in positive and negative arcs, and with the arrangement of the upper chamber, the middle chamber and the lower chamber, the first grouting forming a reinforcement layer on the periphery can better surround the second grouting area in the middle, avoiding the formation of excessive reinforcement bodies on the shield excavation path. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a basic structural diagram of the present invention;

[0017] Figure 2 It is a schematic diagram of the internal structure of the grouting box of the present invention;

[0018] Figure 3 yes Figure 2 A local enlarged view of point E in FIG;

[0019] Figure 4 It is a schematic diagram of the foundation reinforcement using the first slurry and the second slurry of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] Example 1

[0022] like Figures 1 to 4 As shown, the present invention provides a double-grouting reinforcement device for shield construction, comprising a support platform 1, the support platform 1 is fixedly connected to a lifting hydraulic rod 11, the lower end of the lifting hydraulic rod 11 is fixedly connected to a grouting box body 12, two partitions 2 are fixedly connected to the middle of the grouting box body 12, grouting drill pipes 3 are arranged at intervals at the bottom of the grouting box body 12, the partition 2 is provided with a sliding hole, a circular tube 4 with one end closed is slidably connected in the sliding hole, a support spring 41 is fixedly connected between the upper end of the circular tube 4 and the inner wall of the grouting box body 12, the grouting drill pipe 3 is provided with a side hole 42, and the circular tube 4 is provided with a pouring hole 43, the pouring hole 43 can be located on the upper side or the lower side of the partition 2, and the circular tubes 4 of the two partitions 2 are mirror-symmetrical;

[0023] The two partitions 2 divide the grouting box body 12 into an upper chamber, a middle chamber and a lower chamber. The circular tube 4 is raised or lowered to connect the grouting drill pipe 3 with the upper chamber, the middle chamber or the lower chamber. The slurry of different chambers is poured into the upper chamber and the lower chamber when needed. The first slurry 10 is pumped into the upper chamber and the lower chamber, and the second slurry 20 is pumped into the middle chamber. The reinforcement strength of the second slurry 20 is less than the reinforcement strength of the first slurry 10. The first slurry 10 is a mixture of cement, water glass and water with a mixing ratio of 1:0.8:1. The second slurry 20 is a mixture of phosphoric acid, water glass and water with a mixing ratio of 0.05:1:1. The grouting of the second slurry 20 prevents the soil from having too high a solidification strength, excessive wear of the cutter head, and prevents the cutter head from locking.

[0024] For example, the injection hole 43 of the upper circular tube 4 is located in the middle cavity, and the upper end of the corresponding grouting drill pipe 3 is located in the middle cavity. At this time, the second slurry 20 is injected into the grouting drill pipe 3; as the grouting drill pipe 3 rises relative to the grouting box body 12, the grouting drill pipe 3 pushes the injection hole 43 of the circular tube 4 into the upper cavity. At this time, the grouting drill pipe 3 is inserted into the circular tube 4 and forms a side hole 42 and a connection between the injection hole 43. At this time, the first slurry can be injected into the soil below; the grouting working principle of the grouting drill pipe 3 descending into the lower cavity is the same, so it can form Figure 4 Extent of grouting reinforcement shown.

[0025] The grouting drill pipe 3 is driven to rise and fall relative to the grouting box body 12 by the jacking device.

[0026] After the grouting box 12 rises, cooperate with the lifting and lowering of the jacking device (the jacking device can adopt the existing technology to install a hydraulic rod on each grouting drill pipe 3 to adjust the height one by one), the multiple grouting drill pipes 3 form a distribution with a deep lower middle and shallower sides, which changes to a state with a flush lower end, and finally changes to a state with a high middle and low two ends. During the change process of the grouting drill pipes 3, the grouting drill pipes 3 on both sides are always connected to the lower chamber and filled with the first slurry 10. The grouting drill pipe 3 in the middle is first filled with the first slurry 10, and then the second slurry 20 is filled, and finally the first slurry 10 is filled, so that high-strength reinforcement grouting is performed on the periphery of the soil reinforced by the second slurry 20 with low strength, thereby making subsequent shield excavation more convenient.

[0027] The bottom of the grouting box body 12 is rotatably connected to the rotary table 5, which corresponds to the grouting drill pipe 3 one by one and is axially slidably connected by the shaft key. All the rotary tables 5 are driven to rotate by the synchronous belt 51, and the grouting drill pipe 3 rotates so that grouting reinforcement is evenly performed on the soft soil outside.

[0028] Example 2

[0029] like Figures 1 to 4 As shown, the jacking device of Example 1 adopts a separate lifting control so that the grouting control is not easy to achieve. Figure 4 The grouting effect shown, therefore, the present embodiment discloses a jacking device including two hanging plates 61, one hanging plate 61 is fixedly connected to each of the two sides of the bottom of the grouting box body 12, a rotating groove 62 is provided on the hanging plate 61, one side of the hanging plate 61 is fixedly connected to a reversing motor 63, the main shaft of the reversing motor 63 extends into the rotating groove 62 and is fixedly connected to a swing plate 64, the swing plate 64 is provided with a clamping groove 65, an arc-shaped steel plate 66 is clamped between the clamping grooves 65 of the two swinging plates 64, and first springs 67 are fixedly connected between the two ends of the arc-shaped steel plate 66 and the corresponding clamping grooves 65;

[0030] The grouting drill pipe 3 is rotatably connected to the limiting ring 68, an annular groove 69 is provided on the outside of the limiting ring 68, and an avoidance hole 691 is provided on the arc-shaped steel plate 66. The outer diameter of the limiting ring 68 is larger than the avoidance hole 691 and the inner diameter of the annular groove 69 is smaller than the avoidance hole 691. The gap between the limiting ring 68 and the arc-shaped steel plate 66 uses the bending of the arc-shaped steel plate 66.

[0031] In Example 2, the two reversing motors 63 rotate in opposite directions so that the arc-shaped steel plate 66 bends downward, realizing a state in which the lower end of multiple grouting drill pipes 3 is deep in the middle and shallow on both sides; the rotation directions of the two reversing motors 63 are adjusted in the opposite direction so that the arc-shaped steel plate 66 bends upward, thereby adapting to the special grouting reinforcement requirements of the present invention on the one hand, and on the other hand, all the grouting drill pipes 3 change in positive and negative arcs, and cooperate with the settings of the upper chamber, middle chamber and lower chamber, so that the first grouting 10 on the periphery forms a reinforcement layer that can better surround the second grouting 20 area in the middle, avoiding the formation of excessive reinforcement bodies on the shield excavation path.

[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A double-grout reinforcement device for shield construction, comprising a support platform (1), the support platform (1) being fixedly connected to a lifting hydraulic rod (11), the lower end of the lifting hydraulic rod (11) being fixedly connected to a grouting box (12), characterized in that: Two partitions (2) are fixedly connected in the middle of the grouting box body (12), a grouting drill pipe (3) is arranged at intervals at the bottom of the grouting box body (12), a sliding hole is provided on the partition (2), a circular tube (4) with one end closed is slidably connected in the sliding hole, a support spring (41) is fixedly connected between the upper end of the circular tube (4) and the inner wall of the grouting box body (12), a side hole (42) is provided on the grouting drill pipe (3), and a grouting hole (43) is provided on the circular tube (4), and the grouting hole (43) can be located on the upper side or the lower side of the partition (2); The two partitions (2) divide the grouting box body (12) into an upper chamber, a middle chamber, and a lower chamber. The first slurry (10) is pumped into the upper chamber and the lower chamber, and the second slurry (20) is pumped into the middle chamber. The reinforcement strength of the second slurry (20) is less than the reinforcement strength of the first slurry (10). The grouting drill pipe (3) is driven to rise and fall relative to the grouting box (12) by a jacking device; The lifting device comprises two hanging plates (61), one hanging plate (61) is fixedly connected to both sides of the bottom of the grouting box body (12), the hanging plate (61) is provided with a rotation groove (62), one side of the hanging plate (61) is fixedly connected to a reversing motor (63), the main shaft of the reversing motor (63) extends into the rotation groove (62) and is fixedly connected to a swing plate (64), the swing plate (64) is provided with a clamping groove (65), an arc-shaped steel plate (66) is clamped between the clamping grooves (65) of the two swing plates (64), and a first spring (67) is fixedly connected between the two ends of the arc-shaped steel plate (66) and the corresponding clamping grooves (65). The grouting drill pipe (3) is rotatably connected to a limiting ring (68), an annular groove (69) is provided on the outside of the limiting ring (68), and an avoidance hole (691) is provided on the arc-shaped steel plate (66), the outer diameter of the limiting ring (68) is larger than the avoidance hole (691) and the inner diameter of the annular groove (69) is smaller than the avoidance hole (691).

2. A shield construction double slurry reinforcement device according to claim 1, characterized in that: The first slurry (10) is a mixture of cement, water glass and water, and the second slurry (20) is a mixture of phosphoric acid, water glass and water.

3. A shield construction double slurry reinforcement device according to claim 1, characterized in that: The bottom of the grouting box body (12) is rotatably connected to the rotating platform (5), and the rotating platform (5) corresponds to the grouting drill pipe (3) one by one and is axially slidably connected by a shaft key.

4. A shield construction double slurry reinforcement device according to claim 3, characterized in that: All the rotating tables (5) are driven to rotate by synchronous belts (51).

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