Double-slurry reinforcing device for shield construction

Abstract

The invention discloses a shield construction double slurry reinforcing device which comprises a supporting platform, a lifting hydraulic rod fixedly connected with the supporting platform, a grouting box fixedly connected with the lower end of the lifting hydraulic rod, two partition plates fixedly connected with the middle of the grouting box, grouting drill pipes arranged at the bottom of the grouting box at intervals, and sliding holes formed in the partition plates. A round pipe with one closed end is slidably connected into the sliding hole, a supporting spring is fixedly connected between the upper end of the round pipe and the inner wall of the grouting box body, the grouting drill pipe is provided with a side hole, and the round pipe is provided with a grouting hole which can be located on the upper side or the lower side of the partition plate. The grouting drill pipes on the two sides communicate with the lower cavity all the time and are filled with the first grout in cooperation with the depth changes of the grouting drill pipes, the first grout is firstly filled into the grouting drill pipe in the middle, then the second grout is filled into the grouting drill pipe in the middle, and finally the first grout is filled into the grouting drill pipe in the middle, so that high-strength reinforcing grouting is conducted on the periphery of a soil body reinforced by the second grout low in strength; and therefore, the subsequent shield tunneling is more convenient.

Description

Technical Field

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

[0002] A shield machine is a tunnel boring machine that uses the shield method. When the 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 by 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 is impossible to effectively balance the strength of the foundation reinforcement 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-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 to the middle of the grouting box body, a grouting drill pipe is arranged at intervals at the bottom of the grouting box body, a sliding hole is arranged on the partition, a round tube with one end closed is slidably connected in the sliding hole, a support spring is fixedly connected between the upper end of the round tube and the inner wall of the grouting box body, a side hole is arranged on the grouting drill pipe, and a pouring hole is arranged on the round tube, and the pouring 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 less 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 rotating table, the rotating table corresponds to the grouting drill pipe one by one and is axially slidably connected with a shaft key.

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

[0012] Preferably, the lifting device comprises two hanging plates, one hanging plate is fixedly connected to each other on both 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 outer side 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 as follows: a double-slurry reinforcement device for shield construction provided by the present invention forms a distribution with a deep lower middle part and shallow two sides through multiple grouting drill pipes. At this time, all the grouting drill pipes are connected with the lower chamber to carry out grouting of the first slurry. As the grouting box rises, in coordination with the lifting and lowering of the jacking device, the multiple grouting drill pipes form a distribution with a deep lower middle part and shallow two sides, which changes into a state with a flush lower end, and finally changes into a state with a high middle part and low two ends. During the change process of the grouting drill pipes, the grouting drill pipes on both sides are always connected with the lower chamber and filled with the first slurry. The grouting drill pipe in the middle is first filled with the first slurry, then with the second slurry, and finally with the first slurry, so that high-strength reinforcement grouting is carried out on the periphery of the second slurry reinforced soil body 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, and the rotation directions of the two reversing motors are adjusted in the opposite direction, so that the arc-shaped steel plate 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 change in positive and negative arcs, and the settings of the upper chamber, the middle chamber and the lower chamber are coordinated, so that the first grouting reinforcement layer formed by the outer 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 schematic diagram of the present invention;

[0017] Figure 2 It is a schematic diagram of the internal structure of the grouting box body 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 reinforcement of the foundation by the first slurry and the second slurry of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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, a double-slurry reinforcement device for shield construction provided by the present invention comprises 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, a grouting drill pipe 3 is arranged at intervals at the bottom of the grouting box body 12, a sliding hole is arranged 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 arranged on the grouting drill pipe 3, and a pouring hole 43 is arranged on the circular tube 4, 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. When necessary, slurry from different chambers is poured 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 that 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, and 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 disc, and locking of the cutter disc.

[0024] For example, the injection hole 43 of the upper circular tube 4 is located in the middle chamber, and the upper end of the corresponding grouting drill pipe 3 is located in the middle chamber. 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 chamber. At this time, the grouting drill pipe 3 is inserted into the circular tube 4 and forms a connection between the side hole 42 and 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 chamber 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 a jacking device.

[0026] The grouting drill pipes 3 of the present invention are all deeply inserted into the soil body, and multiple grouting drill pipes 3 form a distribution with a deep lower middle part and shallower sides. At this time, all the grouting drill pipes 3 are connected to the lower chamber to carry out grouting of the first slurry 10. As the grouting box 12 rises, in coordination with the lifting and lowering of the jacking device (the jacking device can adopt the prior art to install a hydraulic rod on each grouting drill pipe 3 to adjust the height one by one), multiple grouting drill pipes 3 form a state where the lower middle part is deep and the two sides are shallow, which changes into a state where the lower ends are flush, and finally changes into a state where the middle part is high and the two ends are low. 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 poured with the first slurry 10. The grouting drill pipe 3 in the middle is first poured with the first slurry 10, then poured with the second slurry 20, and finally poured with the first slurry 10, so that high-strength reinforcement grouting is carried out on the periphery of the soil body reinforced with the second slurry 20 of low strength, thereby making subsequent shield excavation more convenient.

[0027] The bottom of the grouting box body 12 is rotatably connected to the rotating table 5, which corresponds to the grouting drill pipe 3 one by one and is axially slidably connected by the shaft key. All the rotating 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 outer soft soil.

[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 both sides of the bottom of the grouting box body 12, the hanging plate 61 is provided with a rotating 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 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 the two ends of the arc-shaped steel plate 66 are respectively fixedly connected to the first spring 67 between the corresponding clamping grooves 65;

[0030] The grouting drill pipe 3 is rotatably connected to the limiting ring 68, an annular groove 69 is arranged on the outer side of the limiting ring 68, and an avoidance hole 691 is arranged on the arc 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 steel plate 66 uses the bending of the arc 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, thereby achieving a state in which the lower ends of multiple grouting drill pipes 3 are 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 with the arrangement of the upper chamber, the middle chamber and the lower chamber, the first grouting 10 on the periphery forms a reinforcement layer that can better surround the second grouting 20 area in the middle, thereby avoiding the formation of excessive reinforcement bodies on the shield excavation path.

[0032] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present 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) 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 (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 arranged on the partition (2), a round tube (4) with one end closed is slidably connected in the sliding hole, a supporting spring (41) is fixedly connected between the upper end of the round tube (4) and the inner wall of the grouting box body (12), a side hole (42) is arranged on the grouting drill pipe (3), and a grouting hole (43) is arranged on the round 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 lower 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 body (12) by a jacking device.

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

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

5. A double slurry reinforcement device for shield construction according to claim 1, characterized in that: 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 rotating 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 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 swing plates (64), and the 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 arranged outside the limiting ring (68), an avoidance hole (691) is arranged 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).

Images