High-speed rail station foundation pretreatment device

Abstract

The utility model relates to the technical field of foundation treatment equipment, and particularly discloses a high-speed railway station foundation pretreatment device which comprises a liquid injection pipe (1), the lower end of the liquid injection pipe (1) is fixedly connected with a baffle (13), a plurality of liquid injection holes (11) are evenly formed in the pipe wall of the liquid injection pipe (1), a base rod (2) is arranged in the liquid injection pipe (1), and a piston (21) is installed at the lower end of the base rod (2). And the piston (21) is connected in the liquid injection pipe (1) in a sliding manner. The high-speed railway station foundation pretreatment device has the advantages that alkali liquor is injected into the interlayer, the alkali liquor can be sprayed out from the lowest liquid injection hole, then the base rod and the piston move upwards, the alkali liquor can not be sprayed out from the liquid injection hole in the position after passing through the lowest liquid injection hole of the piston, and the alkali liquor can not be sprayed out from the liquid injection hole in the position after passing through the lowest liquid injection hole of the piston. Therefore, the alkali liquor is sprayed out from each liquid injection hole in sequence along with continuous rising of the piston, so that the alkali liquor is sprayed uniformly.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation treatment equipment, and in particular to a high-speed railway station foundation pretreatment device. Background Art

[0002] In the construction of municipal engineering, according to the requirements of the superstructure for the foundation, it is necessary to carry out necessary pretreatment of the foundation, such as reinforcing or improving the foundation, so as to improve the bearing capacity of the foundation, ensure the stability of the foundation, reduce the settlement or uneven settlement of the superstructure, eliminate the collapsible loess and improve the anti-liquefaction ability. At present, the pretreatment methods of the foundation include: deep tamping method in the hole, replacement cushion method, tamping method, sand and gravel pile method, vibration method, cement soil mixing method, high-pressure jet grouting method, preloading method, ramming cement soil pile method, cement fly ash gravel pile method, lime pile method, lime soil compaction pile method and soil compaction pile method, column hammer expansion pile method, single liquid silicification method and alkali solution method. Among them, the alkali solution reinforcement method refers to a method of reinforcing the soil by heating the sodium hydroxide solution diluted with water and then infiltrating it into the soil through the grouting pipe without pressure. The alkaline solution produces a replacement reaction with soluble alkaline earth metal cations such as calcium and magnesium that exist in large quantities in loess to form alkaline earth metal calcium oxide compounds, which are precipitated on the surface of the upper particles; the alkaline solution also reacts with fine particles such as free silicon dioxide, aluminum oxide and aluminosilicates in the soil to form sodium silicates and sodium aluminates; the alkaline solution also causes the surface of the soil particles to gradually expand and soften, allowing adjacent soil particles to be in close contact, dissolve and cement each other into a higher strength whole, thereby improving the strength of the soil.

[0003] CN202123440021.X discloses a foundation pretreatment device for municipal engineering, including an injection pipe and a central bracket. The lower end of the injection pipe is closed, and injection holes are evenly arranged on the body of the injection pipe. The upper edge of the injection hole is provided with an anti-blocking shielding cover protruding outward, and the anti-blocking shielding cover opens downward. This foundation pretreatment device injects alkali solution into the injection pipe, and the alkali solution flows out of the injection hole under the action of its own gravity and sprays onto the hole wall of the perfusion hole. During the process of spraying alkali solution in this pretreatment device, the alkali solution sprayed from the injection hole from bottom to top will gradually decrease, which causes uneven alkali solution on the hole wall of the perfusion hole, thereby affecting the reinforcement quality. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a high-speed railway station foundation pretreatment device.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A high-speed railway station foundation pretreatment device comprises an injection pipe, the lower end of which is fixedly connected to a baffle, a plurality of injection holes are evenly arranged on the pipe wall of the injection pipe, a base rod is arranged in the injection pipe, a piston is installed at the lower end of the base rod, and the piston is slidably connected in the injection pipe.

[0007] Preferably, the injection hole is arranged obliquely downward from the inside to the outside of the injection tube.

[0008] Preferably, the diameter of the base rod is smaller than the inner diameter of the injection tube, and the base rod and the injection tube form an interlayer for containing the alkali solution.

[0009] Preferably, an anti-blocking shielding cover protruding outward is provided on the upper edge of the liquid injection hole, the anti-blocking shielding cover opens downward, and the anti-blocking shielding cover is fixed on the outer wall of the liquid injection tube.

[0010] Preferably, the piston is made of alkali-resistant material.

[0011] Beneficial effects of the utility model: the utility model provides a high-speed railway station foundation pretreatment device, which injects alkali liquid into the interlayer, and the alkali liquid will first be sprayed out from the lowest injection hole, and then the base rod and the piston are moved upward. When the piston reaches the lowest injection hole, the alkali liquid cannot be sprayed out from the injection hole at this position. Therefore, as the piston continues to rise, the alkali liquid will be sprayed out from each injection hole in turn, so that the alkali liquid is sprayed evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a basic structural diagram of a high-speed railway station foundation pretreatment device provided by the utility model;

[0013] Figure 2 yes Figure 1 A local enlarged view of point A;

[0014] Figure 3 It is a usage state diagram of the utility model. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model. Example 1

[0016] like Figure 1-3 As shown, a high-speed railway station foundation pretreatment device of this embodiment includes an injection pipe (1), and the lower end of the injection pipe 1 is fixedly connected to a baffle 13, and the baffle 13 is used to prevent the alkali solution from flowing out from the bottom of the injection pipe 1. A plurality of injection holes 11 are evenly arranged on the wall of the injection pipe 1, and an anti-blocking shielding cover 12 protruding outward is arranged on the upper edge of the injection hole 11. The anti-blocking shielding cover 12 opens downward, and the anti-blocking shielding cover is fixed on the outer wall of the injection pipe 1. The shielding cover 12 prevents the soil in the injection hole from sliding down and blocking the injection hole 11. The injection hole 11 is arranged to be inclined downward from the inside to the outside of the injection pipe 1. In this way, the injection hole 11 is less likely to be blocked.

[0017] A base rod 2 is provided in the injection tube 1, and the diameter of the base rod 2 is smaller than the inner diameter of the injection tube 1. The base rod 2 and the injection tube 1 form an interlayer 22 for containing alkali solution. A piston 21 is provided at the lower end of the base rod 2, and the piston 21 is slidably connected in the injection tube 1. The piston 21 is made of alkali-resistant material to prevent the alkali solution from corroding the piston 21.

[0018] During use, alkali solution is injected into the interlayer 22, and the alkali solution will first be sprayed out from the lowest injection hole 11, and then the base rod 2 together with the piston 21 is moved upward. When the piston 21 reaches the lowest injection hole 11, the alkali solution cannot be sprayed out from the injection hole 11 at this position. Therefore, as the piston 21 continues to rise, the alkali solution will be sprayed out from each injection hole 11 in turn, so that the alkali solution is sprayed evenly. Example 2

[0019] A high-speed railway station foundation pretreatment device of the present embodiment includes a base plate 3, a liquid injection pipe 1 rotates in the center hole of the base plate 3, and a plurality of telescopic adjustment rods 4 are fixedly connected to the lower side of the base plate 3. The foundation pretreatment device of the present embodiment can be supported as a whole above the foundation 100 through the telescopic adjustment rods 4, and the telescopic adjustment rods 4 can change the length, so that the foundation pretreatment device can be used above the uneven foundation 100. A motor 31 is installed on the base plate 3, and a gear 32 is fixedly connected to the main shaft of the motor 31. The outer side of the liquid injection pipe 1 is sleeved with a fixed gear ring 33, and the gear ring 33 is meshed with the gear 32. The motor 31 drives the gear 32 to rotate, so that the liquid injection pipe 1 can rotate in the center hole of the base plate 3, so that the alkali solution can be evenly sprayed on the inner wall of the perfusion hole 200. A hydraulic cylinder 5 is fixedly connected to the base plate 3, and a crossbeam 6 is fixedly connected to the upper side of the hydraulic cylinder 5, and the crossbeam 6 is fixed to the base rod 2. In this way, the crossbeam 6 can be moved upward by the hydraulic cylinder 5, thereby driving the base rod 2 and the piston 21 to move upward. A telescopic guide rod 7 is fixedly connected between the cross beam 6 and the base plate 3 , and the lifting and lowering of the cross beam 6 is guided by the telescopic guide rod 7 , so that the cross beam 6 moves up and down smoothly.

Claims

1. A high-speed railway station foundation pretreatment device, comprising a liquid injection pipe (1), the lower end of the liquid injection pipe (1) is fixedly connected to a baffle (13), and a plurality of liquid injection holes (11) are evenly arranged on the wall of the liquid injection pipe (1), characterized in that: A base rod (2) is provided in the injection tube (1), a piston (21) is provided at the lower end of the base rod (2), and the piston (21) is slidably connected in the injection tube (1).

2. A high-speed railway station foundation pretreatment device according to claim 1, characterized in that: The injection hole (11) is arranged obliquely downward from the inside to the outside of the injection tube (1).

3. A high-speed railway station foundation pretreatment device according to claim 1, characterized in that: The diameter of the base rod (2) is smaller than the inner diameter of the liquid injection tube (1), and the base rod (2) and the liquid injection tube (1) form an interlayer (22) for containing alkali liquid.

4. A high-speed railway station foundation pretreatment device according to claim 1, characterized in that: An anti-blocking shield (12) protruding outward is provided on the upper edge of the liquid injection hole (11); the anti-blocking shield (12) opens downward and is fixed to the outer wall of the liquid injection tube (1).

5. The high-speed railway station foundation pretreatment device according to claim 1, characterized in that: The piston (21) is made of alkali-resistant material.

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