Construction method of large-diameter bridge pipe pile based on soil plugging effect

Abstract

The invention relates to the technical field of bridge foundations, in particular to a construction method of a large-diameter bridge pipe pile based on the soil plug effect, in the pile sinking process of the large-diameter bridge pipe pile, a slurry inlet pipe is externally connected with a high-pressure water supply device, a slurry injection pipe injects high-pressure water through the high-pressure water supply device to damage a soil plug and form slurry, and the slurry is injected into the large-diameter bridge pipe pile. Meanwhile, the slurry outlet pipe is externally connected with a slurry suction device, and slurry is sucked through the slurry suction pipe; the hammering grouting body is hammered, and a guide hole is formed in the lower portion of the large-diameter bridge pipe pile through the soil penetrating grouting body; and the slurry inlet pipe is externally connected with a slurry injection device, and slurry is injected through the slurry injection pipe, so that soil plugs are formed in the large-diameter bridge pipe pile and the guide holes. The method has the advantages that in the pile sinking process, the problem that the large-diameter bridge pipe pile is difficult to sink is solved while the soil plug is destroyed, the pile forming bearing capacity is improved by restoring the soil plug through grouting, and meanwhile the problem of soil layer disturbance is solved by destroying the soil plug in the large-diameter bridge pipe pile.

Description

Technical Field

[0001] The invention relates to the technical field of bridge foundations, and in particular to a construction method for large-diameter bridge pipe piles based on soil plug effect. Background Art

[0002] In order to promote the industrialization and standardized construction level of bridge pile foundations, and promote green construction and environmental protection construction, large-diameter prestressed bridge pipe piles are gradually applied to bridge pile foundations. At present, the commonly used construction methods of prestressed pipe piles are hammering method and static pressure method. Due to the limitations of geological soil conditions, when the pile tip passes through the hard soil layer or the pile is long, it is often difficult to sink the pile. This problem is more prominent for large-diameter bridge pipe piles.

[0003] The research results show that the difficulty of sinking large-diameter prestressed pipe piles is related to the soil properties and soil plug effect. In order to solve the problem of the difficulty of sinking prestressed pipe piles, new construction methods have emerged one after another, such as hole-assisted construction, rigid composite pile method, rotary pile planting method, mid-excavation method, and pilot soil pressure prefabricated pile method. However, the above existing methods inevitably cause disturbance of the soil layer on the pile side, disturbance of the soil layer at the pile end, and damage to the pile soil plug, which in turn affects the bearing capacity of the pipe pile. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method for large-diameter bridge pipe piles based on the soil plug effect in light of the above-mentioned deficiencies in the prior art, which solves the difficulty in sinking large-diameter bridge pipe piles by destroying the soil plug while drilling holes during the pile sinking process, and then restores the soil plug by grouting to improve the pile bearing capacity, while solving the soil disturbance problem by destroying the soil plug inside the large-diameter bridge pipe pile.

[0005] The purpose of the present invention is achieved by the following technical solutions: A construction method for large-diameter bridge pipe piles based on soil plug effect, characterized in that the construction method comprises the following steps: A hammer grouting body, a transmission cylinder and a soil-penetrating grouting body are arranged inside the large-diameter bridge pipe pile, wherein the transmission cylinder is arranged at the bottom of the hammer grouting body, the soil-penetrating grouting body is arranged at the bottom of the transmission cylinder, the hammer grouting body is provided with a grouting outlet pipe and a grouting inlet pipe, the transmission cylinder is provided with a grouting suction pipe, the grouting suction pipe is connected to the grouting outlet pipe, the soil-penetrating grouting body is provided with a grouting injection pipe, the grouting injection pipe is connected to the grouting inlet pipe, and the outer end opening of the grouting injection pipe is arranged on the outer wall of the soil-penetrating grouting body; During the sinking process of the large-diameter bridge pipe pile, the grout inlet pipe is connected to a high-pressure water supply device, the grout injection pipe sprays high-pressure water through the high-pressure water supply device to destroy the soil plug and form mud, and the grout outlet pipe is connected to a mud suction device to suck mud through the grout suction pipe; Hammering the hammer grouting body to form a guide hole below the large-diameter bridge pipe pile through the soil penetration grouting body; The grout inlet pipe is externally connected to a slurry injection device, and grouting is performed through the grouting pipe to form a soil plug inside the large-diameter bridge pipe pile and the guide hole.

[0006] The outer contour size of the transmission cylinder is larger than the outer contour size of the soil-penetrating grouting body, and the grouting pipe arranged on the transmission cylinder is located at a part of the transmission cylinder that is larger than the soil-penetrating grouting body.

[0007] Along the cross-sectional direction of the soil-penetrating grouting body, a plurality of grouting pipes are evenly arranged in a scattered manner.

[0008] Along the height direction of the soil-penetrating grouting body, a plurality of grouting pipes are evenly arranged at intervals.

[0009] The slurry sucked by the grout suction pipe is retained in situ, and then injected back into the large-diameter bridge pipe pile and the guide hole through the grout inlet pipe and the grout injection pipe.

[0010] After the slurry is sucked, an admixture is added into the slurry, and then the slurry is injected back into the large-diameter bridge pipe pile and the guide hole through the slurry inlet pipe and the slurry injection pipe.

[0011] The advantages of the present invention are as follows: the difficulty in sinking large-diameter bridge pipe piles is solved by destroying soil plugs while drilling holes during the pile sinking process, the bearing capacity of the pile is improved by restoring the soil plugs through grouting, and at the same time, the soil plugs inside the large-diameter bridge pipe piles are destroyed to solve the soil disturbance problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention when the pile is sunk and the soil plug is destroyed; Figure 2 It is a structural schematic diagram of the present invention when it is in a hole-leading state; Figure 3 It is a schematic diagram of the structure of the present invention when it is in a grouting and soil plugging recovery state; Figure 4 It is a structural plan view of the present invention. DETAILED DESCRIPTION

[0013] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: like Figure 1-4 As shown, the reference numerals in the figure respectively represent: large diameter bridge pipe pile 1, hammer grouting body 2, transmission cylinder 3, soil penetration grouting body 4; slurry outlet pipe 21, slurry inlet pipe 22; slurry suction pipe 31; slurry injection pipe 41.

[0014] Example: Figures 1 to 4 As shown, the construction method of large-diameter bridge pipe piles based on soil plug effect in this embodiment is used in the pile sinking construction of large-diameter bridge pipe piles 1.

[0015] Specifically, the construction method in this embodiment involves a construction machine, which includes a hammer grouting body 2, a transmission cylinder 3, and a soil-penetrating grouting body 4, wherein the transmission cylinder 3 is arranged at the bottom of the hammer grouting body 2, and the two are fixedly connected; the soil-penetrating grouting body 4 is arranged at the bottom of the transmission cylinder 3, and the two are fixedly connected.

[0016] A slurry outlet pipe 21 and a slurry inlet pipe 22 are arranged inside the hammer grouting body 2. The tops of the slurry outlet pipe 21 and the slurry inlet pipe 22 are both led out from the top of the hammer grouting body 2 so as to be connected to external equipment.

[0017] The grout suction pipe 31 is arranged inside the transmission cylinder 3, and the grout suction pipe 31 is connected with the grout outlet pipe 21. The transmission cylinder 3 can slide inside the large-diameter bridge pipe pile 1 under the drive of the hammer grouting body 2. In this embodiment, the grout inlet pipe 22 on the hammer grouting body 2 passes through the inside of the transmission cylinder 3.

[0018] A grouting pipe 41 is arranged inside the soil-penetrating grouting body 4 , which is connected to the grouting pipe 22 penetrating from the driving cylinder 3 , and the grouting pipe 41 is communicated with the grouting pipe 22 .

[0019] The grout injection pipe 41 sprays high-pressure water through a high-pressure water supply device connected to the slurry inlet pipe 22 or sprays mud through a mud injection device connected to the slurry inlet pipe 22, and the slurry suction pipe 31 sucks out mud through an external mud suction device connected to the slurry outlet pipe 21.

[0020] The through-soil grouting body 4 is used to enter the soil before the large-diameter bridge pipe pile 1 to form a guide hole, and the grouting pipe 41 is used to spray high-pressure water to destroy the soil plug and the slurry formed by the destroyed soil plug is sucked out by the grouting pipe 31; the grouting pipe 41 is used to spray cement slurry to re-form the soil plug.

[0021] During construction, this embodiment includes the following steps: like Figure 1 As shown, the soil-penetrating grouting body 4 penetrates the soil and stands vertically, the large-diameter bridge pipe pile 1 is inserted into the driving cylinder 3 and stands vertically, and the large-diameter bridge pipe pile 1 and the hammering grouting body 2 are hammered at the same time, and the large-diameter bridge pipe pile 1 and the driving cylinder 3 are simultaneously buried in the soil and have the same bottom elevation. At this time, soil plugs are formed and pile sinking is difficult. The grouting pipe 41 is used to spray high-pressure water to destroy the soil plug and the grouting pipe 31 is used to suck out the mud formed by destroying the soil plug, so as to ensure the smooth sinking of the large-diameter bridge pipe pile 1.

[0022] like Figure 2As shown, only by hammering the hammer grouting body 2, the soil penetration grouting body 4 continues to penetrate the soil before the large-diameter bridge pipe pile 1 to form a guide hole, which can also facilitate the sinking of the large-diameter bridge pipe pile 1. At the same time, it provides a more reliable and stable foundation for the soil plug formed subsequently.

[0023] like Figure 3 As shown, after the large-diameter bridge pipe pile 1 is sunk to the designed depth, the soil-penetrating grouting body 4 is lifted up and grouting is sprayed out through the grouting pipe 41 to form a soil plug inside the large-diameter bridge pipe pile 1. The height of the soil plug is subject to the design requirements. In this embodiment, the mud sprayed out by the grouting pipe 41 can be obtained by collecting the mud sucked out by the grouting pipe 31, that is, the mud sucked out by the grouting pipe 31 in the previous construction step is collected on the ground through facilities such as a mud pool. At the same time, in some cases, additives can be added to the sucked mud, and then the mud is injected back into the large-diameter bridge pipe pile 1 in situ to form a soil plug. On the one hand, it is green and environmentally friendly to save construction materials and costs, and on the other hand, it can effectively improve the quality of the formed soil plug and further improve the bearing capacity of the large-diameter bridge pipe pile 1.

[0024] In the specific implementation of this embodiment: Figure 4 As shown, the slurry inlet pipe 22 is located at the center of the hammer grouting body 2, and a plurality of slurry outlet pipes 21 are arranged in a circular array to ensure that the slurry can be completely absorbed.

[0025] The outer contour size of the transmission cylinder 3 is larger than the outer contour size of the soil-penetrating grouting body 4, and the grouting pipe 31 arranged on the transmission cylinder 3 is located at a part of the transmission cylinder 3 that is larger than the soil-penetrating grouting body 4. The plurality of grouting pipes 31 are arranged in a circumferential array, and the number and position of the plurality of grouting pipes 31 correspond to the number and position of the plurality of grouting pipes 21 one by one.

[0026] Combination Figure 1 and Figure 4 As shown, a plurality of grouting pipes 41 are evenly arranged in a scattered manner along the cross-sectional direction of the through-soil grouting body 4. At the same time, a plurality of grouting pipes 41 are evenly arranged at intervals along the height direction of the through-soil grouting body 4. Each grouting pipe 41 is connected to the grouting inlet pipe 22 penetrated in the center to ensure the uniformity of the grouting.

[0027] Although the above embodiments have described the concepts and embodiments of the present invention in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and changes can still be made to the present invention without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A construction method for large-diameter bridge pipe piles based on soil plug effect, characterized in that: The construction method comprises the following steps: A hammer grouting body, a transmission cylinder and a soil-penetrating grouting body are arranged inside the large-diameter bridge pipe pile, wherein the transmission cylinder is arranged at the bottom of the hammer grouting body, the soil-penetrating grouting body is arranged at the bottom of the transmission cylinder, the hammer grouting body is provided with a grouting outlet pipe and a grouting inlet pipe, the transmission cylinder is provided with a grouting suction pipe, the grouting suction pipe is connected to the grouting outlet pipe, the soil-penetrating grouting body is provided with a grouting injection pipe, the grouting injection pipe is connected to the grouting inlet pipe, and the outer end opening of the grouting injection pipe is arranged on the outer wall of the soil-penetrating grouting body; During the sinking process of the large-diameter bridge pipe pile, the grout inlet pipe is connected to a high-pressure water supply device, the grout injection pipe sprays high-pressure water through the high-pressure water supply device to destroy the soil plug and form mud, and the grout outlet pipe is connected to a mud suction device to suck mud through the grout suction pipe; Hammering the hammer grouting body to form a guide hole below the large-diameter bridge pipe pile through the soil penetration grouting body; The grout inlet pipe is externally connected to a slurry injection device, and grouting is performed through the grouting pipe to form a soil plug inside the large-diameter bridge pipe pile and the guide hole.

2. The construction method of large-diameter bridge pipe piles based on soil plug effect according to claim 1 is characterized by: The outer contour size of the transmission cylinder is larger than the outer contour size of the soil-penetrating grouting body, and the grouting pipe arranged on the transmission cylinder is located at a part of the transmission cylinder that is larger than the soil-penetrating grouting body.

3. The construction method of large-diameter bridge pipe piles based on soil plug effect according to claim 1 is characterized by: Along the cross-sectional direction of the soil-penetrating grouting body, a plurality of grouting pipes are evenly arranged in a scattered manner.

4. The construction method of large-diameter bridge pipe piles based on soil plug effect according to claim 1 is characterized by: Along the height direction of the soil-penetrating grouting body, a plurality of grouting pipes are evenly arranged at intervals.

5. The construction method of large-diameter bridge pipe piles based on soil plug effect according to claim 1, characterized in that: The slurry sucked by the grout suction pipe is retained in situ, and then injected back into the large-diameter bridge pipe pile and the guide hole through the grout inlet pipe and the grout injection pipe.

6. The construction method of large-diameter bridge pipe piles based on soil plug effect according to claim 5 is characterized by: After the slurry is sucked, an admixture is added into the slurry, and then the slurry is injected back into the large-diameter bridge pipe pile and the guide hole through the slurry inlet pipe and the slurry injection pipe.

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