SMW method pile-based deep foundation pit leakage stopping construction method

Abstract

The application discloses a deep foundation pit leakage stopping construction method based on a SMW method pile and concretely relates to the field of building foundation engineering. The first steel pipe is inserted into the leakage position of the outer wall of the deep foundation pit to drain the water, the second water outlet pipe is inserted into the first steel pipe to carry out secondary drainage treatment on the leakage position, the first steel pipe is taken as the center point of the quadrangle to weld the corner steel, the welding steel bars are used to connect the edges, the third water outlet pipe is inserted into the second water outlet pipe when the water flow decreases to the second preset water flow, the concrete is used to fill the gap between the steel and the steel plate, and the third water outlet pipe is blocked by the concrete when the leakage of the outer wall of the deep foundation pit stops. The water flow is reduced by the three-stage drainage method, the leakage amount is prevented from being too large when the leakage is stopped at one time, the equipment is prevented from collapsing, and the safety of the deep foundation pit leakage stopping is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building foundation engineering, in particular to a deep foundation pit leakage plugging construction method based on SMW method pile. BACKGROUND

[0002] With the progress of the times, the height and depth of the building are also continuously increasing, resulting in the increasing depth of the foundation pit, and thus the increasing leakage problem of the deep foundation pit. If the leakage problem of the deep foundation pit is not timely treated, it is easy to cause the collapse of the foundation pit. However, at present, the leakage is directly plugged by using concrete, but this single treatment method cannot solve the problem when the foundation pit is deep, the soil quality is poor, and the underground water is rich. The leakage of the foundation pit will cause the underground water to seep into the foundation pit, and thus the underground water level in the foundation pit is increased. The increase of the underground water level may affect the drainage effect of the foundation pit, increase the construction risk, and even make the foundation pit engineering unable to proceed normally. In addition, the leakage flow will have a scouring effect on the soil, resulting in the liquefaction and damage of the soil. Especially when the leakage flow is large, the stability of the soil is reduced, and the collapse risk of the foundation pit is increased. The leakage of the foundation pit may also cause the damage of the underground pipeline, and cause various problems such as accident hazards. Therefore, it is particularly important to solve the leakage problem of the deep foundation pit for the construction. SUMMARY

[0003] The present application solves the technical problem of the prior art, and provides a deep foundation pit leakage plugging construction method based on SMW method pile. On the basis of the SMW method pile, the water discharge is reduced by the three-stage drainage, and then the leakage is plugged by the concrete, thereby improving the safety of the deep foundation pit leakage plugging, and enabling the continuous dewatering and leakage plugging of the deep foundation pit.

[0004] The technical scheme adopted by the present application to solve the above technical problem is as follows: a deep foundation pit leakage plugging construction method based on SMW method pile, characterized by comprising the following steps:

[0005] S1: inserting a first steel pipe into the leakage position of the outer wall of the deep foundation pit for leakage drainage, and filtering the mud at the leakage position by a filter screen;

[0006] S2: inserting a second water outlet pipe into the first steel pipe for secondary drainage treatment of the leakage position, and entering the next step when the water flow is reduced to a first preset water flow;

[0007] S3: welding a steel at the corners of the first steel pipe inserted into the deep foundation pit as a center point of a quadrangle, and connecting the lines of each side by welding a steel bar;

[0008] S4: Reinforce and gap filling treatment of the steel bar and the profile steel by pouring concrete, and insert the third water outlet pipe inside the second water outlet pipe when the water flow is reduced to the second preset water flow;

[0009] S5: Insert the third water outlet pipe into the water outlet hole of the steel plate, and weld the end points of each profile steel to the steel plate to fill the gap between the profile steel and the steel plate with concrete pouring;

[0010] S6: When the leakage of the outer wall of the deep foundation pit stops, the third water outlet pipe is sealed by concrete.

[0011] Further, the filtering treatment in the S1 step filters the leakage mud through the superposition of multiple layers of filter screens.

[0012] Further, the mud is treated by filtering and stacking to plug the leakage point.

[0013] Further, in the S2 step, the profile steel is welded and reinforced on the first steel pipe by the steel bar.

[0014] Further, in the S4 step, the excess length of the second water outlet pipe is cut off after the reinforcement treatment.

[0015] Further, after the S6 step, the remaining water leakage at the leakage point is removed by the water pump, and the leakage point is sealed by concrete.

[0016] Further, the edges and the middle of the formwork are fixed by setting the specified wooden bars as back lath to meet the preset joint quality requirements.

[0017] Further, the gaps between the first steel pipe and the second water outlet pipe, and the gaps between the second water outlet pipe and the third water outlet pipe are compacted by concrete.

[0018] Compared with the prior art, the present application has at least the following beneficial effects:

[0019] (1) The deep foundation pit leakage construction method based on SMW method pile of the present application reduces the water quantity by three-stage drainage, prevents excessive penetration when plugging at one time, and improves the safety of deep foundation pit plugging.

[0020] (2) By being arranged on the SMW method pile, the leakage can be continuously dewatered and plugged to prevent secondary penetration. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a deep foundation pit leakage construction method based on SMW method pile;

[0022] Figure 2 Figure 1 is a sectional view of a deep foundation leakage plugging construction method based on SMW method piles;

[0023] Figure 3 Figure 2 is a front view of a deep foundation leakage plugging construction method based on SMW method piles. DETAILED DESCRIPTION

[0024] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the accompanying drawings, but the present application is not limited to these embodiments. Embodiment one

[0025] The embodiment provides a deep foundation leakage plugging construction method based on SMW method piles. In the SMW method pile construction, the drainage and waterproofing of groundwater need to be considered, and the leakage of the deep foundation needs to be promptly treated and monitored. As shown in Figure 1, the method comprises the steps of: Figures 1 to 3

[0026] S1: draining by inserting a first steel pipe at the leakage of the outer wall of the deep foundation, and filtering the mud at the leakage through a filter screen;

[0027] S2: performing secondary drainage treatment on the leakage by inserting a second water outlet pipe into the first steel pipe, and entering the next step when the water flow rate decreases to a first preset water flow rate;

[0028] S3: welding steel at the corners of the first steel pipe inserted into the deep foundation as the center point of a quadrilateral, and connecting each side line by welding steel bars;

[0029] S4: reinforcing and gap filling the steel bars and steel by pouring concrete, and inserting a third water outlet pipe into the second water outlet pipe when the water flow rate decreases to a second preset water flow rate;

[0030] S5: inserting the third water outlet pipe into the water outlet hole of the steel plate, and welding the end points of each steel to the steel plate to fill the gap between the steel and the steel plate with concrete pouring;

[0031] S6: when the leakage of the outer wall of the deep foundation stops, plugging the third water outlet pipe with concrete.

[0032] ​The SMW method pile construction is based on the design requirements and the size of the foundation pit, and the foundation pit excavation, slope treatment and underground pipeline migration are carried out. However, the deep foundation pit often has leakage phenomenon. After the SMW method pile construction is completed, the first steel pipe (S1) is inserted into the leakage position of the outer wall of the foundation pit to carry out the first leakage treatment. The first steel pipe (S1) used is a large-diameter steel pipe according to the corresponding leakage position, which can quickly and large-flux drain the leakage position. A filter screen (W1) is placed in the first steel pipe (S1) to filter the mud at the leakage position through the superposition of multiple filter screens (W1), so that the mud at the leakage position is filtered, and the filtered mud is accumulated in the inner ring of the first steel pipe (S1). The leakage at the leakage position can be treated and recycled. The second water outlet pipe (S2) is inserted into the first steel pipe (S1) to carry out the second drainage treatment operation. The diameter of the second water outlet pipe (S2) is smaller than that of the first steel pipe (S1). Since the length of the second water outlet pipe (S2) is generally 9 meters, the excess length of the second water outlet pipe (S2) is cut off according to the situation of the corresponding leakage position to prevent the leakage time from being too long. When the water flow rate decreases to the first preset water flow rate, the next step is entered. The first steel pipe (S1) inserted into the deep foundation pit is the midpoint of the quadrilateral, and the corner steel (G1) is welded, and the reinforcement steel is welded to connect each side line. The concrete is poured to reinforce and gap fill the steel (G1) and the steel. When the water flow rate decreases to the second preset water flow rate, the third water outlet pipe (S3) is inserted into the second water outlet pipe (S2). The third water outlet pipe (S3) is inserted into the water outlet hole (K1) of the steel plate, and the end points of each steel (G1) are welded with the steel plate to fill the gap between the steel (G1) and the steel plate with concrete. The diameter of the third water outlet pipe (S3) is smaller than the diameter of the second water outlet pipe (S2) and the diameter of the water outlet hole (K1) of the steel plate. Since the leakage position of the deep foundation pit will also have other leakage streams continuously leaking into the leakage position, the leakage position needs to be monitored to prevent large leakage from occurring inside. When the leakage position of the outer wall of the deep foundation pit stops leaking, the remaining water leakage is removed by the water pump, and the leakage position is sealed by the concrete. The excess concrete is scraped clean with a shovel to prevent excessive concrete accumulation from hindering later removal.

[0033] Further, in S2, the upper and lower steels of the first steel pipe are welded and reinforced by the reinforcement steel.

[0034] Since the first steel pipe (S1) is the first leakage treatment, the leakage amount of the leakage position is large. In order to ensure the safety of the leakage, the upper and lower steels (G1) are welded to reinforce the entire leakage device, prevent the first leakage from collapsing the device and aggravating the leakage of the leakage position, and thus cause harm.

[0035] Further, the concrete is used to compact the gaps between the first steel pipe and the second water outlet pipe and the gaps between the second water outlet pipe and the third water outlet pipe.

[0036] Since there are gaps between the steel pipe and the water outlet pipe, the concrete is used to compact the gaps between the pipes to prevent the leakage of the discharge from the gaps.

[0037] In summary, the deep foundation pit leakage plugging construction method based on the SMW method pile is used to insert the first steel pipe into the leakage position of the deep foundation pit, filter the mud at the leakage position through the filter screen, insert the second water outlet pipe into the first steel pipe to perform secondary drainage treatment on the leakage position, weld the steel plates at the corners of the quadrangle with the first steel pipe as the center, connect the edges through the welded steel bars, reinforce and gap fill the steel bars and the steel plates through the concrete pouring, insert the third water outlet pipe into the second water outlet pipe when the water flow decreases to the second preset water flow, insert the third water outlet pipe into the water outlet hole of the steel plate, weld the end points of the steel plates, fill the gap between the steel plates and the steel bars with the concrete pouring, and seal the third water outlet pipe with the concrete when the leakage of the deep foundation pit stops.

[0038] It should be noted that all the directional indications in the present application, such as up, down, left, right, front, back, etc., are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0040] In the present application, unless otherwise clearly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be internal connection of two elements or interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In addition, the technical solutions among various embodiments of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0042] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the scope defined by the spirit of the present application.

Claims

1. A deep foundation pit sealing construction method based on SMW method piles, characterized in that, Including the following steps: S1: The leakage is drained by inserting the first steel pipe into the leakage point on the outer wall of the deep foundation pit, and the mud at the leakage point is filtered by superimposing multiple layers of filter screens, so that the filtered mud accumulates in the inner circle of the first steel pipe for the purpose of plugging the leakage. S2: Secondary drainage is performed at the leakage point by inserting a second outlet pipe inside the first steel pipe, and the next step is initiated when the water flow rate drops to the first preset water flow rate. S3: Using the insertion point of the first steel pipe in the deep foundation pit as the center point of the quadrilateral, weld the steel sections at the corners and connect the edges by welding steel bars. S4: Reinforce the steel bars and structural steel by pouring concrete and fill the gaps, and insert the third outlet pipe inside the second outlet pipe when the water flow drops to the second preset water flow. S5: Insert the third water outlet pipe into the water outlet hole of the steel plate, and weld the ends of each steel section to the steel plate, and fill the gap between the steel section and the steel plate with concrete. S6: When the leakage at the outer wall of the deep foundation pit stops, the third water outlet pipe is sealed with concrete. Specifically, steel bars are welded to reinforce the upper and lower sections of the first steel pipe; and concrete is used to compact the gaps between the first steel pipe and the second water outlet pipe, and between the second water outlet pipe and the third water outlet pipe.

2. The deep foundation pit sealing construction method based on SMW pile method according to claim 1, characterized in that, In step S4, after the reinforcement and gap filling treatment, the excess length of the second water outlet pipe is cut off.

3. The deep foundation pit sealing construction method based on SMW pile method according to claim 1, characterized in that, After step S6, the remaining leaking water at the seepage point is removed by a water pump, and the seepage point is sealed with concrete.

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