A water blocking structure for a T-shaped joint part of an underground continuous wall and a construction method thereof

Abstract

The application discloses a kind of underground continuous wall T-shaped joint part water plugging structure, belong to underground construction engineering technical field, including rotary jetting pile, support assembly, grouting pipe, wherein rotary jetting pile is set to one side of T-shaped joint part, T-shaped joint part includes head and the bottom perpendicular to head, rotary jetting pile is set to one side of head away from bottom;Support assembly is simultaneously connected with bottom and head, support assembly is equipped with two groups, and is respectively set to the two sides of bottom, and cavity for accommodating filler is equipped in support assembly;One end of grouting pipe penetrates support assembly and extends into cavity, and the other end is connected with grouting equipment.The application also provides a kind of underground continuous wall T-shaped joint part water plugging structure construction method solves the T-shaped joint part due to the structure special, often appears multiple-point seepage and sustained seepage problem, the effect of conventional grouting water plugging measure is not good problem, effect is remarkable, is suitable for widely promoting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground construction engineering, in particular to a water blocking structure and construction method for a T-shaped joint part of an underground continuous wall. BACKGROUND

[0002] The underground continuous wall is a foundation engineering that uses a kind of trenching machinery on the ground, along the axis of the deep excavation engineering, under the condition of mud protection wall, a long and narrow deep trench is excavated, after cleaning the trench, the reinforcement cage is hoisted into the trench, then the guide pipe method is used to pour and build underwater concrete to form a unit trench section, and this is done segment by segment, to build a continuous reinforced concrete wall underground, as a water interception, anti-seepage, load-bearing and water retaining structure.

[0003] Nowadays, the T-shaped joint part of the underground continuous wall often has the problems of multi-point water leakage and continuous water leakage due to its special structure, and the effect of the conventional grouting water blocking measures is often not good, therefore, it is necessary to invent a water blocking structure and construction method for the T-shaped joint part of the underground continuous wall to overcome the defects in the prior art. SUMMARY

[0004] In view of the above-mentioned defects, the technical problem solved by the present application is to provide a water blocking structure and construction method for the T-shaped joint part of the underground continuous wall to solve the problems of multi-point water leakage and continuous water leakage at the T-shaped joint part due to its special structure, and the poor effect of the conventional grouting water blocking measures.

[0005] The present application provides a water blocking structure for the T-shaped joint part of the underground continuous wall, comprising:

[0006] A jet grouting pile is arranged on one side of the T-shaped joint part, the T-shaped joint part comprises a head part and a bottom part perpendicular to the head part, a first turning area is formed between one side of the bottom part and the head part, a second turning area is formed between the other side of the bottom part and the head part, and the jet grouting pile is arranged on the side of the head part away from the bottom part;

[0007] A support assembly is connected with the bottom part and the head part at the same time, the support assembly is provided with two groups and arranged on both sides of the bottom part, a cavity for accommodating a filling material is arranged in the support assembly, and the filling material is used for water blocking of the T-shaped joint part;

[0008] A grouting pipe is arranged, one end of the grouting pipe penetrates through the support assembly and extends into the cavity, the other end of the grouting pipe is connected with a grouting device, and the grouting pipe is used for injecting grouting slurry into the cavity.

[0009] Preferably, the support assembly comprises a plurality of support units, and each support unit comprises:

[0010] A first fixed support plate is connected with the head part;

[0011] A second fixed support plate is connected with the bottom and the first fixed support plate;

[0012] A horizontal support plate is connected with the first fixed support plate and the second fixed support plate, and the horizontal support plate is provided with two horizontal support plates symmetrically arranged on both sides of the first fixed support plate and the second fixed support plate;

[0013] A vertical support plate is connected with the first fixed support plate, the second fixed support plate and the two horizontal support plates, and the first fixed support plate, the second fixed support plate, the two horizontal support plates and the vertical support plate form the cavity.

[0014] Preferably, a plurality of grouting holes are arranged on the grouting pipe, and the part of the grouting pipe provided with the grouting holes extends into the cavity.

[0015] Preferably, the horizontal support plate is a triangular plate, and the support unit is a triangular prism structure.

[0016] Preferably, a plurality of rotary jet piles are arranged side by side along the arrangement direction of the head.

[0017] The application also provides a construction method of a water plugging structure of a T-shaped joint part of an underground continuous wall, which applies the water plugging structure of the T-shaped joint part of the underground continuous wall according to any one of the above.

[0018] Step 1: a plurality of rotary jet piles are arranged side by side outside the T-shaped joint part of the underground continuous wall, and the length and position of the rotary jet pile are determined according to the leakage point.

[0019] Step 2: a plurality of support units are welded inside the leakage area of the underground continuous wall, and during the construction process, the cavity is filled with bentonite before the cavity is closed, and a certain length of the grouting pipe is pre-buried.

[0020] Step 3: grouting is performed in the cavity through the reserved grouting pipe, and under the action of the grouting pressure, the slurry in the bentonite after water absorption generates filling, penetration, compaction and splitting flow, and part of the slurry penetrates into the T-shaped joint part of the underground continuous wall.

[0021] Preferably, the method further comprises: step 4: after grouting, if it is observed that there is still leakage in the local leakage area, the support unit corresponding to the area is subjected to multiple grouting operations until no leakage is observed.

[0022] Preferably, the slurry injected in step 3 is modified ultra-fine cement grouting slurry.

[0023] From the above scheme, the underground continuous wall T-shaped joint part water plugging structure and construction method provided by the application has the following advantages: 1. The water stop structure of the joint part is simple and convenient to construct; 2. The 'inside and outside combined' water plugging method is adopted for the leakage part of the underground continuous wall joint, which can effectively solve the problems of multi-point leakage and multiple leakage of water at the T-shaped joint part. The application solves the problems of multi-point leakage and continuous leakage of water at the T-shaped joint part due to the special structure, and the effect of the conventional grouting water plugging measure is not good, the effect is remarkable, and it is suitable for wide promotion. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0025] Fig. 1 The structural diagram of the support assembly of the underground continuous wall T-shaped joint part water plugging structure provided by the application is shown in the figure.

[0026] Fig. 2 The structural diagram of the underground continuous wall T-shaped joint part water plugging structure provided by the application is shown in the figure.

[0027] Fig. 3 The structural diagram of another underground continuous wall T-shaped joint part water plugging structure provided by the application is shown in the figure.

[0028] Figs. 1-3 In the figure:

[0029] 1, rotary jet pile; 2, support assembly; 3, grouting pipe; 4, head; 5, bottom; 21, first fixed support plate; 22, second fixed support plate; 23, horizontal support plate; 24, vertical support plate; 25, cavity; 26, expansion unit; 31, grouting hole. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0031] Please refer to Figs. 1 to 2, a specific embodiment of a water blocking structure of a T-shaped joint part of an underground continuous wall provided by the present application will be described. The water blocking structure of the T-shaped joint part of the underground continuous wall comprises a jet grouting pile 1, a support assembly 2, and a grouting pipe 3. The jet grouting pile 1 is arranged at one side of the T-shaped joint part. The T-shaped joint part comprises a head part 4 and a bottom part 5 perpendicular to the head part 4. A first turning area is formed between one side of the bottom part 5 and the head part 4. A second turning area is formed between the other side of the bottom part 5 and the head part 4. The jet grouting pile 1 is arranged at a side of the head part 4 away from the bottom part 5. The support assembly 2 is connected with the bottom part 5 and the head part 4 simultaneously. The support assembly 2 is provided with two groups of support units and is arranged at two sides of the bottom part 5, i.e., the first turning area and the second turning area. The support assembly 2 is provided with a cavity 25 for accommodating a filler. The filler is used for water blocking of the T-shaped joint part. The filler can be bentonite. One end of the grouting pipe 3 penetrates through the support assembly 2 and extends into the cavity 25. The other end of the grouting pipe 3 is connected with a grouting device and is used for injecting grout into the cavity 25.

[0032] Compared with the prior art, the water blocking structure of the T-shaped joint part of the underground continuous wall realizes synchronous water stopping of the inside and outside of the T-shaped joint part through the cooperation of the jet grouting pile 1 and the support assembly 2, and the water stopping effect is better. Through the arrangement of the pre-buried grouting pipe 3, the grouting amount and the grouting frequency can be adjusted according to the grouting and water blocking condition, and the problem of waste of materials or poor water stopping effect after one-time grouting can be avoided.

[0033] As another embodiment of the present application, the structure of the water blocking structure of the T-shaped joint part of the underground continuous wall is basically the same as that in the above embodiment. The difference lies in that the support assembly 2 comprises a plurality of support units. The support unit comprises a first fixed support plate 21, a second fixed support plate 22, a horizontal support plate 23, and a vertical support plate 24. The first fixed support plate 21 is connected with the head part 4. The second fixed support plate 22 is connected with the bottom part 5 and the first fixed support plate 21 simultaneously. The horizontal support plate 23 is connected with the first fixed support plate 21 and the second fixed support plate 22 simultaneously. The horizontal support plate 23 is provided with two horizontal support plates and is symmetrically arranged at two sides of the first fixed support plate 21 and the second fixed support plate 22. The vertical support plate 24 is connected with the first fixed support plate 21, the second fixed support plate 22, and the two horizontal support plates 23 simultaneously. The first fixed support plate 21, the second fixed support plate 22, the two horizontal support plates 23, and the vertical support plate 24 form the cavity 25. The first fixed support plate 21 and the second fixed support plate 22 are connected and fixed with the head part 4 and the bottom part 5 respectively. Then the vertical support plate 24 and the horizontal support plate 23 are installed. This arrangement can better fit the structure of the T-shaped joint part, the water blocking and sealing effect is better, and the adaptability of the support assembly 2 is better.

[0034] As another embodiment of the present application, the structure of the underground continuous wall T-shaped joint part water plugging structure is basically the same as that in the above embodiment, and the difference is that the grouting pipe 3 is provided with a plurality of grouting holes 31, the part of the grouting pipe 3 provided with the grouting holes 31 extends into the cavity 25, and the slurry flows out of the grouting holes 31 and penetrates into the filler during the grouting process. The grouting pipe 3 is vertically arranged on the vertical support plate 24 and is provided with a plurality of grouting pipes 3 arranged side by side along the arrangement direction of the vertical support plate 24, the distance of the grouting pipe 3 on the vertical support plate 24 extending into the cavity 25 is long in the middle and short on both sides, that is, the grouting holes 31 are evenly arranged in the cavity 25 as much as possible, so that the grouting efficiency is higher.

[0035] In the embodiment, the horizontal support plate 23 is a triangular plate; the support unit is a three-prism structure which can well fit the T-shaped joint part, the support unit is used for containing the filler and limiting the diffusion range of the slurry, so as to ensure that the slurry solidifies at the water leakage position to achieve the water blocking effect. Here, as long as the support unit can achieve the above-mentioned performance effect, it is within the scope of protection of the present application.

[0036] In the embodiment, the rotary jet pile 1 is provided with a plurality of rotary jet piles 1 arranged side by side along the arrangement direction of the head 4, and the plurality of rotary jet piles 1 can cover the water leakage position in all directions to waterproof the water leakage position.

[0037] Please refer to Figs. 1 to 3 , as another embodiment of the present application, the structure of the underground continuous wall T-shaped joint part water plugging structure is basically the same as that in the above embodiment, and the difference is that the vertical support plate 24 is a circular arc structure recessed towards the cavity 25, which can cover a larger area of the T-shaped joint part, expand the waterproof area, and at the same time, appropriately reduce the unnecessary waste of materials in the middle area, so as to make the use efficiency of the materials higher.

[0038] In the embodiment, the support unit further includes an expansion unit 26, the cross section of the expansion unit 26 is arc-shaped, the expansion unit 26 includes a first expansion part, a second expansion part, a third expansion part and a fourth expansion part, the first expansion part is connected with the head 4 and the vertical support plate 24 at the same time; the second expansion part is connected with the bottom 5 and the vertical support plate 24 at the same time; the third expansion part is connected with the first expansion part and the second expansion part at the same time, and the grouting pipe 3 penetrates through the third expansion part; the fourth expansion part is provided with two and arranged on both sides of the vertical support plate 24, and the fourth expansion part is connected with the first expansion part, the second expansion part, the third expansion part and the vertical support plate 24 at the same time, the first expansion part, the second expansion part, the third expansion part, the fourth expansion part and the vertical support plate 24 form an expansion cavity, and the expansion cavity is also provided with a filler.

[0039] In the embodiment, the third extension part is a circular arc structure concentric with the vertical support plate 24. The vertical support plate 24 is provided with a pressure sensor on the side close to the third extension part. The pressure sensor is used to detect the pressure state of the two sides of the vertical support plate 24 during and after the grouting process, so as to determine whether the injection amount of the slurry meets the standard. During grouting, the slurry enters the extension cavity and the cavity 25 at the same time. When the pressure sensor detects that the pressure values of the two sides of the vertical support plate 24 reach a certain value, the grouting is stopped. If there is still water leakage, the grouting is continued until the pressure sensor reaches the next standard value, and then the grouting is stopped until complete waterproofing. The setting of the extension unit 26 can form a two-layer protection on the outside of the vertical support plate 24. The vertical support plate 24 blocks part of the water-blocking material, and the extension unit 26 blocks part of the water-blocking material. The vertical support plate 24 is reinforced. Even if the water-blocking effect of the material in the vertical support plate 24 decreases during a long period of use, water leakage will not occur. The water-blocking effect is better, and the service life is longer.

[0040] The construction method of the underground continuous wall T-shaped joint part water plugging structure according to any one of the above embodiments comprises the following specific steps:

[0041] S1, a plurality of rotary jet piles 1 are driven side by side on the outside of the T-shaped joint part of the underground continuous wall. The size of the rotary jet pile 1 can be Ф600*400. The length and position of the rotary jet grouting section are determined according to the water leakage point.

[0042] S2, a plurality of support units are welded on the inside of the water leakage area of the underground continuous wall. The support units are welded with the steel bars of the underground continuous wall. During construction, the cavity 25 is filled with bentonite before it is closed, and a certain length of grouting pipe 3 is embedded.

[0043] The specific steps of S2 can be: first, the first fixed support plate 21 and the second fixed support plate 22 are fixed to the head 4 and the bottom 5 respectively and welded together. Then, the vertical support plate 24 and one of the horizontal support plates 23 are welded with the first fixed support plate 21 and the second fixed support plate 22. The cavity 25 formed between the vertical support plate 24, the horizontal support plate 23, the first fixed support plate 21 and the second fixed support plate 22 is filled with bentonite. The part of the grouting pipe 3 provided with the grouting hole 31 is inserted into the bentonite. The position where the grouting pipe 3 contacts with the vertical support plate 24 is welded and fixed. Finally, the other horizontal support plate 23 is welded with the vertical support plate 24, the first fixed support plate 21, the second fixed support plate 22. The vertical support plate 24, the horizontal support plate 23, the first fixed support plate 21 and the second fixed support plate 22 can all be steel plates with a thickness of 10 mm. The grouting pipe 3 can be a grouting steel pipe with a diameter of Ф25. The grouting hole 31 can be a Ф6 overflow hole arranged in a quincunx shape.

[0044] S3, grouting into the cavity 25 through the reserved grouting pipe 3, under the action of grouting pressure, the slurry in the bentonite after absorbing water produces filling, penetration, compaction, splitting flow, and part of the slurry penetrates into the T-shaped joint part of the underground continuous wall.

[0045] The slurry injected in S3 is modified ultra-fine cement grouting slurry.

[0046] S4, after grouting, if it is observed that there is still seepage water in the local seepage area, the support unit corresponding to the area is subjected to multiple grouting operations until no seepage water is observed.

[0047] Compared with the prior art, the underground continuous wall T-shaped joint part water plugging structure and construction method provided by the present application has the following advantages: 1. The water stop structure of the joint part is simple and convenient to construct; 2. The 'inside and outside combined' water plugging method is adopted for the seepage part of the underground continuous wall joint, which can effectively solve the problems of multiple point seepage water and multiple seepage water of the T-shaped joint part. It should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. The contents not described in detail in the embodiments of the present application are the prior art known to those skilled in the art.

[0049] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A water blocking structure for a T-joint portion of an underground continuous wall, characterized by, include: A jet grouting pile (1) is set on one side of a T-shaped joint. The T-shaped joint includes a head (4) and a bottom (5) perpendicular to the head (4). A first turning zone is formed between one side of the bottom (5) and the head (4), and a second turning zone is formed between the other side of the bottom (5) and the head (4). The jet grouting pile (1) is set on the side of the head (4) away from the bottom (5). The support assembly (2) is connected to both the bottom (5) and the head (4). The support assembly (2) has two sets, which are respectively located on both sides of the bottom (5). The support assembly (2) has a cavity (25) for accommodating filler, which is used to block water at the T-shaped joint. The grouting pipe (3) has one end that passes through the support assembly (2) and extends into the cavity (25), and the other end that is connected to the grouting equipment for injecting water-blocking grout into the cavity (25); The support component (2) includes a plurality of support units, the support unit comprising: The first fixed support plate (21) is connected to the head (4); The second fixed support plate (22) is connected to both the bottom (5) and the first fixed support plate (21); A horizontal support plate (23) is connected to both the first fixed support plate (21) and the second fixed support plate (22). The horizontal support plate (23) has two parts and is symmetrically arranged on both sides of the first fixed support plate (21) and the second fixed support plate (22). The vertical support plate (24) is connected to the first fixed support plate (21), the second fixed support plate (22) and the two horizontal support plates (23), and the cavity (25) is formed between the first fixed support plate (21), the second fixed support plate (22), the two horizontal support plates (23) and the vertical support plate (24). The grouting pipe (3) is provided with a plurality of grouting holes (31), and the portion of the grouting pipe (3) with the grouting holes (31) extends into the cavity (25); The horizontal support plate (23) is a triangular plate; the support unit is a triangular prism structure.

2. The underground continuous wall T-joint part water plugging structure according to claim 1, characterized in that, Several jet grouting piles (1) are arranged side by side along the setting direction of the head (4).

3. A method of constructing a water blocking structure at a T-joint portion of a diaphragm wall, characterized by, The application of a water-blocking structure for the T-joint of a diaphragm wall as described in any one of claims 1-2 includes: Step 1: Drive several jet grouting piles (1) side by side into the outer side of the T-shaped joint of the underground diaphragm wall. The length and position of the jet grouting section are determined according to the leakage point. Step 2: Weld several support units on the inner side of the leaking area of ​​the underground continuous wall. During the construction process, before the cavity (25) of the support unit is closed, fill the cavity (25) with bentonite and pre-embed a certain length of the grouting pipe (3). Step 3: Grout is injected into the cavity (25) through the reserved grouting pipe (3). Under the action of grouting pressure, the grout fills, penetrates, compacts and splits in the bentonite after absorbing water, and some of the grout penetrates into the T-shaped joint of the underground continuous wall.

4. The construction method of the water-blocking structure at the T-joint of a diaphragm wall according to claim 3, characterized in that, It also includes step 4, after grouting, if water leakage is still observed in the local area of ​​the leakage area, then the support unit in the corresponding area is subjected to grouting operation multiple times until no water leakage is observed.

5. The construction method of the water-blocking structure at the T-joint of a diaphragm wall according to claim 4, characterized in that, The grout injected in step 3 is a modified ultrafine cement grout.

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