Underground diaphragm wall post-grouting anti-seepage device

Abstract

The utility model discloses a post-grouting anti-seepage device for an underground diaphragm wall, which comprises a grouting steel pipe welded at a corner of an I-shaped steel joint of the underground diaphragm wall. The grouting steel pipe comprises a seamless steel pipe, a grout outlet steel pipe and a sealing iron sheet, and the seamless steel pipe is a main body of the grouting steel pipe and forms a grouting main channel; the slurry outlet steel pipe is a branch pipe welded on the seamless steel pipe at a certain interval to form a slurry outlet; and the sealing iron sheet covers the outer side of the slurry outlet steel pipe through spot welding. The grouting steel pipes are pre-buried at the corners of the I-shaped steel, post-grouting is carried out after concrete pouring of the underground diaphragm wall is completed, and through mud joints which are not cleaned up in the I-shaped steel joints are blocked. The construction method is easy to operate, low in manufacturing cost, low in requirement for a construction site, high in reliability and good in grouting, water stopping, seepage preventing and leaking stoppage effects, the waterproofness of the I-shaped steel joint of the underground diaphragm wall can be effectively improved, and a powerful guarantee is provided for the safety of foundation pit construction.

Description

TECHNICAL FIELD

[0001] The utility model relates to underground engineering construction technical field especially relates to underground continuous wall anti -infiltration technology, specifically underground continuous wall post grouting anti -infiltration device and construction method, aiming at common underground continuous wall H -steel joint type, adopt the method of post grouting of pre -buried grouting steel pipe, effectively prevent and improve underground continuous wall joint leakage problem. BACKGROUND

[0002] Underground continuous wall is a kind of commonly used underground engineering technical means, is widely used in shield well, foundation pit, basement and other buildings.Underground continuous wall adjacent slot section joint type is more, wherein, H -steel joint can satisfy stress, water stop requirement simultaneously, and simple structure, therefore, application is more.But because of construction quality and construction technology and other factors, H -steel joint place is difficult to avoid because of one period slot section concrete flow, joint cleaning not thoroughly and appears mud phenomenon, leads to the existence of through mud joint at joint place after two period slot section pouring, thereby causes joint leakage water, and later plugging processing is difficult, brings hidden trouble for engineering safety.

[0003] For the leakage prevention and treatment measures of underground continuous wall H -steel joint, mainly have rotary jet pile water stop curtain, grouting method etc., but is influenced by geological soil layer, reinforcement depth etc., and waterproof effect is difficult to guarantee, and construction operation is complex, and cost is higher, and often because of objective reason leads to the poor implementation effect. UTILITY MODEL CONTENT

[0004] In order to solve the problems in the prior art, the utility model provides a kind of underground continuous wall H -steel joint anti -infiltration device and construction method that construction is convenient, easy operation, preburies grouting pipe at H -steel corner, and carries out post grouting after underground continuous wall concrete pouring is completed.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A kind of underground continuous wall post grouting anti -infiltration device, including grouting steel pipe, the grouting steel pipe is welded at the corner of underground continuous wall H -steel joint, and is preburied into slot section along with underground continuous wall reinforcement cage, H -steel joint;The grouting steel pipe includes seamless steel pipe, grout outlet steel pipe, sealing sheet iron;The seamless steel pipe is the main body of grouting steel pipe, forms grouting main channel;The grout outlet steel pipe is the branch pipe welded at a certain distance on the seamless steel pipe, forms grout outlet;The sealing sheet iron is covered on the outside of the grout outlet steel pipe by spot welding, prevents concrete from pouring in and causing blockage when one period slot section is constructed.

[0007] Further, the grouting steel pipe is preburied at the corner of first-pouring slot section on the soil side of H -steel joint, to prevent adverse effects on the brushing wall of post-pouring slot section.

[0008] Further, the seamless steel pipe adopts a hot-rolled seamless steel pipe, the top part exceeds the underground continuous wall, the later exceeding part is cut off, the bottom part extends below the structure bottom plate to form a main grouting passage.

[0009] Further, the outlet of the grouting steel pipe is sealed by a waterproof tape, the grouting steel pipe is provided with a round hole at the corresponding position of the I-beam web and exposes the I-beam, and the gap between the grouting steel pipe and the I-beam is tightly plugged by geotextile.

[0010] The construction method comprises the following steps:

[0011] S1, grouting steel pipe processing: the grouting steel pipe adopts a hot-rolled seamless steel pipe, the top part exceeds the underground continuous wall by 50 cm, the later exceeding part is cut off, and the bottom part extends below the structure bottom plate by 3 m; the grouting steel pipe is welded to the I-beam side at a distance of 3 m, the outlet of the grouting steel pipe is sealed by a waterproof tape, and the outside is covered by spot-welded sealing iron sheets to prevent pouring during concrete pouring.

[0012] S2, grouting steel pipe and I-beam welding: the grouting steel pipe is welded at the corner of the water-facing side of the I-beam joint first-stage slot section and is spot-welded to the I-beam and the underground continuous wall reinforcement, a round hole is reserved at the corresponding position of the I-beam web, the grouting steel pipe exposes the I-beam by 5 mm, and the gap between the grouting steel pipe and the I-beam is tightly plugged by geotextile.

[0013] S3, water opening: 1-2 days after the concrete pouring of the underground continuous wall is completed, the grouting steel pipe is connected to the pressure grouting machine by a pressure pipe, and water is used for sectional opening, each section is 2 m long; the opening pressure is 1.0-2.0 MPa, and when the pressure suddenly drops and water can continuously be injected, it is indicated that the opening is successful.

[0014] S4, grouting: sectional grouting is performed from bottom to top by using a double plug core pipe, each grouting section is 3 m long, the grouting material is 1:1 cement slurry, the initial pressure of the grouting pressure is temporarily set to 0.5-1 MPa, the final pressure is temporarily set to 1.5 MPa, and appropriate adjustment can be made according to the on-site test; under the maximum design pressure of the grouting section, the injection rate is not greater than 1 L / min, and grouting is continued for 30 min, and the grouting can be ended. When the grouting pressure reaches 80% of the final pressure, a larger grout loss occurs, and intermittent grouting should be used, and the intermittent time is preferably 30-60 min, or the water-cement ratio of the slurry is adjusted.

[0015] S5, grouting steel pipe plugging: after the grouting is completed, the grouting steel pipe is filled with M10 cement mortar.

[0016] The utility model discloses the beneficial effect is:

[0017] The utility model discloses the device structure is simple, easy manufacturing, and reliable with I-beam joint connection, and the cost is low.

[0018] The construction method is simple in operation, the grouting steel pipe is pre-buried and high in reliability, is not affected by geological conditions and reinforcing depth, is low in requirement for a construction site, is good in grouting effect, is good in water stopping, seepage preventing and leakage stopping effect, can effectively block the penetrating mud joint in the I-shaped steel joint, improves the water resistance of the underground continuous wall I-shaped steel joint, and provides powerful guarantee for the safety of foundation pit construction. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 is a structure schematic view of the grouting steel pipe of the utility model embodiment;

[0020] Fig. 2 is a transverse section structure schematic view of the pre-buried grouting steel pipe of the utility model;

[0021] Fig. 3 is a detailed view of the connection of the grouting steel pipe and the I-shaped steel of the utility model;

[0022] Fig. 4 is a sealing schematic view of the grouting hole of the utility model.

[0023] In the drawing: 1-seamless steel pipe; 2-grouting steel pipe; 3-I-shaped steel; 4-sealing iron sheet; 5-underground continuous wall steel bar. DETAILED DESCRIPTION

[0024] The technical scheme of the utility model will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0025] The utility model provides a kind of underground continuous wall post-grouting seepage prevention device, to overcome the defects of prior art, improve the water resistance of underground continuous wall I-shaped steel joint.

[0026] As Figs. 1-4As shown, the utility model discloses a kind of underground continuous wall post grouting anti-seepage devices, mainly by seamless steel pipe 1, out of paste steel pipe 2, sealing iron sheet 4 composition.Seamless steel pipe 1 adopts φ89x4mm grouting pipe, top exceeds underground continuous wall 50cm, later excess part cuts off, bottom extends 3m below structure bottom plate, forms grouting main passage;Out of paste steel pipe 2 adopts φ20x1.5mm steel pipe, interval 3m is set in seamless steel pipe, forms paste outlet, out of paste steel pipe 2 export is sealed with waterproof tape, out of paste steel pipe 2 needs to be reserved round hole at the corresponding position of web of I-beam 3, and expose I-beam 3, expose length is 5mm, the gap of out of paste steel pipe 2 and I-beam 3 is tightly plugged with geotextile;Sealing iron sheet 4 adopts 1mm thick thin iron sheet, is covered outside out of paste steel pipe 2 by spot welding, prevent concrete pouring into and cause blockage when first-stage slot section construction.Seamless steel pipe 1 is embedded in slot section with underground continuous wall reinforcement cage, I-beam joint.

[0027] The construction method of the utility model device mainly includes the following steps:

[0028] S1, grouting steel pipe processing: grouting steel pipe adopts a hot-rolled seamless steel pipe 1, top exceeds underground continuous wall 50cm, later excess part cuts off, bottom extends 3m below structure bottom plate;Pipe wall is close to I-beam 3 side weld out of paste steel pipe 2, interval 3m, grouting steel pipe export is sealed with waterproof tape, outside adopts sealing iron sheet 4 spot welding cover.

[0029] S2, grouting steel pipe and I-beam welding: grouting steel pipe is welded in I-beam joint first-stage slot section side water-facing corner, and is spot-welded with I-beam 3 and underground continuous wall reinforcement 5, out of paste steel pipe 2 needs to be reserved round hole at the corresponding position of web of I-beam 3, and expose I-beam 3, expose length is 5mm, the gap of out of paste steel pipe 2 and I-beam 3 is tightly plugged with geotextile.

[0030] S3, clear water unblock: after underground continuous wall concrete pouring is finished 1~2d, grouting steel pipe is connected with pressure pipe and pressure grouting machine, and clear water is used to sectional unblock, and each section length is 2m;Unblock pressure is 1.0~2.0MPa, when pressure drops sharply and water can continuously inject, it is explained that unblock is successful.

[0031] S4, grouting: adopt double plug core pipe from bottom to top sectional grouting, and each grouting length is 3m.Grouting material adopts 1:1 cement paste, grouting pressure initial pressure is tentatively 0.5MPa~1MPa, final pressure is tentatively 1.5MPa, and can be appropriately adjusted according to on-site test;Under the maximum design pressure of this grouting section, injection rate is not more than 1L / min, then continue grouting 30min, and grouting can be ended.When grouting pressure reaches 80% of final pressure, larger grouting appears, should be changed into intermittent grouting, and intermittent time is preferably 30~60min, or lower slurry water-cement ratio.

[0032] S5, grouting steel pipe plugging: after grouting, fill the grouting steel pipe with M10 cement mortar.

[0033] The above merely illustrates the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A diaphragm wall post grouting anti-seepage device, characterized in that: The injection steel pipe is welded at the corner of the underground continuous wall H-shaped steel joint, and is pre-buried in the groove section together with the underground continuous wall reinforcement cage and the H-shaped steel joint; the injection steel pipe comprises a seamless steel pipe, a grout outlet steel pipe and a sealing iron sheet; the seamless steel pipe is the main body of the injection steel pipe and forms a main grouting channel; the grout outlet steel pipe is a branch pipe welded on the seamless steel pipe at a certain distance and forms a grout outlet; and the sealing iron sheet is covered on the outside of the grout outlet steel pipe by spot welding to prevent the concrete from being poured into the grout outlet steel pipe and causing blockage during the construction of the first-stage groove section.

2. The diaphragm wall post-grouting anti-seepage device according to claim 1, characterized in that: The injection steel pipe is pre-buried at the corner of the first-poured groove section on the soil-facing side of the H-shaped steel joint to prevent the adverse effect on the wall brushing of the later-poured groove section.

3. The diaphragm wall post-grouting anti-seepage device according to claim 1, characterized in that: The seamless steel pipe adopts a hot-rolled seamless steel pipe, the top of which exceeds the underground continuous wall, the excess part is cut off in the later period, and the bottom extends below the structure bottom plate to form a main grouting channel.

4. The diaphragm wall post-grouting anti-seepage device according to claim 1, characterized in that: The outlet of the grout outlet steel pipe is sealed by a waterproof adhesive tape, the grout outlet steel pipe is provided with a round hole at the corresponding position of the H-shaped steel web and exposes the H-shaped steel, and the gap between the grout outlet steel pipe and the H-shaped steel is filled with geotextile.

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