Method for improving quality of H-shaped steel joint concrete of underground diaphragm wall

Abstract

The invention discloses a method for improving the quality of H-shaped steel joint concrete of an underground diaphragm wall, and belongs to the technical field of diaphragm wall construction, and the method comprises the following steps that vibrating equipment meeting the length within the range of 6 m from the ground to the excavation face of a foundation pit is customized, and the equipment length H is equal to the sum of the excavation depth of the foundation pit and 6 m; grooving and hole cleaning are conducted on the underground diaphragm wall according to the construction technology, and H-shaped steel and a reinforcement cage are hung and placed; a vibrator is lowered to the bottom of the foundation pit which is vertically placed close to one side of the H-shaped steel, and the distance h between the vibrator and the H-shaped steel is kept between 10 cm and 15 cm; and concrete pouring is started, when the concrete liquid level exceeds the top end of the vibrator, the concrete vibrator is started, and the vibrator and the concrete pouring guide pipe are lifted till concrete is poured to the top of the continuous wall. According to the method, while concrete is poured into the underground diaphragm wall, layered vibration is conducted on one side of the H-shaped steel through customized vibration equipment, the quality of concrete at the joint of the H-shaped steel of the underground diaphragm wall is improved, the later water leakage phenomenon is reduced, and the construction safety and reliability are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of continuous wall construction, and in particular relates to a method for improving the quality of H-shaped steel joint concrete of an underground continuous wall. Background Art

[0002] During the construction of underground continuous walls, concrete pouring is a particularly critical link in the construction quality control process. During the concrete pouring process, the H-shaped steel joints of underground continuous walls often become the weakest and most difficult to control part of the construction quality because the conduit is the farthest from the joint, and there are certain differences in the workability of engineering materials, and the proficiency of operators is uneven. Due to improper joint treatment, a channel for water leakage may be formed. Water leakage not only affects the waterproof performance of underground continuous walls, but also threatens the surrounding environment and structural safety. At present, the conventional method of controlling the quality of concrete at the joints of H-shaped steel of underground continuous walls is mainly to control the buried depth of the conduit during the pouring process, maintain a uniform pouring speed, and conduct mix ratio tests before construction to ensure that the strength and impermeability of concrete meet the requirements of the specifications. Although the effect is significant, the quality management staff has a large amount of input, mostly for the management of process acceptance during the construction process, and there are no specific measures to ensure the quality of concrete pouring at the joints. Especially under geological conditions with high pressure water, water leakage at the ground wall joints will have a greater impact on the quality and safety of the project. Summary of the invention

[0003] In view of this, the present invention provides a method for improving the quality of H-shaped steel joint concrete of underground continuous wall to solve the above problems.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A method for improving the quality of H-shaped steel joint concrete of underground continuous wall comprises the following steps:

[0006] S1. Before the construction of underground continuous wall, according to the design blueprint, the vibration equipment with a length of 6m below the ground to the excavation surface of the foundation pit shall be customized. The equipment length H = excavation depth of the foundation pit + 6m;

[0007] S2. According to the construction process, the underground continuous wall is grooved and cleaned, and the H-shaped steel and steel cage are suspended to complete the preparatory work before pouring;

[0008] S3. Lower the vibrator to the bottom of the foundation pit near the H-beam, and keep the distance between the vibrator and the H-beam at h = 10-15 cm;

[0009] S4. Start pouring concrete. When the concrete liquid level exceeds the top of the vibrator, turn on the concrete vibrator and lift the vibrator and concrete pouring pipe until the concrete is poured to the top of the continuous wall.

[0010] Further, in step S1, the customized vibrator is provided with an anti-floating weight, and the weight of the anti-floating weight is G=ρ 液 V 排 ρ 液 is the density of concrete, V 排 It is the volume of vibrator + anti-floating weight.

[0011] Further, in step S2, the steel cage is suspended between two adjacent H-shaped steels to form a construction section.

[0012] Furthermore, in step S4, when the mouth of the concrete pouring conduit is 6m higher than the end of the vibrator, the vibrator is lifted to perform layered vibration until the concrete is poured to the top of the continuous wall.

[0013] Furthermore, the thickness of each layer of layered vibration is ≤ 1.25 times the effective length of the vibrator, and the bottom end of the vibrator is inserted into the lower layer of concrete by 5-10 cm.

[0014] Furthermore, the vibration time of each layer is controlled within 20-30 seconds.

[0015] Further, in step S4, during the grouting and lifting process of the concrete pouring conduit, the distance between the top end of the vibrator and the opening of the concrete pouring conduit is not less than 2m and not more than 6m.

[0016] Further, steps S2-S4 are repeated to carry out construction of the next construction section.

[0017] The beneficial effects of the present invention are:

[0018] The present invention uses a customized vibrating device to perform layered vibration on one side of the H-steel while pouring concrete in the ground-connected wall, thereby improving the quality of concrete in the joints of the H-steel of the ground-connected wall, reducing the occurrence of water leakage in the later period, and improving the safety and reliability of construction. The present invention effectively reduces the occurrence of uncontrollable defects in the quality of the joints of the H-steel of the ground-connected wall caused by factors such as materials, personnel, and processes, effectively prevents problems such as structural water leakage and safety hazards, reduces construction costs, and has significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 The present invention is a process flow chart of a method for improving the quality of H-shaped steel joint concrete in underground continuous walls.

[0021] Figure 2 A construction plan view of a method for improving the quality of H-shaped steel joint concrete in underground continuous walls.

[0022] Figure 3 Schematic diagram of the initial placement of the vibrator.

[0023] Figure 4 Diagram of the relationship between the vibrator and the concrete pouring duct is shown to start lifting.

[0024] Figure 5 Schematic diagram of concrete being poured to the top of the continuous wall.

[0025] Among them, in the figure:

[0026] 1-H-shaped steel, 2-steel cage, 3-vibrator, 4-concrete pouring pipe. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Refer to the attached Figure 1-5 The present invention provides a method for improving the quality of H-shaped steel joint concrete of underground continuous wall, comprising the following steps:

[0029] S1. Before the construction of the underground continuous wall, a vibration device with a length from the ground to 6m below the foundation pit excavation surface is customized according to the design blueprint. The equipment length H = foundation pit excavation depth + 6m; the customized vibrator 3 is provided with an anti-floating counterweight, and the weight of the anti-floating counterweight G = ρ 液 V 排 ρ 液 is the density of concrete, V 排 It is the volume of vibrator 3 + anti-floating weight.

[0030] S2. According to the construction process, the underground continuous wall is grooved and cleaned, and the H-shaped steel 1 and the steel cage 2 are hoisted to complete the preparatory work before pouring; the steel cage 2 is hoisted between two adjacent H-shaped steels 1 to form a construction section;

[0031] S3. Lower the vibrator 3 to the bottom of the foundation pit near the side of the H-beam 1, and keep the distance between the vibrator 3 and the H-beam 1 between h = 10-15cm to prevent the vibrator 3 from affecting the steel cage 2;

[0032] S4. Start pouring concrete. When the concrete liquid level exceeds the top of the vibrator 3, turn on the concrete vibrator 3, and lift the vibrator 3 and the concrete pouring conduit 4. When the mouth of the concrete pouring conduit 4 is 6m higher than the end of the vibrator 3, start lifting the vibrator 3 to vibrate in layers until the concrete is poured to the top of the continuous wall. The thickness of each layer of layered vibration is ≤ 1.25 times the effective length of the vibrator 3, and the bottom end of the vibrator 3 is inserted into the lower layer of concrete for 5-10cm; the vibration time of each layer is controlled at 20-30 seconds; during the grouting and lifting process of the concrete pouring conduit 4, the distance between the top of the vibrator 3 and the mouth of the concrete pouring conduit 4 is not less than 2m, and not more than 6m;

[0033] S5. Repeat steps S2-S4 to carry out construction of the next construction section.

[0034] The above is only a specific embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

[0035] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0036] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for improving the quality of H-shaped steel joint concrete in underground continuous wall, characterized in that: The steps include: S1. Before the construction of underground continuous wall, according to the design blueprint, the vibration equipment with a length of 6m below the ground to the excavation surface of the foundation pit shall be customized. The equipment length H = excavation depth of the foundation pit + 6m; S2. According to the construction process, the underground continuous wall is grooved and cleaned, and the H-shaped steel (1) and the steel cage (2) are hoisted and placed to complete the preparatory work before pouring; S3. The vibrator (3) is lowered to the bottom of the foundation pit vertically placed near the H-beam (1) and the distance between the vibrator (3) and the H-beam (1) is maintained at h = 10-15cm; S4. Start pouring concrete. When the concrete liquid level exceeds the top of the vibrator (3), start the concrete vibrator (3), and lift the vibrator (3) and the concrete pouring conduit (4) until the concrete is poured to the top of the continuous wall.

2. A method for improving the quality of H-shaped steel joint concrete in underground continuous wall according to claim 1, characterized in that: In step S1, the custom-made vibrator (3) is provided with an anti-floating weight, the weight of which is G=ρ 液 V 排 ρ 液 is the density of concrete, V 排 It is the volume of vibrator (3) + anti-floating weight.

3. A method for improving the quality of H-shaped steel joint concrete in underground continuous wall according to claim 1, characterized in that: In step S2, a steel cage (2) is suspended between two adjacent H-shaped steels (1) to form a construction section.

4. A method for improving the quality of H-shaped steel joint concrete in underground continuous wall according to claim 1, characterized in that: In step S4, when the mouth of the concrete pouring conduit (4) is 6 m higher than the end of the vibrator (3), the vibrator (3) is lifted to perform layered vibration until the concrete is poured to the top of the continuous wall.

5. A method for improving the quality of H-shaped steel joint concrete in underground continuous wall according to claim 4, characterized in that: The thickness of each layer of layered vibration is ≤ 1.25 times the effective length of the vibrator, and the bottom end of the vibrator (3) is inserted into the lower layer of concrete by 5-10 cm.

6. A method for improving the quality of H-shaped steel joint concrete in underground continuous wall according to claim 4, characterized in that: The vibration time of each layer is controlled within 20-30 seconds.

7. A method for improving the quality of H-shaped steel joint concrete in underground continuous wall according to claim 1, characterized in that: In step S4, during the grouting and lifting process of the concrete pouring conduit (4), the distance between the top end of the vibrator (3) and the opening of the concrete pouring conduit (4) is not less than 2 m and not more than 6 m.

8. The method for improving the quality of H-shaped steel joint concrete in underground continuous wall according to claim 1, characterized in that: Repeat steps S2-S4 to carry out the construction of the next construction section.

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