Construction method of latticed underground diaphragm wall adopting square pile type nodes

Abstract

The invention discloses a latticed underground diaphragm wall construction method adopting square pile type nodes. The latticed underground diaphragm wall construction method comprises the steps that the positions of all nodes of an underground diaphragm wall are divided in an underground diaphragm wall construction area; a cross-shaped square pile node type cast-in-place pile hole is constructed in each design node position to serve as an underground diaphragm wall node groove hole; an underground diaphragm wall reinforcement cage and a notch pre-embedded structural steel part are lowered, concrete is poured, and a cross-shaped pile wall with a notch is formed; an underground continuous wall groove section is constructed between every two cross-shaped pile walls; an underground diaphragm wall reinforcement cage is lowered, concrete is poured, and a latticed underground diaphragm wall structure is formed; according to the latticed underground diaphragm wall construction method adopting the square pile type nodes, the construction process of the underground diaphragm wall is simplified, and the construction efficiency is remarkably improved; the problems of insufficient rigidity, low efficiency, complex working procedures, large perpendicularity deviation of node piles and the like in traditional underground diaphragm wall construction with circular cast-in-place piles as nodes are solved, and remarkable technical advancement and engineering popularization value are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and more specifically to a construction method for a grid-shaped diaphragm wall using square pile-type joints. Background Art

[0002] The grid pile diaphragm wall has strong integrity, high stiffness, high strength, and good water-proof performance. It is not only widely used in underground retaining structures, but also commonly used as the underground foundation of large civil engineering projects, suspension bridge anchorages and other structures to bear the load-bearing function. In large hydropower projects, the grid-shaped diaphragm wall structure is also used to bear the overall anti-impact function.

[0003] In the construction of traditional grid pile diaphragm walls, circular bored cast-in-place piles are mostly used as the joints of the grid pile diaphragm walls, and the grooving machine is used to form the groove segments and joints. However, for the circular cast-in-place piles used as joints, it is difficult to ensure the verticality of the pile body, the horizontal stiffness of the pile body is not high, and the verticality of the milling groove on the circular joint cannot be guaranteed. The joint structure of nodes with more than two connecting grooves is loosely connected and the integrity is not strong. The construction process is complex and the construction efficiency is low. Summary of the Invention

[0004] In view of this, the present invention provides a construction method for a grid-shaped diaphragm wall using square pile-type joints, aiming to solve the above technical problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A construction method for a grid-shaped diaphragm wall using square pile-type joints, comprising the following steps: S1. According to the grid structure of the diaphragm wall, the positions of each joint of the diaphragm wall are demarcated on the ground in the construction area of the diaphragm wall; S2. At each designed joint position, construct a cross-shaped square pile joint cast-in-place pile hole as the joint slot hole of the diaphragm wall; S3. Lower the steel cage of the diaphragm wall and the structural steel parts embedded at the slot opening, and pour concrete to form a cross-shaped pile wall with a slot opening; S4. Construct the diaphragm wall slot segment between every two cross-shaped pile walls; lower the steel cage of the diaphragm wall and pour concrete to form a grid-shaped diaphragm wall structure.

[0006] Preferably, in step S2, a hydraulic grab or a milling machine is used to dig out the cross-shaped square pile joint cast-in-place pile hole.

[0007] Preferably, in step S3, the corresponding steel cage is processed according to the cross-shaped square pile joint cast-in-place pile hole, and the number of structural steel parts embedded at the slot opening in each cross-shaped pile wall is two, and the two slot opening embedded structural steel parts are installed oppositely on the vertical sides of the steel cage.

[0008] Preferably, the cross-section of the slot embedded structural steel part is U-shaped, the width of the slot embedded structural steel part is greater than the thickness of the underground continuous wall, the U-shaped mouth of the slot embedded structural steel part faces the side wall of the cross-shaped cast-in-place pile hole, and the distance between each outer side wall of the slot embedded structural steel part and the steel cage is equal.

[0009] Preferably, in step S4, an underground continuous wall groove section is constructed between every two cross-shaped pile walls, and at least one underground continuous wall unit is constructed in sequence in the direction corresponding to the vertical groove of the cross-shaped pile wall to construct the longitudinal wall of the grid wall; at least one underground continuous wall unit is constructed in sequence in the transverse direction of the cross-shaped pile wall to construct the transverse wall of the grid wall.

[0010] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a grid-shaped underground continuous wall construction method using square pile nodes, which has the following beneficial effects: The present invention adopts a grid-shaped underground continuous wall construction method with square pile nodes, replaces traditional circular nodes with cross pile node reinforcement, and realizes the simplification of the process and significant improvement of construction efficiency of underground continuous wall construction through structural innovation and process optimization; it solves the problems of insufficient rigidity, low efficiency, complex process, large vertical deviation of node piles, etc. existing in the construction of traditional underground continuous walls with circular cast-in-place piles as nodes, and has significant technological advancement and engineering promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] 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.

[0012] Figure 1 The accompanying drawing is a schematic diagram of the overall structure provided by the present invention; Figure 2 The accompanying drawing is a schematic diagram of the steel cage structure provided by the present invention; Figure 3 The accompanying drawing is a schematic diagram of a cross-shaped pile wall structure provided by the present invention; Figure 4 The accompanying drawing is a schematic diagram of the longitudinal wall structure of the grid wall provided by the present invention; Figure 5 The accompanying drawing is a schematic diagram of the transverse wall structure of the grid wall provided by the present invention; Figure 6 The accompanying drawing is a schematic diagram of a grid-shaped underground continuous wall unit structure provided by the present invention; 1. Cross-shaped pile wall; 2. Steel reinforcement cage; 3. Embedded structural steel parts at the slot opening; 4. Diaphragm wall slot section; 5. Vertical slot opening; 6. Horizontal wall. Specific implementation manner

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0014] See Figure 1-6 , the embodiments of the present invention disclose a construction method for a grid-shaped diaphragm wall using a square pile type joint, including the following steps: According to the grid structure of the diaphragm wall, mark the positions of each joint of the diaphragm wall on the ground in the diaphragm wall construction area; Construct a cross-shaped square pile joint cast-in-place pile hole at each designed joint position as the diaphragm wall joint slot hole; The construction method of the cross-shaped cast-in-place pile is as follows: Use a general hydraulic grab or milling machine to dig out a linear diaphragm wall slot hole, and then use the square bucket body of the modified hydraulic grooving machine to dig out the joint square pile hole at the center of the joint to form a cross-shaped square pile type joint slot hole: the width of the vertical slot hole of the cross-shaped square pile type joint slot hole is greater than the width of the horizontal slot hole; the modified hydraulic grooving machine is to widen the bucket body without making other changes and apply the conventional structure, which will not be elaborated here.

[0015] Lower the steel reinforcement cage 2 of the diaphragm wall and the embedded structural steel parts 3 at the slot opening, and pour concrete to form a cross-shaped pile wall 1 with a slot opening. In special cases, such as when the anti-pile joint is on the side, only the inner embedded slot opening is set.

[0016] Among them, a corresponding steel reinforcement cage 2 is processed for each cross-shaped cast-in-place pile hole. The cross-section of the steel reinforcement cage 2 is cross-shaped. The steel reinforcement cage 2 includes multiple main reinforcements. The multiple main reinforcements, multiple layers of circumferential stirrups and multiple stiffeners are welded and connected to form a cage-like structure; the number of embedded structural steel parts 3 at the slot opening in each cross-shaped pile wall 1 is two, and the two embedded structural steel parts 3 at the slot opening are installed oppositely on the vertical sides of the steel reinforcement cage 2.

[0017] The cross section of the slotted pre-embedded structural steel member 3 is U-shaped, the width of the slotted pre-embedded structural steel member 3 is about 3 cm greater than the thickness of the underground continuous wall, the U-shaped mouth of the slotted pre-embedded structural steel member 3 faces the side wall of the cross-shaped cast-in-place pile hole, and the outer side walls of the slotted pre-embedded structural steel member 3 are at equal distances from the steel cage 2; concrete is poured, and the slotted pre-embedded structural steel member 3 is pulled out after the concrete is initially set; the pre-embedded structural steel member 3 is pulled out or not as needed, and the gap formed by it is convenient for the cross-shaped pile wall 1 and the second-phase underground continuous wall section to be embedded and connected during the later construction of the second-phase wall.

[0018] See also Figure 4-Figure 6 An underground continuous wall groove section 4 is constructed between every two cross-shaped pile walls; when constructing the underground continuous wall groove section 4, a groove milling machine is used to mill out the groove holes, the underground continuous wall steel cage is lowered, and concrete is poured to form a grid-like underground continuous wall structure.

[0019] During the specific construction, an underground continuous wall groove section 4 is constructed between every two cross-shaped pile walls 1 in the longitudinal direction, and at least one underground continuous wall unit is constructed in sequence in the corresponding direction of the vertical notch 5 of the cross-shaped pile wall 1 to construct the longitudinal wall body of the grid wall; the two underground continuous wall units are connected by the conventional pipe pulling method or joint plate method, which is an existing common technology and will not be repeated here; the underground continuous wall unit connected to the vertical notch 5 is embedded in the slot hole of the cross pile wall; at least one underground continuous wall unit is constructed in sequence in the transverse direction of the cross-shaped pile wall 1 to construct the transverse wall body 6 of the grid wall; the cross-shaped pile wall 1 is connected to the underground continuous wall unit in the transverse direction by the conventional pipe pulling method or joint plate method, which will not be repeated here; the cross-shaped square pile node pile wall, as well as the longitudinal and horizontal underground continuous wall bodies are constructed in sequence to form a grid-shaped underground continuous wall.

[0020] The present invention adopts a grid-shaped underground continuous wall construction method with square pile nodes, replaces traditional circular nodes with cross pile node reinforcement, and realizes significant improvement in construction efficiency in underground continuous wall construction by simplifying the process; it solves the problems of insufficient rigidity, low efficiency, complex procedures, and large vertical deviation of node piles in the traditional construction of underground continuous walls with circular cast-in-place piles as nodes. It has significant technological advancement and engineering promotion value. In specific applications, the node density can be set according to actual needs to realize the construction of grid-shaped underground continuous walls of different lengths and widths.

[0021] 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.

[0022] 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 grid-shaped underground continuous wall construction method using square pile nodes, characterized in that: The following steps are involved: S1. According to the grid structure of the underground continuous wall, the positions of the nodes of the underground continuous wall are divided on the ground of the underground continuous wall construction area; S2. Construct a cross-shaped square pile node-type cast-in-place pile hole at each designed node position as the underground continuous wall node slot hole; S3, lowering the underground continuous wall reinforcement cage and the pre-buried structural steel parts in the notch, pouring concrete, and forming a cross-shaped pile wall with notches; S4. Construct an underground continuous wall trench section between every two cross-shaped pile walls; lower the underground continuous wall reinforcement cage and pour concrete to form a grid-like underground continuous wall structure.

2. A grid-shaped underground continuous wall construction method using square pile nodes according to claim 1, characterized in that: In the step S2, a hydraulic grab or a slot milling machine is used to dig out a cross-shaped square pile node-type cast-in-place pile hole.

3. A grid-shaped underground continuous wall construction method using square pile nodes according to claim 1, characterized in that: In the step S3, a corresponding steel cage is processed corresponding to the cross-shaped square pile node type cast-in-place pile hole, and the number of pre-embedded structural steel parts in the notch of each cross-shaped pile wall is two, and the two pre-embedded structural steel parts in the notch are relatively installed on the vertical sides of the steel cage.

4. A grid-shaped underground continuous wall construction method using square pile nodes according to claim 1, characterized in that: The cross-section of the slot embedded structural steel part is U-shaped, the width of the slot embedded structural steel part is greater than the thickness of the underground continuous wall, the U-shaped mouth of the slot embedded structural steel part faces the side wall of the cross-shaped cast-in-place pile hole, and the outer side walls of the slot embedded structural steel part are equidistant from the steel cage.

5. The method for constructing a grid-shaped underground continuous wall using square pile nodes according to claim 1, characterized in that: In the step S4, an underground continuous wall groove section is constructed between every two cross-shaped pile walls, and at least one underground continuous wall unit is constructed in sequence in the direction corresponding to the vertical groove of the cross-shaped pile wall to construct the longitudinal wall of the grid wall; at least one underground continuous wall unit is constructed in sequence in the transverse direction of the cross-shaped pile wall to construct the transverse wall of the grid wall.

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