CN-115559324-B - Construction method of underground diaphragm wall and TRD (concrete form wall) joint water-stopping system

Abstract

The invention relates to a construction method of an underground continuous wall and TRD joint water stop system, which comprises the following specific steps of 1) performing high-pressure jet grouting pile construction, performing drilling machine grouting construction after a high-pressure jet grouting drill is in place, performing grouting and grouting by adopting a movable support quick recharging structure, thus completing construction of one high-pressure jet grouting pile, then shifting the high-pressure jet grouting drill to a lower pile construction, 2) performing underground continuous wall construction, namely excavating an underground continuous wall foundation trench, then hoisting a steel reinforcement cage into the underground continuous wall foundation trench, and pouring concrete to complete the underground continuous wall construction, 3) performing joint section water stop construction, namely arranging a closed-loop steel sheet pile outside the high-pressure jet grouting pile for water stop, 4) performing joint construction, namely welding special-shaped steel and the steel reinforcement cage, then synchronously lowering the special-shaped steel and the steel reinforcement cage into the underground continuous wall foundation trench, and pouring concrete at the joint to complete joint construction. The invention has the characteristics of high foundation pit excavation safety, good pile forming quality of the high-pressure jet grouting pile, simple operation and the like, and has better comprehensive benefit.

Inventors

• LIU WEI
• SUN JUNHAO
• LIU LUGANG
• XIN GUOQIANG
• WANG ZHEN
• GAO SHUITANG
• HU CHAO
• HUANG BAI
• Wei chunxing
• Ni Yangkai

Assignees

• 浙江交工地下工程有限公司
• 浙江交工集团股份有限公司

Dates

Publication Date

20260512

Application Date

20221115

Claims (3)

1. 1. The construction method of the underground diaphragm wall and TRD joint water stopping system is characterized by comprising the following specific steps: The construction of the high-pressure jet grouting pile (19) comprises the steps of performing site leveling and construction measurement, positioning a high-pressure jet grouting drill, performing drilling machine grouting construction after positioning the high-pressure jet grouting drill, performing grouting and grouting by adopting a process of grouting firstly and then rotating and lifting, performing grouting and grouting by adopting a mobile bracket rapid recharging structure, thereby completing construction of one high-pressure jet grouting pile, then shifting the high-pressure jet grouting drill to a lower pile for construction, repeating the cycle until the construction of all high-pressure jet grouting piles (19) is completed, wherein the mobile bracket rapid recharging structure comprises a frame body (11), a mobile body (9) is arranged on the frame body (11), a winch (13) is arranged on the frame body (11), one end of a cable (12) is connected with the winch (13), the other end of the cable is connected with a recharging body (18), the recharging body (18) is in a box structure, the upper end of the recharging body (18) is provided with a grouting hole (10), the inside of the recharging body (18) is provided with a cavity, the bottom of the recharging body (18) is provided with a grouting outlet (20), the recharging body (18) is provided with a tab (17) and the other side of the recharging body (17) is welded with the recharging body (17) by the other side of the high-speed steel plate (17), the recharging body (17) is provided with the recharging body (17) and the other side of the recharging body (17) through the flexible plate (17), the concrete method comprises the steps of moving a frame body (11) to the upper part of a high-pressure jet grouting pile (19) subjected to just grouting construction, adjusting the height of a return tank body (18) through a winch (13), enabling the lower end of the return tank body (18) to be closely attached to the upper end surface of the high-pressure jet grouting pile (19), locking a positioning rod (16) to enable the return tank body (18) to be fixed at the height position, grouting concrete slurry into the return tank body (18) through a grouting hole (10), enabling concrete slurry to flow out of a slurry outlet (20) at the lower end of the return tank body (18), grouting and grouting the high-pressure jet grouting pile (19), and transferring the frame body to the upper part of the next high-pressure jet grouting pile (19) through a moving body after grouting and grouting are completed, and grouting construction is performed on the next high-pressure jet grouting pile (19); Step 2) foundation trench construction of the ground continuous wall, namely excavating foundation trench of the ground continuous wall, arranging high-pressure jet grouting piles (19) on two sides of the foundation trench of the ground continuous wall, adopting an assembled internal supporting guide wall structure or a groove shaping profile steel supporting system to realize the stable supporting of the foundation trench after the foundation trench of the ground continuous wall is excavated, and then hoisting a reinforcement cage and pouring concrete into the foundation trench of the ground continuous wall to finish the foundation trench construction of the ground continuous wall; step 3) water stopping construction of the joint section, namely arranging a closed-loop steel sheet pile (35) at the outer side of the high-pressure jet grouting pile to stop water, arranging a grouting pipe (34) at the inner side of the closed-loop steel sheet pile (35), and grouting into soil through the grouting pipe if the water stopping effect is poor after the construction of the closed-loop steel sheet pile is completed; And 4) constructing a joint, namely welding the special-shaped steel (42) with the reinforcement cage (33), then synchronously lowering the special-shaped steel (42) and the reinforcement cage (33) into a foundation groove of a ground continuous wall, arranging the special-shaped steel (42) at the joint of the ground continuous wall and a TRD construction pile (43), pouring concrete at the joint, and finishing the construction of the joint, wherein the special-shaped steel (42) consists of an inclined steel plate (39), a vertical steel plate (40) and a transverse steel plate (41), and the two inclined steel plates (39) are welded at one end of the vertical steel plate (40) and form a Y-shaped structure, and the other end of the vertical steel plate (40) is welded with the transverse steel plate (41) vertically.
2. 2. The construction method of the underground diaphragm wall and TRD joint water stop system according to claim 1 is characterized in that in the step 2), the groove-shaped steel support system comprises a crossheading steel (1) and special-shaped steel plates (4), the crossheading steel (1) is arranged on the inner walls of two sides of a ground diaphragm wall base groove, the crossheading steel (1) is arranged along the length direction of the ground diaphragm wall base groove, a steel panel (5) is arranged on the upper end face of the crossheading steel (1), the steel panel (5) is paved on the ground on two sides of the upper end of the ground diaphragm wall base groove, the steel panel (5) is fixed with the ground through anchor nails (7), the special-shaped steel plates (4) are arranged on the inner walls of two sides of the ground diaphragm wall base groove, the side walls of the crossheading steel (1) are clung the special-shaped steel plates (4), the steel plates (4) are sequentially paved along the length direction of the ground diaphragm wall base groove, a steel plate connecting joint (3) is formed between two opposite special-shaped steel plates (4), an inner supporting steel (2) is arranged between the two special-shaped steel plates (4), and an inner supporting steel (6) is arranged above the steel plate connecting joint (3).
3. 3. The construction method of the underground diaphragm wall and TRD connection water stop system according to claim 1, wherein in the step 2), the assembled inner support guide wall structure comprises guide wall steel plates (27), cross bars (23) and steel bars (25), the guide wall steel plates (27) are arranged on guide walls on two sides of a ground diaphragm wall base groove, inclined lug plates (28) and lug plates (30) are arranged on the guide wall steel plates (27), the lug plates (30) are arranged below the inclined lug plates (28), one end of each cross bar (23) is connected with the corresponding lug plate (30) through bolts, angle steel (31) is welded at the other end of each cross bar (23), the inclined lug plates (28) are connected with the upper parts of the steel bars (25) through movable connectors (26), the bottoms of the steel bars (25) are tightly attached to the angle steel (31) and are connected with the angle steel bars (31), and the cross bars (24) are transversely supported between the steel bars (25) on two sides.

Description

Construction method of underground diaphragm wall and TRD (concrete form wall) joint water-stopping system Technical Field The invention relates to a construction method of an underground diaphragm wall and TRD (total internal reflection) joint water stop system, which is mainly suitable for the construction of the underground diaphragm wall and the TRD joint water stop system, and belongs to the technical field of civil engineering. Background In the foundation pit excavation construction process, a diaphragm wall enclosure structure, a TRD enclosure structure and the like are often adopted for enclosure, water blocking and support so as to ensure the safety of foundation pit engineering construction. In the engineering construction process, the underground diaphragm wall or the TRD support structure is reasonably selected according to the geological condition of the foundation pit, but due to the difference of structures of two support systems, a construction joint is inevitably formed between the two support structures, so that the condition of water leakage between the TRD support structure and the underground diaphragm wall support structure is caused, and the safety of foundation pit construction is endangered. In addition, during the construction process of the enclosure structure, the problems of collapse of the working groove, insertion deviation of H-shaped steel and the like are easy to occur. The construction method has the advantages that the construction problems of low construction efficiency of recharging and compacting of the traditional high-pressure jet grouting piles can be solved, poor pile forming quality of the high-pressure jet grouting piles can be caused due to untimely treatment, the traditional foundation trench support of the continuous wall guide wall is supported by a wood support system, the foundation trench collapse is easy to occur, the construction of the joint section under a rich water environment needs to adopt effective water stopping measures, accordingly the influence on the construction quality of the joint section is reduced, the traditional joint section is poor in water stopping effect, leakage diseases can occur, and the construction safety in the foundation pit excavation process is further affected. In view of the above, aiming at a series of problems occurring when underground continuous wall and TRD are connected and waterstop construction, the invention needs to provide a simple and effective construction method of an underground continuous wall and TRD connection waterstop system, so as to improve the safety of foundation pit excavation construction, and particularly has the advantages of remarkably saving construction cost, accelerating construction progress and improving construction safety performance for foundation pit excavation construction in water-rich and silt soft soil areas. Disclosure of Invention The invention aims to improve the safety of foundation pit excavation construction, and particularly has the advantages of remarkably saving construction cost, accelerating construction progress and improving construction safety performance for foundation pit excavation construction in a soft soil area rich in water and silt. In order to achieve the technical purpose, the invention adopts the following technical scheme: the invention relates to a construction method of a junction water-stop system of an underground diaphragm wall and TRD, which comprises the following specific steps: The construction method comprises the following steps of 1) constructing a high-pressure jet grouting pile, namely after the site leveling and construction measurement procedure is finished, positioning a high-pressure jet grouting drill, performing drilling rig guniting construction after the high-pressure jet grouting drill is positioned, completing guniting construction by adopting a flow of guniting firstly and then rotating and lifting, and performing guniting supplementing and grouting by adopting a movable support quick recharging structure so as to finish the construction of one high-pressure jet grouting pile; Step 2) construction of the underground diaphragm wall; after the foundation trench of the ground continuous wall is excavated, an assembled internal supporting guide wall structure or a groove shaping steel support system is adopted to realize the stable support of the foundation trench, and then a reinforcement cage is hoisted and concrete is poured into the foundation trench of the ground continuous wall to finish the construction of the ground continuous wall; Setting a closed-loop steel sheet pile outside the high-pressure jet grouting pile for water sealing, setting a grouting pipe inside the closed-loop steel sheet pile, and grouting into soil through the grouting pipe after the closed-loop steel sheet pile is constructed, wherein the water sealing effect is poor; and 4) constructing the joint, namely welding the special-shaped steel and the steel r