Construction method of construction passageway in limited space under bridge

Abstract

This invention provides a construction method for a construction gate in a confined space under a bridge, comprising the following steps: S1, setting a suitable construction location; S2, marking the route, starting point, and ending point of the gate; S3, constructing the first cast-in-place piles; S4, connecting and fixing the first cast-in-place piles on both sides using positioning frames; S5, excavating the first and second excavation pits, and simultaneously setting up second excavation pits on both sides along the direction of the gate; S6, simultaneously constructing the third excavation pit, with the first, second, and third excavation pits arranged in a stepped manner; S7, continuing excavation; S8, repeating S3~S6 until the second foundation pit is formed; S9, completing the construction of the third cast-in-place piles; S10, forming the first connecting foundation pit; S11, repeating S3~S10 until the second connecting foundation pit and the continuous row of cast-in-place piles are completed; S12, erecting formwork and pouring filling to form the designed target pit. This invention is highly efficient, significantly improving overall construction efficiency and ensuring operational safety.

Description

Technical Field

[0001] This invention relates to the field of civil engineering construction technology, and in particular to a construction method and device for a construction gate in a confined space under a bridge. Background Technology

[0002] With the vigorous advancement of infrastructure development in my country, the water transport industry has experienced rapid growth, and lock construction technology has become increasingly mature. However, current lock construction in my country mostly employs the method of large-scale excavation followed by cast-in-place construction, resulting in large volumes of earthwork excavation, significant traffic disruptions when crossing existing bridges and roads, complex formwork structures, and cumbersome construction operations. Chinese patent document CN214993753 U describes a grid-type diaphragm wall structure for lock chambers suitable for cohesive soil foundations; however, this structure requires the completion of all diaphragm wall construction before excavation can begin, limiting overall construction efficiency. Chinese patent document CN217203965 U describes an integral lock chamber structure based on longitudinal and transverse tie rods and bottom supports, which also suffers from the aforementioned problems, exhibiting deficiencies in overall construction and requiring improvement. Summary of the Invention

[0003] This invention provides a construction method and device for a construction gate in a confined space under a bridge, which solves the problems of cumbersome construction, low construction efficiency, and significant safety hazards of traditional cast-in-place ship lock chambers, as well as the significant impact on traffic.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a construction method for a construction gate in a confined space under a bridge, comprising the following steps: S1. Conduct surveying and setting out based on the terrain to determine suitable construction locations; S2. Mark the cable path, construction start point and end point of the gate; S3. Construction of the first cast-in-place piles on both sides; S4. The first cast-in-place piles on both sides are connected and fixed by a positioning frame; S5. After the first cast-in-place pile is stabilized, the first excavation pit and the second excavation pit are excavated in sequence, and the second excavation pit is set on both sides along the direction of the gate. S6. Observe the surrounding soil condition and simultaneously carry out the construction of the third excavation pit. The first, second and third excavation pits are set up in a stepped manner. S7. Continue excavation until the first foundation pit is formed; S8. Construct the second cast-in-place pile at a distance from the first cast-in-place pile, and repeat S3~S6 until the second foundation pit is formed; S9. Complete the construction of the third cast-in-place pile between the first and second cast-in-place piles; S10. Connect the first foundation pit and the second foundation pit during construction to form the first connected foundation pit; S11. Repeat S3~S10 until the second connecting foundation pit and the row of cast-in-place piles are completed. S12. Remove the soil attached to the side wall of the continuous cast-in-place piles in the second connecting foundation pit, erect formwork and pour filling to form the design target pit.

[0005] In the preferred embodiment, during the construction of the first, second, and third cast-in-place piles, it is necessary to maintain the verticality of the borehole, clean the borehole and replace the grout, remove the soil and debris, and then install the reinforcing cage.

[0006] In the preferred embodiment, in S4, the positioning frame is installed after the first cast-in-place pile has initially set, and the positioning frames on different first cast-in-place piles are adjusted to connect and fix adjacent positioning frames.

[0007] In the preferred scheme, S5 employs a combination of manual and mechanical excavation methods to ensure excavation efficiency.

[0008] In the preferred embodiment, in S6, the construction is carried out by excavation in stages. The depth of the first excavation pit is greater than the depth of the second excavation pit, the depth of the second excavation pit is greater than the depth of the third excavation pit, and an inclined retaining wall is set on the side of the first excavation pit away from the third excavation pit.

[0009] In the preferred embodiment, during the construction of the first excavation pit, the second excavation pit, and the third excavation pit, the positioning frames at the corresponding positions need to be dismantled sequentially.

[0010] In the preferred scheme, during construction, it is necessary to observe the soil condition on both sides and pay attention to the safety of excavation.

[0011] In the preferred embodiment, when constructing the second cast-in-place pile on the construction site under the already erected bridge, the transmission of vibration during construction should be minimized as much as possible. At the same time, the second cast-in-place pile should use fast-setting concrete, and protection should be provided at the support legs under the already erected bridge.

[0012] In a preferred embodiment, a construction device for a construction gate includes multiple rows of positioning frames arranged along the direction of the gate. Each positioning frame includes two oppositely arranged insert plates, which are inserted into a first, second, and third cast-in-place pile. The upper part of each insert plate is connected to a vertical plate by bolts and nuts, and the two opposite vertical plates are connected by a horizontal plate.

[0013] In the preferred embodiment, straight extension plates are symmetrically arranged on both sides of the insert plate. A screw is threadedly connected to the straight extension plate, and a support leg pad is hinged to the bottom of the screw. The support leg pad is attached to the upper side of the construction site. Two adjacent vertical plates are connected by bolts, and a sleeve is inserted through the bolt. The length of the sleeve is equal to the distance between the two vertical plates.

[0014] The beneficial effects of this invention are as follows: This solution has good overall economic efficiency. While using cast-in-place piles as the side walls of the lock chamber, it also serves as the support structure for the excavation of the lock chamber. There is no need for slope protection, which greatly reduces the amount of excavation. The side walls of the lock chamber are constructed using cast-in-place piles, which eliminates the need for cast-in-place formwork, making construction convenient. It is suitable for lock engineering construction in environments such as crossing existing bridges and highways where the excavation range is limited. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the construction site for this invention; Figure 2 This is the traditional construction schematic diagram, state one; Figure 3 This is the traditional construction schematic diagram, state two; Figure 4 This is the first construction state of the present invention; Figure 5 This is the second construction state of the present invention; Figure 6 This is the third construction state of the present invention; Figure 7 This is the fourth construction state of the present invention; Figure 8 This is the fifth construction state of the present invention; Figure 9 This is the sixth construction state of the present invention; Figure 10 This is the seventh construction state of the present invention; Figure 11 This is the eighth construction state of the present invention; Figure 12 This is the ninth construction state of the present invention; Figure 13 This is the tenth construction state of the present invention; Figure 14 This is the eleventh construction state of the present invention; Figure 15 This is the twelfth construction state of the present invention; Figure 16 This is the thirteenth construction state of the present invention; Figure 17 This is a schematic diagram of the overall positioning frame of the present invention; Figure 18 yes Figure 17 Schematic diagram of the exploded structure, state one; Figure 19 yes Figure 17 The schematic diagram of the explosion structure, state two.

[0016] In the diagram: 1. Bridge already erected; 2. Gate; 3. Construction site; 4. Sloping pit; 5. First cast-in-place pile; 6. Positioning frame; 601. Insert plate; 602. Vertical plate; 603. Horizontal plate; 604. Straight extension plate; 605. Screw; 606. Support leg pad; 607. Sleeve; 608. Bolt; 609. First excavation pit; 7. Inclined retaining wall; 8. Second excavation pit; 9. Third excavation pit; 10. Second cast-in-place pile; 11. First foundation pit body; 12. Second foundation pit body; 13. Third cast-in-place pile; 14. First connecting foundation pit; 15. Second connecting foundation pit; 16. Continuous cast-in-place piles; 17. Design target pit; 18. Detailed Implementation

[0017] like Figure 4-16 A construction method for a construction gate within a confined space under a bridge includes the following steps: S1. Conduct surveying and setting out based on the terrain to determine suitable construction locations; S2. Mark the routing path, construction start point, and end point of gate 2; S3. Construction of the first cast-in-place pile 5 on both sides; S4. The first cast-in-place piles 5 on both sides are connected and fixed by positioning frames 6; S5. After the first cast-in-place pile 5 is stabilized, the first excavation pit 7 and the second excavation pit 9 are excavated in sequence, and the second excavation pit 9 is set on both sides along the direction of the gate 2. S6. Observe the surrounding soil condition and simultaneously carry out the construction of the third excavation pit 10. The first excavation pit 7, the second excavation pit 9 and the third excavation pit 10 are set up in a stepped manner. S7. Continue excavation until the first foundation pit 12 is formed; S8. Construct the second pile 11 at a distance from the first pile 5, and repeat S3~S6 until the second foundation pit 13 is formed. S9. Complete the construction of the third cast-in-place pile 14 between the first cast-in-place pile 5 and the second cast-in-place pile 11; S10. Connect the first foundation pit body 12 and the second foundation pit body 13 by construction to form the first connected foundation pit 15; S11. Repeat S3~S10 until the second connecting foundation pit 16 and the row of cast-in-place piles 17 are completed. S12. Remove the soil attached to the side wall of the continuous cast-in-place piles 17 in the second connecting foundation pit 16, erect formwork and pour filling to form the designed target pit 18.

[0018] Due to site constraints, the lock needs to pass under an existing bridge, and is limited by the span between the bridge piers. Therefore, construction must avoid impacting safe passage on the bridge. Figure 1-3Traditional methods of excavating foundation pits require slope protection on both sides, involve large-scale excavation, and severely encroach on the safety space of the piers. Furthermore, the gate can only be constructed after the entire foundation pit is completed. This method demands high site quality and has a long construction period. In contrast, this scheme uses cast-in-place piles, allowing for segmented and zoned construction. It also ensures that trenches are excavated in stages after the piles are laid, and then the piles are connected after the trenches at different locations are completed. Obstructing soil between the trenches is removed, ensuring both construction safety and efficiency.

[0019] In the preferred embodiment, during the construction of the first cast-in-place pile 5, the second cast-in-place pile 11, and the third cast-in-place pile 14, it is necessary to maintain the verticality of the borehole, clean the borehole and replace the grout, remove soil debris, and then install the reinforcing cage. This structure ensures better construction quality, and the overall consistency of the sidewall formed by the first cast-in-place pile 5, the second cast-in-place pile 11, and the third cast-in-place pile 14 at different locations after connection is improved.

[0020] In the preferred embodiment, in step S4, after the first cast-in-place pile 5 has initially set, the positioning frame 6 is installed. The positioning frames 6 on different first cast-in-place piles 5 are adjusted, and adjacent positioning frames 6 are connected and fixed. This structure allows a stable connection foundation to be formed between the cast-in-place piles on both sides, ensuring good pouring effect. At the same time, the positioning frame 6 is removed in stages according to the needs of subsequent trenching, and the part that has been poured into the cast-in-place pile is cut.

[0021] In the preferred embodiment, excavation in S5 employs a combination of manual and mechanical methods to ensure excavation efficiency. This structure allows for efficient operation based on the specific on-site construction conditions.

[0022] In the preferred embodiment, in step S6, construction is carried out using a step-by-step excavation method. The depth of the first excavation pit 7 is greater than the depth of the second excavation pit 9, and the depth of the second excavation pit 9 is greater than the depth of the third excavation pit 10. Simultaneously, an inclined retaining wall 8 is installed on the side of the first excavation pit 7 furthest from the third excavation pit 10. This structure provides stable support and restraint, preventing overall tilting and collapse due to uneven force on one side.

[0023] In the preferred embodiment, during the construction of the first excavation pit 7, the second excavation pit 9, and the third excavation pit 10, the positioning frames 6 at the corresponding positions need to be removed sequentially. This structure ensures construction safety and quality while allowing for the removal of the positioning frames 6 as needed, ensuring sufficient construction space. Simultaneously, the positioning frames 6 serve as temporary crossbeams, with the crossbeams acting as supporting foundations and electric hoists installed as lifting tools. Due to space limitations at the construction site, large equipment lacks sufficient range of motion. Furthermore, the foundation is adjacent to the piers of an existing bridge, so it is necessary to minimize the impact of construction vibrations on the piers to avoid significant changes in the pier's structure and stress, which could lead to danger. Correspondingly, a combination of manual and mechanical methods is required. To ensure the cleanliness and efficiency of soil removal within the pits, electric hoists are used with hooks and ropes, with a lifting bucket loaded with soil placed below the rope. This coordinated approach ensures the overall safety and thoroughness of the construction.

[0024] In the preferred scheme, during construction, it is necessary to observe the soil condition on both sides and pay attention to the safety of excavation.

[0025] In the preferred embodiment, when constructing the second cast-in-place pile 11 on the construction site 3 below the already erected bridge 1, vibration transmission during construction is minimized. Furthermore, the second cast-in-place pile 11 uses fast-setting concrete, and protective measures are installed at the support legs under the already erected bridge 1. This structure ensures better construction results, controllable construction time, and greater overall safety during construction. It also provides better overall stability when exposed to rainwater erosion.

[0026] like Figure 17-19 In a preferred embodiment, a construction device for a construction gate includes multiple rows of positioning frames 6 arranged along the direction of the gate 2. Each positioning frame 6 includes two opposing insert plates 601, which are inserted into the first cast-in-place pile 5, the second cast-in-place pile 11, and the third cast-in-place pile 14. A vertical plate 602 is connected to the upper part of each insert plate 601 via bolts 608 and nuts 609. The two opposing vertical plates 602 are connected by a horizontal plate 603. This structure provides a fixed foundation for the insert plate 601, ensuring the parallelism of the top horizontal plate 603, thus serving as a reference foundation for construction. The cast-in-place piles on both sides exhibit good consistency in grouting and are at the same height.

[0027] In the preferred embodiment, straight extension plates 604 are symmetrically arranged on both sides of the insert plate 601. A screw rod 605 is threaded onto the straight extension plate 604, and a support leg pad 606 is hinged to the bottom of the screw rod 605. The support leg pad 606 is attached to the upper side of the construction site 3. Two adjacent vertical plates 602 are connected by bolts 608, with a sleeve 607 passing through the bolt 608. The length of the sleeve 607 is equal to the distance between the two vertical plates 602. This structure allows the support leg pad 606 to be adjusted, ensuring the accurate positioning of the insert plate 601, allowing it to be vertically inserted into the cast-in-place pile. It is easy to assemble and disassemble, facilitating subsequent reuse.

[0028] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A construction method for a construction gate within a confined space under a bridge, characterized by: Includes the following steps: S1. Conduct surveying and setting out based on the terrain to determine suitable construction locations; S2, mark the routing path, construction start point and end point of the gate (2); S3. Construction of the first cast-in-place piles (5) on both sides; S4, the first cast-in-place piles (5) on both sides are connected and fixed by positioning frames (6); S5. After the first cast-in-place pile (5) is stabilized, the first excavation pit (7) and the second excavation pit (9) are excavated in sequence, and the second excavation pit (9) is set on both sides along the direction of the gate (2). S6. Observe the surrounding soil condition and carry out the construction of the third excavation pit (10) at the same time. The first excavation pit (7), the second excavation pit (9) and the third excavation pit (10) are set in a stepped manner. S7. Continue excavation until the first foundation pit (12) is formed. S8. The second pile (11) is constructed at a distance from the first pile (5), and S3~S6 are repeated until the second foundation pit (13) is formed. S9. Complete the construction of the third cast-in-place pile (14) between the first cast-in-place pile (5) and the second cast-in-place pile (11); S10. Connect the first foundation pit body (12) and the second foundation pit body (13) through construction to form the first connected foundation pit (15). S11. Repeat S3~S10 until the second connecting foundation pit (16) and the continuous row of cast-in-place piles (17) are completed. S12. Remove the soil attached to the side wall of the continuous cast-in-place piles (17) in the second connecting foundation pit (16), and fill it with formwork to form the design target pit (18).

2. The construction method for a construction gate in a confined space underpass bridge according to claim 1, characterized in that: in During the construction of the first cast-in-place pile (5), the second cast-in-place pile (11) and the third cast-in-place pile (14), it is necessary to maintain the verticality of the hole position, clean the hole and replace the grout, remove the soil and debris, and then set up the steel cage.

3. The construction method of a construction gate in a confined space underpass bridge according to claim 1, characterized in that: in S4, after the first cast-in-place pile (5) has initially set, the positioning frame (6) is installed, the positioning frames (6) on different first cast-in-place piles (5) are adjusted, and two adjacent positioning frames (6) are connected and fixed.

4. The construction method for a construction gate in a confined space underpass bridge according to claim 1, characterized in that: In S5, both manual and mechanical operations are used in combination for excavation to ensure excavation efficiency.

5. The construction method of a construction gate in a confined space under a bridge according to claim 1, characterized in that: in S6, the construction is carried out by step-by-step excavation, the depth of the first excavation pit (7) is greater than the depth of the second excavation pit (9), the depth of the second excavation pit (9) is greater than the depth of the third excavation pit (10), and at the same time, an inclined retaining wall (8) is set on the side of the first excavation pit (7) away from the third excavation pit (10).

6. The construction method of a construction gate in a confined space underpass bridge according to claim 5, characterized in that: in During the construction of the first excavation pit (7), the second excavation pit (9) and the third excavation pit (10), the positioning frames (6) at the corresponding positions need to be dismantled in sequence.

7. The construction method for a construction gate in a confined space under a bridge according to claim 1, characterized in that: During construction, it is necessary to observe the soil condition on both sides and pay attention to the safety of excavation.

8. The construction method for a construction gate in a confined space underpass bridge according to claim 1, characterized in that: When constructing the second cast-in-place pile (11) on the construction site (3) under the erected bridge (1), the vibration transmission during construction should be minimized as much as possible. At the same time, the second cast-in-place pile (11) uses fast-setting concrete and protection is provided at the support legs under the erected bridge (1).

9. The construction apparatus for the construction method of a construction gate in a confined space underpass bridge according to claim 1, characterized in that: The system includes multiple rows of positioning frames (6) arranged along the direction of the gate (2). Each positioning frame (6) includes two oppositely arranged insert plates (601). The insert plates (601) are inserted into the first cast-in-place pile (5), the second cast-in-place pile (11), and the third cast-in-place pile (14). The upper part of the insert plate (601) is connected to a vertical plate (602) by bolts (608) and nuts (609). The two opposite vertical plates (602) are connected by a horizontal plate (603).

10. The construction device according to claim 9, characterized in that: The insert plate (601) is symmetrically provided with straight extension plates (604) on both sides. A screw rod (605) is threaded onto the straight extension plate (604). A support leg pad (606) is hinged to the bottom of the screw rod (605). The support leg pad (606) is attached to the upper side of the construction site (3). Two adjacent vertical plates (602) are connected by bolts (608). A sleeve (607) is provided on the bolt (608). The length of the sleeve (607) is equal to the distance between the two vertical plates (602).

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