Water area slide way pile foundation and pile cap integrated construction method

Abstract

The invention relates to the technical field of water area engineering, and provides a water area slide way pile foundation and pile cap integrated construction method which comprises the following steps: constructing an island in a water area slide way area, and forming holes in a slide way pile foundation; chambering the upper pile foundation, and mounting a steel casing and a sealing bottom; a pile foundation reinforcement cage is installed after slurry in the reaming area is drained; a pile cap formwork is installed, and an openable and closable grout overflow opening is formed; pile cap steel bars are prefabricated and installed; the pile foundation and the pile cap concrete are integrally poured; and anchoring and connecting the reinforcement cage and the shear-resistant profile steel. The pile cap construction area is formed through reaming, integrated pouring is achieved through the steel casing and the customized formwork, traditional cofferdam construction and pile head breaking procedures are avoided, the construction efficiency and the structural integrity are improved, the construction period is shortened, and the cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of water area engineering, and particularly relates to an integrated construction method for pile foundations and pile caps of a water area slideway. Background Art

[0002] A slideway is a ramp in a ship repair yard and a shipbuilding yard that connects the shipbuilding berth and the water area for ships to get on and off the shipbuilding berth. Among them, the part extending underwater is the underwater slideway. In traditional water area slideway construction, the pile foundation and the pile cap need to be constructed step by step: after the pile foundation construction is completed, it is necessary to set up a cofferdam, break the pile head and re-excavate to pour the pile cap. This method has complex technology, long cycle, high cost, and the connection between the pile foundation and the pile cap is prone to structural weakening. There is a lack of an efficient, low-cost construction plan that can ensure the structural integrity in the prior art. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides an integrated construction method for pile foundations and pile caps of a water area slideway, which forms a construction space for the pile cap by reaming, and realizes the integrated pouring of the pile foundation and the pile cap by combining a steel casing and a customized formwork, improving the construction efficiency and structural strength.

[0004] To achieve the above object, the present invention provides the following technical solution: An integrated construction method for pile foundations and pile caps of a water area slideway, comprising the following steps:

[0005] Step 1: Build an island in the water area slideway area and form a hole for the slideway pile foundation;

[0006] Step 2: Ream the upper part of the pile foundation, install a steel casing and seal the bottom;

[0007] Step 3: Install the steel cage of the pile foundation;

[0008] Step 4: Install the formwork for the pile cap of the pile foundation and set an openable and closable slurry overflow port in the formwork area of the pile foundation;

[0009] Step 5: Install the steel bars of the pile cap, reserving the central area for concrete pouring and the anchoring of the pile cap connection structure;

[0010] Step 6: Pour the concrete of the pile foundation and the pile cap, and close the slurry overflow port after the slurry is discharged to realize the integrated forming of the pile foundation and the pile cap;

[0011] Step 7: Anchor the pile cap connection structure before the concrete begins to set, which is used to connect the later slideway cross beams.

[0012] Further, in the second step, the upper pile foundation reaming step includes: reaming the upper part of the pile foundation hole concentrically to 50 - 100 cm below the pile top elevation of the pile foundation to form a reamed area in the upper part of the pile foundation hole; the step of installing the steel casing and sealing the bottom includes: installing a steel casing for providing support in the reamed area, and closing the orifice of the pile foundation hole through an airbag device and then pouring underwater concrete to complete the bottom sealing of the reamed area.

[0013] Further, the airbag device includes a lower counterweight, an airbag body, and an upper suspension rope, which are connected in sequence from bottom to top; the lower counterweight is suspended in the pile foundation hole; the airbag body closes the hole opening by inflation.

[0014] Further, in the second step, after the bottom sealing of the reamed area is completed, the airbag device is lifted out by deflating the airbag body.

[0015] Further, in the third step, before installing the steel cage of the pile foundation, the steps include: using a mud pump to drain the mud in the reamed area and lowering the mud liquid level into the pile foundation hole.

[0016] Further, in the fourth step, the pile cap formwork of the pile foundation includes a plurality of formwork units, and the plurality of formwork units are sequentially assembled along the circumferential direction of the hole opening of the pile foundation hole in the reamed area.

[0017] Further, each formwork unit includes a pile cap side formwork, a pile cap bottom formwork, and a pile top side formwork; the pile cap bottom formwork is a fan-shaped structure configured with an outer arc edge and an inner arc edge, the pile cap side formwork abuts against the outer arc edge of the pile cap bottom formwork and extends upward to the pile cap elevation; the pile top side formwork abuts against the inner arc edge of the pile cap bottom formwork and extends downward to the hole opening.

[0018] Further, the pile top side formwork is provided with a slurry overflow port and a cover plate for closing or opening the slurry overflow port.

[0019] Further, the pile cap steel bars are prefabricated, and when the pile cap steel bars are prefabricated, a rebar-free area is reserved in the central area thereof; when pouring the concrete of the pile foundation and the pile cap, the pouring conduit is lowered into the central area of the pile cap steel bars.

[0020] Further, in the seventh step, the pile cap connection structure includes connecting the steel cage and the shear-resistant steel section; before the concrete of the pile foundation and the pile cap starts to set, the prefabricated connecting steel cage and the shear-resistant steel section are anchored into the concrete in the central area.

[0021] The beneficial effects of the present invention are as follows: An enlarged hole area is formed through the enlargement of the pile foundation, and a steel casing is used to support the enlarged hole area to form a construction area for the pile cap, avoiding the additional installation of cofferdams; An airbag device is used to seal the orifice of the pile foundation hole in the enlarged hole area, and underwater concrete is poured to achieve the bottom sealing of the enlarged hole area, ensuring the stability of the enlarged hole area and being more conducive to the construction of the pile cap; Through a customized pile foundation and pile cap template, the integrated pouring and forming of the pile foundation and pile cap are realized, reducing the process of breaking the pile head of the pile foundation, improving the integrity and construction efficiency of the pile foundation and pile cap, and shortening the construction period; By setting slurry overflow ports in the pile foundation template area of the pile foundation and pile cap template, the problem of upper floating slurry during the pouring process of the pile foundation is solved, ensuring the quality of the integrated pouring and forming of the pile foundation and pile cap. The integrated forming also improves the integrity and shear resistance of the pile foundation and pile cap. Brief Description of the Drawings

[0022] Figure 1 It is a flow chart of the integrated construction method for the pile foundation and pile cap of the water area slideway of the present invention.

[0023] Figure 2 It is a schematic diagram of the pile foundation hole formation of the slideway of the present invention.

[0024] Figure 3 It is a schematic diagram of the steel casing setting and bottom sealing in the pile foundation enlargement of the present invention.

[0025] Figure 4 is Figure 3 the structural schematic diagram of the airbag device in

[0026] Figure 5 is Figure 3 the structural schematic diagram in which the airbag device in the pile foundation hole is taken out and the pile foundation steel cage and the pile foundation and pile cap template are installed.

[0027] Figure 6 It is a structural schematic diagram of the slurry overflow port set on the side template at the pile top of the present invention.

[0028] Figure 7 It is a structural schematic diagram of the integrated pouring and forming of the pile foundation and pile cap of the present invention with the connecting steel cage and shear-resistant steel sections anchored.

[0029] Figure 8 It is a top view structural schematic diagram of the pile cap steel bars of the present invention.

[0030] Figure 9 It is a structural schematic diagram of the connecting steel cage and shear-resistant steel sections of the present invention.

[0031] In the figure: 1 - formation of the water slide area; 2 - island building platform; 3 - pile foundation hole, 301 - steel casing, 302 - bottom seal; 4 - airbag device, 401 - lower counterweight, 402 - airbag body, 403 - upper lifting rope; 5 - pile foundation reinforcement cage; 6 - pile cap formwork for pile foundation, 601 - slurry overflow port; 602 - side formwork at the pile top; 603 - cover plate; 604 - side formwork of the pile cap; 605 - bottom formwork of the pile cap; 7 - pile cap reinforcement; 8 - pile cap connection structure, 801 - connecting reinforcement cage, 802 - shear-resistant steel section. Detailed implementation method

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] As Figure 1 shown in the water slide pile foundation and pile cap integrated construction method, which includes the following steps:

[0034] Step 1: Build an island in the water slide area and form a hole for the slide pile foundation.

[0035] Step 2: Enlarge the upper part of the pile foundation hole, install the steel casing and the bottom seal.

[0036] Step 3: Install the pile foundation reinforcement cage.

[0037] Step 4: Install the pile cap formwork for the pile foundation.

[0038] Step 5: Precast and install the pile cap reinforcement.

[0039] Step 6: Pour the pile foundation and pile cap concrete integrally.

[0040] Step 7: Anchor the pile cap connection structure.

[0041] Specifically, as Figure 2 shown, in Step 1, in the formation 1 of the water slide area, the island building platform 2 is formed by layered filling, and the height of the island building platform 2 is 0.5 m higher than the highest water level; then a hole is drilled using a hole-forming device to form the pile foundation hole 3. In this engineering example, a rotary drilling rig is used to form the hole.

[0042] As Figure 3 shown, in Step 2, the steps for enlarging the upper part of the pile foundation hole include: replacing the large-diameter drill bit of the rotary drilling rig, concentrically enlarging the upper part of the pile foundation hole 3 to 50 - 100 cm below the pile top elevation of the pile foundation to form an enlarged hole area in the upper part of the pile foundation hole 3; in this example, the controlled depth of the enlarged hole area is 80 cm below the pile top elevation. The diameter of the enlarged hole area should be 2.4 m - 2.6 m to facilitate manual entry into the hole for operations such as formwork support. In this example, the diameter of the enlarged hole area is 2.6 m.

[0043] The steps of installing the steel casing 301 and the bottom sealing 302 include: installing the steel casing 301 for providing support in the reamed area, and after closing the orifice of the pile foundation hole 3 through the airbag device 4, pouring underwater concrete to complete the construction of the bottom sealing 302 in the reamed area. The steel casing 301 is made of 3 cm thick steel plate. In this example, the length of each section of the steel casing 301 is 3 m, and it can be spliced and lengthened according to the depth of the reamed area to provide support for the upper reamed area.

[0044] As Figure 4 shown, the airbag device 4 includes a lower counterweight 401, an airbag body 402 and an upper lifting rope 403 connected in sequence from bottom to top; during bottom sealing, the airbag body 402 is sunk to near the orifice of the pile foundation hole 3 through the lower counterweight 401; the airbag body 402 temporarily closes the orifice of the pile foundation hole 3 by inflation. After the construction of the bottom sealing 302 in the reamed area is completed by pouring underwater concrete, the airbag device 4 is lifted out by deflating the airbag body 402 and using the upper lifting rope 403.

[0045] As Figure 5 shown, in step three, before installing the pile foundation steel cage 5, the slurry in the reamed area is drained by a slurry pump, and the height of the slurry liquid level is lowered into the pile foundation hole 3. When fabricating the pile foundation steel cage 5 and the pile cap steel bars 7, a detailed design is carried out in advance to avoid the main bars of the pile foundation steel cage 5. At the same time, the positioning of the main bars of the pile foundation steel cage 5 is calibrated. Before the pile foundation steel cage 5 is hoisted, installed and fixed, it is adjusted according to the positioning and then fixed.

[0046] As Figure 5 shown, in step four, the pile foundation pile cap formwork 6 includes a plurality of formwork units, and the plurality of formwork units are sequentially assembled along the circumference of the orifice of the pile foundation hole 3 in the reamed area.

[0047] Each formwork unit includes a pile cap side formwork 604, a pile cap bottom formwork 605 and a pile top side formwork 602. Among them, the pile top side formwork 602 encloses a space for pouring the pile top, and the pile top is the part of the pile foundation located in the reamed area; the pile cap bottom formwork 605 is a horizontally arranged fan-shaped structure provided with an outer arc edge and an inner arc edge. The pile cap side formwork 604 abuts against the outer arc edge of the pile cap bottom formwork 605 and extends upward to the pile cap elevation; the pile top side formwork 602 abuts against the inner arc edge of the pile cap bottom formwork 605 and extends downward to the orifice. The pile cap side formwork 604, the pile cap bottom formwork 605 and the pile top side formwork 602 of each formwork unit can be prefabricated into an integral structure in advance. The plurality of formwork units are reinforced and closed by hoop.

[0048] As Figure 6 shown, the pile top side formwork 602 is provided with a slurry overflow port 601 and a cover plate 603 for closing or opening the slurry overflow port 601. The cover plate 603 is opened when pouring pile foundation concrete and closed when pouring pile cap concrete.

[0049] As Figure 7As shown, in Step Five, the pile cap steel bars 7 (also known as the pile cap steel reinforcement cage) are prefabricated and formed in the processing area and then hoisted and installed. Among them, as Figure 8 shown, when prefabricating and processing the pile cap steel bars 7, a rebar-free area of 400mm×400mm needs to be reserved in the central area. When pouring the pile foundation and pile cap concrete, the pouring conduit is lowered to the central area of the pile cap steel bars 7, which is also convenient for anchoring the pile cap connection structure 8 into the concrete in the central area before the initial setting of the pile foundation and pile cap concrete. As Figure 9 shown, the pile cap connection structure 8 includes a connecting steel reinforcement cage 801 and a shear-resistant steel section 802.

[0050] As Figure 7 shown, in Step Six, the outer diameter of the pouring conduit is 300mm. During the pouring of the pile foundation, the slurry overflow port 601 is opened to discharge the slurry. After the slurry overflow port 601 overflows with concrete, the slurry overflow port 601 is closed, and the concrete is poured to the pile cap top elevation to achieve the integrated pouring of the pile foundation and pile cap concrete.

[0051] Before the initial setting of the pile foundation and pile cap concrete, the shear-resistant steel section 802 is first pressed in according to the measurement and positioning, and then the connecting steel reinforcement cage 801 is inserted, and the surface concrete of the bearing platform is leveled manually. Among them, the connecting steel reinforcement cage 801 and the shear-resistant steel section 802 are used to connect the later precast slideway grid beams to enhance the shear resistance performance.

[0052] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A method for integrated construction of pile foundation and pile cap of a water slide, characterized in that: The following steps are involved: Step 1: Build an island in the water slide area and drill holes for the slide pile foundation; Step 2: Expand the upper pile foundation and install the steel casing and bottom cover; Step 3: Install the pile foundation steel cage; Step 4: Install the pile cap formwork, and set an openable and closable overflow port in the pile foundation formwork area; Step 5: Install the pile cap reinforcement and reserve the center area for concrete pouring and anchoring of the pile cap connection structure; Step 6: pouring concrete for the pile foundation and pile cap, and closing the overflow port after discharging the slurry to achieve integrated forming of the pile foundation and pile cap; Step 7: Anchor the pile cap connection structure before the initial setting of the concrete to connect the later slideway cross beam.

2. The method for integrated construction of pile foundation and pile cap of a water slide according to claim 1, characterized in that: In the step 2, the upper pile foundation hole enlarging step includes: concentrically enlarging the upper part of the pile foundation hole to 50 to 100 cm below the pile foundation top elevation, forming an enlarged hole area in the upper part of the pile foundation hole; the steel casing and bottom sealing step includes: installing a steel casing for providing support in the enlarged hole area, and closing the hole mouth of the pile foundation hole by an airbag device, and then pouring underwater concrete to complete the bottom sealing of the enlarged hole area.

3. The method for integrated construction of pile foundation and pile cap of a water slide according to claim 2, characterized in that: The airbag device comprises a lower counterweight, an airbag body and an upper suspension rope which are sequentially connected from bottom to top; the lower counterweight is suspended in the pile foundation hole; and the airbag body closes the hole by inflation.

4. The method for integrated construction of pile foundation and pile cap of a water slide according to claim 2, characterized in that: In the step 2, after the bottom sealing of the expanded hole area is completed, the airbag device is removed by deflating the airbag body.

5. The method for integrated construction of pile foundation and pile cap of a water slide according to claim 2, characterized in that: In the step three, before installing the pile foundation reinforcement cage, the steps include: using a mud pump to drain the mud in the expansion area and lowering the mud liquid level to the pile foundation hole.

6. The method for integrated construction of pile foundation and pile cap of a water slide according to claim 2, characterized in that: In the step 4, the pile foundation cap template includes a plurality of template units, and the plurality of template units are sequentially assembled in the expansion area along the circumference of the hole opening of the pile foundation hole.

7. The method for integrated construction of pile foundation and pile cap of a water slide according to claim 6, characterized in that: Each of the template units includes a pile cap side template, a pile cap bottom template and a pile top side template; the pile cap bottom template is a fan-shaped structure configured with an outer arc edge and an inner arc edge, the pile cap side template is pressed against the outer arc edge of the pile cap bottom template and extends upward to the pile cap elevation; the pile top side template is pressed against the inner arc edge of the pile cap bottom template and extends downward to the hole.

8. The method for integrated construction of pile foundation and pile cap of a water slide according to claim 7, characterized in that: The pile top side template is provided with a grout overflow port and a cover plate for closing or opening the grout overflow port.

9. The method for integrated construction of pile foundation and pile cap of a water slide according to claim 1, characterized in that: The pile cap reinforcement is a prefabricated part. When the pile cap reinforcement is prefabricated, a non-reinforced area is reserved in the central area thereof; when pouring the pile foundation and pile cap concrete, a pouring conduit is lowered to the central area of ​​the pile cap reinforcement.

10. The method for integrated construction of pile foundation and pile cap of a water slide according to claim 9, characterized in that: In step seven, the pile cap connection structure includes connecting a steel cage and shear-resistant steel; before the initial setting of the concrete of the pile foundation and the pile cap, the prefabricated connecting steel cage and the shear-resistant steel are anchored into the concrete of the central area.

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