Prefabricated pile foundation construction platform and pile foundation construction method

Abstract

The present invention discloses an assembled pile foundation construction platform and pile foundation construction method, comprising: a plurality of unit blocks detachably joined together, some of the unit blocks having a notch on one side, the notches of two adjacent unit blocks enclosing a construction tunnel; the unit blocks comprising a load-removing plate for resting on the upper surface of a silt foundation; a plurality of longitudinal beams fixed to the load-removing plate; and a plurality of transverse beams fixed to the plurality of longitudinal beams, the longitudinal beams being arranged along the length of the load-removing plate, the plurality of longitudinal beams being spaced apart along the width of the load-removing plate, the transverse beams being arranged along the width of the longitudinal beams, and the plurality of transverse beams being spaced apart along the length of the longitudinal beams; a blocking plate detachably connected to the unit blocks; and at least three anchor piles arranged circumferentially of the assembled unit blocks, buried in the silt foundation, with the unit blocks connected to the at least three anchor piles. The present invention solves the problems of existing bored pile foundation construction platforms for silt geology, such as insufficient bearing capacity and high steel consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to an assembled pile foundation construction platform and a pile foundation construction method. Background Art

[0002] Bored pile foundations are widely used in bridge pier construction in water- and muddy terrain. A prerequisite for bored pile foundation construction is the construction platform, which provides a surface area for construction personnel and equipment to operate and for the storage of tools and materials. Construction platforms in muddy terrain often employ earth fill or cofferdams, but improper operation often results in insufficient foundation bearing capacity, leading to safety accidents.

[0003] The construction plan for a pile foundation construction platform not only considers the current status of large-scale equipment, construction schedule requirements, and economic conditions, but also hinges on the hydrological conditions at the pier location, geological conditions such as the riverbed topography and overburden thickness. Generally, drilling platforms for pile foundations of piers in water utilize a combination of steel pipe piles and upper steel beams, which consumes a large amount of steel. For shallow-water pier construction, island cofferdams or direct earthfill are often used to create the construction platform.

[0004] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0005] In order to overcome the defects of the existing technology, an assembled pile foundation construction platform and a pile foundation construction method are now provided to solve the problems of insufficient bearing capacity and large steel consumption of the existing bored pile foundation construction platform in silt geology.

[0006] To achieve the above purpose, an assembled pile foundation construction platform is provided, comprising:

[0007] A plurality of unit blocks detachably connected together, a notch being provided on one side of some of the unit blocks, the notches of two adjacent unit blocks enclosing each other to form a construction channel, a plurality of the unit blocks with some notches being connected together to form a positioning area, and a plurality of the remaining complete unit blocks being connected together to form a force-bearing area for supporting a drilling machine, the unit blocks comprising a force unloading plate for resting on the upper surface of a muddy foundation, a plurality of longitudinal beams fixed on the force unloading plate, and a plurality of transverse beams fixed on the plurality of longitudinal beams, the longitudinal beams being arranged along the length direction of the force unloading plate, the plurality of longitudinal beams being arranged at intervals along the width direction of the force unloading plate, the transverse beams being arranged along the width direction of the longitudinal beams, and the plurality of transverse beams being arranged at intervals along the length direction of the longitudinal beams;

[0008] A blocking plate for blocking the construction channel, detachably connected to the unit block; and

[0009] At least three anchor piles are arranged along the circumferential direction of the plurality of unit blocks after splicing, and are buried in the silt foundation. The plurality of unit blocks after splicing are connected to the at least three anchor piles.

[0010] Furthermore, the longitudinal beam includes an upper flange plate, a lower flange plate and a first web plate, the first web plate is connected between the middle parts of the upper flange plate and the lower flange plate, and the lower flange plate is fixed to the load unloading plate.

[0011] Furthermore, the opposite sides of the webs of the longitudinal beams of two adjacent unit plates are detachably connected together via a first connecting plate.

[0012] Furthermore, a first through-hole is provided at the end of the web, and a second through-hole is provided at each end of the first connecting plate. The two ends of the first connecting plate are respectively overlapped on the webs of the longitudinal beams of the two adjacent unit plates, and the second through-hole of the first connecting plate is connected to the first through-hole of the web, and tension screws can be movably passed through the first through-hole and the second through-hole.

[0013] Furthermore, the cross beam includes a support plate, and opposite sides of the support plate extend downward to form the support flange plates, and the support flange plates are fixed to the upper flange plates of the plurality of longitudinal beams.

[0014] Furthermore, the cross beams of the two adjacent unit blocks are detachably connected together via a second connecting plate, and opposite sides of the second connecting plate are detachably overlapped with the support plates of the cross beams of the two adjacent unit blocks.

[0015] Furthermore, a lifting lug is formed on the sealing plate.

[0016] Furthermore, the spacing between the longitudinal beams is greater than the spacing between the transverse beams.

[0017] The present invention provides a pile foundation construction method using an assembled pile foundation construction platform, comprising the following steps:

[0018] Driving at least three anchor piles in the muddy foundation, such that the at least three anchor piles are arranged along the circumference of the installation position of the assembled pile foundation construction platform;

[0019] Laying a plurality of unit blocks on the muddy foundation and detachably splicing the unit blocks together so that the gaps between two adjacent unit blocks enclose each other to form a construction channel, and aligning the construction channel with the pile foundation construction position;

[0020] A blocking plate is detachably connected to the construction tunnel to temporarily block the construction tunnel;

[0021] The drilling machine will be hoisted and placed on the multiple unit boards after splicing;

[0022] The plugs are removed one by one to open a construction channel, and a drilling machine is used to drill into the silt foundation through the construction channel to form a pile hole;

[0023] A bored pile is formed by pouring in each of the pile holes.

[0024] The beneficial effect of the present invention is that the prefabricated pile foundation construction platform of the present invention greatly reduces the amount of steel used in steel structure bridges by adopting a prefabricated steel structure platform, is light and fast, and is conducive to construction. The prefabricated pile foundation construction platform of the present invention has a reasonable structural force and greatly reduces the difficulty of construction. The prefabricated pile foundation construction platform of the present invention uses an assembly construction method of back-field assembly and on-site assembly to split each structure into several units, and each unit is spliced ​​on-site by bolts, which greatly improves the degree of assembly of steel components and adopts relatively light construction equipment, thereby shortening the construction period and reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 It is a structural schematic diagram of an assembled pile foundation construction platform according to an embodiment of the present invention.

[0027] Figure 2 Schematic diagram of the structure of a unit block according to an embodiment of the present invention.

[0028] Figure 3 Schematic diagram of the structure of the construction tunnel of an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] Reference Figures 1 to 3 As shown, the present invention provides an assembled pile foundation construction platform, comprising: a plurality of unit blocks 1, a blocking plate 2 and at least three anchor piles 3.

[0032] The multiple unit blocks 1 are detachably connected together. In this embodiment, the multiple unit boards are arranged in a matrix. Some of the unit blocks 1 have a notch on one side. The notches of two adjacent unit blocks 1 enclose a construction tunnel 10.

[0033] In this embodiment, some of the unit blocks with gaps are spliced ​​together to form a positioning area, and the remaining complete unit blocks are spliced ​​together to form a stress-bearing area. The stress-bearing area is used to withstand the weight pressure of the drilling machine and the construction pressure.

[0034] Specifically, each unit block 1 includes a load plate 11, multiple longitudinal beams 12, and multiple transverse beams 13. The load plate 11 rests on the upper surface of the muddy foundation. Multiple longitudinal beams 12 are fixed to the load plate 11. Multiple transverse beams 13 are fixed to the multiple longitudinal beams 12. The longitudinal beams 12 are arranged along the length of the load plate 11. The multiple longitudinal beams 12 are spaced apart along the width of the load plate 11. The transverse beams 13 are arranged along the width of the longitudinal beams 12. Multiple transverse beams 13 are spaced apart along the length of the longitudinal beams 12.

[0035] The blocking plate 2 is detachably connected to the unit block 1. The blocking plate 2 is used to temporarily block the construction channel 10.

[0036] At least three anchor piles 3 are arranged along the circumferential direction of the assembled unit blocks 1. The at least three anchor piles 3 are buried in the muddy foundation. The assembled unit blocks 1 are connected to the at least three anchor piles 3.

[0037] At least three anchor piles are first driven into the muddy foundation, followed by assembly of multiple unit blocks, which are then connected to the anchor piles. During drilling, a blocking plate is removed, and the drilling machine is positioned over the assembled unit blocks. The pile hole is then drilled through the construction tunnel, where the blocking plate has been removed, and the bored pile is cast.

[0038] The prefabricated pile foundation construction platform of the present invention greatly reduces the amount of steel used in steel structure bridges by adopting a prefabricated steel structure platform. It is light, fast, and convenient for construction. The prefabricated pile foundation construction platform of the present invention has a reasonable structural force and greatly reduces the difficulty of construction. The prefabricated pile foundation construction platform of the present invention uses an assembly construction method of back-field assembly and on-site assembly to split each structure into several units. Each unit is spliced ​​on-site by bolts, which greatly improves the degree of assembly of steel components and adopts relatively light construction equipment, thereby shortening the construction period and reducing construction costs.

[0039] In this embodiment, see Figure 3 The longitudinal beam 12 includes an upper flange plate, a lower flange plate and a first web plate. The first web plate is connected between the middle portions of the upper flange plate and the lower flange plate. The lower flange plate is fixed to the load plate 11.

[0040] As a preferred embodiment, the longitudinal beams are I-shaped steel beams. The spacing between the longitudinal beams 12 is greater than the spacing between the transverse beams 13.

[0041] In this embodiment, continue to refer to Figure 3 The opposite sides of the webs of the longitudinal beams 12 of two adjacent unit panels are detachably connected together through a first connecting plate 5 .

[0042] The web has a first through-hole at its end. The first connecting plate 5 has a second through-hole at each end. The ends of the first connecting plate 5 overlap the webs of the longitudinal beams 12 of two adjacent unit panels. The second through-holes of the first connecting plate 5 communicate with the first through-holes of the webs. Tension screws are movably inserted through the first and second through-holes.

[0043] The cross beam 13 includes a support plate, and opposite sides of the support plate extend downward to form support flange plates, which are fixed to the upper flange plates of the plurality of longitudinal beams 12. In this embodiment, the cross beam is a channel steel.

[0044] The cross beams 13 of two adjacent unit blocks 1 are detachably connected together via a second connecting plate 6 , and opposite sides of the second connecting plate 6 are detachably overlapped with support plates of the cross beams 13 of the two adjacent unit blocks 1 .

[0045] A lifting lug is formed on the blocking plate 2. When the construction channel needs to be opened, the blocking plate in the corresponding construction channel can be hoisted.

[0046] In this embodiment, when the drilling machine (crawler crane) inserts and removes the casing, the steel casing is 15t, the crawler crane is 80t, and the vibratory hammer is 5t; the lifting operation is performed on the load-bearing area of ​​the crawler crane platform, the contact area between the crawler and the support plate of the beam is 700mm×6000mm, and the crawler spacing is 4500mm.

[0047] The prefabricated pile foundation construction platform of the present invention includes 12 unit blocks, each measuring 3m x 6m. The present invention provides a prefabricated pile foundation construction platform with an overall size of 12m x 18m. Except for the bolted connection points, the remaining components are firmly welded. The unloading plate and the I-beam are spot welded, with a spacing of no less than 18mm and a weld width of no less than 6mm. The contact points between the I-beam and the crossbeam are fully welded, except for the use of M14 stud bolts between the prefabricated components.

[0048] The load-releasing plate is made of 10mm steel plate, the longitudinal beam is made of 25a steel with a spacing of 500mm, and the cross beam is channel steel with a spacing of 250mm.

[0049] Before installing the prefabricated pile foundation construction platform of this invention, the original soil must be properly prepared and leveled and compacted. After the platform's position is staked out, an I-beam is driven into each of the platform's four corners as an anchor pile. The anchor piles are driven into the soil to a depth of at least 6 meters and connected to the four unit blocks at the platform's corners using φ20 steel bars in the shape of an "X."

[0050] The assembled pile foundation construction platform of the present invention is suitable for SP3 pile foundation construction, but is not suitable for water-borne pile foundation construction.

[0051] The present invention provides a pile foundation construction method using an assembled pile foundation construction platform, comprising the following steps:

[0052] S1: driving at least three anchor piles 3 in the muddy foundation, so that the at least three anchor piles 3 are arranged along the circumference of the installation position of the assembled pile foundation construction platform.

[0053] In this embodiment, there are four anchor piles, which are arranged in a matrix.

[0054] S2: laying multiple unit blocks 1 on the mud foundation, and detachably splicing the multiple unit blocks 1 together so that the gaps between two adjacent unit blocks 1 are enclosed to form a construction channel 10, and the construction channel 10 is aligned with the pile foundation construction position.

[0055] When assembling multiple unit blocks, the unit blocks with gaps are arranged in pairs so that the gaps of two adjacent unit blocks 1 are enclosed to form a construction channel 10, and the construction channel 10 is aligned with the pile foundation construction position.

[0056] Multiple notched unit blocks are joined together to form a positioning zone for locating the pile hole. On the other side of the installation location, multiple unnotched unit blocks are joined together to form a load-bearing zone. The load-bearing zone is located to one side of the positioning zone and is integrally connected to it.

[0057] S3: Removably connect the blocking plate 2 to the construction tunnel 10 to temporarily block the construction tunnel 10 .

[0058] S4: The drilling machine 4 is hoisted and placed on the multiple unit panels after splicing.

[0059] The drilling machine is placed in the stress-bearing area of ​​the plurality of unit plates, and the drill rod of the drilling machine is aligned with a construction channel.

[0060] S5: The plugs are removed one by one to open a construction tunnel 10, and a drilling machine is used to drill into the mud foundation through the construction tunnel 10 to form a pile hole.

[0061] After the drilling machine is set in place, the blocking plate of a construction channel is removed, and the drilling machine is used to drill a pile hole in the mud foundation through the construction channel 10. Afterwards, each construction channel is constructed one by one.

[0062] S6: Casting in each pile hole to form bored cast-in-place piles.

[0063] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. An assembled pile foundation construction platform, characterized in that: include: A plurality of unit blocks detachably connected together, a notch being provided on one side of some of the unit blocks, the notches of two adjacent unit blocks enclosing each other to form a construction channel, a plurality of the unit blocks with some notches being connected together to form a positioning area, and a plurality of the remaining complete unit blocks being connected together to form a force-bearing area for supporting a drilling machine, the unit blocks comprising a force unloading plate for resting on the upper surface of a muddy foundation, a plurality of longitudinal beams fixed on the force unloading plate, and a plurality of transverse beams fixed on the plurality of longitudinal beams, the longitudinal beams being arranged along the length direction of the force unloading plate, the plurality of longitudinal beams being arranged at intervals along the width direction of the force unloading plate, the transverse beams being arranged along the width direction of the longitudinal beams, and the plurality of transverse beams being arranged at intervals along the length direction of the longitudinal beams; A blocking plate for blocking the construction channel, detachably connected to the unit block; as well as At least three anchor piles are arranged along the circumferential direction of the plurality of unit blocks after splicing, and are buried in the silt foundation. The plurality of unit blocks after splicing are connected to the at least three anchor piles.

2. The assembled pile foundation construction platform according to claim 1, characterized in that: The longitudinal beam includes an upper flange plate, a lower flange plate and a first web plate, wherein the first web plate is connected between the middle portions of the upper flange plate and the lower flange plate, and the lower flange plate is fixed to the load unloading plate.

3. The assembled pile foundation construction platform according to claim 2, characterized in that: The opposite sides of the webs of the longitudinal beams of two adjacent unit plates are detachably connected together via a first connecting plate.

4. The assembled pile foundation construction platform according to claim 3, characterized in that: A first through-hole is provided at the end of the web, and a second through-hole is provided at both ends of the first connecting plate. The two ends of the first connecting plate are respectively overlapped on the webs of the longitudinal beams of the two adjacent unit plates, and the second through-hole of the first connecting plate is connected to the first through-hole of the web, and tension screws can be movably passed through the first through-hole and the second through-hole.

5. The assembled pile foundation construction platform according to claim 2, characterized in that: The cross beam includes a supporting plate, and opposite sides of the supporting plate extend downward to form the supporting flange plates, and the supporting flange plates are fixed to the upper flange plates of the plurality of longitudinal beams.

6. The assembled pile foundation construction platform according to claim 5, characterized in that: The cross beams of two adjacent unit blocks are detachably connected together via a second connecting plate, and opposite sides of the second connecting plate are detachably overlapped with the supporting plates of the cross beams of the two adjacent unit blocks.

7. The assembled pile foundation construction platform according to claim 1, characterized in that: A lifting lug is formed on the blocking plate.

8. The assembled pile foundation construction platform according to claim 1, characterized in that: The spacing between the longitudinal beams is greater than the spacing between the transverse beams.

9. A pile foundation construction method using the assembled pile foundation construction platform according to any one of claims 1 to 8, characterized in that: The following steps are involved: Driving at least three anchor piles in the muddy foundation, such that the at least three anchor piles are arranged along the circumference of the installation position of the assembled pile foundation construction platform; Laying a plurality of unit blocks on the muddy foundation and detachably splicing the unit blocks together so that the gaps between two adjacent unit blocks enclose each other to form a construction channel, and aligning the construction channel with the pile foundation construction position; A blocking plate is detachably connected to the construction tunnel to temporarily block the construction tunnel; The drilling machine will be hoisted and placed on the multiple unit boards after splicing; The blocking plates are removed one by one to open a construction channel, and a drilling machine is used to drill into the silt foundation through the construction channel to form a pile hole; A bored pile is formed by pouring in each of the pile holes.

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