CN114673153A - Construction method of super long diameter pile foundation casing structure in complex stratum - Google Patents

Abstract

The invention relates to a construction method of a complex stratum overlong large-diameter pile foundation casing structure, which comprises the following steps: preparing a technology; sinking the steel pipe pile on the initial working platform; and (5) sinking the steel casing on the initial working platform. The beneficial effects of the invention are: the initial working platform adopts the steel pipe piles as the bearing structures, and the pile casing area working platform adopts the steel casing as the bearing structures to be erected, so that the construction period is greatly shortened, and meanwhile, the platform erection materials are saved. The steel protects a sunken leading truck of section of thick bamboo as the steel and protects a point contact formula leading truck, protects a central point with the help of the leading truck location steel simultaneously and puts, is convenient for be under construction and guarantees that protecting a section of thick bamboo sinks smoothly and the development of follow-up work. Detecting the horizontal position of the steel casing by adopting a casing center positioning line, and detecting the verticality of the steel casing by using a laser pen and a laser receiving surface; and correcting the horizontal position and the verticality by using hydraulic screw jacks at different positions. The construction precision of hoisting the steel casing is greatly improved, disturbance is reduced, and the construction quality is improved.

Description

Construction method of super-long diameter pile foundation casing structure in complex stratum

technical field

The invention belongs to the technical field of building construction, and in particular relates to a construction method of a super-long diameter pile foundation casing structure in complex strata.

Background technique

Bored piles are a form of deep foundation commonly used in large buildings and bridge construction. In recent years, my country has developed rapidly in the field of construction, the span of bridges has continued to increase, and the height of buildings has become higher and higher. Bored piles are also getting longer in length and larger in diameter.

Affected by the complex geological conditions in my country, during the construction of pile foundations, it is often encountered that the groundwater is relatively abundant, and the geology of the boreholes is mostly silt, fine sand, medium-coarse sand and gravel layers and other strata that are prone to collapse; The permeability coefficient of the stratum is relatively large, and there is a possibility of a large amount of water and sand gushing during the construction, which brings many difficulties to the pile foundation construction.

When encountering geological conditions similar to slump-prone formations during construction, steel casings can be installed to reduce disturbance to the alternating silty and fine sand layers. However, the construction of the traditional steel casing construction platform consumes a large amount of steel, and the amount of welding is large, and it is easy to cause waste in the face of the thick interactive fine sand layer.

Therefore, there is an urgent need to find a construction method for a super-long diameter pile foundation casing structure in complex strata, which is reasonable in structure, stable in installation, convenient in construction, economical and environmentally friendly.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a construction method for a super-long diameter pile foundation casing structure in a complex stratum.

The construction method of the super-long diameter pile foundation casing structure in the complex stratum includes the following steps:

S1. Technical preparation: Prefabricated steel casing, steel casing point-contact guide frame, steel pipe pile guide frame and steel truss in the factory. After the above prefabricated components are qualified after factory inspection, they will be transported to the construction site by barge;

S2, sink the steel pipe pile on the starting working platform;

S3, sink the steel casing on the starting working platform;

S4. Setting up of the working platform in the protective tube area;

S5. The steel casing on the starting working platform sinks;

S6. The point-contact guide frame of the steel casing moves;

S7. Subsequent steel casing sinks;

S8. Steel pipe pile construction: After sinking all steel casings, follow-up steel pipe pile construction is carried out.

Preferably, step S2 is specifically as follows: the initial working platform is located on the upstream side of the drilling platform; the steel pipe pile guide frame installed on the piling ship is used for positioning, and the piling ship is used to hoist the vibrating hammer to vibrate and sink; After straightening, send the steel pipe pile into the guide frame of the steel pipe pile, measure and adjust the plane position and inclination of the steel pipe pile. Set the location.

Preferably, step S3 is specifically as follows: installing a point-contact guide frame for the steel casing at a designated position, hoisting the steel casing with a piling ship, keeping the steel casing vertical, and slowly sliding the steel casing when the tide is flat or the flow rate is small , until the steel casing is stable in the mud, and the piling ship is decoupled.

Preferably, step S4 is specifically as follows: the piling ship hoists the steel truss, and the steel truss is installed on the completed starting work platform or the top of the steel casing; the cantilever type casing guide platform is arranged at the front end of the steel truss; the surface of the steel truss is laid Surface layer of working platform in casing area.

Preferably, step S5 is specifically as follows: lifting the steel casing with a piling boat, adjusting the plane position and verticality of the steel casing until reaching the set plane position and verticality; the piling boat is hooked, and the steel casing follows the steel casing. The point-contact guide frame is lowered to the bottom of the river and inserted into the soil, and the piling boat is decoupled.

Preferably, step S6 is specifically as follows: after the sinking of the steel casing is completed, the vibrating hammer is lifted away, and the connection between the point-contact guide frame of the steel casing and the anchor beam is removed; the point-contact guide frame of the steel casing is moved to another Position the steel casing, repeat step S5, sink the steel casing, and connect the point-contact guide frame of the steel casing to the starting working platform and the adjacent steel casing.

Preferably, step S7 is specifically as follows: measuring the position of the first row of steel casings, leveling the corbels welded on the steel casings; placing the support beam, secondary beam and anchor beam on the first row of steel casings, And weld with the corbel on the steel casing, hoist and anchor the steel casing point-contact guide frame on the front and rear anchor beams; repeat the above steps until all the steel casings are sunk.

The super-long diameter pile foundation casing structure in complex stratum is obtained according to the above method.

The beneficial effects of the present invention are:

The initial working platform of the present invention adopts steel pipe piles as the load-bearing structure, and the working platform in the casing area adopts the steel casing as the load-bearing structure for erection, which greatly saves the construction period and saves the platform erection materials. The invention adopts the point-contact guide frame of the steel casing as the guide frame for the sinking of the steel casing, and simultaneously locates the center position of the steel casing by means of the guide frame; the guide frame is divided into upper and lower parts, which is convenient for construction and ensures the smooth sinking of the casing and subsequent development of work. The invention adopts the protective tube center positioning line to detect the horizontal position of the steel protective tube, and detects the verticality of the steel protective tube through a laser pointer and a laser receiving surface; It greatly improves the construction accuracy of steel casing hoisting, reduces disturbance and improves construction quality.

The super-long diameter pile foundation casing structure of the invention is reasonable in design, can effectively improve the construction speed, reduce the disturbance of the interactive fine silt layer during the construction process, is economical and environmentally friendly, and reduces the waste of resources.

Description of drawings

Fig. 1 is the overall structural schematic diagram of the super-long diameter pile foundation casing structure in complex strata;

Fig. 2 is the front view of the starting working platform;

Figure 3 is a top view of the initial working platform;

Figure 4 is a schematic diagram of a steel pipe pile piling ship;

Fig. 5 is the schematic diagram of the guide frame of the steel pipe pile;

Figure 6 is a front view of the working platform in the protective tube area;

Figure 7 is a top view of the working platform in the protective tube area;

Fig. 8 is the top view of the protective tube guide frame platform;

Fig. 9 is a schematic diagram of a point-contact guide frame of a steel casing, wherein Fig. 9(a) is a front view, and Fig. 9(b) is a top view;

Figure 10 is a schematic diagram of the verticality dynamic adjustment system;

Figure 11 is a schematic diagram of a portable level.

Explanation of reference numerals: 1-point-contact guide frame for steel casing, 2-steel casing positioning and hoisting device, 3-dynamic adjustment system for the position and verticality of steel casing, 4-starting working platform, 5- casing Area working platform, 6-steel casing, 7-corbel, 8-connecting beam, 9-steel pipe pile, 10-upper level connection, 11-lower level connection, 12-drilling platform, 13-support beam, 14 - Secondary beam, 15- Anchor beam, 16- Rigid panel, 17- Railing, 18- Piling boat, 19- Vibrating hammer, 20- Steel pipe pile guide frame, 21- Bow, 22- Channel steel frame, 23- Jack , 24-steel truss, 25-surface layer, 26-cantilever guard guide frame platform, 27-lifting lug, 28-bolt, 29-cantilever beam, 30-support, 31-guard cylinder center positioning line, 32- Connecting rod, 33-section steel rod, 34-section steel frame, 35-lock rod, 36-upper guide frame, 37-lower guide frame, 38-hydraulic screw jack, 39-lower hydraulic screw jack, 40-portable level, 41-laser pointer, 42-laser pointer guide tube, 43-laser receiving surface, 44-level bubble, 45-permissible interval of verticality, 46-upper hydraulic screw jack.

Detailed ways

The present invention will be further described below in conjunction with the embodiments. The following examples are illustrative only to aid in the understanding of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, the present invention can also be modified several times, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

As an embodiment, as shown in Figure 1 to Figure 11, the construction method of the super long diameter pile foundation casing structure in complex strata includes the following steps:

S1. Technical preparation: Prefabricated steel casing 6, steel casing point-contact guide frame 1, steel pipe pile guide frame 20 and steel truss 24 in the factory. After the above prefabricated components have passed the factory inspection, they will be transported to the construction site by barge;

S2, laying down the steel pipe pile 9 on the starting working platform 4: the starting working platform 4 is located on the upstream side of the drilling platform 12; Lift the vibrating hammer 19 to vibrate and sink; when the steel pipe pile 9 is lifted upright, the steel pipe pile 9 is sent into the steel pipe pile guide frame 20, and the plane position and inclination of the steel pipe pile 9 are measured and adjusted. After the plane position and inclination of the pile 9 meet the construction requirements, the vibrating hammer 19 is vibrated and sunk to the set position;

S3, sink the steel casing 6 on the starting working platform 4: install the steel casing point-contact guide frame 1 at the designated position, lift the steel casing 6 with the piling ship 18, and keep the steel casing 6 vertical. When the tide is flat or the flow rate is small, slowly slide the steel casing 6 down until the steel casing 6 is stably immersed in the mud, and the piling ship 18 is decoupled;

S4. Setting up of the working platform 5 in the protective tube area: the steel truss 24 is hoisted by the piling ship 18, and the steel truss 24 is installed on the top of the completed initial working platform 4 or the steel protective tube 6; The platform 26 is laid; the surface layer of the working platform 5 in the casing area is laid on the surface of the steel truss 24;

S5. The steel casing 6 on the initial working platform 4 sinks: lift the steel casing 6 with the piling boat 18, adjust the plane position and verticality of the steel casing 6 until the set plane position and verticality are reached; The boat 18 is hooked, the steel casing 6 is lowered to the bottom of the river along the point-contact guide frame 1 of the steel casing and inserted into the soil, and the piling boat 18 is decoupled;

S6. The steel casing point-contact guide frame 1 moves: after the steel casing 6 sinks, the vibrating hammer 19 is lifted away, and the connection between the steel casing point-contact guide frame 1 and the anchor beam 15 is removed; The point-contact guide frame 1 is moved to another steel casing for positioning, and step S5 is repeated, the steel casing 6 is lowered, and the point-contact guide frame 1 of the steel casing is connected to the starting working platform 4 and the adjacent steel casing 6 connect;

S7. Subsequent steel casings are placed: measure the position of the first row of steel casings 6, and level the corbels 7 welded on the steel casings 6; place the support beam 13, the secondary beam 14 and the anchor beam 15 to the first row A row of steel casings 6 is welded to the corbels 7 on the steel casings 6, and the point-contact guide frame 1 of the steel casings is hoisted and anchored on the front and rear anchor beams 15; the above steps are repeated until all the steel casings are sunk. Guard 6;

S8. Construction of steel pipe piles 9: After sinking all the steel casings 6, the subsequent construction of steel pipe piles 9 is carried out.

The super-long diameter pile foundation casing structure obtained according to the above method includes a steel casing working platform, a steel casing point-contact guide frame 1, a steel casing positioning and hoisting device 2, a steel casing position and verticality Dynamic adjustment system 3; the steel casing working platform is the construction platform where the steel casing 6 sinks, including the initial working platform 4 and the casing working platform 5 located on the upstream side of the drilling platform 12; the steel casing positioning and hoisting device 2 includes a piling ship 18 and a vibratory hammer 19; a dynamic adjustment system for the position and verticality of the steel casing 3 includes a plane position measurement rectification device and a verticality measurement rectification device;

The starting working platform 4 is supported by steel pipe piles 9, and the steel pipe piles 9 are welded with profiled steel up and down in parallel as the upper level parallel connection 10 and the lower level parallel connection 11; a drilling platform 12 is set up on the steel pipe pile 9; The platform 12 includes a support beam 13, a secondary beam 14, an anchor beam 15, a steel panel 16 and a railing 17; Secondary beam 14 and anchor beam 15;

The protective tube guide frame platform 26 includes a cantilever beam 29, an anchor beam 15, a support 30 and a protective tube center positioning line 31; the rear end of the protective tube guide frame platform 26 is welded on the connecting rod 32, and the front end of the protective tube guide frame platform 26 is provided with support The seat 30, the support 30 is connected with the upper end support 30 of the connecting rod 32 through the section steel tie rod 33; the cantilever beam 29 is arranged in parallel, and the anchor beam 15 constitutes the main structure of the shield guide frame platform 26; the front end of the cantilever beam 29 is arranged with supports 30; the point-contact guide frame 1 of the steel casing is anchored on the upper end of the anchor beam 15;

A steel pipe pile guide frame 20 is provided at the bow 21 of the piling ship 18, and the steel pipe pile 9 is placed in the steel pipe pile guide frame 20; Channel steel frame 22 and jack 23;

The working platform 5 in the protective tube area includes a steel protective tube 6, a corbel 7, a connecting beam 8, a steel truss 24, a surface layer 25 and a protective tube guide frame platform 26; The connecting beam 8 is erected; the steel truss 24 is erected on the steel casing 6 and the connecting beam 8; the surface layer 25 is laid on the steel truss 24, and the railing 17 is erected on the surface layer 25; the steel truss 24 is provided with lifting ears 27; The front end of 24 is bolted with bolts 28 laterally to the platform 26 of the shield guide frame. The steel casing 6 set on the working platform 5 in the casing area serves as the load-bearing structure of the drilling platform 12 .

The plane of the point-contact guide frame 1 of the steel casing is a square ring that opens to one side. The upper and lower layers of the point-contact guide frame 1 are connected by bolts 28. The upper and lower layers of the point-contact guide frame 1 are connected by bolts 28. The two layers are respectively arranged on the upper and lower layers of the drilling platform 12; the main body of the point-contact guide frame 1 of the steel casing is composed of a steel frame 34, and the open end of the point-contact guide frame 1 of the steel casing is provided with a locking rod 35; the upper layer The guide frame 36 is erected above the drilling platform 12 , and the top and bottom ends of the upper guide frame 36 and the bottom end of the lower guide frame 37 are arranged with four hydraulic screw jacks 38 that are perpendicular to each other.

A vibrating hammer 19 is installed on the top of the steel casing 6 , and the vibrating hammer 19 is connected to the hook of the piling ship 18 .

In the verticality dynamic adjustment system 3: the plane position measurement and correction device includes the steel casing point contact guide frame 1 and the lower hydraulic screw jack 39; the center of the steel casing point contact guide frame 1 and the casing center positioning line 31 coincide; the lower layer The hydraulic screw jack 39 is installed on the bottom of the upper guide frame 36; the steel protective tube 6 is set at the set distance between the steel protective tube 6 and the inner edge of the point-contact guide frame 1; the verticality measurement and deviation correction device includes a portable level 40, a laser pointer 41 and a laser pointer guide tube 42; the portable level 40 includes a laser receiving surface 43 and a level bubble 44; the laser receiving surface 43 is divided into a verticality allowable section 45; Outside the top; the top of the steel casing point-contact guide frame 1 is provided with an upper hydraulic screw jack 46 .

The steel casing 6 extends through the steel casing point-contact guide frame 1 into the river bottom soil layer; the steel casing point-contact guide frame 1 and the anchor beam 15 are detachably connected.

Claims (8)

1. the construction method of a complex stratum super long diameter pile foundation casing structure, is characterized in that, comprises the following steps: S1. Technical preparation: After the factory prefabricated steel casing (6), steel casing point-contact guide frame (1), steel pipe pile guide frame (20) and steel truss (24), the above prefabricated components have passed the factory inspection. Transported by barge to the construction site; S2, sink the steel pipe pile (9) on the starting working platform (4); S3, sink the steel casing (6) on the starting working platform (4); S4. The working platform (5) in the protection tube area is set up; S5. The steel casing (6) on the starting working platform (4) sinks; S6. The point-contact guide frame (1) of the steel casing moves; S7. Subsequent steel casing sinks; S8. Construction of steel pipe piles (9): After sinking all the steel casings (6), follow-up construction of the steel pipe piles (9) is carried out. 2. according to the construction method of the complex stratum super long diameter pile foundation casing structure according to claim 1, it is characterized in that, step S2 is specifically: starting working platform (4) is positioned on the upstream side of drilling platform (12); The steel pipe pile guide frame (20) installed on the piling ship (18) is positioned, and the vibrating hammer (19) is hoisted by the piling ship (18) to vibrate and sink; when the steel pipe pile (9) is lifted upright, the The steel pipe pile (9) is sent into the steel pipe pile guide frame (20), and the plane position and inclination of the steel pipe pile (9) are measured and adjusted. When the plane position and inclination of the steel pipe pile (9) meet the construction requirements , and vibrate the vibrating hammer (19) down to the set position. 3. according to the construction method of the complex stratum super long diameter pile foundation casing structure according to claim 2, it is characterized in that, step S3 is specifically: install the steel casing point-contact guide frame (1) at the designated position, use The piling ship (18) lifts the steel casing (6), the steel casing (6) is kept vertical, and the steel casing (6) is slowly lowered when the tide is flat or the flow velocity is small, until the steel casing (6) is stably immersed in the mud , the piling boat (18) is decoupled. 4. according to the construction method of the complex stratum super long diameter pile foundation casing structure according to claim 3, it is characterized in that, step S4 is specifically: piling ship (18) hoists steel truss (24), and steel truss (24) Install on the top of the completed starting work platform (4) or the steel casing (6); set the cantilever casing guide platform (26) at the front end of the steel truss (24); lay the casing on the surface of the steel truss (24) Area working platform (5) surface layer. 5. according to the construction method of the complex stratum super long diameter pile foundation casing structure according to claim 4, it is characterized in that, step S5 is specifically: lift the steel casing (6) with the piling ship (18), adjust the steel casing The plane position and verticality of the cylinder (6) until it reaches the set plane position and verticality; the piling boat (18) is hooked, and the steel casing (6) goes down to the river along the point-contact guide frame (1) of the steel casing bottom and insert into the soil, and the piling boat (18) is unhooked. 6. according to the construction method of the complex stratum super long diameter pile foundation casing structure according to claim 5, it is characterized in that, step S6 is specifically: after the steel casing (6) sinking is completed, suspend the vibrating hammer (19) , remove the connection between the point-contact guide frame (1) of the steel casing and the anchor beam (15); move the point-contact guide frame (1) of the steel casing to another steel casing for positioning, repeat step S5, go down The steel protective tube (6) is submerged, and the point-contact guide frame (1) of the steel protective tube is connected with the starting working platform (4) and the adjacent steel protective tube (6). 7. according to the construction method of the complex formation super long diameter pile foundation casing structure of claim 6, it is characterized in that, step S7 is specifically: measure the position of the first row of steel casing (6), butt welding on the steel casing The corbel (7) on the barrel (6) is leveled; the supporting beam (13), the secondary beam (14) and the anchor beam (15) are placed on the first row of the steel casing (6), and are connected with the steel casing. Weld the corbels (7) on the (6), hoist and anchor the steel casing point-contact guide frame (1) on the front and rear anchor beams (15); repeat the above steps until all the steel casings (6) are sunk. . 8 . The super-long-diameter pile foundation casing structure in complex strata, characterized in that it is obtained by the method of any one of claims 1 to 7 .

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