Double-row steel pipe pile steel trestle in boulder stratum and construction method

Abstract

The invention relates to a double-row steel pipe pile steel trestle for a boulder stratum and a construction method. The construction method comprises the following steps: constructing steel pipe piles on a land complex boulder pavement, and constructing a steel trestle at the tops of the steel pipe piles; a transverse cantilever construction platform is erected at the cantilever end of the bailey beam through the erected steel trestle, steel pipe piles are inserted and driven through the cantilever construction platform, and then the steel trestle above the common water area is constructed; and the steel trestle above the deepwater area is constructed. The method has the beneficial effects that the technology that the stool piles of the steel trestle are firstly excavated on the land complex boulder road surface is adopted, the stability and the bearing capacity of the steel trestle are remarkably improved, the difficulty of driving the steel pipe piles is reduced, and the distance and the depth of the piles can be flexibly adjusted according to geological conditions and engineering requirements so as to adapt to different construction environments; and after the percussion drill leads the hole to the specified depth, the steel pipe pile is inserted and driven to the specified depth by adopting the vibratory hammer, so that the engineering cost is effectively saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and particularly relates to a double-row steel pipe pile steel trestle in boulder stratum and a construction method thereof. Background Technique

[0002] In the foundation construction of bridge engineering, various complex geological conditions are often encountered. The boulder stratum is one of the more intractable geological conditions, which has non-uniformity and uncertainty, bringing great challenges to construction. In such a stratum for foundation construction, a stable and reliable construction passage is required to ensure the safe passage of personnel and machinery. The double-row steel pipe pile steel trestle in boulder stratum and the construction method thereof are to meet the engineering requirements under complex geological conditions such as the boulder stratum.

[0003] In addition, choosing a reasonable trestle scheme can not only minimize costs to the greatest extent, but also ensure construction safety. In the boulder stratum, traditional construction methods may require a large amount of foundation treatment and reinforcement work, which will not only increase construction costs but also extend the construction period. Therefore, there is an urgent need for a new steel trestle and construction method to improve construction efficiency and reduce construction costs. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a double-row steel pipe pile steel trestle in boulder stratum and a construction method thereof.

[0005] The construction method of this double-row steel pipe pile steel trestle in boulder stratum includes the following steps:

[0006] Step 1: Construct steel pipe piles on the complex boulder pavement on land, and construct a steel trestle at the top of the steel pipe piles.

[0007] Step 2: Use the already erected steel trestle to erect a transverse cantilever construction platform at the cantilever end of the Bailey beam, insert steel pipe piles through the cantilever construction platform, and then construct the steel trestle above the ordinary water area.

[0008] Step 3: Construct the steel trestle above the deep water area:

[0009] For the geological condition without overburden layer, the steel pipe piles are positioned and settled through the guide frame reserved by the cantilever construction platform. Ring-shaped sandbags are thrown around the steel pipe piles, and underwater non-segregating concrete is poured into the steel pipe piles to form a whole with the ring-shaped sandbags around the piles; a steel trestle is constructed at the top of the steel pipe piles.

[0010] For large boulders with overburden layer, install guide steel pipes through the cantilever construction platform, penetrate the large boulders through the positioning guide steel pipes and construct anchor piles, carry out pilot hole construction and jacking of steel pipe piles, and construct a steel trestle at the top of the steel pipe piles.

[0011] Preferably, in step one, for the complex boulder pavement on land, first excavate the boulder pavement, then drive steel pipe piles. After the steel pipe piles are driven to the predetermined position, weld horizontal braces and cross braces to reinforce the steel pipe piles and form bench piles. A limiting channel steel is provided at the top of the steel pipe piles, and a transverse load-bearing beam is installed in the limiting channel steel at the top of the steel pipe piles, and then a steel trestle is constructed.

[0012] Preferably, in step two, use the already built steel trestle to build a transverse cantilever construction platform perpendicular to the steel trestle at the cantilever end of the Bailey beam where the precast bridge deck has not been hoisted. A reserved guiding frame for the cantilever construction platform is provided on the cantilever construction platform, and a guardrail for the cantilever construction platform is installed around the cantilever construction platform. Initially, drive the steel pipe piles in place by a vibrating hammer, and then use a crawler crane to hoist the impact drill to the cantilever construction platform. Conduct pilot hole construction for the steel pipe piles through the impact drill. After the pilot hole drilled by the impact drill reaches the specified depth, then use the vibrating hammer to drive the steel pipe piles to the specified depth. After the steel pipe piles are driven to the predetermined position, weld horizontal braces and cross braces to reinforce the steel pipe piles and form bench piles. Then install a transverse load-bearing beam in the limiting channel steel at the top of the steel pipe piles, and then construct a steel trestle.

[0013] Preferably, in step three, for the geological condition of no overburden layer in deep water areas, position the steel pipe piles through the reserved guiding frame of the cantilever construction platform to allow each steel pipe pile to freely settle. When the steel pipe piles sink to the bottom of the water and stop moving, conduct verticality positioning. Throw annular sandbags around the pile body of the steel pipe piles, and then weld horizontal braces and cross braces for reinforcement. Pour underwater non-segregation concrete into the steel pipe piles. The underwater non-segregation concrete flows out from the bottom pipe orifice of the steel pipe piles and forms a whole with the annular sandbags around the piles. After reaching the predetermined strength, install a transverse load-bearing beam in the limiting channel steel at the top of the steel pipe piles, and then construct a steel trestle.

[0014] Preferably, in step three, for the construction of the steel trestle in deep water areas with large boulders and overburden layer: for the geological condition of large boulders with overburden layer in deep water areas, use a crawler crane to hoist the engineering drill to the cantilever construction platform, and then install a guiding steel pipe to determine the drilling position of the anchoring holes. The engineering drill drills anchoring holes in the large boulders through the positioning guiding steel pipe. The depth of the anchoring holes exceeds the bottom elevation of the large boulders. Hoist the anchoring steel reinforcement cage in the anchoring holes, and then pour anchoring concrete to form anchoring piles to stabilize the large boulders. Then use a crawler crane to hoist the impact drill to the cantilever construction platform. Conduct pilot hole construction for the steel pipe piles through the impact drill. After the pilot hole drilled by the impact drill reaches the specified depth, then use the vibrating hammer to drive the steel pipe piles to the specified depth. After the steel pipe piles are driven to the predetermined position, weld horizontal braces and cross braces to reinforce the steel pipe piles and form bench piles. Then install a transverse load-bearing beam in the limiting channel steel at the top of the steel pipe piles. Hoist Bailey beams on the transverse load-bearing beam, connect the Bailey beams with strengthening vertical rods, hoist precast bridge decks on the Bailey beams, install kick plate patterns on both sides of the precast bridge decks, and install protective railings.

[0015] Preferably, the steel trestle includes a transverse load-bearing beam, on which a Bailey beam is suspended, the Bailey beams are connected by reinforcing vertical rods, prefabricated bridge panels are suspended on the Bailey beams, skirting patterned plates are installed on both sides of the prefabricated bridge panels, and protective railings are additionally installed.

[0016] The double-row steel pipe pile steel trestle in the solitary rock formation is obtained by any of the above-mentioned methods.

[0017] The beneficial effects of the present invention are:

[0018] 1) The present invention adopts the technology of first excavating steel trestle bench piles on complex boulder pavement on land, which significantly improves the stability and bearing capacity of the steel trestle, reduces the difficulty of driving steel pipe piles, and can flexibly adjust the spacing and depth of the piles according to geological conditions and engineering requirements to adapt to different construction environments.

[0019] 2) The present invention adopts the cantilever impact hole-drilling technology to pass through the isolated rock. A cantilever construction platform reserved guide frame is arranged on the cantilever construction platform. The steel pipe pile hole-drilling construction is carried out by an impact drill. After the impact drill drills the hole to the specified depth, a vibrating hammer is used to drive the steel pipe pile to the specified depth, which effectively saves engineering costs.

[0020] 3) The present invention adopts the technology of pouring concrete into steel pipe piles with annular sandbags around the piles in deep water areas for the construction of steel trestle without covering layer. Annular sandbags are thrown around the pile body, and underwater non-separated concrete is poured from the pile. The concrete flows out from the pipe mouth and forms a whole with the sandbags around the pile.

[0021] 4) The present invention adopts the technology of stabilizing isolated rocks by using the guided steel pipe drilling anchor piles. Through the precise positioning of the guided steel pipe, the borehole diameter and position are effectively controlled, and the construction efficiency and quality are improved. The grouting anchor pile technology is used to greatly improve the stability of isolated rocks during the steel pipe pile construction, and the construction quality of the steel trestle is effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the steel trestle bench pile structure for the first excavation of the complex rock pavement on land;

[0023] Figure 2 It is a schematic diagram of the structure of steel trestle bench piles in deep water areas with annular sandbags around the piles and concrete poured into the steel pipe piles;

[0024] Figure 3 This is a large-scale drawing of the structure of annular sandbag steel pipe piles filled with concrete;

[0025] Figure 4 It is the detailed drawing of the guide steel pipe drilling structure;

[0026] Figure 5 It is the detailed drawing of the stable structure of the guide steel pipe bored anchor pile and the solitary rock;

[0027] Figure 6 It is a schematic diagram of the structure for stabilizing boulders in the drilled and anchored piles of the guiding steel pipes.

[0028] Description of the reference numerals: 1 - Complex boulder pavement, 2 - Excavated boulder pavement, 3 - Steel pipe pile, 4 - Horizontal bracing, 5 - X-brace, 6 - Limiting channel steel, 7 - Transverse load-bearing beam, 8 - Bailey beam, 9 - Reinforcing vertical bar, 10 - Prefabricated bridge deck, 11 - Kick plate with pattern, 12 - Guardrail, 13 - Cantilever end of the Bailey beam, 14 - Cantilever construction platform, 15 - Reserved guiding frame of the cantilever construction platform, 16 - Guardrail of the cantilever construction platform, 17 - Vibrohammer, 18 - Ring-shaped sandbag, 19 - Underwater non-segregating concrete, 20 - Overburden layer, 21 - Large boulder, 22 - Anchor pile, 23 - Anchor reinforcement cage, 24 - Anchor concrete, 25 - Deep water area, 26 - Guiding steel pipe, 27 - Anchor hole, 28 - Engineering drill. Specific implementation mode

[0029] The present invention will be further described below in conjunction with the embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be pointed out that for those of ordinary skill in the technical field, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0030] Embodiment 1

[0031] As an embodiment, as Figures 1 to 6 shown, the construction method of the double-row steel pipe pile steel trestle in the boulder formation includes the following steps:

[0032] Step 1: Construct the steel pipe pile 3 on the complex boulder pavement 1 on land, and construct the steel trestle at the top of the steel pipe pile 3;

[0033] Step 2: Use the already built steel trestle to build the transverse cantilever construction platform 14 at the cantilever end 13 of the Bailey beam, insert the steel pipe pile 3 through the cantilever construction platform 14, and then construct the steel trestle above the ordinary water area;

[0034] Step 3: Construct the steel trestle above the deep water area 25:

[0035] For the geological formation without overburden layer, the steel pipe pile 3 is positioned and settled through the reserved guiding frame 15 of the cantilever construction platform. Throw the ring-shaped sandbag 18 around the steel pipe pile 3, and pour the underwater non-segregating concrete 19 from the steel pipe pile 3 to form a whole with the ring-shaped sandbag 18 around the pile; construct the steel trestle at the top of the steel pipe pile 3;

[0036] For the geological formation with large boulders 21 and overburden layer 20, install the guiding steel pipe 26 through the cantilever construction platform 14, penetrate the large boulder 21 through the positioning guiding steel pipe 26 and construct the anchor pile 22, carry out the pilot hole construction and insertion of the steel pipe pile 3, and construct the steel trestle at the top of the steel pipe pile 3.

[0037] Example 2

[0038] As another embodiment, this Example 2 is proposed based on Example 1, and a more specific construction method for a double-row steel pipe pile steel trestle in boulder stratum is as follows:

[0039] Step 1: Construction of the steel trestle on the complex boulder pavement 1 on land: For the complex boulder pavement 1 on land, first excavate the boulder pavement 2, and then drive the steel pipe piles 3. After the steel pipe piles 3 are driven to the predetermined position, weld the horizontal bracing 4 and the cross bracing 5 to reinforce the steel pipe piles 3 to form a bench pile. Then, install the transverse load-bearing beam 7 in the top limiting channel steel 6 of the steel pipe piles 3, hoist the Bailey beam 8 on the transverse load-bearing beam 7, connect the Bailey beams 8 through the strengthening vertical rods 9, hoist the precast bridge deck 10 on the Bailey beams 8, install the kick plate with pattern 11 on both sides of the precast bridge deck 10, and install the protective railing 12.

[0040] Step 2: Construction of the steel trestle in the ordinary water area: Use the already built steel trestle to build a transverse cantilever construction platform 14 perpendicular to the steel trestle at the cantilever end 13 of the Bailey beam where the precast bridge deck 10 has not been hoisted. There is a reserved guiding frame 15 for the cantilever construction platform on the cantilever construction platform 14, and the cantilever construction platform guardrail 16 is installed around the cantilever construction platform 14. Initially, drive and fix the steel pipe piles 3 with a vibrating hammer 17, and then use a crawler crane to hoist the impact drill to the cantilever construction platform 14. Conduct the pilot hole construction of the steel pipe piles 3 with the impact drill. After the pilot hole of the impact drill reaches the specified depth, then use the vibrating hammer 17 to drive the steel pipe piles 3 to the specified depth. After the steel pipe piles 3 are driven to the predetermined position, weld the horizontal bracing 4 and the cross bracing 5 to reinforce the steel pipe piles 3 to form a bench pile. Then, install the transverse load-bearing beam 7 in the top limiting channel steel 6 of the steel pipe piles 3, hoist the Bailey beam 8 on the transverse load-bearing beam 7, connect the Bailey beams 8 through the strengthening vertical rods 9, hoist the precast bridge deck 10 on the Bailey beams 8, install the kick plate with pattern 11 on both sides of the precast bridge deck 10, and install the protective railing 12.

[0041] It should be noted that the same or similar parts in this Example are mutually referable to those in Example 1 and will not be elaborated in this application.

[0042] Example 3

[0043] As another embodiment, this Example 3 is proposed based on Examples 1 and 2, and a more specific construction method for a double-row steel pipe pile steel trestle in boulder stratum. Specifically, Step 3 is as follows:

[0044] Steel trestle construction in deep water area without overburden layer: For the geological condition of no overburden layer in the deep water area of 25, the steel pipe piles 3 are accurately positioned through the guide frame 15 reserved on the cantilever construction platform, so that each steel pipe pile 3 can freely settle. After the steel pipe pile 3 sinks to the bottom and stops moving, the verticality is positioned. Ring sand bags 18 are thrown around the pile body, and then the horizontal bracing 4 and the cross bracing 5 are welded for reinforcement. The underwater non-segregation concrete 19 is poured into the steel pipe pile 3. The underwater non-segregation concrete 19 flows out from the bottom pipe orifice of the steel pipe pile 3 and forms a whole with the ring sand bags 18 around the pile. After reaching the predetermined strength, the transverse load-bearing beam 7 is installed in the top limit channel steel 6 of the steel pipe pile 3. The Bailey beam 8 is hoisted on the transverse load-bearing beam 7. The Bailey beams 8 are connected by the strengthening vertical rods 9. The precast bridge deck 10 is hoisted on the Bailey beams 8. The kick plate with pattern is installed on both sides of the precast bridge deck 10, and the protective railing 12 is additionally installed.

[0045] Steel trestle construction in deep water area with large boulders 21 and overburden layer 20: For the geological condition of large boulders 21 and overburden layer 20 in the deep water area of 25, the crawler crane is used to lift the engineering drill to the cantilever construction platform 14, and then the guide steel pipe 26 is installed to determine the drilling position of the anchor hole 27. The engineering drill 28 drills 2 - 3 anchor holes 27 on the large boulder 21 through the positioning guide steel pipe 26. The depth of the anchor hole 27 exceeds the bottom elevation of the large boulder 21. The anchor reinforcement cage 23 is hoisted into the anchor hole 27, and then the anchor concrete 24 is poured to form the anchor pile 22 to stabilize the large boulder 21. Then the crawler crane is used to lift the impact drill to the cantilever construction platform 14, and the steel pipe pile 3 is pre-drilled by the impact drill. After the impact drill pre-drills to the specified depth, the steel pipe pile 3 is inserted and driven to the specified depth by the vibrating hammer 17. After the steel pipe pile 3 is driven to the predetermined position, the horizontal bracing 4 and the cross bracing 5 are welded for the reinforcement of the steel pipe pile 3 to form a bench pile. Then the transverse load-bearing beam 7 is installed in the top limit channel steel 6 of the steel pipe pile 3. The Bailey beam 8 is hoisted on the transverse load-bearing beam 7. The Bailey beams 8 are connected by the strengthening vertical rods 9. The precast bridge deck 10 is hoisted on the Bailey beams 8. The kick plate with pattern is installed on both sides of the precast bridge deck 10, and the protective railing 12 is additionally installed.

[0046] It should be noted that the same or similar parts in this embodiment and Embodiments 1 and 2 can be referred to each other and will not be elaborated in this application.

[0047] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

Claims

1. A construction method for a double-row steel pipe pile steel trestle in a solitary rock formation, characterized in that: The following steps are involved: Step 1: construct steel pipe piles on the complex rocky road surface on land, and construct a steel trestle on the top of the steel pipe piles; Step 2: Use the built steel trestle to build a transverse cantilever construction platform on the cantilever end of the Bailey beam, insert steel pipe piles through the cantilever construction platform, and then construct the steel trestle above the ordinary waters; Step 3: Construction of the steel trestle above the deep water area: For geology without covering layer, steel pipe piles are positioned and settled through the reserved guide frame of the cantilever construction platform, and circular sand bags are thrown around the steel pipe piles. Underwater non-separated concrete is poured from the steel pipe piles to form a whole with the circular sand bags around the piles; a steel trestle is constructed on the top of the steel pipe piles; For large boulders with covering layers, guide steel pipes are installed through a cantilever construction platform. The guide steel pipes are positioned to penetrate the large boulders and construct anchor piles. The steel pipe piles are bored and driven in, and a steel trestle is constructed on top of the steel pipe piles.

2. The construction method of the double-row steel pipe pile steel trestle in the boulder stratum according to claim 1 is characterized in that: In step one, for complex boulder roads on land, the boulder road surface is excavated first, and then steel pipe piles are driven. After the steel pipe piles are driven to the predetermined positions, flat joints and scissors braces are welded to reinforce the steel pipe piles to form bench piles; a limiting channel steel is provided on the top of the steel pipe pile, and a transverse load-bearing beam is installed in the limiting channel steel on the top of the steel pipe pile, and a steel trestle is constructed.

3. The construction method of double-row steel pipe pile steel trestle in boulder stratum according to claim 1 is characterized in that: In step two, a transverse cantilever construction platform perpendicular to the steel trestle is constructed using the already constructed steel trestle on the cantilever end of the Bailey beam where the prefabricated bridge deck has not yet been hoisted. A cantilever construction platform reserved guide frame is provided on the cantilever construction platform, and a cantilever construction platform guardrail is installed around the cantilever construction platform. The steel pipe piles are initially driven and fixed by a vibrating hammer, and then the impact drill is hoisted to the cantilever construction platform by a crawler crane, and the steel pipe pile boring is carried out by the impact drill. After the impact drill boring is carried out to the specified depth, the steel pipe pile is driven to the specified depth by a vibrating hammer. After the steel pipe pile is driven to the predetermined position, the flat joint and scissors brace are welded to reinforce the steel pipe pile to form a bench pile, and then the transverse load-bearing beam is installed in the limiting channel steel on the top of the steel pipe pile, and the steel trestle is constructed.

4. The construction method of double-row steel pipe pile steel trestle in boulder stratum according to claim 1 is characterized in that: In step three, in view of the geology without covering layer in deep water area, the steel pipe piles are positioned by the guide frame reserved on the cantilever construction platform, so that each steel pipe pile can settle freely. When the steel pipe pile sinks to the bottom of the water and remains motionless, it is positioned vertically, and circular sand bags are thrown around the pile body of the steel pipe pile. Then, flat joints and scissors struts are welded for reinforcement, and underwater non-separating concrete is poured from the steel pipe pile. The underwater non-separating concrete flows outward from the bottom pipe mouth of the steel pipe pile and forms a whole with the circular sand bags around the pile. After reaching the predetermined strength, the transverse load-bearing beam is installed in the limiting channel steel at the top of the steel pipe pile, and the steel trestle is constructed.

5. The construction method of double-row steel pipe pile steel trestle in boulder stratum according to claim 1 is characterized in that: In step three, the construction of steel trestle with large boulders and covering layers in deep water areas: for large boulders and covering layers in deep water areas, the engineering drill is hoisted to the cantilever construction platform by using a crawler crane, and then the guide steel pipe is installed to determine the drilling position of the anchor hole. The engineering drill drill drills the anchor hole on the large boulder by positioning the guide steel pipe. The depth of the anchor hole exceeds the bottom elevation of the large boulder. The anchor steel cage is hoisted in the anchor hole, and then the anchor concrete is poured to form an anchor pile to stabilize the large boulder. Then the impact drill is hoisted to the On the cantilever construction platform, steel pipe pile holes are constructed by impact drilling. After the impact drill drills the holes to the specified depth, a vibratory hammer is used to drive the steel pipe piles to the specified depth. After the steel pipe piles are driven to the predetermined position, flat joints and scissors struts are welded to reinforce the steel pipe piles to form bench piles. Then, transverse load-bearing beams are installed in the limiting channel steel on the top of the steel pipe piles. Bailey beams are hoisted on the transverse load-bearing beams. The Bailey beams are connected by reinforcing vertical rods. Prefabricated bridge panels are hoisted on the Bailey beams, and skirting patterned plates are installed on both sides of the prefabricated bridge panels, and protective railings are added.

6. The construction method of double-row steel pipe pile steel trestle in boulder stratum according to claim 1 is characterized in that: The steel trestle includes a transverse load-bearing beam, on which a Bailey beam is suspended. The Bailey beams are connected by reinforcing vertical rods. Prefabricated bridge panels are suspended on the Bailey beams, and skirting patterned plates are installed on both sides of the prefabricated bridge panels, and protective railings are added.

7. Double-row steel pipe pile steel trestle in isolated rock formation, characterized in that: Obtained by the method according to any one of claims 1 to 6.

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