阅读说明：本技术 复杂场地大型矩形桩预拼箍筋施工方法 (Construction method for pre-splicing stirrups of large rectangular piles in complex site ) 是由 余永明 于 2020-05-29 设计创作，主要内容包括：本发明公开了复杂场地大型矩形桩预拼箍筋施工方法,涉及箍筋施工领域,为达到上述目的,本发明的技术方案包括如下步骤：1)测量放线、定桩位；2)施工锁口；3)桩孔开挖及支护；4)嵌岩段桩孔开挖；5)持力层检测及桩孔验收；6)制作预拼箍筋的辅助筋；7)预拼箍筋、边拼边下放；8)主筋吊装、定位绑扎；9)安装超声波声检测管；10)桩芯砼灌注。钢筋笼的主、箍筋可实现工厂加工预拼箍筋配送,箍筋为整片焊接箍拼装,现场在孔口绑扎箍筋笼,不受主筋影响,拼装速度快。(The invention discloses a construction method of a pre-spliced stirrup of a large rectangular pile in a complex site, which relates to the field of stirrup construction, and in order to achieve the purpose, the technical scheme of the invention comprises the following steps: 1) measuring the paying-off and pile fixing positions; 2) constructing a locking notch; 3) excavating and supporting pile holes; 4) excavating pile holes of the rock-socketed section; 5) detecting a bearing layer and checking and accepting pile holes; 6) manufacturing auxiliary bars of the pre-spliced stirrups; 7) pre-splicing stirrups, and putting down while splicing; 8) hoisting and positioning binding main bars; 9) installing an ultrasonic sound detection tube; 10) pouring concrete into the pile core. The stirrup can be assembled for the whole welding hoop, and the stirrup is assembled on the spot in the orifice binding stirrup cage without being influenced by the main reinforcement, so that the assembling speed is high.)

1. The construction method of the pre-spliced stirrup of the large rectangular pile in the complex site is characterized by comprising the following steps of:

1) measuring the paying-off and pile fixing positions;

2) constructing a locking notch;

3) excavating and supporting pile holes;

4) excavating pile holes of the rock-socketed section;

5) detecting a bearing layer and checking and accepting pile holes;

6) manufacturing auxiliary bars of the pre-spliced stirrups;

7) pre-splicing stirrups, and putting down while splicing;

8) hoisting and positioning binding main bars;

9) installing an ultrasonic sound detection tube;

10) pouring concrete into the pile core.

2. The construction method of the pre-spliced stirrup of the large rectangular pile in the complex site according to claim 1, characterized by comprising the following steps: the construction locking notch: according to the positioning and paying-off, a locking opening and a pile hole connected with the locking opening are excavated; after the first pile hole is formed, binding a protective wall and a locking steel bar, and pouring locking and protective wall concrete by a formwork; and after the fore shaft concrete is poured for 2 days, the template is removed, and the pile position control line is guided and marked on the fore shaft retaining wall.

3. The construction method of the pre-spliced stirrup of the large rectangular pile in the complex site according to claim 1, characterized by comprising the following steps: pile hole excavation and supporting: erecting a vertical transportation bracket at the upper opening of the pile hole, and continuously and circularly excavating and supporting the next pile hole; the excavation of the pile hole of the soil layer section is carried out layer by layer from top to bottom, the middle part of the pile core is excavated firstly, then the pile core is expanded to the periphery, the section size of the excavated hole is controlled, when the excavation depth exceeds 5m, an air blower is used for supplying air to the underground, and the air volume is more than 25L/S.

4. The construction method of the pre-spliced stirrup of the large rectangular pile in the complex site according to claim 1, characterized by comprising the following steps: excavating pile holes of the rock-socketed section: and drilling holes along the periphery of the hole wall by adopting a water drill, and then crushing the middle core and then discharging slag.

5. The construction method of the pre-spliced stirrup of the large rectangular pile in the complex site according to claim 1, characterized by comprising the following steps: manufacturing auxiliary bars of the pre-spliced stirrup: the pre-spliced hooping of each pile reinforcement cage is made of 4 phi 14HRB400 steel bars, the steel bars are lengthened by adopting straight threaded joints, the upper ends of the auxiliary bars are bent to form rings, protective layer earrings are welded on the auxiliary bars at intervals of 1m, the earrings adopt phi 12HPB 300-grade steel bars which are not subjected to cold drawing, the auxiliary bars are not more than 9m sections, the straight threaded joints are lengthened, a starting hoop is bound or spot-welded at the bottom of the lowest section after the first section of 4 auxiliary bars are hoisted, and the positions of the auxiliary bars are fixed.

6. The construction method of the pre-spliced stirrup of the large rectangular pile in the complex site according to claim 1, characterized by comprising the following steps: pre-splicing stirrups, splicing while lowering: when assembling first piece stirrup, through the ligature setpoint of spirit level location four corners, ensure on same horizontal plane, follow first piece stirrup as the benchmark afterwards, draw the stirrup horizontal setpoint in 1.5 meters height range, ligature the stirrup of 0.6m and 1.0m high position earlier, then according to design stirrup interval ligature in proper order.

7. The construction method of the pre-spliced stirrup of the large rectangular pile in the complex site according to claim 1, characterized by comprising the following steps: pre-splicing stirrups, splicing while lowering: every 1m of height is assembled, the height is reduced by 1m, meanwhile, the steel reinforcement cage anti-falling safety device is moved to the position of the upper 1m of ear ring to temporarily fix the pre-assembled stirrup framework, after one section of the cage is pre-assembled by 9m, the pre-assembled stirrup cage is temporarily fixed at an orifice, the sleeve lifting ring is taken down, the next section of 4 auxiliary reinforcements is lifted, the positive and negative wire sleeve is connected with the auxiliary reinforcements of the orifice stirrup cage, and then the stirrup assembly is repeated.

8. The construction method of the pre-spliced stirrup of the large rectangular pile in the complex site according to claim 1, characterized by comprising the following steps: the main reinforcement binding general sequence is as follows: drawing main rib positioning lines, hoisting and binding four-corner main ribs, positioning, hoisting and binding the other main ribs, and positioning; the main reinforcement in the same stirrup sash is sequentially hoisted into the holes, the concrete cushion block is arranged at the bottom, then the upper, middle and lower workers respectively bind 3 binding wires for fixation, and finally bind the rest binding points from bottom to top.

Technical Field

The invention relates to a construction method for pre-splicing stirrups of large rectangular piles in a complex site, and mainly relates to the field of stirrup construction.

Background

With the enlargement of the scale of the basic construction of China, particularly the massive construction of roads and railways, the landslide control along the line becomes an inevitable thing. For the mountain city in Chongqing, in the construction process of slope land and Binjiang buildings, the cutting and the supporting of the side slope are also often required. The large rectangular pile has a large horizontal bending resistance, and is widely used for retaining soil and supporting on a side slope or landslide resistance treatment. Because of the side slope or the landslide zone, the construction site is complex, is mostly in a steep slope shape, and has narrow roads and no large-scale machine tool entering conditions. The large rectangular pile reinforcement cage has the characteristics of dense main reinforcements in the bending resistance direction, large space between the main reinforcements on two sides, large overall dimension of stirrups, poor stability and the like, the problems of low work efficiency, poor safety, easy collapse in the reinforcement cage binding process and the like exist in conventional reinforcement installation due to the fact that the conventional reinforcements are mostly bound in holes, and the construction of the reinforcement cage of the large rectangular pile in a complex site is a ubiquitous problem.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the construction method of the pre-spliced stirrups of the large rectangular pile in the complex field, the main stirrups and the stirrups of the reinforcement cage can realize the distribution of the pre-spliced stirrups processed in a factory, the stirrups are spliced by integrally welding hoops, the reinforcement cage is bound at an orifice on the spot, the influence of the main stirrups is avoided, and the splicing speed is high.

In order to achieve the purpose, the technical scheme of the invention is as follows: the method comprises the following steps: 1) measuring the paying-off and pile fixing positions; 2) constructing a locking notch; 3) excavating and supporting pile holes; 4) excavating pile holes of the rock-socketed section; 5) detecting a bearing layer and checking and accepting pile holes; 6) manufacturing auxiliary bars of the pre-spliced stirrups; 7) pre-splicing stirrups, and putting down while splicing; 8) hoisting and positioning binding main bars; 9) installing an ultrasonic sound detection tube; 10) pouring concrete into the pile core.

Preferably, the construction locking notch: according to the positioning and paying-off, a locking opening and a pile hole connected with the locking opening are excavated; after the first pile hole is formed, binding a protective wall and a locking steel bar, and pouring locking and protective wall concrete by a formwork; and after the fore shaft concrete is poured for 2 days, the template is removed, and the pile position control line is guided and marked on the fore shaft retaining wall.

Preferably, pile hole excavation and support: erecting a vertical transportation bracket at the upper opening of the pile hole, and continuously and circularly excavating and supporting the next pile hole; the excavation of the pile hole of the soil layer section is carried out layer by layer from top to bottom, the middle part of the pile core is excavated firstly, then the pile core is expanded to the periphery, the section size of the excavated hole is controlled, when the excavation depth exceeds 5m, an air blower is used for supplying air to the underground, and the air volume is more than 25L/S.

Preferably, excavating the pile hole of the rock-socketed section: and drilling holes along the periphery of the hole wall by adopting a water drill, and then crushing the middle core and then discharging slag.

Preferably, the auxiliary bar of the pre-spliced stirrup is manufactured: the pre-spliced hooping of each pile reinforcement cage is made of 4 phi 14HRB400 steel bars, the steel bars are lengthened by adopting straight threaded joints, the upper ends of the auxiliary bars are bent to form rings, protective layer earrings are welded on the auxiliary bars at intervals of 1m, the earrings adopt phi 12HPB 300-grade steel bars which are not subjected to cold drawing, the auxiliary bars are not more than 9m sections, the straight threaded joints are lengthened, a starting hoop is bound or spot-welded at the bottom of the lowest section after the first section of 4 auxiliary bars are hoisted, and the positions of the auxiliary bars are fixed.

Preferably, piece together stirrup in advance, put while piecing together: when assembling first piece stirrup, through the ligature setpoint of spirit level location four corners, ensure on same horizontal plane, follow first piece stirrup as the benchmark afterwards, draw the stirrup horizontal setpoint in 1.5 meters height range, ligature the stirrup of 0.6m and 1.0m high position earlier, then according to design stirrup interval ligature in proper order.

Preferably, piece together stirrup in advance, put while piecing together: every 1m of height is assembled, the height is reduced by 1m, meanwhile, the steel reinforcement cage anti-falling safety device is moved to the position of the upper 1m of ear ring to temporarily fix the pre-assembled stirrup framework, after one section of the cage is pre-assembled by 9m, the pre-assembled stirrup cage is temporarily fixed at an orifice, the sleeve lifting ring is taken down, the next section of 4 auxiliary reinforcements is lifted, the positive and negative wire sleeve is connected with the auxiliary reinforcements of the orifice stirrup cage, and then the stirrup assembly is repeated.

Preferably, the main bar binding general sequence is as follows: drawing main rib positioning lines, hoisting and binding four-corner main ribs, positioning, hoisting and binding the other main ribs, and positioning; the main reinforcement in the same stirrup sash is sequentially hoisted into the holes, the concrete cushion block is arranged at the bottom, then the upper, middle and lower workers respectively bind 3 binding wires for fixation, and finally bind the rest binding points from bottom to top.

The technical principle and the beneficial effects of the invention are as follows:

the work efficiency is high: the stirrup can be assembled for the whole welding hoop, and the stirrup is assembled on the spot in the orifice binding stirrup cage without being influenced by the main reinforcement, so that the assembling speed is high. Through on-site measurement, 2 long reinforcement cages of 20m can be finished by one team every day, and at most 1 long reinforcement cage can be finished by one team in a traditional hole binding mode every day, so that the manufacturing and mounting speed is greatly improved.

The quality is good: it can be used for treating common diseases. Because the pre-assembled stirrups are vertically bound under the action of the gravity of the orifice, the formed reinforcement cage cannot be bent and deformed, main reinforcements bound by post-installation are accurately positioned, and are connected by mechanical straight threads, so that the connection quality is reliable. The problems of common quality problems of deformation of a reinforcement cage, poor welding connection quality of a subsection orifice and the like in the traditional subsection hoisting are solved.

And (4) construction safety: compared with traditional in-hole binding, the technology of pre-splicing the stirrups reduces the workload of in-hole operation in the process of binding the stirrups at the hole opening, improves the operation environment and improves the construction efficiency and the safety. Compared with the sectional mounting process, the technical scheme reduces the hoisting load, avoids the welding and lengthening difficulty of the main reinforcement and improves the construction safety.

The cost is reduced: this technical scheme has reduced the input in reinforcing bar processing place, improves the work efficiency through piecing together stirrup technique in advance, has reduced the labour cost, through the hoist and mount load that reduces the steel reinforcement cage, has reduced the lease expense of hoisting equipment, has reduced the construction requirement on site road and place to greatly reduced construction cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only two of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic illustration of a construction flow according to an embodiment of the present invention;

FIG. 2 is a flow chart of a construction process according to an embodiment of the present invention;

FIG. 3 is a schematic view of a pay-off positioning in accordance with an embodiment of the present invention;

fig. 4 is a schematic view of an earring according to an embodiment of the present invention.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are merely preferred embodiments of the present invention, rather than all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.