CN216380270U - Prefabricated conical head piece - Google Patents

Abstract

The utility model discloses a prefabricated cone head piece, wherein the prefabricated cone head piece (3) is arranged in a reinforcement cage of a detachable steel strand main reinforcement; the steel reinforcement cage also comprises a steel strand main reinforcement (1) and a supporting structural member (2); the prefabricated cone head piece (3) is arranged at the bottom of the reinforcement cage, is supported by the bottom of the support structural piece (2) when the reinforcement cage is lowered into a pile hole and is inserted into the bottom end (13) of the pile hole; the prefabricated cone piece (3) comprises an upper circular ring piece (91) in contact with the bottom of the supporting structural piece (2) and a lower cone piece (92) positioned below the upper circular ring piece (91).

Description

Prefabricated conical head piece

Technical Field

Embodiments of the present disclosure relate generally to the field of green energy efficient building construction, and more particularly, to a prefabricated cone piece.

Background

In recent years, with the continuous development of urban construction and the large-scale development of underground spaces, pile anchoring technology in foundation pits is widely applied, the most common technology in a building envelope system is cast-in-place pile technology, and cast-in-place piles are used as temporary retaining wall structures of foundation pits, and the effect of the cast-in-place piles is finished after foundation construction is finished. At this time, a large amount of reinforcing steel bars buried underground cannot be recycled and discarded underground, which causes environmental pollution, water and soil pollution, metal loss and the like, resulting in resource waste and economic loss.

For this reason, recoverable steel reinforcement cage has appeared on the market now, but this kind of recoverable steel reinforcement cage technique has following defect: first, the recoverable reinforcement cage technology generally requires that the reinforcement is sleeved in a sleeve (for example, a PVC pipe) by means of the sleeve, so that the reinforcement is drawn out of the sleeve by means of rotation when the reinforcement is required to be recovered, thereby recovering the reinforcement. However, the number of the steel bars used by the steel bar cage in the recycling mode is large, the cost is high, the recycling mode is not economical, and the problem of resource waste is caused. And because the deformation of the reinforcement cage, the reinforcing steel bars are difficult to extract from the sleeve, so that the recovery fails. Secondly, in the stress process of the whole reinforced concrete structure in the recoverable reinforcement cage technology, the reinforcements mainly bear tensile force caused by bending moment caused by lateral soil pressure, and the concrete bears pressure, so that under the stress mode, the tension performance of the reinforcements is poor, and the supporting capability of the whole supporting structure is influenced. In addition, because a large amount of reinforcement is used to provide support in the reinforcement cage, the overall manufacturing cost is high in case of recovery failure.

SUMMERY OF THE UTILITY MODEL

It is a primary object of the present invention to provide a prefabricated cone member that addresses at least one of the above technical problems, as well as other potential technical problems.

In order to achieve the aim, the utility model provides a prefabricated cone head piece, wherein the prefabricated cone head piece (3) is arranged in a reinforcement cage of a detachable steel strand main reinforcement; the steel reinforcement cage also comprises a steel strand main reinforcement (1) and a supporting structural member (2); the prefabricated cone head piece (3) is arranged at the bottom of the reinforcement cage, is supported by the bottom of the support structural piece (2) when the reinforcement cage is lowered into a pile hole and is inserted into the bottom end (13) of the pile hole; the prefabricated cone piece (3) comprises an upper circular ring piece (91) in contact with the bottom of the supporting structural piece (2) and a lower cone piece (92) positioned below the upper circular ring piece (91).

According to the embodiment of the utility model, the upper circular ring piece (91) comprises a conical head main rib limiting hole (911) arranged along the circumference, and the conical head main rib limiting hole is used for enabling the steel strand main rib (1) to penetrate through.

According to an embodiment of the utility model, the upper ring member (91) comprises a boss (912) above it; and a lower end fixing device (85) positioned at the bottom of the supporting structural part (2) is sleeved on the outer side of the boss (912).

According to an embodiment of the present invention, the lower cone (92) includes claw portions (920) corresponding to the number of the strand main bars (1), and main bar guide grooves (921) provided at positions inside the claw portions (920).

According to the embodiment of the utility model, the steel strand main rib (1) penetrates through the conical head main rib limiting hole (911) at one side, then is clamped into the main rib guide groove (921), and then penetrates out of the conical head main rib limiting hole (911) from the other symmetrical side.

According to the embodiment of the utility model, a main bar hoop (922) for clamping the steel strand main bar (1) is further arranged at the top and/or bottom position of the main bar guide groove (921).

According to an embodiment of the utility model, the support structure (2) is arranged to support the steel strand main bars (1) in a direction from the pile hole top end (12) to the pile hole bottom end (13) and to support the prefabricated cone element (3) at the bottom.

According to an embodiment of the utility model, the support structure (2) comprises an upper end flange (81) and a support skeleton (84) located below the upper end flange (81); the upper circular ring piece (91) is in contact with the lower end of the supporting framework (84).

According to the embodiment of the utility model, the steel strand main reinforcement (1) is externally sleeved with a sleeve (10) or coated with a hot melt adhesive (11).

According to the embodiment of the utility model, the steel strand main reinforcement (1) is supported by the supporting structural member (2) and is inserted into the pile hole together with the prefabricated cone head member (3) before being recycled; when the steel strand main reinforcement (1) is recovered, the steel strand main reinforcement is drawn out from the sleeve (10) or is drawn out from the pile hole after the hot melt adhesive (11) is melted by heating.

According to an embodiment of the utility model, the steel strand main bar (1) has a first section (14) extending from the pile bore top end (12) to the pile bore bottom end (13), a second section (15) bent at the pile bore bottom end (13), and a third section (16) extending from the pile bore bottom end (13) to the pile bore top end (12).

According to an embodiment of the utility model, the second segment (15) is catenary and externally sheathed with an end steel conduit (4); the prefabricated cone (3) and the end steel conduit (4) are mutually fixed so that the second segment (15) is mounted on the prefabricated cone (3).

The utility model has the following advantages: the prefabricated cone head piece can provide guidance for a reinforcement cage of the detachable steel strand main reinforcement, so that the reinforcement cage of the detachable steel strand main reinforcement, which can be recycled, is low in cost and good in supporting effect, is manufactured and is used in a corresponding supporting structure.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a reinforcement cage of a detachable steel strand main reinforcement according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a sleeve sleeved outside a main reinforcement of a steel strand according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a steel strand main bar coated with a hot melt adhesive.

Fig. 4 is a schematic view of a portion of the structure of fig. 1.

Fig. 5 is a schematic view of a portion of the structure of fig. 1.

Fig. 6 is a schematic view of a portion of the structure of fig. 1.

Fig. 7 is a structural schematic diagram of the shape design of the steel strand main bar according to the embodiment of the utility model.

FIG. 8 is a schematic view of the support frame and prefabricated cone components of the preferred embodiment of the present invention.

Fig. 9 is a schematic view of a support frame and the like according to a preferred embodiment of the present invention.

Fig. 10 is a schematic view of the structure of an upper end flange, an upper end fixing device and the like of the preferred embodiment of the present invention.

Fig. 11 is a schematic structural view of an upper end flange according to a preferred embodiment of the present invention.

Fig. 12 is a schematic structural view of a calf leg piece according to a preferred embodiment of the utility model.

FIG. 13 is a schematic view of the lower end fixture and prefabricated cone members, etc., according to the preferred embodiment of the present invention.

Fig. 14 is a schematic view of the structure of a lower end fixing device and the like according to a preferred embodiment of the present invention.

FIG. 15 is a schematic structural view of a prefabricated cone member according to a preferred embodiment of the present invention.

Fig. 16 is a schematic structural view of an upper circular ring member according to a preferred embodiment of the present invention.

Fig. 17 is a schematic view of the construction of the lower cone of the preferred embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.

The stress bearing capacity (particularly the tension performance) of the steel strand is stronger than that of the steel bar, but the cost is lower, so the inventor of the patent finds that in the field of foundation pit support, the steel strand can be used for replacing the steel bar as a main bar of a steel bar cage and can be used as a recycling object of a recyclable support structure. Particularly, if the main reinforcement is a fully prestressed steel strand during the manufacturing of the steel reinforcement cage, the problems of high manufacturing cost (large steel quantity), low recovery rate (not beneficial to resource saving), high construction difficulty and the like when the steel reinforcement is used as the main reinforcement or the steel strand and the steel reinforcement are used as the main reinforcement in a mixed manner can be solved. In addition, in the steel reinforcement cage of the steel strand main reinforcement, the prestress applied by the steel strands can slow down the generation of oblique gaps in concrete engineering, and the shearing bearing capacity of the support pile can be further improved. Simultaneously, because the steel strand wires that excel in can effectively use, consequently prestressed concrete steel strand wires can make than the long and thin load-bearing structure that ordinary steel reinforcement cage span is bigger, the dead weight is littleer, can also effectually prevent the fracture of concrete, perhaps can restrict the width of fracture at least in harmless degree, improve the durability and the ductility of whole supporting construction. Therefore, the steel strand is used as a main reinforcement to manufacture a detachable reinforcement cage (such as a detachable catenary reinforcement cage) and is used as a supporting structure in the fields of cast-in-place piles and the like, so that the bearing capacity and the economic cost are more advantageous.

However, different from traditional steel bar type reinforcement cage, the following technical problems exist when the steel strand is adopted as the main reinforcement to manufacture the detachable reinforcement cage: a steel strand is a wire-like steel product formed by twisting a plurality of steel wires, and thus has physical properties greatly different from those of a steel bar. The steel strand has small rigidity but good tensile performance and almost zero compressive performance, and particularly, after the steel strand is assembled into a reinforcement cage which is dozens of meters long, the shape of the reinforcement cage is expected to be soft. At this moment, if adopt traditional steel reinforcement cage's hoist and mount mode, will certainly cause the dislocation of its upper main reinforcement, stirrup, erection muscle and buckle etc. to drop and damage even, cause unnecessary influence to steel strand formula steel reinforcement cage's function, so let it lift by crane and transfer the in-process to guarantee that certain degree's rigidity is very necessary, this also is the technological problem that this patent will solve.

In order to solve the technical problem, the embodiment of the patent provides a prefabricated cone head piece which can be used for manufacturing a reinforcement cage of a detachable steel strand main reinforcement (the reinforcement cage is a general name and does not mean that the reinforcement cage is made of a reinforcement, the steel strand is used as the main reinforcement in the patent, and a non-reinforcement is used as the main reinforcement). The specific design structure and technical scheme of this patent are introduced in detail as follows.

As shown in fig. 1 to 17, an embodiment of the present invention provides a prefabricated cone, where the prefabricated cone 3 is disposed in a reinforcement cage of a detachable steel strand main reinforcement; the steel reinforcement cage also comprises a steel strand main reinforcement 1 and a supporting structural member 2. The prefabricated cone head part 3 is arranged at the bottom of the reinforcement cage, is supported by the bottom of the support structural part 2 when the reinforcement cage is lowered into a pile hole and is inserted into the bottom end 13 of the pile hole; the prefabricated cone 3 comprises an upper circular ring 91 (fig. 16) in contact with the bottom of the support structure 2, and a lower cone 92 (fig. 17) below the upper circular ring 91.

It can be understood that because prefabricated cone 3 sets up the bottom of steel reinforcement cage, moreover when the stake hole is transferred to the steel reinforcement cage by the bottom sprag of bearing structure 2 inserts stake hole bottom 13, consequently can provide the guide (especially in the cage construction of inserting upside down) for the steel reinforcement cage of detachable steel strand wires owner muscle to produce the recoverable steel reinforcement cage that the cost is lower, support effectually, and be arranged in corresponding supporting construction. Advantageously, the steel strand main reinforcement 1 is adopted in the patent to replace a structure of a traditional reinforcement type reinforcement cage, wherein the reinforcement is used as a main reinforcement. Because its stress bearing capacity is stronger, and the cost is lower, consequently can make than the slender load-bearing structure that ordinary steel reinforcement cage span is bigger, the dead weight is littleer, can also effectual cracking that prevents the concrete. In this case, the composite material can be used as a support structure in the field of cast-in-place piles and the like, and is more advantageous in terms of both bearing capacity and economic cost.

According to an embodiment of the utility model, the support structure 2 is arranged to support the steel strand main bar 1 in a direction from the pile hole top end 12 to the pile hole bottom end 13 and to support the prefabricated cone element 3 at the bottom. For example, the prefabricated cone 3 is arranged at the bottom of the support structure 2, and the prefabricated cone 3 is supported by the bottom of the support structure 2 and inserted into the pile hole bottom end 13 when the reinforcement cage is lowered into the pile hole.

It will be appreciated that in this patent, it is preferable to use the support structure 2 for supporting the steel strand main reinforcement 1 in the direction from the pile hole top end 12 to the pile hole bottom end 13, and to use the prefabricated cone head 3 to be inserted into the pile hole bottom end 13 when the reinforcement cage is lowered into the pile hole, which further enables the overall structure to ensure a certain degree of rigidity during hoisting and lowering.

According to an embodiment of the present invention, as shown in fig. 1, 4, 5, and 6, the support structure 2 includes a plurality of erection bars 5 disposed at a plurality of positions from the pile hole top end 12 to the pile hole bottom end, and supports the main steel strand reinforcement 1 from an inner direction. For example, the erection bars 5 are uniformly arranged from the pile hole top end 12 to the pile hole bottom end, so that the main steel strand reinforcement 1 is supported, and the flexible deformation in the process of putting down the reinforcement cage is further reduced. In addition, the steel strand main reinforcement 1 can be bound with a stirrup 100, so that a better fixing effect can be achieved.

According to an embodiment of the present invention, the supporting structural member 2 includes an upper end flange 81 and a supporting framework 84 (for example, made of an aluminum alloy, for example, a hollow aluminum alloy cylindrical frame structure may be adopted, as shown in fig. 8 and 9) located below the upper end flange 81. The upper ring member 91 is in contact with the lower end of the support frame 84. As an example, the supporting structural member 2 is a construction device for assisting in hoisting and lowering, and not only can be used as an inner framework in the hoisting process to provide better rigidity and integrity to the steel strand reinforcement cage, so that the structure of the steel strand reinforcement cage is ensured to be complete, but also can be recycled after the auxiliary hoisting function is finished. For example, both the upper end flange 81 and the support frame 84 may be recycled after the internal concrete has reached a certain strength.

According to the embodiment of the present invention, as shown in fig. 10 and 11, the upper end flange 81 is provided with (e.g., uniformly provided) a flange main rib limiting hole 811 along the circumference, which allows the steel strand main rib 1 to pass through and enables the steel strand main rib 1 to be supported on the outer circumference of the supporting framework 84 (e.g., to achieve the effects of limiting, preventing the deformation of the whole structure, and increasing the rigidity). For example, the support frame 84 may be provided with a frame rib on the outer periphery thereof, and the frame rib supports the strand main rib 1 from the inside.

According to the embodiment of the utility model, lifting lugs 812 for lifting the reinforcement cage are symmetrically arranged on the upper side of the upper end flange 81. The lifting lugs 812 are designed to facilitate the lifting structure when lowering the reinforcement cage and may be welded to the upper end flange 81 or formed integrally, for example.

According to an embodiment of the present invention, the supporting structure 2 further comprises an upper end fixing device 82 located between the upper end flange 81 and the supporting frame 84, wherein the upper end fixing device 82 is fixed to the supporting frame 84 and detachably connected to the upper end flange 81 (for example, by a bracket 83) so as to hang the supporting frame 84 out of the pile hole during the recovery.

According to the embodiment of the present invention, the upper end fixing device 82 is sleeved in the central through hole 810 of the upper end flange 81, and detachably connected to the upper end flange 81 through the bracket members 83 (as shown in fig. 12, for example, four fixing devices are arranged in four directions of the upper end fixing device 82, and are symmetrically and uniformly distributed); the bracket member 83 is disposed below the upper end flange 81 and outside the upper end fixture 82.

For example, as shown in fig. 12, the leg member 83 has an L-shape, the upper sheet member 830 may be welded to the upper end flange 81 to be fixed, and the lower sheet member 831 may be detachably attached to the upper end fixture 82 by means of bolts (through screw holes 832) or the like. At this time, before the steel reinforcement cage is recovered, the upper end flange 81 and the upper end fixing device 82 can be fixedly mounted to each other through the bracket member 83, so that the steel reinforcement cage can be conveniently lowered. When the supporting framework 84 needs to be recovered, the bolts can be unscrewed, so that the bracket piece 83 is separated and separated from the upper end fixing device 82, and at this time, the supporting framework 84 can be lifted out through the inner wall lifting lugs 821, so that the supporting framework 84 is recovered integrally.

According to an embodiment of the utility model, the support structure 2 further comprises a lower end fixture 85; the lower end fixing means 85 is provided at the bottom of the support frame 84 and contacts the prefabricated cone member 3 (see fig. 13 and 14). As an example, the lower end fixing device 85 may be in close contact with the prefabricated cone 3 (e.g., abut against each other, but not fixed), for example, by tightening the main steel strand 1, the lower end fixing device 85 of the supporting structural member 2 abuts against the prefabricated cone 3 tightly, and is structurally stable during the whole lowering process), so as to achieve the purpose of fixing the steel strand reinforcement cage. It can be understood that the prefabricated cone 3 can be supported by the support framework 84 in close contact with the prefabricated cone 3, so that the resistance generated by the downward fork (downward placement) of the reinforcement cage in concrete is reduced in the process of the back-inserting cage (the reverse inserting cage), and the construction method is particularly suitable for the construction process of the back-inserting cage.

According to the embodiment of the utility model, as shown in fig. 15-16, the upper circular ring member 91 includes a conical-head main rib limiting hole 911 arranged along the circumference for allowing the steel strand main rib 1 to pass through. Therefore, the flange main rib limiting hole 811 and the conical head main rib limiting hole 911 are matched with each other, and the fixed installation of the steel strand main rib 1 at the upper end and the lower end can be realized (the steel strand main rib 1 can be tensioned at two ends on the ground).

According to an embodiment of the present invention, as shown in fig. 15 and 16, the upper ring member 91 includes a boss 912 thereon; the lower end fixing device 85 positioned at the bottom of the supporting structural part 2 is sleeved outside the boss 912. For example, the boss 912 is disposed at an inner side of the bit-limiting hole 911. According to the embodiment of the present invention, the lower tapered member 92 includes the claw portions 920 corresponding to the number of the strand wires 1, and the bar guide grooves 921 provided at positions inside the claw portions 920.

According to the embodiment of the utility model, as shown in fig. 17, after one side of the stranded wire main bar 1 passes through the conical head main bar limiting hole 911, the stranded wire main bar is clamped into the main bar guide groove 921, and then passes through the conical head main bar limiting hole 911 from the opposite side. According to the embodiment of the utility model, a main bar hoop 922 for clamping the steel strand main bar 1 is further arranged at the top and/or bottom of the main bar guide slot 921. For example, the end steel guide tube 4 is sleeved on the steel strand main bar 1 at a position close to the main bar guide groove 921, and at this time, the steel strand main bar 1 may be bent into a catenary shape to be clamped in the main bar guide groove 921 (the steel strand main bar 1 is stably fixed, which does not affect recycling of the structures of the steel strand main bar 1, the support framework 84 and the like), and the main bar hoop 922 is clamped.

In the installation process, for example, the main steel strand reinforcement 1 may first pass through the conical-head main reinforcement limiting hole 911 on one side of the upper circular ring member 91, then be clamped into the main reinforcement guide groove 921 of the lower conical member 92, and then pass out from the conical-head main reinforcement limiting hole 911 on the other side of the upper circular ring member 91, and at this time, the main steel strand reinforcement 1 is fixed at both ends (for example, both ends are fixed by using a fixing tool). According to such order, install whole steel strand wires owner muscle 1 in place (many steel strand wires owner muscle 1 can form the hollow cylindric on the whole this moment), then insert hollow cylindric steel strand wires owner muscle 1 with supporting framework 84, overlap the erection muscle 5 around supporting framework 84 from a pot head again to play the supporting role to steel strand wires owner muscle 1. Finally, the upper end flange 81 is aligned with each strand main reinforcement 1, and welded and bolted at both ends respectively by the bracket 83, thereby forming an integral reinforcement cage structure of the detachable strand main reinforcement.

According to an embodiment of the present invention, the steel strand main bar 1 is externally sheathed with a sheath 10 (e.g., PE or PVC pipe, as shown in fig. 2) or coated with a hot melt adhesive 11 (as shown in fig. 3). Before being recovered, the steel strand main reinforcement 1 is supported by the support structural member 2 and inserted into the pile hole together with the prefabricated cone head member 3. The steel strand main reinforcement 1 is drawn out of the sleeve 10 during recovery or is drawn out of the pile hole after the hot melt adhesive 11 is melted by heating. Here, by recycling the steel strand main reinforcement 1, the manufacturing cost can be saved, and green construction can be realized. And because the steel strand main reinforcement 1 is a complete steel strand, the whole structure can be recovered by drawing at one end, and the steel strand main reinforcement is very convenient.

According to an embodiment of the utility model, the steel strand main reinforcement 1 has a first section 14 extending from the pile hole top end 12 to the pile hole bottom end 13, a second section 15 bent at the pile hole bottom end 13, and a third section 16 extending from the pile hole bottom end 13 to the pile hole top end 12. For example, a complete main strand 1 can be formed from the first section 14, the second section 15 and the third section 16, so that tensioning can be performed at both ends by tensioning devices, thereby providing a stronger stress to the supporting structure.

According to a preferred embodiment of the present invention, as shown in fig. 7, this patent considers designing the shape of the second segment 15 as the shape of the catenary wire when designing the shape of the complete steel strand main bar 1 composed of the first segment 14, the second segment 15 and the third segment 16. Through tests, the catenary-shaped structure is most stable, the arch axis is most reasonable, and the supporting effect of the integral supporting structure is better. In particular, the second segment 15 should satisfy a mathematical function when it is in the shape of a catenary

Wherein cosh is a hyperbolic cosine function, a is a constant to be determined, y is a coordinate value of a y axis, and x is a coordinate value of an x axis. In order to determine the constant to be determinedCounting a, and further determining the specific shape of the catenary expressed by the mathematical function, wherein an initial value x0 of x is half of the pile diameter L of the reinforcement cage, and an initial value y0 of y is the height h of the catenary.

According to an embodiment of the utility model, the prefabricated cone 3 is located close to said second segment 15 and is reciprocally mounted with said second segment 15. During operation, the prefabricated cone head part 3 is inserted into the bottom end 13 of the pile hole when the reinforcement cage is lowered into the pile hole. By way of example, the second segment 15 is externally sheathed with the end steel guide tube 4, so as to facilitate the welding of the prefabricated cone element 3 to the end steel guide tube 4, for example, and thus the second segment 15 is mounted on the prefabricated cone element 3 to play a role in fixed mounting, so that the whole cone structure is stable (for example, the end steel guide tubes 4 in different directions at the intersection can also be fixed by welding).

As shown in fig. 1 and 6, the second segment 15 is in the form of a catenary and is externally sheathed with an end steel conduit 4. The prefabricated cone 3 and the end steel conduit 4 are mutually fixed (e.g. welded) so that the second segment 15 is mounted on the prefabricated cone 3. By way of example, the second section 15 and the end steel guide tube 4 are each formed as a catenary, and the specific shape thereof preferably adopts the catenary shape represented by the above mathematical function (so that the end steel guide tube 4 of a specific catenary type can be made for fixing and guiding the second section 15 of the strand main bar 1).

Embodiments of the present invention further provide a supporting structure, which includes a reinforcement cage of the detachable steel strand main reinforcement according to the above embodiments of the present invention. According to an embodiment of the utility model, the supporting structure comprises supporting piles, or double rows of piles, or continuous walls.

By way of example, a fender pile is a pile that primarily bears lateral thrust, and is generally used for foundation pit support, slope support, and landslide control, and bears horizontal soil pressure or landslide thrust. By way of example, the double-row piles are supporting and retaining structures which are arranged along the side wall of the foundation pit and are composed of rigid frames and crown beams formed by connecting front and rear rows of supporting piles and beams. As an example, a continuous wall is also called an underground continuous wall, which is a continuous concrete wall built underground in foundation engineering and used as a structure for intercepting water, preventing seepage, bearing and retaining water.

From the above description of the embodiments, it will be clear to those skilled in the art that the present invention may be implemented by other structures, and the features of the present invention are not limited to the above preferred embodiments. Any changes or modifications that can be easily conceived by those skilled in the art are also intended to be covered by the scope of the present invention.

Claims (12)

1. The prefabricated cone head piece is characterized in that the prefabricated cone head piece (3) is arranged in a reinforcement cage of a detachable steel strand main reinforcement; the steel reinforcement cage also comprises a steel strand main reinforcement (1) and a supporting structural member (2);

the prefabricated cone head piece (3) is arranged at the bottom of the reinforcement cage, is supported by the bottom of the support structural piece (2) when the reinforcement cage is lowered into a pile hole and is inserted into the bottom end (13) of the pile hole;

the prefabricated cone piece (3) comprises an upper circular ring piece (91) in contact with the bottom of the supporting structural piece (2) and a lower cone piece (92) positioned below the upper circular ring piece (91).

2. The prefabricated cone member according to claim 1, wherein said upper circular ring member (91) comprises a circumferentially arranged cone-head-main-rib-limiting hole (911) for passing said steel strand main rib (1).

3. Prefabricated cone piece according to claim 2, wherein said upper circular ring (91) comprises a boss (912) above it; and a lower end fixing device (85) positioned at the bottom of the supporting structural part (2) is sleeved on the outer side of the boss (912).

4. The prefabricated cone member as claimed in claim 2, wherein said lower cone member (92) includes claws (920) corresponding to the number of the strands (1), and a tendon guide groove (921) provided at an inner side position of the claws (920).

5. The prefabricated cone member as claimed in claim 4, wherein the steel strand main bars (1) are inserted into the main bar guide grooves (921) after passing through the cone main bar limiting holes (911) on one side, and then pass out of the cone main bar limiting holes (911) from the opposite side.

6. The prefabricated cone member as claimed in claim 4 or 5, wherein a main bar hoop (922) for clamping the strand main bar (1) is further provided at a top and/or bottom position of the main bar guide groove (921).

7. Prefabricated cone element according to any of claims 1-5, wherein said support structure (2) is arranged to support said steel strand main reinforcement (1) in a direction from the pile hole top end (12) to the pile hole bottom end (13) and to support said prefabricated cone element (3) at the bottom.

8. The prefabricated cone member according to claim 7, wherein said support structure (2) comprises an upper end flange (81) and a support skeleton (84) located below said upper end flange (81); the upper circular ring piece (91) is in contact with the lower end of the supporting framework (84).

9. Prefabricated cone element according to any one of claims 1 to 5, characterized in that the steel strand main bars (1) are externally sheathed with a sleeve (10) or coated with a hot melt adhesive (11).

10. Prefabricated cone element according to claim 9, characterized in that said steel strand main bars (1) are supported by said support structure (2) and inserted into said pile hole together with said prefabricated cone element (3) before being recovered; when the steel strand main reinforcement (1) is recovered, the steel strand main reinforcement is drawn out from the sleeve (10) or is drawn out from the pile hole after the hot melt adhesive (11) is melted by heating.

11. The prefabricated cone according to any one of claims 1 to 5, wherein said steel strand main reinforcement (1) has a first section (14) extending from a pile bore top end (12) to said pile bore bottom end (13), a second section (15) bent at said pile bore bottom end (13), and a third section (16) extending from said pile bore bottom end (13) to said pile bore top end (12).

12. Prefabricated cone element according to claim 11, characterized in that said second segment (15) is catenary and externally sheathed with an end steel conduit (4); the prefabricated cone (3) and the end steel conduit (4) are mutually fixed so that the second segment (15) is mounted on the prefabricated cone (3).

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