CN111877330B - U-shaped round steel pipe template system of hole digging annular foundation pile and construction method - Google Patents

Abstract

The invention discloses a U-shaped round steel pipe template system of a hole digging annular foundation pile and a construction method thereof. The beneficial effects of the invention are as follows: the round steel pipe template is formed by welding steel plates, steel plates with corresponding lengths can be selected according to the design size of the hole digging pile, the round steel pipe template encloses the welded steel plates and is not rectangular with the same width up and down, but trapezoid with the wide upper part and the narrow lower part, the diameter of an upper opening of the round steel pipe is guaranteed to be consistent with a construction design drawing, the diameter of an opening at the lower end of the round steel pipe is 0.1-0.2D less than the diameter of the opening at the upper end, and the round steel pipe template can form a round steel pipe mould with U-shaped uniform transition with the thick upper part and the thin lower part during welding.

Description

U-shaped round steel pipe template system of hole digging annular foundation pile and construction method

Technical Field

The invention relates to a positioning adjustable support and a mounting method thereof, in particular to a U-shaped round steel tube template system of a hole digging annular foundation pile and a construction method thereof, and belongs to the technical field of positioning adjustable supports and mounting methods thereof.

Background

With the rapid development of national economy and the continuous progress of construction science and technology, super high-rise buildings, super large bridges and other building (construction) structures are continuously emerging, due to the huge volume, partial super high-rise building foundation piles or bridge pile foundations in China adopt large-diameter manual hole digging piles (D is more than or equal to 2 m), and some areas design the large-diameter manual hole digging piles into hollow piles, so that the concrete consumption of about 50% can be saved under the condition that the mechanical property is unchanged compared with solid piles, the template system of the existing large-diameter manual hole digging pile supporting structure is two, the first is a combined steel template, the main idea is that a circular shape is formed in a pile hole by designing 4 circular arc steel plates and some joint plates, and in practical engineering, the method is overall and suitable for most projects, so that a plurality of protection walls can be assembled by using the same 4 universal plates, and the pile hole can be standardized, if the pile diameter of special size can still be realized by combining the universal plates and the joint plates, and the construction cost can be further saved by recycling the method after the construction is completed; the second construction method is a corrugated template system, the corrugated steel plate is rolled into a pipe joint after being pressed into corrugated steel plates, the bending rigidity of the corrugated steel is 22 times of that of a common flat steel plate with the same thickness, the corrugated steel plate is used as a light high-strength material, the safety in the construction process can be improved, meanwhile, the construction method also has the characteristic of convenience and rapidness in construction, and the corrugated steel plate is not dismantled in general and is used as a part of a pile structure after the construction is finished.

Therefore, a U-shaped round steel pipe template system of a hole-digging annular foundation pile and a construction method are needed to be designed, although the existing riding embedded part positioning adjustable support and the existing mounting method thereof are various, the general view still has some common problems, the template system of the existing supporting structure is too few in types, the engineering is huge and miscellaneous, the only system is applicable to all projects, the problem of unreasonable and inapplicable sometimes exists, the second and existing assembly systems are too complicated in steps in construction, the economical and practical effects are realized, the efficiency is low, the construction period is influenced, the third and the corrugated steel plate systems are wholly superior to the assembly systems, but due to the characteristic of inconvenient disassembly, the repeated use cannot be realized, the cost of the projects is improved to a certain extent, and unnecessary waste is caused.

Disclosure of Invention

The invention aims to solve the problems and provides a U-shaped round steel pipe template system of a hole digging annular foundation pile and a construction method.

The invention realizes the above purpose through the following technical scheme: a U-shaped round steel pipe template system of a hole digging annular foundation pile comprises a locking notch, a stratum, bottom sealing concrete, a hanging ring, a round steel pipe template, a positioning groove, a centering support, a transverse stiffening rib, a longitudinal stiffening rib, butter, a plastic film, a steel reinforcement cage, a protection wall, a mounting assembly, a steel return sheet and an anchor bolt; the utility model discloses a steel reinforcement cage is characterized by comprising a round steel pipe template, a locking notch, a steel reinforcement cage, a fixing assembly, a locating groove, a centering support, a transverse stiffening rib, a plastic film, a steel reinforcement cage nest, a centering support and a steel return sheet.

Preferably, in order to select the steel plates with corresponding lengths according to the needs, the round steel pipe template is formed by welding the steel plates and is according to the design size of the hole digging pile.

Preferably, in order to ensure that the round steel pipe template can form a round steel pipe template with a U-shaped uniform transition of which the upper part is thick and the lower part is thin during welding, the round steel pipe template encloses a welded steel plate and is not rectangular with the same width at the upper part and the lower part, but is trapezoid with the upper part wide at the lower part and the lower part, the diameter of an upper opening of the round steel pipe is ensured to be consistent with a construction design drawing, and the diameter of an opening at the lower end of the round steel pipe is 0.1-0.2D less than the diameter of an opening at the upper end.

Preferably, in order to realize the positioning of the hole bottom, the centering support 7 is fixed at the center of the bottom of the hole when the round steel pipe template is constructed, and the centering support 7 and the positioning groove 6 can be automatically nested together when the round steel pipe template is slowly hung in.

Preferably, in order to realize quick demoulding and integral recovery, the round steel tube template is isolated from the steel reinforcement cage through a plastic film and is connected with the steel reinforcement cage in a sliding mode through butter.

The construction method of the U-shaped round steel pipe template system of the hole digging annular foundation pile comprises the following steps:

step A, designing and manufacturing a round steel pipe template, a positioning groove and a centering support on the ground according to a pile construction design drawing; after the manufacturing of each part is finished, the tip of the positioning groove faces the inside of the round steel pipe template and is welded at the lower part of the round steel pipe template;

step B, performing locking notch at the position of the pile hole according to the designed size, performing hole digging operation downwards along the locking notch, performing pile hole protection wall construction every 1 linear meter until the elevation of the bottom of the designed hole is reached, and using plain concrete for sealing the bottom to finish the pile hole construction;

C, installing a centering support at the center of the bottom of the hole when the bottom-sealing concrete reaches 7d strength, overlapping the center point of the centering support with the center point of the bottom of the hole, uniformly distributing anchor bolts on the bottom-sealing concrete, and clamping the centering support by using a steel return sheet;

Step D, coating a layer of butter on the surface of the round steel tube template, and wrapping a layer of plastic film; placing aside for standby after finishing;

Step E, uniformly arranging 4-5 cross braces from top to bottom in the reinforcement cage 12; the reinforcement cage is hung into the pile hole by a crane, and the distance between the reinforcement cage and the surrounding guard walls is ensured to be equal, so that the reinforcement cage is positioned at the center of the pile hole; and fixing the reinforcement cage from the ground;

step F, integrally hoisting the U-shaped round steel pipe template, slowly lowering the template to enable the centering support to be embedded with the positioning groove, and ensuring that the axis of the round steel pipe template is vertical; waterproof foam is arranged at the gap between the round steel pipe template and the back cover concrete, so that slurry leakage during grouting is prevented;

step G, injecting concrete outside the round steel pipe die plate at one time, waiting for coagulation and curing;

Step H, after the concrete is initially set, inserting a long steel pipe penetrating through the two hanging rings, arranging a jack at each of two ends of the steel pipe, pushing the steel pipe upwards at a uniform speed, and hammering the round steel pipe template by using a gun machine; after the circular steel tube template is separated from the concrete, the circular steel tube template is lifted out by a crane;

Step I, removing a centering support, an anchoring bolt and a steel return sheet on the back cover concrete to finish the recovery construction of the template system;

and J, continuing to maintain the pile body to finish the construction of the annular foundation pile body.

The beneficial effects of the invention are as follows: the riding embedded part positioning adjustable support and the mounting method thereof are reasonable in design, the round steel pipe template is formed by welding steel plates, steel plates with corresponding lengths can be selected according to the design size of a hole digging pile, the round steel pipe template encloses the welded steel plates and is not rectangular with the same width up and down, but trapezoid with the upper width down and the narrow width down, the diameter of an upper opening of the round steel pipe is guaranteed to be consistent with a construction design drawing, the diameter of an opening at the lower end of the round steel pipe is required to be 0.1-0.2D less than that of the upper opening, the round steel pipe template can form a round steel pipe template with a U-shaped uniform transition from the upper thick to the lower thin during welding, the round steel pipe template can be fixed at the center of the bottom of a hole at first, and the round steel pipe template is slowly hung in the middle of the round steel pipe template, the round steel pipe template 7 and the positioning groove 6 can be automatically nested together, so that hole bottom positioning is realized, the round steel pipe template is isolated with a steel reinforcement cage through a plastic film, and the round steel pipe template is connected with the reinforcement cage in a sliding mode through butter, and the whole recovery is realized.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic view of a U-shaped round steel tube die plate assembly according to the present invention;

FIG. 3 is a schematic cross-sectional view of a round steel tube according to the present invention;

FIG. 4 is a schematic view of a centering support of the present invention;

FIG. 5 is a schematic view of a positioning slot according to the present invention;

FIG. 6 is a schematic view of a cross section of a stake hole of the present invention;

FIG. 7 is an enlarged fragmentary schematic view of a cross-sectional view of a stake hole in accordance with the present invention;

FIG. 8 is a schematic view of the centering support installation of the present invention;

FIG. 9 is a partially enlarged schematic illustration of the mounting assembly of the present invention;

fig. 10 is a schematic diagram of a mounting assembly of the present invention.

In the figure: 1. the steel pipe comprises a locking opening, 2 parts of stratum, 3 parts of back cover concrete, 4 parts of hanging rings, 5 parts of round steel pipe templates, 6 parts of positioning grooves, 7 parts of centering supports, 8 parts of transverse stiffening ribs, 9 parts of longitudinal stiffening ribs, 10 parts of butter, 11 parts of plastic films, 12 parts of plastic films, 13 parts of protection walls, 14 parts of mounting components, 15 parts of return steel sheets and 16 parts of anchor bolts.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 to 10, a U-shaped round steel pipe template system of a hole digging annular foundation pile comprises a locking notch 1, a stratum 2, a back cover concrete 3, a hanging ring 4, a round steel pipe template 5, a positioning groove 6, a centering support 7, a transverse stiffening rib 8, a longitudinal stiffening rib 9, butter 10, a plastic film 11, a reinforcement cage 12, a protection wall 13, a mounting assembly 14, a steel return sheet 15 and an anchor bolt 16; the locking notch 1 is designed at the top end of a pile hole in the stratum 2, the bottom sealing concrete 3 is poured at the bottom of the pile hole in the stratum 2, the hanging ring 4 is welded and fixed at the top end of the round steel pipe template 5, the round steel pipe template 5 is vertically clamped in the pile hole in the stratum 2, the positioning groove 6 is arranged at the bottom of the round steel pipe template 5, the centering support 7 is arranged on the upper surface of the bottom sealing concrete 3, the transverse stiffening ribs 8 are horizontally arranged on the inner wall of the round steel pipe template 5, the vertical setting of vertical stiffening rib 9 is on the inner wall of round steel pipe template 5, butter 10 is paintd on round steel pipe template 5 outer wall, plastic film 11 parcel is on round steel pipe template 5 outer wall, steel reinforcement cage 12 nested connection is outside round steel pipe template 5, dado 13 sets up the thigh on the outer wall of steel reinforcement cage 12, installation component 14 is fixed on centering support 7, return steel sheet 15 is fixed with centering support 7 through anchor bolt 16 connection, anchor bolt 16 vertically runs through and fixes in back cover concrete 3.

The round steel pipe template 5 is formed by welding steel plates, steel plates with corresponding lengths can be selected according to the design size of the hole digging pile, the round steel pipe template 5 encloses the welded steel plates and is not rectangular with the same width up and down, but trapezoid with the wide upper part and the narrow lower part, the diameter of an upper opening of the round steel pipe is guaranteed to be consistent with a construction design drawing, the diameter of an opening at the lower end of the round steel pipe is 0.1-0.2 DD smaller than that of the opening at the upper end, the round steel pipe template 5 can form a round steel pipe mould with the uniform transition of U shape with the thick upper part and the thin lower part during welding, the centering support 7 is fixed at the center of the bottom of a hole during construction of the round steel pipe template 5, the centering support 7 and the positioning groove 6 can be automatically nested together to realize hole bottom positioning, the round steel pipe template 5 is isolated from a steel reinforcement cage 12 through a plastic film 11, and is connected with the steel reinforcement cage 12 in a sliding mode through a butter 10, and the whole recovery is realized.

The construction method of the U-shaped round steel pipe template system of the hole digging annular foundation pile comprises the following steps:

step A, designing and manufacturing a round steel pipe template 5, a positioning groove 6 and a centering support 7 on the ground according to a pile construction design drawing; after the manufacturing of each part is completed, the tip of the positioning groove 6 faces the inside of the round steel pipe template 5 and is welded at the lower part of the round steel pipe template 5;

step B, constructing a locking notch 1 at the position of the pile hole according to the designed size, performing hole digging operation downwards along the locking notch 1, constructing a pile hole protecting wall 13 every 1 linear meter until the elevation of the bottom of the designed hole is reached, and using plain concrete for sealing the bottom to finish the construction of the pile hole;

Step C, when the strength of the bottom-sealing concrete 3 reaches 7d, installing a centering support 7 at the center of the bottom of the hole, overlapping the center point of the centering support 7 with the center point of the bottom of the hole, uniformly distributing anchor bolts 16 on the bottom-sealing concrete 3, and clamping the centering support 7 by using a steel return sheet 15;

Step D, coating a layer of butter 10 on the surface of the round steel tube template 5, and wrapping a layer of plastic film 11; placing aside for standby after finishing;

step E, uniformly arranging 4-5 cross braces from top to bottom in the reinforcement cage 12; hoisting the reinforcement cage 12 into the pile hole by using a crane, and ensuring equal distance between the reinforcement cage and the surrounding guard walls 13 so that the reinforcement cage is positioned at the center of the pile hole; and fixes the reinforcement cage 12 from the ground;

Step F, integrally hoisting the U-shaped round steel pipe template 5, slowly lowering the template to enable the centering support to be embedded with the positioning groove 6, and ensuring that the axis of the round steel pipe template 5 is vertical; a waterproof foam is arranged at the gap between the round steel pipe template 5 and the back cover concrete 3, so that slurry leakage during grouting is prevented;

Step G, injecting concrete outside the round steel pipe template 5 at one time, waiting for coagulation and curing;

Step H, after the concrete is initially set, inserting a long steel pipe penetrating through the two hanging rings 4, arranging a jack at each of two ends of the steel pipe, jacking the steel pipe upwards at a uniform speed, and hammering the round steel pipe template 5 by using a gun machine; after the round steel pipe template 5 is separated from the concrete, the round steel pipe template 5 is lifted out by a crane;

step I, removing the centering support 7, the anchor bolts 16 and the steel return sheets 15 on the back cover concrete 3 to finish the recovery construction of the template system;

and J, continuing to maintain the pile body to finish the construction of the annular foundation pile body.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (1)

1. A construction method of a U-shaped round steel pipe template system of a hole digging annular foundation pile is characterized by comprising the following steps:

The U-shaped round steel pipe template system of the hole digging annular foundation pile comprises a locking notch (1), a stratum (2), bottom sealing concrete (3), a lifting ring (4), a round steel pipe template (5), a positioning groove (6), a centering support (7), transverse stiffening ribs (8), longitudinal stiffening ribs (9), butter (10), a plastic film (11), a steel reinforcement cage (12), a retaining wall (13), a mounting assembly (14), a steel return sheet (15) and an anchor bolt (16); the locking notch (1) is designed at the top end of a pile hole in the stratum (2), the bottom sealing concrete (3) is poured at the bottom of the pile hole in the stratum (2), the lifting ring (4) is welded and fixed at the top end of the round steel pipe template (5), the round steel pipe template (5) is vertically clamped in the pile hole in the stratum (2), the positioning groove (6) is formed in the bottom of the round steel pipe template (5), the centering support (7) is arranged on the upper surface of the bottom sealing concrete (3), the transverse stiffening rib (8) is horizontally arranged on the inner wall of the round steel pipe template (5), the longitudinal stiffening rib (9) is vertically arranged on the inner wall of the round steel pipe template (5), butter (10) is smeared on the outer wall of the round steel pipe template (5), the plastic film (11) is wrapped on the outer wall of the round steel pipe template (5), the steel reinforcement cage (12) is connected with the outer wall of the round steel pipe template (5) in a nested manner, the centering support (13) is arranged on the inner wall of the round steel pipe template (5) and is fixedly connected with the centering support (16) through a vertical bolt (16) and the centering support (16) is fixedly arranged on the steel bolt (3;

The round steel pipe template (5) is formed by welding steel plates and is according to the design size of the hole digging pile;

the round steel pipe template (5) encloses the welded steel plate and is not rectangular with the same width at the upper part and the lower part, but trapezoidal with the width at the upper part and the narrow at the lower part, the diameter of the upper opening of the round steel pipe is ensured to be consistent with the construction design drawing, and the diameter of the opening at the lower end of the round steel pipe is 0.1-0.2D less than the diameter of the opening at the upper end, wherein D is the diameter of the upper opening;

when the round steel pipe template (5) is constructed, the centering support (7) is fixed at the right center of the bottom of the hole, and when the round steel pipe template (5) is slowly hung in, the centering support (7) and the positioning groove (6) can be automatically nested together;

The round steel pipe template (5) is isolated from the steel reinforcement cage (12) through a plastic film (11) and is connected with the steel reinforcement cage (12) in a sliding manner through butter (10);

the construction method comprises the following steps:

step A, designing and manufacturing a round steel pipe template (5), a positioning groove (6) and a centering support (7) on the ground according to a pile construction design drawing; after the manufacturing of each part is finished, the tip of the positioning groove (6) faces the inside of the round steel pipe template (5) and is welded at the lower part of the round steel pipe template (5);

Step B, constructing a locking notch (1) at the position of the pile hole according to the designed size, performing hole digging operation downwards along the locking notch (1), constructing a pile hole protecting wall (13) every 1 linear meter until the elevation of the bottom of the designed hole is reached, and using plain concrete for sealing the bottom to finish the construction of the pile hole;

Step C, the concrete (3) to be sealed reaches 7d strength, a centering support (7) is arranged at the center of the bottom of the hole, the center point of the centering support (7) is overlapped with the center point of the bottom of the hole, anchor bolts (16) are uniformly distributed on the concrete (3) to be sealed, and a steel return sheet (15) is used for clamping the centering support (7);

Step D, coating a layer of butter (10) on the surface of the round steel pipe template (5) in a thick way, and wrapping a layer of plastic film (11) again; placing aside for standby after finishing;

step E, uniformly arranging 4-5 cross braces from top to bottom in the reinforcement cage (12); hoisting the reinforcement cage (12) into the pile hole by using a crane, and ensuring equal distance between the reinforcement cage and the surrounding guard walls (13) so that the reinforcement cage is positioned at the center of the pile hole; and fixing the reinforcement cage (12) from the ground;

Step F, integrally hoisting the U-shaped round steel pipe template (5), slowly lowering the template to enable the centering support to be embedded with the positioning groove (6) and ensure that the axis of the round steel pipe template (5) is vertical; waterproof foam is arranged at the gap between the round steel pipe template (5) and the back cover concrete (3) to prevent slurry leakage during grouting;

step G, injecting concrete outside the round steel pipe template (5) at one time, waiting for coagulation and curing;

Step H, after the initial setting of the concrete, inserting a long steel pipe penetrating through the two hanging rings (4), arranging a jack at two ends of the steel pipe respectively, jacking the steel pipe upwards at a uniform speed, and hammering the round steel pipe template (5) by using a gun machine; after the steel pipe is separated from the concrete, the round steel pipe template (5) is lifted out by a crane;

step I, removing a centering support (7), an anchor bolt (16) and a steel return sheet (15) on the back cover concrete (3) to finish the recovery construction of a template system;

and J, continuing to maintain the pile body to finish the construction of the annular foundation pile body.