CN216339589U - Prefabricated concrete pier support on island type bottom plate of foundation pit supporting system and preparation tool thereof - Google Patents

Abstract

The utility model discloses a prefabricated concrete pier support on an island type bottom plate of a foundation pit supporting system and a preparation tool thereof, wherein the preparation tool comprises front, rear, left and right templates, square wood edges and hooping steel hoop frames; the left or right templates are both a vertical integral plate which consists of an upper trapezoidal part and a lower rectangular part; the forward or backward templates are respectively composed of an upper inclined plate and a lower vertical plate, and the lower end of a square wood ridge of the upper inclined plate and the upper end of a square wood ridge of the lower vertical plate are tightly nailed by nails; the concrete pier support comprises a reinforcement cage and a concrete block for anchoring the reinforcement cage; the concrete block is a combination body formed by an upper trapezoidal block and a lower rectangular block, and the rear side of the upper trapezoidal block is provided with a rear inclined plane. The concrete pier support and the preparation tool thereof can reduce the precision requirement of the concrete anchoring depth of the lower part of the prepared concrete pier support and the island type bottom plate and save materials.

Description

Prefabricated concrete pier support on island type bottom plate of foundation pit supporting system and preparation tool thereof

Technical Field

The utility model relates to the technical field of building foundation pit construction, in particular to a prefabricated concrete pier support on an island type base plate of a foundation pit supporting system and a tool for preparing the concrete pier support.

Background

With the development of economy, underground space construction is more and more frequent, and the construction technology of a foundation pit supporting system for supporting, reinforcing and protecting the underground space is greatly improved. In recent years, in order to avoid exceeding the red line of a construction project, relevant policies prohibit the soft soil deep foundation pit from adopting a soil anchor rod for supporting; the supporting form of the traditional fender post and the horizontal inward inner support is higher in manufacturing cost; therefore, the combined supporting form of the fender post combined with the steel pipe diagonal bracing in the foundation pit is increasingly widely applied.

The traditional construction method of the combined support is roughly as follows: constructing a circle of a plurality of fender piles around the edge of the foundation pit, and constructing a capping beam at the top of each fender pile; then performing basin-type excavation, constructing an island-type bottom plate at the bottom of the excavated basin-type foundation pit, pouring and tamping each concrete pier support together with the island-type bottom plate, and abutting and welding the upper end of each steel pipe diagonal brace against a top compression beam and the lower end against the concrete pier support; and after the welding and supporting of the circle of steel pipe diagonal braces at the periphery of the foundation pit is finished, excavating a circle of triangular soil body left at the outer edge of the foundation pit, pouring and tamping the concrete of the basement bottom plate except the island-type bottom plate, and finally removing each steel pipe diagonal brace.

The construction method has the following defects that when the island-type bottom plate and each concrete pier support are integrally constructed on site, the operation is complicated, the island-type bottom plate reinforcing mesh needs to be bound and placed on the concrete cushion layer, then the concrete pier support reinforcing cage is bound, the split heads need to be placed on the concrete cushion layer, four templates of the concrete pier support are erected and placed on the split heads, the four templates are hooped by the hoops, and the concrete of the bottom plate and the concrete pier support is integrally poured and tamped, so the workload is high, the labor cost is high, time and labor are wasted, and the efficiency is low; moreover, before the concrete of the bottom plate and the concrete pier supports are integrally poured, all templates, hoops and the like of each concrete pier support are required to be installed on the island-type bottom plate, the concrete supports cannot be detached until the concrete is poured and hardened, and a large amount of materials such as the template hoops cannot be circulated due to retention, so that the economical efficiency is poor.

In order to overcome the defects, a technical scheme of constructing a combined support by using a prefabricated concrete pier support appears in the industry in recent years, for example, the utility model patent with application number of 201310535134, named as a bracket at the lower end of an inclined inner support of a foundation pit supporting structure, a manufacturing tool and a construction method discloses the bracket at the lower end of the inclined inner support (namely the concrete pier support of the application), the manufacturing tool of the bracket and the construction method by using the bracket. The bracket comprises a reinforcement cage and a wedge-shaped concrete block for anchoring the reinforcement cage; the concrete block is anchored with an embedded steel plate on the inclined surface, and the inner surface of the embedded steel plate is provided with an inclined anchor bar which is connected with a reinforcement cage; and the top of the wedge-shaped concrete block is provided with a lifting ring, the bottom of the wedge-shaped concrete block is provided with a vertical anchor bar, and the lifting ring and the vertical anchor bar are both connected with a reinforcement cage. The manufacturing tool of the bracket comprises four side formworks, a bottom formwork and a steel hoop frame consisting of split bolts and horizontal steel pipes, wherein a square timber ridge is arranged outside each side formwork, the four side formworks and the square timber ridge are hooped by the steel hoop frame, and the bottom formwork is provided with holes for vertical anchor bars to pass through. The construction method comprises the steps of prefabricating a plurality of corbels with lifting rings on the upper portions and vertical anchor bars protruding on the lower portions by using tools in a factory, laying a cushion layer at the bottom of the basin-type foundation pit, binding a bottom plate reinforcing mesh, lifting each prefabricated corbel to the bottom of the foundation pit through the lifting rings, pouring island-type bottom plate concrete and anchoring each prefabricated corbel.

The scheme solves the problems that in the traditional construction, the bracket needs to be bound and poured on site, the operation is complicated and labor-consuming, and the materials such as the template are retained for a long time, so that the turnover utilization rate is low; however, in practical application, the structure, tools and construction method of the prefabricated steel bracket still have a series of problems. Firstly, the bracket is wedge-shaped, the precision requirement of the actual anchoring depth of the lower end of the bracket in the bottom plate concrete is high, the control is difficult, if the concrete pouring amount is large, the top surface of the island type bottom plate is higher than the bottom surface of the bracket, so that the lower part of the embedded steel plate is also embedded in the bottom plate concrete, the welding area of the lower end of the steel pipe diagonal brace and the embedded steel plate is reduced, the supporting performance of the steel pipe diagonal brace is directly reduced, if the concrete pouring amount is small, the top surface of the island type bottom plate is lower than the bottom surface of the bracket, so that the anchoring of the bracket and the island type bottom plate is not firm and tight, therefore, only the concrete pouring amount is moderate, the top surface of the island type bottom plate and the bottom surface of the bracket are just flush, the supporting can be ensured, but the concrete pouring amount is difficult to control accurately in actual construction; moreover, the bracket is wedge-shaped and square in overlooking shape, the shape is not reasonable, because the steel pipe is supported against the inclined plane of the front side of the bracket in an inclined way from the stress angle analysis, namely, the steel pipe transmits force downwards to the bottom surface of the bracket from the inclined plane of the front side of the bracket at an angle vertical to the inclined plane of the front side, and the triangular area part between the top surface and the back side surface of the bracket is not stressed, so that the existence of the concrete forms material waste; the overlooking shape is square, and the bearing resistance is general; each steel hoop frame for hooping the template is composed of two opposite-pulling bolts at the front side and the rear side, four horizontal steel pipes at the left side and the right side and four mountain-going buckles at the four corners, so that the steel hoop frame has more parts and materials and wastes time and labor in the assembling process; moreover, the bottom template in the preparation tool is too thin, so that the vertical anchor bars penetrating through the bottom template and embedded in the brackets are shorter, and the lapping and anchoring effects with the reinforcing mesh of the island type base plate are common.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a tool for preparing a prefabricated concrete pier support on an island bottom plate of a foundation pit supporting system, which can reduce the precision requirement of the concrete anchoring depth of the lower part of the prepared concrete pier support and the island bottom plate and save materials.

The utility model provides a tool for preparing a prefabricated concrete pier support on an island-type bottom plate of a foundation pit supporting system, which comprises formworks in four directions, namely front, back, left and right directions, square wood ridges fixed on the outer surface of each formwork and a plurality of steel hoop frames for hooping the formworks and the square wood ridges; the left or right templates are both a vertical integral plate which consists of an upper trapezoidal part and a lower rectangular part; the forward or backward template is composed of an upper inclined plate and a lower vertical plate, and the lower end of the square wood ridge of the upper inclined plate and the upper end of the square wood ridge of the lower vertical plate are tightly nailed by nails.

Another technical problem to be solved by the utility model is to provide a prefabricated concrete pier support manufactured by using the manufacturing tool, which can avoid the lower part of the embedded steel plate from being buried by the island type concrete bottom plate, can ensure that the concrete connection between the bottom end of the concrete pier support and the island type concrete bottom plate is firm and tight, and can save materials.

Another technical solution of the present invention is to provide a precast concrete pier support manufactured by using the manufacturing tool of the present application, which includes a reinforcement cage and a concrete block anchoring the reinforcement cage; an embedded steel plate is anchored on the front side inclined surface of the concrete block, an inclined anchor bar is arranged on the inner surface of the embedded steel plate, and the inclined anchor bar is connected with a reinforcement cage; a lifting ring is arranged on the top of the concrete block in a protruding mode, a vertical anchor bar is arranged on the bottom of the concrete block in a protruding mode, and the lower end of the lifting ring and the upper end of the vertical anchor bar are connected with a reinforcement cage; the concrete block is a combination body formed by an upper trapezoidal block and a lower rectangular block, and the rear side of the upper trapezoidal block is provided with a rear inclined plane.

Compared with the prior art, the preparation tool with the structure and the prefabricated concrete pier support manufactured by the preparation tool have the following advantages.

The template with the special shape can be used for preparing the combined concrete block of the upper trapezoidal block and the lower rectangular block, so that the existing of the lower rectangular block reduces the precision requirement on the anchoring depth of the concrete pier support in the bottom plate concrete in actual construction, the concrete pouring operation is easy to control, namely the fault tolerance of the concrete pouring amount is large, and only the top surface height of the bottom plate concrete is required to be within the height range of the lower rectangular block; therefore, the lower end of the inclined strut of the steel pipe is not affected by the embedding of the island-type bottom plate concrete in the embedded steel plate, and the lower part of the concrete pier support and the island-type bottom plate concrete are not firmly anchored; the operation precision requirement of pouring island type bottom plate concrete is obviously reduced; and compared with the wedge-shaped concrete block in the prior art, the upper trapezoidal block of the concrete block removes concrete in a triangular area between the top surface and the rear side surface which are not stressed originally, so that the using amount of concrete materials without supporting effect is reduced, and the manufacturing cost is reduced.

Preferably, the preparation tool comprises a concrete tire membrane at the bottom, and the height of the concrete tire membrane is greater than that of the lower vertical plate; the top surface of the concrete tire membrane is provided with a plurality of blind holes which are opened upwards and used for accommodating vertical anchor bars of a concrete pier support; the concrete bed-jig possesses sufficient thickness to the degree of depth of blind hole has been guaranteed, and when preparing the concrete pier support, the perpendicular anchor bar that the lower arch is in concrete pier support bottom surface just holds in the blind hole of concrete bed-jig, has guaranteed the degree of depth of blind hole and has just guaranteed the length of perpendicular anchor bar, guarantees that the concrete pier support possesses sufficient anchor length, has also guaranteed the anchor firmness of concrete pier support and island formula bottom plate promptly.

Preferably, a plurality of rectangular cushion blocks extending in the left-right direction are fixed on the top surface of the concrete tire membrane through nails; correspondingly, a plurality of shear grooves extending in the left-right direction are formed in the bottom surface of the rectangular block at the lower part of the concrete pier support; like this, effectively strengthened concrete pier support bottom and island formula bottom plate concrete bonding anchor's firmness, above-mentioned reinforcement measure is very necessary, because concrete pier support bottom is heightened, has add the lower part rectangular block, so through the firmness of shearing groove increase concrete pier support bottom, avoid it to increase back unstability.

As still further preferable, the width of the overall plate of the manufacturing tool is larger than the width of the upper sloping plate or the lower vertical plate; correspondingly, the projection of the concrete block of the concrete pier support in the overlooking direction is a rectangle, and the front-back dimension of the rectangle is larger than the left-right dimension; thus, since the force is supported and transmitted in the forward and backward direction rather than the leftward and rightward direction, the load-resisting performance of the concrete pier support is enhanced.

As a further preference of the tool, an inner support sleeve extending along the left-right direction is abutted between the left-direction template and the right-direction template; the forward upper inclined plate and the backward upper inclined plate respectively abut against two side edges of the trapezoidal part on the integral plate, and the forward lower vertical plate and the backward lower vertical plate respectively abut against two side edges of the lower rectangular part of the integral plate; therefore, the templates can be quickly and conveniently erected only by abutting the left and right templates against the inner supporting sleeve, abutting the front and rear templates against the two sides of the erected left and right templates and hooping the outer sides of the templates by the steel hoop frames.

As another preferable mode of the tool, each steel hoop frame is composed of four flat iron hoops which are connected end to end, the head end of each flat iron hoop is a U-shaped buckle, the tail end of each flat iron hoop is provided with a slot, the U-shaped buckle at the head end of each flat iron hoop is hung at the tail end of the previous flat iron hoop, and the slot at the tail end of each flat iron hoop is inserted with a bolt for abutting against the U-shaped buckle of the next flat iron hoop; above-mentioned per road steel hoop frame only has four main parts, compares two split bolts, four horizontal steel pipes and four mountain rows of prior art and detains, and this application steel hoop frame spare part is few, and the consumptive material is few, and the assembly is swiftly convenient.

Drawings

Fig. 1 is a schematic structural view of a prefabricated concrete pier support reinforcement cage on an island type base plate of the foundation pit supporting system.

Fig. 2 is a schematic structural view of a prefabricated concrete pier support on an island type bottom plate of the foundation pit supporting system.

Fig. 3 is a schematic view of the structure of fig. 2 after being deflected by a certain angle.

Fig. 4 is a schematic structural view of a tool for preparing a prefabricated concrete pier support on an island-type base plate of the foundation pit supporting system.

Fig. 5 is a schematic view of the structure of fig. 4 with a portion of the template removed.

Fig. 6 is a schematic structural diagram of a concrete tire membrane of a tool for preparing a prefabricated concrete pier support on an island-type bottom plate of the foundation pit supporting system.

The concrete reinforcing steel bar comprises 1 square wood ridge, 2 steel hoop frame, 2.1 flat iron hoop, 2.2U-shaped buckle, 2.3 slot, 2.4 bolt, 3 integral plate, 3.1 upper trapezoidal part, 3.2 lower rectangular part, 4 upper inclined plate, 5 lower vertical plate, 6 nail, 7 concrete tire membrane, 8 vertical anchor bar, 9 blind hole, 10 rectangular cushion block, 11 inner support sleeve, 12 reinforcing steel bar cage, 13 concrete block, 13.1 upper trapezoidal block, 13.2 lower rectangular block, 14 embedded steel plate, 15 inclined anchor bar, 16 lifting ring, 17 shear groove, 18 rear inclined plane, 19 plastic sleeve, 20 wedge-shaped cushion block and the like.

Detailed Description

The utility model is further described with reference to the following figures and specific examples.

As shown in fig. 1 to 3, the tool for preparing the precast concrete pier support on the island-type base plate of the foundation pit supporting system comprises formworks in four directions, namely, front, back, left and right directions, square wooden ridges 1 fixed on the outer surface of each formwork, and a plurality of steel hoop frames 2 for hooping the formworks and the square wooden ridges 1. Specifically, the square wood edge 1 is fixed on the outer surface of the corresponding formwork by nails 6.

The left-hand or right-hand formwork is a vertical, integral plate 3, which integral plate 3 is formed by an upper trapezoidal part 3.1 and a lower rectangular part 3.2. The template in the front side direction is composed of an upper inclined plate 4 and a lower vertical plate 5, and the template in the rear side direction is also composed of an upper inclined plate 4 and a lower vertical plate 5. The fixed mode that all is located the upper sloping plate 4 and the riser 5 of front side or all is located the rear side does, and the stupefied 1 lower extreme of square timber of upper sloping plate 4 and the stupefied 1 upper end of square timber of riser 5 are followed closely by nail 6.

The preparation tool also comprises a concrete tire membrane 7 at the bottom, and the height of the concrete tire membrane 7 is greater than that of the lower vertical plate 5; the top surface of the concrete tire membrane 7 is provided with a plurality of blind holes 9 which are opened upwards and are used for containing the vertical anchor bars 8 of the concrete pier support, each vertical anchor bar 8 is sleeved with a plastic sleeve 19, and the plastic sleeve 19 fills the gap between the vertical anchor bar 8 and the corresponding blind hole 9.

The top surface of the concrete tire membrane 7 is also fixed with a plurality of rectangular cushion blocks 10 extending along the left-right direction by the nails 6.

The upper sloping plate 4 and the lower vertical plate 5 have the same width, and the width of the integrated plate 3 is larger than the width of the upper sloping plate 4 or the lower vertical plate 5.

Two inner support sleeves 11 extending in the left-right direction are abutted between the left-direction formwork and the right-direction formwork. The forward upper inclined plate 4 and the backward upper inclined plate 4 respectively abut against two sides of the trapezoidal part 3.1 on the integral plate 3, and the forward lower vertical plate 5 and the backward lower vertical plate 5 respectively abut against two sides of the rectangular part 3.2 under the integral plate 3. In other words, the inner sides of the left and right formworks abut against both ends of the inner support sleeve 11, and the inner sides of the front and rear formworks abut against both sides of the left and right formworks, and the formworks in the above four directions are banded from the outside by the plurality of steel hoop frames 2.

Every way steel hoop frame 2 comprises four band iron hoops 2.1 of end to end, and every band iron hoop 2.1 head end is the U-shaped knot 2.2 and the tail end establishes a plurality of slots 2.3, and the U-shaped knot 2.2 hook of every band iron hoop 2.1 head end catches the tail end of preceding band iron hoop 2.1, and every band iron hoop 2.1 tail end slot 2.3 grafting bolt 2.4, and this bolt supports and tightly withstands a back band iron hoop 2.1U-shaped knot 2.2 and prevents that back band iron hoop 2.1 from expanding outward.

In order to ensure that the inclined formwork of the upper inclined plate 4 is stably installed, a wedge-shaped cushion block 20 is arranged between the front or rear flat iron hoop 2.1 and the front or rear upper inclined plate 4.

As shown in fig. 4 to 6, the precast concrete pier support manufactured by using the preparation tool of the present invention includes a reinforcement cage 12 and a concrete block 13 covering the reinforcement cage 12. An embedded steel plate 14 is anchored on the front side inclined surface of the concrete block 13, an inclined anchor bar 15 is welded on the inner surface of the embedded steel plate 14, and the inclined anchor bar 15 is bound or welded with the reinforcement cage 12. A lifting ring 16 is arranged on the top of the concrete block 13 in a protruding mode, a vertical anchor bar 8 is arranged on the bottom of the concrete block 13 in a protruding mode, and the lower end of the lifting ring 16 and the upper end of the vertical anchor bar 8 are bound or welded with the reinforcement cage 12. The concrete block 13 is a combination body formed by an upper trapezoidal block 13.1 and a lower rectangular block 13.2, the rear side of the upper trapezoidal block 13.1 is also an inclined plane, namely, the rear side of the upper trapezoidal block 13.1 is provided with a rear inclined plane 18.

The bottom surface of the lower rectangular block 13.2 is provided with a plurality of shear grooves 17 extending in the left-right direction.

The projection of the concrete block 13 in the overlooking direction is a rectangle, and the front-back dimension of the rectangle is larger than the left-right dimension.

Claims (9)

1. A tool for preparing a prefabricated concrete pier support on an island-type bottom plate of a foundation pit supporting system comprises formworks in four directions, namely front, back, left and right directions, square timber ridges (1) fixed on the outer surface of each formwork and a plurality of steel hoop frames (2) for hooping the formworks and the square timber ridges (1); the method is characterized in that: the left or right templates are both a vertical integral plate (3), and the integral plate (3) consists of an upper trapezoidal part (3.1) and a lower rectangular part (3.2); the forward or backward template is composed of an upper inclined plate (4) and a lower vertical plate (5), and the lower end of the square wood edge (1) of the upper inclined plate (4) is tightly nailed with the upper end of the square wood edge (1) of the lower vertical plate (5) through a nail (6).

2. The tool for preparing the prefabricated concrete pier support on the island type base plate of the foundation pit supporting system according to claim 1, wherein the tool comprises: the concrete bottom wall comprises a concrete tire membrane (7) at the bottom, wherein the height of the concrete tire membrane (7) is greater than that of a lower vertical plate (5); the top surface of the concrete tire membrane (7) is provided with a plurality of blind holes (9) which are opened upwards and are used for containing vertical anchor bars (8) of a concrete pier support.

3. The tool for preparing the prefabricated concrete pier support on the island type base plate of the foundation pit supporting system according to claim 2, wherein the tool comprises: the top surface of the concrete tire membrane (7) is also fixed with a plurality of rectangular cushion blocks (10) extending along the left-right direction by nails (6).

4. The tool for preparing the prefabricated concrete pier support on the island type base plate of the foundation pit supporting system according to claim 1, wherein the tool comprises: the width of the integral plate (3) is larger than that of the upper inclined plate (4) or the lower vertical plate (5).

5. The tool for preparing the prefabricated concrete pier support on the island type base plate of the foundation pit supporting system according to claim 1, wherein the tool comprises: an inner support sleeve (11) extending along the left-right direction is abutted between the left-direction template and the right-direction template; the forward upper inclined plate (4) and the backward upper inclined plate (4) are respectively abutted against two side edges of the upper trapezoidal part (3.1) of the integral plate (3), and the forward lower vertical plate (5) and the backward lower vertical plate (5) are respectively abutted against two side edges of the lower rectangular part (3.2) of the integral plate (3).

6. The tool for preparing the prefabricated concrete pier support on the island type base plate of the foundation pit supporting system according to claim 1, wherein the tool comprises: each steel hoop frame (2) is composed of four flat iron hoops (2.1) which are connected end to end, the head end of each flat iron hoop (2.1) is a U-shaped buckle (2.2), the tail end of each flat iron hoop (2.1) is provided with a slot (2.3), the U-shaped buckle (2.2) at the head end of each flat iron hoop (2.1) hooks the tail end of the previous flat iron hoop (2.1), and the slot (2.3) at the tail end of each flat iron hoop (2.1) is spliced with a bolt (2.4) for abutting against the U-shaped buckle (2.2) of the next flat iron hoop (2.1).

7. A precast concrete pier footing manufactured by using the manufacturing tool of claim 1, which comprises a reinforcement cage (12) and a concrete block (13) anchoring the reinforcement cage (12); an embedded steel plate (14) is anchored on the front side inclined surface of the concrete block (13), an inclined anchor bar (15) is arranged on the inner surface of the embedded steel plate (14), and the inclined anchor bar (15) is connected with the reinforcement cage (12); a lifting ring (16) is arranged on the top of the concrete block (13) in a protruding mode, a vertical anchor bar (8) is arranged on the bottom of the concrete block (13) in a protruding mode, and the lower end of the lifting ring (16) and the upper end of the vertical anchor bar (8) are connected with a reinforcement cage (12); the method is characterized in that: the concrete block (13) is a combination body formed by an upper trapezoidal block (13.1) and a lower rectangular block (13.2), and a rear inclined plane (18) is arranged on the rear side of the upper trapezoidal block (13.1).

8. The precast concrete pier support according to claim 7, wherein: the bottom surface of the lower rectangular block (13.2) is provided with a plurality of shear grooves (17) extending along the left-right direction.

9. The precast concrete pier support according to claim 7, wherein: the projection of the concrete block (13) in the overlooking direction is a rectangle, and the front-back dimension of the rectangle is larger than the left-right dimension.

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