CN111705793A - A kind of artificial digging pile prefabricated retaining wall construction method - Google Patents

Abstract

The invention is applicable to the technical field of hole pile protection wall construction, and provides a construction method for artificially digging a hole pile prefabricated protection wall. 4 of the standard blocks, 2 adjacent blocks and 1 encapsulation block are enclosed to form a retaining wall, a plurality of retaining rings are stacked in the axial direction to form a retaining wall segment, and the adjacent retaining walls in each said retaining wall segment Through the bolted connection, the pile holes are excavated downward along the height direction of the pre-designed pile holes. When a pile hole section with a preset depth is dug, a retaining wall section is supported in the pile hole section, and a retaining wall section is set up in the pile hole section. After the support of a retaining wall section is completed, the cement slurry is injected until the retaining wall supporting of the pre-designed pile hole depth is completed, and finally the reinforcement cage is hoisted, and the pile body concrete is poured. Wide range of properties, segment thickness and flexible adjustment, higher safety.

Description

A kind of artificial digging pile prefabricated retaining wall construction method

technical field

The invention belongs to the technical field of hole pile protection wall construction, and in particular relates to a construction method of artificial hole pile prefabricated protection wall.

Background technique

At present, large-diameter piles are generally constructed by manual digging. The general construction process of this method is to dig down 1-1.5m, and set up formwork to pour the retaining wall concrete. After the retaining wall concrete reaches a certain strength, the next step is excavated. In this cycle, only to the design pile length position, and then hoist the steel cage and pour concrete.

The above method has the following problems: (1) Every time a section is dug down, the retaining wall concrete must be poured. After the retaining wall concrete reaches a certain strength, the digging can continue, and the continuous excavation cannot be carried out, which affects the work efficiency; (2) Affected by the pouring of the retaining wall, this The diameter of the pile body constructed by this method is generally large in the upper part and small in the lower part, which wastes the concrete of the pile body and cannot give full play to the bearing capacity of the good soil layer at the bottom of the pile; (3) In the soft soil layer or the stratum in contact with water, the wall cannot be quickly protected, and the hole is easy to collapse. Cause construction accidents, ranging from affecting the construction period, increasing the cost, and causing casualties.

SUMMARY OF THE INVENTION

The invention provides a construction method for artificially digging a hole pile prefabricated protective wall, aiming at solving the problems existing in the prior art.

The present invention is achieved in this way, a construction method for artificially digging a hole pile prefabricated retaining wall, comprising the following steps:

S1. The prefabricated parts of the retaining wall section are prefabricated in the prefabrication factory. The prefabricated parts include standard blocks, adjacent blocks and packaging blocks. 2 to 4 of the standard blocks, 2 adjacent blocks and 1 packaging block are enclosed to form a retaining wall. A plurality of retaining wall rings are stacked in the axial direction to form a retaining wall segment, the adjacent retaining wall rings in each retaining wall segment are connected by bolts, and the circumferentially adjacent prefabricated parts in each retaining wall ring are connected and arranged by bolts There is a rubber water stop;

S2. Excavate the pile hole downward along the height direction of the pre-designed pile hole. When a pile hole section with a preset depth is dug, a retaining wall section is supported in the pile hole section, and a retaining wall section is installed in the first retaining wall section. After the section support is completed, inject cement slurry to increase the friction between the outer wall of the retaining wall section and the surrounding rock and soil mass, until the retaining wall supporting of the pre-designed pile hole depth is completed;

S3. Hoist the steel cage and pour concrete for the pile body.

Preferably, in step S2, when supporting an adjacent protective wall section below a protective wall section, a jack is used to lift the protective wall section below, and two adjacent protective wall sections are connected by bolts.

Preferably, the surface of the preform is brushed.

Preferably, the cement slurry is a mixture of fly ash, slag, steel slag or tailings, NaOH solution and water glass.

Compared with the prior art, the beneficial effects of the present invention are as follows: in the present invention, a method for constructing a prefabricated retaining wall of an artificial hole-digging pile of the present invention sequentially prefabricates the prefabricated parts of the retaining wall section in a prefabrication factory, and then downwards along the height direction of the pre-designed pile holes. Excavation of pile holes, every time a pile hole section with a preset depth is dug, a retaining wall section is supported in the pile hole section, and after the first retaining wall section is supported, cement slurry is injected to increase the retaining wall section The friction force between the outer wall and the surrounding rock and soil mass, until the supporting wall of the pre-designed pile hole depth is completed, and finally the reinforcement cage is hoisted, and the pile body concrete is poured.

Description of drawings

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

Fig. 2 is a top view of the retaining wall of the present invention.

3 is a cross-sectional view of the standard block of the present invention.

FIG. 4 is an enlarged schematic view of the details of the A part in FIG. 3

In the picture: 1-standard block, 11-grouting hole, 12-rubber waterstop, 13-cork liner, 2-adjacent block, 3-packaging block.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Example 1

Referring to Figures 1-4, this embodiment provides a technical solution: a method for constructing a prefabricated retaining wall for artificially digging piles, comprising the following steps:

S1. Prefabricate each prefabricated part of the retaining wall section in a prefabrication factory. Please refer to Figure 1-2, the prefab includes a standard block 1, an adjacent block 2, and an encapsulated block 3. 2 to 4 standard blocks 1, 2 adjoining 2 blocks and 1 encapsulated block 3 are enclosed to form a wall retaining ring. The retaining walls are stacked in the axial direction to form a retaining wall segment, and the adjacent retaining rings in each retaining wall segment are fixedly connected by bolts, that is, the abutting surfaces of the upper and lower adjacent retaining rings are fixed by bolting. Circumferentially adjacent preforms in each retaining ring are connected by bolts and are provided with rubber waterstops 12 . All standard blocks 1, adjoining blocks 2, and encapsulation blocks 3 are used as segments, and the adjacent segments are connected by curved bolts in the circumferential and longitudinal directions, and a waterproof structure can be provided as required. Rubber waterstop 12 and cork liner 13 at the gap between the sheets. The diameter of the retaining wall is 1.5m. The thickness of the segment is 30 cm.

Prefabricated segments can be made of ordinary concrete, waterproof concrete or recycled concrete. The inner and outer surfaces of the segment are roughened to increase the friction between the outer wall and the surrounding rock and soil mass and the bonding between the inner wall and the post-cast pile concrete. Grouting holes 11 are reserved for the segment, and the friction between the outer wall and the surrounding rock and soil mass can be increased by grouting, which not only realizes the self-stabilizing ability of each prefabricated retaining wall supported during the construction process, but also improves the pile side after the construction is completed. The friction resistance can increase the bearing capacity of the single pile.

S2. Excavate the pile hole downward along the height direction of the pre-designed pile hole. When a pile hole section with a preset depth is dug, a retaining wall section is supported in the pile hole section, and a retaining wall section is installed in the first retaining wall section. After the section support is completed, the cement slurry is injected until the retaining wall support of the pre-designed pile hole depth is completed. When supporting an adjacent protective wall section below a protective wall section, a jack is used to lift the protective wall section located below, and bolts are used to connect two adjacent protective wall sections.

Specifically: first excavate the first section of the pile hole section, then complete the support of the first section of the prefabricated retaining wall section, fix the bottom end of the retaining wall section, then carry out post-wall grouting, and then carry out the next generation of excavation, and at the same time lift the grouting Strength, the friction between the retaining wall and the surrounding soil can support its own weight. The bottom end of the first section of the protective wall is removed, and the second section of the prefabricated protective wall is supported, and the second section of protective wall is lifted by the jack at the bottom of the second section, and the top of the second section of protective wall and the bottom of the first section of protective wall are passed through the Leave the bolt holes for bolt connection, and then retain the state of the second section of the jack, first excavate the third section of the core soil, the third section of the core excavation is completed, the grouting strength increases after the second section of the wall, in the second section of the protective wall Under the action of friction with the surrounding soil and the hoisting of the first section of the protective wall, the grouting strength around the first section of protective wall is further improved, and the friction between the protective wall and the surrounding soil is further improved, and the bottom jack of the second section is withdrawn to complete. The third section of pile body is excavated, and the third section of retaining wall is supported, and this continues until the retaining wall is constructed to the designed depth of the pile bottom.

S3. Finally, the steel cage is hoisted, the concrete of the pile body is poured, and the construction of the man-made pile is completed.

Among them, the cement slurry used for grouting can use geopolymer cement with quick-setting properties. In this embodiment, the cement slurry is a mixture of fly ash, slag, and steel slag, so as to realize the resource utilization of solid waste. Geopolymer cement has a quick-setting effect, which is conducive to early formation of strength and improvement of construction speed; the second is the resource utilization of industrial waste, which is energy-saving, environmentally friendly and economical.

The present invention provides a method for constructing a prefabricated retaining wall of an artificial hole-digging pile. The prefabricated parts of the retaining wall section are sequentially prefabricated in a prefabricated factory, and the pile holes are excavated downward along the height direction of the pre-designed pile holes. When a pile hole section is used, a retaining wall section is supported in the pile hole section, and cement slurry is injected after the first retaining wall section is supported until the retaining wall supporting of the pre-designed pile hole depth is completed, and finally the reinforcement cage is hoisted. When pouring the concrete of the pile body, the present invention adopts the prefabricated segment method, which can realize the rapid support of the retaining wall, save the construction period, wide adaptability of the stratum, good waterproof effect of the rubber waterstop, and the thickness of the segment can be flexibly adjusted according to the construction requirements during prefabrication. Higher security.

Embodiment 2

The present embodiment provides a technical solution: a method for constructing a prefabricated retaining wall of artificial digging piles, comprising the following steps:

S1. Prefabricate each prefabricated part of the retaining wall section in a prefabrication factory. The prefab includes a standard block 1, an adjacent block 2 and an encapsulation block 3. 2 to 4 standard blocks 1, 2 adjoining 2 blocks and an encapsulation block 3 are enclosed to form a retaining ring, and multiple retaining rings are stacked in the axial direction. A retaining wall section is formed, and the adjacent retaining wall rings in each retaining wall section are fixedly connected by bolts, that is, the abutting surfaces of the upper and lower adjacent retaining wall rings are fixed by bolting. Circumferentially adjacent preforms in each retaining ring are connected by bolts and provided with a rubber waterstop 12 . All standard blocks 1, adjoining blocks 2, and encapsulation blocks 3 are used as segments, and the adjacent segments are connected by curved bolts in the circumferential and longitudinal directions, and a waterproof structure can be provided as required. Rubber waterstop 12 and cork liner 13 at the gap between the sheets. The diameter of the retaining wall is 1m. The thickness of the segment is 40 cm.

Prefabricated segments can be made of ordinary concrete, waterproof concrete or recycled concrete. The inner and outer surfaces of the segment are roughened to increase the friction between the outer wall and the surrounding rock and soil mass and the bonding between the inner wall and the post-cast pile concrete. Grouting holes 11 are reserved for the segment, and the friction between the outer wall and the surrounding rock and soil mass can be increased by grouting, which not only realizes the self-stabilizing ability of each prefabricated retaining wall supported during the construction process, but also improves the pile side after the construction is completed. The friction resistance can increase the bearing capacity of the single pile.

S2. Excavate the pile hole downward along the height direction of the pre-designed pile hole. When a pile hole section with a preset depth is dug, a retaining wall section is supported in the pile hole section, and a retaining wall section is installed in the first retaining wall section. After the section support is completed, the cement slurry is injected until the retaining wall support of the pre-designed pile hole depth is completed. When supporting an adjacent protective wall section below a protective wall section, a jack is used to lift the protective wall section located below, and bolts are used to connect two adjacent protective wall sections.

Specifically: first excavate the first section of the pile hole section, then complete the support of the first section of the prefabricated retaining wall section, fix the bottom end of the retaining wall section, then carry out post-wall grouting, and then carry out the next generation of excavation, and at the same time lift the grouting Strength, the friction between the retaining wall and the surrounding soil can support its own weight. The bottom end of the first section of the protective wall is removed, and the second section of the prefabricated protective wall is supported, and the second section of protective wall is lifted by the jack at the bottom of the second section, and the top of the second section of protective wall and the bottom of the first section of protective wall are passed through the Leave the bolt holes for bolt connection, and then retain the state of the second section of the jack, first excavate the third section of the core soil, the third section of the core excavation is completed, the grouting strength increases after the second section of the wall, in the second section of the protective wall Under the action of friction with the surrounding soil and the hoisting of the first section of the protective wall, the grouting strength around the first section of protective wall is further improved, and the friction between the protective wall and the surrounding soil is further improved, and the bottom jack of the second section is withdrawn to complete. The third section of pile body is excavated, and the third section of retaining wall is supported, and this continues until the retaining wall is constructed to the designed depth of the pile bottom.

S3. Finally, the steel cage is hoisted, the concrete of the pile body is poured, and the construction of the man-made pile is completed.

Among them, the cement slurry used for grouting can use geopolymer cement with quick-setting properties. In this embodiment, the cement slurry is a mixture of tailings, NaOH solution, and water glass, so as to realize the resource utilization of solid waste. Geopolymer cement has a quick-setting effect, which is conducive to early formation of strength and improvement of construction speed; the second is the resource utilization of industrial waste, which is energy-saving, environmentally friendly and economical.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (4)

1. A construction method for a prefabricated retaining wall of a manual hole digging pile is characterized by comprising the following steps: the method comprises the following steps:

s1, prefabricating each prefabricated member of a wall protecting section in a prefabricating factory, wherein each prefabricated member comprises a standard block, an adjacent block and a packaging block, 2-4 standard blocks, 2 adjacent blocks and 1 packaging block surround to form a wall protecting ring, a plurality of wall protecting rings are stacked in the axial direction to form a wall protecting section, adjacent wall protecting rings in each wall protecting section are fixedly connected through bolts, and circumferentially adjacent prefabricated members in each wall protecting ring are connected through bolts and provided with rubber water stop strips;

s2, excavating the pile hole downwards along the height direction of the preset pile hole, erecting a protecting wall section in the pile hole section when excavating a pile hole section with the preset depth, and injecting cement paste after the first protecting wall section is erected to increase the friction force between the outer wall of the protecting wall section and the surrounding rock-soil mass until the supporting of the protecting wall with the preset pile hole depth is completed;

and S3, hoisting the reinforcement cage, and pouring pile body concrete.

2. The construction method of the prefabricated dado of the manual dug pile as claimed in claim 1, wherein: in step S2, when an adjacent one of the retaining wall sections below one of the retaining wall sections is erected, the lower retaining wall section is lifted up by using a jack, and the adjacent two retaining wall sections are connected by using bolts.

3. The construction method of the prefabricated dado of the manual dug pile as claimed in claim 1, wherein: and the surface of the prefabricated member is subjected to napping treatment.

4. The construction method of the prefabricated dado of the manual dug pile as claimed in claim 1, wherein: the cement slurry is fly ash, slag, steel slag, or a mixture of tailings, NaOH solution and water glass.

Images