CN216515570U - Combined sand retaining wall protection structure of manual hole digging pile - Google Patents
Combined sand retaining wall protection structure of manual hole digging pile Download PDFInfo
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- CN216515570U CN216515570U CN202123109177.XU CN202123109177U CN216515570U CN 216515570 U CN216515570 U CN 216515570U CN 202123109177 U CN202123109177 U CN 202123109177U CN 216515570 U CN216515570 U CN 216515570U
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Abstract
The utility model discloses a combined sand retaining wall structure of a manual hole digging pile, which comprises a plurality of wall units for layer-by-layer excavation construction, wherein each wall unit is in a circular truncated cone shape with a small upper part and a large lower part; each wall protection unit comprises an inner template and an outer template, a wall protection reinforcement cage is bound between the inner template and the outer template of each wall protection unit, a concrete wall protection is poured between the inner template and the outer template of each wall protection unit, and the wall protection reinforcement cage is formed by binding longitudinal main reinforcements and circumferential stirrups; the outer mold comprises a circle of longitudinal supports which are uniformly distributed along the circumferential direction, the longitudinal supports are formed by arranging longitudinal steel bars and longitudinal bamboo strips at intervals, a plurality of annular bamboo hoops are sleeved outside the circle of longitudinal supports, the annular bamboo hoops and the sleeved longitudinal supports are bound into a framework of the outer mold through iron wires, and hemp ropes for blocking sand are wound outside the framework. The combined sand blocking protective wall structure can shorten the setting time of the sand blocking outer mold in each layer of pile hole, thereby reducing the hole collapse risk.
Description
Technical Field
The utility model relates to the technical field of pile foundation construction of civil engineering, in particular to a combined sand blocking retaining wall structure for constructing an artificial bored pile in a sandy soil foundation containing underground water.
Background
The manual hole digging pile is a reinforced concrete pile which is manually dug and poured on site. The pile diameter of the manual hole digging pile is thick, and the diameter of the thinnest pile can exceed 800mm, so that the manual hole digging pile can bear a structural main body with few floors and high pressure, and is more generally applied.
When the manual hole digging pile is constructed in a sandy soil foundation with abundant underground water, the traditional construction mode is that a full-length steel pile casing is combined with a submersible pump to reduce water and drain water so as to form a hole, namely the steel pile casing is inserted into a soil body and sinks to the elevation of the bottom of the pile to play a wall protecting role, then the pile is dug to the elevation of the bottom of the pile by manpower, water in a pile hole is pumped out and then is put into a reinforcement cage, and concrete is poured and tamped to form the pile. The traditional construction method has two defects. Firstly, because the diameter of the manual hole digging pile is large and deep, namely the diameter of the steel pile casing is large and long, and the side frictional resistance of the sandy soil is large, the steel pile casing is difficult to press down to the bottom of the pile to set the elevation, and the operation difficulty is large; and secondly, because the steel casing is thick and long and has large side frictional resistance, the steel casing cannot be pulled out after concrete materials are poured, so that the steel casing is retained in the soil body, the engineering cost of the manual hole digging pile is greatly increased, and the economical efficiency is poor.
In order to overcome the defects of the traditional construction mode, in recent years, the manual hole digging pile is constructed by adopting a method of excavating layer by layer and arranging a sand blocking protective wall layer by layer in the industry. For example, in the construction method of the patent with the application number of 200810070391.9, after a soil body with a certain height is dug, a circle of supporting pile sheets is inserted in an annular direction, a net-shaped curtain woven by hemp ropes and straw ropes is wound around the circle of supporting pile sheets, then the supporting pile sheets and the net-shaped curtain are used as outer molds, a circle of inner formworks are built, and then a layer of concrete dado is cast and tamped before the outer molds and the inner formworks; or, as the construction method of patent application No. 201510549600.8, after digging a certain height soil body, inserting a circle of steel bar in the ring direction, winding hemp rope or straw rope on the steel bar in a crossing way to form an external mold, then setting up an internal mold plate, and pouring and tamping the concrete dado between the external mold and the internal mold plate. The method does not need to insert a through long steel casing, is more convenient to operate and saves cost. However, the construction process of layer-by-layer excavation has the same disadvantages. After a certain distance is excavated, a circle of a plurality of supporting pile pieces or vertical steel bars are required to be temporarily inserted into a pile hole in site, and hemp ropes or straw ropes and the like for temporarily winding the retaining wall are also required to be temporarily inserted into the pile hole, so that the temporary insertion and winding can increase the field operation steps and prolong the construction period, and more importantly, the time for temporarily setting up the sand-blocking retaining wall can be delayed, so that the unsupported exposure time of soil on the side wall of the pile hole is too long, and particularly in a sandy soil layer with abundant underground water, during the process of inserting, supporting and winding the hemp ropes by workers, the soil on the wall of the hole which is not shielded and supported can collapse; in addition, the netted curtain made of ropes such as hemp ropes wound outside the supporting piles or the vertical steel bars has large holes, and the sand blocking and wall protecting waterproof effect is not good.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a combined sand blocking retaining wall structure of a manual hole digging pile, which can shorten the setting time of a sand blocking outer mold in each layer of pile holes so as to reduce the risk of hole collapse.
The technical scheme of the utility model is that the combined sand blocking retaining wall structure of the manual hole digging pile comprises a plurality of retaining wall units which are excavated layer by layer, wherein each retaining wall unit is in a circular truncated cone shape with a small upper part and a big lower part; each wall protection unit comprises an inner template and an outer template, a wall protection reinforcement cage is bound between the inner template and the outer template of each wall protection unit, a concrete wall protection is poured between the inner template and the outer template of each wall protection unit, and the wall protection reinforcement cage is formed by binding longitudinal main reinforcements and circumferential stirrups; the outer mold comprises a circle of longitudinal supports which are uniformly distributed along the circumferential direction, the longitudinal supports are formed by arranging longitudinal steel bars and longitudinal bamboo strips at intervals, a plurality of annular bamboo hoops are sleeved outside the circle of longitudinal supports, the annular bamboo hoops and the sleeved longitudinal supports are bound into a framework of the outer mold through iron wires, and hemp ropes for blocking sand are wound outside the framework.
Compared with the prior art, the combined sand blocking retaining wall structure of the manual hole digging pile with the structure has the following advantages.
The construction process of the manual hole digging pile with the combined sand blocking and protecting wall structure comprises the following steps of before excavation, binding a framework with an annular bamboo hoop and a longitudinal support outside a hole, and winding hemp ropes to form an integral outer mold; excavating layer by layer, and synchronously constructing a layer of combined sand blocking and protecting wall structure by excavating a layer of pile holes; specifically, after a layer of circular truncated cone-shaped pile hole with a small upper part and a large lower part is dug, an outer mold prefabricated outside the hole is hoisted into the hole to serve as an external temporary supporting structure to prevent the collapse of the hole wall of sandy soil, a wall protection reinforcement cage is bound on the inner side of the outer mold, then a circle of inner mold plate consisting of a cylindrical mold plate and an annular square wood ridge is erected, a concrete retaining wall is cast between the inner mold plate and the outer mold, the inner mold plate is removed after the concrete retaining wall is hardened, and at the moment, the concrete retaining wall of the inner ring and the outer mold of the outer ring form a circular truncated cone-shaped combined sand retaining wall structure with a small upper part and a large lower part of the pile hole; and continuously digging a next layer of circular truncated cone-shaped pile hole, and constructing a next layer of circular truncated cone-shaped combined sand retaining wall protecting structure by the same steps until the designed elevation of the pile bottom is reached.
The construction process is combined for analysis, and the framework of the outer mold is formed by binding the longitudinal bamboo strips, the longitudinal steel bars and the annular bamboo hoops, the longitudinal steel bars ensure that the framework has basic strength, and the longitudinal bamboo strips and the annular bamboo hoops ensure that the framework has certain elasticity and compression deformation; therefore, the outer die can be used as an external temporary support to bear and resist soil side pressure to prevent collapse, hemp ropes can be bound in advance and wound in the site ground or factory buildings to form an outer die before hole digging, and after circular truncated cone-shaped pile holes with small upper parts and large lower parts are dug layer by layer in place, the outer die prefabricated outside the holes is hoisted into the pile holes integrally; the outer die has elasticity, so that the outer die can be compressed in a small amplitude to pass through the minimum opening at the upper part of the pile hole and smoothly enter the circular truncated cone-shaped pile hole; therefore, the temporary supporting structure for the side wall of the pile hole is built quickly, the operation is convenient, the construction speed is high, the construction period is shortened, more importantly, the unsupported exposure time of the soil body on the side wall of the pile hole is reduced, and the hole collapse probability is reduced.
Preferably, the hemp rope is one, the hemp rope is continuously wound outside the framework circle by circle, and the hemp ropes of adjacent circles are close to each other; therefore, the hemp ropes are continuously wound on the outer circumference of the framework side by side, and two adjacent circles of hemp ropes are wound to be fine, compact and compact, the gap is small, and the waterproof sand-blocking effect is ideal. Moreover, the advantages are derived based on the advantage that the outer mold is integrally prefabricated outside the hole, and the hemp rope is pre-wound outside the hole, so that sufficient time is provided for winding the hemp rope in a sufficient and delicate manner, the hemp rope is wound compactly and finely, the winding in the hole is not required to be promoted on site, the unsupported exposure time of the soil body on the pile side is naturally not concerned to be prolonged due to the overlong winding time, and the waterproof effect of the sand blocking protection wall of the outer mold is further ensured.
Preferably, the lower end of the longitudinal main rib of each retaining wall unit extends out of the concrete retaining wall of the retaining wall unit, and the lower end of the longitudinal main rib of the retaining wall unit is in lap joint with the upper end of the longitudinal main rib of the retaining wall unit at the next layer; therefore, the connecting effect of two layers of concrete retaining walls which are adjacent up and down can be enhanced, and the structural integrity of the combined sand retaining wall is improved; after the lower ends of the longitudinal main ribs are extended, the installation of the outer die of the next layer cannot be disturbed, because the outer die has elasticity and compression allowance, the outer die of the next layer is compressed to enable the outer die to cross the upper opening of the circular truncated cone-shaped pile hole of the next layer to enter the pile hole of the next layer, the outer die is continuously pressed downwards to enable the outer die to be lower than the lower end of the longitudinal main rib of the previous layer, and therefore the radial outward expansion process of the outer die of the next layer cannot be blocked by the longitudinal main rib of the previous layer until the outer die of the next layer is completely expanded to cross the lower end of the longitudinal main rib of the previous layer along the transverse direction, the outer die of the next layer is not pressed downwards any more, the outer die of the next layer rebounds along the height direction, and the outer die of the circular truncated cone-shaped pile hole of the next layer is installed in place.
Preferably, the lower end of the longitudinal main rib of each retaining wall unit is screwed with an internal thread sleeve, and the lower opening of the internal thread sleeve is flush with the bottom end of the concrete retaining wall of the retaining wall unit; the lower opening of the internal thread sleeve is screwed with a connecting reinforcing steel bar, and the connecting reinforcing steel bar is mutually lapped with the upper end of the longitudinal main bar of the next layer of the retaining wall unit; therefore, the structure can also meet the connecting effect of two layers of concrete retaining walls which are adjacent up and down, and the integrity of the combined sand retaining wall structure is improved; and the assembly process of the structure is more convenient, after the outer die of the next layer is completely expanded and is filled into the round table-shaped pile hole of the next layer, the plug of the lower opening of each internal thread sleeve of the wall protection unit of the previous layer is pulled out, then the connecting reinforcing steel bar is screwed into the lower opening of each internal thread sleeve of the wall protection unit of the previous layer, then the wall protection reinforcing steel bar cage of the next layer is built, and the connecting reinforcing steel bar is mutually overlapped with the upper end of the longitudinal main rib of the wall protection unit of the next layer, so that the operation does not need to press down the outer die of the next layer like the previous embodiment, and the problem that the outer expansion of the outer die of the next layer is shielded by the lower end of the longitudinal main rib of the previous layer is avoided.
Drawings
Fig. 1 is a structural view illustrating a combined type sand retaining and retaining wall structure of a retaining wall unit of an artificial bored pile according to the present invention.
Fig. 2 is a schematic view of the exploded structure of fig. 1.
Fig. 3 is a side sectional view schematically showing the structure of the combined sand blocking and protecting wall structure of the artificial bored pile according to embodiment 1 of the present invention.
Fig. 4 is an enlarged schematic view of a portion a of fig. 3.
Fig. 5 is a side sectional view schematically showing the structure of the combined sand blocking and protecting wall structure of the artificial bored pile according to embodiment 2 of the present invention.
Fig. 6 is an enlarged structural view of a portion B in fig. 5.
The concrete wall-protecting formwork comprises 1 inner formwork, 1.1 cylindrical formwork, 1.2 annular square wood ribs, 2 wall-protecting reinforcement cages, 2.1 longitudinal main reinforcements, 2.2 annular stirrups, 3 concrete wall-protecting reinforcements, 4 longitudinal reinforcements, 5 longitudinal bamboo battens, 6 annular bamboo hoops, 7 frameworks, 8 hemp ropes, 9 internal thread sleeves, 10 connecting reinforcements.
Detailed Description
The utility model is further described with reference to the following figures and specific examples.
As shown in fig. 1 to 4, an embodiment 1 of the combined sand retaining and retaining wall structure of the manual bored pile according to the present invention includes a plurality of wall units constructed by excavation layer by layer, each wall unit having a circular truncated cone shape with a small top and a large bottom.
Each wall protection unit comprises an inner formwork 1 and an outer formwork, and the inner formwork 1 of each wall protection unit consists of a circle of cylindrical formwork 1.1 and a ring-shaped square wood ridge 1.2. And a retaining wall reinforcement cage 2 is bound between the inner template 1 and the outer mold of each retaining wall unit, a concrete retaining wall 3 is poured, and the retaining wall reinforcement cage 2 is formed by binding a longitudinal main reinforcement 2.1 and a circumferential stirrup 2.2.
The outer mold of each wall protection unit comprises a circle of longitudinal supports which are uniformly distributed along the circumferential direction, the longitudinal supports are formed by arranging longitudinal steel bars 4 and longitudinal bamboo strips 5 at intervals, a plurality of annular bamboo hoops 6 are sleeved outside the circle of longitudinal supports, each annular bamboo hoop 6 and each longitudinal support sleeved by the annular bamboo hoop 6 are bound into a framework 7 of the outer mold through iron wires, and hemp ropes 8 for blocking sand are wound outside the framework 7.
The hemp rope 8 is one, the hemp rope 8 is continuously wound outside the framework 7 circle by circle, and the hemp ropes 8 of adjacent circles are close to each other.
The lower end of the longitudinal main rib 2.1 of each retaining wall unit extends out of the concrete retaining wall 3 of the retaining wall unit, and the lower end of the longitudinal main rib 2.1 of the retaining wall unit is mutually lapped with the upper end of the longitudinal main rib 2.1 of the retaining wall unit at the next layer.
As shown in fig. 5 and 6, the embodiment 2 of the combined sand-blocking retaining wall structure of the artificial bored pile of the present invention is different from the previous embodiment in that the lower end of the longitudinal main rib 2.1 of each retaining wall unit does not extend out of the concrete retaining wall 3, but an internal threaded sleeve 9 is screwed on the lower end of the longitudinal main rib 2.1 of each retaining wall unit, and the lower opening of the internal threaded sleeve 9 is flush with the bottom end of the concrete retaining wall 3 of the retaining wall unit; the lower opening of the internal thread sleeve 9 is screwed with a connecting reinforcing steel bar 10, and the connecting reinforcing steel bar 10 is mutually lapped with the upper end of the longitudinal main reinforcing steel bar 2.1 of the next layer of the wall protection unit.
Claims (4)
1. A combined sand blocking retaining wall structure of a manual hole digging pile comprises a plurality of retaining wall units which are excavated layer by layer, wherein each retaining wall unit is in a circular truncated cone shape with a small upper part and a big lower part; each wall protection unit comprises an inner template (1) and an outer mold, a wall protection reinforcement cage (2) is bound between the inner template (1) and the outer mold of each wall protection unit, a concrete wall protection (3) is poured, and the wall protection reinforcement cage (2) is formed by binding a longitudinal main reinforcement (2.1) and a circumferential stirrup (2.2); the method is characterized in that: the outer mold comprises a circle of longitudinal supports which are uniformly distributed along the circumferential direction, the longitudinal supports are formed by arranging longitudinal steel bars (4) and longitudinal bamboo strips (5) at intervals, a plurality of annular bamboo hoops (6) are sleeved outside the circle of longitudinal supports, each annular bamboo hoop (6) and each sleeved longitudinal support are bound into a framework (7) of the outer mold through iron wires, and hemp ropes (8) for blocking sand are wound outside the framework (7).
2. The combined type sand blocking retaining wall structure of the artificial dug pile according to claim 1, wherein: the hemp rope (8) is one, the hemp rope (8) is continuously wound outside the framework (7) circle by circle, and the hemp ropes (8) of adjacent circles are close to each other.
3. The combined type sand blocking retaining wall structure of the artificial dug pile according to claim 1, wherein: the lower end of the longitudinal main rib (2.1) of each retaining wall unit extends out of the concrete retaining wall (3) of the retaining wall unit, and the lower end of the longitudinal main rib (2.1) of the retaining wall unit is mutually lapped with the upper end of the longitudinal main rib (2.1) of the retaining wall unit at the next layer.
4. The combined type sand blocking retaining wall structure of the artificial dug pile according to claim 1, wherein: the lower end of the longitudinal main rib (2.1) of each retaining wall unit is screwed with an internal thread sleeve (9), and the lower opening of the internal thread sleeve (9) is flush with the bottom end of the concrete retaining wall (3) of the retaining wall unit; the lower opening of the internal thread sleeve (9) is screwed with a connection reinforcing steel bar (10), and the connection reinforcing steel bar (10) is mutually lapped with the upper end of the longitudinal main reinforcing steel bar (2.1) of the next layer of the wall protection unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123109177.XU CN216515570U (en) | 2021-12-10 | 2021-12-10 | Combined sand retaining wall protection structure of manual hole digging pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123109177.XU CN216515570U (en) | 2021-12-10 | 2021-12-10 | Combined sand retaining wall protection structure of manual hole digging pile |
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| CN216515570U true CN216515570U (en) | 2022-05-13 |
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| CN202123109177.XU Active CN216515570U (en) | 2021-12-10 | 2021-12-10 | Combined sand retaining wall protection structure of manual hole digging pile |
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