CN217758900U - Open caisson structure suitable for medium and coarse sand stratum - Google Patents

Abstract

The utility model relates to a open caisson structure suitable for well coarse sand stratum. The utility model provides a during open caisson construction, open caisson below silt flows into the open caisson structure that is applicable to well coarse sand stratum in the open caisson under the rivers effect, is applicable to open caisson engineering construction field. The utility model adopts the technical proposal that: the utility model provides a caisson structure suitable for well coarse sand stratum has the heavy well bore, and caisson bobbin base portion is equipped with caisson sword foot, its characterized in that: evenly be equipped with a plurality of vertical reinforcing bars of arranging along caisson barrel axial direction in caisson barrel bottom along caisson barrel circumferential direction, in the open caisson sword foot was gone into to one end anchor of vertical reinforcing bar, fixed mounting forms reinforcing bar group at the vertical reinforcing bar under the caisson barrel, and it is equipped with a plurality of hoop reinforcing bars to be equipped with along reinforcing bar group axial direction outside reinforcing bar group, and the hoop reinforcing bar of suit outside reinforcing bar group forms the steel reinforcement cage with reinforcing bar group, and the parcel has the breakwater on the lateral wall of steel reinforcement cage.

Description

Open caisson structure suitable for medium and coarse sand stratum

Technical Field

The utility model relates to a open caisson structure suitable for well coarse sand stratum. The method is suitable for the field of open caisson engineering construction.

Background

At present, in the engineering field, for a sunk well blade foot, a trapezoid reinforced concrete structure with a wide upper part and a narrow lower part is mostly used, and the principle is that an inclined sharp part at the lower end of a well wall in a sunk well structure is utilized for cutting soil and sinking. The soil-cutting machine can cut soil bodies in common soil layers and help the open caisson to sink. However, for the medium coarse sand stratum with higher underground water level, in the process of digging soil from the inside of the well to the outside when the open caisson sinks, the medium coarse sand around the well can flow into the well under the driving of water flow, so that the soil body around the well sinks, and the sinking of the open caisson is blocked.

The common processing mode in engineering field is for executing around the open caisson and beat round high pressure jet grouting pile in order to consolidate the soil body, prevents that sand and soil from gushing into in the well under the drive of rivers, and is effectual though, but high pressure jet grouting pile construction cycle is longer, and the expense is great, and economic nature and suitability all have certain problem.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: in order to solve the technical problem, the utility model provides a during open caisson construction, open caisson below silt flows into the open caisson structure that is applicable to well coarse sand stratum in the open caisson under the rivers effect.

The utility model adopts the technical proposal that: the utility model provides a caisson structure suitable for well coarse sand stratum has the heavy pit shaft, and caisson bobbin base portion is equipped with open caisson sword foot, its characterized in that: evenly be equipped with a plurality of vertical reinforcing bars of arranging along caisson barrel axial direction in caisson barrel bottom along caisson barrel circumference direction, in the caisson sword foot was gone into to one end anchor of vertical reinforcing bar, fixed mounting forms the reinforcing bar group at the vertical reinforcing bar under the caisson barrel, and the hoop reinforcing bar and the reinforcing bar group formation steel bar cage of suit outside the reinforcing bar group along reinforcing bar group axial direction cover are equipped with a plurality of hoop reinforcing bars outside the reinforcing bar group, and the parcel has the breakwater on the lateral wall of steel bar cage. So, sink at the open caisson and outwards dig the in-process in the well, the breakwater can completely cut off the coarse sand in the open caisson below outside the breakwater, avoids the peripheral well coarse sand of well to gush into in the open caisson under the drive of rivers for the soil body sinks around the well, causes the open caisson to sink obstructed. When digging to the underground water level below, the sand baffle below the cutting edge foot isolates external river sand and underground water, so that the condition of how much sand is dug outwards in the well and how much sand is gushed into the well from the outside of the well bottom is prevented, and the open caisson is guaranteed to sink smoothly.

The water baffle is an iron sheet baffle, a thin steel plate or waterproof geotextile.

The utility model has the advantages that: the utility model adds the water retaining and sand blocking plate consisting of the reinforcing steel bars and the water retaining plate on the basis of the traditional concrete blade leg, has simple structure, low cost and convenient installation, and can effectively shorten the construction period; compare in the construction of high-pressure jet grouting pile simultaneously in the work progress, the utility model discloses no raise dust, no waste water, noiselessness to when having avoided the installation high-pressure jet grouting pile the problem of the required extra construction space of reinforcement measure construction.

Drawings

FIG. 1: the structure of the utility model is schematically shown.

FIGS. 2-6: the utility model discloses well heavy pit shaft's construction flow chart.

FIG. 7: the utility model discloses well open caisson sinks into the schematic diagram on ground.

In the figure: 1. sinking shaft, 2, vertical reinforcing steel bar, 3, hoop reinforcing steel bar, 4, breakwater.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

As shown in fig. 1, the present embodiment is a caisson structure suitable for medium-coarse sand formation, and has a caisson shaft 1, and a caisson blade is arranged at the bottom of the caisson shaft 1, and is used for cutting soil under the action of the blade and the dead weight of the upper caisson in the process of digging soil from inside to outside of the well in the sinking of the caisson, so that the caisson shaft 1 sinks.

In this embodiment, in 1 bottom of caisson section of thick bamboo, fixed mounting has a plurality of along 1 circumference of caisson section of thick bamboo arrange the reinforcing bar group of 2 constitutions of vertical reinforcing bar in 1 bottom of caisson section of thick bamboo, and every vertical reinforcing bar 2 in this reinforcing bar group all arranges in 1 bottom of caisson section of thick bamboo along 1 axial direction of caisson section of thick bamboo. The external steel bar group is equipped with a plurality of hoop reinforcing bars 3 along the axial direction cover of steel bar group, and the hoop reinforcing bar 3 of suit outside the steel bar group forms the steel reinforcement cage with the steel bar group, and in this embodiment, the steel bar group outside of 1 bottom department of open caisson section of thick bamboo is equipped with an annular dowel, is equipped with an annular dowel in the bottom of steel bar group, and intermediate position department between two annular dowel still is equipped with an annular dowel. So, the steel reinforcement cage structure is more stable. And the outer side wall of the steel reinforcement cage is wrapped with an iron sheet baffle, a thin steel plate or waterproof geotextile. So, sink the construction, outwards dig the soil in-process in the well from the open caisson, the steel reinforcement cage can separate the well coarse sand of the inside and outside both sides in open caisson 1 below, avoids the open caisson when sinking, and the well coarse sand in the open caisson outside is gushed into in the open caisson under the effect of rivers for the soil body sinks around the well, causes the open caisson to sink obstructed.

As shown in fig. 2 to 6, in this embodiment, the method for installing the open caisson structure suitable for the medium-coarse sand formation includes:

digging a working pit with the depth of 0.8m on the bottom surface of the sinking well, wherein the radius of the bottom of the working pit is 0.5m more than that of the well dredging body of the sinking well, and the slope surface of the working pit is divided into a plurality of sections according to the slope ratio of 1:1.5 slope relief;

arranging a circumferential reinforcing steel bar 3 made of reinforcing steel bars at the bottom of the working pit, wherein the circumferential reinforcing steel bar 3 is consistent with the outer surface of the bottom of the sinking well shaft 1, arranging vertical reinforcing steel bars 2 with the length of 1.1m on the ground of the working pit along the circumferential reinforcing steel bar 3 at intervals of 0.5m, forming a reinforcing steel bar group by the vertical reinforcing steel bars 2 arranged on the bottom surface of the working pit, and welding each vertical reinforcing steel bar 2 with the circumferential reinforcing steel bar 3 arranged on the bottom surface of the working pit;

circumferential steel bars 3 are fixedly welded outside the steel bar groups at the positions 0.4m and 0.8m away from the bottom of the working pit respectively, wherein the uppermost circumferential steel bar 3 is parallel to the ground; iron sheet baffles, thin steel plates or waterproof geotextiles are fixedly paved on the outer side surfaces of the steel bar groups;

backfilling the working pit, and leveling and tamping the backfilled foundation;

erecting a template, binding steel bars and pouring concrete at the positions of the steel bar groups exposed out of the ground to manufacture the open caisson body, so that the vertical steel bars 2 and the annular steel bars 3 are fixedly connected with the open caisson body;

and (3) excavating the sandy soil in the sinking shaft 1, cutting the sandy soil below the blade foot of the sinking well under the action of self gravity, synchronously cutting the sandy soil to sink by the water baffle 4 and the reinforcing steel bar group at the lower part of the blade foot and the sinking well, and isolating the sandy soil outside the lower part of the sinking shaft 1 outside the sinking shaft 1.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (2)

1. The utility model provides a caisson structure suitable for well coarse sand stratum has the heavy pit shaft, and caisson bobbin base portion is equipped with open caisson sword foot, its characterized in that: evenly be equipped with a plurality of vertical reinforcing bars of arranging along caisson barrel axial direction in caisson barrel bottom along caisson barrel circumference direction, in the caisson sword foot was gone into to one end anchor of vertical reinforcing bar, fixed mounting forms reinforcing bar group at the vertical reinforcing bar under the caisson barrel, and outside reinforcing bar group along reinforcing bar group axial direction cover be equipped with a plurality of hoop reinforcing bars, the hoop reinforcing bar of suit outside reinforcing bar group and reinforcing bar group form the steel reinforcement cage, and the parcel has the breakwater on the lateral wall of steel reinforcement cage.

2. The open caisson structure applicable to medium and coarse sand formation according to claim 1, wherein: the water baffle is an iron sheet baffle, a thin steel plate or waterproof geotextile.

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