CN204491643U - The constructing structure that on a kind of raft plate, dewatering well is closed - Google Patents

Abstract

The utility model discloses a closed construction structure for a dewatering well on a raft, which comprises a steel hanging plate arranged above the water surface of the dewatering well, the steel hanging plate including a bottom plate matching the shape of the cross-section of the dewatering well. The circumferential direction of the bottom plate is fixed with a plurality of vertical steel bars at equal intervals, and the tops of the multiple vertical steel bars are bent outwards and welded to the main reinforcement of the raft, and the vertical steel bars are spaced apart from each other. A plurality of inner hoops are welded, and a circle of safety dense mesh is set along the circumference between the inner hoop at the bottom and the bottom plate, and a sealing material is filled between the bottom plate and the surface of the raft. The overall structure of the steel hanging slab is stable and simple. It has been verified by practice that the closed basement raft of this structure does not have water seepage and leakage, and the effect is good. It greatly increases the safety and reliability of the foundation pit construction and eliminates the need for routine The complex process of construction also ensures that the dewatering well is closed and impermeable.

Description

A closed construction structure for dewatering wells on rafts

technical field

The utility model relates to a closed structure, in particular to a closed construction structure of a precipitation well.

Background technique

In recent years, the rapid development of my country's construction industry and the continuous increase of super high-rise buildings in urban construction have put forward higher and stricter requirements for deep foundation pit engineering, not only to maintain the stability around the foundation pit, but also to meet the needs of the construction site. Therefore, during the construction process, in order to ensure that the construction of the basement raft slab will not be affected by the rising groundwater level, the precipitation well is often set on the raft slab under the conditions of the site around the foundation. For the inconvenience caused by the subsequent closure of the well, according to common construction practices, the water pump embedment method is usually used. The operation method is to keep the water pump continuously pumping water, and put the required mixed dry material into the well while pumping water. When the mixture is backfilled to 500mm below the wellhead, stop the water pump, cut off the power supply, quickly cut off the water pipe and cable, and then quickly use the mixture to fill the rest.

The Chinese patent with the patent number CN201120146835.X discloses "a closed structure for a dewatering well". The water-stop steel plate and the sealing steel plate fixed on the water outlet of the steel casing, the sealing steel plate is provided with a water outlet pipe, the water outlet pipe is provided with a shut-off valve, and the shut-off valve is located in the post-casting pit, Expansive concrete is poured in the post-pouring pit. When the structure is closed, the stop valve is locked, and then the expansive concrete is poured. This structure is mainly aimed at the structure with a post-pouring pit on the foundation floor, and its application conditions have certain limitations.

The Chinese patent with the patent number CN201220376656.X discloses "a closed structure of a dewatering well", which includes a steel casing fixed on the upper end sleeve of the dewatering well and bottom dry cement filled in the dewatering well step by step from bottom to top Section, graded crushed stone section, middle micro-expansion concrete section, upper dry cement section and top micro-expansion concrete section; between the top micro-expansion concrete section and the upper dry cement section is provided with the steel casing A welded steel plate; a water stop ring is welded on the outer circumference of the steel sleeve, and the water stop ring is welded to the main reinforcement in the base plate. Although this structure can achieve a good waterproof effect, the materials are complex, requiring special configuration of micro-expansion concrete that meets the mix ratio requirements and graded gravel that meets the permeability ratio, and the frequent replacement of materials during the construction process is not easy to operate, which is extremely difficult. prone to deviation. The steel casing in this structure needs to weld the steel plate between the top and the upper part. The welding space is small, it is not easy to operate, and it is easy to affect the welding quality, which will eventually lead to water seepage and water leakage in the closed dewatering well.

The Chinese patent with the patent number CN201320206191.8 discloses "a new closed structure for dewatering wells". The upper end of the fixed plate is fixedly connected with the outer wall of the steel casing, the outer side of the fixed plate and the lower water stop plate is set as a base cushion, and the base cushion and the fixed plate are laid with a waterproof sealing layer, and the waterproof sealing layer is always along the The outer wall of the steel casing is laid upwards, and the outer side of the waterproof sealing layer is laid with waterproof coiled material and water-proof steel plate in turn; the top of the steel casing is provided with a waterproof cushion and cover plate; the inside of the well pipe is set with gravel, and the inside of the steel casing is set with UEA concrete. This method seals the top of the dewatering well by using hard sealing measures such as waterproof coils and steel plates. There is no improvement in the internal filling, and there are no corresponding leak-proof and anti-seepage measures. As time goes by, water seepage still occurs on the foundation floor Phenomenon.

The Chinese patent No. 2014205188972 discloses "a quick plugging device for a dewatering well in a building basement", which includes a steel casing on the top of the dewatering well pipe. The top of the steel casing is a flange, and the flange is connected by bolts There is a steel cover plate, a rubber sealing gasket is set between the steel cover plate and the flange, a circle of water stop ring is set on the outer wall of the steel casing, and a steel base is provided at the lower part; the steel casing is embedded in the downwater well pipe, and the steel base sits on the The top of the dewatering well pipe is provided with a concrete horizontal side; the dewatering well pipe under the steel pipe casing is provided with a hanging bottom formwork, and the steel casing is filled with rapid hardening expansive concrete from the steel cover plate to the hanging bottom formwork; the reinforced concrete bottom plate A groove flush with the bottom surface of the flange is provided, a circle of expanded rubber waterstop is bonded on the side wall of the groove, and the groove is filled with post-cast concrete. The utility model has the advantages of simple structure, convenient and fast operation, and can quickly and tightly seal the dewatering well, and can ensure the integrity of the structure because it does not penetrate the bottom plate. The closed process of this structure is relatively complicated to operate, and the construction period is long; bolts are used to fix the connection, and the steel plate for sealing needs to be specially opened in the factory. When the number of closed precipitation wells is small, the cost and time are uneconomical; According to the requirements of the specification, the number of exposed threads after the initial screwing and final screwing of the bolts is 2-3. For this closed construction method of the dewatering well, the quality requirements for the construction site operation are relatively high, and it is difficult to inspect after the construction is completed, and steel plates are prone to appear. If the concrete is poured without fastening, water leakage and water seepage will occur.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art, and to provide a closed construction structure for a dewatering well on a raft that ensures no water seepage and water leakage.

The utility model relates to a closed construction structure for a dewatering well on a raft, which includes a steel hanging plate arranged above the water surface of the dewatering well, and the steel hanging plate includes a bottom plate that matches the cross-sectional shape of the dewatering well. A plurality of vertical steel bars are fixed at equal intervals in the circumferential direction of the bottom plate, and the tops of the multiple vertical steel bars are bent outwards and welded to the main reinforcement of the raft, and welded at intervals on the plurality of vertical steel bars. There are multiple inner hoops, and a circle of safety dense mesh is set along the circumference between the inner hoop at the bottom and the bottom plate, and a sealing material is filled between the bottom plate and the surface of the raft.

The beneficial effects of adopting the utility model are:

The overall structure of the steel hanging slab is stable and simple, and it is easy to manufacture on the construction site. The steel hanging slab formed from this is used as a support for pouring concrete on the dewatering well on the closed raft instead of the sealing measures of the high-pressure water pump and the suction pipe. The reliable supporting function solves the problem that the water seepage cannot be solved after the dewatering well is closed in the past. It has been verified by practice that the closed basement raft of this structure does not cause water seepage and water leakage, and the effect is good, which greatly increases the safety and reliability of foundation pit construction, not only eliminates the complicated process of conventional construction, but also ensures that the dewatering well is closed. Seepage.

Description of drawings

Fig. 1 is the structural representation of the closed construction structure of a dewatering well on a raft plate of the present invention;

Fig. 2 is a schematic diagram of the installation structure of the steel hanging plate in the closed construction structure of the dewatering well on a raft plate of the present invention;

Fig. 3 is a structural schematic diagram of a steel hanging plate in a construction structure of a closed dewatering well on a raft of the present invention.

Detailed ways

The following will clearly and completely describe the technical solution of the utility model in combination with the accompanying drawings in the embodiment of the utility model.

The utility model relates to a closed construction structure for a dewatering well on a raft, which includes a steel hanging plate arranged above the water surface of the dewatering well, and the steel hanging plate includes a bottom plate 1 adapted to the cross-sectional shape of the dewatering well. The circumferential direction equidistant fixing of described base plate 1 has multiple vertical reinforcing bars 2, as shown in the figure, can be 3. The tops of the multiple vertical steel bars are bent outwards and welded to the main reinforcement of the raft, and multiple inner hoops 3 are welded at intervals on the multiple vertical steel bars, which are located between the bottom inner hoop and the bottom plate 1 A week of safety dense mesh 4 is set along the circumferential direction, which prevents the closed concrete from scattering. A plugging material 6 is filled between the bottom plate and the raft surface 5 .

Preferably, the bottom plate of the steel hanging plate is kept at 3.5m-4.5m above the water surface in the well. On the one hand, an appropriate growth height is reserved for the groundwater 9 in the dewatering well, so as to ensure that there is relatively sufficient time to install the steel hanging plate in the dewatering well after the water pump stops pumping; on the other hand, the steel hanging plate device has a sufficient length to ensure The concrete in the steel hanging slab has sufficient height to ensure that no water seepage occurs in the closed dewatering well.

Preferably, the distance between the bottom inner hoop and the bottom plate 1 is 180-200 mm. Using this inner hoop at a reasonable position, a dense mesh safety net is arranged at the bottom of the steel hanging slab along the circumference to reduce the loss of fine aggregate and cement slurry when pouring concrete in the steel hanging slab and ensure the strength of the concrete.

The construction steps of adopting this structure are:

First, under the normal working condition of the dewatering well, cut the excess part of the raft surface 5 at the height of the outer pipe 7 of the dewatering well, remove the raft concrete around the outer pipe of the dewatering well, expose the raft steel bars, and connect the three vertical steel bars of the steel hanging plate with the raft. Plate main rib 8 welding connection. And remove the high-pressure water pump and water pipe in time within the effective time, and ensure timely installation within 5 minutes.

Closure of the dewatering well: the speed of installing the steel hanging slab should be fast. First, the multiple vertical steel bars 2 and the main reinforcement of the raft slab are temporarily bound with wires, and the first section of concrete is poured in time, and then the plugging king is filled, and the multiple vertical steel bars 2 Welding with the main reinforcement of the raft, and pouring the second section of concrete at the same time, the whole process time is controlled within 20 minutes, and the closure of the raft dewatering well is completed after the end.

The above description is a preferred embodiment of the utility model, and is not intended to limit the utility model in any form. For any content that does not deviate from the technical solution of the utility model, any simple changes made to the above embodiments according to the technical essence of the utility model Modifications, equivalent changes and modifications all still belong to the scope of the technical solution of the present utility model.

Claims (3)

1. the closed construction structure of the dewatering well on a raft, is characterized in that: it comprises the steel hanger plate that is arranged on the water surface of the dewatering well, and described steel hanger plate comprises the bottom plate that matches with the dewatering well cross-sectional shape, A plurality of vertical reinforcing bars are fixed at equal intervals in the circumferential direction of the base plate, and the tops of the plurality of vertical reinforcing bars are bent outwards and welded to the main reinforcement of the raft, and on the plurality of vertical reinforcing bars A plurality of inner hoops are welded at intervals, and a circle of safety dense mesh is arranged between the bottom inner hoop and the bottom plate along the circumference, and a sealing material is filled between the bottom plate and the raft surface. 2. The closed construction structure of the dewatering well on the raft according to claim 1, characterized in that: the bottom plate of the steel hanging plate is kept at 3.5m-4.5m above the water surface in the well. 3. The closed construction structure of the dewatering well on the raft according to claim 1 or 2, characterized in that the distance between the inner hoop at the bottom and the bottom plate is 180-200 mm.