CN204386602U - Pressure regulating well pit shaft cavity collapse backfill auxiliary structure - Google Patents

Abstract

The utility model provides a collapse cavity backfill auxiliary structure of a pressure regulating well shaft, which is arranged in the pressure regulating well shaft with a collapse cavity; the construction method comprises backfill aggregate, a reinforcing mesh, a pipe shed, a full-space scaffold and backfill concrete, wherein the backfill aggregate is laid at the bottom of a shaft of the surge shaft, the reinforcing mesh is laid in a projection area of a collapsed cavity on the backfill aggregate, the pipe shed is buried on the reinforcing mesh and is deep into the wall of the collapsed cavity, the backfill concrete is buried on the pipe shed, the full-space scaffold is wrapped inside the backfill concrete, and the top of the collapsed cavity is tightly attached to the full-space scaffold. By adopting the technical scheme, the collapse cavity of the shaft can be safely and quickly treated, the risk of collapse treatment is greatly reduced, and the collapse treatment method can be popularized and applied to collapse treatment of the surge shaft or other vertical caverns in hydropower engineering.

Description

An auxiliary structure for backfilling the collapsed cavity of a pressure regulating well

technical field

The utility model belongs to the technical field of water conservancy engineering construction, in particular to an auxiliary structure for backfilling the collapsed cavity of a surge well shaft.

Background technique

During the excavation of the wellbore of the surge well, the inner wall of the wellbore will easily collapse when affected by unfavorable factors such as rock fragmentation, fracture development, abundant groundwater, and blasting disturbance. Especially for surge wells with larger inner diameters and deeper depths, it is difficult and time-consuming to treat the cavities formed after landslides. In the prior art, the method for dealing with the landslide cavity is usually to backfill the cavity with concrete, etc., but since the bottom of the collapse cavity is usually an inclined plane inclined to the center of the wellbore, if the backfilling is carried out directly, the backfilled concrete will be difficult to stabilize itself and cannot correct the collapse. The rock mass at the top of the cavity plays a supporting role. When the slag in the wellbore is processed downward, there is a possibility of secondary landslide in the backfill concrete of the collapsed cavity, which threatens the stability of the entire wellbore and brings great hidden dangers to construction safety and construction schedule. Therefore, how to safely and quickly deal with the collapsed cavity and ensure the stability of the backfilled concrete in the collapsed cavity has become an urgent problem to be solved in construction, and determines the quality of the repair of the surge shaft collapse and the safety of the project during the construction period.

Utility model content

In order to solve the above-mentioned technical problems, the utility model provides an auxiliary structure for backfilling the collapsed cavity of a surge well, which can safely and quickly deal with the collapsed cavity of the wellbore and ensure the stability of the wellbore.

The utility model is realized through the following technical solutions.

The utility model provides an auxiliary structure for backfilling the collapsed cavity of a surge well shaft. The structure is arranged in the cavity of the surge well shaft; The material is laid at the bottom of the surge well shaft, and the reinforced mesh is laid on the projection area of the collapsed cavity on the backfilled aggregate. The pipe shed is buried on the reinforced mesh, and the pipe shed is deep into the wall of the collapsed cavity. The concrete interior is wrapped with a full-scale scaffolding that clings to the top of the collapse cavity.

The pipe shed is at least 5m deep into the wall of the collapse cavity.

It also includes anchor cables, which have multiple anchor cables, one end of the anchor cables is buried in the backfill concrete, and the other end goes deep into the wall of the collapsed cavity.

The anchor cable is at least 8m deep into the wall of the collapsed cavity

The beneficial effects of the utility model are:

1. By backfilling the aggregate in the wellbore of the surge well to a certain elevation, the bottom of the collapsed cavity can be quickly leveled;

2. By laying steel mesh on the leveling layer, the backfill concrete can be evenly acted on the backfill aggregate of the leveling layer;

3. By burying the pipe shed on the steel mesh, and the other end of the pipe shed goes deep into the rock body of the inner wall of the collapse cavity, not only can grouting fill the gap, cement the bottom of the collapse cavity and backfill the aggregate, but also implant steel bars and backfill concrete in the pipe shed. Improve the rigidity of the pipe shed and play a certain role in supporting the upper backfill;

4. Set up scaffolding or other steel supports on the steel mesh at the bottom of the collapse cavity, and then fill it with concrete, which will be more effective in supporting the rock mass at the top of the collapse cavity;

5. Through the reserved holes for the anchor cables led out in advance, the anchor cables can be conveniently arranged to reinforce the backfill concrete in the collapsed cavity.

Adopting the technical scheme can safely and quickly deal with the wellbore collapse cavity, greatly reducing the risk of landslide treatment, and can be popularized and applied in the treatment of hydropower engineering surge shafts or other vertical caverns.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1-Surge well shaft, 2-Collapse cavity, 3-Collapse slag, 4-Backfill aggregate, 5-Reinforcing mesh, 6-Pipe shed, 7-Mantang scaffolding, 8-Backfill concrete, 9-Anchor cable, 10-template.

Detailed ways

The technical solution of the utility model is further described below, but the scope of protection is not limited to the description.

As shown in Figure 1, an auxiliary structure for backfilling the cavity of a surge well shaft is set in the well shaft 1 of the surge well shaft of the collapse cavity 2; it includes backfilling aggregate 4, steel mesh 5, pipe shed 6, and scaffolding 7 And backfill concrete 8, wherein the backfill aggregate 4 is laid on the bottom of the surge well shaft 1, and the steel mesh 5 is laid on the projection area of the collapse cavity 2 on the backfill aggregate 4, and the pipe shed 6 is buried on the steel mesh 5, and the pipe shed 6 Going deep into the wall of the collapse cavity 2, the pipe shed 6 is filled with backfill concrete 8, and the inside of the backfill concrete 8 is wrapped with a full-scale scaffolding 7, which is close to the top of the collapse cavity 2; it also includes anchor cables 9, the There are many, and one end of the anchor cable 9 is buried in the backfill concrete 8, and the other end goes deep into the wall of the collapsed cavity 2.

During the excavation of the wellbore 1 of the surge well, a landslide occurs in the wellbore, forming a collapse cavity 2, and the collapsed slag body 3 accumulates in the excavated wellbore, forming an inclined surface; through backfilling the aggregate 4 in the wellbore, the backfill elevation is located in the collapse cavity The middle and lower part of 2 can quickly level the bottom of the collapsed cavity 2 without too much backfill, which increases the amount of later excavation; the shotcrete closes the collapsed cavity 2, and lays reinforcement mesh 5 on the backfill aggregate 4 at the bottom of the collapsed cavity 2. A pipe shed 6 is buried on the net 5, and the pipe shed 6 is at least 5m deep into the wall of the collapse cavity 2, preferably 5-10m; a full house scaffold 7 is erected on the steel mesh 5, and the scaffold 7 is close to the top of the collapse cavity 2; There are many deep anchor cables 9 on the wall of the collapse cavity 2, and the depth of the anchor cables 9 deep into the wall of the collapse cavity 2 is at least 8m, preferably 8-15m; a formwork 10 is erected outside the collapse cavity 2, and the backfill concrete 8 fills the entire cavity. Collapse cavity; grouting in the pipe shed 6 can cement the backfill aggregate into a whole. After grouting, implant 2 steel bars in the pipe shed 6 and fill it with grout; Anchor cable 9 is laid in cable hole position. The diameter of the pipe shed can be 108mm, and the diameter of the steel bar in the pipe shed can be 32mm. After the collapse cavity 2 is processed, the backfill aggregate 4 can be removed vertically with a crawler crane or a guide shaft, and the next step of construction can be carried out, which can effectively and quickly ensure the completion of the collapse cavity treatment.

Claims (4)

1. a surge shaft pit shaft collapses chamber backfill supplementary structure, this vibrational power flow is in the surge shaft pit shaft (1) of chamber of collapsing (2), it is characterized in that: comprise backfill aggregate (4), steel mesh reinforcement (5), pipe canopy (6), full hall scaffold (7) and fill concrete (8), wherein backfill the bottom that aggregate (4) is laid on surge shaft pit shaft (1), steel mesh reinforcement (5) is laid by backfill aggregate (4) the is collapsed view field in chamber (2), steel mesh reinforcement (5) is buried pipe canopy (6) underground, and pipe canopy (6) deeply collapses in the wall of chamber (2), the upper landfill of pipe canopy (6) has fill concrete (8), the internal package of fill concrete (8) has full hall scaffold (7), full hall scaffold (7) is close to the top of chamber of collapsing (2).

2. surge shaft pit shaft as claimed in claim 1 collapses chamber backfill supplementary structure, it is characterized in that: described pipe canopy (6) at least deeply collapse chamber (2) wall in 5m.

3. surge shaft pit shaft as claimed in claim 1 collapses chamber backfill supplementary structure, it is characterized in that: also comprise anchor cable (9), one end landfill of anchor cable (9) is in fill concrete (8), and the other end deeply collapses in chamber (2) wall.

4. surge shaft pit shaft as claimed in claim 3 collapses chamber backfill supplementary structure, it is characterized in that: described anchor cable (9) at least deeply collapse chamber (2) wall in 8m.