CN109024640A - One kind closing water valve device, shut-in well structure and its construction method - Google Patents

Abstract

One kind closing water valve device, shut-in well structure and its construction method, wherein closing water valve device includes necking down casing, the flange ring flat-plate of nozzle and sequentially connected waterproof pad and blank flange, necking down casing includes the enlarged diameter section of lower part and the reduced diameter section on top, and the two communicates and middle overlapping of axles.Specifically shut-in well construction method includes the following steps: to test dewatering well size, water level and pump-out, and water valve well-sealing device and self prime pump are closed in production；Water valve device is closed in installation, and enlarged diameter section is located at design water level absolute altitude, and reduced diameter section connects self prime pump by water pipe；It constructs in dewatering well hull-borne to waterproof protective layer, reinforced bar engineering etc.；It carries out necking down casing inner concrete to close water and use waterproof pad and blank flange sealing orifice, finally completes the construction of sole plate layer.The present invention can safely and effectively carry out closing trapped well, easy to operate and bottom plate engineering construction can be completed under dewatering well hull-borne, save the construction time.

Description

A water shut-off valve device, well sealing structure and construction method thereof

technical field

The invention relates to the field of civil engineering construction, in particular to a water closing valve device, a well sealing structure and a construction method thereof.

Background technique

In building construction, there are more and more deep foundation pit projects and drainage projects. For areas with large foundation pit area and depth and relatively rich groundwater, drainage is only carried out through the scheme of arranging dewatering wells around the periphery. Not only the cost of engineering measures is high, but many Under the circumstances, the demand for precipitation can no longer be met. In engineering dewatering, it is more and more common to install dewatering wells inside the core areas of buildings and foundation pits, but the safety of closing water and sealing wells is often poor when setting dewatering wells inside, which can easily affect the quality of the project. Therefore, in order to meet the construction progress and quality requirements of the project, it is necessary to provide a device and construction method for effectively draining water from the dewatering well and safely closing the water to seal the well.

Contents of the invention

The present invention proposes a water closing valve device, a well sealing structure and a construction method thereof, through the water closing valve device's dewatering measures and closed water sealing process, it is used to solve the problem of high water output without affecting the construction progress of the upper part of the dewatering well, which is safe and effective The problem of shutting water and sealing wells.

Concrete technical scheme of the present invention is:

A shut-off valve device includes a necking sleeve, a flange ring plate welded on the mouth of the necking sleeve, and a waterproof rubber pad and a flange blind plate connected to the flange ring plate in turn; the necking sleeve It includes a lower large-diameter section and an upper small-diameter section, the large-diameter section and the small-diameter section communicate with each other, and their central axes coincide.

The transition shoulder of the large diameter section and the small diameter section is a horizontal section or an inclined section, and the transition shoulder of the necking casing is higher than the head of the dewatering well.

The necking casing of the shut-off valve device is arranged at the upper end of the dewatering well, leaving a gap with the well wall of the dewatering well, and the top of the dewatering well and the surrounding of the necking casing are arranged in sequence with a foundation cushion, a waterproof layer, a waterproof protective layer and base floor layer.

The size of the gap between the necking casing and the well wall of the dewatering well is 50-100 mm, the bottom layer in the gap is made of linseed, and the remaining gap is filled with dry hard waterproof concrete.

The base cushion is flush with or 10-30mm lower than the transition shoulder of the large-diameter section.

The base cushion and the large-diameter section are joined by a mortar arc and the cushion, and the waterproof closure is closed on the small-diameter section.

The waterproof layer is laid along the surface of the base cushion and the mortar, and the upper part of the small-diameter section is closed.

Bottom plate steel bars are poured into the foundation bottom plate layer, the steel bar skeleton of the bottom plate is a mesh structure, and the grid spacing is greater than the outer diameter of the small diameter section.

The construction method of described sealing well structure, concrete steps are as follows:

Step 1. Measure the size of the precipitation well, determine the water level and water volume;

Step 2. Determine the size of the necking sleeve device, the head of the self-priming water pump (8) and the water pumping capacity based on the above test data;

Step 3. Install the necking sleeve, where the top of the large diameter section is installed at the design water level position in the dewatering well, and use linoleum to seal the bottom and fill the gap between the inner wall of the dewatering well and the shut-off valve device;

Step 4. The waterproof rubber pad and the flange blind plate are in the open state, and the nozzle of the small diameter section is connected to the self-priming water pump through the water pipe;

Step 5. Use the self-priming water pump to pump water outside the construction work surface. Under the drainage state of the dewatering well, carry out the foundation cushion, the mortar arc and the cushion in sequence, the waterproof layer, the closed waterproof mouth, the waterproof protective layer and the bottom plate. construction of steel bars;

Step 6. After completing the construction of the bottom slab reinforcement, perform concrete pouring on the foundation floor layer, and stop pouring when the pouring is below the elevation of the nozzle of the necking sleeve;

Step 7, take out the water pipe connected to the self-priming water pump, and fill concrete into the dewatering well from the necking sleeve;

Step 8: After the necking sleeve is filled with concrete, the nozzle bolts on the flange ring plate are connected with a waterproof rubber pad and a flange blind plate to seal the well with water.

Compared with existing devices and methods, the present invention has the following beneficial effects:

The present invention improves and perfects the water-closing device of the conventional dewatering well. Through the diameter-changing measure of the necking casing, the dewatering well can be effectively drained through the upper small-diameter section, and can be drained through the lower large-diameter section. The airtight filling with the dewatering well avoids potential quality hazards caused by damage to the buoyancy of the groundwater, and the sealing quality of the dewatering well is effectively improved by pouring concrete seals to avoid hidden dangers of floor leakage. The device of the invention is easy to install, the method is easy to operate, does not affect the engineering construction of the waterproof layer, the waterproof protective layer, and the base floor layer, thereby improving work efficiency and saving construction costs.

Description of drawings

Fig. 1 is a structural diagram of a shut-off valve device;

Figure 2 is a schematic diagram of the installation of the shut-off valve device and the precipitation;

Fig. 3 is a schematic diagram of the connection between the arc of the mortar and the cushion;

Fig. 4 is the construction diagram of waterproof layer, protective layer and reinforcing bar;

Fig. 5 is a schematic diagram of floor concrete pouring and rapid well closure;

Fig. 6 is a schematic diagram of the structure of the flange ring plate.

Reference signs: 1-neck sleeve; 2-large diameter section; 3-small diameter section; 4-flange ring plate; 5-waterproof rubber pad; 6-flange blind plate; 7-bolt; 8-automatic Suction pump; 9-water pipe; 10-wall of dewatering well; 11-linseed oil; 12-dry hard waterproof concrete; 13-foundation cushion; 14-mortar; 15-waterproof layer; 16-waterproof protective layer; 17- Pad block; 18-bottom plate reinforcement; 19-foundation bottom plate layer; 20-bolt hole.

Detailed ways

As shown in Fig. 1 and Fig. 6, a shut-off valve device, well sealing structure and construction method thereof, the shut-off valve device includes a necking sleeve 1 and a flange ring plate welded to the mouth of the necking sleeve 1 4. The flange ring plate 4 is connected with the waterproof rubber pad 5 and the flange blind plate 6 in turn through the bolt 7; the necking sleeve 1 includes the lower large diameter section 2 and the small diameter section 3 welded at the top of the large diameter section 2, The bottom end of the large-diameter section 2 is open, the large-diameter section 2 and the small-diameter section 3 communicate with each other, and their central axes coincide.

Among them, the necking sleeve 1 is made of steel, and the diameter of the large diameter section 2 is 300-500mm; the diameter of the small diameter section 3 is smaller than the grid size of the steel bar 18 of the bottom plate, and the diameter is 100-200mm; the wall thickness of the necking sleeve 1 is 6-12mm , the material grade is Q235 or Q345. The large-diameter section 2 is 450-1200mm long, and the small-diameter section 3 is 300-500mm long; the flange ring plate 4 and the flange blind plate 6 have the same specifications and materials as the necking sleeve 1, and the waterproof rubber pad 5 has a thickness of 4mm .

Bolt 7 specifications adopt large hexagonal ordinary bolts with a diameter of 8 to 14mm; flange ring plate 4, waterproof rubber pad 5, and flange blind plate 6 are provided with four bolt holes 20 facing the cross. The aperture positions correspond to the aperture ratios adopted. The diameter of the bolt 7 is 2-5mm larger; the distance between the center of the bolt hole 20 and the outer wall of the necking sleeve 1 and the edge of the flange ring plate 4 should be ≥ 25mm. The specifications and dimensions of the above-mentioned components are all convenient implementation descriptions, and are not limited thereto, and can be adjusted according to actual implementation conditions.

In order to meet the requirements of foundation construction for dewatering, and at the same time ensure the safe and effective sealing of dewatering wells and improve the quality of well sealing, the main application steps are: 1) Based on the general situation of the implementation project, the size of the dewatering well and the groundwater condition, design the water closing valve The size of the device specifications determines the number of required shut-off valve devices and the amount of supporting equipment such as self-priming water pumps 8 and water pipes 9.

2) As shown in Figure 2, install and fix the shut-off valve device to ensure that the height of the top of the large-diameter section 2 is flush with the foundation cushion 13 or slightly higher by 10-30mm, and that the distance between the large-diameter section 2 and the well wall 10 of the dewatering well is Use linoleum 11 for the back cover, and the remaining space after the back cover is sealed with dry hard waterproof concrete 12; the waterproof rubber pad 5 and the flange blind plate 6 are in an open state, and the self-priming water pump 8 is used to connect the small diameter section 3 through the water pipe 9, and the water in the dewatering well groundwater for drainage.

3) As shown in Figure 3, under the dewatering state of the dewatering well, the construction of the floor cushion is completed, and the joint between the bottom plate and the necking sleeve 1 is made into a circular arc with mortar 14 to connect with the cushion, and the small diameter section 3 is waterproofed The details of the work are handled, and the reception is carried out smoothly.

4) As shown in Figure 4, under the drainage state of the dewatering well, carry out the construction of the bottom plate on the upper part of the dewatering well and around the small-diameter section 3, first lay the waterproof layer 15 and the waterproof protective layer 16 on the upper part of the cushion, and then carry out the reinforcement of the bottom plate 18 binding, between the bottom plate steel bar 18 and the waterproof protective layer 16, cushion block 17 is installed.

5) As shown in Figure 5, complete the construction of the steel bar 18 on the bottom plate, and pour the concrete after passing the acceptance. When the overall pouring height of the concrete will reach the top elevation of the nozzle of the necking sleeve 1, take out the water pumping pipe 9 and fill it into the sleeve Concrete, close the water until it is filled; then fix the waterproof rubber pad 5 and the flange blind plate 6 on the flange ring plate 4 with bolts 7, complete the well sealing operation, and continue to pour concrete for the base plate until the base plate layer is completed 19 Construction.

Apparently, the above-mentioned embodiments are only explanations for clearly illustrating the outstanding features of the present invention, rather than limiting the implementation of the present invention; for those skilled in the art, it is still possible to make Other changes or changes in different forms, if no creative improvement is made to it, all belong to the protection scope of the present invention.

Claims (9)

1. one kind closes water valve device, it is characterised in that: including necking down casing (1), be welded on the flange ring of necking down casing (1) nozzle Plate (4) and the waterproof pad (5) and blank flange (6) being connected in turn on flange ring flat-plate (4)；

The necking down casing (1) includes the enlarged diameter section (2) of lower part and the reduced diameter section (3) on top, enlarged diameter section (2) and small straight Both diameter sections (3) communicate and middle overlapping of axles.

2. according to claim 1 close water valve device, it is characterised in that: the enlarged diameter section (2) and reduced diameter section (3) Transition shoulder is horizontal segment or tilting section, and the transition shoulder of necking down casing (1) is higher than dewatering well well head.

3. a kind of using the shut-in well structure of any of claims 1 or 2 for closing water valve device, it is characterised in that: described to close water valve dress The upper end of dewatering well is arranged in the necking down casing (1) set, with the dewatering well borehole wall (10) there are gap, at the top of the dewatering well, Necking down casing (1) surrounding has been sequentially arranged blinding layer (13), waterproof layer (15), waterproof protective layer (16) and sole plate layer (19).

4. shut-in well structure according to claim 3, it is characterised in that: the necking down casing (1) and the dewatering well borehole wall (10) Between void size be 50~100mm, bottom is spunyarn (11) in gap, and remaining gap is filled with dry water-proof concrete (12).

5. shut-in well structure according to claim 3, it is characterised in that: the blinding layer (13) and enlarged diameter section (2) mistake Shoulder position is crossed to flush or low 10~30mm.

6. shut-in well structure according to claim 3, it is characterised in that: the blinding layer (13) and enlarged diameter section (2) are handed over Position is connect using mortar (14) circular arc and bed course drop-over, is closed up in reduced diameter section (3) closure waterproof.

7. shut-in well structure according to claim 3, it is characterised in that: the waterproof layer (15) is along blinding layer (13) and sand (14) surface is starched to be laid with and be bonded closing on reduced diameter section (3) top.

8. shut-in well structure according to claim 3, it is characterised in that: poured Bottom Board Steel in the sole plate layer (19) Muscle (18), baseplate reinforcing bar (18) skeleton is reticular structure, and grid spacing is greater than reduced diameter section (3) overall diameter.

9. a kind of construction method of shut-in well structure as claimed in claim 8, which is characterized in that specific step is as follows:

Step 1: measurement dewatering well size, determines water level face and water；

Step 2: determining necking down casing (1) plant bulk, self prime pump (8) lift and pump-out based on above-mentioned test data；

Step 3: installation necking down casing (1), is wherein mounted on design water level position in dewatering well at the top of enlarged diameter section (2), utilize Spunyarn (11) back cover simultaneously fills dewatering well inner wall and closes gap between water valve device；

Step 4: waterproof pad (5) and blank flange (6) are in an open state, reduced diameter section (3) nozzle is connected by water pipe (9) Self prime pump (8)；

Step 5: being drawn water other than operation side using self prime pump (8), under dewatering well hull-borne, successively Carry out blinding layer (13), mortar (14) circular arc and bed course drop-over, waterproof layer (15), the closing in of closure waterproof, waterproof protective layer (16) and the construction of baseplate reinforcing bar (18)；

Step 6: carrying out sole plate layer (19) concreting after completing baseplate reinforcing bar (18) construction, pouring to necking down casing (1) below nozzle absolute altitude when, stop pouring；

Step 7: the water pipe (9) of connection self prime pump (8) is taken out, from necking down casing (1) fill concrete into dewatering well；

Step 8: after filling up concrete in necking down casing, in flange ring flat-plate (4) upper orifice bolt (7) connection waterproof pad (5) and Blank flange (6) carries out closing trapped well.