CN105040723A - Structure for preventing sand backfill and treating concrete pole up-pulling and construction method thereof - Google Patents

Abstract

The invention discloses an uplifting structure of a cement rod for sand prevention and backfill control and a construction method thereof. The structure comprises a cement rod, a fixed ring, a fixed stay wire, a fixed bottom plate and an annular fixed piece. The construction method includes: (1) digging a cement pole pit; (2) fixing the upper edge of the annular fixed piece with the bottom surface of the fixed bottom plate; (3) placing the integral body formed by the annular fixed piece and the fixed bottom plate (4) set a fixed ring on the cement rod; (5) erect the cement rod vertically in the cement rod pit; (6) install a fixed backguy; (7) place the The cement pole pit is leveled with backfill soil, compacted, and the construction is completed. The invention fundamentally solves the problem of pulling up cement rods caused by soil freezing in winter and thawing in summer in northern my country, and has simple structure, convenient construction, low cost of materials used, and short construction period, which greatly reduces the annual cost of pulling up cement rods. The cost of repair and maintenance required for the problem.

Description

A kind of uplifting structure and construction method of cement poles for anti-sand soil backfill treatment

Technical field:

The invention relates to a structure for preventing cement rods from pulling up and a construction method thereof, in particular to a structure for preventing sand backfilling and controlling cement rods from pulling up and a construction method thereof.

Background technique:

In most areas of northern my country, the soil freezes in winter and thaws in summer, which leads to periodic uplifts of some cement poles on transmission lines, with an average maximum uplift of 16cm per year, and tilting and downturning of cement poles in some areas , which seriously threatens the safe operation of the line. Frost heaving of the soil is the prerequisite for the uplift of the cement pole, and after the uplift occurs, the unfrozen mud, water, and sand around the cement pole root will fall into the cavity to fill the cavity, so that the pole root cannot fall back to the original place after thawing in the second year. It is the root cause of the cumulative uplifting of cement poles and eventually the downturning of the poles.

At present, there are mainly three types of measures to prevent cement poles from being pulled up in our country. The most basic ones are pulling wires, straightening, and soil reinforcement. These methods need to be carried out every year, and require a lot of manpower, material resources, and financial resources. The second category mainly starts from the treatment of pole foundation soil, based on eliminating or weakening the three basic factors that cause frost heave (soil with frost heave sensitivity, certain water supply, suitable freezing conditions and time), and adopts drainage and water isolation , Coarse sand replacement, and quicklime piles are used to treat the cement pole foundation. This kind of method has a huge amount of engineering, and the frost heave effect is not durable. Another type of method aims to enhance the resistance of cement poles and adapt to freeze-thaw deformation, including the use of deep piles, expanded foundations, and isolation methods. This type of method enhances the uplift resistance of cement poles, but the disadvantage is that uplifting cannot be avoided. The unfrozen muddy water and gravel around the root fall into the cavity. Once the cement rod is pulled up, it is difficult to fall back to the original position, resulting in cumulative uplifting, which does not fundamentally solve the problem of cement rod pulling up.

Invention content:

It is an urgent requirement to solve the problem of cement pole uplift of power transmission lines in frost heaving areas to propose a method for controlling cement pole uplift that is convenient for construction, saves overall cost, enhances uplift resistance of the shaft, and prevents sandy soil backfilling.

The first object of the present invention is to provide an anti-sand soil backfill control cement rod uplift structure.

The second object of the present invention is to provide a construction method for preventing sand backfilling and controlling the uplifting structure of cement rods.

The first object of the present invention is implemented by the following technical scheme, a kind of anti-sand soil backfill control cement rod pull-up structure, which includes cement rods, fixed rings, fixed stay wires, fixed bottom plates and ring-shaped fixed pieces, and the bottom of the fixed bottom plate is provided There is the annular fixed piece, the upper edge of the annular fixed piece is fixedly connected with the bottom surface of the fixed bottom plate, the cement rod is vertically arranged above the fixed bottom plate, and the bottom end of the cement rod is fixed on the On the top surface of the fixed base plate, a fixed ring is set above the cement rod, and several tensioned fixed stay wires are arranged between the fixed ring and the fixed base plate, and one end of the fixed stay wire is connected to the fixed base plate The other end is connected to the fixed ring, the fixed ring is located above the ground surface, and the cement rod, the fixed bottom plate and the annular fixed piece under the fixed ring are all buried in the soil below the ground surface. layer.

Preferably, the fixing ring is a metal ring, the fixing pull wire is a metal wire, the fixing bottom plate is a stainless steel plate, the annular fixing sheet is an annular stainless steel sheet, and the lower edge of the annular stainless steel sheet is blade-shaped.

Specifically, the soil layer is divided into a frozen soil layer and an unfrozen soil layer, and the upper layer of the unfrozen soil layer is the frozen soil layer.

Preferably, both the fixed bottom plate and the annular fixed piece are embedded in the unfrozen soil layer.

Preferably, several fixed pull wires are evenly distributed.

The second object of the present invention is implemented by the following technical scheme, a construction method for preventing sand backfilling and controlling the structure of pulling up cement rods, which includes the following steps:

(1) Dig a cement rod pit at the position where the cement rod is buried, and the depth of the cement rod pit is greater than the thickness of the frozen soil layer;

(2) The upper edge of the annular fixed piece is fixedly connected with the bottom surface of the fixed bottom plate to form a whole; the structural design of the annular fixed piece and the fixed bottom plate can effectively prevent sand and soil from backfilling while increasing the resistance of pulling up, and eliminate the cement rod Occurrence of shaft pull-out problems.

(3) Put the integral body formed by the annular fixing piece and the fixing base plate into the bottom of the cement rod pit, and make the annular fixing piece vertically placed so that the fixing base plate forms a horizontal plane;

(4) Set a fixed ring on the cement rod, and fix the fixed ring on the cement rod;

(5) set up the cement rod vertically in the cement rod pit, and fix the bottom of the cement rod with the top surface of the fixed bottom plate together, at this time, the fixed ring is above the water level;

(6) Fix one end of several fixed stay wires on the edge of the fixed base plate at equal intervals respectively, and fix the other ends on the fixed ring at equal intervals respectively, and tighten the fixed stay wires;

(7) Leveling the cement rod pit with backfill, compacting, and completing the construction.

Preferably, the fixed ring is a metal ring, the fixed pull wire is a metal wire, the fixed bottom plate is a stainless steel plate, the annular fixed sheet is an annular stainless steel sheet, and the upper edge of the annular stainless steel sheet is in contact with the stainless steel plate The bottom surface is welded and connected, the steel bar at the bottom of the cement pole is welded and connected to the top surface of the stainless steel plate, and the two ends of the metal wire are respectively welded and connected to the metal ring and the stainless steel plate. The metal wire, metal ring and stainless steel plate are welded together to make the cement rod and the stainless steel plate integrated, increase the total load of the shaft, and increase the pull-out resistance of the shaft.

Preferably, the lower edge of the annular stainless steel sheet is blade-shaped and inserted into the soil at the bottom of the cement pole pit.

Description of the working principle: The weight of the stainless steel plate and the ring-shaped stainless steel plate increases the total load of the cement rod shaft, and at the same time increases the gravity of the adobe above the stainless steel plate and the downward compression frost heaving force of the permafrost layer above the stainless steel plate.

(1) When the thickness of the permafrost layer is small and the bonding force between the permafrost and the cement rod (freeze stability resistance) is not enough to overcome the total load of the rod body, the gravity of the adobe and the compressive frost heaving force, this method effectively prevents the cement rod from being pulled up. phenomenon occurs.

(2) When the thickness of the permafrost layer is large and the freezing stability resistance makes the cement rod shaft pull up a certain amount, a cavity is formed inside the annular stainless steel sheet, which can effectively prevent the surrounding unfrozen mud, water, sand and gravel from falling into the cavity After thawing in the second year, the annular stainless steel sheet is reinserted into the adobe below, the cavity disappears, and the cement rod shaft falls back to its original position, effectively preventing the cement rod shaft from being pulled out.

The advantages of the present invention are: 1. The method of the present invention only needs to excavate the adobe above the stainless steel plate during construction, and the engineering quantity is small, without large-scale construction, which greatly shortens the construction period and reduces the construction cost; The main raw material used in the pull-up structure is stainless steel with a certain weight, which is cheap and effectively controls the transformation cost; 3. When the thickness of the permafrost layer is small, the effect of preventing the pull-up of the cement rod is remarkable; 4. The thickness of the permafrost layer When it is larger, through the rising and falling of the ring-shaped stainless steel sheet and the anti-sand backfilling effect, it can effectively prevent the phenomenon of pulling out the cement pole; The problem of pulling up the rod is simple, the structure is simple, the construction is convenient, the cost of materials used is low, and the construction period is short, which greatly reduces the annual maintenance cost for solving the problem of pulling up the cement rod.

Description of drawings:

Fig. 1 is a schematic diagram of an uplifting structure of cement rods for anti-sand soil backfill treatment.

Concrete rod 1, metal ring 2, ground after frost heaving 3, original ground 4, frozen soil layer 5, metal wire 6, unfrozen soil layer 7, stainless steel plate 8, ring stainless steel sheet 9.

Detailed ways:

Embodiment 1: As shown in Figure 1, a kind of anti-sand soil backfill control cement rod uplifting structure, it comprises cement rod 1, metal ring 2, metal wire 6, stainless steel plate 8 and annular stainless steel sheet 9, the ring stainless steel sheet 9 The lower edge is blade-like. The bottom of the stainless steel plate 8 is provided with an annular stainless steel sheet 9, the upper edge of the annular stainless steel sheet 9 is welded to the bottom surface of the stainless steel plate 8, the cement rod 1 is vertically arranged above the stainless steel plate 8, and the bottom end of the cement rod 1 is fixed on the stainless steel plate On the top surface of 8, a metal ring 2 is sheathed above the cement rod 1, and several tensioned metal wires 6 are arranged between the metal ring 2 and the stainless steel plate 8, and several metal wires 6 are evenly distributed. One end of the metal wire 6 is welded to the edge of the stainless steel plate 8, and the other end is welded to the metal ring 2. The metal ring 2 is located above the ground surface, and the cement rod 1, the stainless steel plate 8 and the annular stainless steel sheet 9 below the metal ring 2 are buried. the soil layer below the surface. The soil layer is divided into a frozen soil layer 5 and an unfrozen soil layer 7 , and the upper layer of the unfrozen soil layer 7 is the frozen soil layer 5 . Both the stainless steel plate 8 and the annular stainless steel sheet 9 are buried in the unfrozen soil layer 7 .

After frost heaving occurs in the soil, the ground will rise to a certain extent, as shown in Figure 1, the ground 3 after frost heaving is higher than the original ground 4 .

Description of working principle: The weight of the stainless steel plate 8 and the annular stainless steel plate 9 increases the total load of the cement rod 1 shaft, and simultaneously increases the gravity of the adobe above the stainless steel plate 8 and the downward compressive frost heaving force of the permafrost above the stainless steel plate 8 .

(1) When the thickness of the permafrost layer 5 is small and the binding force (freeze stability resistance) between the permafrost layer 5 and the cement rod 1 is not enough to overcome the total load of the rod shaft, the gravity of the adobe and the compressive frost heaving force, this method effectively prevents the The generation of cement rod 1 pulling up phenomenon.

(2) When the thickness of the permafrost layer 5 is relatively large and the freezing stability resistance makes the shaft of the cement rod 1 pull up a certain amount, a cavity is formed inside the annular stainless steel sheet 9, which can effectively prevent the surrounding unfrozen mud, water, sand and gravel from falling into it. In the cavity, after thawing in the second year, the annular stainless steel sheet 9 is reinserted into the adobe below, the cavity disappears, and the shaft of the cement rod 1 falls back to the original place, effectively preventing the pulling out of the shaft of the cement rod 1 .

Embodiment 2: Embodiment 1 is a kind of construction method for preventing sand backfilling and controlling the construction of cement rod uplift structure, which includes the following steps:

(1) dig a cement rod pit at the buried cement rod 1 position, and the depth of the cement rod pit is greater than the thickness of the permafrost layer 5;

(2) The upper edge of the annular stainless steel sheet 9 is welded to the bottom surface of the stainless steel plate 8 to form a whole;

(3) The integral body formed by the annular stainless steel sheet 9 and the stainless steel plate 8 is put into the bottom of the cement rod pit, the lower edge of the annular stainless steel sheet 9 is blade-shaped, inserted in the soil at the bottom of the cement rod pit, and the annular stainless steel sheet 9 is vertical Place it so that the stainless steel plate 8 forms a horizontal plane;

(4) set the metal ring 2 on the cement rod 1, and fix the metal ring 2 on the cement rod 1;

(5) cement rod 1 is vertically erected in the cement rod pit, and the top surface of cement rod 1 bottom and stainless steel plate 8 is welded together, and at this moment, metal ring 2 is above the horizontal plane;

(6) Weld one ends of several metal wires 6 to the edge of the stainless steel plate 8 at equal intervals respectively, and weld the other ends to the metal ring 2 at equal intervals respectively, and tension the metal wires 6;

(7) Fill the cement pole pit with backfill soil, compact it, and complete the construction.

Claims (8)

1. a sand control earthen backfill is administered on cement pole and is pulled out structure, it is characterized in that, it comprises cement pole, retainer ring, fixing bracing wire, fixed base plate and annular stator, the below of described fixed base plate is provided with described annular stator, the top edge of described annular stator is fixedly connected with the bottom surface of described fixed base plate, described cement pole is vertically arranged at above described fixed base plate, and described cement pole bottom is fixed on the end face of described fixed base plate, retainer ring is arranged with above described cement pole, some fixing bracing wires of straining are provided with between described retainer ring and described fixed base plate, one end of described fixing bracing wire and the edge conjunction of described fixed base plate, the other end is connected with described retainer ring, described retainer ring is positioned at more than ground surface, described cement pole below described retainer ring, described fixed base plate and described annular stator are all embedded in the soil layer on below earth's surface.

2. a kind of sand control earthen backfill according to claim 1 is administered on cement pole and is pulled out structure, it is characterized in that, described retainer ring is metal ring, described fixing bracing wire is wire, described fixed base plate is corrosion resistant plate, described annular stator is ring stainless steel sheet, and the lower edge of described ring stainless steel sheet is blade-like.

3. a kind of sand control earthen backfill according to claim 1 is administered on cement pole and is pulled out structure, and it is characterized in that, described soil layer is divided into frozen soil layer and non-frozen soil layer, and the upper strata of described non-frozen soil layer is described frozen soil layer.

4. a kind of sand control earthen backfill according to claim 3 is administered on cement pole and is pulled out structure, it is characterized in that, non-frozen soil layer described in described fixed base plate and described annular stator are all embedded in.

5. a kind of sand control earthen backfill according to claim 1 is administered on cement pole and is pulled out structure, and it is characterized in that, some described fixing bracing wires are uniformly distributed.

6. a construction method of cement pole pulling out structure is administered in sand control earthen backfill, and it is characterized in that, it comprises the steps:

(1) bury underground cement pole position dig cement pole hole, cement pole hole the degree of depth be greater than frozen soil layer thickness;

(2) top edge of annular stator is fixedly connected with the bottom surface of fixed base plate, forms an entirety;

(3) entirety that described annular stator and described fixed base plate are formed is put into described cement pole and cheat bottom, and described annular stator is vertically placed, make described fixed base plate form a horizontal plane;

(4) sheathed retainer ring on cement pole, and described retainer ring is fixed on described cement pole;

(5) vertically established by described cement pole in described cement pole hole, be fixed together bottom described cement pole with the end face of described fixed base plate, now, described retainer ring is above water;

(6) be equidistantly fixed on respectively on the edge of described fixed base plate one end of some fixing bracing wires, the other end is equidistantly fixed on described retainer ring respectively, and will fix bracing wire tension;

(7) add flat by described cement pole hole backfill, compacting, completes construction.

7. the construction method of cement pole pulling out structure is administered in a kind of sand control earthen backfill according to claim 6, it is characterized in that, described retainer ring is metal ring, described fixing bracing wire is wire, described fixed base plate is corrosion resistant plate, described annular stator is ring stainless steel sheet, top edge and the described corrosion resistant plate bottom surface of described ring stainless steel sheet are welded to connect, the end face of described cement pole bottom reinforcement bars and described corrosion resistant plate is welded to connect, and the two ends of wire are welded to connect with described metal ring and described corrosion resistant plate respectively.

8. the construction method of cement pole pulling out structure is administered in a kind of sand control earthen backfill according to claim 7, and it is characterized in that, the lower limb of described ring stainless steel sheet is blade-like, inserts in the bottom soil body of described cement pole hole.