CN114108678B - Anchor rod static pressure pile construction method for reinforcing transformer substation foundation - Google Patents

Abstract

The invention discloses a construction method of an anchor rod static pressure pile for reinforcing a transformer substation foundation, and relates to the field of transformer substation foundation reinforcing methods. The number of the electric wires and the electrified equipment in the transformer substation is large, the large economic loss can be brought to the foundation reinforcement construction of the transformer substation when the power is cut off, and potential safety hazards are brought to the power grid. The invention reserves pile holes and pre-buried anchor rods when the transformer substation equipment foundation pile cap is constructed, a counterweight water tank is arranged on the foundation pile cap, a pressure sensor is arranged at the bottom of the water tank, a static pile press is installed after counterweight is injected, a pile is pressed in place by the static pile press, and finally, the pile holes are poured by C30 micro-expansion concrete, so that the pile and the foundation are firmly combined together, the pile can bear upper load, and the foundation reinforcement effect is achieved. According to the method, the water injection counterweight water tank is arranged on the foundation pile cap, so that the foundation pile cap is not arched in the pile pressing process, the normal operation of substation equipment in the static pile construction process can be effectively ensured, and the counterweight increase and decrease can be conveniently realized.

Description

Construction method of anchor static pressure pile for substation foundation reinforcement

technical field

The invention relates to the field of substation foundation reinforcement construction methods, in particular to a construction method of anchor static pressure piles for substation foundation reinforcement.

Background technique

During the substation expansion construction, there are many live wires and live equipment around, and the construction situation for substation foundation reinforcement becomes complicated. If the construction is interrupted, not only will the approval period be shorter, but it will also bring greater economic losses. Stability brings hidden dangers. In addition, the internal space of the substation is limited, and large construction equipment cannot enter, which brings inconvenience to construction.

The anchor static pressure pile construction technology can be easily applied to relatively small space foundation reinforcement. It has been widely used in old factories or for foundation reinforcement in ordinary building renovation projects. However, due to the large number of live equipment in the substation, it involves substation If there is a power grid failure due to construction in the power supply of the entire social area where it is located, it will cause great losses. During construction, the upward arch deformation of the foundation of a relatively small substation may cause power outages and equipment failures. malfunction and stop working.

Contents of the invention

The technical problem to be solved and the technical task proposed by the present invention are to perfect and improve the existing technical solutions, and to provide a construction method of anchor static pressure piles for substation foundation reinforcement, with the purpose of ensuring the normal operation of substation equipment during construction. For this reason, the present invention takes the following technical solutions.

A construction method of anchor static pressure piles for substation foundation reinforcement, comprising the following steps:

1) For substation equipment foundation cap construction, pile holes and pre-embedded anchors are reserved for each designed pile hole position;

2) Multiple water tanks are arranged on the foundation cap, and the distance between the water tank and each reserved pile hole is maintained for construction;

3) Arrange pressure sensors at the four corners and the center of the bottom of each water tank, and connect the pressure sensors to the terminal counterweight display device;

4) Inject water into the water tank as a counterweight to provide the pullout force required by the static pressure pile, so as to ensure that the foundation cap will not be arched during the pile pressing process;

5) Determine the length of the pile section according to the safe charging distance of live equipment and conductors;

6) Install the pile pressure reaction force frame through the pre-embedded anchor rod to complete the installation of the static pile machine;

7) After the pile section is hoisted in place, the static pressure is in place, and the depth and pressure value are recorded;

8) Add some pile sections according to the final design requirements, after the rear pile section is hoisted in place, it needs to be welded with the front pile section, and the water tank counterweight should be added as needed;

9) When the pile pressure reaches 1.5 times the design load of the pile, remove the static pile machine and weld the anchor bars on the top of the pile;

10) Pour the pile hole with C30 micro-expansion concrete, so that the pile and the foundation are firmly combined, and the pile can bear the upper load and achieve the effect of foundation reinforcement.

This method determines the length of the pile section according to the safe charging distance of the live equipment and wires in the substation, so as to ensure that the equipment will not be touched during the handling and hoisting process, and the safety is improved; by arranging multiple water injection counterweight water tanks on the foundation cap, it can be conveniently Increase the pressure on the foundation cap, ensure that the foundation cap does not arch during the pile pressing process, and ensure that the impact on the live equipment is avoided during the construction of the static pressure pile, which can effectively ensure the normal operation of the substation equipment during the construction of the static pressure pile. The arrangement of pressure sensors can conveniently realize the quantitative detection of the increase or decrease of the counterweight according to the progress of the construction, so as to facilitate the increase or decrease of the counterweight; the use of water as the counterweight is convenient and fast for adding and unloading, convenient for construction, and the increase of load is controllable. Can be reused.

As an optimal technical means: the water tank is made of rubber. Easy to carry, reusable, and low cost.

As an optimal technical means: the four corners of the foundation cap are arranged with the water tank, and the distance between the water tank and the reserved hole is not less than 1 meter. This position and distance can facilitate the static pressure pile construction operation.

As an optimal technical means: in step 4), when injecting water into the water tank, use a water pump connected to a transparent reticulated pipe to inject water, and the water source first uses groundwater generated by excavation of the foundation pit. Realize the effective use of on-site water resources and reduce costs.

As an optimal technical means: after the pile hole is poured with C30 micro-expansion concrete, the water in the water tank is used as concrete maintenance water. Realize the comprehensive utilization of water.

Beneficial effects: This method determines the length of the pile section according to the safe charging distance of live equipment and wires in the substation, so as to ensure that the equipment will not be touched during the handling and hoisting process, and the safety is improved; by arranging multiple water injection counterweight water tanks on the foundation cap It can easily increase the pressure on the foundation cap, ensure that the foundation cap does not arch during the pile pressing process, and ensure that the impact on the live equipment is avoided during the static pressure pile construction, and can effectively ensure the normal operation of the substation equipment during the static pressure pile construction. The pressure sensor is arranged at the bottom of the water tank, which can conveniently realize the quantitative detection of the increase or decrease of the counterweight according to the progress of the construction, so as to facilitate the increase or decrease of the counterweight; using water as the counterweight, the addition and unloading are convenient and quick, the construction is convenient, and the load can be increased. control and can be reused.

Description of drawings

Fig. 1 is a schematic flow chart of the present invention.

Fig. 2 is a schematic diagram of the distribution of pile holes and water tanks in the example of the present invention.

Fig. 3 is a working diagram of the static pile machine in the present invention.

In the figure: 1. Foundation cap; 2. Water tank; 3. Pile hole; 4. Static pile driver; 5. Anchor rod; 6. Pile section.

Detailed ways

The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1-3, a construction method of anchor static pressure piles for substation foundation reinforcement, the process includes the following steps:

S1: Construction of substation equipment foundation cap 1, reserve pile holes 3 and pre-embedded anchor rods 5 at each designed pile hole 3 position;

S2: Arrange the water tank 2 on the foundation cap 1, and keep the distance required for construction between the water tank 2 and each reserved pile hole 3;

S3: arrange pressure sensors at the four corners and the center of the bottom of each water tank 2, and connect the pressure sensors to the terminal counterweight display device;

S4: inject water into the water tank 2 as a counterweight to provide the pullout force required by the static pressure pile, and ensure that the foundation cap 1 will not be arched during the pile pressing process;

S5: Determine the length of pile section 6 according to the safe charging distance of live equipment and conductors;

S6: install the pile pressure reaction force frame through the pre-embedded anchor rod 5, and complete the installation of the static pile machine 4;

S7: After the pile section 6 is hoisted in place, the static pressure is in place, and the depth and pressure value are recorded;

S8: Add pressure piles according to the final design requirements. After hoisting the rear pile section 6 into place, it needs to be welded with the front pile section 6, and increase or decrease the counterweight of the water tank 2 as required;

S9: When the pile pressure reaches 1.5 times the design load of the pile, remove the static pile machine 4, and weld the anchor bars on the top of the pile;

S10: Pour the pile hole 3 with C30 micro-expansion concrete, so that the pile and the foundation are firmly combined, and the pile can bear the upper load and achieve the effect of foundation reinforcement.

For each stake hole 3, operate according to the process of the above steps S6 to S10.

As shown in Figure 2, the construction scope of the foundation cap 1 of this example includes the left pile hole area and the right pile hole area. The right pile holes are arranged in 4 vertically and horizontally, the pile spacing is 1.5 meters, and 4 water tanks are arranged. At the four corners of the right pile hole area, the distance between the water tank 2 and the pile hole 3 is 1 meter, and a water tank 2 is arranged in the middle of the right pile hole area, and the distance between the water tank 2 and the pile hole 3 is 1 meter. The pile hole area on the left is divided into 2 rows and 3 rows and 2 columns of pile holes 3, in which a water tank 2 is arranged between every 2 pile holes 3 in the left row, and 2 water tanks 2 are arranged in the right row, and the 2 water tanks 2 are separated by 2 piles The hole 3, the distance between the water tank 2 and the pile hole 3 are all 1 meter.

In this example, the water tank 2 is made of rubber. Easy to carry, not easy to be damaged by impact, reusable, and low cost.

In step S4, when filling water into the water tank 2, a water pump is used to connect the transparent reticulated pipe for water injection, and the water source is firstly groundwater generated by the excavation of the foundation pit. Realize the effective use of on-site water resources and reduce costs.

After the pile hole 3 is poured with C30 micro-expansion concrete, the water in the water tank 2 is used as concrete maintenance water. Realize the comprehensive utilization of water.

This method determines the length of the pile section 6 according to the safe charging distance of the live equipment and wires in the substation, so as to ensure that the equipment will not be touched during the handling and hoisting process, and the safety is improved; by arranging multiple water injection counterweight water tanks 2 on the foundation cap 1 It can easily increase the pressure on the foundation cap 1, ensure that the foundation cap 1 does not arch during the pile pressing process, ensure that the impact on the live equipment is avoided during the static pressure pile construction, and can effectively ensure the normal operation of the substation equipment during the static pressure pile construction. Operation, the pressure sensor is arranged at the bottom of the water tank 2, which can conveniently realize the quantitative detection of the increase or decrease of the counterweight according to the progress of the construction, so as to facilitate the increase or decrease of the counterweight; using water as the counterweight, the addition and unloading are convenient and quick, and the construction is convenient and convenient. The load increase is controllable and reusable.

The anchor static pressure pile construction method shown in the above Figures 1-3 is a specific embodiment of the present invention, which has demonstrated the outstanding substantive features and significant progress of the present invention, and can be used according to actual needs. Under the enlightenment of the present invention, equivalent modifications to it in terms of shape, structure, etc., all fall within the scope of protection of this proposal.

Claims (5)

1. A construction method of an anchor rod static pressure pile for reinforcing a transformer substation foundation is characterized by comprising the following steps:

1) Constructing a transformer substation equipment foundation pile cap (1), and reserving pile holes (3) and pre-buried anchor rods (5) at the positions of each designed pile hole (3);

2) A plurality of water tanks (2) are arranged on the foundation pile cap (1), and the water tanks (2) and each reserved pile hole (3) are kept with a space required by construction;

3) Pressure sensors are arranged at four corners and the center of the bottom of each water tank (2) and are connected to a terminal counterweight display device;

4) The water is injected into the water tank (2) to be used as a counterweight to provide the pulling resistance required by the static pile, so that the foundation pile cap (1) is prevented from arching in the pile pressing process;

5) Determining the length of the pile section (6) according to the safe charging distance of the charging equipment and the lead;

6) Installing a pile pressing reaction frame through an embedded anchor rod (5) to finish the installation of a static pile pressing machine (4);

7) Hoisting the pile section (6) in place, then carrying out static pressure in place, and recording depth and pressure values;

8) Adding a plurality of pile segments (6) according to the final design requirement, hoisting the rear pile segment (6) in place, welding with the front pile segment (6), and adding the counterweight of the water tank (2) according to the requirement;

9) When the pile pressing force reaches 1.5 times of the design load of the pile pressing, removing the static pile pressing machine (4), and welding anchor bars at the top of the pile pressing;

10 And (3) pouring pile holes (3) by using C30 micro-expansion concrete, so that the piles and the foundation are firmly combined together, the piles can bear upper load, and the foundation reinforcement effect is achieved.

2. The construction method of the anchor rod static pressure pile for reinforcing the foundation of the transformer substation according to claim 1, wherein the construction method comprises the following steps: the water tank (2) is made of rubber.

3. The construction method of the anchor rod static pressure pile for reinforcing the foundation of the transformer substation according to claim 1, wherein the construction method comprises the following steps: the four corners of the basic bearing platform (1) are provided with the water tank (2), and the distance between the water tank (2) and the reserved hole is not less than 1 meter.

4. The construction method of the anchor rod static pressure pile for reinforcing the foundation of the transformer substation according to claim 1, wherein the construction method comprises the following steps: in the step 4), a water pump is used for connecting a transparent reticulate pattern pipe for water injection when water is injected into the water tank (2), and the water source firstly adopts groundwater generated by excavation of a foundation pit.

5. The construction method of the anchor rod static pressure pile for reinforcing the foundation of the transformer substation according to claim 1, wherein the construction method comprises the following steps: and after the C30 micro-expansion concrete pouring pile hole (3) is finished, water in the water tank (2) is used as water for concrete curing.