Multilayer shock absorption pile for water measurement platform
Technical Field
The invention belongs to the technical field of engineering measurement, and particularly relates to a multilayer damping pile for a water measurement platform.
Background
In recent years, urban traffic facility construction in China is rapidly developed, and an overwater measurement platform is required to be constructed in the process of carrying out overwater traffic construction. However, the water measuring platform is seriously affected by the impact of sea waves, so that the platform vibrates, and the precision is reduced. Affecting site construction, how to solve the problem that the water measuring platform is vibrated by sea waves is very important.
At present, the water platform mainly adopts a reinforced concrete pile foundation. The method mainly improves the strength of the concrete pile and reduces vibration by increasing the diameter of the concrete pile. However, the method needs to increase the diameter of the concrete pile, so that the construction cost of the water platform is increased, and the method can only rarely weaken the influence of vibration on the water measurement platform, and the increased diameter is not proportional to the weakened vibration. Therefore, the influence of vibration on the vibration of the water platform can not be well reduced by only increasing the diameter of the concrete pile.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the multilayer shock absorption pile for the water measurement platform, which has obvious shock absorption effect and meets the requirement of a measurement device on shock.
In order to solve the technical problems, the invention adopts the technical scheme that the lower end of the multilayer shock absorption pile for the water measurement platform is buried under a water layer and penetrates through a soft soil layer to a hard rock layer, and the upper end of the multilayer shock absorption pile is positioned on the water layer and used for supporting the measurement platform; the multi-layer shock absorption pile sequentially comprises a first layer of steel pipes, a second layer of steel pipes and a third layer of steel pipes which are sleeved together from an outer layer to an inner layer, wherein the bottoms of the first layer of steel pipes, the second layer of steel pipes and the third layer of steel pipes are flush; a filling space is formed between each two adjacent steel pipes; the lower section of the filling space between the first layer of steel pipes and the second layer of steel pipes, the lower section of the filling space between the second layer of steel pipes and the third layer of steel pipes and the inside of the third layer of steel pipes are poured with concrete; the upper section of the filling space between the first layer of steel pipes and the second layer of steel pipes is filled with fine sand, and the upper section of the space between the second layer of steel pipes and the third layer of steel pipes is filled with rubber.
Further, the upper ends of the concrete between the first layer steel pipe and the second layer steel pipe and between the second layer steel pipe and the third layer steel pipe are positioned at the junction between the soft soil layer and the hard rock layer.
Further, the steel pipes are coaxially sleeved, and the distance between every two adjacent steel pipes is 10 cm to 20cm.
Further, the heights of the first layer of steel pipes, the second layer of steel pipes and the third layer of steel pipes are sequentially increased, and the height difference between two adjacent steel pipes is 15-20cm.
Further, the concrete is super-retarding concrete, and the final setting time is not less than 48 hours.
The invention also discloses a shock-absorbing water measurement platform which comprises the plurality of multilayer shock-absorbing piles and a concrete platform, wherein the concrete platform is arranged at the upper parts of the plurality of multilayer shock-absorbing piles.
Further, the number of the multi-layer shock absorption piles is 4, and the multi-layer shock absorption piles are arranged in pairs in a horizontal row and a vertical column.
The invention also discloses a construction method of the multilayer shock absorption pile for the water measurement platform, which comprises the following steps:
drilling holes at the positions to be applied as damping piles, wherein the hole diameter is consistent with the diameter of the first layer of steel pipes;
step two, vertically placing a first layer of steel pipes in the drilled holes;
pouring super-retarding concrete in the first layer of steel pipes in the second step until the height reaches the junction between the soft soil layer and the hard rock layer;
sleeving a second layer of steel pipes in the first layer of steel pipes, and enabling the bottoms of the second layer of steel pipes to penetrate through the super-retarding concrete to reach the bottoms of the drill holes;
sleeving a third layer of steel pipe in the second layer of steel pipe, and enabling the bottom of the third layer of steel pipe to penetrate through the super-retarding concrete to reach the bottom of the drilled hole;
continuously pouring super-retarding concrete in the third layer of steel pipe until the super-retarding concrete reaches the top of the third layer of steel pipe;
step seven, filling rubber in the space between the second layer of steel pipes and the third layer of steel pipes until the space is filled to the top;
and step eight, filling fine sand between the first layer of steel pipes and the second layer of steel pipes until the fine sand is filled to the top.
Further, the method comprises the following steps:
step nine, repeating the steps one to eight to finish the construction of other multi-layer shock absorption piles;
and step ten, placing a measuring platform at the top of each multi-layer shock absorption pile.
The multilayer shock absorption pile for the water measurement platform has the following advantages: 1. the damping effect is obvious, and the requirement of the measuring device on vibration is met. 2. The diameter of the concrete pile can be effectively reduced, so that the cost is reduced.
Drawings
FIG. 1 is a schematic top view of a multilayer shock absorbing pile for a water-borne measurement platform according to the present invention.
FIG. 2 is a schematic side view of a shock absorbing and wind resistant offshore measurement platform in accordance with the present invention.
Wherein: 1. a first layer of steel pipes; 2. a second layer of steel pipes; 3. a third layer of steel pipes; 4. fine sand; 5. rubber; 6. concrete; 7. a measurement platform; A. a water layer; B. a soft soil layer; C. hard rock formations.
Detailed Description
The invention relates to a multilayer shock absorption pile for a water measurement platform, as shown in fig. 1 and 2, wherein the lower end of the multilayer shock absorption pile is buried under a water layer A, penetrates through a soft soil layer B to a hard rock layer C, and the upper end of the multilayer shock absorption pile is positioned on the water layer A and is used for supporting a measurement platform 7; the multilayer shock absorption pile sequentially comprises a first layer of steel pipes 1, a second layer of steel pipes 2 and a third layer of steel pipes 3 which are sleeved together from an outer layer to an inner layer, wherein the bottoms of the first layer of steel pipes 1, the second layer of steel pipes 2 and the third layer of steel pipes 3 are level; a filling space is formed between each two adjacent steel pipes; the lower section of the filling space between the first layer steel pipe 1 and the second layer steel pipe 2, the lower section of the filling space between the second layer steel pipe 2 and the third layer steel pipe 3 and the inside of the third layer steel pipe 3 are poured with concrete 6; the upper section of the space between the first layer steel pipe 1 and the second layer steel pipe 2 is filled with fine sand 4, and the upper section of the space between the second layer steel pipe 2 and the third layer steel pipe 3 is filled with rubber 5.
Because the hard rock layer is hard, in order to ensure the stability of the multilayer shock absorption pile, the upper ends of the concrete 6 between the first layer steel pipe 1 and the second layer steel pipe 2 and between the second layer steel pipe 2 and the third layer steel pipe 3 are positioned at the junction between the soft soil layer B and the hard rock layer C. After setting, the concrete 6 is integrated with the hard rock layer C to perform a stabilizing function. The construction requirement is that when the rock stratum is subjected to full-strength weathering, each layer of steel pipe is not less than 7m in rock entering, not less than 5m in middle weathering and not less than 2m in micro weathering.
The lower part of the multilayer shock absorption pile for the water measurement platform is concrete, so that the stability is realized, rubber and fine sand are filled at the upper part, the shock absorption effect is realized, materials among all layers of steel pipes in the water layer A are fine sand 4, rubber 5 and concrete 6 in sequence from outside to inside, when the shock absorption pile is beaten by sea waves, the transmission of the rubber 5, the fine sand 4 and the concrete 6 to shock is different, and the shock absorption is realized by utilizing the difference among different materials, and the strength is ensured. The steel pipes are coaxially sleeved, and the distance between every two adjacent steel pipes is 10 cm to 20cm, so that the requirement of shock absorption can be met. The heights of the first layer of steel pipes 1, the second layer of steel pipes 2 and the third layer of steel pipes 3 are sequentially increased, and the height difference between two adjacent steel pipes is 15-20cm.
The invention also discloses a shock-absorbing water measurement platform which comprises the plurality of multilayer shock-absorbing piles and a concrete platform 7, wherein the concrete platform 7 is arranged at the upper parts of the plurality of multilayer shock-absorbing piles. The number of the multi-layer shock absorption piles is 4, and the shock absorption piles are arranged in rows in the transverse direction and in columns in the vertical direction.
The construction method of the multilayer shock absorption pile for the water measurement platform comprises the following steps of: for convenient construction, the construction method from outside to inside is adopted, and the concrete steps are as follows
Drilling holes at the positions to be applied as damping piles, wherein the hole diameter is consistent with the diameter of the first layer of steel pipe 1;
and secondly, vertically placing the first layer of steel pipes 1 in the drilled holes.
And thirdly, pouring super-retarding concrete in the first layer of steel pipes 1 in the second step until the height reaches the junction between the soft soil layer B and the hard rock layer C.
And fourthly, sleeving the second layer of steel pipes 2 in the first layer of steel pipes 1, and enabling the bottoms of the second layer of steel pipes 2 to penetrate through the super-retarding concrete to reach the bottoms of the drilled holes.
Sleeving the third layer of steel pipes 3 in the second layer of steel pipes 2, and enabling the bottoms of the third layer of steel pipes 3 to penetrate through the super-retarding concrete to reach the bottoms of the drill holes;
in the fourth and fifth steps, it is necessary to complete the process before the super-retarding concrete is finally set. In order to ensure that the second layer steel pipe 2 and the third layer steel pipe 3 can pass through the concrete to the bottom of the drilling hole, super-retarding concrete is required to be selected, and the final setting time is not less than 48 hours.
And step six, continuously pouring super-retarding concrete in the third layer of steel pipes 3 until the super-retarding concrete reaches the top of the third layer of steel pipes.
And step seven, filling rubber in the space between the second layer steel pipe 2 and the third layer steel pipe 3 until the space is filled to the top.
And step eight, filling fine sand between the first layer of steel pipes 1 and the second layer of steel pipes 2 until the fine sand is filled to the top.
Step nine, repeating the steps one to eight to finish the construction of other multi-layer shock absorption piles;
and step ten, placing a measuring platform 7 at the top of each multi-layer shock absorption pile. The measuring platform 7 is made of reinforced concrete, and measuring equipment is placed on the measuring platform 7.
The construction engineer tests at a certain engineering section of Guangdong, and the multilayer shock absorption pile in the application is adopted to compare with conventional concrete pile, and the diameter that obtains conventional concrete shock absorption pile needs to set up to 1.5 meters ~ 2 meters, and when adopting the multilayer shock absorption pile in the application, required diameter is 1.4 meters ~ 1.8 meters, can satisfy the absorbing requirement promptly, satisfies the user demand of measuring equipment. Taking a total station as an example of measurement equipment, under the same measurement condition, the test condition in the embodiment is that sea waves exist slightly, the total station is placed on a measurement platform supported by a shock absorption pile which is conventionally designed and constructed and the measurement platform in the invention, after leveling is finished, the measurement is carried out, and the time length of meeting the test condition on the measurement platform in the invention is 3-5 times that on the measurement platform supported by a conventional concrete pile.