CN212153084U - Pile-column integrated prefabricated bridge lower part structure - Google Patents

Abstract

The utility model provides a pile-column integrated prefabricated bridge substructure, which comprises a prefabricated capping beam and a prefabricated pipe pile, wherein the bottom of the prefabricated capping beam is provided with a preformed hole and a preformed grouting hole which are mutually communicated; the top of the precast tubular pile is inserted into the preformed hole, and the precast tubular pile and the precast capping beam are connected by corrugated pipe grouting; the bottom of precast tubular pile is inserted and is established to the pre-buried hole that ground was seted up in advance to link firmly through cement mixing soil, precast tubular pile includes two at least segmental tubular piles, and all segmental tubular piles set gradually along its length direction, through connection structure interconnect between the two adjacent segmental tubular piles, the top of precast tubular pile is provided with a plurality of reserved reinforcing bars, and the reserved reinforcing bar links to each other with the main muscle in the precast tubular pile, and the reserved reinforcing bar is located the bellows. The utility model provides a realization assembled bridge substructure construction that bridge substructure can be quick and reduce the place and occupy.

Description

Pile-column integrated prefabricated bridge lower part structure

Technical Field

The utility model relates to an assembled bridge construction field, especially a pile integration prefabrication assembly bridge substructure convenient to bridge quick construction, area are little.

Background

With the development of national economy, the traffic capacity of some existing roads cannot meet the requirement of traffic flow. It is necessary to improve the traffic capacity of the original road, and the reconstruction and the re-extension are two more common ways. The reconstruction is to directly abandon the original road, build a wider or higher-grade road, and the original road can not be utilized, so that the method wastes resources and obviously does not meet the requirement of the current traffic construction in China. The reconstruction and expansion mode can well utilize the advantages of existing roads, small traffic interruption in the construction process and the like, and is widely adopted. However, it is important to reduce the influence of construction on the existing traffic (such as time and place) in the reconstruction and expansion process.

Currently, common bridge infrastructure forms include: pile foundation, cushion cap, pier and bent cap. And for the pile base, the construction is carried out in a cast-in-place mode, then a bearing platform is poured on the pile foundation, and then the pier and the capping beam are cast in place on the bearing platform or a prefabricated bridge and the capping beam are installed. Because the pile foundation is located underground, the construction can only be carried out in a cast-in-place mode. Although a small amount of prefabricated piles are adopted at home and abroad, the prefabricated pile group is adopted, then a bearing platform is cast in place, and the prefabricated pier columns are connected through the bearing platform. The method occupies a large area, and the construction time is prolonged due to the cast-in-place and maintenance of the bearing platform, so that the requirements of bridge reconstruction and expansion projects on time and the field cannot be met. Therefore, the utility model provides a novel stake integration prefabricated assembly bridge substructure.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for a pile-column integrated prefabricated bridge substructure which facilitates rapid construction of a bridge and occupies a small area, so as to rapidly implement the construction of a fabricated bridge substructure and reduce the occupation of a site by the proposed bridge substructure.

In order to achieve the above object, the utility model discloses a technical scheme that bridge substructure adopted is:

a pile-column integrated prefabricated bridge lower part structure comprises a prefabricated cover beam and a prefabricated pipe pile, wherein a preformed hole and a preformed grouting hole which are communicated with each other are formed in the bottom of the prefabricated cover beam; the top of the precast tubular pile is inserted into the preformed hole, and the precast tubular pile and the precast capping beam are connected by corrugated pipe grouting; the bottom of precast tubular pile is inserted and is established to the pre-buried hole that ground was seted up in advance to link firmly through cement stirring soil, precast tubular pile includes two section at least tubular piles, and all section tubular piles set gradually along its length direction, through connection structure interconnect between the two adjacent section tubular piles, precast tubular pile's top is provided with a plurality of reserved reinforcing bars, the main muscle in reserved reinforcing bar and the precast tubular pile links to each other, the reserved reinforcing bar is located the bellows.

Preferably, the quantity of the preformed holes opened at the bottom of the prefabricated bent cap is the same as that of the prefabricated tubular piles, and the positions of the preformed holes opened at the bottom of the prefabricated bent cap correspond to the pre-buried holes opened on the ground in advance.

Preferably, the connecting structure is a flange plate, and the material of the flange plate is Q345.

Preferably, the bottom of precast tubular pile is provided with the bed course, the material of bed course is C50 concrete, and thickness is 30 cm.

Preferably, the number that main muscle set up in the precast tubular pile is the same with the number that reserved reinforcing bar set up, and the one-to-one connection.

Preferably, precast tubular pile is PHC1300, contains 24 HRB400 prestressing force main muscle in it, main muscle diameter is 25mm, adopts C70 high-strength concrete to fill.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model provides a novel pile-column integrated prefabricated bridge substructure, wherein, the piles, the columns and the bent caps are all prefabricated in factory, and a small amount of pouring is carried out only on site without maintenance, thereby saving construction time and ensuring the quality of components in the factory prefabrication; furthermore, the utility model adopts the form of end-bearing pile, and the cement-mixed soil is adopted to fill the periphery of the tubular pile, so that the chamber tightness of the tubular pile and the surrounding soil body is ensured, and the bearing capacity of the tubular pile is greatly improved; in addition, the diameter of the prefabricated tubular pile is large, so that the bearing capacity requirement can be met without adopting a pile group form, a bearing platform structure is not needed, the site construction link can be simplified, and the site occupation can be reduced.

Drawings

Fig. 1 is the utility model discloses the structure schematic diagram of prefabricated assembly bridge substructure of stake integration.

Description of the main elements

In the figure: the prefabricated capping beam comprises a prefabricated capping beam 1, a prefabricated tubular pile 2, a segment tubular pile 21, a connecting structure 22, a ground 3, a pre-buried hole 4, a cushion layer 5 and a corrugated pipe 6.

The following detailed description of the invention will be further described in conjunction with the above-identified drawings.

Detailed Description

Referring to fig. 1, in a preferred embodiment of the present invention, a lower structure of a pile-integrated prefabricated bridge comprises a prefabricated capping beam 1 and a prefabricated tubular pile 2, wherein a preformed hole and a preformed grouting hole which are communicated with each other are formed at the bottom of the prefabricated capping beam 1; the top of the precast tubular pile 2 is inserted into the preformed hole, and the precast tubular pile 2 and the precast capping beam 1 are connected by adopting a corrugated pipe 6 in a grouting manner; . The bottom of precast tubular pile 2 is inserted and is established to ground 3 in the pre-buried hole 4 of seting up in advance to link firmly through cement stirring soil the utility model discloses in, cement stirring soil is the mud of proportion 1.4, and it adds 20% cement and 0.25% expanding agent, customizes in advance through precast tubular pile 2, and later inserts and establish to the pre-buried hole in for the cast-in-place volume is less, need not to safeguard, has saved the engineering time. The precast tubular pile 2 comprises at least two sections of tubular piles 21, all the sections of tubular piles 21 are sequentially arranged along the length direction of the tubular piles, and every two adjacent sections of tubular piles 21 are connected with each other through a connecting structure 22, in the embodiment, the connecting structure 22 is a flange plate, and the flange plate is made of Q345; the form that connects into precast tubular pile through the festival section tubular pile makes the utility model discloses the area that occupies at the scene is little, and convenient prefabrication and conveniently transport to the scene, has simplified the site operation link. The top of precast tubular pile 2 is provided with a plurality of reservation reinforcing bars, and in this embodiment, reinforcing bar length is 1m, the main muscle of reservation reinforcing bar in with precast tubular pile 2 links to each other, the reservation reinforcing bar is located bellows 6. Preferably, the number that the main muscle set up in precast tubular pile 2 is the same with the number that the reservation reinforcing bar set up, and the one-to-one connection.

Preferably, the preformed hole quantity that prefabricated bent cap 1 bottom was seted up is the same with the quantity of precast tubular pile 2, the preformed hole's that prefabricated bent cap 1 bottom was seted up position and the pre-buried hole 4 one-to-one that ground 3 was seted up in advance, for example, two precast tubular piles 2 of 1 installation of a prefabricated bent cap, then the bottom sets up two preformed holes. The bottom of precast tubular pile 2 is provided with bed course 5, the material of bed course 5 is C50 concrete, and thickness is 30 cm. Precast tubular pile 2 is PHC1300, contains 24 HRB400 prestressing force main muscle inside it, main muscle diameter is 25mm, adopts C70 high-strength concrete to fill.

Based on above-mentioned bridge substructure, the utility model provides a match this pile integration prefabricated bridge substructure's construction method, this construction method includes following step:

s1, rotationally digging the pre-buried hole 4 at the designated position on the ground 3 by using a rotary digging machine;

s2, installing a positioning guide frame for piling on the edge of the embedded hole 4, and fixing the positioning guide frame with the ground 3 after the positioning guide frame is accurately positioned;

s3, conveying each section of tubular pile 21 of the precast tubular pile 2 to the hole edge of the pre-buried hole 4;

s4, hoisting the first section of pipe pile 21 into the embedded hole 4 by a crane to expose 2m, and hooping and fixing the part exposed out of the ground 3 by a hoop device;

s5, hoisting the next section of pipe pile 21 by using a crane and aligning the next section of pipe pile 21 with the previous section of pipe pile 21;

s6, mounting a flange plate, and respectively connecting the flange plate with the upper and lower two-section tubular piles 21 through bolt holes at the upper and lower ends of the flange plate; after the bolt is installed, epoxy resin is required to be coated in the range of the connecting part;

s7, hoisting the connected tubular piles through a hoisting machine, loosening the hoop devices, placing the connected tubular piles in proper positions, and installing the hoop devices;

s8, repeating the steps 5-7 until all the section tubular piles 21 of the embedded hole 4 are installed and the prefabricated tubular piles 2 are connected, lifting the connected prefabricated tubular piles 2 by 50cm and hooping;

s9, back-circulating and bottom-cleaning the embedded hole 4 by using slurry to clean soil at the bottom of the embedded hole 4 before the cushion layer is manufactured;

s10, preparing cement stirring soil, and performing reverse circulation; the places for reverse circulation are the interior of the tubular pile and the gap between the outer surface of the tubular pile and the embedded hole 4;

s11, extending the concrete guide pipe into the bottom of the pre-buried hole 4, and pouring cement mixing soil with the diameter of 2 square meters through the concrete guide pipe;

s12, hoisting the connected precast tubular pile 2 by a hoisting machine, loosening the anchor ear, and finely adjusting the plane position, the perpendicularity and the direction of the tubular pile by adopting a positioning guide frame;

s13, placing the lower part of the precast tubular pile 2 to the bottom of the pre-buried hole 4 to complete the integrated construction of the hole pile;

s14, repeating the steps to finish the integrated construction of the rest hole piles;

s15, transporting the precast capping beam 1 to the site, hoisting by using a hoisting machine, putting a preformed hole in the bottom of the precast capping beam 1 and the top of the precast tubular pile 2 downwards after facing each other, inserting the top of the precast tubular pile 2 into the preformed hole, and completing the installation of the precast capping beam 1;

and S16, reserving grouting holes on the prefabricated bent cap 1 for grouting, and finishing the construction of the lower structure of the assembled bridge.

According to the construction method, the piles, the columns and the capping beams are prefabricated in an industrial mode, and only a small amount of pouring is carried out on site, so that maintenance is not needed, the construction time is saved, and meanwhile the quality of the members is guaranteed through the prefabricated in the industrial mode.

If the bridge substructure manufactured by the invention needs pile cutting, the cutting machine is used for cutting off the outer concrete layer of the pipe pile by adopting a circular cutting method, and the inner concrete layer is manually chiseled to complete pile cutting.

The above description is for the detailed description of the preferred possible embodiments of the present invention, but the embodiments are not intended to limit the scope of the present invention, and all equivalent changes or modifications accomplished under the technical spirit suggested by the present invention should fall within the scope of the present invention.

Claims (6)

1. The utility model provides a prefabricated bridge substructure of assembling of stake integration, includes prefabricated bent cap and precast tubular pile, its characterized in that: the bottom of the prefabricated capping beam is provided with a preformed hole and a preformed grouting hole which are communicated with each other; the top of the precast tubular pile is inserted into the preformed hole, and the precast tubular pile and the precast capping beam are connected by corrugated pipe grouting; the bottom of precast tubular pile is inserted and is established to the pre-buried hole that ground was seted up in advance to link firmly through cement stirring soil, precast tubular pile includes two section at least tubular piles, and all section tubular piles set gradually along its length direction, through connection structure interconnect between the two adjacent section tubular piles, precast tubular pile's top is provided with a plurality of reserved reinforcing bars, the main muscle in reserved reinforcing bar and the precast tubular pile links to each other, the reserved reinforcing bar is located the bellows.

2. The pile-column integrated prefabricated bridge substructure of claim 1, wherein: the preformed hole quantity that prefabricated bent cap bottom was seted up is the same with precast tubular pile's quantity, the preformed hole's that prefabricated bent cap bottom was seted up position and the pre-buried hole one-to-one that ground was seted up in advance.

3. The pile-column integrated prefabricated bridge substructure of claim 1, wherein: the connecting structure is a flange plate, and the flange plate is made of Q345.

4. The pile-column integrated prefabricated bridge substructure of claim 1, wherein: the bottom of precast tubular pile is provided with the bed course, the material of bed course is C50 concrete, and thickness is 30 cm.

5. The pile-column integrated prefabricated bridge substructure of claim 1, wherein: the quantity that main muscle set up in the precast tubular pile is the same with the quantity that the reservation reinforcing bar set up, and the one-to-one connection.

6. The pile-column integrated prefabricated bridge substructure of claim 1, wherein: precast tubular pile is PHC1300, and it contains 24 HRB400 prestressing force main muscle inside, main muscle diameter is 25mm, adopts C70 high-strength concrete to fill.

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