CN104074127A - Assembly type hollow slab bridge and construction method thereof - Google Patents

Abstract

The invention discloses an assembled hollow slab bridge and a construction method thereof. The assembled hollow slab bridge includes hollow slabs arranged successively along the transverse direction, two adjacent hollow slabs are connected by I-shaped steel, and the two I-shaped steel Two opposite longitudinal sides of two adjacent hollow plates are snapped into the side slots respectively, the longitudinal sides of the hollow plates are straight sides, and the longitudinally extending sides of the hollow plates are straight faces. The construction method of the assembled hollow slab bridge is to realize the construction method of the hollow slab bridge. The present invention is an assembled hollow slab bridge which can improve the transverse integrity of the hollow slab bridge and enhance the shear force transmission capacity between the hollow slabs and its method of construction.

Description

Prefabricated hollow slab bridge and its construction method

technical field

The invention relates to an assembled hollow slab bridge and a construction method thereof.

Background technique

Prefabricated hollow slab bridges have been widely used in highway construction, especially in small and medium highway bridges with a span of 20m or less. This type of bridge has the characteristics of reliable quality, convenient and fast construction. The construction method is to hoist the prefabricated hollow slabs in place, then pour concrete at the position of the grooved joints between adjacent hollow slabs, pave the bridge deck, and connect each block through the grooved joint steel bars and concrete and bridge deck pavement. The hollow slabs are connected transversely along the bridge to form a whole. The hollow slabs of this type of bridge are constructed in prefabrication plants. The cross-section is usually in the form of single or double holes. The pretensioning method is used for construction. Prestressed tendons are arranged along the longitudinal direction of the slab, and the sides of the hollow slab are broken lines.

This kind of prefabricated hollow-core slab bridge with grooved joints only relies on steel bars and concrete with grooved joints and bridge deck pavement to connect and transmit force between adjacent hollow-core slabs, so the connecting capacity between hollow-core slabs is insufficient, and the integrity of the bridge is poor. Moreover, the size of the grooved joint is generally relatively small, the construction is difficult, and the quality is not easy to be guaranteed, resulting in low concrete strength and easy damage of the grooved joint, resulting in shear failure of the grooved joint. Cracking, forming single-board stress, increasing the deflection of the hollow slab, causing cracks to appear on the bridge deck along the longitudinal direction of the bridge at the position of the tongue and groove, destroying the pavement layer of the bridge deck, causing bumpy driving, thus affecting the normal use and durability of the bridge Sexuality, laying hidden dangers to bridge traffic safety.

Contents of the invention

The object of the present invention is to provide an assembled hollow slab bridge and its construction method which can improve the transverse integrity of the hollow slab bridge and enhance the shear force transfer capability between the hollow slabs.

In order to achieve the above object, the present invention adopts the following technical scheme: Assembled hollow slab bridge, including hollow slabs successively arranged in the horizontal direction, two adjacent hollow slabs are connected by I-shaped steel, and the notches on both sides of the I-shaped steel The two adjacent longitudinal sides of the two adjacent hollow plates are snapped into respectively, the longitudinal sides of the hollow plates are straight sides, and the longitudinally extending sides of the hollow plates are straight faces.

The I-beams between two adjacent hollow plates are arranged at intervals along the longitudinal direction.

The hollow slab is a pre-tensioned fabricated hollow slab.

The construction method of the prefabricated hollow slab bridge includes the following steps: (1) preparing the above-mentioned hollow slab and I-beam, (2) hoisting the hollow slab: transporting the prefabricated hollow slab to the bridge construction site, from Hoist one side to the other side in turn, through the I-beam to connect each hollow plate horizontally into a whole, when hoisting the next hollow plate, first insert the upper and lower flange plates of the notch on one side of the I-beam One longitudinal side of the previous hollow slab has been hoisted, and then the longitudinal side of the next hollow slab is accurately inserted between the upper and lower flanges of the other side of the notch on the other side of the previous hollow slab where the I-beam has been installed. , and so on, until the hoisting of the last hollow slab is completed. After the hoisting of each hollow slab is completed, all the hollow slabs are connected to form a whole. (3) The bridge deck is paved to complete the hollow slab bridge.

The fabricated hollow slab bridge and its construction method according to the present invention have the following beneficial effects:

(1) The upper and lower flanges of the I-shaped steel plates are clamped to the sides of the hollow slabs, and the adjacent hollow slabs are connected as a whole to transmit the shear force. This structure improves the overall integrity of the prefabricated hollow slab bridge along the bridge transverse direction It overcomes the traditional prefabricated hollow slab bridge construction technology that only relies on hollow slab grooved joint concrete and bridge deck pavement to transmit shear force, poor transverse integrity, and easy cracks on the bridge deck along the bridge longitudinal direction at the grooved joint position. Cause the concrete between the hollow slab joints to loosen and fall off, resulting in insufficient lateral connection of the assembled hollow slab bridge, resulting in the disadvantage of single slab stress;

(2) I-shaped steel plates are used to connect and transmit shear force, and the sides of the hollow slabs are made straight, which simplifies the prefabrication and construction process of the hollow slabs in the traditional prefabricated hollow slab bridge construction process, and the sides of the hollow slabs do not need to be reserved Reinforced rebar, no need to pour concrete after hoisting in place;

(3) Since the side of the prefabricated hollow plate is straight, the supporting process of the outer membrane is simplified.

(4) The bridge deck pavement does not need to be changed;

(5) The force transmission path of the steel plate is clear, the structure is simple, the design calculation is mature, and the construction is simple;

(6) The present invention is suitable for prestressed concrete or reinforced concrete assembled hollow slab bridges with various spans.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the I-I view among Fig. 1;

Figure 3 is a schematic structural view of the I-beam.

Detailed ways

Example 1:

The assembled hollow slab bridge shown in Figure 1-3 includes hollow slabs 1 arranged continuously from left to right in the transverse direction, the hollow slabs 1 extend longitudinally from front to back and the hollow slabs 1 are pre-tensioned Assembled hollow plate, the body of the hollow plate 1 is provided with an inner hole 2 extending longitudinally, the longitudinal sides of the hollow plate 1 are straight sides, and all the sides of the hollow plate 1 are straight sides, The longitudinally extending sides of the hollow plate 1 are straight faces, that is, the longitudinally extending sides of the hollow plate 1 are perpendicular to the upper and lower surfaces of the hollow plate 1 . The longitudinal direction is the length direction of the hollow plate 1 , and the transverse direction is the width direction of the hollow plate 1 . Certainly, the application of the present invention is not limited to the above-mentioned form, and two inner holes of each hollow plate 1 may also be provided.

Two adjacent hollow plates 1 are connected by I-shaped steel 4, and I-shaped steel 4 also extends longitudinally from front to back. The upper flange plate 5, the lower flange plate 7 and the web 3, the upper and lower flange plates 5, 7 are parallel, the web 3 is vertically connected between the upper and lower flange plates 5, 7, the web 3 Two U-shaped notches 6 are formed on the left and right sides, and the notches 6 on both sides of the I-shaped steel 4 are respectively snapped into the opposite longitudinal sides of two adjacent hollow plates 1, and the longitudinal sides of the hollow plates 1 are inserted into corresponding working The notch 6 of the beam 4 fits tightly between the upper and lower flange plates 5 and 7 of the I-beam 4, that is, the right side and the right side of the left hollow plate 1 of the two adjacent hollow plates 1 The left side of the hollow plate 1 is opposite, and the right side of the left hollow plate 1 of the two adjacent hollow plates 1 snaps into the left notch 6 of the I-beam 4, and the left side of the right hollow plate 1 snaps into place. into the right side notch 6 of the I-beam 4, and the right side of the left hollow plate 1 is attached to the left side of the web 3 of the I-beam 4, and the left side of the right hollow plate 1 Fitted with the right side plate surface of the web 3 of the I-beam 4. Thus, all the hollow slabs 1 can be successively connected horizontally through the I-beam 4 to form an integral hollow slab bridge. The side is a longitudinally extending side, and the side is a longitudinally extending side. The I-beams 4 between two adjacent hollow slabs 1 are arranged at intervals along the longitudinal direction, so that several I-beams 4 are arranged at intervals along the length of the hollow slab bridge to sequentially connect adjacent hollow slabs 1 to form a Integral hollow slab bridges are arranged at intervals along the longitudinal direction between two adjacent hollow slabs 1 .

Example 2:

The construction method of the prefabricated hollow slab bridge is aimed at the construction method of the prefabricated hollow slab bridge adopting steel plate plug-in connection described in embodiment 1, and it comprises the following steps:

(1) Prepare the hollow plate 1 and the I-beam 4 described in Example 1: process the prefabricated I-beam 4 according to the predetermined size, the height of the web 3 of the I-beam 4 corresponds to the thickness of the hollow plate 1; the hollow plate 1 During fabrication, the structural analysis of the hollow slab bridge is first carried out according to the design parameters such as bridge grade, span, and bridge deck width, and the cross-sectional size, ordinary steel bars and longitudinal prestressed tendons of the hollow slab 1 are calculated and determined, and the shear resistance between adjacent girders and slabs is determined. The design requires calculation and determination of the structural size, steel plate thickness and spacing distance of the I-beam 4. The hollow slab 1 is constructed and manufactured by the pre-tensioning method. The sides are made straight, and after the hollow slab 1 has been maintained for a sufficient number of days, the longitudinal prestressed tendons are stretched first, and the prefabrication of the hollow slab 1 is completed;

(2) Hoisting hollow slabs 1: Transport the prefabricated assembled hollow slabs 1 to the bridge construction site, hoist them in sequence from one side to the other side along the horizontal direction, and connect each hollow slab 1 through the I-beam 4, that is, pass the I-beam The steel plates are connected horizontally to form a whole in turn. The hoisting position of the hollow plate 1 must strictly meet the construction tolerance requirements. Insert one longitudinal side of the previous hoisted hollow slab 1 between the edge plates 5 and 7, and then point the next hollow slab 1 to the longitudinal side of the previous hollow slab 1 (point to the longitudinal side of the previous hollow slab) Accurately insert between the upper and lower flange plates 5 and 7 of the notch 6 on the other side of the I-beam 4 installed on the last hollow plate 1, and so on until the hoisting of the last hollow plate 1 is completed. After the hoisting of the hollow slabs 1 is completed, all the hollow slabs 1 are connected to form an integral hollow slab bridge. There are several I-beams 4 between two adjacent hollow plates 1 arranged at intervals along the longitudinal direction. In this step, the two adjacent hollow plates 1 are connected by the I-shaped steel 4, and the notches 6 on both sides of the I-shaped steel 4 are snapped into the opposite longitudinal sides of the two adjacent hollow plates 1 respectively.

(3) Bridge deck pavement: complete the bridge deck pavement according to the conventional bridge deck pavement method, and complete the hollow slab bridge.

In the assembled hollow slab bridge and its construction method according to the present invention, the side of the prefabricated hollow slab 1 of the assembled hollow slab bridge is made into a straight edge without reserving the traditional tongue-and-groove seam. Steel 4 connects two adjacent hollow slabs 1 to form a whole, and I-beam 4 replaces the traditional grooved concrete to transmit the shear force between the hollow slabs 1. This method lifts the prefabricated hollow slab 1 in the prefabrication field After it is in place, there is no need for rebar connection and concrete pouring of the grooved joint, which simplifies the prefabrication and construction technology of the prefabricated hollow slab 1, and avoids the shortcomings of insufficient lateral integrity caused by the easy damage of the grooved concrete. The transverse shear force between the plates of the slab 1 is transmitted through the plug-in I-beam 4, and the force transmission method of the shear force is clear, which can improve the ability of the hollow slab 1 to transmit the shear force and the integrity along the transverse direction of the bridge, that is, improve The lateral integrity of the assembled hollow slab bridge enhances the shear force transmission capacity between the assembled hollow slabs, improves the lateral connection between the assembled hollow slabs and enhances the integrity of the bridge.

Claims (4)

1. assembling hollow slab bridge, it is characterized in that: comprise the hollowcore slab arranging continuously successively along laterally, between adjacent two hollowcore slabs, connect by i iron, in the both sides notch of i iron, snap in respectively two longitudinal sides that adjacent two hollowcore slabs are relative, longitudinal side of described hollowcore slab is straight flange, and the side of the longitudinal extension of hollowcore slab is for facing directly.

2. assembling hollow slab bridge as claimed in claim 1, is characterized in that: the i iron between adjacent two hollowcore slabs for longitudinally successively interval arrange several.

3. assembling hollow slab bridge as claimed in claim 1, is characterized in that: described hollowcore slab is the assembling hollowcore slab of pre-tensioning system construction.

4. the construction method of assembling hollow slab bridge, it is characterized in that: comprise the steps: hollowcore slab and i iron described in (1) preparation claim 1-3 any one, (2) lifting hollowcore slab: the prefabricated assembling hollowcore slab completing is transported to bridge construction place, along laterally lifting successively from a side direction opposite side, be entirety by each hollowcore slab along laterally joining successively by i iron, while lifting next piece hollowcore slab, should be first upper by i iron one side channel mouth, bottom wing listrium interleaves a longitudinal side that has lifted hollowcore slab into last, then longitudinal side of next piece hollowcore slab is accurately plugged on to lastblock hollowcore slab opposite side notch upper of i iron has been installed, between bottom wing listrium, by that analogy, until last piece hollowcore slab has lifted, after each hollowcore slab has lifted, make all hollowcore slabs be connected to form entirety, (3) deck paving, complete hollow slab bridge.